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Electromagnetic switch, a switch device controlled by electromagnetic. According to the principle of electromagnetic induction, when a current is passed to a conductor (coil), the coil will generate a corresponding magnetic field; at the same time, the conductor in the magnetic field is subjected to ampere force to produce a directional movement (movement).


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. A push rod is fixed at the front end of the movable iron core, a switch contact plate is installed at the front end of the push rod, and the rear section of the movable iron core is connected with the shift fork by an adjusting screw and a connecting pin. A return spring is installed on the outside of the copper sleeve to reset movable parts such as the movable iron core.


Structure and main function of electromagnetic switch

The structure and working principle of electromagnetic switch. The electromagnetic switch is mainly composed of a pull coil, a holding coil, a movable iron core, and a contact plate. The pull coil is connected in series with the motor, and the coil is kept in parallel with the motor, and the iron is directly grounded. The movable iron core-end controls the conduction of the main circuit through the contact plate;


Structure and main function of electromagnetic switch


The main function of electromagnetic switch:


As a mechanism to connect or disconnect the circuit between the battery and the starter.


(1) During the switch-on process, the switch coil is energized to generate electromagnetic attraction, which causes the moving iron core to move, so that on the one hand, the shift fork is pulled to make the starter drive pinion move forward to mesh with the engine flywheel ring gear, and on the other hand, the moving contact is pushed The movable contact piece is connected with the contact screw contact, the circuit between the battery and the starter is connected, and the DC motor is energized to run, thereby driving the engine to start.


(2) In the process of disconnection, the main circuit is disconnected and the starter drive pinion gear is disengaged from the flywheel ring gear and retreated smoothly.