Auxiliary phase single phase electric motors can be of two types, starterless and capacitor starting motors and they are found with 2, 4 and 6 poles for the frequencies of 50 to 60 Hz.
The starter with capacitor has the same operation as the starter without a capacitor. The difference is that it is connected in series with the auxiliary capacitor winding and that the capacitor is usually used in motors with a higher load.
During start-up of the starterless motors the auxiliary winding is connected in parallel with the main winding and at the moment the motor reaches a certain speed, about 80% of normal speed, a circuit-breaker switches off the auxiliary winding. The motor only works with the main winding.
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The speed of single-phase motors will depend on the number of poles and the frequency of the mains. This type of motor, auxiliary phase, which have capacitor, has more vigorous torque.
When the single-phase motor is stopped, the springs push the spool over the contacts, and this closes the starter winding circuit.