DE2455355C3 - Electromagnetic torsion spring of variable stiffness - Google Patents

Description

The invention relates to an electromagnetic torsion spring with variable rigidity, in which the deflection resistance is generated in that a current-carrying conductor is provided with a Permanent magnets cooperate.

These electromagnetic torsion springs of variable stiffness are preferably used for measurement purposes used, in which moment or force equilibrium states are generated for the formation of a measured value will.

It is already known to build electromagnetic torsion springs in that they are in a stator with four symmetrically arranged electromagnetic poles one made of magnetic material Rotor is located, which has a Mullposition to the said poles and, starting from the zero position, a Can produce angular rotation in either direction if the electromagnetic poles are appropriately get excited.

Another measuring system with a pot-like body, on whose cylindrical surface a conductor isolated and rotatably arranged between the air gap of magnetic pole pairs, one can see from the See US-PS 31 52 275.

The measuring system according to US-PS 31 52 275 is a torque generator in which the Pot-like body is deflected from the neutral position when current is passed through the conductor. At the subject according to US-PS 33 53 414 and US-PS 31 52 275, however, due to inertia and residual magnetism, no required measurement accuracy with regard to dynamic behavior and zero point stability achieved will.

In addition, both known measuring systems are complex, expensive and require a relatively high amount of construction a lot of space, which z. B. for aviation equipment is disadvantageous.

The invention is therefore based on the object of providing an electromagnetic torsion spring in a very small space to make variable stiffness such that it has no zero point instability and in operation in their Movement is muted.

This object is achieved e.r invention in that the current-carrying conductor in or on a movable disc made of electrically conductive, non-magnetizable material is provided, which is in an air gap between two oppositely opposing permanent magnet rings, wherein each Perrrcanentmagnetring has at least one pole field pair, and the conductor in the zero position Torsion spring runs radially in the neutral zone between the pole fields.

Furthermore, each permanent magnet ring can have one

»Have 5 large number of pole field pairs and the one through which current flows Head seen in the circumferential direction of the disc, run in a wave shape, with the individual Half-wave distances equal to the distance between an adjacent pair of pole fields on the permanent magnet ring are. In this way, increased damping can be achieved.

The advantages that can be achieved with the invention result from the solution to the problem posed. In addition, the inventive design of the torsion spring in question allows a space-saving structure of the same, which z. B. for devices in the aviation industry can mean a significant technical advance.
An embodiment of the invention is explained with reference to the drawings. This shows in

Fig. 1 a cross section through the electromagnetic Torsion spring,

Fig. 2 the arrangement of the winding in the rotatable disc,

Fig. 3 the ring magnet with the magnetic return disc.

Fig. 1 shows the ring magnets 1 and 2 with the magnetic yoke 3 and 4. The parts 1, 2 and 3, 4 are built into the housing 5 so that a Air gap 6 arises in which the existing of electrically conductive, non-magnetizable material rotatable disc 8 is located with the current-carrying conductor 7 and concentric to the shaft 9 the ring magnets 1 and 2 is mounted.

A b b. 2 shows the disc 8 with the wave-shaped conductor 7, which is in the form of a dovetail Grooves can be embedded in the disk 8 in an isolated manner.

A b b. 3 shows the ring magnet 2 with the magnetic yoke 3 and the neutral zone 10.

1 sheet of drawings

Claims (2)

Patent claims: 1. Electromagnetic torsion spring of variable stiffness, in which the deflection resistance is thereby is generated that a current-carrying conductor is provided with a permanent magnet cooperates, characterized that the current-carrying conductor (7) in or on a rotatable disc (8) from electrically conductive, non-magnetizable material is provided, which is in an air gap (6) between two Opposite opposite permanent magnet rings (1, 2) are located, each Perma.ientmagnemng has at least one pole field pair, and the conductor (7) in the zero position of the torsion spring runs radially in the neutral zone (10) between the pole fields. 2. Electromagnetic torsion spring according to claim 1, characterized in that each permanent magnet ring (1, 2) has a plurality of pole field pairs and the current-carrying conductor (7), seen in the circumferential direction of the disc (8), runs in a wave-like manner, the individual half-wave spacings equal to the distance between an adjacent pair of pole fields on the permanent magnet ring are.