Abstract: Methods and apparatus provide for: a first DC bus operating to support a first DC voltage potential and for connecting to a DC input of a motor driver inverter circuit; a motor emulator circuit operating to emulate a polyphase motor and including polyphase output terminals for connecting to a polyphase output of the motor driver inverter circuit; a second DC bus operating to support a second DC voltage potential to a DC input of the motor emulator circuit; and a bi-directional DC-DC power supply coupled between the first and second DC busses, and operating to both: (i) add voltage potential to the first DC voltage potential to produce the higher, second DC voltage potential on the second DC bus, and (ii) subtract voltage potential from the second DC voltage potential to produce the lower, first DC voltage potential on the first DC bus.

Abstract: Methods and apparatus provide for: a first DC bus operating to support a first DC voltage potential and for connecting to a DC input of a motor driver inverter circuit; a motor emulator circuit operating to emulate a polyphase motor and including polyphase output terminals for connecting to a polyphase output of the motor driver inverter circuit; a second DC bus operating to support a second DC voltage potential to a DC input of the motor emulator circuit; and a bi-directional DC-DC power supply coupled between the first and second DC busses, and operating to both: (i) add voltage potential to the first DC voltage potential to produce the higher, second DC voltage potential on the second DC bus, and (ii) subtract voltage potential from the second DC voltage potential to produce the lower, first DC voltage potential on the first DC bus.

Abstract: Methods and apparatus for achieving a system, including: a polyphase machine having a plurality of sets of polyphase windings, each of the respective windings of a first of the sets of polyphase windings being inductively linked to one of each of the respective windings of the remaining sets of polyphase windings; a polyphase inverter operable to receive power from the windings of the first set and to produce a polyphase output; and a plurality of single-phase inverters, each operable to receive power from the windings of a respective one of the remaining sets and to produce a single-phase output, wherein each of the respective phases of the polyphase output may be coupled in series or parallel with one of the respective single-phase outputs to produce an aggregate polyphase output.