Electric machine (commonly known as "motor") refers to an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. It is divided into electric motors (symbol M) and generators (symbol G). 1. According to the 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. According to 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
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