Electric motor, electric motor winding temperature detection method and device as well as electric motor winding thermal protection method and device

Abstract

The invention discloses an electric motor, an electric motor winding temperature detection method and device as well as an electric motor winding thermal protection method and device. The electric motor winding temperature detection method comprises the following steps: acquiring the electric motor winding temperature at the previous moment; then calculating temperature rise of a rotor equivalentbody after operating for one time step; and finally calculating the electric motor winding temperature at the next moment by superimposing the electric motor winding temperature at the previous moment with the temperature rise of the rotor equivalent body after operating for one time step. According to the electric motor winding temperature detection method, the electric motor winding temperatureis monitored in real time; the performance of the electric motor is exerted; and the sensitivity of the electric motor is improved.

Description

technical field [0001] The invention relates to a motor, in particular to a detection method and a detection device of the motor winding temperature, a motor thermal protection method and a motor thermal protection device. Background technique [0002] When the motor is working, part of the electrical energy is converted into mechanical energy output, and part of it is converted into heat energy, which slowly spreads into the air or other media through the structural material of the motor. If the heat energy cannot be transmitted to the medium other than the motor in time, the temperature of the motor windings will rise to a certain extent, and the motor may be burned. [0003] The general motor winding temperature detection or detection method is the "overcurrent protection method". This method detects the operating current of the motor, and when the operating current reaches a specified value, it performs a prescribed action to protect the motor. Since the motor running c...

AI Technical Summary

Problems solved by technology

This method has the advantage of accurate temperature detection, but it needs to add auxiliary devices, which is costly; in addition, for some small motors, it is often complicated to install thermal components

In addition, the temperature detected by the thermal element must be sufficiently close to the dangerous heat source to detect the actual temperature of the dangerous heat source, and for the motor, it is very difficult to realize

Images