TACHOMETERLESS_MOTOR_SPEED_CONTROL

Published:2009/7/9 22:44:00 Author:May | From:SeekIC

This provides bidirectional speed regulation for small motors and requires no tachometer. The volt-age that summing amplifier IC1A applies to the motor's windings equals:whereVCis the command voltage and IM is the motor current.If you set the motor's winding resistance and brush resistance(RM)equal to:the command voltage will be proportional to the motor winding's counter emf. C1 provides compen-sation. Set R1's value so that it equals 5 to 10% of RM's value. You can generally find RM's value in a motor's spec sheet.



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