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Its working principle is the process of energy conversion based on ampere's law that we come into contact with in junior high school physics, that is, the effect of the electric conductor on the force in the magnetic field. The motor includes such parts as the necessary armature, commutator, pole, brush, bearing and housing.
An engine must be turned by external forces before it can run under its own power. The process in which an engine transitions from a stationary state to a self-running state with the aid of an external force is called starting of the engine. There are three common starting modes of engine: manual starting, auxiliary gasoline engine starting and electric starting. Manual starting adopts the method of rope pulling or hand shaking, which is simple but inconvenient, and the labor intensity is large. It is only suitable for some low-power engines, and is only reserved as a backup mode in some cars. Auxiliary gasoline engine starting is mainly used in high-power diesel engine; The electric starting mode is easy to operate, quick to start, has the ability of repeated starting, and can be controlled remotely, so it is widely used by modern cars.