JP4644055B2 - High precision angle detector - Google Patents

Description

  The present invention relates to a high-precision angle detector provided with a magnetic shield plate between a transformer winding for supplying power and a resolver winding for detecting a rotation angle, and more particularly, a high-characteristic characteristic of case mounting means for a transformer winding. The present invention relates to an accuracy angle detector.

FIG. 4 is a cross-sectional view of an angle detector 100 such as a resolver having a conventional transformer winding.

Conventionally, a transformer rotor 102 is provided opposite to the transformer stator 101, a measurement stator 104 is provided opposite to the measurement rotor 103, and electric power induced in the rotor coil 105 provided in the transformer rotor 102 is used for measurement. Power is supplied to the rotor coil 106 of the rotor 103.

At this time, a transformer stator yoke 108 having a U-shaped cross section is disposed opposite to the transformer rotor yoke 107 having a U-shaped cross section.
The transformer stator yoke 108 includes an annular transformer upper stator yoke 109 and a transformer lower stator yoke 110 having a substantially L-shaped cross section.
In the case 111 for storing them, two step portions 112 and 113 are formed inside thereof.
In each stepped portion 112 and 113 of the case 111 respectively abut placed individually and measuring the stator yokes 115 and transformer stator yoke 108 (e.g., see Patent Document 1). In the case of a small angle detector, since the thickness of the case 111 itself is thin, the step widths of the step portions 112 and 113 are also reduced accordingly.

  When the transformer stator yoke 108 is formed by press forming of a thin steel plate, the corner D of the transformer lower stator yoke 110 mounted on the step portion 113 has a roundness wider than the step width of the step portion 113 (roundness during press forming). ), The transformer lower stator yoke 110 slides down from the stepped portion 113, rattles or vibrates therewith, and the transformer stator yoke 108 does not correctly face the transformer rotor yoke 107. Winding output fluctuates.

  Further, since the transformer rotor yoke 107 and the transformer stator yoke 108 are separated from each other, a leakage magnetic flux is generated between them. Furthermore, when the magnetic flux density of the yoke is saturated, the leakage magnetic flux increases.

Therefore, an annular shield plate 116 is arranged at a distance between the transformer stator yoke 108 and the measurement stator yoke 115. The positioning of the shield plate 116 has to be performed by the collar 117 provided continuously with the measurement stator yoke 115.
JP 2004-157109 A

  In order to adopt such a configuration, conventionally, there has been a restriction that a shape with no rounded corners and a manufacturing method without rounded corners must be used so that the corners of the transformer stator yoke are placed on the stepped portion of the case. In addition, the shape of the case becomes longer in the axial direction, which makes it difficult to reduce the size.

In view of the above problems, the object of the present invention is to provide a shielding effect without limiting the manufacturing method of the transformer stator yoke, and even if the corner of the transformer stator yoke is somewhat rounded, the step portion of the case It is another object of the present invention to provide a highly accurate angle detector that can be mounted without shifting from the stepped portion.

The present invention adopts the following solutions in order to achieve the above object.
(1) A case in which a high-precision angle detector having a magnetic shield plate between a transformer winding for power supply and a resolver winding for detecting a rotation angle is provided with an annular step inside a cylindrical body When an annular shield plate made of a magnetic material, and a substantially U-shaped cross section of the transformer stator yokes housing the transformer stator coil, the transformer stator yoke includes a transformer stator yoke on the annular plate consists of a lower transformer stator yoke a substantially L-shaped cross-section is constructed by press-forming, placing the shield plate to the stepped portion, the lower transformer stator yoke in contact with the shield plate The sectional area of the shield plate and the lower transformer stator yoke that are in contact with each other is prevented from saturating the transmitted magnetic flux density.
(2) above (1) accurate angle detector according is characterized in that integrally formed by the connecting portion and the shield plate and the front SL under the transformer stator yoke.

The present invention has the following effects.
(1) The high-precision angle detector of the present invention has a substantially U-shaped cross-section in which a case in which an annular step is provided inside a cylindrical body, an annular shield plate made of a magnetic material, and a transformer stator coil and a transformer stator yoke, the transformer stator yoke, from a transformer stator yoke on the annular plate, and a lower transformer stator yoke a substantially L-shaped cross-section is constructed by press-forming Since the lower plate stator yoke is placed in contact with the shield plate and the lower transformer stator yoke is placed on the stepped portion, the magnetic flux generated by the transformer stator coil is transferred from the shield plate and the transformer stator yoke. By allowing the magnetic path to pass through, it is possible to prevent leakage to the detection stator coil and the detection rotor coil. Further, even rounded by press molding or the like on the corner of the lower transformer stator yokes, it can be correctly positioned and fixed to the stepped portion of the case.
Further , since the total cross-sectional area of the shield plate and the lower transformer stator yoke that are in contact with each other does not saturate the transmitted magnetic flux density, the magnetic flux generated in the transformer stator coil is composed of the shield plate and the transformer stator yoke. by transmitting a magnetic path, it is possible to not leak to better detection stator coils and the detecting rotor coil.
(2) above (1) accurate angle detector described, and the shield plate, since the integrally formed by a front SL under transformer stator yoke connecting portion, the shield plate and the transformer stator yoke positioning step Can be omitted.

  Embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view of a high-precision angle detector according to a first embodiment of the present invention.
The case 2 of the high-precision angle detector 1 is made of a non-magnetic material, preferably non-magnetic stainless steel, and has a configuration in which two annular step portions 3 and 4 having different depths are provided inside the cylindrical body so as to be separated by two steps. Have. A detection stator yoke 7 having a detection stator coil 6 such as a sine winding or a cosine winding of the detection stator 5 is placed on the step 3 which is deeper in the radial direction.
An annular shield plate 8 made of a magnetic material is placed on the shallower step portion 4 in the radial direction inside the case 2, and a transformer stator 9 made of a magnetic material is in contact with the upper surface of the shield plate 8. A stator yoke 10 for a lower transformer having a substantially L-shaped cross section is placed. Thus, both the shield plate 8 and the lower transformer stator yoke 10 having a substantially L-shaped cross section constitute a magnetic path.

The outer diameter of the annular shield plate 8 is not less than the diameter from the center of the case 2 to the inner corner 4a of the shallower step 4 inside the case 2 so that the shield plate 8 does not fall out of the step 4. , The diameter of the stepped portion 4 is equal to or smaller than the diameter up to the corner 4b.
The transformer stator yoke 12 is made of a magnetic material, and is formed, for example, by pressing, from an upper transformer stator yoke 11 of an annular plate and a lower transformer stator yoke 10 having a substantially L-shaped cross section. Configure. The transformer stator 9 includes an upper transformer stator yoke 11 of an annular plate, a lower transformer stator yoke 10 having a substantially L-shaped cross section, and a transformer stator coil 13 housed between the yokes.
The total cross-sectional area of the lower transformer stator yoke 10 and the shield plate 8 joined together as described above (the cross-sectional area cut along the axial surface) is for the lower transformer. The cross-sectional area of the stator yoke 10 alone is much larger. Even when the magnetic flux is generated by the transformer stator coil 13, the magnetic flux density may be saturated and the magnetic flux leaks between the gaps in the sectional area of the lower transformer stator yoke 10 alone having a substantially L-shaped cross section. With the total cross-sectional area of the lower transformer stator yoke 10 and the shield plate 8 having a substantially L-shaped cross section, the magnetic flux density can be prevented from being saturated and magnetic flux leakage can be prevented. However, although the shield plate 8 is not provided in the upper transformer stator yoke 11, there is no problem because there is no object to be affected by the leakage magnetic flux nearby.

  The transformer rotor 14 is composed of a transformer rotor yoke 15 and a transformer rotor coil 16, and the end surface S1 of the transformer rotor yoke 15 is on the side that receives the magnetic flux generated by the transformer stator 9. The stator yokes 10 and 11 are formed to have an area equal to or larger than the end surface S2 of the stator yokes 11 and face the stator side end surface.

  The magnetic flux passing through the transformer rotor yoke 15 of the transformer rotor 14 passes through the lower transformer stator yoke 10 and the shield plate 8 without saturation while inducing a voltage in the transformer rotor coil 16. For this reason, even if the magnetic flux density is somewhat saturated at the end surface S1 of the transformer rotor yoke 15 of the transformer rotor 14, there is no magnetic flux leakage to the detection stator coil 6 and the detection rotor coil 17 that are separated from each other. The detection rotor 18 includes a detection rotor yoke 19 and a detection rotor coil 17. The transformer rotor 14 and the detection rotor 18 are fixed to the shaft.

  In addition, a shield plate 8 made of a magnetic material is placed on the shallower step portion 4 inside the case 2, and a cross section L of the transformer stator 9 made of a magnetic material is in contact with the shield plate 8. Since the lower transformer stator yoke 10 is mounted, the lower transformer stator yoke 10 having a substantially L-shaped cross section is formed so that the corner A is rounded by a sheet steel press forming means or the like. The shield plate 8 is correctly positioned and fixed to the step portion 4 of the case 2 so that it does not fall from the step portion 4 and cause a failure as in the prior art.

  In the embodiment described above, the lower transformer stator yoke 10 having a substantially L-shaped cross section in the transformer stator yoke 12 is placed on the shield plate 8 placed on the stepped portion. In order to prevent the magnetic flux generated in the transformer stator coil 13 from affecting the detection stator coil 6 and the detection rotor coil 17, that is, to prevent leakage, the upper transformer of the annular plate is placed on the shield plate 8. A stator yoke 11 may be provided.

  FIG. 2 is a cross-sectional view of a high-precision angle detector according to the second embodiment of the present invention.

In FIG. 2, the same components as those of the high-precision angle detector 1 in FIG.

  The transformer stator 21 of the high-precision angle detector 20 in FIG. 2 includes a transformer stator yoke 22 and a transformer stator coil 13. The transformer stator yoke 22 includes an upper transformer stator yoke 11 of an annular plate and a lower transformer stator yoke molded body 23 having a substantially L-shaped cross section, and a lower transformer having a substantially L-shaped cross section in the first embodiment of FIG. The lower transformer stator yoke portion 25 corresponding to the substantially stator-shaped stator yoke 10 and the annular shield plate portion 26 corresponding to the annular shield plate 8 in the first embodiment of FIG. It has the characteristic in the structure connected and formed. This configuration includes the lower transformer stator yoke portion 25 having a substantially L-shaped cross-section corresponding to the L-shaped stator yoke 10 having a substantially L-shaped cross-section in FIG. 1, including the configuration and materials, and the annular shield plate in FIG. 8 in which the corresponding annular shield plate portion 26 including the configuration and material is integrally connected by the connecting portion 24, and is subjected to forming processing such as punching and bending by a continuous pressing process of the thin steel plate. The shield plate portion 26 connected to the connecting portion can solve the problem of easy manufacture and the conventional L-shaped corner B being rounded and falling from the step portion 4 to change its position. In addition, since the lower transformer stator yoke portion 25 and the annular shield plate portion 26 are integrally connected by the connecting portion 24, the lower transformer stator yoke portion 25 and the annular shield plate portion 26 can be easily formed by continuous molding such as a press. Positioning becomes easy, and the assembly process can be shortened.

  Further, when the lower transformer stator yoke 10 and the annular shield plate 8 are formed separately as in the embodiment of FIG. 1, when they are assembled in the case 2, their end faces However, when the lower transformer stator yoke portion 25 and the annular shield plate portion 26 are integrally connected by the connecting portion 24 as in the embodiment of FIG. As a matter of course, since the end surfaces of both the portions 25 and 26 are aligned as the connecting portion 24, the aligning step can be omitted, and the uneven distribution of the magnetic field due to the uneven end surfaces can be avoided.

  Further, by extending the end of the shield plate portion 26 from the corner B to the outside in the radial direction starting from the connecting portion 24, the stepped portion 4 having the shallower corner B will not slide down, and the stator yoke molded body for the lower transformer 23 is positioned and fixed to the stepped portion 4.

  The transformer stator yoke 22 is provided so that the connecting portion 24 faces one of the transformer rotor yokes 15 of the transformer rotor 14 when the shield plate portion 26 is placed on the stepped portion 4 of the case 2.

  FIG. 3 is a sectional view of a high-precision angle detector according to the third embodiment of the present invention.

In FIG. 3, the same components as those of the high-precision angle detectors 1 and 20 of FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  The transformer stator 31 shown in FIG. 3 includes a transformer stator yoke 32 and a transformer stator coil 13. The transformer stator yoke 32 includes an upper transformer stator yoke 11 of an annular plate and a lower transformer stator yoke molding 33 having a substantially L-shaped cross section, and is made of a magnetic material.

  The lower transformer stator yoke molded body 33 having a substantially L-shaped cross section is provided with a first connecting portion 35 at one end of the lower transformer stator yoke portion 34 having a substantially L-shaped cross section, and the first connecting portion 35 is used as a starting point. The shield plate portion 37 is provided so as to be in contact with the lower transformer stator yoke portion 34 having a substantially L-shaped cross section. On the other hand, a second connecting portion 36 is provided at the other end of the lower transformer stator yoke portion 34, and the cylindrical annular locking portion 38 is folded back and contacts the lower transformer stator yoke portion 34 with the second connecting portion 36 as a starting point. Provided.

  Since the cylindrical annular locking portion 38 is provided on the outermost peripheral side (case 2 side) of the stator yoke molded body 33 for the lower transformer having a substantially L-shaped cross section, the tip thereof is the shallower step portion of the case 2. 4 is securely locked. As a result, even if the shield plate portion 37 may come off from the step 4 inside the case 2, the annular locking portion 38 closest to the inside of the case 2 is securely locked to the step 4 inside the case 2. Is done.

  As a result, the substantially L-shaped transformer stator yoke portion 34, the annular shield plate portion 37, and the cylindrical annular locking portion 38 can be integrally connected, and can be easily performed by continuous molding such as a press. It can be formed, positioning becomes easy, and the assembly process can be shortened.

  When the tip of the cylindrical annular locking portion 38 comes into contact with the step portion 4 of the case 2, the first connecting portion 35 is opposed to one side of the transformer rotor yoke 15, and the shield plate portion 37 is mounted on the step portion 4. It arrange | positions so that it may place or remove | deviate from the said step part 4. FIG. As a result, the lower transformer stator yoke portion 34 can be reliably placed on the stepped portion of the case 2.

  The present invention is a technique for locking a magnetic path configuration object to a stepped portion by a member that forms a magnetic path, and is applicable to a field having a similar configuration.

It is sectional drawing of the high precision angle detector of Example 1 of this invention. It is sectional drawing of the high precision angle detector of Example 2 of this invention. It is sectional drawing of the high precision angle detector of Example 3 of this invention. It is sectional drawing of angle detectors, such as a resolver which has the conventional transformer winding.

1, 20, 30 High-precision angle detector 2 Case 3 Deep step 4 Shallow step 5 Detection stator 6 Detection stator coil 7 Detection stator yoke 8 Shield plates 9, 21, 31 Transformer stator 10 Lower transformer stator yoke 11 having a substantially L-shaped cross section Upper transformer stator yoke 12, 22, 32 Transformer stator yoke
13 Transformer stator coil 14 Transformer rotor 15 Transformer rotor yoke 16 Transformer rotor coil 17 Detection rotor coil 18 Detection rotor 19 Detection rotor yoke 23, 33 Lower transformer stator yoke molded body 24 having a substantially L-shaped cross section Connecting portion
25, 34 Stator yoke portion 26, 37 for lower transformer having substantially L-shaped cross section Shield plate portion 35 First connecting portion 36 Second connecting portion 38 Annular locking portion

Claims (2)

A high-precision angle detector comprising a magnetic shield plate between a transformer winding for power supply and a resolver winding for rotation angle detection,
Includes a case having a step portion of the annular inner cylinder, an annular shield plate made of a magnetic material, and a substantially U-shaped cross section of the transformer stator yokes housing the transformer stator coil,
The transformer stator yoke includes an upper transformer stator yoke having an annular plate and a lower transformer stator yoke having a substantially L-shaped cross section and press-molded.
Placing the shield plate on the stepped portion, placing the lower transformer stator yoke in contact with the shield plate;
A high-precision angle detector characterized in that a cross-sectional area between the shield plate and the lower transformer stator yoke that are in contact with each other does not saturate a transmitted magnetic flux density. Precision angle detector according to claim 1, characterized in that integrally formed by the connecting portion and the shield plate and the front SL under the transformer stator yoke.

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