The present invention relates to an electromagnetic system and, more particularly, to a rotary electromagnetic system.
An electromagnetic system is an excitation mechanism, and generally includes an iron core, an armature, a magnetic yoke, and a coil. After being energized, the coil generates magnetic flux that passes through a magnetic circuit formed by the iron core, the armature, and the magnetic yoke. The air gap in the magnetic circuit generates a force, thereby converting electrical energy into mechanical energy.
Common electromagnetic systems may be classified into direct-acting electromagnetic systems and rotary electromagnetic systems. The direct-acting electromagnetic system has been widely used in contactors and relays due to its simple structure and reliable performance.
However, in some cases, the rotary electromagnetic system is required since it may eliminate unnecessary mechanisms such as motors, cams, cranks, connecting rods and the like. At present, the common rotary electromagnetic systems include ball-rotation rotary electromagnetic systems and inclined-rotation rotary electromagnetic systems. However, the two types of rotary electromagnetic systems each have their advantages and disadvantages; the ball-rotation rotary electromagnetic system may generate large torque but have unstable motion, while the inclined-rotation is relatively stable but generates smaller torque.
An electromagnetic system includes a magnetic yoke, a coil mounted in the magnetic yoke, a lower iron core disposed in a lower portion of the coil, a top plate disposed above the coil, an upper iron core having a lower portion disposed in the coil and an upper portion extending through the top plate, an armature disposed above the top plate and fixedly connected to the upper iron core, a magnetic isolation ring disposed between the upper iron core and the top plate, and a plurality of balls each rolling in one of a plurality of first curved grooves of the armature and one of a plurality of second curved grooves of the top plate. The upper iron core moves in a vertical direction. A force applied on the armature by the ball is inclined to a central axis of the upper iron core to drive the armature to rotate.
The invention will now be described by way of example with reference to the accompanying Figures, of which:
Exemplary embodiments of the present disclosure will be described hereinafter in detail with reference to the attached drawings, wherein like reference numerals refer to like elements. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will convey the concept of the disclosure to those skilled in the art.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
An electromagnetic system according to an embodiment, as shown in
The upper iron core 320, as shown in
A plurality of first curved grooves 510, as shown in
As shown in
The armature 500 is movable between an initial position, shown in
When the armature 500 is moved to the initial position shown in
As shown in
As shown in
When the armature 500 is moved to the final position, as shown in
As shown in
The upper iron core 320, the second air gap g2, the lower iron core 310, the magnetic yoke 100, the top plate 400, the first air gap g1, and the armature 500 form the main magnetic circuit of the electromagnetic system.
The coil 200, as shown in
When the coil 200 is energized, while the armature 500 is moved from the initial position to the final position, the armature 500 drives the balls 700 to roll to the second ends 510b, 410b of the first curved groove 510 and the second curved groove 410 due to friction. When the armature 500 is moved to the final position, the coil 200 is de-energized so that the armature 500 may be moved from the final position to the initial position by a return spring.
When the coil 200 is de-energized, the residual magnetic flux rapidly decreases due to the presence of the second air gap g2, and the armature 500 will be quickly returned to the initial position by the return spring. At the same time, due to friction, the armature 500 drives the balls 700 to roll to the first ends 510a and 410a of the first curved groove 510 and the second curved groove 410.
As shown in
It should be appreciated for those skilled in this art that the above embodiments are intended to be illustrative, and not restrictive. For example, many modifications may be made to the above embodiments by those skilled in this art, and various features described in different embodiments may be freely combined with each other without conflicting in configuration or principle.
Although several exemplary embodiments have been shown and described, it would be appreciated by those skilled in the art that various changes or modifications may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.
Number | Date | Country | Kind |
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201710478049.1 | Jun 2017 | CN | national |
This application is a continuation of PCT International Application No. PCT/EP2018/065774, filed on Jun. 14, 2018, which claims priority under 35 U.S.C. § 119 to Chinese Patent Application No. 201710478049.1, filed on Jun. 21, 2017.
Number | Name | Date | Kind |
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2566571 | Leland | Sep 1951 | A |
2966064 | Courtney | Dec 1960 | A |
3264530 | Leland | Aug 1966 | A |
3308410 | Biser | Mar 1967 | A |
3743987 | Yost | Jul 1973 | A |
4157521 | Leland | Jun 1979 | A |
4470030 | Myers | Sep 1984 | A |
4660010 | Burton | Apr 1987 | A |
20210027963 | Zhang | Jan 2021 | A1 |
Number | Date | Country |
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61-208204 | Sep 1986 | JP |
Entry |
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PCT Notification, The International Search Report and the Written Opinion of the International Searching Authority dated Oct. 18, 2018, 15 pages. |
Abstract of JP 61-208204, dated Sep. 16, 1986, 1 page. |
Number | Date | Country | |
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20200126746 A1 | Apr 2020 | US |
Number | Date | Country | |
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Parent | PCT/EP2018/065774 | Jun 2018 | US |
Child | 16720206 | US |