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  • What is the difference between a DC motor and servo motor? - The Handy Board

    From the page: If you switch the power on and off fast enough, then it just seems like the motor is running weaker--there's no stuttering. This is what PWM means when referring to DC motors. The Handy Board's DC motor power drive circuits simply switch on and off, and the motor... more

    Reviewed by Inertial-Mass Jun 30, 04:22pm ( 2 reviews ) • handyboard.com

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  • Rated by aloishis89 on Aug 05, 8:45pm

    PWM and PPM can be confusing, this explains it fairly well.

  • Rated by Inertial-Mass on Jun 30, 4:22pm

    From the page: If you switch the power on and off fast enough, then it just seems like the motor is running weaker--there's no stuttering. This is what PWM means when referring to DC motors. The Handy Board's DC motor power drive circuits simply switch on and off, and the motor runs more slowly because it's only receiving power for 25%, 50%, or some other fractional percentage of the time. A servo motor is an entirely different story. The servo motor is actually an assembly of four things: a normal DC motor, a gear reduction unit, a position-sensing device (usually a potentiometer--a volume control knob), and a control circuit. The function of the servo is to receive a control signal that represents a desired output position of the servo shaft, and apply power to its DC motor until its shaft turns to that position. It uses the position-sensing device to determine the rotational position of the shaft, so it knows which way the motor must turn to move the shaft to the commanded position. The shaft typically does not rotate freely round and round like a DC motor, but rather can only turn 200 degrees or so back and forth. The servo has a 3 wire connection: power, ground, and control. The power source must be constantly applied; the servo has its own drive electronics that draw current from the power lead to drive the motor. The control signal is pulse width modulated (PWM), but here the duration of the positive-going pulse determines the position of the servo shaft.