Modify a three - phase motor to be powered by 220V

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There are usually two methods to modify a three - phase motor to be powered by 220V, and the specific introduction is as follows:

### Capacitor Phase - Splitting Method
- **Principle**: Utilize the phase - shifting characteristic of the capacitor to create a phase difference between the current passing through the capacitor and the current of another phase. Thus, a rotating magnetic field required by the three - phase motor is simulated, enabling the motor to operate under a single - phase 220V power supply.
- **Steps**
- **Determine the motor connection method**: First, judge the winding connection method of the three - phase motor. The common ones are star (Y) connection and delta (△) connection. If it is star - connected, it can be changed to delta - connected, which can match the motor phase voltage with the power supply voltage and achieve better performance.
- **Select the capacitor**: Select an appropriate capacitor according to the power of the motor. Generally, for every 100W of motor power, a capacitor of 4 - 6μF can be selected. For example, for a 1kW motor, a capacitor of 40 - 60μF can be used.
- **Connect the circuit**: Connect the capacitor in series with one of the motor windings. Then connect this winding and one end of the other two windings together and connect it to the live wire of the 220V power supply. Connect the other ends of the other two windings together and connect it to the neutral wire of the 220V power supply.

### Inverter Method
- **Principle**: The inverter can convert the input 220V single - phase alternating current into three - phase alternating current with adjustable frequency and voltage, providing a suitable power supply for the three - phase motor. Thus, the motor can be speed - regulated and operate under a 220V power supply.
- **Steps**
- **Select the inverter**: Select a suitable inverter according to the parameters of the three - phase motor, such as power, voltage, and current. The rated power of the inverter should be greater than or equal to that of the motor. For example, for a 3kW three - phase motor, an inverter of 3.7kW or 4kW can be selected.
- **Connect the circuit**: Connect the 220V power supply to the single - phase input terminal of the inverter, and connect the three - phase output terminals of the inverter to the three - phase windings of the three - phase motor correspondingly.
- **Set parameters**: Through the operation panel of the inverter, set the rated parameters of the motor, such as rated voltage, rated current, and rated frequency; set the operating parameters, such as operating frequency, acceleration time, and deceleration time.

When modifying a three - phase motor to be powered by 220V, pay attention to safety. Cut off the power supply first and ensure that the operation complies with electrical safety regulations. If you are not familiar with the operation, it is recommended to consult professional electrical technicians or electricians.

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