Stupidly confused? The difference between electromagnet and permanent magnet is here!

by:Zhongke     2021-03-30
The difference between electromagnets and permanent magnets Electromagnets (solenoids) are a kind of equipment that generates electromagnetism when energized, which converts electrical energy into magnetic energy, and then from magnetic energy into kinetic energy (electrical energy → magnetic energy → kinetic energy). The first thing is to wind a conductive winding that matches its power on the outside of the iron core. This current-carrying coil has the same magnetism as a magnet, and it is also called an electromagnet. We generally make it into a strip or hoof shape to make the iron core easier to magnetize. In order to demagnetize the electromagnet immediately after power failure, we often use soft iron or silicon steel materials that demagnetize faster. Such an electromagnet has magnetism when it is energized, and the magnetism disappears after the power is off. Electromagnets are extremely widely used in our daily lives. Due to its creation, the power of generators has also been greatly improved.   Electromagnets can be divided into two types: DC electromagnets and communication electromagnets. If electromagnets are distinguished according to their uses, the following five types of dividends can be divided:    traction electromagnets-mainly used to pull mechanical equipment, open or close various valves, in order to fulfill the mission of active control.   Lifting electromagnet──Used as a lifting device to lift ferromagnetic materials such as steel ingots, steel materials, and iron sand.  Brake electromagnet──It is mainly used to brake the motor to achieve the purpose of precise parking.  The electromagnetic system of active electrical appliances──such as the electromagnetic system of electromagnetic relay and contactor, the electromagnetic tripper of active switch and the operating electromagnet, etc.   Electromagnets for other purposes ─ ─ such as the electromagnetic chuck of the grinder and the electromagnetic vibrator, etc. Permanent magnet, namely permanent magnet, can be natural product, also known as natural magnet, or artificially made (the strongest magnet is neodymium iron boron magnet). It has wide hysteresis loop and high coercivity , High remanence, once magnetized, it can maintain stable magnetic material. Also known as permanent magnetic materials, hard magnetic materials. In use, the permanent magnet works in the demagnetization part of the second quadrant of the magnetic Ray loop after deep magnetic saturation and magnetization. The permanent magnet should have the highest possible coercive force Hc, remanence Br and maximum magnetic energy product (BH)m to ensure the storage of maximum magnetic energy and stable magnetism. Mainstream permanent magnet: rare earth permanent magnet material (neodymium iron boron Nd2Fe14B), the strongest magnet now. The use of electromagnet    A. Crane: It is a powerful electromagnet for industrial use, which can pass high current and can be used to lift steel plates, containers, scrap iron, etc.  B. Telephone  C. Ammeter, voltmeter, galvanometer  D. Electric bell, etc.  E. Automatic control equipment   F. Industrial automatic control and office automation.  G. Packaging machinery, medical equipment, food machinery, textile machinery, etc.  H. Electromagnetic relay   I. Application of permanent magnets for magnetic levitation trains Permanent magnets are widely used in various fields such as electronics, electrical, machinery, transportation, medical treatment and daily necessities. A. Permanent magnets of loudspeakers and telephone receivers; magnetic systems of magnetoelectric meters;    B. magnetic poles in generators and permanent magnet motors;    C. permanent magnet devices used in machine manufacturing (such as permanent magnet chucks for surface grinders, etc.) and Magnetic levitation system, magnetic bearing;   D. Magnetic separation system, magnetic separation system, magnetic purification water system, magnetron, magnetic system of proton accelerator, etc. The difference between the two   1. The magnetic pole of the electromagnet can be changed, which is determined by the positive and negative poles of the energized solenoid and the winding direction of the coil. The permanent magnet pole is fixed N↔S.   2. The magnetism of the electromagnet can be changed, that is, it has magnetism when it is energized, and there is no magnetism if it is not energized. The magnetism of permanent magnets has nothing to do with electricity.  3. The magnetic force of the electromagnet can be changed, which is related to the number of turns and current of the coil, and also related to the magnetic material and the planned structure. The magnetic force of the permanent magnet is relatively stable at a peak level. It is mainly affected by the external magnetic field and high temperature, and the storage time is related.u200b
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