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Can Schneider Electric BRS type stepping motors be used in a zero pressure atmosphere such as in a vacuum chamber?

No, BRS 3 phase stepping motors are not designed to be used in a vacuum atmosphere.
The strike and creep distances within the motor are too small.
In addition the bearing grease is not suitable for atmospheres without air pressure.
Parts of the grease would volatilize under these conditions.

BRS 3 phase motors are designed for altitudes up to 2000m but from altitudes of 1000m and higher the motor ratings will be lower.

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