DC MOTOR SPEED CONTROL


Posted on Feb 5, 2014

Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers` push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages` saturation drops) across the motor in either direction. The circuit uses a mechanically-coupled tachometer to provide speed-stabili


DC MOTOR SPEED CONTROL
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zing feedback to the first amplifier section. The motor`s speed and direction of rotation is set by adjusting the 10 k ohm potentiometer at the amplifier`s noninverting input. The RFCF feedback network prevents oscillation by compensating for the inherent dynamic mechanical lag of the motor. Select the RFCF time constant to match the particular motor`s characteristics.




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