Steady state analysis of an interior permanent-magnet synchronous motor driven by a PWM voltage source inverter

Interior Permanent-Magnet motors fed from inverters are becoming increasingly attractive in a wide variety of speed control applications of low and medium power range. In this paper, steady state analysis is computed by the state-variable method. Consequently, the following results were found: (1) Alternating-current components of d and q stator axes correspond to alternating components of d and q stator voltages which are changed by the PWM pattern. (2) Directions of d and q dumper currents are opposite those of d and q stator currents