ABSTRACT
Temperature variation changes the stator resistance and flux remanence in the permanent magnets. The sensitivity of residual flux density in magnets for 100°C rise in temperature in ferrite, neodymium, and samarium cobalt magnets are 19%, -12%, and -3%, respectively, from their nominal values. The current control has no impact on the drive system due to temperature sensitivity of the magnets. The air gap power feedback control are necessary to overcome the parameter sensitivity of the rotor flux linkages variation and the same then could be used to compensate for other motor parameter variations. Temperature and saturation variations produce a nonlinear torque and mutual flux linkages amplifier of the permanent magnet synchronous machine drive with the consequence that the motor drive is not suitable for precision torque and speed control applications. The changes in the parameter variations could be detected and compensated similar to the methods described in vector-controlled induction motor drives.
