Ac motor

To realize the mechanical energy and electrical energy transformation of mini electric motor mechanical communication. Ac motor is the most commonly used motor. Due to the status of the motor can pass, the same motor as a generator and motor. Ac motor according to the varieties could be divided into two types: synchronous motor and induction motor. Synchronous motor rotor rotational speed n s the same as the rotating magnetic field rotation speed, is called the synchronous speed. N s and pick up the frequency of the alternating current polarity logarithmic relationship between p and f motor for n s = f/p. In China, the power frequency 50 hz, so two pole motor synchronous speed is 3000 RPM, quadrupole motor synchronous speed is 1500 RPM, and so on. The speed of the rotor asynchronous motor is wholesalemotor.blogspot.com always less than or more than the speed of the rotating magnetic field, the difference between the two (called slip) usually within 10%. 

The speed of the ac motor (either synchronous or asynchronous) the restriction of the power frequency, and speed control is difficult. Ac motor generally adopts three-phase system, because of the three-phase ac motor compared with the single phase motor, no matter in such aspects as performance index, raw material use and price has obvious advantages. Large capacity synchronous motor are turning pole type, namely the rotor magnetic pole, is produced by passing a dc excitation winding, and synchronous machine very logarithm is the logarithmic rotor magnetic pole. Eight pole motor rotor is eight pole, 2 p = 8, namely the motor with 4 poles. Steam turbine generator is non-salient pole Dongfeng Electric type motor, more commonly a logarithmic rarely, generally for 1, 2, and n = 60 f/p, so his speed is high, up to 3000 RPM (frequency), and the number of considerable ac electric motor hydro-generator, for salient pole rotor structure, the process is more complex, because the number of his lot, so he has a very low speed, maybe only a few turns per second.