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Motors with polarity ratio equal to 2 (2/4 poles, 4/8 poles) made with a single winding and switchover of the number of poles by modifying the internal connections. The standard execution has a Dahlander YY/ D connection and single voltage supply (usually 400V./50Hz ).
Motors with polarity ratio other than 2 (e.g. 4/6 poles, 2/8 poles). In this case motors have two distinct windings and the possibility of being supplied with one voltage at Y or D connection. Standard motors are supplied with Y connection and are fed at 400V/50Hz.