Pole reversing motors
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Three-phase AC synchronous motors with cage rotors in which the number of poles and, for this reason, the synchronous speed of the rotary field can be changed by changeover of the stator winding. This enables coarse adjustment of the low-loss speed setting.
The most used motor with two adjustable speeds has either a switchable or two separate stator windings. The switchover of one pole number to the other is carried out by means of a special polarity switch or with the aid of contactors.
