Permanent magnet synchronous motor temperature monitoring method and device and vehicle

A permanent magnet synchronous and electric motor technology, applied in the field of vehicles, can solve the problems of increasing system cost, increasing system failure points, reducing system reliability, etc., and achieves the effect of high calculation accuracy and simple method
CN114563100APending Publication Date: 2022-05-31GREAT WALL MOTOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GREAT WALL MOTOR CO LTD
Publication Date
2022-05-31

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Abstract

The invention provides a permanent magnet synchronous motor temperature monitoring method and device and a vehicle, and relates to the technical field of vehicles. The temperature of the permanent magnet synchronous motor can be simply and reliably monitored in real time in the running process of the electric vehicle. The method comprises the following steps: constructing a nonlinear observer by taking current and resistance as state variables; inputting real-time current of the permanent magnet synchronous motor into the nonlinear observer to obtain a change relation between the real-time current and theoretical current; calculating the real-time resistance value of the stator of the permanent magnet synchronous motor under the nonlinear observer according to the change relation; and determining the real-time temperature of the permanent magnet synchronous motor according to the real-time resistance value.
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Description

technical field

[0001] The present application relates to the technical field of vehicles, and in particular, to a method, device and vehicle for temperature monitoring of a permanent magnet synchronous motor. Background technique

[0002] Energy shortage and environmental pollution promote the development of electric vehicles. Permanent magnet synchronous motors have gradually become one of the core components of electric vehicles due to high power factor, high density, and high torque. However, due to the limited installation space of the permanent magnet synchronous motor in the electric vehicle, the poor heat dissipation conditions, and the large loss generated by the permanent magnet synchronous motor, the increase in the unit loss of the motor during operation will lead to a significant increase in the temperature of the motor.

[0003] The magnetic field strength of the permanent magnet decreases linearly with the increase of temperature, and increases linearly when t...

Claims

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