CN202495903U - Brushless dc motor driver with medium voltage and high rotating speed - Google Patents
Brushless dc motor driver with medium voltage and high rotating speed Download PDFInfo
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- CN202495903U CN202495903U CN2012201366967U CN201220136696U CN202495903U CN 202495903 U CN202495903 U CN 202495903U CN 2012201366967 U CN2012201366967 U CN 2012201366967U CN 201220136696 U CN201220136696 U CN 201220136696U CN 202495903 U CN202495903 U CN 202495903U
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Abstract
The utility model provides a brushless dc motor driver with medium voltage and high rotating speed, which drives motor rotation via high-frequency PWM modulation signals. A motor transmits acquired rotor information of the motor to an MCU microprocessor through a detection circuit, and the MCU microprocessor can accurately acquire rotor position signals and PWM duty-ratio adjusting signals by adopting sampling signals, wherein the frequencies of the sampling signals are no less than 120 KHz, and the frequencies of the PWM duty-ratio adjusting signals are no less than 1 KHz. By controlling the duty ratio of the PWM modulation signals, a system can accurately control the rotation speed of the motor. To enable a MOSFET device in an inversion circuit to work normally under high switching frequency, a gate driving circuit is added in the front terminal of the inversion circuit, wherein the gate driving circuit can rapidly drive conduction and disconnection of the MOSFET. Thus, the MOSFET can be rapidly conducted or disconnected under driving of the high-frequency PWM modulation signals. The brushless dc motor driver is not only simple in structure, but also has good controlling features and high working efficiency, thereby improving the maximum rotating speed of the motor.
Description
Technical field
The utility model relates to a kind of middle high rotating speed brshless DC motor driver of pressing.
Background technology
The brush direct current machine is arranged, and it has characteristics such as torque is big, mechanical property is hard, efficient height, but because its rotating speed of existence of brush and commutator is arranged generally is not very high.Though it is very high that the rotating speed of induction machine can reach, the torsional moment of this motor is generally all smaller.And brshless DC motor is not owing to there is the restriction of brush and commutator; It has had the big torsional moment that the brush direct current machine is arranged, harder mechanical property, higher efficient and the high-revolving characteristics of induction machine concurrently, thereby brshless DC motor has become and has most one of motor product of development prospect.Common pot motor controller majority changes the driving voltage frequency through frequency converter to be realized, this frequency converter has that efficient is low, the not high shortcoming of control motor speed.At present, domestic research to the brshless DC motor driver mainly concentrates on middle low speed brshless DC motor driver aspect, and it is few to relate to the research of high rotating speed brshless DC motor driver.In press high rotating speed brshless DC motor driver mainly be through select to have the power electronic device of higher switching frequency and withstand voltage, comparatively advanced hardware circuit design and rational more control algolithm realize.
Summary of the invention
The utility model purpose is to provide a kind of middle high rotating speed brshless DC motor driver of pressing; It adopts pulse modulation technology that brshless DC motor is controlled, and its overall structure is simple, and control characteristic is good; High efficiency has improved the maximum speed of driver may command motor.
The technical scheme that the utility model provides is:
Press high rotating speed brshless DC motor driver in a kind of; It comprises MCU microprocessor, high speed photo coupling circuit, gate drive circuit, inverter circuit, motor, testing circuit, rectification circuit; Said MCU microprocessor sends pulse-width signal and delivers to the high speed photo coupling circuit; Said high speed photo coupling circuit is used for gate drive circuit and MCU microprocessor are isolated; Said gate drive circuit sends drive control signal according to received pulse-width signal, and said drive control signal is sent into inverter circuit, and AC power is imported inverter circuit through after the rectification of rectification circuit; Inverter circuit sends driving voltage according to received drive control signal and sends into motor in order to drive motors work, and said testing circuit detects rotating speed of motor signal and motor rotor position signal and the gained signal is sent to the MCU microprocessor.
The position that system just can detect rotor through testing circuit again by MCU microprocessor decision commutation constantly, calculate rotor speed; Send the pulse-width signal (PWM modulation signal) that is used to control spinner velocity accordingly then; The PWM modulation signal is through getting final product the conducting and the shutoff of MOSFET device in the fast driving inverter circuit behind the gate drive circuit; AC power becomes DC power supply after handling through the rectification of rectification circuit; The PWM modulation signal exported according to gate drive circuit of inverter circuit sends driving voltage and then drive motors work then; Guarantee machine operation under the stable rotating speed condition, and rotating speed can be by the duty recently accurately control of MCU microprocessor through control PWM modulation signal.
For technique scheme, as replenishing, what electronic device was selected for use in the said inverter circuit is the MOSFET device with higher drive, and the sample frequency of said testing circuit is not less than 120KHz, and the frequency of PWM modulation signal is not less than 1KHz.
As replenishing, said high speed photo coupling circuit comprises high-speed photoelectric coupler, and the speed of said high-speed photoelectric coupler is not less than 10Mbit/s.
Than solution of the prior art, the utility model advantage is:
1. the utility model is through the PWM modulation signal drive motors of high frequency.Motor through testing circuit gather to rotor information pass to the MCU microprocessor; The sampled signal that the MCU microprocessor adopts frequency to be not less than 120KHz can collect the position signalling of rotor exactly; The MCU microprocessor produces the PWM duty cycle adjustment signal that frequency is not less than 1KHz; System can recently accurately control rotating speed of motor through the duty of control PWM modulation signal; High frequency sampling and low frequency control have been realized to motor speed; For make MOSFET device in the inverter circuit can be under high switching frequency operate as normal, having added at the inverter circuit front end can fast driving MOSFET conducting or the gate drive circuit of shutoff, power MOSFET just can conducting fast or shutoff under the driving of the PWM of high frequency modulation signal like this.The utility model is not only simple in structure, and control characteristic is good, high efficiency, makes the maximum speed of motor be improved;
2. the utility model has added the high speed photo coupling circuit between gate drive circuit and MCU microprocessor; The high speed photo coupling circuit is kept apart the PWM modulation signal and the strong power part of the output of MCU microprocessor; Reduced the interference of strong power part, improved the stability and the reliability of system works control signal.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 is the structural principle block diagram of the utility model.
Embodiment
Below in conjunction with specific embodiment such scheme is further specified.Should be understood that these embodiment are used to the present invention is described and are not limited to limit scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
Press high rotating speed brshless DC motor driver during present embodiment is described; It comprises MCU microprocessor, high speed photo coupling circuit, gate drive circuit, inverter circuit, motor, testing circuit, rectification circuit; Said MCU microprocessor sends pulse-width signal and delivers to the high speed photo coupling circuit; Said high speed photo coupling circuit is used for gate drive circuit and MCU microprocessor are isolated; Said gate drive circuit sends drive control signal according to received pulse-width signal; Said drive control signal is sent into inverter circuit; AC power is handled back input inverter circuit through the rectification of rectification circuit, and inverter circuit sends driving voltage according to received drive control signal and sends into motor in order to drive motors work, and said testing circuit detects rotating speed of motor signal and motor rotor position signal and the gained signal is sent to the MCU microprocessor.
What electronic device was selected for use in the said inverter circuit is the MOSFET device with higher drive.
Motor is delivered to the MCU microprocessor to the motor rotor position information that collects through testing circuit.Adopt the interruption of two kinds of different priorities to realize that sample frequency is interrupted (sampled signal) and pulse duty factor is regulated interruption (PWM duty cycle modulated signal) at the MCU microprocessor.The interruption of higher priority can produce the sampled signal that frequency is not less than 120KHz; Can collect the position signalling of rotor accurately through the sampled signal of this high frequency; The accurate fast commutation purpose constantly of confirming motor not only can be reached, the real-time collection of motor speed can also be realized; The interruption generating of lower priority be the PWM modulation signal that frequency is not less than 1kHz, system can recently accurately control rotating speed of motor through the duty of control PWM modulation signal.Like this system just can detect rotor through testing circuit the position again by MCU microprocessor decision commutation constantly, calculate rotor speed; Send corresponding speed control order then; Regulate the amplitude and the frequency of the motor driven voltage of inverter circuit output, finally reach the purpose of regulating motor speed.
Because the MOSFET device in the inverter circuit needs higher driving voltage and certain capacitive input impedance is arranged; Therefore to utilize a little drive source of internal resistance that grid capacitance is discharged and recharged fast; To guarantee that gate-source voltage has enough steep edge, front and back; Promptly in the as far as possible short time, make gate-source voltage reach more than the threshold values or reduce to below the threshold values, achieve the purpose of quick conducting or shutoff.For making the MOSFET device satisfy above-mentioned condition, the inverter circuit front end added can fast driving MOSFET device gate drive circuit, power MOSFET just can conducting fast or shutoff under the driving of the PWM of high frequency chopping signal like this.
Between gate drive circuit and MCU microprocessor, added the high speed photo coupling circuit; Keep apart the PWM modulation signal and the strong power part of the output of MCU microprocessor; Reduced the interference of strong power part like this, improved the stability and the reliability of system works control signal.Because the pwm signal frequency of output is up to more than the 120KHz; Its waveform can produce distortion to a certain degree when the pwm signal of high frequency passed through photoelectric coupled circuit; When adopted the high more this distortion of speed of photoelectrical coupler more little; Therefore the more little influence to system of PWM wave distortion is also accordingly more little, and what the minimum the utility model of the influence of system is adopted for the distortion that makes the pwm signal waveform is the high-speed photoelectric coupler that speed is not less than 10Mbit/s.
To sum up, present embodiment is through the PWM modulation signal drive motors of high frequency.The rotor information MCU microprocessor that arrives that motor is gathered through the testing circuit handle; The sampled signal that the MCU microprocessor adopts frequency to be not less than 120KHz can collect the position signalling of rotor exactly; The MCU microprocessor produces the PWM duty cycle adjustment signal that frequency is not less than 1KHz; System can recently accurately control rotating speed of motor through the duty of control PWM modulation signal; High frequency sampling and low frequency control have been realized to motor speed; For for make MOSFET device in the inverter circuit can be under high switching frequency operate as normal, the inverter circuit front end added can fast driving MOSFET gate drive circuit, power MOSFET just can conducting fast or shutoff under the driving of the PWM of high frequency modulation signal like this.The utility model is not only simple in structure, and control characteristic is good, high efficiency, makes the maximum speed of motor be improved.
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (5)
1. press high rotating speed brshless DC motor driver in one kind; It is characterized in that; It comprises MCU microprocessor, high speed photo coupling circuit, gate drive circuit, inverter circuit, motor, testing circuit, rectification circuit; Said MCU microprocessor sends pulse-width signal and delivers to the high speed photo coupling circuit; Said high speed photo coupling circuit is used for gate drive circuit and MCU microprocessor are isolated; Said gate drive circuit sends drive control signal according to received pulse-width signal, and said drive control signal is sent into inverter circuit, and AC power is handled back input inverter circuit through the rectification of rectification circuit; Inverter circuit sends driving voltage according to received drive control signal and sends into motor in order to drive motors work, and said testing circuit detects rotating speed of motor signal and motor rotor position signal and the gained signal is sent to the MCU microprocessor.
2. press high rotating speed brshless DC motor driver in according to claim 1, it is characterized in that what electronic device was selected for use in the said inverter circuit is the MOSFET device with higher drive.
3. press high rotating speed brshless DC motor driver in according to claim 1, it is characterized in that the sample frequency of said testing circuit is not less than 120KHz.
4. press high rotating speed brshless DC motor driver in according to claim 1, it is characterized in that the frequency of said PWM modulation signal is not less than 1KHz.
5. press high rotating speed brshless DC motor driver in according to claim 1, it is characterized in that said high speed photo coupling circuit comprises high-speed photoelectric coupler, the speed of said high-speed photoelectric coupler is not less than 10Mbit/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201366967U CN202495903U (en) | 2012-03-31 | 2012-03-31 | Brushless dc motor driver with medium voltage and high rotating speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201366967U CN202495903U (en) | 2012-03-31 | 2012-03-31 | Brushless dc motor driver with medium voltage and high rotating speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495903U true CN202495903U (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201366967U Expired - Fee Related CN202495903U (en) | 2012-03-31 | 2012-03-31 | Brushless dc motor driver with medium voltage and high rotating speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202495903U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638209A (en) * | 2012-03-31 | 2012-08-15 | 苏州大一装备科技有限公司 | Medium-voltage high-rotation-speed brushless direct-current motor driver |
| CN106385164A (en) * | 2016-09-23 | 2017-02-08 | 江西洪都航空工业集团有限责任公司 | Low-voltage high-power driving circuit for servo motor control |
| GB2566292A (en) * | 2017-09-07 | 2019-03-13 | Delphi Automotive Systems Lux | Method of controlling a brushless DC motor |
-
2012
- 2012-03-31 CN CN2012201366967U patent/CN202495903U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638209A (en) * | 2012-03-31 | 2012-08-15 | 苏州大一装备科技有限公司 | Medium-voltage high-rotation-speed brushless direct-current motor driver |
| CN106385164A (en) * | 2016-09-23 | 2017-02-08 | 江西洪都航空工业集团有限责任公司 | Low-voltage high-power driving circuit for servo motor control |
| GB2566292A (en) * | 2017-09-07 | 2019-03-13 | Delphi Automotive Systems Lux | Method of controlling a brushless DC motor |
| GB2566292B (en) * | 2017-09-07 | 2020-03-04 | Delphi Automotive Systems Lux | Method of controlling a brushless DC motor |
| US11356042B2 (en) | 2017-09-07 | 2022-06-07 | Delphi Automotive Systems Luxembourg Sa | Method of controlling a brushless DC motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20190331 |