Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1976-12-23
1979-01-02
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318 17, 318330, H02P 510
Patent
active
041329333
ABSTRACT:
A chopper for adjustably controlling the average value of the voltage supplied from a D.C. battery source to a motor load for adjustable speed control. The chopper comprises manually-operable spring-biasing means for applying force to close a contact to energize the motor and electromagnetic means simultaneously energized for re-opening the contact. This occurs at a high repetition rate so that the average value of the voltage across the motor determines the motor speed. This average value of voltage is proportional to the closed-to-open time ratio of the contact and is adjustable by manual control. Two versions are disclosed. In the first version, the spring-biasing force is applied to the contact by depressing a trigger. In the second version, the spring-biasing force is applied to the contact by rotation of a knob. Both versions may use either tension or compression spring force.
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Barcz James P.
Bigelow James H.
Jaeschke James R.
Piber Earl T.
Spellman Gordon B.
Autio William A.
Cutler-Hammer, Inc.
Rather Hugh R.
Smith Jr. David
Taken Michael E.
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