Universal-motor speed control


Posted on Nov 24, 2012

Simple half-wave motor speed control is effective for use with small universal (ac/dc) motors. Maximum current capability 2 amps RMS. Because speed-dependent feedback is provided, the control gives excellent torque characteristics to the motor, even at low rotational speeds


Universal-motor speed control
Click here to download the full size of the above Circuit.

Normal operation at maximum speed can be achieved by closing switch Si, thus bypassing the SCR.




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