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Patent Searching and Data


Title:
METHOD AND APPARATUS FOR DC MOTOR SPEED CONTROL
Document Type and Number:
WIPO Patent Application WO1990008996
Kind Code:
A3
Abstract:
In a preferred embodiment, a high-frequency, pulse-width-modulated, power-transistor, DC motor speed controller having current limiting in both drive and regenerative modes, essentially constant ramping rates regardless of whether or not the operator switches to neutral before changing direction, a simple sequencer which controls the timing of four functions-both drive and regenerative current measuring circuits and both drive and regenerative transistors, a highly effective transistor filter capacitor arrangement, and circuitry in which the level of regenerative current is used as an input to control the current under which the direction relays switch.

Inventors:
POST STEPHEN F (US)
MELE DAVID (US)
Application Number:
PCT/US1990/000220
Publication Date:
October 17, 1991
Filing Date:
January 17, 1990
Export Citation:
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Assignee:
CURTIS INSTR (US)
International Classes:
H02P3/14; B60L7/12; B60L11/18; B60L15/28; H02P7/28; H02P7/29; (IPC1-7): G05F/
Foreign References:
US4024457A1977-05-17
US4290000A1981-09-15
US4611154A1986-09-09
Other References:
See also references of EP 0459998A4
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