Research on the high overload permanent magnet synchronous motor considering extreme thermal load

The permanent magnet synchronous motor has the advantage of high power density and high power factor, which has been largely used in many occasions. When the permanent magnet motor is in high torque overload state, the stator winding current density is very high. So that the stator winding is in a severe fever, which impact motor's output power to enhance. This paper analyzed the influences of structure parameters and winding DC resistance on the extreme input current of permanent magnet motor in theory, and then researched the influences of the copper loss coefficient and the length of motor working time on motor overload ability, also the influence of the thermal load on the selection of electromagnetic parameters in high overload permanent magnet motor. Using the finite element this paper analyzed the electromagnetic parameters and the temperature of stator winding of high overload permanent magnet motor. Quantificationally calculate the overload ability of permanent magnet motor considering the extreme thermal load. Get a designing method of high overload permanent magnet motor. At last the correctness of theoretical calculation is verified by the experiment.