CN1989680B - Brushless DC motor and electric device using the same - Google Patents
Brushless DC motor and electric device using the same Download PDFInfo
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- CN1989680B CN1989680B CN2006800003003A CN200680000300A CN1989680B CN 1989680 B CN1989680 B CN 1989680B CN 2006800003003 A CN2006800003003 A CN 2006800003003A CN 200680000300 A CN200680000300 A CN 200680000300A CN 1989680 B CN1989680 B CN 1989680B
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- mosfet
- motor
- brushless
- gate drivers
- setting section
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
- H03K17/6874—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor in a symmetrical configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/162—Modifications for eliminating interference voltages or currents in field-effect transistor switches without feedback from the output circuit to the control circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0029—Circuits or arrangements for limiting the slope of switching signals, e.g. slew rate
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Brushless Motors (AREA)
- Other Air-Conditioning Systems (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Inverter Devices (AREA)
Abstract
A brush-less DC motor includes a stator assembly having drive-coils for plural phases, a rotor assembly having a permanent magnet, a metal bracket covering a first end of the stator assembly, and a built-in printed wired board (PWB) having a driving circuit for driving the drive coils. The driving circuit includes MOSFETs powering the drive coils, gate drivers controlling the MOSFETs, a pre-driver supplying a PWM signal to the gate drivers, and a setting section setting electrical strength of the MOSFETs. The PWB includes a power module formed by unifying the MOSFETs and the gate drivers with molding resin, the setting section is located at the power module, and the heat is dispersed to the bracket by the power module.
Description
Technical field
The present invention relates to a kind of brushless DC motor with its interior drive circuit (or exciting circuit) of packing into, and a kind of electric device that uses said motor.
Background technology
Shaft power is used for driving the air blast of use at air conditioner and various household electrical appliance at the small-sized brushless DC motor in 20 watts to 50 watts scope.Usually, this motor comprises driver (or exciter), and said driver has various electronic components on its printing distributing board.
Figure 13 has shown the cross sectional view of traditional brushless DC motor 101.Stator molded assembly 103 comprises following parts:
Stator core body 120, this stator core body 120 forms through range upon range of electromagnetic steel plate;
Drive coil (or excitation coil) 121, this drive coil 121 is used for heterogeneous and is wrapped in stator core body 120; With
Unsaturated polyester resin, this unsaturated polyester resin is contained in stator core body 120 and drive coil 121 in the unit together.
First end of stator molded assembly 103 is coated with metal bracket 104.Second end of stator molded assembly 103 and the core of carriage 104 have bearing cage.
Rotor assembly 119 comprises with lower component:
Rotor yoke 118, this rotor yoke 118 forms through range upon range of electromagnetic steel plate;
Multipole permanent magnet 117, this multipole permanent magnet 117 is set to the outer wall of rotor yoke 118, and faces the inwall of stator core body 120, and has to fixed gap between the inwall of multipole permanent magnet 117 and stator core body 120;
Axle 105, this 105 is pressed into the center that is engaged in yoke 118; With
Bearing 114, this bearing 114 is back shaft 105 rotatably.
Printing distributing board (PWB) 113 has the drive circuit of drive coil 121, and printing distributing board 113 is installed on the stator molded assembly 103 rigidly.The end of coil 121 is connected to PWB113 through terminal pin 122.For example mos field effect transistor (MOSFET) array 110, predriver (or pre-driver) 112 is soldered on the PWB113 with the element of a lot of other discrete component (not shown)s, and the magnetic sensor 125 that is used for the magnetic pole of sensing permanent magnet 117 also is soldered to PWB113.Insulation board 115 is placed between PWB113 and the carriage 104, thus PWB113 and carriage 104 insulation.
Figure 14 has shown the plane graph of printed wiring board component (PWB Assy) 107.For example MOSFET array 110, predriver 112, three gate drivers 111 and much the element of other discrete component 131 be installed on the PWB113.Lead assemblies 102 is set to and is used to receive the output of importing and PWB113 being provided on the PWB113.Discrete component 131 comprises resistor and capacitor.
On the other hand; For the electrical strength that improves MOSFET so that increase its reliability; Be necessary the strict various factors of setting; For example voltage change ratio " dV/dt ", drain current rate of change " dI/dt ", the turn on delay time " td " (opening) between drain electrode and the source electrode ends time of delay " td " (pass).For realizing this purpose, for example the discrete component of resistor, capacitor and diode needs 4-6 spare at least at grid place separately, thereby need be from the discrete component of 4 * 6=24 to 6 * 6=36 spare.Auxiliary element except these quantity will make total quantity reach almost 100, thereby the miniaturization of PWB is obstructed.
As switch element, MOSFET is replaced by IGBT, thereby drive circuit is formed by monolithic integrated circuit.This structure is disclosed among the open No.H03-270677 of uncensored Japan Patent.Although this structure allows to make the PWB miniaturization, expectability is not because the raising of the reliability that the distinctive snowslide resistance of MOSFET causes.
Summary of the invention
Brushless DC motor of the present invention comprises with lower component:
Stator module, said stator module have and are used for heterogeneous drive coil (excitation coil);
Rotor assembly, said rotor assembly has permanent magnet;
Metal bracket, said metal bracket are used to cover first end of said stator module; With
Pack into motor and have drive circuit mounted thereto of printing distributing board (PWB), said printing distributing board, said drive circuit is used for driving (or excitation) said drive coil.
Said drive circuit comprises: MOSFET, said MOSFET are used for supplying power to drive coil; Gate drivers, said gate drivers is used to control MOSFET; Predriver, said predriver are used for PWM (pulse width modulation) signal is supplied to gate drivers; And setting section, be used to set the electrical strength of MOSFET.
Said PWB comprises power module; Said power module forms through MOSFET and gate drivers are become one; Setting section is arranged in said power module, said gate drivers and said MOSFET one, and said power module forms heat diffusing to said carriage.
Description of drawings
The structure of discussing above allows to propose a kind of reliable brushless DC motor, and this brushless DC motor has compactness, the in light weight and characteristic that is easy to distribution and installation.The present invention also can provide the electric device that uses this brushless DC motor thus.
Fig. 1 has shown the outward appearance according to the brushless DC motor of first embodiment of the invention;
Fig. 2 has shown the cross sectional view of the motor shown in Fig. 1;
Fig. 3 has shown the circuit diagram of the motor shown in Fig. 1;
Fig. 4 has shown the cross sectional view of the power module of the brushless DC motor shown in Fig. 1;
Fig. 5 has shown the plan view of the printed wiring board component of the motor shown in Fig. 1;
Fig. 6 has shown the circuit diagram that a phase of the motor shown in Fig. 1 is detailed;
Fig. 7 has shown input signal and the time diagram of the relation of output between the signal of the gate drivers of the motor shown in the key diagram 1;
Fig. 8 has shown the time diagram that is described in detail near amplifier section of the time shown in Fig. 7 " t1 ";
Fig. 9 has shown the time diagram of the relation that explanation is similar with the relation shown in Fig. 7, yet the time interval that this time diagram had between time " t2 " and time " t3 " is shorter than the time interval shown in Fig. 7;
Figure 10 has shown the time diagram that the situation when the threshold voltage of MOSFET improves is detailed;
Figure 11 has shown the outward appearance according to the electronic installation of second embodiment of the invention;
Figure 12 has shown the circuit diagram of the electronic installation shown in Figure 11;
Figure 13 has shown the cross sectional view of traditional brushless DC motor; With
Figure 14 has shown the plan view of the printed wiring board component of the traditional brushless DC motor shown in Figure 13.
Embodiment
Hereinafter will be with reference to description of drawings example embodiment of the present invention.
Fig. 1 has shown the outward appearance according to the brushless DC motor of first embodiment of the invention.Spindle drive motor assembly 3 is coated with the carriage 4 that covers shape, and axle 5 extends through carriage 4.Lead assemblies 2 is extended from the side (or athwartship plane) of stator molded assembly 3.
Fig. 2 has shown the cross sectional view according to the brushless DC motor of first embodiment.Stator molded assembly 3 comprises with lower component:
Unsaturated polyester resin, this unsaturated polyester resin is enclosed in stator core body 20 and drive coil 21 in the unit together.
First end of stator molded assembly 3 is coated with metal bracket 4.Second end of stator molded assembly 3 and the core of carriage 4 have bearing cage.
Multipole permanent magnet 17, this multipole permanent magnet 17 is set to the outer wall of rotor yoke 18, and faces the inwall of stator core body 20, and has to fixed gap between the inwall of multipole permanent magnet 17 and stator core body 20;
Axle 5, this 5 is pressed into the center that is engaged in yoke 18; With
Bearing 14, this bearing 14 is back shaft 5 rotatably.
Printing distributing board (PWB) 13 has the drive circuit of drive coil 21, and printing distributing board 13 is installed on the stator molded assembly 3 rigidly.The end of coil 21 is connected to PWB13 through terminal pin 22.For example MOSFET array 10, predriver (or pre-driver) 12 is soldered on the PWB13 with the element of a lot of other discrete component (not shown)s, and the magnetic sensor 25 that is used for the magnetic pole of sensing permanent magnet 17 also is soldered to PWB13.Insulation board 15 is placed between PWB13 and the carriage 4, thus PWB13 and carriage 4 insulation.
The power module 10 that is installed on the PWB13 is dispersed into heat on the carriage 4 through high-termal conductivity resin 16, and said high-termal conductivity resin 16 adopts the good silicone of thermal conductivity.Because silicone is flexible, so it can absorb the skew (dispersion) in space between power module 10 and the carriage 4.
Fig. 3 has shown the circuit diagram according to the brushless DC motor of first embodiment.Voltage below drive circuit 6 receives: supply with High Level DC Voltage Vdc, come the control voltage vcc of Self Control power supply 23 and the control signal voltage Vsp of speed control signal 24 from high-voltage DC power supply 9.Drive circuit 6 outputs will be used to the motor rotating signal FG of speed control.
Three magnetic sensors 25, these three magnetic sensors 25 are used for the position of magnetic pole of sensing rotor;
Predriver 12, this predriver 12 are used to receive from the signal of magnetic sensor 25 and produce pwm signal;
The signal that three gate drivers 11, these three gate drivers 11 are used to receive from predriver 12 also produces the control signal that is used for MOSFET 8; With
Six MOSFET 8, these six MOSFET 8 connect with three phase bridge.Magnetic sensor 25 adopts Hall (Hall) element or Hall (Hall) integrated circuit (IC) usually.Output current is by current sense resistor 26 sensings, and is fed back to predriver 12.
Three gate drivers 11 and six MOSFET 8 unifications (or integrated) are in a unit, thus formation power module 10.Fig. 4 has shown the cross sectional view of this power module 10.Gate drivers 11 is welded on the framework 28 with MOSFET 8 rigidly, and bonding wire 30 is connected to MOSFET 8 with gate drivers 11, and the electrode 27 that will go between is connected on these two elements.All these elements are molded as a unit with epoxy resin 29.
Fig. 5 has shown the plan view of printing distributing board (PWB) assembly 7.Power module 10, predriver 12 and discrete component 31 are installed on the PWB13, and PWB13 also comprises lead assemblies 2, and lead assemblies 2 is used to receive the output of importing and PWB13 being provided.Discrete component 31 comprises resistor, capacitor etc.
Fig. 6 has shown the part according to the circuit diagram of the brushless DC motor of first embodiment, and this figure has detailed the phase of the entire circuit figure shown in Fig. 3.In fact MOSFET 8 shown in Fig. 3 is formed by the MOSFET Q1 that connects with MOSFET Q2, and receives High Level DC Voltage Vdc.MOSFET Q1 comprises the sustained diode 1 and grid capacitor C1 as passive component.MOSFET Q2 also comprises the sustained diode 2 and grid capacitor C2 as passive component.
Fig. 7 has shown that explanation input signal HIN, LIN export time (regularly) figure of the relation between signal HO, the LO in advance.In the time period of " t "＜t1, input signal HIN and LIN rest on low level, thereby break off and connect at switch SW 2, the SW4 of downside at the output electronic switch SW1 of upside, SW3.Export signal HO, LO thus and all remain on low level, and MOSFET Q1, MOSFET Q2 rest on cut-off state.
Next, when " t "=t1, input signal HIN is elevated to high level, and input signal LIN remains on low level.Switch SW 1 is connected thus, and switch SW 2 is broken off.Output signal HO is elevated to high level conducting MOSFET Q1.MOSFET Q2 remains on cut-off state.At this moment, the stored charge in guiding (boot) capacitor C3 supplies to the grid of MOSFET Q1 through resistance R 1, and exports signal HO with regular hour constant rising.MOSFET Q1 rests on cut-off state and reaches the threshold voltage Vth of MOSFET Q1 up to output signal HO, and when " t "=t10, promptly when signal HO reaches voltage Vth, and MOSFET Q1 conducting, this impels to drive coil 21 supply High Level DC Voltage Vdc.
Next, when " t "=t2, input signal HIN drops to low level, and output signal LIN remains on low level.Switch SW 1 is disconnected thus, and switch SW 2 connections, and output signal HO constant decline in time, and this time constant is confirmed by the grid capacitor C1 of resistor R 2 and MOSFET Q1.MOSFET Q1 rests on conducting (ON) state and becomes the threshold voltage Vth that is lower than MOSFET Q1 up to output signal HO, and becomes when being lower than threshold voltage as output signal HO, and promptly when " t "=t20, MOSFETQ1 becomes and ends (OFF) state.
When " t "=t3, input signal HIN remains on low level, and input signal LIN is elevated to high level, thus switch SW 3 connect, and switch SW 4 is broken off.Output signal LO raises with the time constant of being confirmed by capacitor C2 and resistor 3.MOSFET Q2 rests on cut-off state and reaches the threshold voltage Vth of MOSFET Q2 up to output signal LO, and when " t "=t30, promptly when signal LO reaches voltage Vth, and MOSFET Q2 conducting.
When " t "=t4, input signal HIN remains on low level, and input signal LIN drops to low level.Switch SW 3 is broken off thus, and switch SW 4 is connected.Output signal LO descends with the time constant of being confirmed by grid capacitor C2 and the resistor 4 of MOSFET Q2.MOSFET Q2 rests on conducting state and becomes up to output signal LO and be lower than the threshold voltage Vth of MOSFET Q2, and when " t "=t40, promptly becomes when being lower than voltage Vth as signal LO, and MOSFET Q2 ends (that is disconnection).
Then, when " t "=t5, this state becomes and the equal state that when " t "=t2, occurs, and the order of the state of top discussion is repeated.
Fig. 8 has amplified the part of the t1 shown in Fig. 7, and has shown the variation of the terminal voltage VU of drive coil in addition.As " t "=t1; Input signal HIN is when low level changes to high level; Afterwards, output signal HO begins to raise at " t "=t11 place in transmission (or transfer) time of hysteresis comparator HS1, level shift circuit LS1 and output electronic switch SW1 (omitted among Fig. 7 should delivery time).
Export signal HO then and reach threshold voltage Vth, and MOSFET Q1 conducting; Yet in fact, in MOSFET Q1 changes to conducting state from cut-off state change-over time during the section, signal HO is almost constant at the voltage place of about threshold voltage Vth.Because MOSFET Q1 has changed the voltage between its drain electrode and the source electrode from the state exchange by the end of conducting, thereby the grid capacitor C1 of Q1 becomes significantly much bigger (mirror effect).In more detail, when " t "=t12, output signal HO reaches threshold voltage Vth, and MOSFET Q1 begins conducting, and the terminal voltage of drive coil begins to raise.During voltage VU raise, signal HO was because mirror effect is almost constant.When " t "=t13, voltage VU reaches about High Level DC Voltage Vdc, and signal HO begins further rising because mirror effect no longer works.At this moment, become bigger in the shorter time of the rate of change of voltage VU " dV/dt " between t12 and t13.
The rate of change of voltage VU " dV/dt " is by confirming based on the time constant of the feedback capacity between the grid of resistor R 1 and MOSFET Q1 and the drain electrode, thereby rate of change " dV/dt " can be set with feedback capacity through adjustment resistor R 1.Usually, rate of change " dV/dt " is set by the value of the resistor R that can be easy to adjust 1.For example, be equipped with at household electrical appliance under the situation of motor, resistor R 1 is adjusted to rate of change " dV/dt " and becomes about 2kV/ μ sec.
The description of front should be mentioned that the state of MOSFET Q1 is from ending the situation that is transformed into conducting; Yet, when the state of MOSFET Q1 from conducting be transformed into by the time, can set the rate of change " dV/dt " of the terminal voltage VU of drive coil, promptly the rate of change " dV/dt " under this situation can be set through adjustment resistor R 2.
Can make the setting similar to MOSFET Q2 with the situation of top discussion; Be Q2 from can setting through adjustment resistor R 3, and Q2 is transformed into " dV/dt " that end from conducting and can set through adjustment resistor R 4 by " dV/dt " that be transformed into conducting.
As discussed above, resistor R 1, R2, R3, R4 are as setting section, and this setting section is used to set the drain electrode of MOSFET Q1 and MOSFET Q2 and the rate of change of the voltage between the source electrode.Electric current " dI/dt " is next described below.
In Fig. 8, when voltage VU changes, can observe MOSFET Q1 from rate of change by the end of the drain current " dI/dt " of the state exchange of conducting.During voltage VU changed, because mirror effect plays like effect previously discussed, signal HO was almost constant around the threshold voltage Vth of MOSFET Q1; Yet in fact it changes a little.At the change a little of threshold voltage Vth rate of change on every side and the mutual conductance of MOSFET Q1, confirmed the rate of change of the drain current " dI/dt " of MOSFET Q1.Changing a little of the rate of change of signal HO around threshold voltage Vth can be confirmed by the grid of resistance R 1 or MOSFETQ1 and the capacitor C1 between the source electrode.In other words, the adjustment of the mutual conductance of resistance R 1 or MOSFET Q1 can be set the rate of change of the drain current " dI/dt " of MOSFET Q1.Yet, because resistor R 1 is used for the rate of change of setting voltage " dV/dt ", so capacitor C1 or mutual conductance are used to set the rate of change of drain current " dI/dt ".
The description of front should be mentioned that the state of MOSFET Q1 is from ending the situation that is transformed into conducting; Yet, when the state of MOSFET Q1 from conducting be transformed into by the time, can set the rate of change " dI/dt " of drain current, promptly the rate of change " dV/dt " under this situation can be set through adjustment capacitor C1 or mutual conductance.
Can make the setting similar with the situation of top discussion to MOSFET Q2, promptly Q2 " dI/dt " can set through capacitor C2 and the mutual conductance of adjustment MOSFET Q2.
As discussed above, capacitor C1, the C2 of MOSFET Q1 or MOSFET Q2, or mutual conductance can be used as setting section, this setting section are used to set the rate of change " dI/dt " of the drain current of MOSFET Q1 or MOSFET Q2.
Fig. 9 has explained how motor moves when t2 approaches t3 in the circuit shown in Fig. 6.More specifically, input signal HIN is transformed into low level at " t "=t2 place from high level, and input signal LIN at " t "=t3 place from the low transition to the high level.Fig. 9 has shown the operation when t2 approaches t3 thus, and promptly when output voltage LO begins to rise, output signal HO begins decline at " t "=t2 place, and remains at " t "=t3 place and to be higher than threshold voltage Vth.In this case, if MOSFET Q2 conducting before MOSFETQ1 ends, circulating current flow to Q2 from Q1 so, thereby damages these MOSFET.
For preventing flowing of this circulating current, as the resistor R 1 of setting section and the relation between the R2 should be adjusted in advance R1＞＞R2, thereby " t "=t20 can appear at before " t "=t30.
The time interval between " t "=t2 (this moment, input signal HIN changed to low level from high level) and " the t "=t3 (this moment, input signal LIN changed to high level from low level) is commonly referred to idle time (or dead time).With respect to usually gate drivers 11, MOSFET8 and near time of delay of taking place in the element, prepared this idle time long enough.Yet drive coil can not encouraged under the very long situation because continue in idle time, uses motor (its shaft power is in 20 watts to 50 watts scope) in the fan of household electrical appliance to cause the for example trouble of noise and vibration sometimes.Should be minimized this idle time thus, thereby should shift to an earlier date the value of the electric capacity of conscientiously studying resistor R 1, R2 and grid capacitor.
Figure 10 has explained the operation when Vth1 brings up to Vth2 as the threshold voltage Vth of MOSFET Q1 itself.In this case, MOSFET Q1 becomes shorter from being conducting to the time of delay that ends, and MOSFETQ2 becomes longer from the time of delay by the end of conducting.Said preparation allows to propose a kind of brushless DC motor; The utmost point is in short-term in the circuit diagram shown in Fig. 6 even this brushless DC motor is when idle time; Promptly when " t "=t2 (at " t "=t2 time input signal HIN change to low level from high level) approaches " t "=t3 (at " t "=t3 time input signal LIN change to high level from low level), do not worry yet MOSFET Q1 by before MOSFET Q2 conducting.
As discussed above, brushless DC motor of the present invention comprises power module, this power module through will be at least by moulded resin MOSFET and gate drivers be integrated into a unit and form; With the drive circuit that comprises power module.The setting section among power module, gate drivers or the MOSFET one of packing into can be set the electrical strength of MOSFET.Aforementioned structure allow to obtain reliable brushless DC motor, and this brushless DC motor has compactness, in light weight and be easy to the characteristic that connects up and install.
Below with reference to Figure 11 and the 12 explanations electric device with brushless DC motor of the present invention.Figure 11 has shown the structure of the electric device (outdoor unit of air conditioner) according to second embodiment of the invention.
In Figure 11, the division board 54 that is stood on the base plate 52 according to the outdoor unit 51 of second embodiment of the invention is divided into compressor room 56 and heat exchanger chamber 59.Compressor 55 is placed in the chamber 56.Heat exchanger 57 is placed in the chamber 59 with blower motor 58.The box 60 that carries electronic component is placed on the division board 54.
Fan motor 58 is by the brushless DC motor 1 of explanation among the embodiment 1, and the air blast that is installed on the motor rotary shaft forms, and fan motor 58 has been supplied to from High Level DC Voltage Vdc that is contained in the power supply 53 in the box 60 and control voltage vcc.The rotation of fan motor 58 causes the air blast rotation, and this has produced the wind that is used for cooling heat exchanger chamber 59.Like what discussed among the embodiment 1, because brushless DC motor comprises the drive circuit of packing in it, motor 1 is compact dimensionally and be easy to wiring and install, thus 1 pair on motor for example the improving of electric device of air conditioner reduce useful with cost.
Figure 12 has shown the ball bearing made using figure of the electric device (outdoor unit of air conditioner) according to second embodiment of the invention.In Figure 12, source power supply 62 is to power supply 53 power supplies, and power supply 53 comprises rectifier, smmothing capacitor, Switching Power Supply and other element.Power supply 53 is to fan motor 58 output High Level DC Voltage Vdc and control voltage vcc.High Level DC Voltage Vdc also supplies to the inverter 61 that is used for Driven Compressor 55.
Switching on and off of inverter 61 causes stack surge current (not shown) on High Level DC Voltage Vdc, thereby voltage possibly exceed the proof voltage of the MOSFET in the fan motor 58 of packing into.Yet MOSFET itself has snowslide resistance, and this snowslide resistance is even as big as standing the overvoltage in the short time, thereby MOSFET can not break down.Can realize reliable fan motor thus.
In this second embodiment, the outdoor unit of air conditioner is as the example of electric device; But the present invention can be applied to air blast and the indoor unit itself of use in the indoor unit of air conditioner, and has the advantage similar with the advantage of outdoor unit.
Applicability in the industry
Brushless DC motor of the present invention comprises stator module, and this stator module comprises and is used for heterogeneous drive coil; Rotor assembly, this rotor assembly has permanent magnet; With built-in printing distributing board (PWB), this printing distributing board has the drive circuit that mounted thereto being used to encourages said drive coil.This drive circuit comprises the MOSFET to the drive coil power supply, the gate drivers of control MOSFET, and predriver, and this predriver supplies to gate drivers with pwm signal.This PWB has power module mounted thereto, and power module forms through MOSFET and gate drivers are become one.Power module comprises within it or the setting section in gate drivers or in MOSFET that this setting section is used to set the electrical strength of MOSFET.The present invention further comprises the electric device with this brushless DC motor.The structure of discussing above makes that motor is reliable, compact, in light weight on the size, and make motor be easy to install and wiring.This structure also can provide the electric device that uses this brushless DC motor.
Claims (12)
1. brushless DC motor comprises:
Stator module, said stator module have and are used for heterogeneous drive coil;
Metal bracket, said metal bracket are used to cover first end of said stator module;
Rotor assembly, said rotor assembly has permanent magnet; With
Printing distributing board (PWB); Said printing distributing board is packed into and is made said printing distributing board rigidity be installed on the said stator module in the motor and insulation board is placed between said printing distributing board and the said metal bracket; Said printing distributing board has the drive circuit that is used to drive said drive coil
Wherein
Said drive circuit comprises:
(a) six MOSFET, said six MOSFET are used for supplying power to drive coil;
(b) three gate drivers, said three gate drivers are used to control MOSFET;
(c) predriver, said predriver is used for pwm signal is supplied to gate drivers; With
(d) setting section, said setting section is used to set the electrical strength of said six MOSFET,
Wherein:
Said printing distributing board comprises power module, and said power module forms through said six MOSFET and said three gate drivers are become one,
Said setting section is positioned at said power module,
Said power module comprises:
Said six MOSFET;
Said three gate drivers;
The lead-in wire electrode, said lead-in wire electrode is crooked towards said printing distributing board; With
Framework, in the bending direction side of said lead-in wire electrode, said frame rigidity is welded said six MOSFET and said three gate drivers,
Said power module utilizes the epoxy resin as moulded resin to seal and form through with bonding wire said six MOSFET being connected to said three gate drivers then, and
Said power module is installed to the bracket side of said printing distributing board and forms through high-termal conductivity elasticity silicone heat is loose to said carriage.
2. brushless DC motor according to claim 1, wherein said setting section further comprises at least one in resistor and the capacitor.
3. brushless DC motor according to claim 1, wherein said drive circuit further comprises magnetic sensor, said magnetic sensor is used for the position of magnetic pole of the said permanent magnet of sensing, and said magnetic sensor is set on the PWB.
4. brushless DC motor according to claim 1, wherein for each MOSFET, said setting section is set the source electrode of MOSFET and the rate of change of the voltage between the drain electrode is a predetermined value.
5. brushless DC motor according to claim 1, wherein for each MOSFET, the drain current rate of change that said setting section is set MOSFET is a predetermined value.
6. brushless DC motor according to claim 1, wherein for each MOSFET, said setting section is set at predetermined value time of delay with the conduction and cut-off of MOSFET.
7. brushless DC motor according to claim 6, wherein for each MOSFET, said setting section further is set at predetermined value with the threshold voltage of the grid of MOSFET.
8. brushless DC motor according to claim 1, wherein each MOSFET has given snowslide resistance.
9. electric device, said electric device comprises brushless DC motor according to claim 1.
10. electric device according to claim 9, said electric device is an air conditioner, and said brushless DC motor is a fan motor.
11. electric device according to claim 9 further comprises power supply and another device except brushless DC motor, wherein said motor and said another device both are connected on the power supply.
12. electric device according to claim 11, wherein said electric device are the outdoor units of air conditioner, said brushless DC motor is a fan motor, and said another device is a compressor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP197154/2005 | 2005-07-06 | ||
| JP2005197154 | 2005-07-06 | ||
| PCT/JP2006/312458 WO2007004429A1 (en) | 2005-07-06 | 2006-06-15 | Brushless dc motor and electric device using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1989680A CN1989680A (en) | 2007-06-27 |
| CN1989680B true CN1989680B (en) | 2012-01-11 |
Family
ID=36950240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800003003A Active CN1989680B (en) | 2005-07-06 | 2006-06-15 | Brushless DC motor and electric device using the same |
Country Status (4)
| Country | Link |
|---|---|
| JP (2) | JP4682985B2 (en) |
| KR (1) | KR20070032959A (en) |
| CN (1) | CN1989680B (en) |
| WO (1) | WO2007004429A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070032959A (en) * | 2005-07-06 | 2007-03-23 | 마쯔시다덴기산교 가부시키가이샤 | Brushless DC motors and electrical devices using them |
| JP5406485B2 (en) * | 2008-09-16 | 2014-02-05 | 日本電産テクノモータ株式会社 | Motor drive device |
| CN101841287B (en) * | 2009-03-16 | 2013-04-24 | 建准电机工业股份有限公司 | Modulated delay time control system for motor |
| GB0908111D0 (en) * | 2009-05-12 | 2009-06-24 | Peto Raymond J | A motor controller & related method |
| KR101316144B1 (en) * | 2012-06-11 | 2013-10-08 | 뉴모텍(주) | Motor |
| US9344018B2 (en) * | 2013-08-23 | 2016-05-17 | Ld Design Electronics Ab | Method for making a motor quieter |
| JP6343247B2 (en) * | 2015-03-31 | 2018-06-13 | ミネベアミツミ株式会社 | Motor drive control device and motor drive control method |
| EP3297140A1 (en) | 2016-09-19 | 2018-03-21 | Black & Decker Inc. | Control and power module for brushless motor |
| JP6939201B2 (en) | 2017-07-28 | 2021-09-22 | 日本電産株式会社 | motor |
| JP7083642B2 (en) * | 2017-12-28 | 2022-06-13 | 株式会社小糸製作所 | Motors and lamps using them |
| US10888036B1 (en) | 2019-12-18 | 2021-01-05 | Toyota Motor Engineering & Manufacturing North America, Inc. | Thermal management assemblies for electronic assemblies circumferentially mounted on a motor |
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- 2006-06-15 KR KR1020067027363A patent/KR20070032959A/en not_active Application Discontinuation
- 2006-06-15 WO PCT/JP2006/312458 patent/WO2007004429A1/en active Application Filing
- 2006-06-15 CN CN2006800003003A patent/CN1989680B/en active Active
- 2006-06-15 JP JP2006549726A patent/JP4682985B2/en active Active
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| US5280228A (en) * | 1990-03-20 | 1994-01-18 | Hitachi, Ltd. | Inverter circuit |
| US5237064A (en) * | 1992-05-20 | 1993-08-17 | Merck & Co., Inc. | Process for producing 7β-substituted-aza-5αandrostan-3-ones |
| US5408150A (en) * | 1992-06-04 | 1995-04-18 | Linear Technology Corporation | Circuit for driving two power mosfets in a half-bridge configuration |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070032959A (en) | 2007-03-23 |
| CN1989680A (en) | 2007-06-27 |
| JP2011055703A (en) | 2011-03-17 |
| JP2008538692A (en) | 2008-10-30 |
| JP4682985B2 (en) | 2011-05-11 |
| WO2007004429A1 (en) | 2007-01-11 |
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