Push pull electromagnet is widely used in low-voltage electrical products. This website discusses the structure, parameters, core information, failure phenomenon, causes and elimination methods of push-pull electromagnet. 1 Structure of push-pull electromagnet. Push pull electromagnet is used in many low-voltage electrical products, such as circuit breaker, connector, relay, push-pull electromagnet, etc. "Push pull electromagnet" is generally composed of iron core [static iron core (main pole iron core), moving iron core (armature)], line cabinet, magnetic separation ring (short circuit ring, which is used to communicate push-pull electromagnet), reaction force tension spring, magnetic yoke, etc. according to the structure type, it can be divided into: beat close type, method e method, tube type, rotary type, etc., and the more widely used are beat close type, shape and E shape; According to the excitation method of push-pull electromagnet, it can be divided into DC and communication; According to its use, it can be divided into two types: current coil and voltage coil (short circuit maintenance instantaneous push-pull electromagnet of circuit breaker, overload of hydraulic release, short circuit maintenance coil and current relay coil are current coil; undervoltage release, shunt release and voltage relay are voltage coil); according to its working system, it can be divided into eight hour working system, Continuous working system, intermittent periodic working system, etc.
Information for push pull electromagnet core
(1) For short-time push-pull electromagnet, such as shunt release, instantaneous push-pull electromagnet of circuit breaker, low steel (such as Q235-A) can be selected as its core because hysteresis loss is not considered. Push type electromagnet such electromagnet has magnetism when it is powered on, and then the magnetism disappears after it is powered off. Electromagnet is widely used in our daily life. Because of its invention, the power of generator has been greatly improved. The push-pull electromagnet is wound on the outside of the iron core with a conductive winding matching its power. The coil with current is magnetic like a magnet, which is also called frame electromagnet.
(2) Because DC push-pull electromagnet has no hysteresis loss (but there is still eddy current) and the loss of its core is small, it can be processed easily with cylindrical carbon steel or pure iron bar
(3) Because the magnetic conductor (core) of communication push-pull electromagnet has iron loss (hysteresis loss) and copper loss (eddy current loss) under communication excitation, and they are often in eight hour operation system or even uninterrupted operation system (such as undervoltage release) or intermittent periodic operation system (such as contact device) with large loss in operation, silicon steel lamination (inter slice insulation) is selected for core data. Sucker electromagnet, also known as lifting electromagnet, is a new type of practical magnetic lifting equipment with strong practicability; In the lifting and handling of materials, there is no need to bundle the scattered materials and other treatment, so it is also known as the bulk lifting electromagnet, which is very suitable for lifting and handling the scattered scrap iron and steel, waste and so on.
(4) The iron core with small volume and high precision (such as under voltage release of some small volume circuit breakers, electromagnetic release of residual current operated circuit breakers, etc.) should be made of iron nickel soft magnetic alloy (permalloy) with small remanence, small coercivity and small hysteresis loop area
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