DC motor speed control system

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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Details

388814, 388903, 388930, 318139, H02P 517

Patent

active

053881761

ABSTRACT:
A speed controller for a DC motor minimizes speed droop and load droop through pulse width or frequency modulation. The controller provides an extra power increase upon engine starting or whenever a heavier load is temporarily encountered. The control circuit also has a current limiter, overload indicators, and a battery recharger. The controller is very inexpensive, primarily because all of the timing components are contained on a single integrated circuit timer chip such as a 556 timer. The controller contains other features, including a circuit for limiting the pulse width of the control signal from the pulse width modulator.

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Sears Owner Manual, 18-Inch Electric Lawnmower With Clip Handle, Dec. 19, 1990.
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