JPH0658310U - Rotation angle detector - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a rotation angle detecting device which obtains a high S / N ratio and becomes strong against disturbance such as an external magnetic field. [Structure] The rotor 2 is eccentric, and the stator 20
8 stages of stator plates 4 to 11 each having an eccentric hole and arranged in the axial direction of the rotor 2 are provided, and the excitation windings 13 and 16 and the detection windings 12, 14, 15 and 17 are provided in 8 stages.
The stator plates 4 to 11 in stages are wound in a sandwich shape in the axial direction of the rotor 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotation angle detection device that electromagnetically detects a rotation angle of a rotating body.

[0002]

[Prior art]

 As an example of a conventional rotation angle detecting device of this type, a structure disclosed in Japanese Patent Publication No. 62-58445 is known as shown in FIG. This rotation angle detecting device has exciting magnetic poles 33A, 33B, 33C and 33D in which primary windings 32A, 32B, 32C and 32D for excitation are differentially wound at predetermined angular intervals in the circumferential direction. A plurality of pairs are provided and a reluctance of a magnetic path passing through the exciting magnetic poles 33A to 33D of each stator and a stator 35 provided with a secondary winding 34 for detecting the induced voltage by the exciting magnetic poles 33A to 33D are set as rotation angles. And a rotor 36 having a shape that changes in accordance with the above, and each exciting magnetic pole pair is separately excited by a plurality of AC signals 37 and 38 having a phase shift corresponding to the angular interval. An AC signal having a phase shift corresponding to the rotation angle is output from the secondary winding 34.

[0003]

[Problems to be solved by the device]

 By the way, in the conventional rotation angle detecting device, since the exciting windings 32A to 32D and the detecting winding 34 are wound around the common exciting magnetic poles 33A to 33D of the stator 35, the structure is complicated and self-inking is performed. There is a problem that a high S / N ratio cannot be obtained due to the influence of dactance, and that it becomes weak against external magnetic fields and other disturbances.

The present invention has been made in consideration of the above problems, and an object thereof is to provide a rotation angle detection device that is strong against a disturbance such as an external magnetic field when a high S / N ratio is obtained. It is what

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a stator provided with an exciting magnetic pole having an exciting winding and a detecting winding for taking out an induced voltage by the exciting magnetic pole, and an exciting magnetic pole. In a rotation angle detecting device including a rotor having a shape that changes the reluctance of a magnetic path passing through a pole according to a rotation angle, the rotor is eccentric, and the stator has respective eccentric holes. A multi-stage stator plate disposed on the multi-stage stator plate, and the excitation winding and the detection winding are wound around the multi-stage stator plate in the axial direction of the rotor in a sandwich shape.

Further, the present invention is characterized in that the detection winding comprises a combination of a plurality of windings connected in series so as to have a positive phase and an opposite phase with respect to the excitation winding. It is a thing.

[0007]

[Action]

 According to the configuration of the present invention as set forth in claim 1, the stator is provided with multi-stage stator plates each having an eccentric hole and arranged in the axial direction of the rotor, and these stator plates are provided with the excitation winding and the detection winding. Since it is wound in a sandwich shape in the axial direction of the rotor, the exciting winding and the detecting winding are not the common exciting magnetic pole but separate windings at different positions. Therefore, a high S / N ratio can be obtained with a simple structure.

According to the configuration of the present invention as set forth in claim 2, by combining a plurality of windings connected in series so that the detection winding has a positive phase and an opposite phase with respect to the excitation winding. , It is possible to strengthen against external disturbance such as external magnetic field, and it is possible to perform stable detection.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a half sectional view and a top view showing an embodiment of a rotation angle detecting device of the present invention. 1 is a case made of a magnetic material, 2 is a case which is arranged in the case 1, and is rotated by a rotating shaft 3. It is a rotor that is supported and is eccentric. Reference numeral 20 is a stator provided on the inner circumference of the case 1, and is composed of, for example, eight stages of stator plates 4, 5, 6, 7, 8, 9, 10, 11 arranged in multiple stages in the axial direction of the rotating shaft 3. , Each stator plate has an eccentric hole.

When the eccentric center of each of the stator plates 4 to 11 is the reference (0 °) with respect to the stator plates 4 and 6 as shown in FIG. 3, the stator plates 5 and 7 are at 180 ° as shown in FIG. The plates 8 and 10 are mounted at 270 ° as shown in FIG. 5, and the stator plates 9 and 11 are mounted at 90 ° as shown in FIG. 12, 14, 15, and 17 are detection windings, and 13 and 16 are excitation windings, which are arranged concentrically with respect to the axis of the rotor 2 on each of the stator plates 4 to 11 as shown in FIG. ing.

Further, as shown in FIG. 7, the detection winding 12 is wound in the positive phase and the detection winding 14 is wound in the opposite phase with respect to the excitation winding 13, and further, the excitation winding 16 is wound. On the other hand, the detection winding 15 is wound in the positive phase and the detection winding 17 is wound in the opposite phase, and the detection windings 12, 14, 15, 17 are connected in series to each other, and the detection winding group is formed. 18 is composed. Here, an AC signal of Sinθ (A phase) is applied to the excitation winding 13 as an excitation signal, and an AC signal of Cosθ (B phase) is applied to the excitation winding 16 as an excitation signal.

With such a configuration, when the rotor 2 is sequentially rotated to 0 °, 90 °, 180 °, and 270 °, when excitation signals of Sinθ and Cosθ are applied to the excitation windings 13 and 16, respectively, A signal as shown in FIG. 8 is induced in the detection windings 12, 14, 15 and 17, and the detection winding group 18 responds to the combined mechanical angle (rotation angle) of the rotor 2. A signal with a phase shift is output. FIG. 9 shows the interrelationship with the stator plates 4 to 11 when the rotor 2 is sequentially rotated as described above, and the gap change for each pair of the stator plates is shown at the right end.

According to the present embodiment as described above, the rotor 2 is eccentric, and the stator 20 is provided with eight stages of stator plates 4 to 11 arranged in the axial direction of the rotor 2 and each having eccentric holes. Since the excitation windings 13 and 16 and the detection windings 12, 14, 15 and 17 are wound around the stator plates 4 to 11 in the axial direction of the rotor 2, each winding 12 to 17 is different from the stator 20. It is separated and wound into a different position. Therefore, the excitation windings 13 and 16 and the detection windings 12, 14, 15, and 17 are not the common excitation magnetic poles of the stator as in the conventional case, but are separately wound at different positions of the stator 20. Therefore, it is not affected by the self-inductance, and a high S / N ratio can be obtained. Also, along with this, it is possible to strengthen against external disturbance such as an external magnetic field. Further, since the stator 20 is constituted by eight stages of stator plates 4 to 11 provided in the axial direction of the rotor 2, the windings for excitation 13, 16 and the windings for detection 12, 14, 15, 17 are wound. Since it can be easily turned, it is excellent in mass productivity. Furthermore, since the stator shape is simplified, the structure of the rotation angle detecting device itself can be simplified.

As another embodiment of the present invention, the winding 13 is used as a detection winding having a positive phase and a winding 16 having a reverse phase, while the windings 12, 14, 15, 17 are used. It is also possible to realize a one-phase excitation two-phase detection method that is combined so that is used as the excitation winding. In this case, the parts can be realized without having to add new ones. Although the example in which the stator plates 4 to 11 constituting the stator 20 are provided in eight steps has been shown, the number is not limited to eight steps, and these can be appropriately changed according to the purpose, application, etc.

[0015]

[Effect of device]

 As described above, according to the present invention, the rotor is eccentric, and the stator is provided with eight stator plates arranged in the axial direction of the rotor, each having an eccentric hole. Since the winding for detection and the winding for detection are wound in a sandwich shape in the axial direction of the rotor, each winding can be wound separately at different positions of the stator, so that a high S / N ratio and an external magnetic field can be obtained. It can be made stronger against external disturbances such as.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a rotation angle detecting device of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a top view showing an arrangement of a pair of stator plates used in this embodiment.

FIG. 4 is a top view showing the arrangement of another pair of stator plates used in this embodiment.

FIG. 5 is a top view showing an arrangement of another pair of stator plates used in this embodiment.

FIG. 6 is a top view showing the arrangement of another pair of stator plates used in this embodiment.

FIG. 7 is a connection diagram showing a connection relationship between an excitation winding and a detection winding used in this embodiment.

FIG. 8 is a waveform diagram of signals flowing in an excitation winding and a detection winding used in this embodiment.

FIG. 9 is a top view showing a positional relationship between a rotor and a stator in this embodiment.

FIG. 10 is a top view showing a positional relationship between a rotor and a stator and a connection relationship between an excitation winding and a detection winding wound around the stator in a conventional example.

[Explanation of symbols]

 2 rotors 4 to 11 stator plates 12, 14, 15, 17 detection windings 13, 16 excitation windings 18 detection winding group 20 stator

Claims (2)

[Scope of utility model registration request] 1. A stator comprising an exciting magnetic pole having an exciting winding and a detecting winding for extracting an induced voltage by the exciting magnetic pole, and a reluctance of a magnetic path passing through the exciting magnetic pole is changed according to a rotation angle. In a rotation angle detection device including a shaped rotor, the rotor is eccentric,
The stator is provided with multi-stage stator plates each having an eccentric hole and arranged in the axial direction of the rotor, and the excitation winding and the detection winding are wound around the multi-stage stator plate in a sandwich shape in the axial direction of the rotor. A rotation angle detecting device characterized in that 2. The rotation according to claim 1, wherein the detection winding comprises a combination of a plurality of windings connected in series so as to have a positive phase and an opposite phase with respect to the excitation winding. Angle detection device.