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1. Development history of coil electromagnet
In 1820, the current magnetic effect discovered by the Dane Erster showed the correlation between electricity and magnetism. Around 1825, the Englishman Sturgeon wrapped a metal wire carrying current around an insulated iron rod , made the magnet winding wire.
2. Coil electromagnet structure.
The coil electromagnet is still made of the outer frame, the coil (mainly made of copper wire, coated with a layer of insulating material to integrate), the iron core (made of soft magnetic material, soft, magnetic material, easy to obtain magnetism, magnetic existence time is short steel It is a hard magnetic material, and it is difficult to obtain magnetism. If magnetism is obtained, the magnetism can exist for a long time. It will also change the permanent magnet)
3. The principle of electromagnet coil
Magnet winding wire is divided into two types: push type and pull type. When the coil is energized, the coil generates magnetism, which drives the magnet to move. After the coil is powered off, there is no reset, and it needs to be reset by a spring. During operation, the casing is screwed on the fixed bracket, and the armature is connected to the drawbar, and the armature's moving mechanism is connected to the drawbar. When the suction coil passes electricity, the armature is sucked, and it is driven by the connecting rod. managed structure. When the power is turned off, the rest of the driven structures return to their previous positions, and the action ends.
The working air gap of the electromagnet is at the upper part of the moving railway, and the electromagnetic force is upward after electrification (proportional relief valve); the working air gap of the electromagnet is at the lower part of the moving railway, and the electromagnetic force is downward after electrification (inverse proportional overflow valve). To put it simply, the suction of the ordinary electromagnet is strong at both ends, and the electromagnet of the proportional valve has been modified. One end of the electromagnet has a strong suction, the other end is weak, and the middle of the push rod is a cylinder. Therefore, as soon as the power is turned on, it is sucked to the stronger end, so the direction of the push rod movement has nothing to do with the electricity, and the electricity will affect the magnitude of the electromagnetic force.
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