Variable speed control switch for direct current electric power

Details Variable speed control switch for direct current electric power Variable speed control switch for direct current electric power

1998-05-12

1999-04-06

Masih, Karen

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388838, 388937, 318139, H02P 5165

Patent

active

058928855

ABSTRACT:
A motor control circuit for a power tool includes a function switch which has a first battery contact, a speed control contact, a bypass contact and, a second battery contact connected in that order in a line. The function switch also has a movable contact which sequentially connects the first battery contact to the bypass contact, the speed control contact to the second battery contact, and the bypass contact to the second battery contact. A solid state switch has conduction path connecting the speed control contact to the second motor terminal wherein the conduction path is controlled in response to an oscillator signal.

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