Multi-speed motor system combining at least a one speed electric motor, series resistor and power switches
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United States of America Patent
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Nov 18, 2008
Grant Date -
Apr 20, 2006
app pub date -
Apr 14, 2005
filing date -
Oct 19, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-speed permanent magnet D.C. electric motor system 10 includes at least one permanent magnet DC electric motor 11 configured to operate at at least one speed. A current limiting device R1 is constructed and arranged to lower electrical input power to the motor 11 so that a speed of the motor is reduced, when the motor is powered together with the current limiting device, as compared to a speed of the motor powered absent the current limiting device. Switching structure K1, K2, K3 is associated with the current limiting device to selectively operate the motor at at least three discrete speeds, even though the motor is configured for at least one-speed operation.
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