Double Speed Three Phase Motors (DP Series)
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Three-phase motors type DP are dual speed three phase motors. They are used in those applications in which two fixed speeds are requested. They are obtained by swapping over the motor poles and are of two types:
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.
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