Temperature identification method, system and device and computer readable storage medium

The invention discloses a temperature identification method, system and device and a computer readable storage medium, and relates to the field of motors, and the temperature identification method comprises the steps: obtaining the motor current and DC bus voltage of a permanent magnet synchronous motor; calculating a current power factor of the permanent magnet synchronous motor based on the motor current and the DC bus voltage; and determining the current rotor temperature of the permanent magnet synchronous motor through the current power factor. Complex flux linkage observation can be avoided, calculation is simple, a temperature sensor does not need to be installed on the motor rotor, and the operation safety, reliability and maintainability of the motor are improved. 本申请公开了一种温度辨识方法、系统、装置及计算机可读存储介质，涉及电机领域，该温度辨识方法包括：获取永磁同步电机的电机电流和直流母线电压；基于电机电流和直流母线电压计算永磁同步电机的当前功率因数；通过当前功率因数确定永磁同步电机的当前转子温度。本申请能够避免复杂的磁链观测，计算简单，也无需在电机转子上安装温度传感器，提高了电机的运行安全性、可靠性以及可维护性。