Motor information

Electric machine (commonly known as "motor") refers to an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Represented by the letter M in the circuit (old standard used D). Its main function is to generate driving torque as a power source for electrical appliances or various machinery. The generator is represented by the letter G in the circuit. Its main function is to convert electrical energy into mechanical energy. partition 

1. Classified by type of working power supply：It can be divided into DC motors and AC motors. 1) DC motors can be divided into brushless DC motors and brushless DC motors according to their structure and working principle. Brushed DC motors can be divided into permanent magnet DC motors and electromagnetic DC motors. Electromagnetic DC motors are divided into series excited DC motors, parallel excited DC motors, separately excited DC motors, and compound excited DC motors. Permanent magnet DC motors are divided into rare earth permanent magnet DC motors, ferrite permanent magnet DC motors, and aluminum nickel cobalt permanent magnet DC motors. 2) Among them, AC motors can also be divided into single-phase motors and three-phase motors. 

2. It can be divided according to its structure and working principle：It can be divided into DC motors, asynchronous motors, and synchronous motors. 1) Synchronous motors can be divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. 2) Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors can be divided into three-phase asynchronous motors, single-phase asynchronous motors, and shield pole asynchronous motors. AC commutator motors can be divided into single-phase series excited motors, AC DC dual purpose motors, and repulsive motors. 

3. It can be divided into starting and operating modes：Capacitor start single-phase asynchronous motor, capacitor run single-phase asynchronous motor, capacitor start run single-phase asynchronous motor, and split phase single-phase asynchronous motor. 

4.Classified by purpose：Drive motor and control motor. 1) Electric motors for driving can be divided into: electric motors for electric tools (including drilling, polishing, polishing, slotting, cutting, expanding, etc.) Electric motors for household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.) and other general small mechanical equipment (including various small machine tools, small machinery, medical equipment, electronic instruments, etc.). 2) Control motors are further divided into stepper motors and servo motors. 

5.According to the structure of the rotor, it can be divided into：Cage induction motors (formerly known as squirrel cage asynchronous motors) and wound rotor induction motors (formerly known as wound asynchronous motors). 

6.Divided by operating speed：High speed motor, low speed motor, constant speed motor, and variable speed motor. Low speed motors are further divided into gear reduction motors, electromagnetic reduction motors, torque motors, and claw pole synchronous motors. Speed regulating motors can be divided into stepless constant speed motors, stepless constant speed motors, stepless variable speed motors, and stepless variable speed motors. In addition, they can also be divided into electromagnetic speed regulating motors, DC speed regulating motors, PWM variable frequency speed regulating motors, and switched reluctance speed regulating motors. The rotor speed of an asynchronous motor is always slightly lower than the synchronous speed of the rotating magnetic field. The rotor speed of a synchronous motor is independent of the size of the load and always remains at synchronous speed.