Speed control for a four pole motor

Details Speed control for a four pole motor Speed control for a four pole motor

1979-06-20

1981-04-28

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

310151, 310197, 318340, 318361, 318514, 318541, H02P 708

Patent

active

042648475

ABSTRACT:
A four pole d.c. motor speed control is provided by connecting two of the opposed brushes together to ground and the intermediate brushes to separate terminals of a switch means which in energized positions connects a grounded power supply to at least one of the brushes. The switch means supplies various combinations including direct connection of the power supply to one or both of the brushes. Connection of the power supply through resistance means, connection of the other brush to provide a closed circuit across the windings or to provide a resistance in series with those windings.

REFERENCES:
patent: 711667 (1902-10-01), Lundell
patent: 971199 (1910-09-01), Janisch
patent: 1003431 (1911-09-01), Churchward
patent: 1366984 (1921-02-01), Weichsel
patent: 2472646 (1949-06-01), Cochran
patent: 2625674 (1953-01-01), Petit

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