Permanent magnet motor rotor temperature detection device

Abstract

The invention discloses a permanent magnet motor rotor temperature detection device, which includes a temperature detection unit fixedly installed in a lightening hole of a permanent magnet motor rotor core and used for detecting the temperature of the rotor core in real time; and a display unit wirelessly connected to the temperature detection unit and used for displaying the temperature detectedby the temperature detection unit in real time. The permanent magnet motor rotor temperature detection device has the advantages of simple structure, accurate and fast detection, and the like.

Description

technical field [0001] The invention mainly relates to the technical field of motor temperature measurement, in particular to a permanent magnet motor rotor temperature detection device. Background technique [0002] The permanent magnet synchronous motor does not need electric excitation of the rotor magnetic field. The excitation method is permanent magnet excitation. Due to the particularity of the permanent magnet, the motor needs to prevent foreign matter such as dust, water, acid and alkali from entering the motor and damaging the permanent magnet, especially to prevent rail vehicles from During operation, the metal powder produced by the friction between the wheel and the rail enters the interior of the motor and is adsorbed on the surface of the permanent magnet motor rotor, resulting in a smaller air gap between the stator and rotor of the motor, or even sweeping the bore. Therefore, the permanent magnet synchronous traction motor usually adopts a fully enclosed stru...

AI Technical Summary

Problems solved by technology

Since the permanent magnet synchronous traction motor usually adopts a fully enclosed cooling structure, the heat dissipation condition of the permanent magnet rotor is very poor, and the rotor will also be affected by the radiation heat of the stator core, resulting in a high temperature of the permanent magnet, and because the permanent magnet will lose magnetism at high temperature, And once the permanent magnets have irreversible demagnetization or demagnetization, the performance of the permanent magnet motor will be reduced or even completely lost, which will seriously affect the reliability of the motor operation. Therefore, it is necessary to detect the temperature of the permanent magnet of the motor rotor

[0003] Since permanent magnet synchronous traction motors usually adopt a fully enclosed structure, infrared thermometers cannot be used to measure the temperature of the rotor core of the motor; the temperature sensors used for general temperature measurement include NTC, PT100, thermocouples, etc., all of which are wired temperature sensors and are not suitable for rotors. The temperature measurement of the rotating body; in addition, the air gap of the permanent magnet motor is small, which is not enough to install the wireless temperature sensor

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