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Method and device for detecting state of permanent magnet in permanent magnet synchronous motor and vehicle

A permanent magnet synchronous motor and detection method technology, applied to the detection device of the permanent magnet state in the permanent magnet synchronous motor for vehicles, the detection of the permanent magnet state in the permanent magnet synchronous motor for vehicles, the field of vehicles, and can solve the problem of large demagnetization of permanent magnets Risk and other issues, to achieve the effect of simple and effective detection

Pending Publication Date: 2021-02-02
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the rotor temperature exceeds the temperature limit (such as 150 ℃), the permanent magnet will have a great risk of demagnetization

Method used

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  • Method and device for detecting state of permanent magnet in permanent magnet synchronous motor and vehicle
  • Method and device for detecting state of permanent magnet in permanent magnet synchronous motor and vehicle
  • Method and device for detecting state of permanent magnet in permanent magnet synchronous motor and vehicle

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Embodiment Construction

[0031] In order to realize the monitoring and protection of permanent magnets, the method adopted in the related art is: when the permanent magnet synchronous motor is controlled, the temperature sensor of the stator winding is detected by the temperature sensor embedded in the permanent magnet synchronous motor stator winding, so as to prevent the permanent magnet synchronous motor from Operating temperature is too high.

[0032] However, the inventors found that embedding a temperature sensor in the stator winding of a permanent magnet synchronous motor cannot effectively monitor the temperature of the rotor of the motor in time and effectively monitor the state of the permanent magnet. When the permanent magnet is demagnetized, it cannot be detected, and the information on whether the permanent magnet is demagnetized cannot be obtained. Once the permanent magnet synchronous motor demagnetizes, it will gradually deteriorate, accelerate the demagnetization, and accelerate the...

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Abstract

The invention discloses a method and a device for detecting the state of a permanent magnet in a permanent magnet synchronous motor for a vehicle and the vehicle. The method for detecting the state ofthe permanent magnet in the permanent magnet synchronous motor for the vehicle comprises the steps that the current running state of the vehicle is obtained; if the vehicle is in the neutral gear sliding state at present, the rotating speed and the quadrature-axis voltage of the permanent magnet synchronous motor are obtained; a permanent magnet flux linkage value is calculated according to the rotating speed and the quadrature-axis voltage of the permanent magnet synchronous motor; and whether the permanent magnet is in an abnormal state is judged according to the permanent magnet flux linkage value. According to the method for detecting the state of the magnet, the state of the permanent magnet is judged through the rotating speed and the quadrature-axis voltage of the permanent magnetsynchronous motor, other equipment does not need to be added, and the method is simple and effective and facilitates timely processing when the permanent magnet is in an abnormal state.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for detecting the state of a permanent magnet in a permanent magnet synchronous motor for a vehicle, a device for detecting the state of a permanent magnet in a permanent magnet synchronous motor for a vehicle, and a vehicle. Background technique [0002] At present, the traction system of rail transit mainly adopts motor traction, and new energy vehicles such as hybrid vehicles and pure electric vehicles are also driven by motors. Due to the advantages of high power density and operating efficiency, permanent magnet synchronous motors have been widely used in rail traction systems and new energy vehicle drive systems. The permanent magnet is a key component that provides the main magnetic field in the permanent magnet synchronous motor, and its health status will determine whether the permanent magnet synchronous motor can output torque normally. When the rotor temperat...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R33/12
CPCG01R31/343G01R33/12
Inventor 徐鲁辉杜智勇
Owner BYD CO LTD
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