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Brushless direct current motor sensorless commutation position detection commutation method

A brush DC motor and sensor technology, which is applied in the field of position sensorless brushless DC motor control, can solve the problems of increased current fluctuation, reduced system efficiency, motor vibration, etc., and achieves the effect of accurate phase commutation and wide application

Inactive Publication Date: 2017-12-15
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

When the commutation of the brushless DC motor is inaccurate, it will cause the motor to shake, the current fluctuation will increase, and the system efficiency will decrease.

Method used

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  • Brushless direct current motor sensorless commutation position detection commutation method
  • Brushless direct current motor sensorless commutation position detection commutation method
  • Brushless direct current motor sensorless commutation position detection commutation method

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specific Embodiment

[0027] In the three-phase six-state brushless DC motor bus current detection circuit, the three-phase voltage of the motor is sent to the AD port of the DSP for detection after being filtered and amplified by the voltage sensor. It is especially emphasized that the filtering here only filters out the high-frequency clutter above the chopping frequency.

[0028] The control cycle of the control system software is 25uS (40kHz), the PWM chopping frequency is 15kHz, and the DSP uses TMS320F28335 of TI Company.

[0029] The specific implementation of zero-crossing sampling and commutation algorithm is according to Figure 4 Proceed as shown in the flowchart.

[0030] Step 1: In the initialization of the system control software, initialize the ADC module; there are two PWM modules, A and B, in the TMS320F28335 control chip, and set the A and B PWMs to synchronous mode; set the B PWM comparison event As an ADC interrupt trigger event: ADCTRL2.bit.EPWM_ENA_SEQ1=1.

[0031] Step 2: ...

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Abstract

The present invention relates to a brushless direct current motor sensorless commutation position detection commutation method. In the operation of a brushless direct current motor, the method comprises: measuring the voltage values of three-phase voltages Ua, Ub and Uc of a motor; detecting the moment of counter electromotive force of a non-conducting phase in the three phases passing through zero point at the 15 degrees after the previous commutation, namely a zero crossing point; and sending commutation signals to the motor for commutation at the 30-degree electric angle moment after the moment of the zero crossing point. The influence of peak voltage generated when commutation of the motor on the motor commutation can be avoided to realize accurate commutation of the motor. The brushless direct current motor sensorless commutation position detection commutation method is suitable for a high-voltage and larger-power brushless direct current motor control system and is also suitable for other brushless direct current motor control systems.

Description

technical field [0001] The invention belongs to the control technology of a brushless direct current motor without a position sensor, and relates to a commutation position detection and commutation method without a position sensor of a brushless direct current motor. Background technique [0002] Brushless DC motor (BLDCM) not only has the advantages of high operating efficiency and good speed regulation performance of DC motor, but also has the advantages of simple structure, reliable operation and convenient maintenance of AC motor. It is widely used in aviation, aerospace, transportation, home appliances and many other fields. Has been widely used. [0003] The basic composition of the brushless DC motor includes three parts: the motor body, the electronic commutation circuit and the rotor position sensor. The motor body is mainly composed of a stator and a rotor. The electronic commutation circuit generally consists of a drive part and a control part. Rotor position s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/14H02P6/15
CPCH02P6/14H02P6/15
Inventor 马瑞卿张煜辰薛耀庭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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