The permeance
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ize objects (like TV screens, audio tapes, vcr tapes) or to hold objects. However, due to the inductance of the electromagnet, the AC current that will actually flow will be reduced when compared to a DC voltage equal to the RMS value of the AC voltage feeding the electromagnet.key importance of an electromagnet is the ability to control the strength of the magnetic flux density, the polarity of the field, and the shape of the field. The strength of the magnetic flux density is controlled by the magnitude of the current flowing in the coil, the polarity of the field is determined by the direction of the current flow, and the shape of the field is determined by the shape of the iron core around which the coil is wound.electromagnets are used in lots of things. Motors are the most prominent example. Every electric motor uses at least one electromagnet. Most use two, one stationary and one moving. Sometimes one or the other of them is a permanent magnet. Generators, being the alter ego of motors, also use electromagnets. Loudspeakers and earphones use electromagnets to drive the diaphragm. Televisions use electromagnets to direct the electron beam on the screen. Scrap heaps use electromagnets to pick up large ferrous items like junked cars. Also fire doors as they can shut after detecting a fire the doors lock after a few minutes so people are safe outside and dont return back into the building.
REFERENCES
1.Лоптев - Справочник по высокоточным электрическим аппаратам
2.Буткевич Г.В., Дегтярь В.Г., Сливинская А.Г. Задачник по электрическим аппаратам. - М.: Высшая школа, 1987. - 232 с
.Таев И.С. Электрические аппараты: Общая теория. - М.: Энергия, 1977. 272 с.
.Сахаров В.П. - Проектрирование электрических аппаратов. Общие вопросы проектирования: Учебное пособие для студентов электротехнических вузов. - М.: Энергия, 1971. - 560 с.
.Буль Б.К., Буткевич Г.В., Годжелло А.Г. и др. Основы теории электрических аппаратов/ Под ред. Г.В. Буткевича. - М.: Высшая школа, 1970.- 600 с.
6.Electromagnets design: Performance guide for the course design on the subject: "The fundamentals of electrical apparatuses theory" for the students of the speciality 8.092206 - " Electrical machines and apparatuses" /Comp.: O. V. Blyznjakov. - Zaporihzhza: ZNTU, 2005. - 17 p.