Driving performance evaluation of Interior Permanent Magnet (IPM) motor using circuit parameter estimation

Abstract

This paper deals with the method of driving performance evaluation of interior permanent magnet (IPM) motors with 6-pole NdFeB magnets rotor and 9-slot stator. The circuit parameters of IPM motor such as Ld(d-axis inductance), Lq(q-axis inductance), torque and speed are investigated using 2-d finite element analysis(FEA) in each current value with phase angle condition. The low speed region below the based point presents speed-torque curve according to limited current in constant torque condition for maximum torque-per-ampere (MTPA) control. On the other hand, the high speed region above the based point draws speed-torque curve according to frequency and current angle variation in limited current and voltage for field-weakening control. This curve shows that suitable driving region to drive the IPM motors.