As a Magnetic Switch China Supplier, share with you. An electromagnetic switch is a switch controlled by an electromagnet, which is a combination of an electromagnet and a switch. When the electromagnet coil is energized, electromagnetic attraction is generated, and the movable iron core pushes or pulls the switch contact to close, thereby connecting the controlled circuit. Electromagnetic switches have a wide range of applications in various industries, and the most common is the contactor in the industrial field. The electromagnetic switch is the control switch on the starter. It is one of the three major components of the starter (DC motor, transmission meshing mechanism, electromagnetic switch). Its working principle is to generate electromagnetic attraction after the coil is energized, which causes the movable iron core to move, thereby pulling on the one hand The transmission meshing mechanism makes the starter pinion move forward and meshes with the engine flywheel ring gear. On the other hand, it pushes the switch contact to connect, so that the DC motor is energized to run, thereby driving the engine to start.

Hall Magnetic Switch

The starter electromagnetic switch is the key component of the starter, and the design quality of the electromagnetic switch directly affects the reliability of the starter.

The starter electromagnetic switch has two functions. One is to connect the main circuit to make the starter rotate, and the other is to push the drive gear out through the fork to mesh with the flywheel gear ring of the engine, so the electromagnetic switch is required to have corresponding suction and corresponding stroke. , The contacts can reliably make and break large currents. In addition, it is required to reduce the volume and weight as much as possible.

Based on the above characteristics, the contact structure of the electromagnetic switch generally adopts the contact form, that is, the movable contact is made into a bridge or disc shape, so that it has a larger heat dissipation surface and heat capacity. The magnetic system mostly adopts solenoid type electromagnet structure to meet the requirements of corresponding stroke, corresponding suction, small size and light weight.

The moving iron core of the electromagnetic switch can move smoothly in the brass bushing equipped with solenoid coils. The moving iron core rod is connected by the fork unidirectional device. Under the action of the return spring, the moving iron core is usually kept at the initial non-working position. When starting, the drive gear of the starter should move forward about 12-20mm. Therefore, when the electromagnetic switch starts to attract, a large magnetic potential is required to generate the necessary initial suction. After the suction, the air gap is reduced , The electromagnetic attraction force increases sharply, which greatly exceeds the force required to maintain the attraction state.

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