CN2061870U

CN2061870U - Electric-magnetic attracting reciprocating vibrator

Info

Publication number: CN2061870U
Application number: CN 90202773
Authority: CN
Inventors: 陈洪严
Original assignee: Wang Jiwang Li Shuyan Niu Hong
Current assignee: Wang Jiwang Li Shuyan Niu Hong
Priority date: 1990-03-15
Filing date: 1990-03-15
Publication date: 1990-09-12

Abstract

The utility model relates to an electromagnetic attracting reciprocating vibrator. Two independent coils which are sheathed outside an iron core are respectively concatenated with a diode, and then are connected with an alternating current power supply. A magnetic field which is generated by the two coils which are energized alternately is formed into two closed magnetic loops by the iron core and outer magnetic loops, and neither the coils nor the outer magnetic loops are contacted with the iron core. The iron core and the magnetic loops are relatively reciprocated. Compared with existing electromagnetic vibrators, the utility model has the advantages of great thrust, small volume and low energy consumption.

Description

The electromagnetic attraction formula moves back and forth vibrator

It is to produce reciprocating a kind of electromechanical assembly that the electromagnetic attraction formula moves back and forth vibrator, and being applied to needs vibrative occasion, for example can use as exciting source in various vibration tests.

Existing electromagnetic exciter, iron core connects together with outer magnetic loop, places moving coil in the magnetic field that magnet exciting coil energising (or by permanent magnet) produces.Owing to the interaction force in electric current and magnetic field makes the moving coil reciprocating, exciting force is passed to the object that needs vibration by moving coil support.

As everyone knows, in uniform magnetic field, the interaction force in electric current and magnetic field is: F=BiL, and wherein, B is a magnetic induction intensity, and i is the current strength of electrified wire, and L is the effective length of lead in magnetic field.

For increasing directed force F, people generally use good magnetic material with the increase magnetic induction density B as far as possible, but the increase of B is limited.Therefore, after selected magnetic material, just can only increase directed force F by the effective length L that increases current i and lead.And increase diameter and the total length that i and L just must increase the moving-coil lead, thereupon the shared space increase of moving-coil and the air-gap thickness on the magnetic circuit is increased exponentially.Yet when in energized circuit air-gap being arranged, because the magnetic resistance of air-gap is very big, most of magnetomotive force has all consumed on air-gap.For keeping magnetic induction density B not reduce, will increase magnetomotive force.In general,, air-gap is twice, just the magnetomotive force that almost will double when increasing.Concerning the vibrator that requires high thrust, moving-coil required air crack reaches tens millimeters, and required exciting power is just considerable.

According to above analysis, the major defect of existing electromagnetic exciter is that thrust is little, volume big, power consumption is high as can be seen.

The purpose of this utility model is to utilize electromagnetic attraction to make the energy-efficient electromagnetic exciter that a kind of thrust is big, volume is little, is used for the occasion than low frequency (hundreds of hertz following), high thrust.

Accompanying drawing is a structural representation of the present utility model.The outside of the iron core of making at soft magnetic materials (1) is with two independently coil (3), (4), they respectively with diode (5) with connect AC power after connect (6).Coil (3) and (4) be magnet exciting coil be again drive coil, another ends when diode (5) and (6) conductings, and coil (3) forms two closed magnetic loops with the outer magnetic loop (2) that the magnetic field that (4) alternate energisation produces is made by iron core (1) and soft magnetic materials.The length L of iron core (1) ₁Length L less than outer magnetic loop (2) ₂Coil (3), (4) and outer magnetic loop (2) all do not contact with iron core (1), one small air-gap d is only arranged between outer magnetic loop (2) and the iron core (1), under the electromagnetic attraction effect, iron core (1) can do relatively reciprocating motion with outer magnetic loop (2).

The course of work of the present utility model is: when drive current is forward, diode (5) conducting, coil (3) energising, diode (6) ends, coil (4) no power, when magnetic loop (2) is motionless outside deciding, because the electromagnetic attraction effect makes iron core (1) to A direction motion (establishing this direction is positive direction), if exterior object stops the motion of iron core (1) just to be subjected to the thrust of A direction; When drive current is negative sense, diode (6) conducting, coil (4) energising, diode (5) ends, coil (3) no power, electromagnetic attraction makes iron core (1) to motion in the other direction, if exterior object stops its motion will be subjected to the thrust opposite with the A direction.So move in circles, iron core (1) just constantly applies exciting force to exterior object.

The utility model and existing electromagnetic exciter compare, because the excitation principle difference, its advantage and good effect are tangible.By above-mentioned analysis to existing vibrator, the air-gap of common electrical magnet exciter magnetic loop is several millimeters to tens millimeters, the utility model can make air-gap d less than 1 millimeter, thereby under the long-pending situation of same core section, drive current of the present utility model will only be the part even 1/tens of the exciting current of common electrical magnet exciter; The utility model has been cancelled moving-coil, and exciting current (coil) is drive current (coil), thereby has saved field power supply; The moving-coil of common electrical magnet exciter is because spatial constraints, the number of turn less (many air-gap just increase), drive current is bigger, the utility model drive coil space of living in is well-to-do, can increase the number of turn, reduce drive current, so the power demand amplifier is also just made easily manyly.So the utility model can be realized the requirement that thrust is big, volume is little, power consumption is low.

The utility model also is different from electromagnet.For alternating electromagnet, the frequency of its active force is the twice of supply frequency, and its air-gap thickness changes because of the iron core motion.The change of air-gap thickness makes the non-linear rapid variation of electromagnetic force, therefore can not use as regular exciting source.

Claims

1, the electromagnetic attraction formula moves back and forth vibrator, the iron core and the outer magnetic loop that have soft magnetic materials to make, the outside that it is characterized in that iron core (1) is with two independently coil (3) and (4), coil (3), (4) respectively with diode (5), (6) connect AC power after the series connection, diode (5), another ends during (6) conductings, coil (3), (4) be magnet exciting coil be again drive coil, the magnetic field that their alternate energisations produce forms two closed magnetic loops by iron core (1) and outer magnetic loop (2), the length L of iron core (1) ₁Length L less than outer magnetic loop ₂Coil (3), (4) and outer magnetic loop (2) all do not contact with iron core (1), one small air-gap d is only arranged between outer magnetic loop (2) and the iron core (1), under the electromagnetic attraction effect, iron core (1) does relatively reciprocating motion with outer magnetic loop (2).