The control device of the car starter includes an electromagnetic switch, a starter relay, and an ignition start switch lamp component, and the electromagnetic switch is made together with the starter.

1. Electromagnetic switch

1. Structural characteristics of electromagnetic switch

The electromagnetic switch is mainly composed of an electromagnet mechanism and a motor switch. The electromagnet mechanism is composed of a fixed iron core, a movable iron core, an attracting coil and a holding coil. The fixed iron core is fixed and the movable iron core can move axially in the copper sleeve. The front end of the movable iron core is fixed with a push rod, and the front end of the push rod is equipped with a switch contact disc. The rear section of the movable iron core is connected with the shift fork with an adjusting screw and a connecting pin. A reset spring is installed on the outside of the copper sleeve to reset movable parts such as the movable iron core. The arrangement position of the electromagnetic switch wiring terminal is as shown in the figure

2. Working principle of electromagnetic switch

When the magnetic flux generated by the attracting coil and the holding coil are in the same direction, their electromagnetic attraction forces are superimposed on each other, which can attract the movable iron core to move forward until the contact plate at the front end of the push rod turns on the electric switch contact potential. The main circuit of the motor is connected. .

When the magnetic pain generated by the attracting coil and the holding coil are in opposite directions, the electromagnetic attraction force cancels each other out. Under the action of the return spring, the movable iron core and other movable parts are automatically reset, the contact disc is disconnected from the contact, and the main circuit of the motor is disconnected .

2. Starting relay

The structure diagram of the starting relay is shown in the upper left corner of the figure, which is composed of an electromagnet mechanism and a contact assembly. The coils are respectively connected to the ignition switch terminal and ground terminal "E" on the shell, the fixed contact is connected to the starter terminal "S", and the movable contact is connected to the battery terminal "BAT" via the contact arm and bracket. The starter relay is a normally open contact for electric shock. When the coil is energized, the iron core of the relay generates electromagnetic force to close the contacts, thereby turning on the attraction coil and the holding coil circuit controlled by the relay.