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Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle

A permanent magnet synchronous motor and electric vehicle technology, which is applied in motor generator testing, magnetic performance measurement, etc., can solve problems such as complexity, many instruments, and cannot be detected on the spot, and achieves a small amount of calculation, high reliability, and a simple and feasible solution. Effect

Active Publication Date: 2022-05-13
SHANDONG JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the analysis of the coil back EMF signal is used to realize the demagnetization detection, but this method can only be detected when the motor is powered off, and cannot be detected on the spot when the motor is running
Consider the influence of temperature on the permanent magnet synchronous motor, and measure the state of the permanent magnet through the active short-circuit current. This method requires more instruments for measurement, and the measurement method is more complicated
At present, the hidden danger of permanent magnet synchronous motor demagnetization has not been solved. Most of the research is only at the stage of simulating the ideal model with SIMULINK in the laboratory, and the existing methods are relatively complicated, which cannot be quickly detected online in real time, which affects the motor. operational reliability

Method used

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  • Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle
  • Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle
  • Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle

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Embodiment 1

[0070] A method for quickly detecting demagnetization of an electric vehicle permanent magnet synchronous motor, specifically comprising the following steps:

[0071] S101:

[0072] The remote service management platform obtains the real-time operation data of each electric vehicle. The present invention mainly focuses on the parameters closely related to the field weakening degree of the permanent magnet synchronous motor, including the accumulated mileage of the vehicle, the state of the driving motor, the speed of the driving motor, the torque of the driving motor, the driving Motor temperature, motor controller input voltage and motor controller DC bus current, and store the above data in the database.

[0073] S102:

[0074] Determine the effective working conditions of permanent magnet synchronous motor demagnetization rapid detection: the state of the driving motor is power consumption, select the temperature range of the motor, which is between 20°C and 50°C, and sele...

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Abstract

The invention discloses a method and a system for quickly detecting demagnetization of a permanent magnet synchronous motor of an electric automobile, which relate to the technical field of automobile detection and comprise a data acquisition step, an effective working condition determination step, a current change determination step, an efficiency determination step, a critical threshold determination step and a demagnetization aging judgment step. According to the method, the demagnetization aging degree of the motor is analyzed, the calculated amount is small, online real-time detection can be achieved, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of vehicle detection, in particular to a method and system for quickly detecting demagnetization of a permanent magnet synchronous motor of an electric vehicle. Background technique [0002] Permanent magnet synchronous motors are widely used in new energy vehicles because of their simple structure, reliable operation, small size, light weight, low loss, high efficiency, strong overload capacity, high energy density and wide speed range. However, when the permanent magnet synchronous motor suffers from high temperature, armature reaction (including overcurrent) and mechanical vibration caused by stator turn-to-turn or phase-to-phase short circuit, the permanent magnet will undergo irreversible demagnetization, which will affect the performance of the permanent magnet and cause the motor torque Performance degradation, and even serious consequences such as motor scrapping, especially for electric vehicles, di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R33/12
CPCG01R31/34G01R33/12Y02T10/72Y02T10/64G01R31/343B60L3/0061H02P29/662H02P25/03B60L2240/425B60L3/12B60L2240/423B60L2250/10
Inventor 黄万友李世娜褚瑞霞仇方圆杨君赵家瑞朱佩东谭世威常昊刘志华文垣晨韩富兆李想
Owner SHANDONG JIAOTONG UNIV
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