I was at a conference last week and we were discussing a vibration problem on a 2 speed motor / fan. The motor experiences a vibration spike when the speed is changed. The vibration is observed by shaft relative (proximity) probes. One of the questions posed, was is this "real" vibration or some type of measurement anomaly. There was a bit of discussion and brain storming. Someone suggests that the motor speed is changed by using different windings and that the windings might have different magnetic centers, thereby causing a jolt to the system when the speed is changed. It sounds interesting on the surface, but I'm pretty light on motor design, so I don't have any idea.
Note that this is not my motor / fan, so I don't have any other relevant facts.
What's your opinion?
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