Subject:
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RE: 2-phase servos
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 31 Jul 1996 17:25:18 GMT
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Original-From:
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Chuck McManis <CMCMANIS@nospamFREEGATE.NET>
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Viewed:
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1616 times
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Two comments for Garth (and others doing this)
#1) You have 2 phase, bipolar *STEPPER* motors, not "servo" motors. The
difference is quite significant if you were expecting a servo motor.
A stepper motor has a coils positioned around the motor shaft and can
move and shaft in steps (typically about 1.8 degrees but that spec varies
by type.) These coils can also hold the motor in place.
(And the digi-key diagram is correct for how you would step this motor)
A servo motor is a standard DC motor with a tachometer attached to the
motor shaft. Depending on the model the tachometer may return simple
pulses, a varying positive voltage, a bipolar voltage, or quadrature encoding.
These require a loop controller to control accurately.
#2) On your hall effect sensor you should try both sides of the magnet. Some are only
sensitive to one pole, others latch first one way and then the other when different poles
of the magnet pass by.
--Chuck
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