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High-power brushless DC motor torque ripple control device and control method thereof

A brush DC motor and torque fluctuation technology, which is applied in the direction of torque ripple control, can solve the problems of high-power brushless DC motor torque fluctuation, etc., and achieve the effect of flexible control method, strong practicability and low cost

Active Publication Date: 2017-09-08
江苏开璇智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a high-power brushless DC motor torque fluctuation control device. In view of the obvious problem of high-power brushless DC motor torque fluctuation, this case effectively controls the current control and voltage control. The torque fluctuation of high-power brushless DC motors takes into account the influence of power grid voltage fluctuations on motor torque fluctuations. By timely adjusting the bus voltage and controlling the line current and phase current, it can effectively prevent brushless DC motors from Torque fluctuations caused by grid voltage fluctuations during non-commutation periods, while preventing commutation torque fluctuations caused by inconsistent phase current change rates during commutation periods

Method used

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  • High-power brushless DC motor torque ripple control device and control method thereof

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Effect test

Embodiment 1

[0035] The present invention provides a high-power brushless DC motor torque fluctuation control device, such as figure 1 As shown, it includes an energy storage module 1 , an inverter module 2 , a bus current detection module 3 , a bus voltage detection module 4 , a phase current detection module 5 and a single chip microcomputer 6 .

[0036] The input end of the inverter module 2 is connected to the power supply, and the output end of the inverter module 2 is connected to the current input end of the DC motor.

[0037] An energy storage module 1, which includes a battery energy storage unit, a first branch and a second branch, the output positive pole of the battery energy storage unit is respectively connected to the first branch and the second branch, and the first branch is routed to The sequentially connected first normally open relay KM11, the first normally closed relay KM12 and the step-down chopper circuit are composed, and the second branch is composed of the sequen...

Embodiment 2

[0047] On the basis of Embodiment 1, a primary voltage stabilizing circuit is also connected to both ends of the terminal capacitor C1, such as figure 2 As shown, the secondary voltage stabilizing circuit includes a third normally open relay KM3, an adjustable inductance L3, a third diode D3, a double-arm bridge composed of four transistors Q1-Q4, and a double-arm bridge connected in sequence. The slow charging capacitor C2 between the arm bridges, the other end of the third normally open relay KM3 is connected to the positive end of the terminal capacitor C1, and the first end of the double arm bridge is connected to the third diode The cathode terminal of D3, the second terminal of the double-arm bridge is connected to the negative terminal of the terminal capacitor C1, and the control terminals of each triode are connected to the single-chip microcomputer 6 .

[0048] The secondary voltage stabilizing circuit in this embodiment has a simple structure and low cost. When the...

Embodiment 3

[0050] A control method for a high-power brushless DC motor torque fluctuation control device, comprising the following steps:

[0051] Step 1. When the system is turned on, the brushless DC motor is not started. The bus voltage detection module 4 detects the bus voltage between the primary terminal capacitors C1 in each algorithm cycle. After 100 cycles of detection, the single chip computer 6 calculates the average bus voltage U dcavg ;

[0052] Step 2: Start the brushless DC motor. During the non-commutation period of the brushless DC motor, the bus voltage detection module 4 detects the real-time bus voltage U' between the primary terminal capacitors C1 in each algorithm cycle dc , the bus current detection module also detects the bus current once in each algorithm cycle, and after 50 cycle detections, the single-chip microcomputer 6 calculates the average bus current I 0avg , and at the same time, in each algorithm cycle, the real-time bus voltage U' is judged by the sin...

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Abstract

The invention discloses a high-power brushless DC motor torque ripple control device which comprises an energy storage module, an inversion module, a bus current detection module, a bus voltage detection module, a phase current detection module and a single-chip microcomputer. The invention further discloses a control method of the high-power brushless DC motor torque ripple control device. Comprehensive consideration is given from the two aspects of voltage control and current control, and different methods are adopted to control the torque ripple in a non-commutation period and a commutation period. The control method is flexible, not only can effectively prevent the output torque ripple of a brushless DC motor due to driving system overvoltage / undervoltage caused by grid fluctuations, but also can ensure the commutation torque ripple caused by the commutation process of the brushless DC motor to be miniaturized at the same time.

Description

technical field [0001] The present invention relates to the technical field of brushless direct current motor control, more specifically, the present invention relates to a high-power brushless direct current motor torque fluctuation control device and control method. Background technique [0002] As a new type of mechatronics product, brushless DC motor has been widely used in industrial control, aerospace, CNC machine tools, micro-special processing and other fields. Due to the inductance of the motor winding, the winding current cannot change instantaneously during commutation, but has a changing process. Therefore, the current waveform is not an ideal rectangular waveform, but approximates a trapezoidal wave, which causes current fluctuations in the motor, causing Commutation torque ripple. For a brushless motor with good manufacturing quality, its cogging torque ripple and harmonic torque ripple are small, but the commutation torque ripple becomes its main problem, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 储建华韦汉培王刚扶文树左昱昱
Owner 江苏开璇智能科技有限公司
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