A motor is an electrical device that converts electrical energy into mechanical energy and is the most common electrical device. Electric motors are generally divided into two categories: AC motors and DC motors.
1. AC motor
AC motors are divided into two categories: asynchronous motors and synchronous motors.
1) Asynchronous motor
Asynchronous motors are widely used because of their simple structure, reliable operation, convenient maintenance, and high efficiency. However, due to poor speed regulation performance and low power factor, it cannot completely replace DC motors and synchronous motors in production.
AC asynchronous motors are divided into single-phase asynchronous motors and three-phase asynchronous motors. Single-phase asynchronous motors are mostly used in household appliances and automatic devices; three-phase asynchronous motors are widely used in industrial and agricultural production. There are two types of three-phase asynchronous motors: squirrel cage type and wound type.
2) Synchronous motor
Synchronous motors are suitable for constant speed and high power dragging occasions, such as driving large water pumps, air compressors, large blowers, etc. There are two types of synchronous motors: rotating armature type and rotating magnetic pole type.
2. DC motor
DC motor is a device that converts electrical energy and mechanical energy based on the principle of electromagnetic induction. It has good starting performance, speed regulation performance and overload capacity. It is mainly used in the fields of transportation, starting, steel rolling and automatic control. However, due to the disadvantages of complex structure, high manufacturing cost, and heavy operation and maintenance workload, the use of DC motors is limited to a certain extent. DC motors are divided into separate excitation motors, shunt excitation motors, series excitation motors, and compound excitation motors.