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Brushless DC motor sensorless rotor position correction method

A brushed DC motor, sensor rotor technology, applied in electronic commutator, torque ripple control and other directions, can solve problems such as system efficiency reduction, motor out-of-step fault, current fluctuation intensification, etc., to improve commutation accuracy and efficiency. , the effect of reducing torque ripple

Inactive Publication Date: 2018-02-09
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 DC motor sensorless rotor position correction method
  • Brushless DC motor sensorless rotor position correction method
  • Brushless DC motor sensorless rotor position correction method

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Experimental program
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specific Embodiment

[0033] Specific embodiments: a sensorless brushless DC motor control system with a working voltage of 30V is used as an object for test verification.

[0034] 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.

[0035]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.

[0036] The specific implementation of zero-crossing sampling and commutation algorithm is according to Figure 4 shown in the flowchart.

[0037] The specific implementation steps of this method are as follows, taking the B-phase terminal voltage as an example:

[0038] Step 1: In the initialization of the system control ...

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Abstract

The invention relates to a brushless DC motor sensorless rotor position correction method. The method includes the following steps: testing the voltage values of the three phases of voltages Ua, Ub and Uc of a motor when counting to the 3 / 4 duty ratio time moment in each chopper cycle; calculating the voltage deviation of any voltage value in a rising interval and in a falling interval; and determining whether the brushless DC motor changes phases normally according to the voltage deviation and adopting PI regulation. The method can help to improve the phase change precision of motors, reducethe torque ripple, improve the efficiency of motors, and avoid the out-of-step failure of motors caused by serious phase lag.

Description

technical field [0001] The invention relates to a position sensorless brushless direct current motor control technology, which relates to a brushless direct current motor rotor position correction method without a position sensor. Background technique [0002] Brushless DC motor (BLDCM) not only has the advantages of simple control and good speed regulation performance of DC motor, but also has the advantages of reliable operation and convenient maintenance of AC motor, so its application range covers aviation, aerospace, transportation, home appliances and many other fields. [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 sensing is a device used to detect the position of the motor rotor relative to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/15H02P6/18H02P6/10
Inventor 马瑞卿张煜辰薛耀庭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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