Donald M Lamaster

US Patent:

44672616, Aug 21, 1984

Filed:

Jul 12, 1982

Appl. No.:

6/397031

Inventors:

Donald M. Lamaster - Costa Mesa CA

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

H02P 536

US Classification:

318810

Abstract:

A motor drive system which utilizes the relatively poor storage time or turn-off time of Darlington pair power transistors which have typically been used as the driver elements in inverter motor driver applications. It primarily finds use in multiphase systems, such as the six step three phase inverter. The relatively long turn-off time of the power Darlington provides relatively constant collector current to the motor without the need for additional circuitry to provide constant base drive load. An additional circuit automatically and dynamically tailors the motor torque to the load requirements to minimize unnecessary use of electrial energy.