Why asynchronous motor AC excitation, rather than DC excitation?
An induction motor is a kind of AC motor based on the air gap rotating magnetic field and the induction current in the rotor winding to generate electromagnetic torque, so as to realize the energy conversion. As the rotor winding current is induced, so there is a certain difference between its speed and synchronous speed. Asynchronous motor and synchronous motor difference: synchronous motor running normally, the revolution is fixed, not because of changes in load changes. In normal operation, the revolution of the induction motor is not fixed, but it varies slightly with the change of the load. Synchronous motors are complex circuits with reversible energy (motors and generators are interchangeable theoretically) and are used as generators
Synchronous motor is also a kind of AC motor. Mainly used for generators, motors can also be used, generally used for larger power, speed does not require the adjustment of production machinery, such as large water pumps, air compressors and mine fans. In recent years, due to the development of permanent magnet materials and electronic technology, micro synchronous motor has been more and more widely used. One of the characteristics of synchronous motors is the steady running speed, N and stator current frequency f1 has a strict constant relationship, that is, n=60f1/p=n0 synchronous motor speed n and rotating magnetic field speed N0 the same. The name of "synchronization" comes from here. The stator of a synchronous motor goes without saying that the general rotor coil must be energized to keep it in sync with the stator. (the rotor of the micro synchronous motor can be made of permanent magnetic steel.)Asynchronous motor is different, the stator winding energized to generate rotating magnetic field, in the rotor to generate induction current, so that the motor rotation. Structure than synchronous motor simple
Synchronous motor is also a kind of AC motor. Mainly used for generators, motors can also be used, generally used for larger power, speed does not require the adjustment of production machinery, such as large water pumps, air compressors and mine fans. In recent years, due to the development of permanent magnet materials and electronic technology, micro synchronous motor has been more and more widely used.One of the characteristics of synchronous motors is that the speed of n is stable, and there is a constant relationship between the stator speed and the frequency f1 of the stator currentN=60f1/p=n0The speed n of synchronous motor is the same as that of rotating magnetic field n0. The name of "synchronization" comes from here.
