Angle Detector
AssigneeTamagawa Seiki Kabushiki Kaisha
InventorsYoshimi Kikuchi, Kanji Kitazawa, Hisashi Mimura, Masahito Okada, Yonezo Kubota
Life of this patent
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Abstract
It is an object of the present invention to obtain an ultrathin angle detector by disposing an annular rotor board face to face with stator windings of a plurality of stators provided on an annular stator board. An angle detector according to the present invention is constructed by providing magnetic cores and the stator windings on the respective stators provided on a surface of the annular stator board via slots, and disposing a corrugated curved surface formed on a board inner surface of the annular rotor board face to face with the stators so as to obtain an angular signal that changes according to a sinusoidal waveform.
Claims6
An angle detector, comprising:
- an annular stator board (1) made of a non-magnetic material;
- a plurality of stators (5) provided on the annular stator board (1) independently of one another and forming slots (10) at constant or various intervals;
- a magnetic core (11) formed protrusively on each of surfaces of the stators (5);
- stator windings (4) formed around the magnetic cores (11) and composed of excitation windings (4a) and output windings (4b);
- a magnetic flux return path plateau (12) provided protrusively on each of the surfaces of the stators (5) and provided inward or outward of the stator windings (4);
- an annular rotor board (6) provided rotatably on the magnetic flux return path plateaus (12) and facing and remaining out of contact with the stator windings (4);
- and
- a gap forming board (13) provided on an inner surface (6a) of the annular rotor board (6) and having a board inner surface (13a) whose protrusion state changes according to a waveform,
- wherein the annular rotor board (6) rotates to cause changes in a gap (14) between each of the magnetic cores (11) and the board inner surface (13a) of the gap forming board (13).
Dependencies are inferred from the claim text.