What's the difference between a three-phase AC motor and a two-phase one?
The three-phase power is generally 380 pay, have four lines, of which three is the root of a FireWire, zero line; 380 volts of electricity is used as power industry; two-phase power is generally 220 volts, two lines, one of which is a FireWire, zero line is.220 volts of electricity is as electricity, or small machinery and electricity.
No motor, motor what you say is a single-phase motor, that is, the next two lines Oh, that is a live wire connected with a zero line, it is called a single-phase motor, three-phase motor is connected is three FireWire (FireWire is a phase, commonly known as FireWire only), rated single-phase motor the common voltage is 220V, is commonly used in industrial production, mainly for civilian use, because it is not efficiency of single-phase motor three-phase motor is high, so once the power requirements in kilowatts, or thousands of Watts will choose a three-phase motor, like motor home are generally single-phase motor, because the load is small, like in the industrial production of some motor to 5000KW, if single-phase motor, the other does not, the line is much more coarse!! In fact, there are two single-phase motor windings, a working group is winding, which is the main winding, a group is to start winding, is a secondary winding, due to single-phase motor single-phase power supply, so it will not produce a rotating magnetic field in the winding, but the pulsating magnetic field generated by the pulsating magnetic field will not generate torque, so the motor will do not rotate, so give him a start winding power supply starting winding is drawn from the power supply of the main winding, but the middle of the device can be shifted (such as capacitors) such a current through the device with different phase after the current phase, also became the so-called phase, resulting in the rotating magnetic field in the windings, the motor will rotate the rotation principle of three-phase motor, I will not say, all the same! The only reference is three-phase alternating current, without phase-shifting! To answer your question directly, the main difference is the different nature of the single-phase and three-phase power supply (I think so, hehe), the applicable scope of single-phase motor is mainly used for the power supply voltage of 220V, load is not the case!
A three-phase induction motor consists of a stator and a rotor. Its stator winding is a three-phase symmetrical winding with symmetrical power supply. A two-phase motor is used to specify a motor with a 2 phase winding. Two-phase motor is divided into two categories: drive and servo. The Dan Xiang asynchronous motor used in most household appliances and small appliances belongs to two phase drive motors. Two phase servo motor for control, the stator's two phase windings are exciting windings and control windings respectively, with a space difference of 90 degrees of electric angle.
