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Determination of stator temperature for thermal protection in a Permanent Magnet Synchronous Machine

This paper presents an on-line method for determining the hottest spot temperature of the copper windings of a Permanent Magnet Synchronous Machine (PMSM). The purpose is to protect the Electrical Machine (EM) from high temperatures which reduces the lifetime of the machine and can eventually lead to insulation faults of the motor. The method relies on experimental data acquired from a network of thermocouples placed around the stator windings of an actual PMSM. A mathematical model is proposed and the parameters are derived from the measurement data. Finally, the temperature of the hottest spot is determined on-line based on a single, fixed, temperature sensor placed in an accessible area of the stator (It is assumed that this is not the hottest temperature spot) and on the operating point of the PMSM. The data is combined in a Particle Filter (PF). The described method can be used with minor changes to any type of EM. The algorithm is executed in an offline environment with experimental data from a real motor-load test bench.