CN1146659A - Power driving circuit for brushless motor and driving method thereof - Google Patents
Power driving circuit for brushless motor and driving method thereof Download PDFInfo
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- CN1146659A CN1146659A CN95117187A CN95117187A CN1146659A CN 1146659 A CN1146659 A CN 1146659A CN 95117187 A CN95117187 A CN 95117187A CN 95117187 A CN95117187 A CN 95117187A CN 1146659 A CN1146659 A CN 1146659A
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Abstract
The present invention relates to a driving circuit for brushless motor and its driving method. It is characterized by that several indepdendent power sources are used, and each of them and a transistor power switch of the inverse parallel follow current diode are formed into a series circuit, and said branch circuit is cross-connected between star ends of all phase-windings of motor which are connected in the form of star-connection, and all branch circuits are combined into a closed loop circuit in same direction. Its driving method is as follows: according to the position signal of position sensor, the power switches are switched on in turn, and the motor windings are positively and inversely powered on in turn. Said invention is applicable to power-driven equipment powered-on by battery set for example motor car etc.
Description
The present invention relates to a kind of circuit and driving method thereof that is used for the brushless motor power drive, be specially adapted to the main shaft drives of electric automobile and have a plurality of independent current sources, the speed governing drive controlling of low-voltage (slow-speed of revolution), big moment (big electric current) occasion and family expenses fan, air-conditioning, dust catcher, sewing, pump class.
Existing brushless motor power driving circuit all adopts a DC power supply or a pair of DC power supply that contains mid point.For three-phase brushless motor, its drive circuit mostly adopts H bridge or three-phase bridge structure, as shown in Figure 1.The distinct disadvantage of this drive circuit is that the transistor power switch quantity of use is many, generally is 2 times or 4 times of the motor number of phases; In addition, straight-through fault reliability variation takes place in upper and lower brachium pontis transistor easily, therefore must be set the off time (or claiming Dead Time) of upper and lower brachium pontis, and placed restrictions on the switching frequency of power transistor when pulse width modulation controlled off time, particularly serious during big moment (also being big electric current) drives.It is fewer that people wish to study a kind of use transistor power switch always, drives reliability than higher, also is the higher brushless electric drive circuit of the ratio of performance to price, but all adopts achieving success.Fig. 2 is a kind of miniature brushless motor drive circuit that can be used for.In the sort circuit, the electric current of every phase winding can only flow by positive direction, and electric efficiency is low; And do not have the afterflow ability, thus can not be by adopting pulse modulation technology to carry out speed regulating control to three transistor power switchs, sort circuit can only act in drive system miniature, constant speed.Common stepping motor Unipolar driving circuit can not be used for the driving of brushless motor.Clearly, in the typical circuit as shown in Figure 3, the negative half period of the back-emf of afterflow and damper diode meeting short circuit motor.Fig. 4 is a kind of afterflow energy consumption type brushless electric drive circuit.It adopts in miniature brushless motor or switchette reluctance motor, and in running, the afterflow energy shifts to capacitor C by sustained diode, and capacitance voltage increases, after reaching voltage-stabiliser tube W puncture voltage, by voltage-stabiliser tube W and resistance R to U
SFeedback.Because most of afterflow energy consumption is on resistance, " pump rises phenomenon " is serious, and winding current can't be reverse, and efficient is low, all is its weakness.Clearly, sort circuit also can only use in the electrical micro-machine scope.So three-phase or heterogeneous high-power brushless motor fail to find higher drive circuit of the ratio of performance to price and driving method so far always.
Generally drive with dual H-bridge for two-phase motor, the transistor power switch quantity of use is more than three-phase bridge.So two-phase electric machine uses extensively not as three phase electric machine.And the H bridge drives same the existence, the problem that straight-through fault makes the reliability variation easily takes place in upper and lower brachium pontis transistor, therefore, must be set the off time (or claiming Dead Time) of upper and lower brachium pontis, and placed restrictions on the switching frequency of power transistor when pulse width modulation controlled off time, particularly serious during high-speed cruising.Another drive circuit of two-phase brushless motor is called T type drive circuit as shown in Figure 5, and sort circuit uses a pair of DC power supply that contains mid point, the upper and lower brachium pontis of T type circuit need use N type and P type complementary transistor right.As everyone knows, high-power P transistor npn npn is because production technology difference and can't be practical, so this double-T shaped drive circuit can only use in electrical micro-machine.Dual H-bridge crystal drive circuit and double-T shaped drive circuit belong to the bipolarity drive circuit, also promptly allow the motor windings two-way communication, circuit itself has the afterflow ability, so, can realize rotating speed control or torque control by pulse-width modulation to the power switch drive signal to brushless motor.But owing to use number of elements many, and the circuit complexity, cost is higher, is difficult in extensively effect in family expenses, the civilian motor-driven field.
The object of the present invention is to provide a kind of brushless electric machine circuit and driving method, make motor have better simply structure, it is few to make drive circuit have components and parts, good reliability, cost is low, simultaneously have the H bridge again, the comparison characteristic of double-T shaped this class bipolarity drive circuit also promptly can realize the rotating speed control or the torque of brushless motor are controlled by pulse-width modulation.
Brushless electric drive circuit of the present invention, when unit brush motor is three-phase or heterogeneous more than the three-phase, the polyphase windings of its motor is by Y-connection, and its main points are that the brachium pontis that constitutes between the adjacent star end is by the independent DC power supply U that is connected in series by forward sequence
1, U
2U
mWith transistor power switch T
1, T
2T
mThe branch road that constitutes, sustained diode of reverse parallel connection between the collector electrode of each transistor power switch and the emitter
1, D
2... D
m, the base stage of each transistor power switch connects the output of motor drive controller, and m arm path is by the equidirectional closed-loop path that is connected into, and m is the natural number more than or equal to 3.
When brushless motor is two phase times, adopt four transistor power switch T
a, T
b, T
c, T
d, four sustained diode
a, D
b, D
c, D
dEach transistor power switch all with a fly-wheel diode reverse parallel connection, four transistor power switchs constitute the closed-loop path with four brachium pontis according to the series connection of equidirectional order, form four brachium pontis node a, b, c, d, independent current source U
dAnd U
cBe connected in odd number brachium pontis or the even number brachium pontis, two phase windings of motor are the quadrature independent winding, jump on the four phase brachium pontis nodes by the winding phase sequence.
The driving method of brushless motor of the present invention, its main points be according to the position transducer sensitivity the position of magnetic pole signal, control each winding of motor wheel flow-thru electrode, when motor is three relative, press T
A→ T
AB→ T
B→ T
BT
C→ T
C→ T
CT
A→ T
AEach power switch is opened in six bats in proper order, make motor by phase sequence A B → A BB C → B C → B CC A → C A → C AA B → A B positive and negative energising direction of each phase winding of conversion sequentially, motor just changes.Also can make the motor counter-rotating by above-mentioned opposite order energising.When motor is two phase times, power switch is opened order and is T
dT
a→ T
aT
b→ T
bT
c→ T
dT
aPhase sequence is a → b → a → b → a, and motor just changes, or makes the motor counter-rotating by the rightabout energising.
The driving basic skills of heterogeneous many power supplys brushless electric drive circuit is: according to position sensor information, press the series sequence or the backward of brachium pontis series loop, clap the energising commutation or single doublebeat is switched at interval by single mutually, or the doublebeat energising, make motor obtain continuous torque.For three-phase brushless motor, the present invention powers with a plurality of independent current sources, solved traditional unipolarity driving and can't make the motor windings two-way communication, problem that can't afterflow, thereby under the situation of the advantageous characteristic that guarantees to have the traditional double polarity driven, make the power switch of power driving circuit, fly-wheel diode quantity reduces to 1/2 or 1/4, and control method also is simplified.Because this new drive circuit uses a plurality of independent current sources, the gap power supply, afterflow charging in gap so be suitable for battery-powered Power Drive Unit especially, can make battery life prolong.
Because drive circuit of the present invention has possessed the four-quadrant controllable characteristics naturally, drive system of electric automobile is needed just for this.Theory and practice can further prove drive circuit of the present invention and method, has low-voltage (slow-speed of revolution), big electric current (big moment), and the characteristics that stalling torque is big, the stalling torque fluctuation is little also promptly have the characteristics of direct driving.Therefore, be rich in application prospect for battery powered electric automobile.In addition, the present invention can be used in the drive system of all kinds of brushless motors by transformer-supplied, so that obtain perfect performance price ratio.Brushless electric drive circuit of the present invention also is applicable to the driving and the control of switched reluctance motor and stepping motor, also is applicable to the induction motor frequency conversion drive.As can be seen, the present invention will cause the realization and the development of the novel drive motors of class system.
For the two-phase brushless motor, the present invention powers with two independent current sources, makes simple drive circuit have the characteristic of traditional double polarity driven, make the power switch of power driving circuit, fly-wheel diode quantity reduces to 1/2, and does not have straight-through phenomenon, and control is simple, reliability is high.
Two independent current sources can adopt the single phase industrial frequence power supply easily, and any in the past bipolarity adjustable speed drive circuit that drive circuit compares is simple and reliable, so, at family expenses, for example civilian: stepless speed regulating electric fan; The automatic air condition of no start-stop noise, dust catcher, robot; In the drive system that electronic sewing, pump class, electromagnetically operated valve etc. need rotating speed or torque to control application prospect is arranged all.
Description of drawings:
Fig. 1 is existing H bridge brushless electric drive circuit, and wherein a is single-phase H bridge, and b is a three-phase bridge; Fig. 2 is miniature brushless motor constant-speed drive circuit; Fig. 3 is the stepping motor Unipolar driving circuit; Fig. 4 is miniature brushless motor variable speed drives circuit; Fig. 5 is a two-phase T type drive circuit; Fig. 6 is a three-phase brushless motor drive circuit of the present invention, and wherein a is the form that power supply is connected on emitter, and b is the form that power supply is connected on transistor collector, and Fig. 7 is three-phase triple time of the present invention drive waveforms; Fig. 8 is an invention three-phase six-beat drive waveforms; Fig. 9 is the heterogeneous many power supplys brushless electric of a present invention drive circuit, and wherein a is that four phases, b are that five phases, c are six phases; Figure 10 is an embodiment 1A phase current measured waveform; Figure 11 is an invention two-phase duplicate supply drive circuit; Figure 12 claps drive waveforms for two-phase four of the present invention; Figure 13 is the drive circuit of two-phase brushless motor single phase industrial frequence power supply power supply of the present invention; Figure 14 is embodiment 2, two-phase brushless motor phase current measured waveform; Figure 15 is the circuit theory diagrams of a three-phase brushless motor control circuit, and SS is the velocity setting signal among the figure, and sd is the given signal of direction of rotation, P
A, P
B, P
CBe respectively A, B, the C of brushless motor square wave position signalling, P from position transducer
0For picking up from other position signalling of position transducer.
Below in conjunction with embodiment, the present invention and operation principle are described further.
Embodiment 1:
Elder generation is that example is illustrated with the drive circuit that the present invention is used for three-phase brushless motor.As shown in Figure 6, three-phase brushless motor uses three power switch T
A, T
B, T
C, three sustained diode
A, D
B, D
CWith three independent direct current U
A, U
B, U
CConstitute three brachium pontis.Each brachium pontis is by one and power switch and equidirectional being composed in series of independent DC power supply of fly-wheel diode are arranged, and three brachium pontis are then according to the equidirectional closed-loop path that is connected into.Three phase winding stars of motor connect, and link with three brachium pontis nodes then, constitute three-phase unit brush motor drive circuit as shown in Figure 6.As if the T in three power switchs
APower switch conducting, then independent current source U
ATo the energising of A phase winding forward, the while around reverse energising, is called the AB "on" position to B, in this "on" position, and can be to T
ACarry out the pulse pulse width control, see that whether circuit has the afterflow ability, works as T
ABecome the pass because of pulse width modulated from conducting, then the inductance energy storage of A, B two phase windings suddenly
Pass through sustained diode
B, D
CTo power supply U
B, U
CTherefore feedback has the afterflow ability.Equally, when adopting doublebeat commutation control, if T
AT
BAfter the conducting simultaneously, transfer shutoff suddenly to, the afterflow energy passes through sustained diode
CTo power supply U
CFeedback.Has the afterflow ability when therefore the commutation of sort circuit doublebeat is controlled equally.Its performance and H bridge shown in Figure 1, bipolar circuits such as three-phase bridge are similar.
The driving method of brushless motor power driving circuit of the present invention, identical on the principle with typical brushless electric drive circuit, promptly according to the position of magnetic pole signal of position transducer sensitivity, according to the brachium pontis series sequence, by changing the state of power switch, adopt each phase winding wheel flow-thru electrode of control motor.But, produced the effect of traditional double polarity driven because the driving circuit structure difference makes the unipolarity drive signal.With the three-phase brushless motor is example, drive circuit as shown in Figure 6, and its commutation control logic is T
A→ T
B→ T
C, that is, press T
A, T
B, T
COrder is opened three power switchs, makes corresponding motor three phase windings by phase sequence A B → B C → C A → A B positive and negative energising of each phase winding of conversion sequentially; Thereby make motor obtain continuous driving torque; Fig. 7 represents the sequential relationship of position signalling (also being electric potential signal) and commutation signal, i
A, i
B, i
CIt is the current waveform of three phase windings.Because the winding of three phase electric machine connects by star, the conducting of each power switch causes an independent current source power supply, two winding energisings, finish an energising cycle per triple time, in each energising cycle, every phase winding all at least forward energising once and oppositely energising is once.Owing to allow electric current forward and reverse mobile, has the afterflow ability, in each energising commutation states (also being each bat), by pulse width modulated rotating speed control and the torque control that realizes motor to this power switch drive signal.This feature, significantly difference in the past the Unipolar driving circuit of all kinds of motor (for example: Fig. 2, Fig. 3, Fig. 4).
Brushless electric drive circuit of the present invention also can doublebeat or single doublebeat drive controlling.For drive circuit shown in Figure 6, according to the position of magnetic pole signal of position transducer sensitivity, according to the brachium pontis series sequence, by changing three transistor power switch T
A, T
B, T
CState, adopt the energising in turn of control motor A, B, C three phase windings, promptly according to T
A→ T
AT
B→ T
B→ T
BT
C→ T
C→ T
CT
A→ T
AEach power switch is opened in six bats in proper order, make three-phase brushless motor by phase sequence A B → A BB C → B C → B CC A → C A → C AA B → A B positive and negative energising direction of each phase winding of conversion sequentially, thereby obtain continuous driving torque; Per six clap and to finish an energising cycle, in each energising cycle, every phase winding all at least the forward energising once and oppositely energising is once; Each energising commutation states (also being that each is clapped) is by one or two corresponding independent current source power supplies, owing to allow the winding current two-way flow, has the afterflow ability, so in each energising commutation states, by pulse width modulated rotating speed or the torque control that realizes motor to conducting power switch drive signal.The motor steering control method of brushless electric drive circuit of the present invention is identical with conventional method.For example single bat control makes T into
A→ T
C→ T
B→ T
AOrder is opened power switch and is realized A B → C A → B C → A B winding commutation, can make the motor counter-rotating.Same doublebeat control makes T into
A→ T
AT
C→ T
C→ T
CT
B→ T
B→ T
B→ T
BT
A→ T
AOrder is opened power switch, realize A B → A BC A → C A → C AB C → B C → B CA B → A B winding commutation, can make the motor counter-rotating.
Brushless electric drive circuit of the present invention can be applied to the above brushless motor of three-phase, and for example 4,5,6 ... etc. heterogeneous brushless motor, as shown in Figure 9.
Figure 15 is the practical circuit diagram of present embodiment drive circuit controller.Use three-phase brushless motor drive circuit shown in Figure 6, drive a three-phase, 6 utmost points, 400 watts of permanent magnet brushless electromotors, the controllable rotation speed scope is ± 2000 rev/mins, adopts triple time commutation control, pulse width modulated rotating speed control.Power switch adopts IBGT, and modulating frequency is 18KHZ.Figure 10 is its low speed (n=143rpm), the A phase measured current waveform under full load (T=27Nm) situation.
Prove absolutely that this circuit has the bipolarity drive characteristic, and afterflow is good, obvious drive circuit is extremely simple.
Embodiment 2:
Present embodiment two-phase brushless electric drive circuit is by the transistor power switch, and the afterflow diode is formed, and uses four transistor power switch T
a, T
b, T
c, T
dFour sustained diode
a, D
b, D
c, D
dEach transistor power switch all with a fly-wheel diode reverse parallel connection, four transistor power switchs constitute the closed-loop path with four brachium pontis according to the series connection of equidirectional order, form four phase brachium pontis node a, b, c, d, and two independent current source U
dAnd U
c, being connected in odd number brachium pontis or the even number brachium pontis, two phase windings of motor are the quadrature independent winding, jump on four brachium pontis nodes, as shown in figure 13 by the winding phase sequence.If U
aBe connected on T
aIn the power-switch arm, then suitable according to the order of sequence, U
CShould be connected on T
CIn the brachium pontis at power switch place.If power switch T
dT
aConducting, then independent current source U
aTo the energising of a phase winding forward, current i
aFlow to the c node from a node, be called a "on" position, in this "on" position, can be to T
a, T
dCarry out Pulse Width Modulation Control With, see that whether circuit has the afterflow ability, works as T
a, T
dBecome shutoff because of pulse width modulated from conducting, then the inductance energy storage of a phase winding suddenly
Pass through sustained diode
C, D
bFormation is to U
CThe afterflow of charging is by the road, to power supply U
CTherefore feedback inductance energy storage has the afterflow ability.For motor is rotated continuously, can be according to the position signalling of the position transducer sensitivity of brushless motor, according to the brachium pontis series sequence, by changing the state of power switch, control motor two phase windings take turns positive and negative energising, its commutation logic is: T
dT
a→ T
aT
b→ T
bT
c→ T
cT
d→ T
dT
a, corresponding motor two-phase winding is pressed the positive and negative energising of phase sequence a → b → a → b → a sequence period ground conversion winding, thereby makes motor obtain continuous driving torque; Figure 12 shows the sequential relationship of position signalling (also being electric potential signal) and power switch commutation signal, i
a, i
bIt is the current waveform of two-phase winding.As everyone knows,, have the afterflow ability owing to allow electric current forward and reverse mobile, so, can be by the power switch drive signal being carried out pulse width modulated rotating speed control and torque control of adopting realization to motor.Brushless electric drive circuit of the present invention is identical with conventional method to the rotating direction control method of motor, if above-mentioned energising logic makes T into
aT
d→ T
dT
c→ T
cT
d→ T
bT
a→ T
aT
d, then corresponding motor two-phase winding is pressed the positive and negative energising of phase sequence a → b → a → b → a sequence period ground conversion winding, thereby makes motor by opposite direction rotation.
The present embodiment drive circuit need use two independent current sources, so be specially adapted to the occasion with the power supply of pond group, for example electric automobile.Certainly also be suitable for the occasion of transformer-supplied.Because the power supply of independent current source gap, charged by afterflow in the gap, prolonged the useful life of battery pack greatly, so application prospect is more arranged on electric automobile.
For the present invention can be used on the family expenses single phase poaer supply, can further use the present invention to obtain the independent current source of two equivalences from the single phase industrial frequence power supply.Circuit uses four rectifier diode D
1～D
4And two filter capacitor C
aAnd C
cPower frequency supply U
APositive half cycle, by D
1→ C
a→ D
3→ U
SConstitute the forward commutating circuit, to C
aCharging, the independent current source U of formation halfwave rectifier
APower frequency supply U
ANegative half period, by D
2→ C
c→ D
4→ U
SConstitute reverse commutating circuit, to C
cCharging, another independent current source U of formation halfwave rectifier
C, as shown in figure 13.
Use the two-phase brushless electric drive circuit of use single phase industrial frequence power supply shown in Figure 13, drive a two-phase, four utmost points, 400 watts of sewing machine brushless motors, the range of speed control is ± 2500 rev/mins, adopt the Hall switch position transducer, pulse width modulated rotating speed control, power switch adopts IGBT, and modulating frequency is 18KHZ.Figure 14 is its low speed (n=130rpm), and the A phase measured current waveform under load (T=2.7N.m) situation prove absolutely that this circuit has the bipolarity drive characteristic, and afterflow is fine.Because the element that uses has almost lacked one times, so the manufacturing cost of this circuit has only about 1/2nd of dual H-bridge drive circuit.
Claims (4)
1. brushless motor power driving circuit, when brushless motor is three-phase or heterogeneous more than the three-phase, the polyphase windings of its motor is characterized in that by Y-connection: the brachium pontis that constitutes between the adjacent star end is the independent DC power supply [U by the forward sequence series connection
1], [U
2] ... [U
m] and transistor power switch [T
1], [T
2] ... [T
m] branch road that constitutes, fly-wheel diode O of reverse parallel connection between the collector electrode of each transistor power switch and the emitter
1, O
2O
m, the base stage of each transistor power switch connects the output of motor drive controller, and m arm path is by the equidirectional closed-loop path that is connected into, and m is the natural number more than or equal to 3.
2. according to the described drive circuit of claim 1,, it is characterized in that adopting four transistor power switch T when brushless motor is two phase times
a, T
b, T
c, T
d, four sustained diode
a, D
b, D
c, D
dEach transistor power switch all with a fly-wheel diode reverse parallel connection, four transistor power switchs constitute the closed-loop path with four brachium pontis according to the series connection of equidirectional order, form four brachium pontis node a, b, c, d, independent current source U
dAnd U
cBe connected in odd number brachium pontis or the even number brachium pontis, two phase windings of motor are the quadrature independent winding, jump on four brachium pontis nodes by the winding phase sequence.
3. the driving direction of a brushless electric drive circuit is characterized in that: according to the position of magnetic pole signal of position transducer sensitivity, control each winding wheel flow-thru electrode of motor; When motor is three phase times, press T
A→ T
AT
B→ T
B→ T
BC→ T
C→ T
CA→ T
AEach power switch is opened in six bats in proper order, make the positive and negative energising direction of motor by phase sequence A B → A BB C → B C → B CC A → C A → C AA B → each phase winding of A B order conversion, motor just changes; Also can make the motor counter-rotating by above-mentioned opposite power-up sequence.
4. according to the described driving method of claim 3, it is characterized in that working as motor is two phase times, the transistor power switch is opened order and is T
dT
a→ T
aT
b→ T
bT
c→ T
cT
d→ T
dT
a, phase sequence is that a → b → a → b → a motor just changes, or makes the motor counter-rotating by the rightabout energising.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95117187A CN1146659A (en) | 1995-09-29 | 1995-09-29 | Power driving circuit for brushless motor and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95117187A CN1146659A (en) | 1995-09-29 | 1995-09-29 | Power driving circuit for brushless motor and driving method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1146659A true CN1146659A (en) | 1997-04-02 |
Family
ID=5081170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95117187A Pending CN1146659A (en) | 1995-09-29 | 1995-09-29 | Power driving circuit for brushless motor and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1146659A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101803632A (en) * | 2010-04-14 | 2010-08-18 | 北京农业职业学院 | Corn yoghurt and processing method thereof |
| CN103490683A (en) * | 2013-09-09 | 2014-01-01 | 南京康尼电子科技有限公司 | Three-phase motor operation direction control device |
| CN105337541A (en) * | 2015-12-02 | 2016-02-17 | 刘振韬 | Multi-phase brushless direct current motor and driving method thereof |
| CN111765290A (en) * | 2020-05-22 | 2020-10-13 | 中国航发贵州红林航空动力控制科技有限公司 | Flow proportion solenoid valve drive circuit device |
| CN112825461A (en) * | 2019-11-18 | 2021-05-21 | 彭明 | Star-connected phase-by-phase driven brushless motor and driver circuit |
-
1995
- 1995-09-29 CN CN95117187A patent/CN1146659A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101803632A (en) * | 2010-04-14 | 2010-08-18 | 北京农业职业学院 | Corn yoghurt and processing method thereof |
| CN103490683A (en) * | 2013-09-09 | 2014-01-01 | 南京康尼电子科技有限公司 | Three-phase motor operation direction control device |
| CN103490683B (en) * | 2013-09-09 | 2017-12-01 | 南京康尼电子科技有限公司 | Three phase electric machine rotation direction control device |
| CN105337541A (en) * | 2015-12-02 | 2016-02-17 | 刘振韬 | Multi-phase brushless direct current motor and driving method thereof |
| US10298160B2 (en) | 2015-12-02 | 2019-05-21 | Chun To Lau | Multi-phase brushless direct-current motor and drive method therefor |
| CN112825461A (en) * | 2019-11-18 | 2021-05-21 | 彭明 | Star-connected phase-by-phase driven brushless motor and driver circuit |
| CN111765290A (en) * | 2020-05-22 | 2020-10-13 | 中国航发贵州红林航空动力控制科技有限公司 | Flow proportion solenoid valve drive circuit device |
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