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A DC motor is a rotating electrical machine that can convert DC electrical energy into mechanical energy (DC motor) or convert mechanical energy into DC electrical energy (DC generator). It is a motor that can convert DC electrical energy and mechanical energy to each other. When it is used as a motor, it is a DC motor, which converts electrical energy into mechanical energy; when it is used as a generator, it is a DC generator, which converts mechanical energy into electrical energy. The structure of a DC motor should be composed of a stator and a rotor. The stationary part of a DC motor is called the stator. The main role of the stator is to generate a magnetic field. It consists of the base, the main magnetic pole, the commutating pole, the end cover, the bearing and the brush device. The part that rotates during operation is called the rotor. Its main function is to generate electromagnetic torque and induced electromotive force. It is the hub of DC motors for energy conversion. Therefore, it is also commonly called an armature. It consists of a rotating shaft, armature core, armature winding, and Components such as commutators and fans.