The so-called low-voltage refers to the AC voltage below 1000V, and here we say that the motor voltage is generally AC 380V, or 440V or 660V and other grades of asynchronous motor。
Three phase induction motor for motor operation. The rotor speed of the three-phase asynchronous motor is lower than that of the rotating magnetic field. The rotor winding generates electromotive force and current due to the relative movement between the magnetic field and the magnetic field, and electromagnetic torque is generated with the interaction of the magnetic field to realize the energy conversion.
Compared with the single phase asynchronous motor, the three-phase asynchronous motor has good performance and saves various materials. According to the different rotor structure, three-phase asynchronous motor can be divided into two types of cage and winding. The squirrel cage rotor asynchronous motor is widely used because of its simple structure, reliable operation, light weight and low price. Its main disadvantage is the speed regulation difficulty. The rotor and stator of the wound three-phase asynchronous motor are also equipped with three phase winding and connected with the external rheostat through the slip ring, brush and external rheostat. Adjusting rheostat resistance can improve the starting performance of motor and adjust the speed of motor