Apparatus for varying the speed of DC motors

Details Apparatus for varying the speed of DC motors Apparatus for varying the speed of DC motors

1983-10-21

1984-10-23

Truhe, J. V.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318346, 318361, 318439, 318541, H02P 728

Patent

active

044790791

ABSTRACT:
The commutator of a DC motor is uniquely constructed to include at least one dead segment at least as wide as the associated brush (brushes). A silicon controlled rectifier (SCR) is arrranged in the circuit between the voltage source and said brush (brushes) to provide a switching means to automatically cut off current flow therethrough each time a brush passes over the dead segment. The current is reestablished by way of a gating means, which in the preferred embodiment is a variable frequency pulse generator.

REFERENCES:
patent: 2006172 (1935-06-01), Klappauf
patent: 2905876 (1959-09-01), Hillman
patent: 2986687 (1961-05-01), Mohan
patent: 4247808 (1981-01-01), Hanner

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