The starter is divided into DC starter, gasoline starter, compressed air starter and so on according to the working principle. Most of the internal combustion engines use DC starters, which are characterized by compact structure, simple operation and easy maintenance. The gasoline starter is a small gasoline engine with a clutch and a transmission mechanism. It has high power and is less affected by the temperature. It can start a large internal combustion engine and is suitable for high and cold areas. Compressed air starters are divided into two categories, one is to drive compressed air into the cylinder according to the working order, and the other is to use an air motor to drive the flywheel. The use of compressed air starters is close to that of gasoline starters, and is usually used for starting large internal combustion engines.
The DC starter is composed of a DC series motor, a control mechanism and a clutch mechanism. It specifically starts the engine and needs a lot of torque, so the amount of current to be passed is huge, up to several hundred amps.
The DC motor has a large torque at low speed, and gradually decreases when the speed is high, which is very suitable for use as a starter.
The starter adopts a DC series-excited motor, and the rotor and stator parts are wound with relatively thick rectangular cross-section copper wires; the driving mechanism adopts a reduction gear structure; the operating mechanism adopts an electromagnetic magnetic attraction method.