JP6995163B2 - Generator motor - Google Patents

Description

The present application relates to a generator motor.

In recent years, there has been an increasing demand for improved fuel efficiency of transportation equipment against the backdrop of global warming. Along with this, there is an urgent need to reduce the size and weight of field winding type generators that supply electric power consumed by vehicle electrical components and charge in-vehicle batteries. However, in recent years, the number of electrical components and the power consumption due to them have been increasing, and vehicle generators are required to have a larger amount of power generation and high efficiency power generation performance. Further, in order to further improve efficiency, a generator motor integrated with a control device has been developed, which integrates a control device having a power conversion function and a sensing function, and realizes an engine assist function and an idling stop function.

In particular, the generator motor has a function as an electric motor for starting and assisting the engine in addition to the power generation function provided by the conventional alternator in order to further improve the fuel efficiency of the automobile. At this time, in order to obtain sufficient output for starting and assisting the engine, the rotational position of the rotor of the generator motor, especially the relative positional relationship between the rotor and the stator, is detected with high accuracy. Is required. Therefore, in order to accurately detect the rotation position of the rotor, a rotation position sensor composed of a detection unit and a detection unit is mounted. Further, the generator motor is provided with a field winding on the rotor in order to accurately control the amount of power generation according to the situation. A slip ring that supplies current to the field winding is mounted on the shaft end of the rotor, and the rotor rotates when the brush rotates in contact with the ring-shaped conductor of the slip ring. Power can be supplied to the field winding even in the state. Since the rotation position sensor and the slip ring member play their respective roles, the detected portion of the rotation position sensor and the slip ring member must rotate in synchronization with the rotor, so that the position is displaced relative to the rotation axis. A structure that prevents slipping is required so that Furthermore, if the detected part of the rotation position sensor and the slip ring are eccentric or have low roundness, the detection accuracy of the rotation position deteriorates or sparks occur between the brush and the slip ring, resulting in parts. It causes a decrease in life. To solve such a problem, a structure for realizing the rotation position detection of the rotating shaft with high accuracy has been proposed.

For example, in Patent Document 1, an electric motor in which a magnet member for a rotation position sensor is mounted on the tip of a rotation shaft and a flat surface portion is provided at a portion where the rotation shaft and the magnet member are fitted, and an electric motor using the same. A power steering device is shown. With this configuration, it is possible to prevent the magnet from idling with respect to the rotating shaft.

Further, Patent Document 2 discloses an alternator for a vehicle provided with a slip ring at the tip of a rotating shaft. In this structure, a structure is shown in which a slip ring is press-fitted and fixed to the end of a rotating shaft to supply electric power to a field winding arranged in a rotor.

Japanese Patent No. 6246325 Japanese Patent No. 2621039

However, in the conventional motor generator shown in Patent Document 1, it is only shown that the magnet member of the rotation position sensor is mounted on the tip end portion of the rotation shaft. Further, in the rotary electric machine described in Patent Document 2, only the slip ring is arranged at the tip of the rotary shaft. The generator motor has both a function as a generator and a function as an electric motor. When operating as a generator, electric power is supplied from the slip ring to the field winding, and the rotor is rotated while being excited to generate electricity. On the other hand, when operating as an electric motor, power is supplied from the slip ring to the field winding to excite the rotor, the position of the rotor's magnetic pole is detected by the rotation position sensor, and the stator corresponds to the position of the magnetic pole. Rotational motion is performed by generating a magnetic field so as to do so.

The power conversion device according to the present application includes a rotor having a field winding provided around a rotating shaft and a rotor.
A stator having a stator winding provided around the rotor, a power conversion device connected to the stator winding to control the rotation of the rotor, and a rotor provided on the rotation shaft. A slip ring that supplies current to the field winding, a magnetic material provided adjacent to the slip ring at the end of the rotary shaft, and a magnetic material provided in the power conversion device facing the magnetic material. A control circuit board having a shaft rotation position detection unit that detects the rotation position of the rotation shaft from a change in magnetic force due to the rotation of the magnetic body, wherein the magnetic body is a sensor provided at an end portion of the rotation shaft. It is embedded in the pedestal and fitted to the mounting hole provided in the sensor pedestal and the outer diameter side of the end of the rotating shaft by a fitting, and the slip ring has a cylindrical shape that covers the circumference of the rotating shaft. A member embedded in the outer diameter side of the resin portion, fitted with an inner diameter side of the resin portion and the outer diameter side of the rotary shaft by a fitting, and a member constituting the sensor pedestal and a member constituting the slip ring. And the linear expansion coefficient is the same .

Further, when Patent Document 1 and Patent Document 2 are combined and used in a generator motor, a method of arranging a detected portion of a rotation position sensor and a slip ring becomes an issue. Further, there is a problem in the combination method and arrangement with the control circuit for supplying electric power to the field winding of the rotor and the power conversion device connected to the stator winding of the stator. It is necessary to devise ways to prevent deterioration of vehicle fuel efficiency and productivity due to cost increase and increase in product weight and size.

This application has been made to solve the above-mentioned conventional problems, and it is possible to detect the rotation position with high accuracy in a space-saving manner, and to obtain the coaxiality with the slip ring that supplies electric power to the field winding. The purpose is to obtain an enhanced generator motor.

The generator motor according to the present application includes a rotor having a field winding provided around a rotating shaft, a stator having a stator winding provided around the rotor, and the stator winding. A power conversion device connected to control the rotation of the rotor, a slip ring provided on the rotary shaft to supply a current to the field winding of the rotor, and a slip ring at the end of the rotary shaft. A magnetic material provided adjacent to the shaft and a shaft rotation position detecting unit provided in the power conversion device facing the magnetic material and detecting the rotation position of the rotation shaft from the change in magnetic force due to the rotation of the magnetic material. It is provided with a control circuit board having a control circuit board.

In the power generation motor of the present application, a magnetic material is provided at the end of the rotating shaft to accurately detect the rotational position of the rotating shaft, and a slip ring that supplies electric power to the field winding detects the rotating shaft. By providing them adjacent to each other, the degree of coaxiality with each other can be increased. Further, by providing the shaft rotation position detection unit on the control circuit board in the power conversion device, it is possible to save space for the entire generator motor.

It is sectional drawing which shows the generator motor which concerns on Embodiment 1. FIG. It is sectional drawing which shows the end of the rotary shaft of the generator motor which concerns on Embodiment 2. FIG. It is sectional drawing in the axial direction of the rotating shaft of the generator motor which concerns on Embodiment 2. FIG. It is sectional drawing in the axial direction of the rotating shaft of the generator motor which concerns on Embodiment 2. FIG. It is sectional drawing which shows the end of the rotary shaft of the generator motor which concerns on Embodiment 3. FIG. It is sectional drawing in the axial direction of the rotating shaft of the generator motor which concerns on Embodiment 3. FIG. It is sectional drawing in the axial direction of the rotating shaft of the generator motor which concerns on Embodiment 3. FIG. It is sectional drawing which shows a part of the generator motor which concerns on Embodiment 4. FIG.

Embodiment 1.
Hereinafter, Embodiment 1 of the present application will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a generator motor according to the first embodiment. The generator motor described in the first embodiment has both the functions of the generator used for the vehicle and the motor. The generator motor 400 is divided into a rotary electric machine unit 200 which is connected to engine power and has a function as a rotary electric machine, and a power conversion device 300 which is connected to an external battery and converts rotational energy and electric power in both directions.

First, the configuration of the rotary electric machine unit 200 will be described. The front bracket 1 as a housing, the rear bracket 2 as a housing, the front bearing 11 fixed to the front bracket 1, the rear bearing 21 fixed to the rear bracket 2, and these front bearings 11 and the rear bearing 21 rotate. A freely supported rotary shaft 3, a rotor 4 having a field iron core 41 and a field winding 42 integrally provided around the rotary shaft 3 with the rotary shaft 3, a front bracket 1 and a rear bracket 2 A stator core 51 and a stator 5 having a stator winding 52, which are sandwiched between the rotors and provided around the rotor 4, are provided. Further, a pulley 6 fixed to the shaft end portion on the front side of the rotating shaft 3 is provided. The generator motor 400 is connected to the rotating shaft (not shown) of the engine via a belt (not shown) hung on the pulley 6.

In the following description, the side where the front bracket is installed is the front side of the generator motor 400, and the side where the rear bracket is installed is the rear side of the generator motor 400 when viewed from the central portion of the rotary shaft 3 in the axial direction. It is called.

Since the temperatures of the rotor 4 and the stator 5 rise due to the heat generated when the generator motor 400 is driven, cooling fans 7 are provided on both end faces in the axial direction of the rotor 4. The front bracket 1 and the rear bracket 2 are manufactured by die-casting aluminum from the viewpoint of weight reduction and productivity. A slip ring portion 8 is mounted on the rear side of the rotating shaft 3, and a pair of slip rings 81 and a resin portion 82 that supports them are provided. A pair of brush holders 91 attached to the rear bracket 2 so as to be located on the outer periphery of the rear side of the rotating shaft 3 and a pair supported by a brush support portion 92 inside the brush holders 91 so as to be in sliding contact with the pair of slip rings 81. The brush 9 is provided. The field current described later is supplied to the field winding via the pair of brushes 9 and the pair of slip rings 81.

On the outside of the rear bracket 2 of the power generation motor 400 in the axial direction, the DC power from the vehicle-mounted battery (not shown) as an external DC power source is converted into AC power, or the AC power from the stator winding 52 is DC. It is provided with a power conversion device 300 for converting into electric power. The power conversion device 300 includes a power circuit unit 310 in which two sets of three-phase AC circuits are configured, a field circuit unit 320 that supplies a field current to the field winding 42 of the rotor 4, and a power circuit unit 310. A control circuit unit 330 for controlling the field circuit unit 320 and the field circuit unit 320 is provided. Further, the power conversion device 300 is composed of a structural member (not shown) that covers or connects these circuits.

The stator winding 52 of the generator motor 400 is composed of, for example, two sets of three-phase stator windings 52 that are out of phase by 30 degrees, and these three-phase stator windings 52 have three-phase power. It is configured so that it can be controlled independently by the power circuit unit 310 provided with two sets of conversion circuits.

The terminals of each phase of the Y-connected three-phase stator winding 52 are connected to the AC side terminals of the power conversion circuit composed of the six power semiconductor elements in the power circuit unit 310. The DC side terminal of the power conversion circuit in the power circuit unit 310 is connected to an in-vehicle battery and a smoothing capacitor. The field circuit unit 320 is connected to the vehicle-mounted battery via two semiconductor elements 321.

When the generator motor 400 is operated as an electric motor, the power semiconductor element is switched and controlled by the control circuit unit 330 so that the power conversion circuit of the power circuit unit 310 operates as an inverter. As a result, the DC power from the vehicle-mounted battery is converted into AC power by the power conversion circuit and supplied to the stator winding 52, and the stator winding 52 generates a rotating magnetic field to generate the field winding 42. The rotor 4 is rotated in cooperation with the DC magnetic field. At this time, the field current flowing through the field winding 42 is adjusted as necessary by the switching control of the semiconductor element 321 by the control circuit unit 330.

On the other hand, when the generator motor 400 is operated as a generator, the semiconductor element 321 is switched and controlled by the control circuit unit 330 so that the power conversion circuit of the power circuit unit 310 operates as a converter. As a result, the AC power generated in the stator winding 52 by the DC magnetic field generated by the field winding 42 of the rotating rotor 4 is converted into DC power by the power conversion circuit and supplied to the vehicle-mounted battery. At this time, the field current flowing through the field winding 42 is adjusted as necessary by the switching control of the semiconductor element 321 by the control circuit unit 330.

In the generator motor 400 shown in FIG. 1, the signal line connection terminal of the power circuit unit 310 is connected to the control circuit provided on the control circuit board 331 of the control circuit unit 330 via a signal line connection member (not shown). It is connected. Further, the AC side terminals of each phase of the power circuit unit 310 are connected to the terminals of each phase of the stator winding 52. The control circuit provided on the control circuit board 331 of the control circuit unit 330 is connected to the lead wire (not shown) from the engine control device (not shown) via the lead wire connection unit (not shown). ..

The control circuit unit 330 includes a resin case (not shown) for accommodating the control circuit board 331 and the control circuit board 331. The case has a waterproof structure sealed by a waterproof cover (not shown) or the like in order to prevent salt and muddy water from entering the control circuit board 331 housed therein. The semiconductor element 321 constituting the field circuit unit 320 is mounted on the same substrate as the control circuit board 331. By mounting the field circuit unit 320 on the control circuit board 331, the power conversion device 300 can be saved in space when the circuits are separately configured.

The generator motor 400 includes a power circuit unit 310 that has both a rectifying function for generated current and a power conversion function such as an inverter. The power semiconductor element constituting the power circuit unit 310 is composed of a switchable power semiconductor element such as a MOS-FET (Metal-Oxide-Semiconductor Field Effect Transistor).

The brush 9 that supplies electric power to the field winding 42 is arranged between the field winding 42 and the stator winding 52 and the control circuit unit 330. Further, the control circuit board 331 is housed in the control circuit unit 330, and the field current is supplied to the brush 9 from the semiconductor element 321 mounted on the control circuit board 331.

The slip ring portion 8 is composed of a slip ring 81 made of conductor metal and a lead portion (not shown), and an insulating resin portion 82 that insulates the rotating shaft 3 and the slip ring 81 and the lead portion. The insulating resin portion 82 is arranged so as to surround the three surfaces of the slip ring 81 other than the radial direction. The resin portion 82 of the slip ring portion 8 has a cylindrical shape, and its inner diameter side is arranged so as to fit on the rotation shaft 3. When the rotating shaft 3 rotates while the brush 9 is pressed against the slip ring 81 of the slip ring portion 8, the brush 9 slides on the surface of the slip ring 81 and is connected to the lead portion of the slip ring portion 8. Power is supplied to the magnetic winding 42. By arranging the insulating resin portion 82 of the slip ring portion 8, it is possible to prevent the electric power from being short-circuited to the rotating shaft 3.

A sensor pedestal 10 having a magnetic body 101 as a detected portion for detecting the shaft rotation position of the rotating shaft 3 is provided at an end portion of the rotating shaft 3. The sensor pedestal 10 is arranged at the end of the rotating shaft 3 on the rear side. Further, the shaft rotation position detection unit 332 is provided on the substrate of the control circuit board 331 of the control circuit unit 330 facing the magnetic body 101 of the sensor pedestal 10, and the rotation shaft 3 is changed from the magnetic force change due to the rotation of the magnetic body 101. Detect the rotation position. The sensor pedestal 10 and the slip ring portion 8 are arranged coaxially with the rotating shaft 3 in this order from the end portion of the rotating shaft 3.

In the generator motor 400 according to the first embodiment, it is necessary to install the sensor pedestal 10 and the slip ring portion 8 on the same axis, and rotate them in synchronization with each other. Further, the sensor pedestal 10 and the slip ring portion 8 must be attached to the rotating shaft 3 so as not to be eccentric, and the coaxiality between the sensor pedestal 10 and the slip ring portion 8 is required. In order to improve the coaxiality, the sensor pedestal 10 and the slip ring portion 8 are provided adjacent to each other on the same rotating shaft 3, and are fitted and fixed to the rotating shaft 3 by a tight fit having a tightening allowance. As a result, idling is prevented and synchronous rotation with the rotor 4 can be continuously operated. Tightening is a fitting method that increases the fixing strength of the fitting between the shaft and the hole. By making the outer diameter of the shaft larger than the inner diameter of the hole that fits it by the tightening allowance, the hole can be fitted. The shaft is press-fitted while deforming its surroundings.

As shown above, the generator motor 400 according to the first embodiment has a rotor 4 having a field winding 42 provided around the rotating shaft 3 and a stator provided around the rotor 4. A stator 5 having a winding 52, a power conversion device 300 connected to the stator winding 52 and capable of controlling the rotation of the rotor 4 on both the generator side and the motor side, and a rotation shaft 3 provided for rotation. A slip ring 81 that supplies an electric current to the field winding 42 of the child 4, a magnetic body 101 provided adjacent to the slip ring 81 at the end of the rotary shaft 3, and a power conversion device 300 facing the magnetic body 101. A control circuit board 331 having a shaft rotation position detection unit 332 that detects the rotation position of the rotation shaft 3 from the change in magnetic force due to the rotation of the magnetic body 101.

Therefore, in the power generator 400 according to the first embodiment, the magnetic body 101 is provided at the end of the rotary shaft 3, the rotation position detection of the rotary shaft 3 is accurately detected, and power is supplied to the field winding 42. By providing the slip ring 81 adjacent to the magnetic body 101 that detects the rotating shaft 3, the degree of coaxiality with each other can be increased. Further, by providing the shaft rotation position detection unit 332 on the control circuit board 331 of the power conversion device 300, the space saving of the entire generator motor 400 can be realized.

Further, the control circuit board 331 is a semiconductor that supplies a current to the field winding 42 of the rotor 4 via a shaft rotation position detection unit 332 that detects the rotation position of the rotation shaft 3 and a brush 9 and a slip ring 81. The element 321 and the element 321 are mounted. In this way, the control circuit board 331, the sensor pedestal 10, and the slip ring portion 8 can be collectively arranged at the end of the rotary shaft 3, and the combination of the power conversion device 300 and the rotary electric machine portion 200 can be compactly realized. be able to.

Further, in order to improve the coaxiality, the sensor pedestal 10 and the slip ring portion 8 are provided adjacent to each other on the same rotating shaft 3, and are fitted and fixed to the rotating shaft 3 by a tight fit having a tightening allowance. The magnetic material 101 at the end of the rotating shaft 3 is embedded in the sensor pedestal 10 provided at the end of the rotating shaft 3, and the mounting hole provided in the sensor pedestal 10 and the outer diameter side of the end of the rotating shaft 3 are It is fitted by a tight fit. Further, the slip ring 81 is embedded in the outer diameter side of the cylindrical resin portion 82 that covers the circumference of the rotation shaft 3, and is fitted to the inner diameter side of the resin portion 82 and the outer diameter side of the rotation shaft 3 by fitting. Has been done. This prevents the magnetic body 101 and the slip ring 81 from idling with respect to the rotation of the rotating shaft 3, and enables continuous operation by synchronous rotation with the rotor 4.

Further, the detected portion for detecting the shaft rotation position of the rotation shaft 3 is composed of a magnetic material 101 having magnetism and a sensor pedestal 10 made of a non-magnetic metal member. The magnetic body 101 is embedded in the sensor pedestal 10, and only the surface with respect to the facing shaft rotation position detection unit 332 is opened, and the periphery thereof is covered with the non-magnetic metal member of the sensor pedestal 10. As a result, the non-magnetic metal member of the sensor pedestal 10 is composed of, for example, a non-magnetic metal such as copper, aluminum, stainless steel and an alloy based on these, and is input to the leakage magnetic flux and the field winding. It is possible to prevent noise due to the pulsation of the current to be superimposed on the magnetic flux of the magnet and to be emitted to the side of the control circuit board 331.

Further, the sensor pedestal 10 is provided so as to be in direct contact with the rotation shaft 3. Since the sensor pedestal 10 is made of a non-magnetic metal member, it can be fixed with much higher strength than when an insulating member such as resin is arranged between them. As a result, even when a large rotational acceleration acts on the sensor pedestal 10, the effect of preventing the positional deviation of the magnetic body 101, which is the detected portion, is improved. In addition, it is possible to prevent the accuracy of detecting the rotation position from being lowered due to the misalignment. Further, the sensor pedestal 10 can directly receive heat conduction from the rotating shaft 3 without interposing an insulating member such as resin. Therefore, the heat generated by the brush 9, the slip ring portion 8, the field winding 42, and the like can be efficiently discharged through the sensor pedestal 10 exposed to the outside air.

Further, a pair of slip rings 81 are provided on the slip ring portion 8. Of these, there is a clearance portion that becomes a gap between the end face of the insulating resin portion 82 embedded in the slip ring 81 on the tip end side of the rotating shaft 3 and the non-magnetic metal member of the sensor pedestal 10, and the clearance that becomes this gap. A part of the rotation shaft 3 is exposed in the portion. This clearance portion can prevent the non-magnetic metal member of the sensor pedestal 10 and the slip ring 81 from being short-circuited. Further, by preventing the pressure input for attaching the sensor pedestal 10 to the end portion of the rotating shaft 3 from being applied as an external force to the insulating resin portion 82, it is possible to prevent the insulating resin portion 82 from being damaged. An insulating spacer may be provided in the clearance portion between the sensor pedestal 10 and the slip ring portion 8.

Embodiment 2.
Next, the generator motor 400 according to the second embodiment will be described with reference to the drawings. FIG. 2 shows a cross-sectional view of the vicinity of the end portion of the rotating shaft 3 cut in the axial direction while leaving the rotating shaft 3. Further, a cross-sectional view taken along the arrow AA shown in FIG. 2 is shown in FIG. 3, and a cross-sectional view taken along the arrow BB is shown in FIG.

FIG. 3 is a cross-sectional view showing a fitting portion between the mounting hole of the sensor pedestal 10 and the rotating shaft 3. The rotating shaft 3 is provided with a flat surface portion 3a which is a plane orthogonal to the radial direction in a part of a portion where the sensor pedestal 10 is fitted. A flat surface portion 10a is formed on the inner diameter side of the mounting hole of the sensor pedestal 10 so as to fit into the flat surface portion 3a. By engaging the flat surface portions 3a and 10a in this way, it is possible to prevent the rotation shaft 3, the sensor pedestal 10, and the magnetic body 101 from slipping.

Further, FIG. 4 is a cross-sectional view showing a fitting portion between the slip ring portion 8 and the rotating shaft 3. In FIG. 4, the rotation shaft 3 is provided with a flat surface portion 3a which is a plane orthogonal to the radial direction at a part of a portion of the slip ring portion 8 that fits with the inner diameter side of the cylindrical resin portion 82. A flat surface portion 82a is formed on the inner diameter side of the cylindrical resin portion 82 of the slip ring portion 8 so as to fit into the flat surface portion 3a. By engaging the flat surface portions 3a and 82a in this way, it is possible to prevent the rotation shaft 3 and the slip ring portion 8 from slipping.

The flat surface portion 10a on the inner diameter side of the mounting hole of the sensor pedestal 10 and the flat surface portion 82a on the inner diameter side of the cylindrical resin portion 82 of the slip ring portion 8 rotate around the flat surface portions 10a and 82a on the inner diameter side. It is also possible to form it by deformation when it is press-fitted into 3. By doing so, it is not necessary to form a flat surface portion in advance on the inner circumferences of the slip ring portion 8 and the sensor pedestal 10, and the processing cost of the component can be reduced. Further, since the flat surfaces can be formed in close contact with each other, the resistance to idling due to impact in the rotational direction and centrifugal force is improved.

In FIG. 2, when the outer diameter of the fitting portion with the sensor pedestal 10 provided at the end of the rotating shaft 3 is Da and the outer diameter of the fitting portion with the slip ring portion 8 is Db. The rotation axis 3 is formed so that the relationship of Da = Db. By forming the rotation shaft 3 in this way, the flat surface portion 3a provided at the fitting portion with the sensor pedestal 10 and the flat surface portion 3a provided at the fitting portion with the slip ring portion 8 are continuously and identically. It can be formed to be a flat surface. The flat surface portion 3a of the rotation shaft 3 can be formed by one processing, and is excellent in productivity and workability. As the processing method, cutting processing, threading processing (including broaching processing), press processing, forging processing, abrasive grain processing and the like can be used.

The slip ring portion 8 is composed of a metal member and a resin member, so that the metal member constituting the slip ring 81 and the non-magnetic metal member constituting the sensor pedestal 10 have the same linear expansion rate. When the temperature of the rotating shaft 3, the slip ring 81, and the sensor pedestal 10 becomes high during operation, the linear expansion coefficient of the non-magnetic metal member of the slip ring 81 or the sensor pedestal 10 is larger than that of the rotating shaft 3, so that the slip ring 81 or the sensor pedestal 10 has a larger linear expansion coefficient. Tightening allowance is reduced. At this time, if there is no tightening allowance due to the expansion of each member, or if a gap is formed in the fitting portion and "roughness" is formed, the detection accuracy of the rotational position of the rotating shaft 3 is lowered. In order to prevent this, if the tightening allowance is increased in advance, when the sensor pedestal 10 and the slip ring portion 8 are press-fitted into the rotating shaft 3, the deformation of these members becomes large, which causes cracking or tearing. By making the linear expansion coefficient of the sensor pedestal 10 and the slip ring 81 the same, the tightening allowance with the rotating shaft 3 can be made the same, and slipping can be prevented while avoiding cracking or tearing during press fitting. ..

Embodiment 3.
Next, the generator motor 400 according to the third embodiment will be described with reference to the drawings. FIG. 5 shows a cross-sectional view of the vicinity of the end portion of the rotating shaft 3 cut in the axial direction while leaving the rotating shaft 3. Further, FIG. 6 shows a cross-sectional view taken along the arrow AA shown in FIG. 5, and FIG. 7 shows a cross-sectional view taken along the arrow BB.

In the present embodiment, the outer peripheral portion of the end portion of the rotating shaft 3 fitted to the inner diameter side of the mounting hole provided in the sensor pedestal 10 and the inner diameter side of the cylindrical resin portion 82 in which the slip ring 81 is embedded. A plurality of streaky protruding portions 3b protruding in the radial direction are provided on the outer peripheral portion of the rotating shaft 3 to be fitted. As shown by the vertical stripes of the rotation shaft 3 in FIG. 5, the protrusion 3b is formed. Further, as shown in the cross-sectional view of the sensor pedestal 10 of the arrow-viewing AA, the protruding portion 3b is formed as shown in FIG. Further, a groove portion 10b is formed on the inner diameter side of the mounting hole of the sensor pedestal 10 so as to fit into the protruding portion 3b. By engaging the protruding portion 3b and the groove portion 10b in this way, it is possible to prevent the rotating shaft 3, the sensor pedestal 10 and the magnetic body 101 from idling.

As shown in FIG. 7, the slip ring portion 8 is also fitted to the protruding portion 3b of the rotation shaft 3 on the inner diameter side of the cylindrical resin portion 82 of the slip ring portion 8 as in the case of the sensor pedestal 10. A groove 82b is formed on the inner diameter side of the resin portion 82 of the above. With such a configuration, when a high torque acts on the generator motor 400 or a high acceleration acts on the rotor 4, a plurality of protrusions 3b are provided to improve the slip prevention effect. Further, when a plurality of protruding portions 3b are provided, the fitting portion per protruding portion 3b can be reduced. Therefore, it is possible to reduce the amount of plastic deformation to the inner diameter portion of the resin portion 82 of the slip ring portion 8 and the inner diameter portion of the mounting hole of the sensor pedestal 10 at the time of fitting by tight fitting. As a result, it is possible to prevent the resin portion 82 of the slip ring portion 8 from cracking or the non-magnetic metal member of the sensor pedestal 10 from cracking. Further, since the amount of deformation is small, it becomes possible to select a member having a larger elastic modulus and Young's modulus for the resin portion 82 of the slip ring portion 8 and the non-magnetic metal member of the sensor pedestal 10, and the fixing strength can be improved. The effect of preventing slipping is improved.

Further, the formation of the groove portion 10b on the inner diameter side of the mounting hole of the sensor pedestal 10 and the groove portion 82b on the inner diameter side of the cylindrical resin portion 82 of the slip ring portion 8 is fitted and input to the rotation shaft 3 having the protrusion 3b. It can be formed by. As a result, it is not necessary to form a groove portion in advance on the inner circumferences of the slip ring portion 8 and the sensor pedestal 10, and the processing cost of the component is reduced. Further, since the flat surfaces can be formed in close contact with each other, the resistance to idling due to impact in the rotational direction and centrifugal force is improved.

Embodiment 4.
Next, the fourth embodiment will be described with reference to the drawings. FIG. 8 is a cross-sectional view showing a part of the generator motor 400 according to the fourth embodiment. The inner ring portion of the rear bearing 21 is fitted and fixed to the rotating shaft 3 by a tight fit with a tightening margin. The outer diameter Ea of the fitting portion of the rotating shaft 3 with the sensor pedestal 10, the outer diameter of the fitting portion of the rotating shaft 3 with the slip ring portion 8 is Eb, and the outer diameter of the fitting portion of the rotating shaft 3 with the rear bearing. When Ec is set to, the rotation shaft 3 is formed in the order of Ea <Eb <Ec. That is, the sensor pedestal 10, the slip ring portion 8, and the rear bearing 21 are arranged adjacent to each other in this order from the shaft end of the rotating shaft 3. In the meantime, the rotation in which the outer diameter dimension Eb of the rotation shaft 3 that fits with the inner diameter side of the cylindrical resin portion 82 in which the slip ring 81 is embedded fits on the inner diameter side of the mounting hole provided in the sensor pedestal 10. It should be larger than the outer diameter dimension Ea at the end of the shaft 3. Further, the outer diameter dimension Ec of the rotary shaft 3 that fits with the inner ring of the rear bearing 21 is from the outer diameter dimension Eb of the rotary shaft 3 that fits with the inner diameter side of the cylindrical resin portion 82 in which the slip ring 81 is embedded. Will also be large.

With this configuration, when assembling the generator motor 400, the rear bearing 21 and the slip ring portion 8 can be press-fitted in order from the shaft end portion of the rotating shaft 3, and the assembly becomes easy. Further, since the diameter of the fitting portion of the rear bearing 21 having a larger load on the fitting portion is increased, the fixing force of the fitting portion is improved.

Further, when the rotor 4 is provided with the cooling fan 7, the outer diameter of the sensor pedestal 10 is Fa, the outer diameter of the slip ring portion 8 is Fb, and the outer diameter of the rear bearing 21 is Fc, Fa <Fb. <Each member is configured to be Fc. That is, the sensor pedestal 10, the slip ring portion 8, and the rear bearing 21 are arranged adjacent to the rotating shaft 3 in this order from the shaft end, and the outer diameter dimension Fa of the sensor pedestal 10 and the outer diameter dimension Fb of the slip ring portion 8 are arranged. The size of the rear bearing 21 is configured to increase in the order of the outer diameter Fc.

As a result, the cooling air is efficiently supplied toward the cooling fan 7 as shown in the air passage Wa in FIG. 8, and the sensor pedestal 10, the slip ring portion 8, and the rear bearing 21 are cooled in this order. This is because the outer diameter portion increases in the order of the sensor pedestal 10, the slip ring portion 8, and the rear bearing 21, so that a wall on one side of the air passage Wa through which the cooling air flows is formed and guided to the cooling fan 7. This is due to the fact that the pressure loss of the air passage Wa is reduced by the arrangement. As a result, the cooling air hits the outer diameter portions of the sensor pedestal 10, the slip ring portion 8, and the rear bearing 21, and heat can be released to the outside by the air passage Wb from the gap of the rear bracket 2.

The shaft rotation position detection unit 332 is provided on the control circuit board 331 installed in the control circuit unit 330. Further, the semiconductor element 321 is mounted on the same control circuit board 331, and the signal wiring for energizing and controlling the semiconductor element 321 by the control circuit unit 330 is composed of the pattern wiring of the control circuit board 331. This circuit controls the current supplied to the field winding 42.
Further, the field current supplied from the semiconductor element 321 is supplied by the slip ring 81 from the brush 9 provided at the end of the rotating shaft 3. By consolidating the wiring to the brush 9 at the shaft end and mounting these circuits on the control circuit board 331 provided at the shaft end, the power conversion device 300 can be saved in space. ..

A part of the power conversion device 300 constitutes a wall on one side of the cooling air passage of the cooling air, and is combined with a wall composed of the sensor pedestal 10, the slip ring portion 8, and the outer diameter portion of the rear bearing 21. , Cooling air passages Wa and Wb are formed. Since the power conversion device 300 can be configured in a space-saving manner, the cross-sectional area of the cooling air passage can be expanded. As a result, the pressure loss in the air passage of the cooling air can be reduced, and the amount of the cooling air can be increased. As a result, in order to configure the generator motor 400, a slip ring portion 8 and a sensor pedestal 10 to be a detected portion of the rotation position sensor are arranged at the end of the rotation shaft 3, and cooling is performed even if the number of components increases. The air volume does not decrease, and the heat dissipation of the generator motor 400 is not lost. Due to the above effects, it is possible to obtain a generator motor 400 that is compact and lightweight, has high productivity, and has high torque output and power generation output efficiency.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Front bracket, 11 Front bearing, 2 Rear bracket, 21 Rear bearing, 3 Rotating shaft, 3a Flat part, 3b Protruding part, 4 Rotor, 41 Field iron core, 42 Field winding, 5 Stator, 51 Stator Iron core, 52 Stator winding, 6 pulley, 7 cooling fan, 8 slip ring part, 81 slip ring, 82 resin part, 82a flat part, 82b groove part, 9 brush, 91 brush holder, 92 brush support part, 10 sensor pedestal 10a flat part, 10b groove part, 101 magnetic material, 200 rotary electric machine part, 300 power conversion device, 310 power circuit part, 320 field circuit part, 321 semiconductor element, 330 control circuit part, 331 control circuit board, 332 axis rotation Position detector, 400 generator motor.

Claims (14)

A rotor with a field winding provided around the axis of rotation,
A stator having a stator winding provided around the rotor, and a stator,
A power conversion device connected to the stator winding and controlling the rotation of the rotor,
A slip ring provided on the rotating shaft and supplying a current to the field winding of the rotor,
A magnetic material provided adjacent to the slip ring at the end of the rotating shaft, and
A control circuit board provided in the power conversion device facing the magnetic body and having a shaft rotation position detecting unit for detecting the rotation position of the rotation shaft from a change in magnetic force due to the rotation of the magnetic body.
Equipped with
The magnetic material is embedded in a sensor pedestal provided at the end of the rotating shaft, and is fitted to the mounting hole provided in the sensor pedestal and the outer diameter side of the end of the rotating shaft by a fitting. ,
The slip ring is embedded in the outer diameter side of a cylindrical resin portion that covers the circumference of the rotation shaft, and is fitted by fitting the inner diameter side of the resin portion and the outer diameter side of the rotation shaft.
A generator motor characterized in that the member constituting the sensor pedestal and the member constituting the slip ring have the same linear expansion coefficient . The control circuit board is equipped with a shaft rotation position detecting unit that detects the rotation position of the rotation shaft, and a semiconductor element that supplies a current to the field winding of the rotor via the slip ring. The power generation motor according to claim 1, wherein the motor is characterized by the above. The slip ring according to claim 1 or 2, wherein the slip ring is embedded in the outer diameter side of the cylindrical resin portion that covers the circumference of the rotation axis so as to surround three surfaces other than the radial direction . The generator motor described. The generator motor according to any one of claims 1 to 3, wherein the sensor pedestal is made of a non-magnetic metal . A claim characterized in that there is a gap between the sensor pedestal provided at the end of the rotating shaft and the resin portion in which the slip ring provided adjacent to the sensor pedestal is embedded. The generator motor according to any one of claims 1 to 4 . The first aspect of the present invention is characterized in that a flat surface portion is provided on the inner diameter side of the mounting hole provided on the sensor pedestal and a part of the outer diameter side of the end portion of the rotating shaft that fits the mounting hole. The generator motor according to any one of claims 5 . A claim characterized by having a flat surface portion on the inner diameter side of the cylindrical resin portion in which the slip ring is embedded and a part of the outer diameter side of the rotating shaft fitted to the inner diameter side of the resin portion. Item 6. The generator motor according to Item 6. The flat surface portion on the outer diameter side of the end portion of the rotation shaft fitted to the inner diameter side of the mounting hole provided on the sensor pedestal, and the inner diameter side of the cylindrical resin portion in which the slip ring is embedded. The power generation motor according to claim 7 , wherein the flat surface portion on the outer diameter side of the rotating shaft to be fitted is continuously coplanar . The outer diameter dimension of the end of the rotating shaft that fits on the inner diameter side of the mounting hole provided on the sensor pedestal and the inner diameter side of the cylindrical resin portion into which the slip ring is embedded. The power generator according to claim 8, wherein the outer diameter of the rotating shaft is the same as the outer diameter . The rotation that fits the outer peripheral portion of the end of the rotating shaft that fits on the inner diameter side of the mounting hole provided in the sensor pedestal and the inner diameter side of the cylindrical resin portion in which the slip ring is embedded. 6 . The generator motor described. The outer diameter of the rotating shaft that fits with the inner diameter side of the cylindrical resin portion in which the slip ring is embedded is the outer diameter of the rotating shaft that fits into the inner diameter side of the mounting hole provided in the sensor pedestal. The generator motor according to any one of claims 1 to 5, wherein the motor is larger than the outer diameter of the end portion . The rotating shaft has a bearing adjacent to the sensor pedestal and the slip ring in this order from the shaft end, and the slip ring is embedded in the outer diameter dimension of the rotating shaft that fits with the inner ring of the bearing. The power generation motor according to claim 11 , wherein the power generation motor is larger than the outer diameter dimension of the rotary shaft fitted to the inner diameter side of the cylindrical resin portion . The rotating shaft has bearings adjacent to the sensor pedestal and the slip ring in this order from the shaft end, and the outer diameter dimension of the sensor pedestal, the outer diameter dimension of the slip ring, and the outer diameter dimension of the bearing are in this order. The generator motor according to any one of claims 1 to 5, wherein the motor is configured to have an increased size . 1 . Item 2. The generator motor according to item 2.

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