JP7167862B2 - sensor unit - Google Patents

Description

The disclosure described in this specification relates to a sensor unit that includes a bus bar connected to a switch module and a magnetoelectric converter that detects current flowing through the bus bar.

As disclosed in Patent Document 1, an inverter device is known that includes a plurality of busbars integrally formed with an insulating member, and a plurality of current sensors provided on the insulating member in a manner facing the plurality of busbars. there is

Japanese Patent No. 6350785

As described above, in Patent Document 1, a plurality of busbars are integrally formed with the insulating member. Therefore, there is a possibility that the positions of the plurality of busbars may be displaced due to vibration or thermal expansion. The relative positional relationship between the current sensor provided on the insulating member and the bus bar may change. The magnetic field passing through the current sensor may fluctuate. As a result, the current detection accuracy of the current sensor may deteriorate.

Therefore, an object of the disclosure described in this specification is to provide a sensor unit in which deterioration in current detection accuracy is suppressed.

One disclosed is a plurality of bus bars (711 to 717) individually connected to each of a plurality of switch modules (312, 322 to 327) constituting part of a power conversion circuit,
an insulating resin case (720) that integrally connects a plurality of busbars in a manner that partially embeds them;
a plurality of magnetoelectric conversion units (731 to 737) that detect the current flowing through the plurality of bus bars by detecting the magnetic field generated by the flow of the current flowing through the plurality of bus bars;
The busbar has higher rigidity than the resin case,
embedded portions (711a to 717a) embedded in the resin case of each of the plurality of busbars are spaced apart in a predetermined direction,
The plurality of magnetoelectric conversion units are provided in the resin case in a manner facing each of the plurality of embedded portions,
A portion of the plurality of embedded sites has an extension site (711b) extending in a predetermined direction, and the extension site is in a twisted position with respect to at least one of the other embedded sites.

This increases the rigidity of the resin case (720) in a predetermined direction. Displacement of the position of each of the plurality of busbars (711 to 717) integrally connected to the resin case (720) in a predetermined direction due to vibration, thermal expansion, or the like is suppressed. A change in the relative positional relationship between the magnetoelectric transducers (731 to 737) provided in the resin case (720) and the busbars (711 to 717) is suppressed. Fluctuations in the magnetic field transmitted through the magnetoelectric converters (731 to 737) are suppressed. As a result, deterioration in current detection accuracy of the magnetoelectric converters (731 to 737) is suppressed.

In addition, an increase in the number of parts is suppressed compared to a configuration in which the rigidity of the resin case (720) is increased by a support member separate from the busbars (711 to 717).

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope in any way.

It is a circuit diagram for explaining an in-vehicle system. It is a schematic diagram for demonstrating a power converter device. It is a top view of a sensor unit. It is a bottom view of a sensor unit. It is a front view of a sensor unit. 5 is a cross-sectional view taken along line VI-VI shown in FIG. 4; FIG. FIG. 5 is a cross-sectional view for explaining a modification of the sensor unit; FIG. 5 is a cross-sectional view for explaining a modification of the sensor unit; It is a schematic diagram for demonstrating the modification of a power converter device. FIG. 5 is a cross-sectional view for explaining a modification of the sensor unit;

Embodiments will be described below with reference to the drawings.

(First embodiment)
<In-vehicle system>
First, an in-vehicle system 100 to which the sensor unit 700 is applied will be described based on FIG. The in-vehicle system 100 constitutes a hybrid system.

In-vehicle system 100 has battery 200 , power converter 300 , and motor 400 . In-vehicle system 100 also has engine 500 and power distribution mechanism 600 . A sensor unit 700 is included in the power conversion device 300 . The motor 400 has a first MG401 and a second MG402. MG is an abbreviation for motor generator.

Furthermore, the in-vehicle system 100 has a plurality of ECUs (not shown). These multiple ECUs transmit and receive signals to and from each other via bus wiring. A plurality of ECUs cooperate to control the hybrid vehicle. Coordinated control of a plurality of ECUs controls the power running and power generation (regeneration) of motor 400 according to the SOC of battery 200, the output of engine 500, and the like. SOC is an abbreviation for state of charge. ECU is an abbreviation for electronic control unit.

The ECU has at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a storage medium for storing programs and data. The ECU is provided by a microcomputer having a computer readable storage medium. The storage medium is a non-transitional tangible storage medium that non-temporarily stores a computer-readable program. A storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. The constituent elements of the in-vehicle system 100 are individually outlined below.

Battery 200 has a plurality of secondary batteries. These secondary batteries constitute a battery stack connected in series. A lithium-ion secondary battery, a nickel-hydrogen secondary battery, an organic radical battery, or the like can be used as the secondary battery.

A secondary battery generates an electromotive voltage through a chemical reaction. A secondary battery has a property that deterioration is accelerated when the amount of charge is too large or too small. In other words, the secondary battery has the property of accelerating deterioration when the SOC is overcharged or overdischarged.

The SOC of battery 200 corresponds to the SOC of the battery stack described above. The SOC of a battery stack is the sum of the SOCs of multiple secondary batteries. Overcharging and overdischarging of the SOC of the battery stack are avoided by the cooperative control described above. On the other hand, overcharging or overdischarging of the SOC of each of the plurality of secondary batteries is avoided by an equalization process that equalizes the SOC of each of the plurality of secondary batteries.

Equalization processing is accomplished by individually charging and discharging a plurality of secondary batteries. The battery 200 is provided with a monitoring section having switches for individually charging and discharging a plurality of secondary batteries. Battery 200 is also provided with a voltage sensor, a temperature sensor, and the like for detecting the SOC of each of the plurality of secondary batteries. One battery ECU among the plurality of ECUs controls the opening and closing of the switch based on the output of these sensors. This equalizes the SOC of each of the plurality of secondary batteries. Note that the output of a current sensor 730, which will be described later, is also utilized for detecting the SOC.

Power converter 300 performs power conversion between battery 200 and first MG 401 . The power converter 300 also performs power conversion between the battery 200 and the second MG 402 . The power conversion device 300 converts the DC power of the battery 200 into AC power having a voltage level suitable for powering the first MG 401 and the second MG 402 . Power conversion device 300 converts AC power generated by power generation by first MG 401 and second MG 402 into DC power having a voltage level suitable for charging battery 200 . The power conversion device 300 will be described in detail later.

First MG 401 , second MG 402 , and engine 500 are each connected to power distribution mechanism 600 . First MG 401 generates power using rotational energy supplied from engine 500 . The AC power generated by this power generation is converted into DC power and stepped down by the power converter 300 . This DC power is supplied to battery 200 . The DC power is also supplied to various electrical loads mounted on the hybrid vehicle.

Second MG 402 is connected to the output shaft of the hybrid vehicle. Rotational energy of the second MG 402 is transmitted to the running wheels via the output shaft. Conversely, the rotational energy of the running wheels is transmitted to second MG 402 via the output shaft.

The second MG 402 is powered by AC power supplied from the power converter 300 . The rotational energy generated by this power running is distributed to the engine 500 and the running wheels by the power distribution mechanism 600 . As a result, cranking of the crankshaft and application of driving force to the running wheels are achieved. Also, the second MG 402 is regenerated by rotational energy transmitted from the running wheels. The AC power generated by this regeneration is converted into DC power and stepped down by the power conversion device 300 . This DC power is supplied to the battery 200 and various electrical loads.

Note that the rated current of the second MG 402 is higher than that of the first MG 401 . More current flows easily through the second MG 402 than through the first MG 401 . The first MG401 corresponds to the first electric motor. Second MG 402 corresponds to the second electric motor.

Engine 500 generates rotational energy by burning fuel. This rotational energy is distributed to first MG 401 and second MG 402 via power distribution mechanism 600 . As a result, the power generation of the first MG 401 and the application of the driving force to the running wheels are achieved.

Power distribution mechanism 600 has a planetary gear mechanism. Power distribution mechanism 600 has a sun gear, planetary gears, a planetary carrier, and a ring gear.

Each of the sun gear and the planetary gear has a disc shape. A plurality of teeth are formed along the circumferential direction on the circumferential surfaces of the sun gear and the planetary gear.

The planetary carrier forms a ring. A plurality of planetary gears are connected to the flat surface of the planetary carrier such that the flat surfaces of the planetary carrier and the planetary gears face each other.

A plurality of planetary gears are positioned on a circumference around the center of rotation of the planetary carrier. Adjacent intervals of these planetary gears are equal. In this embodiment, three planetary gears are arranged at intervals of 120°.

The ring gear forms an annulus. A plurality of teeth are formed side by side in the circumferential direction on each of the outer peripheral surface and the inner peripheral surface of the ring gear.

A sun gear is provided at the center of the ring gear. The outer peripheral surface of the sun gear and the inner peripheral surface of the ring gear face each other. Three planetary gears are provided between them. The teeth of each of the three planetary gears mesh with the teeth of each of the sun gear and ring gear. Thereby, the rotations of the sun gear, the planetary gears, the planetary carrier, and the ring gear can be mutually transmitted.

A motor shaft of the first MG 401 is connected to the sun gear. A crankshaft of engine 500 is connected to the planetary carrier. A motor shaft of the second MG 402 is connected to the ring gear. As a result, the rotational speeds of the first MG 401, the engine 500, and the second MG 402 are linearly related in the collinear chart.

Torque is generated in the sun gear and the ring gear by supplying AC power from the power conversion device 300 to the first MG 401 and the second MG 402 . Torque is generated in the planetary carrier by the combustion drive of the engine 500 . As a result, power generation by the first MG 401, power running and regeneration by the second MG 402, and application of propulsive force to the running wheels are performed.

For example, one of the plurality of ECUs described above, the MGECU, based on physical quantities detected by various sensors mounted on the hybrid vehicle, vehicle information input from other ECUs, and the like, first MG 401 and second MG 402 Determine each target torque. The MGECU performs vector control so that the torque generated in each of the first MG 401 and the second MG 402 becomes the target torque. This MGECU is mounted on a control circuit board which will be described later.

<Circuit Configuration of Power Converter>
Next, the power conversion device 300 will be described. As shown in FIG. 1, the power conversion device 300 includes a converter 310 and an inverter 320 as components of a power conversion circuit. Converter 310 functions to step up or step down the voltage level of DC power. Inverter 320 functions to convert DC power to AC power. Inverter 320 functions to convert AC power to DC power.

Converter 310 boosts the DC power of battery 200 to a voltage level suitable for torque generation of first MG 401 and second MG 402 . Inverter 320 converts this DC power to AC power. This AC power is supplied to the first MG 401 and the second MG 402 . Inverter 320 converts AC power generated by first MG 401 and second MG 402 into DC power. Converter 310 steps down this DC power to a voltage level suitable for charging battery 200 .

As shown in FIG. 1 , converter 310 is electrically connected to battery 200 via positive bus bar 301 and negative bus bar 302 . Converter 310 is electrically connected to inverter 320 via P bus bar 303 and N bus bar 304 .

<Converter>
Converter 310 has a filter capacitor 311, an A-phase switch module 312, and an A-phase reactor 313 as electrical elements.

As shown in FIG. 1 , one end of positive bus bar 301 is connected to the positive electrode of battery 200 . One end of negative bus bar 302 is connected to the negative electrode of battery 200 . One of the two electrodes of filter capacitor 311 is connected to positive bus bar 301 . The other of the two electrodes of filter capacitor 311 is connected to negative bus bar 302 .

One end of A-phase reactor 313 is connected to the other end of positive bus bar 301 . The other end of A-phase reactor 313 is connected to A-phase switch module 312 via first connection bus bar 711 . Thus, the positive electrode of battery 200 and A-phase switch module 312 are electrically connected via A-phase reactor 313 and first connection bus bar 711 . In addition, in FIG. 1, the connection part of various busbars is shown by the white circle. These connecting portions are electrically connected by bolts, welding, or the like.

The A-phase switch module 312 has a high side switch 331 and a low side switch 332 . Also, the A-phase switch module 312 has a high-side diode 331a and a low-side diode 332a. These semiconductor elements are covered and protected by a sealing resin (not shown).

In this embodiment, n-channel IGBTs are used as the high-side switch 331 and the low-side switch 332 . The tips of the terminals connected to the collector electrode, emitter electrode, and gate electrode of the high-side switch 331 and low-side switch 332 are exposed outside the sealing resin.

As shown in FIG. 1, the emitter electrode of the high side switch 331 and the collector electrode of the low side switch 332 are connected. Thereby, the high side switch 331 and the low side switch 332 are connected in series.

A cathode electrode of a high-side diode 331 a is connected to the collector electrode of the high-side switch 331 . The emitter electrode of the high side switch 331 is connected to the anode electrode of the high side diode 331a. As a result, the high side diode 331 a is connected in anti-parallel to the high side switch 331 .

Similarly, the collector electrode of the low-side switch 332 is connected to the cathode electrode of the low-side diode 332a. An emitter electrode of the low-side switch 332 is connected to an anode electrode of a low-side diode 332a. Thus, the low side diode 332 a is connected in anti-parallel to the low side switch 332 .

As described above, the high side switch 331 and the low side switch 332 are covered and protected by the sealing resin. The ends of terminals connected to the collector electrode and gate electrode of the high-side switch 331, the midpoint between the high-side switch 331 and the low-side switch 332, and the emitter electrode and gate electrode of the low-side switch 332 are separated from this sealing resin. exposed. These terminals are hereinafter referred to as collector terminal 330a, midpoint terminal 330c, emitter terminal 330b, and gate terminal 330d.

This collector terminal 330 a is connected to the P bus bar 303 . Emitter terminal 330 b is connected to N bus bar 304 . Thereby, the high side switch 331 and the low side switch 332 are serially connected in order from the P bus bar 303 toward the N bus bar 304 .

Also, the middle point terminal 330 c is connected to the first connection bus bar 711 . First connection bus bar 711 is electrically connected to the positive electrode of battery 200 via A-phase reactor 313 and positive electrode bus bar 301 .

As described above, the DC power of the battery 200 is supplied to the middle point of the two switches included in the A-phase switch module 312 via the positive bus bar 301 , the A-phase reactor 313 , and the first connection bus bar 711 . AC power of motor 400 converted into DC power by inverter 320 is supplied to the collector electrode of high-side switch 331 of A-phase switch module 312 . The AC power of motor 400 converted into DC power is supplied to battery 200 via high side switch 331 , first connection bus bar 711 , A-phase reactor 313 , and positive electrode bus bar 301 .

In this way, the DC power that inputs and outputs the battery 200 flows through the first connection bus bar 711 . To limit the physical quantity that flows, a DC current that inputs and outputs the battery 200 flows through the first connection bus bar 711 .

A gate terminal 330d of each of the high-side switch 331 and the low-side switch 332 is connected to the gate driver. The MGECU generates control signals and outputs them to the gate drivers. The gate driver amplifies the control signal and outputs it to gate terminal 330d. Thereby, the high side switch 331 and the low side switch 332 are controlled to open and close by the MGECU. As a result, the voltage level of the DC power input to converter 310 is stepped up or down.

The MGECU generates pulse signals as control signals. The MGECU adjusts the step-up/step-down level of the DC power by adjusting the on-duty ratio and frequency of this pulse signal. This step-up/down level is determined according to the target torque of motor 400 and the SOC of battery 200 .

When boosting the DC power of the battery 200, the MGECU alternately opens and closes the high side switch 331 and the low side switch 332 respectively. On the contrary, when stepping down the DC power supplied from the inverter 320, the MGECU fixes the control signal output to the low-side switch 332 at low level. At the same time, the MGECU sequentially switches the control signal output to the high-side switch 331 between high level and low level.

<Inverter>
Inverter 320 has a smoothing capacitor 321, a discharge resistor (not shown), and U-phase switch module 322 to Z-phase switch module 327 as electrical elements.

One of the two electrodes of smoothing capacitor 321 is connected to P bus bar 303 . The other of the two electrodes of smoothing capacitor 321 is connected to N bus bar 304 . A discharge resistor is also connected to the P bus bar 303 and the N bus bar 304 . U-phase switch module 322 to Z-phase switch module 327 are also connected to P bus bar 303 and N bus bar 304 . Smoothing capacitor 321 , discharge resistor, and U-phase switch module 322 to Z-phase switch module 327 are connected in parallel between P bus bar 303 and N bus bar 304 .

Each of U-phase switch module 322 to Z-phase switch module 327 has components equivalent to A-phase switch module 312 . That is, each of the U-phase switch module 322 to Z-phase switch module 327 has a high-side switch 331, a low-side switch 332, a high-side diode 331a, a low-side diode 332a, and a sealing resin. Each of these six-phase switch modules also has a collector terminal 330a, an emitter terminal 330b, a midpoint terminal 330c, and a gate terminal 330d.

A collector terminal 330 a of each of these six-phase switch modules is connected to the P bus bar 303 . Emitter terminal 330 b is connected to N bus bar 304 .

A midpoint terminal 330 c of the U-phase switch module 322 is connected to the U-phase stator coil of the first MG 401 via the second connecting bus bar 712 . A midpoint terminal 330 c of the V-phase switch module 323 is connected to the V-phase stator coil of the first MG 401 via the third connecting bus bar 713 . A middle point terminal 330 c of the W-phase switch module 324 is connected to the W-phase stator coil of the first MG 401 via a fourth connecting bus bar 714 .

Similarly, the center point terminal 330 c of the X-phase switch module 325 is connected to the X-phase stator coil of the second MG 402 via the fifth coupling bus bar 715 . A middle point terminal 330 c of the Y-phase switch module 326 is connected to the Y-phase stator coil of the second MG 402 via the sixth coupling bus bar 716 . A midpoint terminal 330 c of the Z-phase switch module 327 is connected to the Z-phase stator coil of the second MG 402 via a seventh coupling busbar 717 .

The gate terminals 330d of each of these six-phase switch modules are connected to the gate drivers described above. When powering each of the first MG 401 and the second MG 402, each of the high-side switch 331 and the low-side switch 332 provided in the six-phase switch module is PWM-controlled by the output of the control signal from the MGECU. As a result, inverter 320 generates a three-phase alternating current. When each of the first MG 401 and the second MG 402 generates (regenerates) power, the MGECU stops outputting the control signal, for example. AC power generated by power generation thereby passes through diodes provided in the six-phase switch module. As a result, AC power is converted to DC power.

The AC power input/output to/from each of first MG 401 and second MG 402 shown above flows through second to seventh connection bus bars 712 to 717 connecting each of first MG 401 and second MG 402 to inverter 320 . In terms of the physical quantities that flow, alternating current power input/output to/from first MG 401 and second MG 402 respectively flows through second connecting bus bar 712 to seventh connecting bus bar 717 .

The types of switch elements provided in each of the A-phase switch module 312 and U-phase switch modules 322 to Z-phase switch modules 327 are not particularly limited, and MOSFETs, for example, may be employed. Semiconductor elements such as switches and diodes included in these switch modules can be manufactured from semiconductors such as Si and wide-gap semiconductors such as SiC. The constituent material of the semiconductor element is not particularly limited.

<Mechanical Configuration of Power Converter>
Next, the mechanical configuration of the power converter 300 will be described. Accordingly, the three directions that are orthogonal to each other are hereinafter referred to as the x-direction, the y-direction, and the z-direction. The x direction corresponds to the predetermined direction.

In addition to the components of the power conversion circuit described above, the power conversion device 300 includes a capacitor case 350, a reactor case 360, a cooler 370, a sensor unit 700, an inverter housing 380, and an input/output connector 390 shown in FIG. have

In addition, in FIG. 2 , the positive bus bar 301 and the negative bus bar 302 are collectively shown as an electrode bus bar 305 . The ends of these two busbars are provided in the input/output connector 390 . A wire harness terminal is connected to the input/output connector 390 . Thereby, the battery 200 and the power conversion device 300 are electrically connected via the wire harness.

In addition, in FIG. 2, the P bus bar 303 and the N bus bar 304 are collectively illustrated as a PN bus bar 306 . These two busbars are stacked in the z-direction via an insulating sheet.

Capacitor case 350 and reactor case 360 are each made of an insulating resin material. A filter capacitor 311 and a smoothing capacitor 321 are housed in a capacitor case 350 . A-phase reactor 313 is accommodated in reactor case 360 .

Cooler 370 houses the switch modules included in converter 310 and inverter 320 . Chiller 370 functions to cool these multiple switch modules. A power module is configured by housing a plurality of switch modules in the cooler 370 .

The sensor unit 700 has a terminal block 720 made of an insulating resin material. A part of the first to seventh connecting bus bars 711 to 717 is insert-molded to the terminal block 720 . The terminal block 720 is provided with a current sensor 730 that detects the current flowing through the plurality of connecting bus bars. The sensor unit 700 will be detailed later.

Inverter housing 380 accommodates capacitor case 350, reactor case 360, cooler 370, sensor unit 700, and input/output connector 390, respectively. Inverter housing 380 also houses electrode busbars 305 and PN busbars 306 .

Although not shown, the inverter housing 380 is connected to motor housings that accommodate the first MG 401 and the second MG 402, respectively. A so-called electromechanical integrated power conversion unit is configured by connecting the power conversion device 300 and the motor 400 .

Although not shown, the inverter housing 380 and the motor housing are connected so as to line up in the z direction. A part of the PN busbar 306 is arranged in a manner facing the cooler 370 housing the plurality of switch modules in the z-direction.

As described above, cooler 370 accommodates a total of seven switch modules included in converter 310 and inverter 320 . These switch modules have a sealing resin, from which the ends of the collector terminal 330a, the emitter terminal 330b, the midpoint terminal 330c, and the gate terminal 330d are exposed. Among these four terminals, collector terminal 330a, emitter terminal 330b, and midpoint terminal 330c each extend in the z-direction toward PN bus bar 306 . Gate terminal 330d extends in the z-direction opposite to these three terminals.

Collector terminal 330 a is welded to P bus bar 303 . Emitter terminal 330b is welded to N bus bar 304 . The center point terminal 330 c is welded to a connecting bus bar included in the sensor unit 700 .

Although not shown, the inverter housing 380 accommodates a driver board including the gate driver and a control circuit board on which the MGECU is mounted. These driver boards and control circuit boards are aligned in the z-direction with the PN bus bar 306 via coolers 370 . A gate terminal 330d is soldered to this driver board. Output pins 723a, which will be described later, are soldered to the control circuit board.

<Sensor unit>
Next, the sensor unit 700 will be described in detail with reference to FIGS. 2 to 6. FIG. The sensor unit 700 has the first to seventh connection bus bars 711 to 717, the terminal block 720, and the current sensor 730 described above. Also, the sensor unit 700 has a shield 740, a resin cover 750, and a counter shield 760 shown in FIG.

Corresponding to the above-described seven connecting bus bars, the current sensor 730 includes first to seventh magnetic-electric conversion units 731 to 737 of the magnetic balance type, and a sensor substrate 738 on which these seven magnetic-electric conversion units are mounted. have. The shielding shield 740 has a first shielding shield 741 to a seventh shielding shield 747 made of a metal material having a magnetic permeability higher than that of the terminal block 720 . The opposing shield 760 has first to seventh opposing shields 761 to 767 made of a metal material having a magnetic permeability higher than that of the resin cover 750 .

Each of the first connecting bus bar 711 to the seventh connecting bus bar 717 is insert-molded in the terminal block 720 . The first to seventh magnetoelectric conversion portions 731 to 737 are provided on the terminal block 720 so as to face the parts of the seven connecting busbars insert-molded into the terminal block 720 in the z-direction.

A first shield 741 to a seventh shield 747 are insert-molded on the terminal block 720 . A first opposing shield 761 to a seventh opposing shield 767 are insert-molded in the resin cover 750 . The resin cover 750 is provided on the terminal block 720 in such a manner that the seven shielding shields and the seven opposing shields are arranged in the z-direction while being spaced apart from each other.

A part insert-molded in the terminal block 720 in one connecting bus bar and one magnetoelectric conversion part are positioned between one shielding shield and one opposing shield aligned in the z-direction. This suppresses the input of external noise to the magnetoelectric conversion section. The distribution of the magnetic field (the magnetic field to be measured) generated from the current flowing through the insert-molded portion of the terminal block 720 in the connecting bus bar is regulated. Variation in the direction of the magnetic field to be measured that passes through the magnetoelectric conversion section is suppressed. The constituent elements of the sensor unit 700 will be individually described below.

<Connected bus bar>
The first connecting bus bar 711 to the seventh connecting bus bar 717 are made of a metallic material such as copper or aluminum having higher rigidity than the terminal block 720 . These seven connecting bus bars are manufactured by pressing a flat metal plate. Center portions of the seven connecting bus bars are insert-molded in the terminal block 720 . Both ends of the seven connecting bus bars are exposed from the terminal block 720 .

One end 710a of each of the first to seventh connection bus bars 711 to 717 exposed from the terminal block 720 is connected to the midpoint terminal 330c of the switch module. A-phase reactor 313 is joined to the other end 710 b of first connection bus bar 711 . A stator bus bar of the motor 400 is joined to the other ends 710b of the second to seventh connection bus bars 712 to 717, respectively. As a result, current flows from the switch module to the stator bus bar via the connecting bus bar. Current flows from the stator busbar to the switch module via the coupling busbar.

<Terminal block>
The terminal block 720 has a base portion 721 , a flange portion 722 and a connector portion 723 when subdivided and described. These base portion 721 , flange portion 722 , and connector portion 723 are integrally connected by a resin material forming terminal block 720 . Terminal block 720 corresponds to the resin case.

The base portion 721 has a substantially rectangular parallelepiped shape with the x direction as the longitudinal direction. Therefore, the base 721 has a left surface 721a and a right surface 721b aligned in the x direction, a front surface 721c and a rear surface 721d aligned in the y direction, and a top surface 721e and a bottom surface 721f aligned in the z direction.

As shown in FIGS. 3 to 5, the flange portion 722 is integrally connected to the left surface 721a and the right surface 721b of the base portion 721, respectively. One of these two flange portions 722 protrudes in the x direction in a manner spaced apart from the left surface 721a. The other of the two flange portions 722 protrudes in the x direction in a manner spaced apart from the right surface 721b.

These two flange portions 722 are insert-molded with metal collars 722a. The collar 722a has an annular shape that is open in the z-direction. A bolt is passed through the hollow of this collar 722a. The tip of this bolt is fastened to the inverter housing 380 . The sensor unit 700 is thereby fixed to the inverter housing 380 .

As shown in FIGS. 4 and 5, the connector portion 723 is integrally connected to the lower surface 721f of the base portion 721. As shown in FIGS. The connector portion 723 extends in the z-direction in a manner separated from the lower surface 721f.

A plurality of output pins 723 a are insert-molded in the connector portion 723 . The output pin 723a extends in the z-direction. One end of the output pin 723 a is exposed from the tip surface 723 b of the connector portion 723 . One end of this output pin 723a is soldered to the control circuit board. The other end of the output pin 723a is exposed from the upper surface 721e of the base 721. As shown in FIG. The other end of this output pin 723 a is soldered to the sensor substrate 738 .

As shown in FIGS. 3 to 5, central portions of the first connecting bus bar 711 to the seventh connecting bus bar 717 are insert-molded in the base portion 721 . One ends 710a of these seven connecting bus bars protrude from the rear surface 721d. These seven ends 710a are spaced apart in the x-direction. From the left surface 721a toward the right surface 721b, a fifth connection bus bar 715, a sixth connection bus bar 716, a seventh connection bus bar 717, a first connection bus bar 711, a second connection bus bar 712, a third connection bus bar 713, and a fourth connection bus bar. Seven one ends 710a are arranged in the order of the busbars 714 .

One end 710a has a flat shape with a thin thickness in the x direction. The connecting surface of the one end 710a facing in the x direction and the middle point terminal 330c are arranged in contact with each other so as to face each other in the x direction. The one end 710a and the midpoint terminal 330c are irradiated with a laser from the z-direction. Thereby, the connection bus bar and the center point terminal 330c are welded.

Central portions of six second to seventh connecting bus bars 712 to 717 of the seven connecting bus bars insert-molded in the base portion 721 extend along the y direction. The other ends 710b of these six connecting bus bars protrude from the front surface 721c. These six other ends 710b are spaced apart in the x-direction. Specifically, from the left surface 721a toward the right surface 721b, the fifth connection bus bar 715, the sixth connection bus bar 716, the seventh connection bus bar 717, the second connection bus bar 712, the third connection bus bar 713, and the fourth connection bus bar 714 The six other ends 710b are arranged in order of .

Each of the other ends 710b of these six connecting bus bars extends in the y-direction away from the front surface 721c, then bends and extends from the lower surface 721f toward the upper surface 721e in the z-direction. A stator bus bar of the motor 400 is bolted to the other end 710b of these six connecting bus bars. As a result, the connection bus bar and the stator bus bar are joined with bolts.

One end 710a side of the central portion of the first connecting bus bar 711 insert-molded in the base portion 721 extends along the y direction in the same manner as the central portions of the second connecting bus bar 712 to the seventh connecting bus bar 717 do. However, as shown in FIG. 6, the central portion of the first connection bus bar 711 extends in the y direction from the rear surface 721d toward the front surface 721c, then bends and extends in the z direction toward the lower surface 721f. The central portion of the first connection bus bar 711 is further bent from there to extend in the x direction toward the left surface 721a, and then bent again to extend in the z direction toward the upper surface 721e. In FIG. 6, in order to explain the shape of the central portion of the first connection bus bar 711, an extended portion 711b of the first connection bus bar 711, which is not normally on the line VI-VI shown in FIG. 4, is shown. ing.

The other end 710b of the first connection bus bar 711 protrudes from the upper surface 721e. The other end 710b of the first connecting bus bar 711 is separated from the other end 710b of the fifth connecting bus bar 715 in the x direction. From left surface 721a to right surface 721b, first connection bus bar 711, fifth connection bus bar 715, sixth connection bus bar 716, seventh connection bus bar 717, second connection bus bar 712, third connection bus bar 713, and fourth connection bus bar Seven other ends 710b are positioned in order of the bus bar 714 . However, the other end 710b of the first connecting bus bar 711 is separated from the other ends 710b of the other six connecting bus bars in the y direction.

As described above, part of the central portion of the first connection bus bar 711 extends in the x direction. The extended portion 711b extending in the x-direction is spaced apart from the central portions of the fifth to seventh connection bus bars 715 to 717 connected to the second MG 402 so as to face each other in the z-direction. In this manner, the extension portion 711b of the first connecting bus bar 711 extending in the x-direction and the central portions of the fifth to seventh connecting bus bars 715 to 717 extending in the y-direction are at twisted positions.

In the following description, in order to simplify the notation, the portions (central portions) of the first to seventh connecting bus bars 711 to 717 that are insert-molded in the terminal block 720 are replaced with the first embedded portions 711a to 711a to the seventh connecting bus bar as necessary. This is shown as embedded site 717a.

As shown in FIGS. 5 and 6, an interlock pin 724 is insert-molded into the base portion 721 . This interlock pin 724 is for determining whether or not a protective cover (not shown) is attached to the sensor unit 700 .

One end of the interlock pin 724 protrudes from the rear surface 721 d of the base portion 721 . A connection pin of the protective cover is connected to this one end. The other end of the interlock pin 724 protrudes from the upper surface 721 e of the base portion 721 . This other end is connected to the sensor substrate 738 . A signal indicating the connection state between the interlock pin 724 and the connection pin is input to the MGECU of the control circuit board via the sensor board 738 and the output pin 723a as a signal indicating the mounting state between the protective cover and the sensor unit.

As shown in FIG. 6, an upper surface 721e of the base 721 is formed with a plurality of recesses 721g that are locally recessed in the z direction. The base 721 is formed with seven recesses 721g. These seven recesses 721g are spaced apart in the x direction. These seven recesses 721g are arranged in a manner facing the first to seventh buried portions 711a to 717a in the z-direction.

A current sensor 730 is provided on the upper surface 721e. The first to seventh magnetoelectric conversion portions 731 to 737 are provided in the hollows of the seven concave portions 721g. A mounting surface 738a of the magnetoelectric conversion portion of the sensor substrate 738 is provided on the upper surface 721e.

A protrusion 721h that protrudes in the z-direction is formed between two recesses 721g that are spaced apart in the x-direction on the upper surface 721e. The sensor substrate 738 is formed with through holes through which the protrusions 721h pass. After the protrusion 721h is passed through the through hole, the tip of the protrusion 721h is thermally caulked. The sensor board 738 is also bolted to the base 721 . The sensor substrate 738 is thereby fixed to the base portion 721 . A relative position of each of the seven magnetoelectric transducers with respect to the seven connecting bus bars is determined.

<Current sensor>
As described above, the current sensor 730 has the first to seventh magnetoelectric converters 731 to 737 . These seven magnetoelectric conversion units have a plurality of magnetoresistive effect elements whose resistance value varies according to the magnetic field (transmission magnetic field) passing through them. The magnetoresistive element changes its resistance value according to the component of the transmitted magnetic field in the direction along the mounting surface 738a. That is, the magnetoresistive element changes its resistance value according to the component along the x-direction and the component along the y-direction of the penetrating magnetic field.

On the other hand, the magnetoresistive element does not change its resistance value due to the transmitted magnetic field along the z direction. Therefore, even if external noise along the z-direction passes through the magnetoresistive element, it does not change the resistance value of the magnetoresistive element.

The magnetoresistive element has a pinned layer whose magnetization direction is fixed, a free layer whose magnetization direction changes according to the transmitted magnetic field, and a non-magnetic intermediate layer provided therebetween. If the intermediate layer is non-conductive, the magnetoresistive element is a giant magnetoresistive element. If the intermediate layer is conductive, the magnetoresistive element is a tunnel magnetoresistive element. The magnetoresistive element may be an anisotropic magnetoresistive element (AMR). Furthermore, the magnetoelectric conversion section may have a Hall element instead of the magnetoresistive effect element.

The magnetoresistive element changes its resistance value depending on the angle formed by the magnetization directions of the pinned layer and the free layer. The magnetization direction of the pinned layer is the direction facing the z-direction. The magnetization direction of the free layer is determined by the component of the transmitted magnetic field along the direction facing the z-direction. The resistance value of the magnetoresistive element is the smallest when the magnetization directions of the free layer and fixed layer are parallel to each other. The resistance value of the magnetoresistive effect element is maximized when the magnetization directions of the free layer and the fixed layer are antiparallel.

Each of the seven magnetoelectric transducers has a bridge circuit including a first magnetoresistive effect element and a second magnetoresistive effect element in which the magnetization direction of the pinned layer is reversed. Also, one of the seven magnetoelectric converters and sensor substrate 738 has a differential amplifier, a feedback coil, and a shunt resistor.

A bridge circuit is connected to the inverting input terminal and the non-inverting input terminal of the differential amplifier. A feedback coil and a shunt resistor are connected in series to the output terminal of the differential amplifier. The differential amplifier is virtual shorted by a feedback circuit (not shown).

Due to the connection configuration described above, a current corresponding to the transmitted magnetic field flows through the input terminals of the differential amplifier. The differential amplifier operates so that the inverting input terminal and the non-inverting input terminal have the same potential. That is, the differential amplifier operates so that the current flowing through the input terminal and the current flowing through the output terminal are zero. Therefore, a current (feedback current) corresponding to the transmitted magnetic field flows from the output terminal of the differential amplifier.

This feedback current flows through the feedback coil and the shunt resistor. This feedback current flow generates a canceling magnetic field in the feedback coil. This canceling magnetic field penetrates the magnetoelectric conversion section. This cancels out the magnetic field to be measured that passes through the magnetoelectric conversion section. As described above, the magnetoelectric conversion unit operates so that the magnetic field to be measured and the canceling magnetic field passing through itself are balanced.

A feedback voltage corresponding to the amount of feedback current that generates the canceling magnetic field is generated at the midpoint between the feedback coil and the shunt resistor. This feedback voltage is input to the MGECU of the control circuit board via the output pin 723a as an electrical signal that detects the current to be measured.

As described above, the first to seventh magnetoelectric conversion units 731 to 737 are mounted on the mounting surface 738a of the sensor substrate 738, respectively. These seven magnetoelectric transducers are spaced apart in the x direction. Specifically, from the left surface 721a to the right surface 721b, the fifth magnetoelectric conversion portion 735, the sixth magnetoelectric conversion portion 736, the seventh magnetoelectric conversion portion 737, the first magnetoelectric conversion portion 731, the second magnetoelectric conversion portion 732, the third A magnetoelectric conversion unit 733 and a fourth magnetoelectric conversion unit 734 are arranged in order.

The fifth to seventh magnetoelectric conversion portions 735 to 737 are arranged opposite to the fifth to seventh embedded portion 715a to the seventh embedded portion 717a in the z direction. Therefore, the magnetic field generated by the alternating current flowing through the second MG 402 penetrates through the fifth to seventh magnetoelectric conversion portions 735 to 737 . The fifth to seventh magnetoelectric converters 735 to 737 detect alternating current flowing through the second MG 402 .

The first magnetoelectric transducer 731 is arranged to face the portion of the first embedded portion 711a extending in the y direction in the z direction. Therefore, the magnetic field generated by the DC current flowing through the converter 310 is transmitted through the first magnetoelectric converter 731 . The first magnetoelectric converter 731 detects a direct current flowing through the converter 310 .

The second to fourth magnetoelectric converters 732 to 734 are arranged to face the second to fourth embedded parts 712a to 714a in the z direction. Therefore, the magnetic field generated by the alternating current flowing through the first MG 401 penetrates through the second to fourth magnetoelectric conversion portions 732 to 734 . The second to fourth magnetoelectric converters 732 to 734 detect AC current flowing through the first MG 401 .

AC currents and DC currents detected by these seven magnetoelectric conversion units are input to the control circuit board. The MGECU provided on the control circuit board vector-controls the motor 400 based on the detected alternating current and the rotation angle of the motor 400 detected by a rotation angle sensor (not shown). The MGECU also outputs the detected direct current to other ECUs such as the battery ECU.

<Shielding shield>
The shielding shield 740 has the first shielding shield 741 to the seventh shielding shield 747 as described above. These seven shields have a flat plate shape with a thin thickness in the z-direction. Seven screening shields are insert molded into base 721 in a spaced apart manner in the x-direction. The seven shields are lined up facing the seven buried sites in the z-direction. A component of the magnetic field in a direction facing the z-direction is positively and easily transmitted through the plurality of shielding shields.

<Resin cover>
The resin cover 750 has a closing portion 751 and a support portion 752 when it is subdivided and explained. The blocking portion 751 and the support portion 752 are integrally connected by the resin material forming the resin cover 750 .

The closing portion 751 has a substantially rectangular parallelepiped shape with the x direction as the longitudinal direction. The closing portion 751 has an inner surface 751a and an outer surface 751b aligned in the z-direction. The resin cover 750 is provided on the upper surface 721e side of the base portion 721 so that the inner surface 751a faces the sensor substrate 738 in the z-direction. Resin cover 750 is fixed to base 721 by bolts 753 .

As shown in FIGS. 5 and 6, the support portion 752 is integrally connected to the outer surface 751b. The support portion 752 extends in the z direction in a manner spaced apart from the outer surface 751b.

A hollow penetrating in the z-direction is formed in each connecting portion of the supporting portion 752 and the blocking portion 751 . The other end 710b of the first connection bus bar 711 projecting from the front surface 721c of the base 721 is inserted into this hollow. The other end 710 b of the first connection bus bar 711 is exposed from the end surface 752 a of the support portion 752 .

A nut 752b opening in the z-direction is insert-molded on the end surface 752a of the support portion 752 . The other end 710b of the first connection bus bar 711 is bent so as to face the nut 752b in the z direction. A bolt is fastened to the nut 752b so that the other end of the A-phase reactor 313 contacts the other end 710b. Thereby, the first connection bus bar 711 and the A-phase reactor 313 are electrically connected.

<Opposing shield>
As described above, the counter shield 760 has the first to seventh counter shields 761 to 767 . These seven opposing shields have a flat plate shape with a thin thickness in the z direction. The seven opposing shields are insert-molded in the resin cover 750 so as to be spaced apart in the x-direction. Components of the magnetic field facing the z-direction are more likely to positively pass through the plurality of opposing shields.

With the resin cover 750 secured to the base 721 by bolts 753, the seven opposing shields are aligned in the z-direction with each of the seven shielding shields. Between the seven opposing shields and the seven shielding shields, seven embedded parts and seven magnetoelectric transducers are positioned.

Specifically, the fifth embedded portion 715a and the fifth magnetoelectric transducer 735 are located between the fifth shield 745 and the fifth opposing shield 765 in the z direction. A sixth embedded portion 716 a and a sixth magnetoelectric conversion portion 736 are located between the sixth shielding shield 746 and the sixth opposing shield 766 . Between the seventh shielding shield 747 and the seventh opposing shield 767, the seventh buried portion 717a and the seventh magnetoelectric transducer 737 are located.

In the z-direction, the portion of the first buried portion 711a extending in the y-direction and the first magnetoelectric transducer 731 are positioned between the first shielding shield 741 and the first opposing shield 761 .

The second embedded portion 712a and the second magnetoelectric transducer 732 are located between the second shield 742 and the second opposing shield 762 in the z direction. A third embedded portion 713 a and a third magnetoelectric conversion portion 733 are located between the third shield 743 and the third opposing shield 763 . A fourth embedded portion 714a and a fourth magnetoelectric transducer 734 are located between the fourth shield 744 and the fourth opposing shield 764. As shown in FIG.

<Effect>
As described above, the insert-molded portions of the second to seventh connecting bus bars 712 to 717 extend in the y direction. That is, the second buried portion 712a to the seventh buried portion 717a extend in the y direction.

On the other hand, part of the portion (first embedded portion 711a) of the first connecting bus bar 711 that is insert-molded in the terminal block 720 extends in the y direction and also extends in the x direction. A portion (extension portion 711b) extending in the x direction in the first embedding portion 711a is at a twisted position with respect to the other embedding portions.

According to this, the rigidity of the terminal block 720 in the x direction is increased by the extension portion 711b. As a result, displacement of the x-direction position of each of the plurality of connecting bus bars integrally connected to the terminal block 720 due to vibration, thermal expansion, or the like is suppressed. A change in the relative positional relationship between the plurality of magnetoelectric conversion units provided on the terminal block 720 and the plurality of connection bus bars is suppressed. Fluctuations in the magnetic field transmitted through the magnetoelectric conversion section are suppressed. As a result, deterioration in current detection accuracy of current sensor 730 is suppressed.

Moreover, an increase in the number of parts is suppressed compared to a configuration in which the rigidity of the terminal block 720 is increased by a supporting member separate from the connecting bus bar.

The x-direction rigidity of the terminal block 720 is increased by the extended portion 711b of the first connection bus bar 711 through which the direct current flows.

According to this, compared to the configuration in which an alternating current flows through the first connection bus bar 711, the magnetic field emitted from the extension part 711b lowers the current detection accuracy of the second to seventh magnetoelectric converters 732 to 737. is suppressed.

As described above, the rated current of the second MG402 is higher than that of the first MG401. Therefore, more current flows through the fifth to seventh connecting bus bars 715 to 717 than through the second to fourth connecting bus bars 712 to 714, respectively. The fifth connecting bus bar 715 to the seventh connecting bus bar 717 are easily thermally expanded. The relative positions of the fifth to seventh connecting bus bars 715 to 717 in the x direction are easily changed.

On the other hand, in the present embodiment, the extension portion 711b is at a twist position relative to each of the fifth embedding portion 715a to the seventh embedding portion 717a. The extended portion 711b of the terminal block 720 increases the rigidity in the x direction, and the fifth to seventh embedded portions 715a to 717a are integrally connected. Therefore, even if the fifth buried portion 715a to the seventh buried portion 717a are likely to thermally expand, their relative positions in the x direction are suppressed from changing.

A first shielding shield 741 to a seventh shielding shield 747 are insert-molded on the terminal block 720 so as to be aligned in the x direction.

As described above, the extension portion 711b increases the rigidity of the terminal block 720 in the x direction. Therefore, displacement of each of the plurality of shields integrally connected to the terminal block 720 in the x direction due to vibration, thermal expansion, or the like is suppressed. A change in the relative positional relationship between the plurality of electromagnetic transducers provided on the terminal block 720 and the plurality of shields is suppressed.

The terminal block 720 is provided with a resin cover 750 insert-molded so that the first to seventh opposing shields 761 to 767 are arranged in the x direction. A magnetoelectric transducer and an embedded portion facing each other in the z-direction are located between one shield and one opposing shield.

According to this, the input of external noise to the magnetoelectric conversion section is suppressed by the shielding shield and the opposing shield. At the same time, the shielding shield and the opposing shield can regulate the distribution of the magnetic field generated by the current flowing through the buried portion.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present disclosure.

(First modification)
In this embodiment, an example is shown in which the extension portion 711b is at twisted positions with respect to the fifth embedding portion 715a to the seventh embedding portion 717a. However, for example, as shown in FIG. 7, the extension portion 711b may be in a twisted position with respect to each of the other second embedding portion 712a to the seventh embedding portion 717a. This effectively suppresses changes in the relative positions of all the buried portions in the x direction.

(Second modification)
In this embodiment, an example in which the inverter 320 has six U-phase switch modules 322 to Z-phase switch modules 327 is shown. However, a configuration in which inverter 320 has three U-phase switch modules 322 to W-phase switch modules 324 can also be adopted. In this case, the sensor unit 700 has four connecting busbars as shown in FIG.

(Third modification)
In this embodiment, an example in which the power conversion device 300 includes the converter 310 and the inverter 320 is shown. However, the power converter 300 may include only the inverter 320 as shown in FIG. 9, for example. In this modification, the sensor unit 700 has three connecting busbars, as shown in FIG. 10, for example.

(Fourth modification)
In this embodiment, one part of the seven embedding sites extends in the x-direction and is twisted with respect to the other embedding sites. However, for example, two of the seven embedding sites may extend in the x-direction and be in a twisted position relative to the other embedding sites. The number of embedded sites partially extending in the x-direction is not limited to one.

(Fifth Modification)
In this embodiment, the shielding shield 740 and the opposing shield 760 each have a flat plate shape with a thin thickness in the z direction. However, the shape of the shield is not particularly limited. For example, each of the shielding shield and the opposing shield may have a flat plate portion with a thin thickness in the z direction and side plate portions extending in the z direction from both ends of the flat plate portion in the x direction. By arranging the front end surfaces of the side plate portions of the shielding shield and the opposing shield to face each other in the z-direction, it is also possible to employ a configuration in which the magnetoelectric transducer and the embedded portion are surrounded by these two shields. Furthermore, a configuration in which the sensor unit 700 has only one of the shielding shield 740 and the opposing shield 760 can also be adopted.

(Other modifications)
Each embodiment has shown an example in which the power conversion device 300 including the sensor unit 700 is applied to the in-vehicle system 100 that constitutes a hybrid system. However, application of the power converter 300 is not particularly limited to the above example. For example, a configuration in which the power conversion device 300 is applied to an in-vehicle system of an electric vehicle can also be adopted.

DESCRIPTION OF SYMBOLS 100... Vehicle-mounted system 200... Battery 300... Power converter 310... Converter 320... Inverter 312... A-phase switch module 322 to 327... U-phase switch module to Z-phase switch module 400... Motor 401... 1st MG 402 2nd MG 500 engine 600 power distribution mechanism 700 sensor unit 711 to 717 first to seventh connection busbars 711a to 717a first to seventh buried portion , 711b... Extension portion 720... Terminal block 731 to 737... First to seventh magnetic/electric conversion parts 741 to 747... First shield to seventh shield 750... Resin cover 761 to 767... 1st facing shield to 7th facing shield

Claims (6)

a plurality of busbars (711 to 717) individually connected to each of a plurality of switch modules (312, 322 to 327) constituting part of the power conversion circuit;
an insulating resin case (720) that integrally connects a plurality of busbars in a manner that partially embeds them;
a plurality of magnetoelectric conversion units (731 to 737) that detect currents flowing through the plurality of busbars by detecting magnetic fields generated by flow of currents flowing through the plurality of busbars;
The bus bar has higher rigidity than the resin case,
embedded portions (711a to 717a) embedded in the resin case of each of the plurality of bus bars are spaced apart in a predetermined direction, and
the plurality of magnetoelectric conversion units are provided in the resin case in a manner facing each of the plurality of embedded portions,
A sensor unit in which a part of the plurality of embedded parts has an extension part (711b) extending in the predetermined direction, and the extension part is at a twisted position with respect to at least one of the other embedded parts. 2. The sensor unit according to claim 1, wherein, of the plurality of bus bars, a direct current flows through the bus bar having the extension portion, and an alternating current flows through the other bus bars. The busbar having the extension portion is electrically connected to a battery, the plurality of busbars at twisted positions with the extension portion are connected to a second electric motor (402), and the other plurality of busbars are connected to the second electric motor (402). 3. Sensor unit according to claim 2, connected to a first motor (401) having a lower rated current than the motor. 3. The sensor unit according to claim 1 or 2, wherein the extension part provided in some of the plurality of embedding parts is at a twisted position with respect to all of the other embedding parts. Any one of claims 1 to 4, comprising a plurality of shielding shields (741 to 747) for suppressing external noise input to each of the plurality of magnetoelectric conversion units, which are embedded in the resin case in a manner aligned in the predetermined direction. The sensor unit described in the paragraph. an insulating resin cover (750) fixed to the resin case;
a plurality of opposing shields (761 to 767) that are embedded in the resin cover in a manner spaced apart in the predetermined direction and suppress input of external noise to each of the plurality of magnetoelectric conversion units;
By fixing the resin cover to the resin case, one of the plurality of magnetoelectric transducers and one of the plurality of embedded portions are connected to one of the plurality of shielding shields and one of the plurality of opposing shields. 6. A sensor unit according to claim 5, located between one of

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