Rotation angle detection device and electric motor with rotation angle detection device equipped with same

Abstract

The purpose of the present invention is to provide a rotation angle detection device as well as an electric motor with the rotation angle detection device, which not only allows the device as a wholeto be made thinner but also allows the external diameter of the device as a whole, centered on a rotating shaft, to be made smaller, thereby achieving easy attachment of the device to a compact electric motor or the like. A first seat coil 21, to which an excitation winding has been attached, is provided on a base 7 that is anchored to a fixed body; a second seat coil 24, to which a detection winding has been attached, is provided on a base-facing surface of a rotating plate 8 that is anchored to a rotating shaft 5; a third seat coil 27, to which a primary winding of an output transformer 25 has been attached, is provided on a cover-facing surface of the rotating plate 8, the primary winding being connected to the detection winding via a connection means 37 that passes through the rotatingplate 8 interposed therebetween; and a fourth seat coil 29, to which a secondary winding of the output transformer 25 has been attached, is provided on a rotating-plate-facing surface of a cover 9.

Description

technical field [0001] The present invention relates to a rotation angle detection device and an electric motor provided with the rotation angle detection device. Background technique [0002] A conventional rotation angle detection device includes a stator having an annular stator core and a rotor made of a magnetic material and disposed in the stator, wherein the stator is provided with a plurality of salient poles directed from the annular stator core in a centripetal direction, and Wherein, each of the salient poles is wound with a coil (see Patent Document 1 or 2). [0003] However, such a conventional rotation angle detection device has a large device thickness in the axial direction of the rotor because a coil is wound on each of the salient poles perpendicular to the axial direction of the rotor. [0004] In order to reduce the thickness of the entire rotation angle detection device, another conventional rotation angle detection device has a structure in which a chi...

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Problems solved by technology

[0005] However, a device using such a chip coil has a problem that the outer diameter of the entire rotation angle detection device centered on the rotation axis is large because the primary coil and the secondary coil constituting the output transformer are respectively arranged in On the outer peripheral surface of the rotor and the inner peripheral surface of the base portion of the stator, and the excitation coil and the detection coil are also arranged at the outside of the output transformer so as to face each other

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