Single-phase motor wiring - Extra Know

Single-phase motor wiring

Single-phase motor wiring

Single-phase electric motor with capacitor
A 220V motor has the same structure as a three-phase motor, but 1 or 2 capacitors are added to simulate the third phased.

In the case of mounting with 2 capacitors (1 permanent + 1 start), the starting torque is better (1.8 to 2.5 the nominal torque). The starter capacitor runs for 2-3 seconds, then is decoupled automatically for a microswitch in the motor, to leave room for the permanent capacitor.
When manufactured, the windings of 220V single-phase motors are calculated differently from three-phase motors, in order to maintain the capacitors counter. A 2.2 kw three-phase motor and a 2.2 kw single-phase motor will have the same power, the same nominal torque, but consumptions (in Amps) different, 2 times higher for a single-phase motor.
If you change a three-phase motor by adding capacitors, you will lose 30% to 50% of the initial power of the motor.
TECHNIC-ACHAT offers 220V single-phase electric motors up to 3.7KW (5hp) in 3000 rpm and 1500 rpm

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