Definition and Classification of Electric Motors

Release date:

2025-07-24

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Abstract

A motor is an electromechanical device that utilizes the interaction between electricity and magnetism to convert and transmit energy. Broadly speaking, motors include electric motors, generators, and specialized motors.

An electric motor is an electromechanical device that utilizes the interaction between electricity and magnetism to convert and transmit energy. Broadly speaking, motors encompass electric motors, generators, and specialized motors. Electric motors draw electrical energy from power systems and deliver mechanical energy to mechanical systems; they are widely used across various sectors of the national economy as well as in household appliances—primarily serving as the driving force behind diverse types of machinery. Generators, on the other hand, absorb mechanical energy from mechanical systems and output electrical energy into power grids. Thanks to advancements in generator technology and related equipment, we can now harness a wide range of energy sources—including thermal, hydro, nuclear, wind, solar, and biomass—to generate electricity, thereby supplying essential power to industries, businesses, and households nationwide. Finally, specialized motors refer specifically to motors designed for unique applications, environments, production processes, or technical standards—distinguishing them clearly from conventional motors.
From a structural perspective, although different types of motors have varying designs, they typically consist of three main components: the stationary part, the rotating part, and the auxiliary part. The stationary part is primarily composed of structural elements such as the stator frame, stator housing, stator core, stator windings, end covers, and baseplate—each serving functions like magnetic conduction, electrical conduction, and mechanical support. The rotating part of the motor includes components like the rotor shaft, rotor core, rotor支架 (rotor support), rotor windings, commutator rings, commutators, and the fan. Meanwhile, the auxiliary part comprises components such as bearings, brushes, and coolers.
Classified by their energy conversion method, motors can be divided into generators and electric motors; classified by their power supply method, they are further categorized into DC motors and AC motors.

Keywords:

Market Analysis of China's Electric Motor Industry

Motor Industry Value Chain Analysis

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