Definition: An electromagnetic device that realizes the conversion or transmission of electrical energy according to the law of electromagnetic induction. Electric motor is also called (commonly known as motor), in the circuit with the letter “M” (the old standard with “D”). Its main role is to produce driving torque, for electrical appliances or various machinery power source.

Generators are indicated by the letter “G” in the circuit. Its main role is to use mechanical energy into electrical energy, the most commonly used is the use of heat, water and other driving generator rotor to generate electricity, with the wind power generation technology is becoming more and more mature, wind power is also slowing into our lives. Transformer, in some books called stationary motor. From the definition of the motor found, so that there is also a reason for it.

Types of electric motors

1. According to the type of working power supply: can be divided into DC motor and AC motor.

1.1 DC motor according to the structure and working principle can be divided into: brushless DC motor and brush DC motor.

1.1.1 Brush DC motor can be divided into: permanent magnet DC motor and electromagnetic DC motor.

1.1.1.1 Electromagnetic DC motor division: series-excited DC motor, parallel-excited DC motor, other-excited DC motor and compound-excited DC motor.

1.1.1.2 permanent magnet DC motor division: rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and alnico permanent magnet DC motor.

1.1 which AC motors can also be divided into: single-phase motors and three-phase motors.

2 according to the structure and working principle: can be divided into DC motor, asynchronous motor, synchronous motor.

2.1 synchronous motor can be divided into: permanent magnet synchronous motor, reluctance synchronous motor and hysteresis synchronous motor.

2.2 Asynchronous motors can be divided into: induction motors and AC commutator motors.

2.2.1 Induction motors can be divided into: three-phase asynchronous motors, single-phase asynchronous motors and shaded-pole asynchronous motors.

2.2.2 AC commutator motors can be divided into: single-phase series-excited motors, AC and DC dual-use motors and push-repulsion motors.

3. According to the starting and running mode: capacitor starting single-phase asynchronous motor, capacitor running single-phase asynchronous motor, capacitor starting and running single-phase asynchronous motor and split-phase single-phase asynchronous motor.

4. Divided by use: electric motors for driving and control motors.

4.1 drive motor division: electric tools (including drilling, polishing, grinding, slotting, cutting, reaming and other tools) with electric motors, home appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, VCRs, video recorders, video disk players, vacuum cleaners, cameras, hairdryers, electric shavers, etc.) with electric motors and other general-purpose small machinery and equipment (including a variety of small machine tools, small machines.), Medical equipment, electronic instruments, etc.) with electric motors.

4.2 control motor and divided into: stepper motor and servo motor. 5.

5. According to the structure of the rotor: cage-type induction motor (the old standard called squirrel-cage asynchronous motor) and wound rotor

Induction motor (the old standard is called wire-wound asynchronous motor).

6. Divided by running speed: high speed motor, low speed motor, constant speed motor, speed control motor. Low-speed motor is divided into gear motor, electromagnetic reduction motor, torque motor and claw pole synchronous motor.

Speed motors can be divided into step constant speed motor, stepless constant speed motor, stepless variable speed motor and stepless variable speed motor, but also can be divided into electromagnetic speed motor, DC speed motor, PWM frequency conversion speed motor and switched reluctance speed motor.