Rotor setting arrangement

Details Rotor setting arrangement Rotor setting arrangement

1989-08-02

1991-08-13

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

333106, 333108, 335254, H01F 708

Patent

active

050399683

DESCRIPTION:

BRIEF SUMMARY
This invention relates to an arrangement for setting a rotor into n possible positions.
WO 87/00,349 discloses a moving arrangement for setting the rotor of a high-frequency switch into predetermined switching positions. In this moving arrangement, at least two electrically actuatable coils are arranged on the side of the stator and at least one permanent magnet on the side of the rotor in such a manner that actuation of the coils causes the rotor to be moved at least approximately into the predetermined switching positions. A deceleration element is provided which operates without contact to brake the movement of the rotor in the vicinity of the predetermined switching position.
EP-A3 0,147,610 discloses a waveguide switch having, in particular, four rotor positions. The rotor of this waveguide switch is rotated by means of a stepping motor into the vicinity of a desired switching position. Permanent-magnet forces of a detent member center the rotor in an exact switching position as predetermined by the detent member.
It is the object of the invention to provide an arrangement for setting the rotor of a rotary switch into n possible positions, wherein the actuation of the drive coils is effected through as few conductors as possible and the arrangement nevertheless has a simple, compact structure.
In the arrangement according to the invention, all drive coils are actuated only through the same conductor pair. An auxiliary position is provided between the individual detent positions and, in each case, lies closer to the initial position than to the next following position. The permanent magnets of the detent arrangement on the side of the rotor and stator have an associated, oppositely polarized lower field intensity permanent magnet which is offset by such an angle that, in the auxiliary position, once the drive system has been turned off, a moment driving in the direction of the next following position, rotates the rotor into the next following position and centers it there. The axes of the adjacent drive coils enclose an angle of 360.degree.
or 360.degree./2n.
Further advantages and features become evident from the dependent claims and the specification. The tapering of the detent magnets results in more accurate positioning of the rotor and the additional drive winding realizes, in particular, faster switching of the rotor into the next switching position. The damping device causes the rotor to come to rest in the detent positions without overshooting and pendulum action.
The invention will now be described in greater detail with reference to three embodiments.
It is shown in:
FIG. 1, an elementary diagram, in a developed view, of part of an arrangement for eight switching positions;
FIG. 2, the moment characteristics of the developed view of FIG. 1;
FIG. 3, a further embodiment of the invention including a further drive winding;
FIG. 4, the moment characteristics of the further embodiment of the invention shown in FIG. 3;
FIG. 5, a circuit diagram of the deceleration member required for the further embodiment of the invention including two drive windings W1 and W2;
FIG. 6, voltage characteristics for the deceleration member shown in FIG. 5;
FIG. 7, part of the basic structure, in a developed view, of an integrated damping device that can be used in an arrangement similar to FIG. 1a and in a further embodiment similar to FIG. 3a;
FIG. 8, part of the basic structure, in a developed view, of a modification of the integrated damping device that could be used in an arrangement similar to FIG. 1a and in a further embodiment similar to FIG. 3a.
The arrangement according to FIG. 1 comprises, in FIG. 1a, a drive including a stator 1 and a rotor 2 for eight switching positions as it could be used, for example, to switch coaxial or waveguide switches. The stator 1 composed of a plastic body includes a drive winding of 2n series and/or parallel connected drive coils 5, here symbolically indicated as single conductors shown in section in a developed view. The winding arrangement is offset by about 5.5.degree. fr

REFERENCES:
patent: 4500861 (1985-02-01), Nelson
patent: 4633201 (1986-12-01), Ruff
patent: 4647889 (1987-03-01), Addis

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