Method and device for monitoring temperature rise of motor windings

Abstract

The invention discloses a method and a device for monitoring the temperature rise of motor windings. The method of the present invention includes the following steps: establishing the dynamic thermal energy equation of the motor; collecting and calculating the state parameter value of the motor related to the dynamic thermal energy equation at the current moment; based on the dynamic thermal energy equation according to the state parameter The value calculation obtains the winding temperature rise of the motor at the current moment. Compared with the prior art, the method and device according to the present invention can monitor the temperature rise of motor windings more accurately and effectively; at the same time, the method and device according to the present invention do not need to change the internal structure of the motor, which is simple to implement, low in cost, and relatively Low promotion difficulty.

Description

technical field [0001] The invention relates to the electromechanical field, in particular to a method and device for monitoring the temperature rise of motor windings. Background technique [0002] Permanent magnet motors have outstanding advantages such as simple structure, reliable operation, small size, light weight, high power density, and high efficiency. With the continuous improvement of high-performance rare earth permanent magnet materials, permanent magnet motors have attracted much attention in recent years and have begun to be used in the field of traction. Due to the limitation of installation space and weight, traction motors usually adopt high electromagnetic load. The loss generated by the traction motor is relatively high during operation, which leads to serious heating of the motor, which directly affects the life of the insulation material and the operation reliability of the motor. [0003] Since permanent magnet motors are excited by permanent magnets...

AI Technical Summary

Problems solved by technology

[0005] The temperature sensor can reflect the temperature of the location in real time, but the embedding and fixing of the temperature sensor needs to be carried out during the motor production process, which increases the complexity of the motor production process and the production cost of the motor; in addition, the temperature sensor can only monitor the temperature change of the local position of the motor , and if too many temperature sensors are embedded, it will increase the complexity of motor control; at the same time, the embedding of temperature sensors may affect the insulation performance of motor windings and the magnetic field distribution in the motor, which will adversely affect the working state of the motor

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