CN203057050U - Electromagnetic torque ripple inhibition device for brushless direct current motor - Google Patents
Electromagnetic torque ripple inhibition device for brushless direct current motor Download PDFInfo
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- CN203057050U CN203057050U CN2013200676208U CN201320067620U CN203057050U CN 203057050 U CN203057050 U CN 203057050U CN 2013200676208 U CN2013200676208 U CN 2013200676208U CN 201320067620 U CN201320067620 U CN 201320067620U CN 203057050 U CN203057050 U CN 203057050U
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- motor
- electromagnetic torque
- brshless
- pulse modulation
- generator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model discloses an electromagnetic torque ripple inhibition device for a brushless direct current motor. An electromagnetic torque ripple which can seriously affect a rotating speed and a running efficiency of the direct current motor occurs during operation of a brushless motor, thus the electromagnetic torque ripple can affect the brushless direct current motor to be applied to the field having higher requirements to motor performance. The electromagnetic torque ripple inhibition device of the utility model comprises a direct current power supply, a brushless direct current motor, and a hall sensor arranged on the brushless direct current motor; wherein the brushless direct current motor is driven by a bridge type drive circuit, a position signal output end of the hall sensor is connected with a pulse modulation generator and a time reduction generator, a signal output end of the time reduction generator is connected with the pulse modulation generator, and a signal output end of the pulse modulation generator is connected with the bridge type drive circuit. According to the electromagnetic torque ripple inhibition device of the utility model, stator current fluctuation and the electromagnetic torque ripple which is generated during commutation and affects a running torque of the motor can be overcome through a signal of the hall sensor, thereby raising the running efficiency of the motor.
Description
[technical field]
The utility model relates to the motor circuit technical field, specifically refers to a kind of electromagnetic torque pulsation suppression device of brshless DC motor.
[background technology]
Using brshless DC motor, but because the defective of himself, electromagnetic torque pulsation can occur in the running, because rotating speed and the running efficiency of the serious brshless DC motor of existence meeting of electromagnetic torque pulsation, and then influence it and be applied to the field that motor performance is had relatively high expectations.
The reason that produces electromagnetic torque pulsation mainly contains two aspects: 1, forward the commutation position to when rotor, during the pole center line overlaid that is the rotor magnetic pole center line and produced by the stator excitation electric current, the direction of the electromagnetic force maximum (under the same stator excitation current condition) that rotor is suffered but this electromagnetic force is for radially, perpendicular with the rotation direction of motor, namely this moment, electromagnetic torque was zero, and electromagnetic force will hinder the running of rotor.
2, electromagnetic power Pe, it equals back electromotive force and line current is long-pending, that is:
Pe=e*I
In the formula: e-back electromotive force
I-line current
Disregard mechanical loss and the stray loss of rotor, electromagnetic power all is converted into rotor kinetic energy, so
Pe=T*Ω
In the formula: T-electromagnetic torque
Ω-electromechanics angular speed
By above-mentioned two formulas as can be known:
T=e*I/Ω
As can be known when rotating speed of motor is constant, the sudden change of stator current must cause the change of back electromotive force by following formula, and then changes the electromagnetic torque of motor.If in commutation constantly, with the stator current vanishing, commutation electromagnetic resistance is constantly minimized, and save electric energy, raise the efficiency, but the sudden change of electric current must cause very big instantaneous back electromotive force, to keep the primary current direction, make the running electromagnetic resistance that hinders rotor still exist.
[utility model content]
For addressing the above problem, the utility model provides a kind of electromagnetic torque pulsation suppression device that hinders the motor rotation torque that produces can overcome stator current fluctuation and commutation the time, can effectively suppress to improve motor rotation efficient because above-mentioned both reasons produce electromagnetic torque pulsation.
The technical solution of the utility model is as follows: a kind of electromagnetic torque pulsation suppression device of brshless DC motor, comprise DC power supply, brshless DC motor and be located at Hall element on the brshless DC motor, described brshless DC motor is driven by bridge drive circuit, the position signalling output of described Hall element connected the pulse modulation generator and reduced time generator, described reduced time, the signal output part of generator connected the pulse modulation generator, and described pulse modulation generator signal output has connected bridge drive circuit.Hall element on brshless DC motor, with the positional information of rotor magnet pass to the pulse modulation generator and reduced time generator, to produce corresponding pwm signal and reduced time T signal, obtain the control signal of motor after these two signal stacks, with the control bridge drive circuit, make the stator current before and after the commutation all reduce slowly and increase, and be zero at the electric current of commutation point.
As preferably, described reduced time generator comprise the control chip I, control chip I signal output part connected diode and negative pole, described pulse modulation generator pwm signal output has connected the positive pole of diode.Through diode reduced time T signal and pwm signal are superposeed.
As preferably, described control chip I signal output part has connected the negative pole of diode after a triode amplifies.
As preferably, described pulse modulation generator has comprised the control chip II, and described control chip is exported two groups of pwm signals.
As preferably, described bridge drive circuit comprises and drives chip and field effect transistor, and described driving chip input has connected the pwm signal output of pulse modulation generator, and output has connected field effect transistor, and described field effect transistor connects motor.Through the pwm signal after the stack as control signal through driving the chip controls bridge drive circuit, and then the variation of control stator current.
As preferably, described field effect transistor has two groups of four branches, and described driving chip has two, connects two groups of field effect transistor respectively.
As preferably, described Hall element is exported two groups of position signallings, and the output of two position signallings connects the filter circuit that resistance and capacitance series form respectively.Wave circuit filtering can be stablized the position signalling of Hall element output after filtration.
Compared with prior art, outstanding advantage of the present utility model is: the rotor magnet position signalling that can provide according to Hall element on the brshless DC motor, the output signal of regulating impulse modulation generator, and the shortening time T signal of the reduced time generator output that superposeed, controlled the variation of stator current then by bridge drive circuit, thereby the stator current before and after the realization commutation all reduces slowly and increases, and the stator current at commutation point is zero, reduce energy consumption, and the electromagnetic force of the running that hinders rotor is minimized, torque pulsation in the dc brushless motor running is greatly reduced, and then improve motor speed, running efficiency.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in detail:
Fig. 1 is the utility model theory diagram;
Fig. 2 is the concrete connection layout of bridge drive circuit;
Fig. 3 is for shortening the concrete connection layout of time generator circuit;
Fig. 4 is the concrete connection layout of pulse modulation generator circuit;
Fig. 5 is the concrete connection layout of Hall element circuit.
[embodiment]
Referring to Fig. 1, a kind of electromagnetic torque pulsation suppression device of brshless DC motor, comprise DC power supply, brshless DC motor (indicating the circle symbol of M among the figure) and be located at Hall element on the brshless DC motor, described brshless DC motor is driven by bridge drive circuit, the position signalling output of described Hall element connected the pulse modulation generator and reduced time generator, described reduced time, the signal output part of generator connected the pulse modulation generator, and described pulse modulation generator signal output has connected bridge drive circuit.Hall element on brshless DC motor, with the positional information of rotor magnet pass to the pulse modulation generator and reduced time generator, to produce corresponding pwm signal and reduced time T signal, obtain the control signal of motor after these two signal stacks, with the control bridge drive circuit, make the stator current before and after the commutation all reduce slowly and increase, and be zero at the electric current of commutation point.
Referring to Fig. 2-5, described reduced time, generator comprised control chip I U1, control chip I U1 signal output part after a triode Q1 amplifies, connected diode D1, D2 and the described pulse modulation generator of negative pole comprised control chip II U2, described control chip II U2 exports two groups of pwm signals, be respectively two groups of PWM0, OUT0 and PWM1 and OUT1, wherein, the output signal PWM1 of described pulse modulation generator has been connected the positive pole of diode D1, D2 with PWM0.
Described bridge drive circuit comprises driving chip and field effect transistor, and described driving chip input has connected the pwm signal output of pulse modulation generator, and output has connected field effect transistor, and described field effect transistor connects motor.Described field effect transistor has two groups of four branches, is respectively Q2, Q3 and Q4, Q5, and described driving chip has two to be respectively U3, U4, connects two groups of field effect transistor Q2, Q3, Q4, Q5 respectively.
Described Hall element is exported two groups of position signalling H1, H2, and the output of two position signallings connects the filter circuit that resistance and electric capacity R1, C1 and R2, C2 serial connection form respectively.
Hall element on brshless DC motor, positional information H1 with rotor magnet, H2 is through R1, R2, C1, after the filter circuit filtering that C2 forms, deliver to control chip I U1 and control chip II U2, wherein control chip II U2 produces the required pwm signal of bridge drive circuit, be respectively: PWM0, two groups of OUT0 and PWM1 and OUT1, control chip I U1 then produces scaled-back time T signal, because the driving force deficiency of this signal, so after amplifying through triode Q5 earlier, again by diode D1, D2 is connected to PWM0 and PWM1 signal end, to carry out the signal stack, the driving chip U3 of last bridge drive circuit, U4 obtains complete control signal, and pass through by 4 field effect transistor Q2, Q3, Q4, the drive circuit that Q5 forms, the stator current of control brshless DC motor, make this electric current before and after commutation, all reduce slowly and increase, and the electric current at commutation point is zero, wherein reduced time T signal is according to rotating speed of motor, number of poles, load decides, and effect is best when stator current changes with the rule of sine or near sinusoidal.
Claims (7)
1. the electromagnetic torque pulsation suppression device of a brshless DC motor, comprise DC power supply, brshless DC motor and be located at Hall element on the brshless DC motor, described brshless DC motor is driven by bridge drive circuit, it is characterized in that: the position signalling output of described Hall element connected the pulse modulation generator and reduced time generator, described reduced time, the signal output part of generator connected the pulse modulation generator, and described pulse modulation generator signal output has connected bridge drive circuit.
2. the electromagnetic torque pulsation suppression device of brshless DC motor according to claim 1, it is characterized in that: described reduced time generator comprise the control chip I, control chip I (U1) signal output part connected diode (D1, D2) and negative pole, described pulse modulation generator pwm signal output has connected the positive pole of diode (D1, D2).
3. the electromagnetic torque pulsation suppression device of brshless DC motor according to claim 2 is characterized in that: described control chip I (U1) signal output part has connected the negative pole of diode (D1, D2) after a triode (Q1) amplifies.
4. the electromagnetic torque pulsation suppression device of brshless DC motor according to claim 3, it is characterized in that: described pulse modulation generator has comprised control chip II (U2), two groups of pwm signals of described control chip II (U2) output.
5. according to the electromagnetic torque pulsation suppression device of claim 1 or 4 described brshless DC motors, it is characterized in that: described bridge drive circuit comprises driving chip and field effect transistor, described driving chip input has connected the pwm signal output of pulse modulation generator, output has connected field effect transistor, and described field effect transistor connects motor.
6. the electromagnetic torque pulsation suppression device of brshless DC motor according to claim 5, it is characterized in that: described field effect transistor has two groups of four branches, and described driving chip has two, connects two groups of field effect transistor respectively.
7. according to the electromagnetic torque pulsation suppression device of claim 1 or 6 described brshless DC motors, it is characterized in that: described Hall element is exported two groups of position signallings, and the output of two position signallings connects the filter circuit that resistance and capacitance series form respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200676208U CN203057050U (en) | 2013-02-05 | 2013-02-05 | Electromagnetic torque ripple inhibition device for brushless direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200676208U CN203057050U (en) | 2013-02-05 | 2013-02-05 | Electromagnetic torque ripple inhibition device for brushless direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057050U true CN203057050U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200676208U Withdrawn - After Issue CN203057050U (en) | 2013-02-05 | 2013-02-05 | Electromagnetic torque ripple inhibition device for brushless direct current motor |
Country Status (1)
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| CN (1) | CN203057050U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107751A (en) * | 2013-02-05 | 2013-05-15 | 睿能机电有限公司 | Electromagnetic torque pulsation suppressing device of brushless direct current motor |
| WO2015143737A1 (en) * | 2014-03-25 | 2015-10-01 | 睿能机电有限公司 | Efficiency improving apparatus for brushless direct-current motor |
-
2013
- 2013-02-05 CN CN2013200676208U patent/CN203057050U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107751A (en) * | 2013-02-05 | 2013-05-15 | 睿能机电有限公司 | Electromagnetic torque pulsation suppressing device of brushless direct current motor |
| CN103107751B (en) * | 2013-02-05 | 2014-01-08 | 睿能机电有限公司 | Electromagnetic torque pulsation suppressing device of brushless direct current motor |
| WO2015143737A1 (en) * | 2014-03-25 | 2015-10-01 | 睿能机电有限公司 | Efficiency improving apparatus for brushless direct-current motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130710 Effective date of abandoning: 20140108 |
|
| RGAV | Abandon patent right to avoid regrant |