Temperature distribution measuring method for high speed rotating permanent magnetism synchronous electric machine rotor

Abstract

A measuring method for a high speed rotating permanent magnetic synchronous rotor temperature distribution is used for measuring the surface temperature distribution of the permanent magnetic rotor of a high speed rotating permanent magnetic synchronous motor. The invention firstly drills a pore on the stator tooth and fixes the infrared temperature sensor in the pore to make the probe of the sensor oppose to the surface of the rotor; the invention also uses a variable-frequency governor to make the rotor in high speed rotation reduce below the critical measuring rotating speed in a short time and stabilize the operation; the data collecting system records the changes of the surface average temperature in the process of rotor deceleration measured by the sensor and the rotor surface temperature distribution of the stable operation below the critical measuring speed; the method adds two of the result to obtain the temperature distribution while rotating in high speed. The invention achieves the single sensor non-contact multi-point serial measurement for the rotor temperature distribution, avoiding the problems of installment of the sensor on the high speed rotor and the data transmission in the strong electromagnetic environment, solving the difficulties of hard measurement of the temperature distribution caused by the sensor responding time.

Description

technical field [0001] The invention relates to a method for measuring the rotor temperature of a high-speed rotating permanent magnet synchronous motor, which is used for measuring the surface temperature distribution of the permanent magnet rotor of the high-speed rotating permanent magnet synchronous motor. Background technique [0002] The permanent magnet rotor in a permanent magnet synchronous motor is very sensitive to temperature, and changes in temperature cause changes in its magnetism. Especially for the NdFeB permanent magnet rotor, when the motor runs for a long time under a certain load condition, the eddy current in the permanent magnet and iron core and the harmonics caused by the influence of the motor power supply and cogging will cause a large loss in the motor rotor. Most of these losses are converted into heat and dissipated, which causes a higher temperature rise in the motor rotor. At a higher temperature, the permanent magnet will demagnetize, and in ...

AI Technical Summary

Problems solved by technology

The optical fiber and the collector are important conversion components in the measurement process, which must be able to accurately transmit and collect the energy radiated by the rotor, otherwise it is difficult to ensure the accuracy of the measurement

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