SU963572A2

SU963572A2 - Electrodynamic force exciter

Info

Publication number: SU963572A2
Application number: SU803005895A
Authority: SU
Inventors: Генрих Соломонович Росин; Лев Иосифович Устеленцев; Павел Яковлевич Гершман
Original assignee: Всесоюзный научно-исследовательский институт охраны труда и техники безопасности черной металлургии
Priority date: 1980-11-18
Filing date: 1980-11-18
Publication date: 1982-10-07

Description

Изобретение относитс к технической акустике и вибротехнике и может быть применено дл возбуждени или подавлени колебаний в конструкци х.The invention relates to technical acoustics and vibrotechnology and can be used to excite or suppress vibrations in structures.

В основном авт. св. № 882644 описан электродинамический силовозбудитель , примен емый в вибротехнике дл возбуждени или подавлени колебаний в конструкци х. Этот элек родинамический силовозбудитель выполнен в виде двух концентрично расположенных цилиндрических посто нных магнитов: внутреннего и внзцнего, причем внутренний цилиндрический посто нный магнит, на который намотана силова катушка, выполнен подвижным и соединен с внешним магнитом при помощи подвески. .Оба -посто нных магнита намагничены вдоль радиуса 1.Basically auth. St. No. 882644 describes an electrodynamic exciter used in vibrotechnics for exciting or suppressing vibrations in structures. This electrodynamic energizer is made in the form of two concentrically arranged cylindrical permanent magnets: internal and external, and the internal cylindrical permanent magnet on which the power coil is wound is made movable and connected to the external magnet by means of a suspension. Both permanent magnets are magnetized along radius 1.

Известный электродинамический силовозбудитель имеет разомкнутую магнитную цепь, что приводит к снижению величины магнитной индукции в воздушном зазоре между магнитами, а следовательно, и к уменьшению толкающей силы.The known electrodynamic energizer has an open magnetic circuit, which leads to a decrease in the magnitude of the magnetic induction in the air gap between the magnets, and consequently, to a decrease in the pushing force.

Целью изобретени вл етс увеличение толкающей силы за счет увеличени магнитной индукции воздушного зазора.The aim of the invention is to increase the pushing force by increasing the magnetic induction of the air gap.

Цель достигаетс тем, что в предлагаемьлй электродинамический силовозбудитель дополнительно введен магнитопровод , состо щий из внутренней и внешней частот, прикрепленных со- ответственно к подвижному и неподвижному магнитам, при этом на обеих част х магнитопроводов выполнены кольцевые выточки, в которых распо10 ложены магниты, причем в зазорах между плоскими поверхност ми магнитов и выточек установлены катушки подмагничивани .The goal is achieved by the fact that a magnetic conductor is additionally introduced into the electrodynamic exciter, which consists of internal and external frequencies attached respectively to the mobile and stationary magnets, while on both parts of the magnetic cores there are annular grooves in which there are magnets. Gaps between the flat surfaces of the magnets and the recesses are fitted with bias coils.

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На чертеже показан предлагаемый силовозбудитель.The drawing shows the proposed energizer.

Он содержит внутренний цилиндрический посто нный магнит 1, наружjf ный цилиндрический посто нный магнит 2, основную силовую катушку 3, намотанную на внутренний магнит 1, внутреннюю часть магнитопровода, образованного соединением двух цилиндров 4 и 5 с кольцевой выточкой наIt contains an internal cylindrical permanent magnet 1, an external cylindrical permanent magnet 2, the main power coil 3, wound on an internal magnet 1, the inner part of the magnetic circuit formed by connecting two cylinders 4 and 5 with an annular groove on

Claims

2 the outer surface of the outer part of the magnetic circuit formed by the connection of two cylinders 6 and 7, with an annular recess on the inner surface of the suspensions 8 connecting the movable and fixed parts of the exciter. The external part of the magnetic core is fixed on the fixed base 9. Magnetic coils 10 are placed in the air gap in the gaps between the flat surfaces of the magnets and notches 2. Additional power can be placed in the air gaps of the magnetic core 11 and 12 to increase the magnitude of the induction. coils 13 and 14, wound directly on the inner part of the magnetic circuit. The device works in the following way. An alternating current is supplied to the power coil 3 and the coils 13, 14 connected to it. As a result of the interaction of a constant magnetic field created by a permanent magnet, with an alternating current in the power coil, a pushing force acts on the latter. Under the action of the pushing force, the movable system begins to move along its axis relative to the neutral position determined by the suspension. If it is necessary to maintain linearity between the current through the power coil and its movement, the height of the power coil should be equal to L L. ± 2k, where L. is the height of the air gap; g1 is the maximum possible amount of displacement of the mobile system, determined by the amplitude of the oscillation of the mobile system. . . In accordance with Ohm’s law for a closed magnetic circuit, the magnitude of the magnetic flux is equal to where is the magnetomotive force, the source of which is permanent magnets; R is the total magnetic resistance of the circuit. For an electrodynamic force carrier, R vn f j f R is the magnetic resistance in a stuffy gap; RP is the magnetic resistance of the medium through which the magnetic flux closes. In the proposed electrodynamic energizer, the magnetic flux is closed through the magnetic core of a magnetically soft material that has a much lower magnetic resistance than air. Thus, in the proposed energizer, the magnitude of the impedance R is reduced, and, consequently, the magnitude of the magnetic flux is increased. The magnitude of the magnetic induction in the air gap FJ T where S is the area of the gap. From this formula it is clear that since in the proposed device the value of F is greater, then the value of magnetic induction in the air gap is also higher. Consequently, in accordance with the Ampere formula F V 61, with one other wire length of the power coil t and equal to the value of the current through the power coil Y, the proposed electrodynamic exciter has a larger value of the pushing force F compared to the known energetic exciter. Claims of the invention Electrodynamic energizer according to ed. St. No. 882644, characterized in that, in order to increase the pushing force by increasing the magnetic induction in the air gap, a magnetic conductor is additionally inserted in it consisting of the inner and outer parts attached respectively to the movable and stationary magnets, while The magnetic cores are provided with annular recesses in which magnets are located, with bias coils installed in the gaps between the flat surfaces of the magnets and the recesses. Sources of information taken in. attention during examination 1. USSR Author's Certificate No. 882644, cl. B 06 B 1/04, 1980.