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Electromagnet principle Introduction description

An energized solenoid with an iron core is called an electromagnet. When the core is inserted inside the energized solenoid, the core is magnetized by the magnetic field of the energized solenoid. The magnetized core also becomes a magnet, so that the magnetic properties of the solenoid are greatly enhanced by the superimposition of two magnetic fields. In order to make the electromagnet more magnetic, the iron core is usually made into a hoof shape. However, it should be noted that the coils on the hoof-shaped iron core are wound in the opposite direction, clockwise on one side and counterclockwise on the other. If the winding direction is the same, the magnetization of the iron cores of the two coils will cancel each other and the core will not be magnetic. In addition, the core of the electromagnet is made of soft iron and cannot be made of steel. Otherwise, once the steel is magnetized, it will maintain its magnetic properties for a long period of time without demagnetization. Therefore, the magnetic strength of the steel cannot be controlled by the size of the current and lose the advantages that the electromagnet should have. I. Overview 1. Magnet working principle The working principle of electromagnet is to use the principle of electromagnetic induction, and the magnetic field is mainly designed and calculated using the Biot-Savart law and Kirchhoff's law. 2, the size of the magnetic field generated by the electromagnet General electromagnet produced by pure iron, can produce 2.2T magnetic field strength, if you use high Bs magnetic materials, the magnetic field can reach 2.6T or more. If superconducting materials are used, high magnetic field strengths of 3--10T can be produced. 3, the type of electromagnet cooling Natural air-cooled type: measuring electromagnet, intermittent, discontinuous use of electromagnet full load occasions. Forced air-cooled type: Axial fan cooling, this low cost, suitable for some measurement occasions. External water-cooled type: Through the tap water to cool the wire bag and the core column, the water and electricity system are separated. Built-in water-cooled type: using tap water to cool the wire bag and the core column, water and electricity adopt a system, the best cooling effect, but the highest price. 4. New choice for water cooling: Tap water cooling: the price is a little low, a little waste of water, need to drain, and the effect is good. Circulating water cooling: need to increase the circulating cooling device, do not need drainage, no scale, save water, and the effect is good. 5, the choice of cooling method The cooling method should be determined according to their own use of the occasion, different cooling methods, cooling effect is not the same. In short, the cooling method is determined by actual needs. If 70% of the load, continuous work more than 24 hours, you have to use built-in water cooling in order to get satisfactory results. Second, the product range Design, implementation, research, testing of the electromagnetic field, various types of electromagnets and current sources. Repair various types of electromagnets. Third, product characteristics: 1, the design is reasonable, low power consumption, good cooling effect, beautiful style. 2. The surface treatment technology is first-class, reflects noble quality, and is fully compatible with your key laboratory and test site environment. 3, the stability of magnetic induction requirements, the size of the uniform area can be specified.

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