Motor control method and system based on hall sensor

A hall sensor, motor control technology, applied in control system, vector control system, motor generator control, etc., can solve problems such as angle error
CN110061673AActive Publication Date: 2019-07-26ZHEJIANG GEELY HLDG GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
ZHEJIANG GEELY HLDG GRP CO LTD
Publication Date
2019-07-26

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Abstract

The invention provides a motor control method and system based on a hall sensor, and relates to the field of motors. In the motor control method based on the hall sensor, after a motor is operated, firstly, whether at least one hall sensor in a hall sensor group in the motor breaks down or not is judged; and if at least one hall sensor breaks down, then whether the hall sensor group can work in afault mode or not is judged. If the hall sensor group can work in the fault mode, the angle of a rotor and a preset coordinate axis arranged on a stator is calculated according to a first calculationmethod; and finally, vector control is carried out on the motor according to the angle. By adopting the method, when the motor operates, the hall sensor is firstly subjected to fault diagnosis, so that it is ensured that the calculated angle position is accurate and credible. Meanwhile, when the hall sensor breaks down severely, the motor is forbidden to run, so that the safety of the vehicle is ensured.
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Description

technical field

[0001] The invention relates to the field of motors, in particular to a Hall sensor-based motor control method and system. Background technique

[0002] The back electromotive force waveform of the permanent magnet synchronous motor is partly different from the trapezoidal wave of the brushless DC motor, but a sine wave. If a square wave voltage is used to control the motor, the square wave control voltage and the sine wave back electromotive force will distort the current waveform of the motor, resulting in output torque fluctuations. Therefore, the control voltage of the permanent magnet synchronous motor needs to use vector control, which requires very accurate knowledge of the position of the rotor pole relative to the stator winding. Usually, the permanent magnet synchronous motor of new energy vehicles uses a resolver to obtain the accurate position of the rotor magnetic field of the motor, but the cost of the resolver is very high.

[0003] In the pr...

Claims

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