JPS5846861A - Electromagnetic drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Known Art The present invention comprises two soft iron cores arranged coaxially and facing each other at a distance from each other, and each of the soft iron cores is wound with at least one winding. It further includes a soft iron magnet that reciprocates between both cores, a magnetic flux return member that connects the inner cores, and an annular guide that surrounds the soft iron magnet and is magnetically conductively coupled to the magnetic flux return member. , relates to electromagnetic drives, for example for valves, supply pumps, etc. Drives of this type are already known f
Yes, in which case the guide ring is made of soft iron. There is also a certain relationship between the achievable force and the structural size of the drive, so that the required force determines the space required for the drive.

Effects of the Invention In contrast, the drive device having the structure described in claim 1 of the present invention can have the same size and higher performance than the conventional drive device, or can have the same performance. It has the advantage of being able to have a compact structure. This advantage is obtained, for example, by making the windings as small as possible.

Another advantage is that the movable cylinder has a certain coercive force with high magnetic permeability. By using a magnetic material, it is possible to hold this cylindrical body in the final position without applying an electric current.
There are several points that can be mentioned.

Next, embodiments of the present invention will be described in detail using the drawings.

The illustrated valve drive device has two cores 10.12 made of a highly permeable ferromagnetic material, the magnetic pole faces 14.16 of the cores facing each other at a distance. A hollow cylindrical body 17 consisting of a tubular body 18 and a covering plate 19' left covering the tube opening is provided between the two magnetic pole faces 14,16. Like the core, the hollow cylindrical body 17 is also made of a ferromagnetic soft material. Each core 1
0 to 12 are surrounded by rings 20 to 22, the sides of which opposite the magnetic collar surface 14.16 are advantageously integrally connected to the respective associated cores IO to 12 via bottoms 24 to 26. ing. Each ring 20 to 22 projects beyond its associated core 10 to 12 by a height corresponding to half the distance between mutually opposing pole faces 14 to 16 of the cores. The faces 28 to 30 of both rings replenish each other when the drive is assembled, so that the pole faces 1
The desired spacing occurs between 4 and 16. Further, as shown, rings 20 to 22 and associated cores 10 to 1
2, an annular groove is formed in which the windings 32 to 34 are provided. The height of the cylindrical body 17 is equal to both magnetic pole faces 14
．． 16. Covering plate 1 of cylindrical body 17
9, a valve body 36 is provided which cooperates with a valve seat 38 surrounding the inflow channel 40.
A number of outflow channels 44 and inflow channels 40 communicate with the space 42 between the pole faces 14,16.

The cylinder 17 is surrounded by a guide ring 46 made of a radially magnetized ferromagnetic material, which is held at its outer edge in the scrap-like cutouts 48.50 of the two rings 20.22. There is. If the N pole is located inside the guide ring, the movable iron cylinder 17 is
The whole becomes a north pole, and the magnetic pole faces 14 and 16 of the pot-shaped magnet are
Ring 20 indirectly becomes an S pole via rings 20 to 22 and bottoms 24 to 26. In other words, the return path of magnetic flux is the ring 20.
．． 22 and bottom 24.・26.

When the cylindrical body 17 is in the intermediate position, the attraction forces on both end faces of the cylindrical body are equal to XO, that is, the cylindrical body 17 is in an unstable equilibrium state 1
m, A1), when the suction force is biased, it is pulled to one side, narrowing the gap on that Q) side. The cylinder is then held in the end position by strong l,z forces.

The windings 32 and 34 are connected so that when a voltage is applied, opposite polarity occurs in the potted core. Force 1 weakens 0 The cylinder 17 can therefore be controlled from one end position to the other, in which case the valve 36.38 can be opened or closed. , the windings 32.34 generate a magnetic flux 58 that opens or holds the valves 36, 38 open.If the connection of the windings 32.34 is switched, the magnetic flux 58 is reversed and the valves 36.38 are opened. Close. The magnetic flux generated by the radially magnetized guide ring 46- enters the cylinder 17 and branches into two partial fluxes 54, m6 (FIG. 2). When it is in the middle position, it has the same thickness t, but when it is shifted from the middle position, there is a slight difference. Cylindrical body 17
When is at an intermediate value, magnetic flux φ is generated from both end faces of the cylinder and flows into the pot-shaped core lO or the magnetic pole faces 14 and 16 of 12. (
54, 56), the magnetic flux φ generated by the winding 32.34
8 (58) are superimposed in the same direction in one air gap, and in the opposite direction in the other air gap (FIG. 2). The attractive force acting on the end face of the soft magnetic cylinder 17 due to the magnetic flux in the air gap is: where A is the cross-sectional area of the cylinder 17, μ. means the magnetic permeability of vacuum, and by subtracting these equations, the total attractive force F can be found.

F = F, -F2~φp, φ8 This total attractive force is proportional to the exciting current and is limited by the saturation of the magnetic circuit. However, this total attractive force is significantly higher than the force that would have been acting on the movable permanent magnet cylinder if the current had been predetermined.

When using the drive position of the present invention as a pump, the cylindrical body 1
A check valve is provided in a channel passing through the cylinder in the direction of movement of the cylinder, whereby the continuous reversal control of the cylinder from one end position to the other causes the medium to flow through the channel. I can supply 1. A cylindrical body constructed in this way is known, for example from German Patent Application No. 1900093.

However, the cylindrical body 17 according to the invention can also act as a diaphragm pump. This principle is illustrated in, for example, U.S. Pat.
1 65 762 specification 1.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a drive mounting according to the invention used as a valve, with the valve open, and FIG. 2 is a cross-sectional view of the drive device of FIG. 1, with the magnetic flux indicated by arrows.

Claims (1)

[Claims] 1. It is equipped with two soft iron cores arranged coaxially and facing each other at a distance from each other, each of the soft iron cores is wound with a winding wire, and furthermore, a winding wire is wound between the two cores. A moving soft iron magnet,
In an electromagnetic drive device including a magnetic flux return path member that connects inner cores, and an annular guide portion that surrounds a soft iron magnet and is conductively coupled to the magnetic flux return path member, the guide portion (46) is formed from a hard magnetic material. An electromagnetic drive device characterized by being magnetized in the radial direction. 2. A soft iron magnet is attached to an at least partially hollow cylindrical body (
17) The drive device according to claim 1, formed as: °3. The drive device 04 according to claim 2IfJ1, in which the cylindrical body (17) is composed of a tubular body (18), and the guide ring (46) is closed with a covering plate (19) having both pipe openings of the tubular body. Both magnetic pole faces (1) of both winding cores (lo, 12)
4. The drive device according to claim 1, wherein the drive device is attached to the magnetic flux return path members (, 20, 22) at equal intervals from the magnetic flux return path members (, 20, 22).