Permanent magnet direct current motor

Details Permanent magnet direct current motor Permanent magnet direct current motor

1995-05-05

1997-02-18

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 51, 361115, H02H 504

Patent

active

056046545

ABSTRACT:
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.

REFERENCES:
patent: 3983432 (1976-09-01), Rankin
patent: 4138630 (1979-02-01), Graham
patent: 4625136 (1986-11-01), Kipke
patent: 5113104 (1992-05-01), Blaettner et al.

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