Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1988-09-26
1991-04-30
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
333106, 333108, 335254, H01F 708
Patent
active
050122924
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for setting the rotor of a rotary switch into three possible positions.
Such devices are required, for example, to set a waveguide switch or a coaxial switch.
Such a device is known (EP-A3 0147610and corresponding to U.S. Pat. No. 4,633,201). In this prior art device, the rotor of a waveguide switch is rotated by means of a stepping motor to the vicinity of the desired rotor position and is then definitively moved into the desired rotor position by means of magnetic forces.
Waveguide switches driven by stepping motors have a relatively high weight and large exterior dimensions and require, for three possible positions, two conductor pairs for actuation in addition to an additional control circuit.
SUMMARY OF THE INVENTION
The invention is concerned with effecting the setting into the three positions--seen in one direction of rotation--by way of a single pair of conductors, with low weight and small external dimensions, and to bring the switch rotor exactly into the three desired positions and hold it there without mechanical detent means, which is fraught with problems particularly in the center position but is accomplished by the solution according to the invention.
The device according to the invention is provided with two drive systems for one direction of rotation, both systems being actuated by way of one conductor pair. One drive system rotates the rotor from the one end position into an auxiliary position which is disposed in the vicinity of the one end position. Magnetic detent means move the rotor from the auxiliary position into the center position and center it there.
For switching into the other end position, the other drive system must be actuated by means of the same conductor pair. After switching off the drive system, the rotor is held in the other end position by magnetic detent means.
If, according to a feature of the invention stops are provided in the end positions, the rotor in the end position can be pressed against the stop by the magnetic detent means or can be centered there if, according to still a further feature magnetic centering is provided and stops are connected subsequent to the magnets.
If the rotor is to be moved from this end position into the opposite end position, the other drive systems must be actuated by wa of the other conductor pair: the operation is the same.
The invention will be described below in greater detail in connection with a description of the drawing figures.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an embodiment of a waveguide switch in basic outlines at its three positions.
FIG. 2 shows actuation of the waveguide switch by way of the two conductor pairs I and II;
FIG. 3 shows the drive systems for the two directions of rotation.
FIG. 4 shows the moment curve of the device plotted over a development of the rotation angle .alpha. with stops provided in positions 1 and 2.
FIG. 5 shows the moment curve of the device plotted over a development of the rotation angle .alpha. with stops connected subsequent to positions 1 and 2.
FIG. 6 is a partially developed view of the device in basic outlines.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 of the drawing is an illustration of the principle of a waveguide switch embodiment in its three positions, Pos. 1, Pos. 2 and Pos. 3. In position Pos. 1, input A is connected with B and input C with D, in position Pos. 2, input B is connected with input C and input A with D and in switch position Pos. 3, input A is connected with input C and input B with D.
According to FIG. 2, the waveguide switch 7 is actuated to rotate it in one direction by way of a conductor pair I and in the other direction by way of a conductor pair II, with separate windings being provided for the two directions of rotation. As shown in FIG. 3, the drive systems for the two directions each have two drive windings I.sub.1 and I.sub.2 as well as II.sub.1 and II.sub.2, respectively.
According to FIG. 4, which shows the detent moments and the driving moments (M)
REFERENCES:
patent: 3141943 (1964-07-01), Lanctot
patent: 3344378 (1967-09-01), Wilhelmson
patent: 4317972 (1982-03-01), Kiellberg
patent: 4447793 (1984-05-01), Gray
patent: 4628199 (1986-12-01), Mueller et al.
patent: 4633201 (1986-12-01), Ruff
PCT, WO87/00349, 1-15-87.
Universitatsbibliothek Hannover und Technische Informationsbibliothek, IBM Technical Disclosure.
Harris George
Teldix GmbH
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