Patent ID: 8169179

Claim:
A control system for energizing open-ended windings, the control system comprising a drive circuit having switching devices and at least six terminals operably connected to the switching devices, each of the terminals configured to be connected to an end of one of the open-ended windings, the drive circuit configured to operate the switching devices to transfer real AC power between a first set of voltages and through the terminals to the open-ended windings without the use of a substantial energy storage device while eliminating common mode voltage, and wherein the drive circuit comprises two converters, a first converter operably coupled to the first set of voltages and a first side of the open-ended windings, the first side having a first end of each of the open-ended windings, and a second converter operably coupled to the first set of voltages and a second side of the open-ended windings, the second side having a second end of each of the open-ended windings, wherein each converter is selectively operated to provide a set of voltages rotating either clockwise or counter-clockwise with respect to a reference frame of the machine having the open-ended windings.