Circuit to momentarily increase the peak torque of a DC motor

Details Circuit to momentarily increase the peak torque of a DC motor Circuit to momentarily increase the peak torque of a DC motor

2006-08-22

2009-02-03

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S432000, C323S220000, C323S242000, C323S246000

Reexamination Certificate

active

07486040

ABSTRACT:
A motor control circuit for supplying power to a DC motor which drives a mechanism having a driven shaft, the control circuit having a parallel combination of a capacitor and switch in series with the DC motor. When the movement of the driven shaft is obstructed, the motor driver and the switch are synchronized in a manner to first charge the capacitor and then to reverse the voltage generated by the motor driver to momentarily double the voltage applied to the DC motor so that the increased torque of the DC motor is able to overcome the obstruction. The mechanism having a shaft driven by the DC motor may be, for example, an ETC valve or a window regulator.

REFERENCES:
patent: 3761792 (1973-09-01), Whitney et al.
patent: 3926264 (1975-12-01), Bardwell et al.
patent: 5844343 (1998-12-01), Horst
patent: 6166500 (2000-12-01), Makaran
patent: 6239610 (2001-05-01), Knecht et al.
patent: 6566839 (2003-05-01), DaSilva et al.
patent: 6867561 (2005-03-01), Pollock et al.

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