Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1994-09-30
1996-10-08
Sircus, Brian
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318476, 7386223, 173176, H02P 300
Patent
active
055634826
ABSTRACT:
A drill/driver (eg. an electric drill) with a screwdriver attachment, and a method of controlling the drill/driver, are described. A control circuit (30) controls the speed of rotation of the motor (38, 39) through a time delay circuit (42) and a triac (41). The control circuit (30) uses the time delay information and information inputted from a rotational speed sensor (43) to monitor the current in the motor or a parameter related at least in part to current in the motor. When a change corresponding to an increase in the rate of change of current in the motor is detected, the control circuit (30) stops the motor to provide an automatic torque control feature for a screwdriving operation.
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Ferragina Rosario
Shaw David M.
Black & Decker Inc.
Dearing Dennis A.
Del Ponti John D.
Sircus Brian
Yocum Charles E.
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