With the rapid development of industrial and agricultural production and the increase in the degree of mechanization and automation, the demand and types of motors are also increasing.

There are many types of coolers. It is necessary to properly classify the motors.

There are many classification methods of motors. For example, according to different purposes and conditions of use, motors can be divided into general-purpose motors, marine motors, explosion-proof motors, petrochemical motors, tropical motors and other special motors.

According to the protection type of the motor shell, it can be divided into: open type, protective type, closed type and so on.

Motivation is also called (commonly known as motor), which is represented by the letter "M" (old standard used "D") in the circuit.

Its main role is to generate driving torque, as a power source for electrical appliances or various machinery.

The generator is indicated by the letter “G” in the circuit.

Its main function is to convert mechanical energy into electrical energy. At present, the most commonly used is to use thermal energy, water energy, etc. to propel the generator rotor to generate electricity. With the maturity of wind power technology, wind power has slowly come into our lives.

Transformers are called stationary motors in some books.

I found from the definition of the motor, so to speak also makes sense.