Three-phase electric rammer or two-phase power
But the three-phase motor's magnetic field is round, can start from itself, the single-phase motor's magnetic field is the pulsating magnetic field, needs to increase the capacitance or the resistance, and starts the coil, causes it to form the ellipse magnetic field, can start.
Another difference is that the power used is different. Usually the home and no three-phase power supply using single-phase motor, power is usually relatively small, industrial and high-power places are selected three-phase motor.
Still use three-phase electricity, turn the distance is big, power is sufficient.Three phase motor and single-phase motor principle is basically the same, are electromagnetic principles of application.
