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Rotary actuating drive and rotary switch
| Details |
Inventors: Hettlage, Eckart;
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Examiner: Le; Dang
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
To simplify the design of a rotary actuator, in particular for an "R"-type waveguide switch, having a permanently magnetized rotor and a plurality of stator windings surrounding the rotor in a rim-like fashion, for generating magnetic fields which place the rotor in one of a first plurality of positions, it is proposed to finish the actuator with elements for exerting a corrective torque on the rotor, the elements placing the rotor, in the currentless state of the stator windings, in a target position of a second plurality of positions, each position of the first plurality having assigned to it a target position. |
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DETAILED DESCRIPTION According to the present invention, in a rotary actuator of the type cited above, elements are provided for exerting a corrective torque on the rotor, the elements, in the currentless state of the stator windings, placing the rotor in a target position from a second plurality of positions, a target position being assigned to each position of the first plurality.
Therefore, whereas in conventional rotary actuators the stator windings themselves must place the rotor in a target position, in the actuator according to the present invention, this task is taken on by the elements for exerting a corrective torque.
Therefore, there no longer exists the requirement that the stator windings must have an arrangement having double symmetry in order to be able to set n different positions in an angular range of 180.
degree.
.
Their arrangement can therefore be simpler, a high degree of symmetry in any case in the elements for exerting the corrective torque.
But since the latter is smaller than the torque to be exerted by the stator windings and since the range of the latter can be significantly smaller, it is possible that the elements for exerting the corrective torque can also be significantly smaller and more compact.
In particular, these elements can be permanent magnets and therefore do not need to be wired.
Thus according to the present invention, it is possible to arrange the stator windings about the rotor in an unpaired fashion, which cuts in half the number of contacts that are needed for the power supply of the stator windings, and that must be soldered or connected in some other way.
The possibility of using a number of stator windings that is smaller than the number of the first positions makes possible a further simplification of the design.
According to one preferred embodiment, the rotary actuator has four first positions and three stator windings.
Further features of the rotary actuator according to the present invention and of a rotary switch that is equipped with an actuator of this type can be derived from the description of the exemplary embodiments below
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Generators or Motors 
