KSB Centrifugal Pump Lexicon –

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Single-phase asynchronous motor

The single-phase asynchronous motor is an electric motor that is operated using single-phase current.

The rotor winding is of is a squirrel-cage type and the stator winding comprises a main and an auxiliary winding whose magnetic axes are electrically offset by one half of a pole pitch (90°). The auxiliary winding is used to generate a rotary field component in the air gap of the machine so that the machine can self-start.

For this purpose, the motor is briefly connected to the power supply via a resistor or start capacitor at start-up. If a run capacitor is used, it also remains on during operation.

All single-phase asynchronous motors have a typical shunt characteristic (i.e. rotational speed gradually decreases as load increases) due to the constant air-gap flux.

  

  

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