PERMANENT MAGNET DIRECT CURRENT MOTOR

WIPO Patent Application WO1994029935

A3

Disclosed is an improvement to the stability of D.C. motor brushes mounted in brush boxes with wings is improved by angling the wings toward the commutator such that the brush spring contacts the brush at one or more points intermediate the ends of the brush. Improved cooling is provided by utilizing an end plate with apertures and a brush plate which in combination with the commutator, provides a brush plate aperture for cooling air flow. In a preferred embodiment, speed variations of the motor can be achieved by selectively disconnecting one or more brushes in a four brush embodiment reducing the torque and rotating speed of the motor. In a preferred embodiment, the use of a diode to interconnect same polarity brushes permits a speed change to be accomplished by selectively connecting one or the other end of the diode. In a further preferred embodiment, the stalling of the motor having power applied is indicated by an electronic output where voltage applied to one brush is filtered through an RC filter with the output amplified and voltage doubled. A ripple output indicating that the motor is rotating after amplification will light a light emitting diode indicating proper operation of the motor.

WILLE GUILLERMO
PEDIGO DONALD BRUCE
BLAETTNER HARALD EDMUND
WIELAND BERND ALBERT
CUNNINGHAM ELDON R

PCT/US1994/005595

March 02, 1995

May 19, 1994

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GEN ELECTRIC (US)
BG AUTOMOTIVE MOTORS INC (US)

H01R39/38; H01R39/40; H02K9/28; H02K11/00; H02K11/02; H02K23/66; (IPC1-7): H01R39/40; H01R39/38; H02K9/28; H02K11/00; H02K23/66

DE3010036A1	1981-10-01
US3983432A	1976-09-28
EP0148474A2	1985-07-17

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