Three Phase Asynchronous Motors Classified By Motor Speed

① Constant speed motors come in various types, including regular cage type, special cage type (deep groove type, double cage type, high starting torque type), and wound type.
② A speed regulating motor is an electric motor equipped with a commutator. Generally, three-phase parallel excitation wound rotor motors (rotor control resistor, rotor control excitation) are used.
③ Variable speed motors include pole changing motors, single winding multi speed motors, special cage motors, and slip motors.