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Sensorless Control For PMDC Motors 
Feb 1, 2005
A technique for controlling motor speed without Hall sensors or other signal-generating devices saves wear on bearings and brushes, decreases motor noise, and reduces no-load current....

Testing Open- and Closed-Loop Current Sensors 
Aug 1, 2003
Simple construction allows an open-loop Hall effect sensor to beat its closed-loop counterparts in terms of price, weight, and size; yet it may be susceptible to temperature variation and saturation....

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