Torque control circuit for electrical motor

Electricity: motive power systems – Constant motor current – load and/or torque control

Reexamination Certificate

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Details

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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patent: 6696814 (2004-02-01), Henderson et al.
patent: 6836614 (2004-12-01), Gilmore
patent: 7112934 (2006-09-01), Gilmore
patent: 7791302 (2010-09-01), Krause et al.
patent: 2010/0001017 (2010-01-01), Herman et al.

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