stepper motor question

hi chaps (if anyone is still here)
When you turn a stepper motor with no current flowing it resists
turning. Anyone know what that property is called?
Also, is there such a thing as a stepper motor which doesn't resist
turning hen no current is flowing?
eg a stepper attached to a ballscrew moving an axis on a machine - put a
handle on it - can you get a proper feel to the motion, or do yuo have
to put up with the lumpiness?
Peter Fairbrother
Reply to
Peter Fairbrother
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Cogging or detent torque?
In the same way you can get moving iron motors that don't exhibit these characteristics, I see no reason why there shouldn't be a stepper motor with similar properties.
However, this really isn't my field.
Reply to
Mike Perkins
They do exist:
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seemingly with improved microstepping.
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Mike Perkins
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Peter Parry
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Gareth's Downstairs Computer

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