Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2011-05-03
2011-05-03
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S434000, C323S234000, C323S223000, C173S176000
Reexamination Certificate
active
07936140
ABSTRACT:
The torque control circuit of a hand tool contains a motor driving circuit, a current detection circuit, a reference voltage generation circuit, a current limiting circuit, and a torque configuration circuit. In the last stage of operation of the hand tool and when the average current has reached a predetermined level, the average current is maintained for a period of time to provide a constant average power and therefore to achieve an appropriate tightness of the bolt or nut being operated. The detection and control of current is achieved by a linear circuit which is robust to the heavy noises produced by the motor. A microprocessor is adopted to consider factors such as temperature in determining a suitable current level.
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Lei Leong C.
Leykin Rita
Mobiletron Electronics Co., Ltd.
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