H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/93
H02P 6/00 (2006.01) H02P 6/06 (2006.01)
Patent
CA 1169919
A CONTROL SYSTEM FOR A DC MOTOR ABSTRACT OF THE DISCLOSURE A control system for a DC motor controlling the supply of power to polyphase coils by a drive transistor has a DC-DC switching converter for changing an output voltage according to an on-time ratio of the switching semiconductor, and a voltage controller for detecting a voltage drop across the drive transis- tor and for controlling the on-time ratio of the switching semi- conductor so that the voltage drop across the drive transistor may be a predetermined small value. Therefore, the control system for a DC motor has a high power efficiency but reduced noise in the polyphase coils because of the operation of the DC-DC switching converter and the voltage controller. Furthermore, the control system for a DC motor can precisely control the supply of power to the polyphase coils by the drive transistor. -0-0-
346134
Fetherstonhaugh & Co.
Matsushita Electric Industrial Co. Ltd.
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