JP2008116353A - Flexible substrate resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible substrate resolver for improving the productivity in a winding, and selecting the number of turns in an analog form. <P>SOLUTION: The flexible substrate resolver includes: a rotor 2; a stator 4 having a plurality of protrusions 3 circumferentially disposed, and radially protruded toward the rotor 2; and a flexible substrate 8 having a surface radially viewing the rotor 2, and formed with an excitation coil 5 and output coils 6, 7 which are patterned. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flexible substrate resolver capable of increasing the productivity of winding and selecting the number of windings in an analog manner.

  As a variable reluctance resolver that is a rotation angle detector, those described in Patent Documents 1 and 2 are known.

  As shown in FIG. 4, the variable reluctance resolver 41 of Patent Document 1 has a rotor 42 at the center, a ring-shaped stator 44 at the outer periphery thereof, and a protrusion protruding from the stator 44 toward the rotor 42. In FIG. 43, an electric wire is wound as a winding of the exciting coil 45 and the output coils 46 and 47. The gap permeance between the rotor 42 and the protrusion 43 of the stator 44 is configured to change in a sine wave shape with respect to the rotation angle Θ. Therefore, by applying an excitation voltage to the excitation coil 45, an output voltage that changes in a sine wave shape with respect to a change in the rotation angle of the rotor 42 can be extracted from the output coils 46 and 47.

  As shown in FIG. 5, the winding type and winding direction are as follows. The positive winding of the exciting coil and the positive winding of the COS output coil are applied to the 0 ° protrusion, and the reverse winding of the exciting coil is applied to the 90 ° protrusion. And different combinations for each projection, such as reverse winding of the SIN output coil.

  As shown in FIG. 6, the variable reluctance resolver 61 of Patent Document 2 has a rotor (not shown) at the center, a stator 64 at the outer periphery thereof, an excitation coil and an output on the protrusion 63 of the stator 64. The winding 65 of the coil is wound.

  The winding 65 is wound in such a manner that pins 66 positioned between the protrusions 63 are raised on both end faces of the stator 64 and the windings 65 are hung on the pins 66 and guided to the protrusions 63.

JP 08-178611 A Japanese Patent Application Laid-Open No. 11-234995

  The variable reluctance resolver 41 in which a plurality of protrusions 43 protrude from the inner periphery of the ring has a narrow space inside the stator 44 and is complicated. It is difficult to wind the protrusion 43 by mechanical winding in this space. Even if the machine is devised so that the machine can be wound, the winding speed is limited, so the productivity is poor.

  In addition, the variable reluctance resolver 61 that guides the winding 65 with the pin 66 can wind the winding only about 0.5 times (half circle) around the protrusion 63, so that the number of windings is only 0.5 increments. Can not. Therefore, the number of windings such as 0.6 times and 0.7 times cannot be realized. For example, even when 14.3 times of winding is desired, the number of windings is only 14 times or 14.5 times. For this reason, the output voltage characteristic of a sine wave shape or a cosine wave shape cannot be obtained with high accuracy.

  Accordingly, an object of the present invention is to provide a flexible substrate resolver that solves the above-described problems, increases the productivity of windings, and can select the number of windings in an analog manner.

  In order to achieve the above object, the present invention provides a rotor, a stator in which a plurality of protrusions protruding in the radial direction of the rotor are arranged in the circumferential direction, and a substrate surface between the rotor and the protrusions. And a flexible substrate on which an exciting coil and an output coil are formed in a pattern.

  The tip surface of the protrusion may face the pattern.

  The coiled pattern may be formed in multiple layers on the flexible substrate.

  A plurality of patterns may be formed in a line on a common flexible substrate, and the flexible substrate may be provided so as to cover the outer periphery of the rotor.

  A cylindrical substrate support in contact with the tip of each protrusion may be attached to each protrusion, and the flexible substrate may be supported along the substrate support.

  The present invention exhibits the following excellent effects.

  (1) The productivity of windings can be increased.

  (2) The number of windings can be selected in an analog manner.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1A and FIG. 1B, a flexible substrate resolver 1 according to the present invention includes a rotor 2 and a plurality of protrusions 3 projecting radially toward the rotor 2 in the circumferential direction. The stator 4 arranged side by side and the flexible substrate 8 on which the substrate surface faces the rotor 2 from the radial direction and the excitation coil 5 and the output coils 6 and 7 are formed in a pattern are provided. The output coil 6 is a COS output coil 6, the output coil 7 is a SIN output coil 7, a combination of the excitation coil 5 and the COS output coil 6 for each protrusion 3, or the excitation coil 5 and the SIN output coil 7. Any of these combinations is formed in a pattern.

  In this embodiment, the rotor 2 has a five-tooth gear shape (in the figure, a pentagonal shape) with cross-sectional contours having apexes at equal intervals. The rotor 2 is disposed inside the stator 4. The stator 4 has a ring portion 4a that surrounds the outer side of the rotor 2, and a protrusion 3 protrudes radially inward from the inner peripheral surface of the ring portion 4a. The length from the inner peripheral surface of the ring portion 4 a to the tip of the protrusion 3 is referred to as the length of the protrusion 3. There are eight protrusions 3, all of which have the same length, and are provided at equal intervals. The protrusion 3 has a tip surface 3 a facing the outer peripheral surface of the rotor 2 at the tip.

  The rotor 2 and the stator 4 are preferably bonded with a thin steel plate (silicon iron or the like) having a high magnetic permeability.

  The patterns of the excitation coil 5 and the output coils 6 and 7 are formed in a plane spiral shape. In this embodiment, each pattern is formed in a rectangular spiral shape that becomes longer in sequence as the four straight sides go out of the center. The tip surface 3a of the protrusion 3 faces this pattern. That is, the front end surface 3a of the protrusion 3 coincides with the central portion 8a of the pattern. There are normal and reverse winding patterns.

  The flexible substrate 8 is obtained by attaching a copper foil to a sheet made of resin such as polyimide, shaping the copper foil into a desired pattern, and attaching another similar sheet thereon. The flexible substrate 8 has good flexibility, and heat resistance can be improved by using a sheet made of a resin having excellent heat resistance such as polyimide.

  A multilayer flexible substrate 9 is formed by bonding a plurality of such flexible substrates 8 together. In this embodiment, the pattern of the excitation coil 5 is formed on one flexible substrate 8, the pattern of the COS output coil 6 is formed on another flexible substrate 8, and the pattern of the SIN output coil 7 is formed on another flexible substrate 8. The multilayer flexible substrate 9 is formed so that each pattern is overlapped at the same position.

  Note that the multilayer flexible substrate 9 may be formed by multilayering patterns.

  In this embodiment, a plurality of patterns are formed side by side in the longitudinal direction on a strip-like common flexible substrate 8. The flexible substrate 8 is provided so as to cover the outer periphery of the rotor 2, and the front end surface 3 a of each projection 3 faces each pattern. That is, the arrangement pitch of the patterns on the flexible substrate 8 is equal to the arrangement pitch of the tip surfaces 3 a of the protrusions 3 on the stator 4.

  In this embodiment, a cylindrical substrate support in contact with the tip of each protrusion 3 is attached to each protrusion 3, and the flexible substrate 8 is supported along the substrate support. Since the substrate support is cylindrical, it is suitable for supporting the rounded flexible substrate 8.

  Although not shown in detail, a groove extending in the axial direction is formed on the outer periphery of the substrate support, and the tip of the protrusion 3 is fitted in this groove. As a result, the substrate support can be accessed from the axial direction and fitted to the protrusion 3 to be attached.

  Here, since the gap permeance between the protrusion 3 of the stator 4 and the rotor 2 changes in a sine wave shape with respect to the rotation angle Θ of the rotor 2, when the rotor 2 rotates, the current flowing in the excitation coil 5 The magnetic path made changes. Therefore, the output voltages output from the output coils 6 and 7 are two sine waves (sine wave and cosine wave) whose phases are shifted from each other by 90 degrees. Therefore, the flexible substrate resolver 1 of the present invention has a rotation angle detection function equivalent to that of a conventional variable reluctance resolver.

  In addition to this, the flexible substrate resolver 1 of the present invention has excellent features not found in the conventional variable reluctance resolver.

  That is, conventionally, it has been difficult to wind the winding by mechanical winding and the productivity is poor. However, according to the present invention, the winding is not performed by winding an electric wire, but the flexible substrate 8 on which a coil pattern is formed. Since the winding is applied by installing the wire, it can be carried out easily and in a short time, and the productivity of the winding can be improved. In particular, in an embodiment using a cylindrical substrate support, the flexible substrate 8 can be installed at a desired position and shape by simply attaching the flexible substrate 8 to the inner periphery of the substrate support. By winding the flexible substrate 8 on the substrate support in advance and fitting the substrate support to the protrusion 3, the winding operation is completed with one touch.

  Further, according to the present invention, since the coil pattern is formed on the flexible substrate 8, the number of windings, which is conventionally restricted to 0.5 times, can be selected without being cut, that is, analog. Accordingly, it is possible to obtain the output voltage characteristics of a sine wave shape and a cosine wave shape with high accuracy.

  Further, according to the present invention, since the coil pattern is formed on the flexible substrate 8, the coil does not require a height in the winding axis direction. Therefore, the length of the protrusion 3 can be shortened. The outer diameter of the stator 4 is reduced by reducing the length of the protrusion 3. Thereby, the flexible substrate resolver 1 of this invention can make the dimension of radial direction small.

  Next, two types of embodiments will be described for combinations of coil types and winding directions. The number of the protrusions 3 is 12 in all, and the numbers # 1 to # 12 of the protrusions 3 are arranged in the circumferential direction.

  As shown in FIG. 2A, in the first type, the positive winding pattern of the exciting coil 5 and the positive winding pattern of the COS output coil 6 are arranged on the protrusions 3 of numbers # 1 to # 3, and the number # 4. The reverse winding pattern of the exciting coil 5 and the reverse winding pattern of the SIN output coil 7 are arranged on the protrusions 3 to 6, and the arrangement is changed for each of the three protrusions 3 as shown in the drawing.

  As shown in FIG. 2 (b), the second type has a number 3 projection arranged with a positive winding pattern of the exciting coil 5 and a pattern with a normal winding COS output coil 6 arranged on the number 3 projection. 3, the reverse winding pattern of the exciting coil 5 and the reverse winding pattern of the SIN output coil 7 are arranged, and the arrangement is changed for each projection 3 as shown in the drawing.

  A pattern is formed on each of the three flexible substrates 8 shown in FIG. 1B according to the first or second type arrangement, and these flexible substrates 8 are bonded together to form a multilayer flexible substrate 9.

  FIG. 3 shows a flexible substrate resolver 31 of an embodiment in which the number of protrusions is changed. The stator 34 of the flexible substrate resolver 31 is provided with twelve protrusions 33 protruding toward the rotor 32 at intervals of a circumferential angle of 30 degrees. Accordingly, the shape of the rotor 2 is changed to, for example, a seven-tooth gear shape, an eight-tooth gear shape, and the like, and appropriately changed so that the number of apexes of the rotor 2 does not become a divisor of the stator protrusions.

  Note that productivity is much higher when the coil is formed on the flexible substrate than when the coil is wound in a sheet shape and the coil is formed on the flexible substrate by an etching process.

It is a figure of the flexible substrate resolver which shows one Embodiment of this invention, (a) is an axial view, (b) is an assembly drawing of a flexible substrate. (A), (b) is a figure which shows the combination of the kind of coil and winding direction by one Embodiment of this invention, respectively. It is an axial view of a flexible substrate resolver showing an embodiment of the present invention. It is an axial view of a conventional variable reluctance resolver. It is a figure which shows the combination of the kind of winding of a conventional variable reluctance type resolver, and a winding direction. It is a fragmentary perspective view of the stator of the conventional variable reluctance type resolver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible substrate resolver 2 Rotor 3 Protrusion 4 Stator 5 Excitation coil 6 COS output coil 7 SIN output coil 8 Flexible substrate

Claims (5)

  A rotor, a stator in which a plurality of protrusions protruding in the radial direction of the rotor are arranged in the circumferential direction, and an excitation coil and an output coil with a substrate surface facing the outer peripheral surface of the rotor between the rotor and the protrusions A flexible substrate resolver comprising: a flexible substrate formed of a pattern.   The flexible substrate resolver according to claim 1, wherein a tip end surface of the protrusion faces the pattern.   3. The flexible substrate resolver according to claim 1, wherein the pattern is formed in a multilayer on the flexible substrate.   The flexible substrate resolver according to claim 1, wherein a plurality of patterns are formed in a line on a common flexible substrate, and the flexible substrate is provided so as to cover the outer periphery of the rotor.   The flexible substrate according to any one of claims 1 to 4, wherein a cylindrical substrate support in contact with a tip of each protrusion is attached to each protrusion, and the flexible substrate is supported along the substrate support. Resolver.

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