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Similarities and differences between electromagnets and permanent magnets

Occasionally, some customers who need to purchase electromagnets come to us, but our company only provides permanent magnets. Electromagnets and permanent magnets are similar in some aspects, but there are also some significant differences. Below, permanent magnet manufacturer courage will introduce their similarities and differences.

Similarities between electromagnet and permanent magnet:

(1) Magnetism: Electromagnets and magnets are magnetic, able to attract iron, nickel, cobalt and other magnetic materials.

(2) Magnetic fields: They all produce magnetic fields that can attract or repulse other magnetic objects or objects with magnetic induction.

Application picture of permanent magnet and electromagnet;

Application diagram of permanent magnet and electromagnet;

There are more differences between electromagnets and permanent magnets,

(1) Reason for generating magnetic field: Magnets are made of materials with permanent magnetism, such as iron ore, neodymium iron boron, etc. They obtain permanent magnetism through specific processes or material characteristics during manufacturing. An electromagnet is a wire wound by a coil that generates a magnetic field. When a current passes through it, the current in the coil generates a magnetic field, which disappears when the current is cut off.

(2) Magnetic field strength adjustment: The magnetic field strength of magnets cannot be adjusted, and their magnetism is fixed. The magnetic field strength of an electromagnet can be adjusted by changing the current passing through the wire. Increasing the current will increase the strength of the magnetic field, while reducing or cutting off the current will reduce or eliminate the magnetic field.

(3) Controllability: Due to the adjustable magnetic field strength of electromagnets, they have higher controllability. A power supply can be used to control the current and turn on or off the magnetic field when needed. This makes electromagnets very useful in many applications, such as electromagnetic suction cups, electromagnetic door locks, etc.

(4) Energy demand: Electromagnets require an external power source to generate a magnetic field, as they rely on the current passing through the coil. Magnets are self-sufficient and do not require external energy to maintain magnetism.


Electromagnets rely on external power sources to generate a magnetic field, which is temporary and adjustable; A permanent magnet, on the other hand, is a material that has its own persistent magnetism, without the need for an external power source, and the magnetic field is stable and non adjustable.

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