Method and apparatus for monitoring temperature rise of motor winding

Abstract

The invention discloses a method and apparatus for monitoring a temperature rise of a motor winding. The method comprises the following steps: establishing a dynamic thermal energy equation of a motor; acquiring, calculating and obtaining state parameter values of the motor, related to the dynamic thermal energy equation at a current time point; and based on the dynamic thermal energy equation, according to the state parameter values, obtaining the temperature rise of the winding of the motor at the current time point through calculation. Compared to the prior art, the temperature rise of the motor winding can be more accurately and efficiently monitored according to the method and apparatus provided by the invention; and at the same time, according to the method and apparatus provided by the invention, the internal structure of the motor does not have to be changed, the realization is simple, the cost is low, and popularization difficulty is quite low.

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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