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I read an electronic magazine in which there is a report on magnets used in a magnetic train, just like this: 106MG10-BP http://www.kynix.com/Detail/23066/106MG10-BP.html. After reading, I became interested in this topic, so I searched some related information about magnets, but found that it is not specific at all. Thus today, I come to turn to you to discuss my understandings are appropriate. Here are my following understandings: Internal with iron core, the use of current through the coil so that it has a magnetic like a magnet device called electromagnet (electromagnet). Usually made of strip or hoof. Core to use easy to magnetize, and easy to disappear magnetic iron or silicon steel to make. This electromagnet in the power when there is magnetic, after the power will disappear. Electromagnets in the daily life has a very wide range of applications. The invention of the electromagnet also makes the power of the generator much improved. Applications Electromagnets in the daily life has a very wide range of applications. Electromagnets are an application of the current magnetic effect (electromagnetism), which is closely linked to life, such as electromagnetic relays, electromagnetic cranes, maglev trains and so on. Electromagnets can be divided into two types of DC electromagnets and AC electromagnets. If the electromagnet is divided according to its use, it can be divided into the following five types: (1) traction electromagnet - mainly used to traction machinery, open or close the various valves to perform automatic control tasks. (2) lifting electromagnet - used as a lifting device to lift steel ingots, steel, iron and other ferromagnetic materials. (3) brake electromagnet - mainly used to brake the motor to achieve the purpose of accurate parking. (4) automatic electrical electromagnetic system - such as electromagnetic relays and contactor of the electromagnetic system, automatic switching of the electromagnetic release and operation of electromagnets, and so on. (5) other uses of the electromagnet - such as grinder electromagnetic chuck and electromagnetic vibrator. Principles When the solenoid is energized, a magnetic field such as a magnet bar can be produced. The circle in the figure is the cross section of the wire, and the point represents the current out of the screen, and the fork is on the screen; the elliptical circle with the arrow is the magnetic field. A magnetic field is generated when the direct current passes through the conductor, and a magnetic field similar to the rod-shaped magnet is generated by forming the conductor of the solenoid. The addition of a magnetic substance to the center of the solenoid causes the magnetic substance to be magnetized to achieve the effect of enhancing the magnetic field. In general, the magnetic field produced by the electromagnet is related to the size of the direct current, the number of coils and the magnetic material of the center. In the design of the electromagnet, the distribution of the coil and the choice of the guide material are emphasized and controlled by the size of the DC Magnetic field strength. However, the material of the coil has resistance to limit the size of the magnetic field produced by the electromagnet, but with the discovery and application of superconductors will have the opportunity to break through the existing limitations. Those are my understandings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help me ? thanks in advance.