CN203251261U - Brushless DC motor power conversion circuit - Google Patents
Brushless DC motor power conversion circuit Download PDFInfo
- Publication number
- CN203251261U CN203251261U CN 201320228329 CN201320228329U CN203251261U CN 203251261 U CN203251261 U CN 203251261U CN 201320228329 CN201320228329 CN 201320228329 CN 201320228329 U CN201320228329 U CN 201320228329U CN 203251261 U CN203251261 U CN 203251261U
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- China
- Prior art keywords
- motor
- commutation
- switch
- main circuit
- zeta converter
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Abstract
The utility model provides a brushless DC motor power conversion circuit used for reducing the torque ripple of a brushless DC motor. The circuit is formed by a ZETA converter, an inversion main circuit, and transfer switches. Before the commutation of a motor winding controlled by the inversion main circuit, a transfer switch S3 is switched on, a transfer switch S2 is switched off, and through the collected motor real-time speed value and duty ratio controlled by a switch S1 of the ZETA converter, the output voltage following of the ZETA converter is controlled and a certain proportional relationship is formed between the output voltage and a motor back electromotive force value. After the commutation is completed, the S3 is switched off, and the S2 is switched on, which is equivalent to that the ZETA converter works before the commutation of a winding in every time. By employing the method and the circuit, the current rise and decrease slopes of windings of switch-on and switch-off phases in the commutation can be the same, the current and torque ripple are small, the noise is reduced accordingly, and the application of this kind of motor systems is broadened.
Description
Technical field
The utility model relates to a kind of brshless DC motor power conversion circuit, the power conversion circuit of the torque pulsation that produces in the time of can suppressing the commutation of brshless DC motor winding.
Background technology
The torque pulsation problem of brshless DC motor is to hinder bottleneck that it is used in some field always, also is focus both domestic and external in recent years about the research and practice of its torque pulsation always.The torque pulsation that wherein produces during commutation between the different windings of motor is the most obvious.
The basic reason that torque pulsation produces during the winding commutation, be turn-off with two electric currents opening phase descend with raise asynchronous, slope is different, thereby has caused the current waveform that synthesizes to produce herein fluctuation, the output torque that affects motor is pulsed.
On correlation theory, if make shutoff synchronous with the curent change of opening phase, must to allow the inverter main circuit dc power supply voltage of its power inverter become the fixed proportion relation with motor winding back electromotive force, and general counter electromotive force of motor size and rotating speed proportion relation, that is to say the power supply size to follow motor speed and change, and satisfy certain proportion relation, the torque pulsation problem in the time of then commutation can being suppressed.
Summary of the invention
Based on above background, the utility model proposes a kind of new power conversion main circuit form based on the ZETA converter, can realize the inhibition of brshless DC motor commutation torque pulsation when cooperating certain control mode.
The technical scheme that its technical problem that solves the utility model adopts is:
This new power translation circuit comprises ZETA converter, inverter main circuit, change over switch S2 and S3, and power supply and brshless DC motor winding.The commutation of inverter main circuit control brshless DC motor three phase windings, before commutation, control change over switch S2 disconnects, S3 is closed simultaneously, constant dc current source U
sDirect voltage U by the output of ZETA converter
0Be the power supply of motor winding as inverter main circuit, voltage U
0Size depend on the velocity amplitude of motor, regulate the switch S 1 of ZETA converter according to the velocity amplitude that transducer gathers, and then regulated U
0Value; After commutation finished, the closed simultaneously S3 of S2 disconnected, and inverter main circuit is by constant-current source U
sDirectly power supply.
The beneficial effects of the utility model are, at commutation period, adopt after this circuit and the control model, opening of commutation period will be along identical slope rise and fall with the electric current that turn-offs phase, the fluctuation of resultant current will reduce greatly, become to be similar to proportional relation under the certain condition and satisfy between winding current and the torque, thereby also just suppressed torque pulsation.
Description of drawings
When Figure 1 shows that between the brshless DC motor winding commutation, the different resultant current waveform that different supply power voltages and back electromotive force Relations Among obtain.
Wherein: i
a, i
b, i
cExpression is turn-offed phase, is opened phase and resultant current respectively; t
1And t
2Expression is turn-offed the phase turn-off time and is opened mutually service time respectively; E represents back electromotive force; U
dBe the power supply phase voltage.
Fig. 2 is the brshless DC motor new power inverter main circuit that the utility model proposes.
Wherein: VT1-VT6 is six switching tubes; BLDCM is the abbreviation of brshless DC motor; Be respectively ZETA converter and inverter main circuit in two dotted line frames.
Embodiment
(a) of Fig. 1 be (c) three subgraphs (b), have characterized the resultant current situation when different supply power voltages and four times of back electromotive force concern.If U
d≠ 4E, when the switching tube conducting state of inverter main circuit changes and enters commutation during the stage, because the impact of armature winding inductance, electric current can not suddenly change, and turn-offs mutually and open the phase current rate of change not to be both the basic reason that causes the commutation torque pulsation.
(1) works as U
dDuring=4E, t
1=t
2, the commutation period torque is constant;
(2) work as U
dDuring>4E, t
1>t
2, the commutation period torque increases;
(3) work as U
dDuring<4E, t
1<t
2, the commutation period torque reduces.
Current changing rate is by DC side supply power voltage U
dE determines jointly with back electromotive force, and E is directly proportional with rotating speed, by detecting the real-time speed value of motor, can hold comparatively accurately the E value; Generally, dc voltage U
dOften remain unchanged, and the velocity variations of motor impels E to change, and can not satisfy all the time U during speed governing
d=4E, therefore the torque pulsation when commutation is just apparent in view.
And in the new power inverter main circuit of Fig. 2, increased the ZETA converter, this converter can under the constant prerequisite of input direct voltage, by the duty cycle of switching of control S1, change output dc voltage U
0Size, if this moment, S3 was closed again, U then
0=U
dBe exactly inverter voltage.
Input/output relation according to ZETA copped wave string road
α is ZETA chopper circuit duty ratio in the formula, is controlled by S1.The pass of back electromotive force E and motor speed is
E=C
eΦn (2)
C in the formula
eTo prop up way relevant with the number of pole-pairs of motor and winding parallel, is constant; Because brshless DC motor is magnet structure, its magnetic flux phi also is constant; Thereby basic linear approximate relationship between E and the n, obtain can obtain after the value of n the value of E.
At commutation period, so that U
d=U
0=4E can get according to formula (1) and (2)
If supplying DC voltage U in the formula
SKeep constant, the real-time speed signal that gathers of Negotiation speed feedback transducer then, the switch of S1 switching tube that can real time altering ZETA converter changes duty ratio, so that U
d=U
0It is stable that=4E keeps, and cut the ZETA circuit in commutation temporarily, thereby suppress the generation of commutation torque pulsation.After commutation finished, S3 disconnected, and S2 is closed.
Claims (1)
1. a brshless DC motor power conversion circuit comprises ZETA converter, inverter main circuit, change over switch S2 and S3.It is characterized in that: the commutation of brshless DC motor three phase windings of inverter main circuit control, before commutation, S2 disconnects, S3 is closed, constant dc current source U
sDirect voltage U by the output of ZETA converter
0Be the power supply of motor winding as inverter main circuit, voltage U
0Size depend on the velocity amplitude of motor, regulate the switch S 1 of ZETA converter according to the velocity amplitude that transducer gathers, and then regulated U
0Value, and make U
0Keep the fixed proportion relation at commutation period and counter electromotive force of motor; After commutation finished, the closed simultaneously S3 of S2 disconnected, and inverter main circuit is by constant-current source U
sDirectly power supply.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201320228329 CN203251261U (en) | 2013-04-26 | 2013-04-26 | Brushless DC motor power conversion circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201320228329 CN203251261U (en) | 2013-04-26 | 2013-04-26 | Brushless DC motor power conversion circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
CN203251261U true CN203251261U (en) | 2013-10-23 |
Family
ID=49377675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 201320228329 Expired - Fee Related CN203251261U (en) | 2013-04-26 | 2013-04-26 | Brushless DC motor power conversion circuit |
Country Status (1)
Country | Link |
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CN (1) | CN203251261U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104852642A (en) * | 2015-05-22 | 2015-08-19 | 哈尔滨工程大学 | Compensating circuit for restraining torque ripple of brushless DC motor |
CN109861266A (en) * | 2019-01-15 | 2019-06-07 | 南京工程学院 | The flexible starting method of the flexible HVDC transmission system of the access containing extensive new energy |
-
2013
- 2013-04-26 CN CN 201320228329 patent/CN203251261U/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104852642A (en) * | 2015-05-22 | 2015-08-19 | 哈尔滨工程大学 | Compensating circuit for restraining torque ripple of brushless DC motor |
CN104852642B (en) * | 2015-05-22 | 2017-11-17 | 哈尔滨工程大学 | A kind of torque pulsation inhibited compensation circuit of brshless DC motor |
CN109861266A (en) * | 2019-01-15 | 2019-06-07 | 南京工程学院 | The flexible starting method of the flexible HVDC transmission system of the access containing extensive new energy |
CN109861266B (en) * | 2019-01-15 | 2023-02-10 | 南京工程学院 | Flexible starting method of flexible direct current transmission system with large-scale new energy access |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 Termination date: 20140426 |