DE8900779U1 - Impulse lifting magnet - Google Patents

Description

B. Walloschice

Page 3

Description

A pulse lifting magnet is a system that can hold two armature positions alternately for as long as desired without a constant energy supply using two energy storage devices. The stabilization of armature position 1 (stroke start position, see VDE 0580) is achieved by a spring with the desired preload, e.g. used in the armature bed, as energy storage device 1.

The stabilization of the armature position 2 (end position of stroke, see VSE 0580) is achieved by the holding force of the permanent magnet, which can be seen as energy storage 2.

Electrical energy is only required in short, appropriately polarized current pulses on the excitation winding for the switching process from armature position 1 to 2 or vice versa. This is a significant advantage of the impulse lifting magnet compared to an electric lifting magnet, which in armature position 2 requires electrical energy for as long as it is to hold this position. The task was to create an impulse lifting magnet with optimal efficiency with little effort, even by simply converting a conventional electric lifting magnet. The area of application is very wide-ranging. The preferred aim here is to operate valves, where an excitation system (magnet body) and a magnetic sleeve with pole shoe that accommodates and guides the armature are assumed. Such a functional lifting magnet system is shown in Fig. 2. The invention solves the structural and practical conversion to a pulse lifting magnet according to Fig. 1 as follows: the pole shoe (14) and thus also the magnetic sleeve is shortened in a simple lathe operation by exactly the amount that the bush-shaped permanent magnet (16) to be inserted provides, since the part is easy to clamp. The form-fitting arrangement of the parts ensures optimal magnetic flux transfer.

The fragility of such permanent magnets (16) is minimized by the fact that a non-magnetic screw with screw stop on the pole shoe (14) and its screw head creates a precisely reproducible space, the permanent magnet (16) accommodates the iron circle (11) and the spring element (18), which

&idiagr;| hard metallic pressure of the screw (17) on the Perm.-

I Magnets (16) safely prevented.

I The invention achieves optimum efficiency through the

i Placement of the Perm. magnet (16), which is justified as follows

i> is: any preferred round, cylindrical excitation winding

has a central bore-shaped interior when energized

;■;, the largest magnetic field line density, which the invention

U dung exactly fulfills and uses.

Reference number: Fig. Fig.2 10 10 11 11 12 12 13 13 14 14 16 17 17 18

Pulse lifting magnet Fig. 1 Electric lifting magnet Fig. 1

Excitation winding

outer iron circle

Protective housing (e.g. plastic casing)

Magnetic closure sleeve

Pole shoe

anchor

Permanent magnet

Screw (non-magnetic only Fig. 1)

Spring element (O-ring) 19 Spring

20 coil bodies

Claims (7)

• · • · · 1 R. Wallosohke Bl. 1 Sohutzansprüohe 1. Impulse lifting magnet naoh Fig. 1 consisting of a magnetic body which is constructed as follows« Excitation winding (10) on coil body (20), this is enclosed by the outer iron circuit (11) with or without protective housing (12), e.g. plastic sheath. Pole shoe (14·) integrated in a non-magnetic magnet sleeve (13). Magnetic armature (15) with bore for armature return spring (19); characterized in that a bush-shaped, axially magnetized permanent magnet (16) is mounted and fixed as an additional loose component between the pole shoe ( ¹² ) and the iron circuit (11) without an air gap. 2. Pulse lifting magnet according to claim 1, characterized in that the outer iron circle (11) of the magnet body has holes of different sizes for receiving the magnetic closure sleeve (13) with integrated pole shoe (14). This results in a mechanical stop for the permanent magnet (16) and for the inserted magnetic closure sleeve (13) with pole shoe (14) on the smaller hole side of the iron circle (11). 3. Pulse lifting magnet according to claim 1 and 2, characterized in that in the described form-fitting arrangement of the pressure-sensitive permanent magnet (16) between the metallic components pole shoe (14) and iron circuit (11) via a resilient element (18) (e.g. O-ring) and a subsequently described, non-magnetizable screw (17), the permanent magnet (16) is only exposed to the definable expansion pressure emanating from the element (18) when the screw (17) is screwed in as far as it will go. 4. Pulse lifting magnet according to claim 1, 2 and 3, characterized in that the screw (17) is screwed into the pole shoe (14) with the full thread length until the front surface transition to the thicker, smooth screw shaft rests firmly against the front surface of the pole shoe (14) and the spring element (18) between the screw head and the iron circle (11) has the desired clamping force for gap-free alignment of the »t mi Page 2 Parts 14,16 and 11. 5. As lifting magnet according to claim 1 to 4, characterized in that by omitting the permanent magnet (16) the free space created is filled again by ferritic material of the same shape or by a correspondingly longer pole shoe (14). 6. Pulse lifting magnet according to claims 1 to 5, characterized in that the axially magnetized permanent magnet (16) is immersed in the centric, central, usually round cavity of the excitation winding almost over its entire length. 7. Pulse lifting magnet according to claim 1 to 6, characterized in that the spring element (18) is preferably designed as an O-inlet.