Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1992-03-27
1993-08-17
Wysocki, Jonathan
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318265, H02P 300
Patent
active
052372480
ABSTRACT:
A control circuit for use in an electrically powered tool, such as a screw driver, includes a double-pole double-throw (DPDT) relay switch having two wiper contacts movable between ON and OFF positions. A motor is connected to a power supply through the DPDT relay switch. To stop the rotations of the motor, the two wiper contacts trip from ON positions to OFF positions in ganged fashion. With the use of DPDT relay switch, even if one of the two wiper contacts undergoes chattering actions at its OFF position, the remaining wiper contact allows a large braking current to flow in a closed loop, whereby contacts of the DPDT relay switch are prevented from being melted caused by the braking current.
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Hirata Genji
Honma Shigeru
Ishizuka Takahito
Mizoguchi Toshio
Hitachi Koki Co,. Ltd.
Wysocki Jonathan
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