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Brushless motor position sensor magnetic steel breakage diagnosis method and diagnosis system

A technology of motor position and brushless motor, which is applied in the direction of control system, electronic commutator, motor control, etc., and can solve problems such as incorrect position information

Active Publication Date: 2021-03-02
SAIC MOTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the magnetic steel is broken and adsorbed on the surrounding metal shell, and does not rotate with the motor rotor, the rotor position measured by the RPS sensor remains unchanged, and the position information provided by the RPS is incorrect. The common diagnosis for the RPS chip under this working condition cannot good fault recognition

Method used

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  • Brushless motor position sensor magnetic steel breakage diagnosis method and diagnosis system
  • Brushless motor position sensor magnetic steel breakage diagnosis method and diagnosis system
  • Brushless motor position sensor magnetic steel breakage diagnosis method and diagnosis system

Examples

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no. 1 example ；

[0102] Such as image 3 As shown, the present invention provides a brushless motor position sensor magnet broken diagnosis method, comprising the following steps:

[0103] 101. Input the angle of the motor position sensor, and calculate the maximum value of the angle change of the motor position sensor;

[0104] 102. Determine whether the maximum value of the angle change of the motor position sensor is greater than the design angle change threshold, and calculate the maximum value of the motor output torque change according to the judgment result; if it is less than or equal to the design angle change threshold, synchronously calculate the angle change corresponding to the motor position sensor The maximum value of the motor output torque variation within the time;

[0105] If it is greater than the design angle variation threshold, the variation of the motor output torque is cleared, and the maximum value of the motor output torque variation within the maximum range of the ...

no. 2 example ；

[0110] Such as Figure 4 As shown, the present invention provides a brushless motor position sensor magnet broken diagnosis method, comprising the following steps:

[0111] 201. Input the angle of the motor position sensor, and calculate the maximum value of the angle change of the motor position sensor or the maximum value of the speed of the motor position sensor;

[0112] 202. Determine whether the maximum value of the angle change of the motor position sensor is greater than the design angle change threshold, or whether the maximum speed of the motor position sensor is greater than the design speed threshold, and calculate the maximum value of X change according to the judgment result, X=(a*m+b *n), a is the hand force, b is the motor output assist, m and n are the calibration coefficients;

[0113] If the maximum value of the angle change of the motor position sensor is less than or equal to the design angle change threshold, or the maximum value of the motor position se...

no. 3 example ；

[0119] Such as Figure 5 As shown, the present invention provides a method for diagnosing the broken magnetic steel of a brushless motor position sensor, comprising the following steps:

[0120] 301, input hand force, motor output assist and motor position sensor angle;

[0121] 302. Calculate the maximum value of the angle change of the motor position sensor, or the maximum value of the rotation speed of the motor position sensor, and the change amount of X within the time corresponding to the angle change of the motor position sensor, X=(a*m+b*n), a is the hand force, b is the output power of the motor, m and n are the calibration coefficients;

[0122] 303. Calculate the X change amount according to the maximum value of the angle change amount of the motor position sensor or the maximum value of the motor position sensor speed; if the maximum value of the angle change amount of the motor position sensor is greater than the design angle change amount threshold, or the maxim...

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Abstract

The invention discloses a brushless motor position sensor magnetic steel breakage diagnosis method which comprises the following steps: inputting the angle of a motor position sensor, and calculatingthe maximum value of the angle variation of the motor position sensor; judging whether the maximum value of the angle variation of the motor position sensor is greater than a designed angle variationthreshold value or not, and calculating the maximum value of the motor output torque variation according to a judgment result; and diagnosing whether magnetic steel breakage occurs or not according tothe calculated maximum value of the output torque variation of the motor and a designed counting threshold value. The invention discloses a brushless motor position sensor magnetic steel breakage diagnosis system. According to the invention, the fault of the motor position sensor caused by the breakage of the mechanical structure and magnetic steel of the motor position sensor can be quickly andaccurately diagnosed, and the safety of the system is improved.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to a method for diagnosing broken magnetic steel of a brushless motor position sensor used in an automotive electronic power steering system. The invention also relates to a magnetic steel broken diagnosis system for a brushless motor position sensor used in an automobile electronic power steering system. Background technique [0002] When the brushless motor outputs power to the outside, it needs to know the position information of the motor rotor, and the RPS (motor position sensor) can detect the position of the motor rotor. It is worth pointing out that if the motor rotor position information provided by the RPS is incorrect, the motor output assist does not match the target torque, resulting in abnormal motor assist. There are many negative effects brought about by the abnormal power assist of the motor. For example, in the electric power steering system, the RPS provides...

Claims

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Application Information

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IPC IPC(8): H02P6/16H02P29/024B62D5/04
CPCH02P6/16H02P29/024B62D5/049
Inventor 尚冉李兵曹晨军罗毅张小乐
Owner SAIC MOTOR