Transcription of WORKING WITH STEPPER MOTORS - robotoid.com
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WORKING WITH STEPPER MOTORS - robotoid.com
In past chapters we ve looked at powering robots using everyday continuous DC MOTORS are cheap, deliver a lot of torque for their size, and are easily adaptable to avariety of robot designs. By their nature, however, the common DC motor is rather impre-cise. Without a servo feedback mechanism or tachometer, there s no telling how fast a DCmotor is turning. Furthermore, it s difficult to command the motor to turn a specific num-ber of revolutions, let alone a fraction of a revolution. Yet this is exactly the kind of preci-sion robotics work, particularly arm designs, often the STEPPER motor .
280 WORKING WITH STEPPER MOTORS. STEP ANGLE Stepper motors vary in the amount of rotation of the shaft each time a winding is energized. The amount or rotation is called the step angle and can vary from as small as 0.9° (1.8° is more common) to 90°. The step angle determines the number of steps per revolution.
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