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air gap angle angular approximately armature current axis chopper circuit of Fig coil current commutator machine commutator motor component conductor connected constant core loss current density Determine direct direct current direct-voltage drive effect energy equivalent circuit example ferromagnetic field current field intensity Figure flux density harmonic hysteresis ignored induced voltage induction machine induction motor inverter leakage flux leakage inductance linear load current load voltage loop magnetic circuit magnetic field magnetic material magnetizing current magnetizing inductance magnetomotive forces magnitude open-circuit operating output parameters path permanent magnet permanent-magnet phase currents phasor poles power factor produce r/min rad/s ratio reactance relation reluctance rotating rotor frequency shown in Fig sinusoidal sinusoidally distributed slots space vector speed speed-torque stator current stator flux linkage stator resistance stator voltage stator winding steady-state switch synchronous machine synchronous motor terminal voltage three-phase thyristors toroidal torque transient two-pole variable-speed drive variables waveform zero