stepper motor question

[Peter Fairbrother]

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?


ta


Peter Fairbrother

[Mike Perkins]

Post by Peter Fairbrother
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?

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.

[Mike Perkins]

Post by Mike Perkins

Post by Peter Fairbrother
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?

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.

They do exist:

https://www.linengineering.com/products/stepper-motors/z417-series/#fndtn-features

seemingly with improved microstepping.

[Peter Parry]

On Fri, 15 Jun 2018 13:35:51 +0100, Peter Fairbrother

Post by Peter Fairbrother
When you turn a stepper motor with no current flowing it resists
turning. Anyone know what that property is called?

Cogging?

[Gareth's Downstairs Computer]

Post by Peter Fairbrother
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?

Cogging