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GS-D200 Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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GS-D200 Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 17 page 6/17 BIPOLAR STEPPER MOTOR BASICS Simplified to the bare essentials, a bipolar perma- nent magnet motor consists of a rotating-perma- nent magnet surrounded by stator poles carrying the windings (fig. 5). Figure 5: Simplified Bipolar Two Phase Motor Bidirectional drive current is imposed on windings A-B and C-D and the motor is stepped by commu- tating the voltage applied to the windings in se- quence. For a motor of this type there are three possible drive sequences. Figure 6: One-Phase-on (Wave Mode) Drive One-Phase-on or Wave Drive Only one winding is energized at any given time according to the sequence : AB - CD - BA - DC (BA means that the current is flowing from B to A). Fig. 6 shows the sequence for a clockwise rotation and the corresponding rotor position. Two-Phase-on or Normal Drive This mode gives the highest torque since two wind- ings are energized at any given time according to the sequence (for clockwise rotation). AB & CD ; CD & BA ; BA & DC ; DC & AB Fig. 7 shows the sequence and the corresponding position of the rotor. Half Step Drive This sequence halves the effective step angle of the motor but gives a less regular torque being one winding or two windings alternatively energized. Eight steps are required for a complete revolution of the rotor. The sequence is: AB ; AB & CD ; CD ; CD & BA ; BA ; BA & DC ; DC ; DC & AB as shown in fig. 8. By the configurations of fig. 6, 7, 8 the motor would have a step angle of 90 ° (or 45 ° in half step). Real motors have multiple poles pairs to reduce the step angle to a few degrees but the number of windings (two) and the drive sequence are unchanged. GS-D200/GS-D200S |
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