What is the difference between the three-phase ac motor and the second phase
No two phase motor, what do you mean by two phase motor is single-phase motor, is to connect two wires of that kind of, ha ha, is that after a fire a zero line, the so called single phase motor, three-phase motor is undoubtedly pick three root wire (wire is phase line, commonly known as wire), common single-phase motor rated voltage is 220 v, are not commonly used in industrial production, mainly used in civil, as there is no the three-phase motor is single-phase motor efficiency is high, so once the power requirements in kilowatts, or a few kilowatts can choose three-phase motor, like a home of the motor is single-phase motors, because the load is small, like some big motor in industrial production to 5000 kw, if the single-phase motor, if nothing else, the line is much more rough!
Three-phase electricity is usually 380. There are four lines, three of which are wire, and one is zero; 380 volts is used as an industrial power; The second phase is 220 volts, and there are two lines, one of which is a fire line, and one is a zero line.
The three-phase asynchronous motor is composed of stator and rotor, its stator winding is a three-phase symmetric winding and USES symmetrical power supply. The two phase motor specifies the motor for the two phase winding. Two phase motors are divided into two types: drive and servo. Most household appliances and small electrical appliances (single phase) asynchronous motors are two phase driven motors. The two-phase servo motor of control is controlled, the two phase winding of the stator is respectively the excitation winding and the control winding, which is 90 degree Angle in space.
Single-phase motor inside there are actually two sets of windings, a set of winding is work, also is the main winding, a set of start winding, namely vice winding, single-phase motor due to the single-phase power supply, so won't produce a rotating magnetic field in the winding, but the pulse magnetic field, pulse magnetic field does not produce torque, so the motor won't turn, so let's give him a start winding, the power of the startup winding is from the power supply of the main winding, but with the phase shifting device such as the capacitance that current phase by phase shifting device after the current is different, also became a so-called two-phase, so inside the windings creates a rotating magnetic field, motor will turn up, I would say the rotation of the three-phase motor principle, are all the same!
