Its working principle is the transformation process of energy based on the Ampere's law that we come into contact with physics in junior middle school, that is, the role of the conductive conductor in the magnetic field. The motor includes the necessary armatures, commutators, poles, brushes, bearings and housings.

The engine must rotate by external force before it runs on its own power. Engine with the help of external force from the static transition to the process of self-running, known as the engine start. The common starting method of the engine is manpower starting, auxiliary gasoline engine starting and power starting in three forms. Manpower start using rope pull or hand mode, simple but inconvenient, and labor-intensive, only applies to some low-power engine, reserved for some vehicles only as a backup; auxiliary gasoline engine is mainly used in high-power Diesel engine; power starting mode is easy to operate, start fast, with the ability to start repeatedly, and can be remotely controlled, the motor it is widely be used.