3, Switched reluctance motor
Switched reluctance motor is a new type of speed-regulating motor developed in the past 20 years. It has the advantages of simple and reliable, high-efficiency operation in a wide speed and speed range, four-quadrant operation, fast response speed and lower cost. But its shortcomings are also many: large torque fluctuations, large vibration, large noise; system nonlinearity, difficult modeling, high control cost, low power density, and so on.
4, Transverse field motor
Transverse field motor was first proposed by the famous German motor expert H. Weh in the late 1980s and used it on electric ships and electric vehicles. Compared with other motors, the transverse magnetic field motor has some advantages: the circuit and the magnetic circuit are decoupled, and the design freedom is greatly improved; the high torque density is about 5 to 10 times that of the standard industrial asynchronous motor, and it is especially suitable for application Low-speed, high-torque and other occasions are required; the winding type is simple, there is no end of the traditional motor, the winding utilization is high; each phase is independent of each other; the efficiency is high; the control circuit is the same as the permanent magnet brushless motor, and the controllability is good. At present, many transverse magnetic field motors for electric vehicles have been successfully developed abroad, and preliminary research is also being actively carried out in China. Of course, transverse magnetic field motors also have many shortcomings: the number of permanent magnets is large, the amount is large, the structure is complex, the process requirements are high, the cost is high, the magnetic leakage is serious, the power factor is low, the self-positioning torque is large, and so on.