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I. Types of magnets
There are many types of magnets, including permanent magnets, electromagnets and soft magnets. Among them, permanent magnet is a kind of magnet made of rare earth elements, which has strong magnetic force and can maintain stability for a long time, and is widely used in motor, instrument and other industries. Electromagnet is a kind of magnet that generates magnetic field through current, which can be used in electromagnet sucker, brake and other occasions. Soft magnet is a special magnet material, which is mainly used in the fields of electronics and communication, and can reduce energy storage and energy loss in high-frequency electromagnetic fields.
Second, the magnitude of magnetic force
The magnetic force of a magnet is related to its size, material and magnetic circuit shape. Magnets of the same size and different materials have different magnetic forces. Generally, permanent magnet has strong magnetic force, which can maintain stability for a long time, but the magnetic force is greatly affected by temperature. The magnetic force of electromagnet can be changed by adjusting the current, but it needs continuous power supply from external power supply, so it can’t keep the magnetic force for a long time.
Third, durability
The durability of a magnet means that it will not lose its stable magnetic force after long-term use. Generally speaking, permanent magnets have good durability and can maintain stable magnetic force for a long time. But its durability is also affected by temperature, and too high temperature will affect the magnetic force. The durability of electromagnet is poor, because its magnetic force is directly related to the current. Once the current disappears, the magnetic force will disappear.