CN104300854A - Brushless direct current motor drive circuit based on Buck convertor - Google Patents
Brushless direct current motor drive circuit based on Buck convertor Download PDFInfo
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- CN104300854A CN104300854A CN201410624575.0A CN201410624575A CN104300854A CN 104300854 A CN104300854 A CN 104300854A CN 201410624575 A CN201410624575 A CN 201410624575A CN 104300854 A CN104300854 A CN 104300854A
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Abstract
The invention relates to a brushless direct current motor drive circuit based on a Buck convertor, belongs to the field of motor control, and aims to solve the problem that faults easily occurs when an existing inverter carries out PWM (Pulse-Width Modulation) to regulate the rotating speed of a motor. The brushless direct current motor drive circuit based on the Buck convertor is characterized in that as the Buck convertor is additionally arranged on an existing drive circuit, single tube modulation is performed by using a power tube in a chopper voltage regulation circuit of the Buck convertor and replaces multi-tube modulation of the existing inverter; not only can the inverter be replaced to carry out the PWM so as to regulate the rotating speed of the motor, but also an LC filtering effect can be realized; the impact caused by high-frequency impulse generated in the inversion process to a pre-stage circuit and a post-stage circuit is relieved, so that the current of a motor stator is more stable, and the torque pulsation is weakened, therefore, the fault rate is reduced by 50 percent, and a control system is safer and more stable in running. The brushless direct current motor drive circuit is suitable for driving the brushless motor.
Description
Technical field
The invention belongs to Motor Control Field, particularly relate to a kind of drive circuit of brshless DC motor.
Background technology
Brushless, permanently excited direct current motor (Brushless DC motor is called for short BLDC), have the speed adjusting performance compared favourably with direct current machine, stable performance, circuit is simple, controls precisely.
Electric machine control system normally regulates the make-and-break time duty ratio of three-phase full-bridge inverter power tube by PWM (pulse width modulation) technology, thus regulates motor speed, generally all needs multiple power tube to carry out high-frequency operation simultaneously.While inverter power pipe carries out motor commutation, also need the high-frequency PWM pulse-width modulation continued, make it to become the weak link very easily broken down in work.
Summary of the invention
The present invention be in order to solve existing inverter carry out PWM pulse-width modulation to regulate motor speed time, the problem easily broken down, now provides the brushless direct current motor drive circuit based on Buck converter.
Based on the brushless direct current motor drive circuit of Buck converter, it comprises: power supply, Buck converter, electric machine controller and inverter;
The positive pole of power supply connects the forward voltage input of Buck converter, and the negative pole of power supply connects the negative pole of Buck converter;
The converter pulses signal output part of electric machine controller connects the pulse signal input terminal of Buck converter;
The forward voltage output of Buck converter connects the positive pole of inverter, and the negative pole of Buck converter connects the negative pole of inverter;
A pulse signal output end of electric machine controller connects a pulse signal input terminal of inverter, No. two pulse signal output ends of electric machine controller connect No. two pulse signal input terminals of inverter, No. three pulse signal output ends of electric machine controller connect No. three pulse signal input terminals of inverter, No. four pulse signal output ends of electric machine controller connect No. four pulse signal input terminals of inverter, No. five pulse signal output ends of electric machine controller connect No. five pulse signal input terminals of inverter, No. six pulse signal output ends of electric machine controller connect No. six pulse signal input terminals of inverter.
Brushless direct current motor drive circuit based on Buck converter of the present invention, on the basis of existing drive circuit, add Buck converter, utilize the power tube in Buck converter voltage regulation circuit of chopping to carry out single tube modulation, instead of the multitube modulation of existing inverter.Inverter can not only be replaced to carry out PWM pulse-width modulation to regulate motor speed, also possesses LC filter action, the high-frequency impulse produced in alleviation reversals is to the impact of front stage circuit, make motor stator electric current more steady, weaken torque pulsation, thus make failure rate reduce 50%, control system is run safer, stable.The present invention is applicable to drive brshless DC motor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the brushless direct current motor drive circuit based on Buck converter of the present invention.
Embodiment
Embodiment one: illustrate present embodiment, the brushless direct current motor drive circuit based on Buck converter described in present embodiment with reference to Fig. 1, it comprises: power supply U, Buck converter 1, electric machine controller 2 and inverter 3;
The positive pole of power supply U connects the forward voltage input of Buck converter 1, and the negative pole of power supply U connects the negative pole of Buck converter 1;
The converter pulses signal output part of electric machine controller 2 connects the pulse signal input terminal of Buck converter 1;
The forward voltage output of Buck converter 1 connects the positive pole of inverter 3, and the negative pole of Buck converter 1 connects the negative pole of inverter 3;
A pulse signal output end of electric machine controller 2 connects a pulse signal input terminal of inverter 3, No. two pulse signal output ends of electric machine controller 2 connect No. two pulse signal input terminals of inverter 3, No. three pulse signal output ends of electric machine controller 2 connect No. three pulse signal input terminals of inverter 3, No. four pulse signal output ends of electric machine controller 2 connect No. four pulse signal input terminals of inverter 3, No. five pulse signal output ends of electric machine controller 2 connect No. five pulse signal input terminals of inverter 3, No. six pulse signal output ends of electric machine controller 2 connect No. six pulse signal input terminals of inverter 3.
The three-phase windings link of inverter 3, when practical application, is connected with the three-phase windings of brshless DC motor 4 by present embodiment respectively, thus drives brshless DC motor 4.Namely the U phase winding link of inverter 3 connects the U phase winding of brshless DC motor 4, and the V phase winding link of inverter 3 connects the V phase winding of brshless DC motor 4, and the W phase winding link of inverter 3 connects the W phase winding of brshless DC motor 4.
Embodiment two: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment one, in present embodiment, described Buck converter 1 comprises: a converter diode D1, No. two converter diode D2, inverter power pipe TV0, inductance L and electric capacity C;
The negative pole of a converter diode D1 is connected with the collector electrode of inverter power pipe TV0, and simultaneously as the forward voltage input of Buck converter 1, the positive pole of a converter diode D1, the emitter of inverter power pipe TV0, the negative pole of No. two converter diode D2 is connected with one end of inductance L simultaneously, the other end of inductance L is connected with one end of electric capacity C, and simultaneously as the forward voltage output of Buck converter 1, the base stage of inverter power pipe TV0 is as the pulse signal input terminal of Buck converter 1, the positive pole of No. two converter diode D2 and the other end of electric capacity C are simultaneously as the negative pole of Buck converter 1.
Buck converter 1 described in present embodiment can replace inverter 3 to carry out PWM voltage modulated, makes inverter 3 responsible commutations, thus to alleviate in inverter 3 and not only commutate but also the burden of pressure regulation.
Inductance L in Buck converter 1 described in present embodiment and electric capacity C form LC filter jointly, and the high frequency harmonic signals that this LC filter can produce in filtering inverter 3 commutation process is to the impact of front stage circuit.Due to the buffering afterflow effect of inductance L, make bus current continuous and stable, and then improve phase current waveform, make electromagnetic torque more stable.
Embodiment three: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment one, in present embodiment, inverter 3 comprises: power tube VT1, No. two power tube VT2, No. three power tube VT3, No. four power tube VT4, No. five power tube VT5, No. six power tube VT6, diode 3-1, No. two diode 3-2, No. three diode 3-3, No. four diode 3-4, No. five diode 3-5 and No. six diode 3-6;
The base stage of a power tube VT1 is as a pulse signal input terminal of inverter 3, the base stage of No. two power tube VT2 is as No. two pulse signal input terminals of inverter 3, the base stage of No. three power tube VT3 is as No. three pulse signal input terminals of inverter 3, the base stage of No. four power tube VT4 is as No. four pulse signal input terminals of inverter 3, the base stage of No. five power tube VT5 is as No. five pulse signal input terminals of inverter 3, and the base stage of No. six power tube VT6 is as No. six pulse signal input terminals of inverter 3;
The collector electrode of a power tube VT1, the negative pole of a diode 3-1, the collector electrode of No. three power tube VT3, the negative pole of No. three diode 3-3, the collector electrode of No. five power tube VT5 are connected with the negative pole of No. five diode 3-5, and simultaneously as the positive pole of inverter 3;
The emitter of No. two power tube VT2, the positive pole of No. two diode 3-2, the emitter of No. four power tube VT4, the positive pole of No. four diode 3-4, the emitter of No. six power tube VT6 are connected with the positive pole of No. six diode 3-6, and simultaneously as the negative pole of inverter 3;
The collector electrode of the emitter of a power tube VT1, the positive pole of a diode 3-1, No. four power tube VT4 is connected with the negative pole of No. four diode 3-4, and simultaneously as the U phase winding link of inverter 3;
The collector electrode of the emitter of No. three power tube VT3, the positive pole of No. three diode 3-3, No. six power tube VT6 is connected with the negative pole of No. six diode 3-6, and simultaneously as the V phase winding link of inverter 3;
The collector electrode of the emitter of No. five power tube VT5, the positive pole of No. five diode 3-5, No. two power tube VT2 is connected with the negative pole of No. two diode 3-2, and simultaneously as the W phase winding link of inverter 3.
Embodiment four: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment one, two or three, and in present embodiment, described power supply U is DC power supply.
Embodiment five: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment two, and in present embodiment, described inductance L is afterflow inductance.
Embodiment six: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment two, and in present embodiment, described electric capacity C is filter capacitor.
Embodiment seven: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment two, in present embodiment, No. two converter diode D2 are fly-wheel diode.
Embodiment eight: present embodiment is described further the brushless direct current motor drive circuit based on Buck converter described in embodiment one, two or three, and in present embodiment, described inverter 3 is three-phase bridge type converter.
The speed computing formula of brshless DC motor is:
In formula, U
dbusbar voltage, R
afor motor stator resistance, i
afor motor stator electric current, K
εback EMF coefficient, only relevant with motor body structure.
As can be seen from above formula, when stator current is certain, regulate the busbar voltage of inverter power supply end just can reach the object regulating motor speed.
Due to the buck circuit that Buck converter is a kind of DC-DC pressure regulation, by changing the duty ratio of power tube make-and-break time, the voltage swing of output can be changed.The present invention then replaces the PWM pulse-width modulation of three-phase bridge type converter by the duty ratio of inverter power pipe TV0 in control Buck translation circuit, and then realizes regulating brshless DC motor DC bus-bar voltage, thus regulates brshless DC motor rotating speed.In circuit shown in Fig. 1, three-phase bridge type converter only plays commutation, does not carry out PWM pulse-width modulation.
Brushless direct current motor drive circuit based on Buck converter of the present invention, in practical work process, electric machine controller 2 one aspect is according to 6 the power tubes applying trigger impulses of good commutation sequential prepared in advance respectively to inverter 3, and drive motors rotates; The trigger impulse of the variable duty ratio exported after the effect of inverter power pipe TV0 applying via controller rotational speed regulation on the other hand, realizes electric machine speed regulation effect.
Buck converter 1 utilizes the modulation of inverter power pipe TV0 single tube to instead of the multitube modulation of original inverter, and the work load of the inverter power pipe alleviated on the one hand, reduces failure rate, can reduce switching loss again simultaneously; On the other hand, Buck converter 1 self is with LC filter action, and the high-frequency harmonic pulse content of generation when many power tubes of having decayed to a great extent carry out pulse-width modulation simultaneously, reduces the impact to front stage circuit, and then improve motor torque ripple.
Claims (8)
1. based on the brushless direct current motor drive circuit of Buck converter, it is characterized in that, it comprises: power supply (U), Buck converter (1), electric machine controller (2) and inverter (3);
The positive pole of power supply (U) connects the forward voltage input of Buck converter (1), and the negative pole of power supply (U) connects the negative pole of Buck converter (1);
The converter pulses signal output part of electric machine controller (2) connects the pulse signal input terminal of Buck converter (1);
The forward voltage output of Buck converter (1) connects the positive pole of inverter (3), and the negative pole of Buck converter (1) connects the negative pole of inverter (3);
A pulse signal output end of electric machine controller (2) connects a pulse signal input terminal of inverter (3), No. two pulse signal output ends of electric machine controller (2) connect No. two pulse signal input terminals of inverter (3), No. three pulse signal output ends of electric machine controller (2) connect No. three pulse signal input terminals of inverter (3), No. four pulse signal output ends of electric machine controller (2) connect No. four pulse signal input terminals of inverter (3), No. five pulse signal output ends of electric machine controller (2) connect No. five pulse signal input terminals of inverter (3), No. six pulse signal output ends of electric machine controller (2) connect No. six pulse signal input terminals of inverter (3).
2. the brushless direct current motor drive circuit based on Buck converter according to claim 1, it is characterized in that, described Buck converter (1) comprising: a converter diode (D1), No. two converter diodes (D2), inverter power pipe (TV0), inductance (L) and electric capacity (C);
The negative pole of a converter diode (D1) is connected with the collector electrode of inverter power pipe (TV0), and simultaneously as the forward voltage input of Buck converter (1), the positive pole of a converter diode (D1), the emitter of inverter power pipe (TV0), the negative pole of No. two converter diodes (D2) is connected with one end of inductance (L) simultaneously, the other end of inductance (L) is connected with one end of electric capacity (C), and simultaneously as the forward voltage output of Buck converter (1), the base stage of inverter power pipe (TV0) is as the pulse signal input terminal of Buck converter (1), the positive pole of No. two converter diodes (D2) and the other end of electric capacity (C) are simultaneously as the negative pole of Buck converter (1).
3. the brushless direct current motor drive circuit based on Buck converter according to claim 1, it is characterized in that, inverter (3) comprising: a power tube (VT1), No. two power tubes (VT2), No. three power tubes (VT3), No. four power tubes (VT4), No. five power tubes (VT5), No. six power tubes (VT6), a diode (3-1), No. two diodes (3-2), No. three diodes (3-3), No. four diodes (3-4), No. five diodes (3-5) and No. six diodes (3-6);
The base stage of a power tube (VT1) is as a pulse signal input terminal of inverter (3), the base stage of No. two power tubes (VT2) is as No. two pulse signal input terminals of inverter (3), the base stage of No. three power tubes (VT3) is as No. three pulse signal input terminals of inverter (3), the base stage of No. four power tubes (VT4) is as No. four pulse signal input terminals of inverter (3), the base stage of No. five power tubes (VT5) is as No. five pulse signal input terminals of inverter (3), the base stage of No. six power tubes (VT6) is as No. six pulse signal input terminals of inverter (3),
The collector electrode of a power tube (VT1), the negative pole of a diode (3-1), the collector electrode of No. three power tubes (VT3), the negative pole of No. three diodes (3-3), the collector electrode of No. five power tubes (VT5) are connected with the negative pole of No. five diodes (3-5), and simultaneously as the positive pole of inverter (3);
The emitter of No. two power tubes (VT2), the positive pole of No. two diodes (3-2), the emitter of No. four power tubes (VT4), the positive pole of No. four diodes (3-4), the emitter of No. six power tubes (VT6) are connected with the positive pole of No. six diodes (3-6), and simultaneously as the negative pole of inverter (3);
The collector electrode of the emitter of a power tube (VT1), the positive pole of a diode (3-1), No. four power tubes (VT4) is connected with the negative pole of No. four diodes (3-4), and simultaneously as the U phase winding link of inverter (3);
The collector electrode of the emitter of No. three power tubes (VT3), the positive pole of No. three diodes (3-3), No. six power tubes (VT6) is connected with the negative pole of No. six diodes (3-6), and simultaneously as the V phase winding link of inverter (3);
The collector electrode of the emitter of No. five power tubes (VT5), the positive pole of No. five diodes (3-5), No. two power tubes (VT2) is connected with the negative pole of No. two diodes (3-2), and simultaneously as the W phase winding link of inverter (3).
4. the brushless direct current motor drive circuit based on Buck converter according to claim 1,2 or 3, is characterized in that, described power supply (U) is DC power supply.
5. the brushless direct current motor drive circuit based on Buck converter according to claim 2, is characterized in that, described inductance (L) is afterflow inductance.
6. the brushless direct current motor drive circuit based on Buck converter according to claim 2, is characterized in that, described electric capacity (C) is filter capacitor.
7. the brushless direct current motor drive circuit based on Buck converter according to claim 2, is characterized in that, No. two converter diodes (D2) are fly-wheel diode.
8. the brushless direct current motor drive circuit based on Buck converter according to claim 1,2 or 3, is characterized in that, described inverter (3) is three-phase bridge type converter.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104410341A (en) * | 2014-11-27 | 2015-03-11 | 江苏科技大学 | Low-speed torque ripple restraining device and restraining method based on direct current voltage adjustment |
| CN104753414A (en) * | 2015-03-20 | 2015-07-01 | 南京航空航天大学 | Buck circuit brushless direct current motor driving system and control method thereof |
| CN104836491A (en) * | 2015-04-30 | 2015-08-12 | 南京航空航天大学 | Brushless direct current motor driving system for capacitor-less direct-current converter |
| CN107276461A (en) * | 2017-06-09 | 2017-10-20 | 常州机电职业技术学院 | Drive control device and method for low-speed heavy-load working condition of brushless direct current motor |
| CN108768224A (en) * | 2018-06-14 | 2018-11-06 | 东华大学 | A kind of torque fluctuations method caused by reduction brshless DC motor commutation process |
| IT201900015860A1 (en) * | 2019-09-09 | 2021-03-09 | Torino Politecnico | Aircraft equipped with at least one Brushless DC motor |
| IT201900015857A1 (en) * | 2019-09-09 | 2021-03-09 | Torino Politecnico | Power supply and control device and method of a Brushless DC motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104410341A (en) * | 2014-11-27 | 2015-03-11 | 江苏科技大学 | Low-speed torque ripple restraining device and restraining method based on direct current voltage adjustment |
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| CN108768224A (en) * | 2018-06-14 | 2018-11-06 | 东华大学 | A kind of torque fluctuations method caused by reduction brshless DC motor commutation process |
| IT201900015860A1 (en) * | 2019-09-09 | 2021-03-09 | Torino Politecnico | Aircraft equipped with at least one Brushless DC motor |
| IT201900015857A1 (en) * | 2019-09-09 | 2021-03-09 | Torino Politecnico | Power supply and control device and method of a Brushless DC motor |
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