Patent ID: 6291963
Filing Date: 2001-09-18
Classification: B60L,H02P,Y02T

Abstract:
A drive circuit for a motor/generator, the motor/generator having a stator and a rotor, the stator having a plurality of coils, each coil having a first terminal, the rotor rotating due to a rotating magnetic field formed by the coils when a polyphase alternating current is supplied to the first terminals of the coils, the drive circuit comprising:a source of direct current;an inverter converting the direct current to a polyphase alternating current based on control signals each of which corresponds to each phase of the current and supplying the polyphase alternating current to the first terminals of the coils;a difference detection circuit which detects a difference in electrical potentials at two different neutral points in an electrical circuit constituted by the motor/generator and the drive circuit; anda plurality of signal generating circuits each of which generates the control signal corresponding to each phase of the current in response to the difference in the electrical potentials.