System and method for permanent magnet DC motor reversing

Details System and method for permanent magnet DC motor reversing System and method for permanent magnet DC motor reversing

1993-02-22

1994-11-29

Ro, Bentsu

Electricity: motive power systems

Motor-reversing

318293, H02P 122

Patent

active

053693434

ABSTRACT:
System and method for selecting a rotational direction of a permanent magnet DC motor, the system including multiple relays and a control switch electrically interconnected so as to provide an open circuit to the motor when the motor is off. In one embodiment, the system includes first and second relays each including switch contacts and a coil for switching voltage to the motor. The system also includes a third relay including switch contacts and a coil for switching voltage to the motor, a control switch having multiple switch positions for selecting the rotational direction of the motor. The control switch, the motor and the relays are electrically interconnected such that a first control switch position provides a first voltage to the motor, a second control switch position provides a second voltage to the motor, the second voltage being opposite in polarity to the first voltage, and a third control switch position provides the open circuit to the motor.

REFERENCES:
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patent: 1732711 (1929-10-01), Boddie
patent: 2098069 (1937-11-01), Stewart
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patent: 3229181 (1963-08-01), Evans
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patent: 4987353 (1991-01-01), Imaeda
patent: 5023493 (1991-06-01), Wresinski
patent: 5132600 (1992-07-01), Kinoshita

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