cnbohai51

Motor It includes a rotor spinning with coils passing magnets at the same frequency as the AC and produces a magnetic field to drive it. One type of synchronous motor is like an induction motor except that the rotor is excited by a DC field. The rotor poles connect to each other and move at the same speed. Another type, for low load torque, has flats ground onto a conventional squirrel-cage rotor to create discrete poles. The largest are used for ship propulsion, pipeline compression and pumped-storage applications with output exceeding 100 megawatts. With only a few moving parts, AC motors have the potential to last for years. The durability of AC motors makes them a preferred solution for field applications such as agricultural equipment and commercial applications such as vending machines. The application of the electric motor tends to influence whether AC or DC is selected. The key is that as the rotor passes through the horizontal position, the poles of the electromagnet flip.