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STEPPER MOTOR DRIVING

APPLICATION NOTEAN235/0788 STEPPER MOTOR DRIVINGBy H. SAXFrom a circuit designer s point of view STEPPER mo-tors can be divided into two basic types : unipolarand STEPPER MOTOR moves one step when the directionof current flow in the field coil(s) changes, reversingthe magnetic field of the stator poles. The differencebetween unipolar and bipolar motors lies in the maythat this reversal is achieved (figure 1) :Figure 1a : BIPOLAR - with One Field Coil andTwo Chargeover Switches That areSwitched in the Opposite Direction. Figure 1b : UNIPOLAR - with Two Separate FieldCoils and are Chargeover Switch. Figure 2 : ICs for Unipolar and Bipolar )b)BIPOLARD edicated integrated circuits have dramatically simplified STEPPER MOTOR DRIVING . To apply these ICs desi-gners need little specific knowledge of MOTOR DRIVING techniques, but an under-standing of the basics will helpin finding the best solution.

the motor does not deliver any more energy in this range ; the efficiency factor is extremely bad. ... a no a lower supply volt-age is connected to the winding thru a diode. This kind of circuit by no means reaches the perfor-mance of the clocked stabilized power contro asl per

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