Its working principle is the energy conversion process based on Ampere's law that we have come into contact with in junior high school physics, that is, the effect of force on a current-carrying conductor in a magnetic field. The motor includes the necessary components such as armature, commutator, magnetic poles, brushes, bearings and housing.
Before the engine can run under its own power, it must be rotated by an external force. The process in which the engine transitions from a static state to self-running with the help of external force is called engine starting. The commonly used starting methods of the engine include manual starting, auxiliary gasoline engine starting and electric starting. It is simple but inconvenient and labor-intensive. It is only suitable for some low-power engines, and it is only reserved as a backup method in some cars; auxiliary gasoline engine starting is mainly used in high-power engines. On the diesel engine; the electric starting method is easy to operate, starts quickly, has the ability to start repeatedly, and can be controlled remotely, so it is widely used by modern vehicles.