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An AC machine control system for an AC machine (motor, generator, transformer, etc.) having open-ended windings, the control system comprising a drive circuit configured to transfer AC power between a first set of voltages and each end of the open-ended windings without the use of a substantial ener

An AC machine control system for an AC machine (motor, generator, transformer, etc.) having open-ended windings, the control system comprising a drive circuit configured to transfer AC power between a first set of voltages and each end of the open-ended windings without the use of a substantial energy storage device, while eliminating common mode voltage and/or injecting zero sequence voltages.

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1. 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 dri

1. 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. 2. The control system of claim 1 wherein each of the converters comprise matrix converters. 3. The control system of claim 1 wherein the drive circuit further comprises a third converter coupled to the first set of voltages and configured to transfer power to each of the first and second converters through a pulsating DC link of voltages. 4. The control system of claim 1 and wherein each of the converters is operated to either repeatedly apply voltages rotating clockwise for a first selected time period and voltages rotating counter-clockwise for a second selected time period, where a ratio of the first selected time period to the second selected time period adjusts a power factor seen by an energy source providing the first set of voltages. 5. 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, 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 injects zero-sequence voltage at each respective side of the open-ended windings such that the sum of the zero-sequence voltage injected to the first side and the zero-sequence voltage inected to the second side is substantially zero. 6. The control system of claim 5 wherein the drive circuit further comprises a third converter coupled to the first set of voltages and configured to transfer power to each of the first and second converters through a pulsating DC link of voltages. 7. The control system of claim 5 wherein each of the converters comprise matrix converters. 8. The control system of claim 5 and wherein the drive circuit adjusts an input power factor to the open-ended windings. 9. A control system for energizing open-ended windings, the control system comprising a drive circuit configured to transfer AC power between a first set of voltages and each end of the open-ended windings without the use of a substantial energy storage device wherein the drive circuit comprises three converters each converter having switching devices, wherein a first converter is coupled to the first set of voltages and configured to operate the switching devices thereof to provide a pulsating DC link of voltages, a second converter is coupled to the DC link of voltages and a first end of the open-ended windings, and a third converter is coupled to the DC link of voltages and a second end of the open-ended windings. 10. The control system of claim 9 wherein the second and third converters each comprise inverters. 11. The control system of claim 9 wherein the first converter comprises an inverter. 12. The control system of claim 11 wherein the inverter comprises a three-level inverter. 13. The control system of claim 11 wherein the inverter comprises a two-level inverter. 14. The control system of claim 9 wherein the first converter comprises a DC matrix converter. 15. The control system of claim 9 and further comprising means for adjusting an input power factor to the open-ended windings. 16. The control system of claim 9 and further comprising a high frequency transformer switching assembly including at least one high frequency transformer operably coupled in the DC link. 17. The control system of claim 9 wherein the second and third converters are configured to provide multi-phase AC voltages rotating clockwise and counter-clockwise. 18. The control system of claim 17 wherein the second and third converters are configured to provide multi-phase AC voltages rotating clockwise for a selected duration and counter-clockwise for another selected duration. 19. The control system of claim 9 and further comprising an active filter coupled to the DC link of voltages. 20. A method for energizing open-ended windings of an AC machine, the method comprising: providing a drive circuit having a plurality of switching devices and at least six terminals operably connected to the switching devices, wherein the drive circuit comprises a first converter and a second converter;connecting each of the terminals to an end of one of the open-ended windings, wherein the first converter is coupled to a first end of the open-ended windings and the second converter is coupled to a second end of the open-ended windings;while eliminating common mode voltage and/or injecting zero sequence voltages, connecting the AC machine to a source of multi-phase AC power with the drive circuit;directly converting real power to or from the AC machine with two sets of multi-phase AC voltages with the and second converters and without the use of a substantial energy storage device;using the first converter to provide a first set of the multi-phase AC voltages to first ends of the open-ended windings, using the second converter to provide a second set of the multi-phase AC voltages to second ends 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. 21. The method of claim 20 and further comprising adjusting the input power factor of the source of multi-phase AC power. 22. A method for energizing open-ended windings of an AC machine, the method comprising: providing a drive circuit having a plurality of switching devices and at least six terminals operably connected to the switching devices, wherein the drive circuit comprises a first converter and a second converter;connecting each of the terminals to an end of one of the open-ended windings wherein the first converter is coupled to a first end of the open-ended windings and the second converter is coupled to a second end of the open-ended windings;connecting the AC machine to a source of multi-phase AC power with the drive circuit;directly converting real power to or from the AC machine with two sets of multi-phase AC voltages with the first and second converters and using a pulsating DC link of voltages and without the use of a substantial energy storage device;using the first converter to provide a first set of the multi-phase AC voltages to first ends of the open-ended windings; andusing the second converter to provide a second set of the multi-phase AC voltages to second ends of the open-ended windings. 23. The method of claim 22 and further comprising adjusting the input power factor of the source of multi-phase AC power.