Set_9._Stepper_Motors

Set_9._Stepper_Motors - Stepper Motors July 6, 2011 EEL...

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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 1 Stepper Motors July 6, 2011
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 2 Stepper Motors – Used when motion and position have to be precisely controlled. As their name implies, stepper motors rotate in discrete steps, with each step corresponding to a pulse that is supplied to one of its stator windings. Steps can advance from as much as 90 degree increments all the way down to a fraction of a degree per pulse. The rotor can be made to advance one step at a time or step at speeds up to 4000 rpm. They can rotate in either direction.
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 3 Stepper Motors The pulses are usually generated by a microprocessor. The pulses/pulse sequence can be counted and stored so that the exact number of steps and the exact position of the rotor are known at all times. These clearly have important industrial applications such as manufacturing, robotics, and many other areas.
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 4 N Pole 1 Pole 2 Pole 3 A B C 60 o Elementary Stepper Motor a I b I c I
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 5 N Pole 1 Pole 2 Pole 3 A B C 60 o Elementary Stepper Motor a I b I c I
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 6 N Pole 1 Pole 2 Pole 3 A B C 60 o Elementary Stepper Motor a I b I c I
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 7 Stepper Motors Rotor moves in 60 degree steps in a counterclockwise direction for switch sequence A,B,C,A,B,C,. ... We can reverse the rotation with the sequence A,C,B,A,C,B,. .. One switch is always on to keep the rotor in the present position so long as the load torque does not exceed the holding torque .
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EEL 3211 (© 2011, H. Zmuda) 9. Stepper Motors 8 Stepper Motors Note that as switch A opens and switch B closes the rotor will accelerate in a counterclockwise direction toward pole 2. It will
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Set_9._Stepper_Motors - Stepper Motors July 6, 2011 EEL...

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