CROSS COUPLED MOTOR GATE DRIVE

WIPO Patent Application WO2000046912

A3

A motor system including a gate drive for driving a motor. An inverter bridge circuit selectively connects power supply link rails to a winding of the motor for energizing the winding with a motoring current. The bridge circuit has upper and lower power switches connected between the winding and the upper and lower power supply link rails, respectively. Each lower switch corresponds to one of the upper switches on the same side of the winding as the lower switch to define an arm of the bridge circuit. A control circuit generates a motor controlled signal to control the switches. A drive circuit drives the upper switches in response to the state of the corresponding lower switches, which are responsive to the motor control signal. The drive circuit includes a voltage gain element connected to each arm of the bridge circuit that is responsive to current in the respective lower switch for maintaining the corresponding upper switch in its nonconducting state. In a three phase embodiment, a quadrature axis winding corresponds to each phase winding. Each of the quadrature axis windings is in magnetic coupling relation with the rotatable assembly and positioned for generating an output signal representative of angular position of the rotatable assembly. The control circuit generates the motor control signal to control commutation of the phase windings in response to the output signals of the quadrature axis windings.

YOUNG GLEN C
KIEFER JAMES R

PCT/US2000/003040

December 14, 2000

February 04, 2000

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GEN ELECTRIC (US)

H02P6/08; H02P6/16; H02P25/04; H02P25/08; H02P27/06; H03K17/08; (IPC1-7): H02P7/00; H02P6/08

EP0881760A2	1998-12-02
US5153487A	1992-10-06
EP0896422A1	1999-02-10

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