ABSTRACT
There are major torque production and energy conversion mechanisms that lead to the corresponding operation of electric machines as electromagnetic motion devices:
Induction Electromagnetics-The phase voltages are induced in the rotor windings as a result of the time-varying stator magnetic field and motion of the rotor with respect to the stator. The electromagnetic torque results because of the interaction of time-varying electromagnetic fields. Synchronous Electromagnetics-The torque results because of the interaction of time-varying magnetic field established by the stator windings and stationary magnetic field established by the windings or magnets on the rotor. Variable Reluctance Electromagnetics-The torque is produced to minimize the reluctance of the electromagnetic system (solenoids, relays, etc.), and the torque is created by the magnetic system in an attempt to align the minimum-reluctance path of the rotor with the time-varying rotating airgap mmf (synchronous electric machine).
