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Old November 29th, 2017, 03:46 AM   #2
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United Kingdom

Rob... is offline
Join Date: Jul 2016
Location: Manchester
Posts: 148
Single rotation motor, from what I can see on that drawing is just a normal 3 phase squirrel cage motor. You can change the direction by swapping 2 phases.

Pole changing motors, from what it looks like and what I've worked on before, dependent on how you wire the motor at it's terminals dictated how many poles the winding have. So effectively its a duel speed motor.

R1 and R2 will be wired to some form of thermistor embedded in the motor winding's. Wire to a thermistor protection relay, this will trigger when the motor winding gets hot. If wired into the control circuit properly, it should stop the motor before irreversible winding damage has happened.
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