Method and apparatus for determining and adjusting torque in an

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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7386221, H02P 517

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active

059637072

ABSTRACT:
A method and apparatus for adjusting torque in an electric impact torque wrench. A current sensing circuit passes current through a power relay for powering an electric impact torque wrench. The power relay is normally in a conducting state. The current sensing circuit includes a threshold current indicator which is activated when current flowing through the current sensing circuit reaches a predetermined threshold amount. The threshold current indicator is provided to a first timer which counts an activation-off time since the threshold indicator is activated, the first timer presuming that the current has remained above the predetermined threshold amount during this time. At the conclusion of the activation-off time, the first timer signals a time-off extender circuit. On receipt of the signal, the time-off extender circuit (1) switches the power relay to a non-conducting state, to interrupt the flow of current therethrough, (2) counts a predetermined time-off time, at the conclusion of which the time-off extender circuit switches the power relay back to the conducting state, and (3) resets the first timer for repeat of the aforedescribed cycle.

REFERENCES:
patent: 4168454 (1979-09-01), Gmeinder
patent: 4177412 (1979-12-01), Minakuchi
patent: 5440215 (1995-08-01), Gilmore
patent: 5526460 (1996-06-01), DeFrancesco et al.
patent: 5731673 (1998-03-01), Gilmore

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