1. According to the working power supply varieties division: can be divided into dc brushless dc motor and ac brushless dc motor. 1)Dc motor can be divided according to the structure and working principle: brushless dc motor and brushless dc motor. A brush dc motor can be divided into: permanent magnet dc motor and the electromagnetic dc motor. Electromagnetic dc motor division: the series wound dc motor, shunt dc motor, and compound dc motor separately excited dc motor. Permanent magnet dc motor division: rare earth permanent magnet dc motor, ferrite permanent magnet dc motor and aluminum nickel and cobalt permanent magnet dc motor. 2)The ac brushless dc motor can also be divided: single phase brushless dc motor and three-phase brushless dc motor. 2. According to the structure and working principle can be divided into: can be divided into direct current motor, asynchronous motor, synchronous motor. 1)Synchronous brushless dc motor can be divided into: permanent magnet synchronous motor, synchronous motor and magnetic resistance hysteresis synchronous motor. 2)Asynchronous brushless dc motor can be divided into: ac induction motor and motor commutator. Induction motor can be divided into: the three-phase asynchronous motor, single-phase asynchronous motor and cover pole asynchronous motor, etc. Ac commutator motor can be divided into: single-phase series motor, ac/dc motor and repulsion motor. 3. According to the start-up and operation mode can be divided into: capacitor start type single-phase asynchronous motor, capacitor operation type single-phase asynchronous motor, single-phase capacitor start running type asynchronous motor and split-phase single-phase asynchronous motor. 4. According to use can be divided into: driving motor and motor control. 1)Drive motor can be divided into: electric tools (Including drilling, polishing, grinding, slotting, cutting, reaming tools etc. )Motor, household appliances,Including washing machines, electric fans, refrigerators, air conditioner, tape recorder, video recorder, VCD, vacuum cleaner, camera, hair dryer, electric shaver, etc. )General motor and other small machinery and equipment (Including all kinds of small machine tools, small machinery, medical equipment, electronic instruments, etc. )Motor. 2)Control motor divided again: stepping motor and servo motor, etc. 5. According to the structure of the rotor can be divided into: cage induction motor (The old standard called squirrel-cage asynchronous motor)And wound rotor induction motor,The old standard called wound asynchronous motor)。 6. According to the running speed can be divided into: high speed motor, motor at low speed, constant speed motor and speed regulating motor. Low speed motor is divided into geared motor, electromagnetic reducer motors, torque motor and claw pole synchronous motor, etc. Speed regulating motor in addition to the levels can be divided into constant speed motor and constant speed motor, variable speed motor and stepless variable speed motor, also can be divided into electromagnetic speed regulating motor, dc speed regulating motor, PWM variable frequency speed regulating motor and switched reluctance motor speed control. Asynchronous motor rotor speed is always less than synchronous speed of the rotating magnetic field. Synchronous motor rotor speed has nothing to do with the size of the load and always stay for the synchronous speed.
