Single phase motor wiring with 2 capacity-reverse and forward
A 220V motor has the same structure as a three-phase motor, but 1 or 2 capacitors are added to simulate the third phase.
In the case of an assembly with 2 capacitors (1 permanent + 1 starting), the starting torque is better (1.8 to 2.5 the nominal torque). The starting capacitor is operated for 2-3 seconds, then is automatically decoupled for a microswitch in the motor, to make room for the permanent capacitor.
When manufactured, the windings of single-phase 220V motors are calculated differently from three-phase motors, in order to keep count of capacitors. A three-phase 2.2 kw motor and a single-phase 2.2 kw motor will therefore have the same power, the same nominal torque, but different consumptions (in Amps), twice as high for a single-phase motor.
If you modify a three-phase motor by adding capacitors, you will lose 30% to 50% of the initial motor power.
Two reasons for adding capacitors to single-phase motor.
1- In the original structure , the main coil and the auxiliary coil are powered at the same time and the same electromagnetic force is generated to cancel each other ,and the rotor can not rotate.
2- to make the magnetic field force rotate , it can be achieved by passing alternating current current of different phase sequences in the main coil and the auxiliary coil .
the existence of the coil capacitor fulfills this function.
when the motor accelerates to a certain value, the centrifugal switch is disconnected, and the motor runs at the rated speed.
Single phase motor wiring with 2 capacity-reverse and forward
A 220V motor has the same structure as a three-phase motor, but 1 or 2 capacitors are added to simulate the third phase.
In the case of an assembly with 2 capacitors (1 permanent + 1 starting), the starting torque is better (1.8 to 2.5 the nominal torque). The starting capacitor is operated for 2-3 seconds, then is automatically decoupled for a microswitch in the motor, to make room for the permanent capacitor.
When manufactured, the windings of single-phase 220V motors are calculated differently from three-phase motors, in order to keep count of capacitors. A three-phase 2.2 kw motor and a single-phase 2.2 kw motor will therefore have the same power, the same nominal torque, but different consumptions (in Amps), twice as high for a single-phase motor.
If you modify a three-phase motor by adding capacitors, you will lose 30% to 50% of the initial motor power.
Two reasons for adding capacitors to single-phase motor.
1- In the original structure , the main coil and the auxiliary coil are powered at the same time and the same electromagnetic force is generated to cancel each other ,and the rotor can not rotate.
2- to make the magnetic field force rotate , it can be achieved by passing alternating current current of different phase sequences in the main coil and the auxiliary coil .
the existence of the coil capacitor fulfills this function.
when the motor accelerates to a certain value, the centrifugal switch is disconnected, and the motor runs at the rated speed.
No comments:
Post a Comment