A dual function motor/generator includes a rechargeable battery, a mode switching device, a dual function rotor/stator structure, at least two transmission devices and a clutch device for selecting one of the two transmission devices depending on whether a motor or generator mode is selected. When the...http://www.google.com/patents/US6828691?utm_source=gb-gplus-sharePatent US6828691 - Single body motor/generator dual function device
