Magnet Temperature Detection of PMSM with Wireless Power Transfer

Temperature information of the magnet on permanent magnet synchronous motors (PMSMs) is crucial to prevent failures caused by the thermal demagnetization of magnets. This paper proposes a detection method for the magnet temperature of PMSMs using a wireless power transfer (WPT) system with a thermistor. The magnet temperature is measured by the NTC thermistor, which is connected to the secondary side of a WPT system. The temperature change of the magnet is detected through the change in the input power on the primary side. The prototype of the WPT system is designed and demonstrated based on the characteristics of the thermistor.