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The basic knowledge of electromagnets
Nov 12 , 2021

A conductive winding that matches its power is wound on the outside of the iron core. This current-carrying coil has magnetism like a magnet, and it is also called an electromagnet. We usually make it into a square electromagnet or circular electromagnet shape to make the iron core easier to magnetize. In addition, in order to demagnetize the electromagnet immediately after power failure, we often use soft iron or silicon steel materials with faster demagnetization. Such an electromagnet has magnetism when it is energized, and the magnetism disappears after the power is off. Electromagnet has extremely wide application in our daily life, and the power of generator has been greatly improved due to its invention.


The scope of application of electromagnet


All kinds of small precision electromagnets and electromagnet application components, as actuators of automatic control systems, have been widely used in various fields such as industrial automation control, office automation, and medical equipment. Such as office equipment, imaging equipment, banking equipment, packaging machinery, medical equipment, food machinery, textile machinery, automatic sorting machines, automatic teller machines, vending machines, card punches, electromagnetic locks, various remote control devices, braking devices , Counting device, access control system, etc.


The main parameters of the electromagnet


Customers need to consider the following technical parameters for the electromagnet required or customized:


1. The maximum size that the electromagnet can accommodate: length; width; height.


2. The maximum stroke of the electromagnet and its suction force requirements, and the reset force requirements after power off.


3. The maximum voltage provided to the electromagnet power supply, current/voltage stability, AC/DC power supply, whether it can provide positive and negative pulse power.


4. Whether the electromagnet needs long-term uninterrupted work, intermittent work, the longest energization time each time and the shortest interval between two energizations.


5. Special environmental requirements for using electromagnets, such as temperature; humidity; shock; vibration; acceleration, etc.


Classification method of electromagnet


(1) Divided by current: Electromagnets can be divided into two types: DC circular electromagnets and AC electromagnets.


(2) Divided by action mode:


Holding type: such as electromagnetic clutch, electromagnetic chuck, lifting electromagnet, etc.


Attraction type: various automatic electrical relays, contactors, electromagnetic valves, electric hammers, electric bells, etc.


(3) Divided according to purpose:


1. Traction electromagnet: mainly used to traction mechanical devices, open or close various valves to perform automatic control tasks.


2. Lifting electromagnet: used as a lifting device to lift ferromagnetic materials such as steel ingots, steel materials and iron sand.


3. Brake electromagnet: Mainly used to brake the motor to achieve the purpose of accurate parking.


4. The electromagnetic system of automatic electrical appliances: such as the electromagnetic system of electromagnetic relay and contactor, the electromagnetic tripping device of automatic switch and the operating electromagnet, etc.


5. Electromagnets for other purposes: such as electromagnetic chuck of grinder, small mini holding electromagnet and electromagnetic vibrator.


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