The connection method we use for the motor is related to the working current, and when the cross sectional area of the motor's internal winding is fixed, the triangle connection method is used for high voltage, and the star connection method is used for low voltage.

Generally, high-power motors use the delta connection method because they can reduce the load current. Single phase motors are usually used in daily families, but three-phase motors are rarely used. When the triangle connection method is used, the voltage applied to the motor coil is line voltage. When star connection method is used, the voltage applied to motor coil is phase voltage. The relationship between line voltage and phase voltage is √ 3Uphase u003dU line.

Because the internal resistance of the motor is determined after the completion of the motor, the higher the voltage, the smaller the current according to the same power situation. In addition, I would like to add that the combustion of the motor is not caused by the high voltage, but by the excessive current, because the current flows through the conductor to generate heat, rather than the conductor heating when the voltage is applied. The method to find out the wiring error of permanent magnet synchronous motor is to use a multimeter to connect the Y-shape of the three-phase winding of the permanent magnet synchronous motor. Any phase is connected to the 36V power supply, and the other two phases are connected to the multimeter. Observe for readings.

If there is a reading, it indicates that the phase without power has been reversed. MA ＃ Instrument ＃ Method Connect the three phases of the permanent magnet synchronous motor to the mA instrument, and then slowly rotate the hand rotor. If the pointer does not move or move, the three-phase connection is correct. If the hand swings greatly, it means that the wiring is wrong. You can replace the wiring of one phase winding and try again.

The steering method connects the permanent magnet synchronous motor winding Y to the neutral point and the reason. Connect the 380V power supply to the two lead lugs of the motor in turn. Pay attention to the rotation direction of the motor. If the motor turns the same three times, the head and tail are correct. If the tertiary permanent magnet synchronous motor has the same steering direction twice, it means that the winding of the phase has participated in the same direction.