Patent ID: 6329783
Filing Date: 2001-12-11
Classification: H02P

Abstract:
Apparatus for obtaining a variable speed motor operation comprising:a. a rotor surrounded by a stator and connectable to a load;b. the stator having main windings controlled by switching mechanisms connected thereto for control of current through the main windings;c. the switching mechanisms for control of current through the main windings being configured to run the main windings in a series or in a parallel configuration;d. the firing rates of the switching mechanisms for control of current through the main windings being variably set by a controller to determine the speed of the motor and the series or parallel configuration operation of the main windings;e. the controller connected to a speed demand unit for input of motor speed commands to the controller;f. whereby, the controller varies the firing rate of the switching mechanisms for control of current therethrough in both series and parallel operation of the main windings according to the motor speed command from the speed demand unit to yield a variable speed motor.