Motor coil substrate and motor

Abstract

To provide a coil substrate capable of obtaining a motor with a stable performance while securing voltage resistance.SOLUTION: A coil substrate in an embodiment has a flexible substrate having a first face and a second face opposite to the first face and having a first side on one longitudinal end side and a second side on the other longitudinal side, and coils formed by a coil-shaped wiring provided on the first face and a coil-shaped wiring provided on the second face. The flexible substrate can be formed into a cylindrical shape by being wound in a peripheral direction with an axis extending in a direction orthogonal to the longitudinal direction as a center while the first side is a starting point, and has a wiring formation region, on which the wiring is formed, and a non-formation region, on which the wiring is not formed. Longitudinal length (L) of the non-formation region satisfies a relationship of 1 / 3R≤L<R to peripheral length (R) of the outer peripheral surface of the flexible substrate when formed into a cylindrical shape.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a coil substrate, a motor coil substrate formed using the coil substrate, and a motor formed using the motor coil substrate. [Background technology]

[0002] Patent Document 1 discloses a coil substrate having a flexible substrate and spiral wiring formed on both sides of the flexible substrate. The coil substrate is wound into a cylindrical shape to form a motor coil substrate. The formed motor coil substrate is placed inside a cylindrical yoke, and a rotating shaft and magnets are placed inside the motor coil substrate to form a motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-61532 Summary of the Invention

[0004] [Problem of Patent Document 1] In the technology of Patent Document 1, the wiring may be formed on the outermost peripheral surface of a cylindrically formed motor coil substrate. In such cases, even if an insulating adhesive material is interposed between the motor coil substrate and the yoke when the motor coil substrate is placed inside the cylindrical yoke, a short circuit may occur between the motor coil substrate and the yoke when a high voltage is applied. [Means for solving the problem]

[0005] The coil substrate of the present invention has a first surface and a second surface on the opposite side of the first surface, and includes a flexible substrate having a first side on one end side in the longitudinal direction and a second side on the other end side in the longitudinal direction, and a coil formed by a coiled wiring provided on the first surface and a coiled wiring provided on the second surface. The flexible substrate can be formed into a cylindrical shape by being wound a plurality of times in the circumferential direction around an axis extending in a direction orthogonal to the longitudinal direction starting from the first side, and has a wiring formation region where the wiring is formed and a non-formation region where the wiring is not formed. The wiring formation region is a region starting from the wiring formed at a position close to the first side and ending at the wiring formed at a position farthest from the first side. The non-formation region is a region between the end point position and the second side. The length (L) of the non-formation region in the longitudinal direction satisfies the relationship of 1 / 3R ≦ L < R with respect to the circumferential length (R) of the outer peripheral surface of the flexible substrate when formed into a cylindrical shape.

[0006] The coil substrate of an embodiment of the present invention has a non-formation region. The length (L) of the non-formation region in the longitudinal direction satisfies the relationship of 1 / 3R ≦ L < R with respect to the circumferential length (R) of the outer peripheral surface of the flexible substrate when formed into a cylindrical shape. Therefore, when the coil substrate is formed into a cylindrical shape to form a motor coil substrate, a part of the outermost peripheral surface of the motor coil substrate is covered by the non-formation region. A wiring formation region is not arranged on a part of the outermost peripheral surface of the motor coil substrate formed into a cylindrical shape. When the motor coil substrate is arranged inside a cylindrical yoke to form a motor, a short circuit between the motor coil substrate and the yoke is suppressed. When a motor is formed using the coil substrate, the withstand voltage of the motor is ensured, and a motor with stable performance can be obtained.

[0007] The motor coil substrate of the present invention is formed by winding the above-described coil substrate of the present invention into a cylindrical shape. The first surface is arranged on the inner peripheral side, and the second surface is arranged on the outer peripheral side.

[0008] In the motor coil substrate according to the embodiment of the present invention, a portion of the outermost peripheral surface is covered by a non-forming region. In other words, no wiring forming region is disposed on the portion of the outermost peripheral surface. When the motor coil substrate is disposed inside a cylindrical yoke to form a motor, short circuits between the motor coil substrate and the yoke are suppressed. When a motor is formed using the motor coil substrate, the withstand voltage of the motor is ensured, resulting in a motor with stable performance.

[0009] The motor of the present invention is formed by placing the motor coil substrate of the present invention inside a cylindrical yoke, and placing a rotating shaft and a magnet inside the motor coil substrate.

[0010] In the motor according to the embodiment of the present invention, the withstand voltage of the motor is ensured even when a high voltage is applied, and a motor with stable performance is obtained. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view schematically showing a coil substrate according to the embodiment. [Figure 2] FIG. 10 is a perspective view schematically showing a state in the middle of winding the coil substrate into a cylindrical shape according to the embodiment. [Figure 3] FIG. 2 is a perspective view schematically showing a motor coil substrate according to the embodiment. [Figure 4] FIG. 1 is a cross-sectional view schematically showing a motor according to an embodiment. [Figure 5] FIG. 10 is a plan view schematically showing a coil substrate according to a first modified example of the embodiment. [Figure 6] FIG. 10 is a bottom view schematically showing a coil substrate according to a first modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Embodiment] 1 is a plan view showing a coil substrate 2 according to an embodiment. The coil substrate 2 has a flexible substrate 10 and three coils 20, 22, and 24.

[0013] The flexible substrate 10 is a resin substrate having a first surface 10F and a second surface 10B opposite to the first surface 10F. The flexible substrate 10 is formed using an insulating resin such as polyimide or polyamide. The flexible substrate 10 is flexible. The flexible substrate 10 is formed in a rectangular shape having four sides, a first side E1 to a fourth side E4. The first side E1 is a short side at one end in the longitudinal direction of the flexible substrate 10 (the left-right direction in FIG. 1). The second side E2 is a short side at the other end in the longitudinal direction. The third side E3 and the fourth side E4 are both long sides extending along the longitudinal direction. As will be described in detail later, when the coil substrate 2 is wound cylindrically to form the motor coil substrate 50 (see FIG. 3), the first surface 10F is located on the inner periphery and the second surface 10B is located on the outer periphery.

[0014] The coils 20, 22, and 24 are arranged along the longitudinal direction of the flexible substrate 10. The three coils 20, 22, and 24 may respectively constitute the U-phase, V-phase, and W-phase of a three-phase motor. The three coils 20, 22, and 24 are arranged in this order from the first side E1 toward the second side E2. In a modified example, the flexible substrate 10 may be provided with fewer than three coils, or may be provided with four or more coils.

[0015] Coil 20 is formed by forming first wiring 30F, which constitutes half of one turn, on the first surface 10F side, and second wiring 30B, which constitutes the remaining half turn, on the second surface 10B side, with adjacent turns being staggered. In Figure 1, coil 20 has three turns of wiring. First wiring 30F and second wiring 30B, which constitute each turn, are electrically connected via via conductors 31 that penetrate flexible substrate 10.

[0016] Similarly, in coil 22, a first wiring 32F that constitutes half a turn in one turn is formed on the first surface 10F side, and a second wiring 32B that constitutes the remaining half turn is formed on the second surface 10B side. Each adjacent turn is arranged while being shifted, thereby forming the coil 22. The coil 22 includes wiring for three turns. The first wiring 32F and the second wiring 32B that constitute each turn are electrically connected via a via conductor 33. In coil 24, a first wiring 34F that constitutes half a turn in one turn is formed on the first surface 10F side, and a second wiring 34B that constitutes the remaining half turn is formed on the second surface 10B side. Each adjacent turn is arranged while being shifted, thereby forming the coil 24. The coil 24 includes wiring for three turns. The first wiring 34F and the second wiring 34B that constitute each turn are electrically connected via a via conductor 35.

[0017] The flexible substrate 10 is further provided with a wiring formation region 12 where the wirings of the above-described coils 20, 22, and 24 are formed, and a non-formation region 14 where no wiring is formed. The wiring formation region 12 is a region that starts from the first wiring 30F of the coil 20 formed at the position closest to the first side E1 as a starting point 13S and ends at the second wiring 34B of the coil 22 formed at the position farthest from the first side E1 as an end point 13G. The non-formation region 14 is a region between the end point 13G of the wiring formation region 12 and the second side E2. Let the length of this region (i.e., the distance between the end point S and the second side E2) be L. As will be described in detail later, the longitudinal length L of the non-formation region 14 has a relationship of 1 / 3R ≤ L < R with respect to the circumferential length R (see FIG. 2) of the outer peripheral surface of the flexible substrate 10 when the coil substrate 2 is formed in a cylindrical shape.

[0018] Although not shown, the first surface 10F and the first wirings 30F, 32F, 34F are covered with a resin insulation layer. Similarly, the second surface 10B and the second wirings 30B, 32B, 34B are covered with a resin insulation layer.

[0019] FIG. 2 shows the state of the coil substrate 2 of the embodiment being wound into a cylindrical shape. By winding the coil substrate 2 into a cylindrical shape, the motor coil substrate 50 (FIG. 3) of the embodiment is formed. When the coil substrate 2 of the embodiment is wound into a cylindrical shape, the flexible substrate 10 is wound a plurality of times in the circumferential direction around an axis (an axis extending parallel to the first side E1) extending in a direction orthogonal to the longitudinal direction starting from the first side E1. When the coil substrate 2 is wound into a cylindrical shape, the first surface 10F of the flexible substrate 10 is disposed on the inner peripheral side, and the second surface 10B is disposed on the outer peripheral side.

[0020] In FIG. 2, up to the wiring formation region 12 portion of the flexible substrate 10 is wound into a cylindrical shape. At this point, the non-formation region 14 is not yet wound into a cylindrical shape. As shown in FIG. 2, the length (the longitudinal length: L) of the non-formation region 14 has a relationship of 1 / 3R ≦ L < R with respect to the circumferential length R of the outer peripheral surface of the flexible substrate 10 wound into a cylindrical shape.

[0021] FIG. 3 shows the motor coil substrate 50 formed by winding the entire coil substrate 2 into a cylindrical shape. In the motor coil substrate 50, the entire length of the flexible substrate 10 is wound into a cylindrical shape. As described above, the first surface 10F is disposed on the inner peripheral side, and the second surface 10B is disposed on the outer peripheral side. As described above, the length (the longitudinal length: L) of the non-formation region 14 has a relationship of 1 / 3R ≦ L < R with respect to the circumferential length R of the outer peripheral surface of the flexible substrate 10 wound into a cylindrical shape. Therefore, as shown in FIG. 3, a part of the outer peripheral surface of the motor coil substrate 50 is covered by the non-formation region 14. The wiring formation region 12 is not disposed on a part of the outermost peripheral surface of the motor coil substrate 50 formed into a cylindrical shape.

[0022] To clarify the effects of the coil substrate 2 of the embodiment, a first comparative example will be described in which the length (longitudinal length: L) of the non-forming region 14 is equal to or greater than the circumferential length R of the outer circumferential surface of the cylindrically wound flexible substrate 10. The first comparative example has the relationship L≧R. When a motor is formed using the motor coil substrate of the first comparative example, the volume of the motor coil substrate within the motor increases, which restricts the freedom of motor design.

[0023] Conversely, a second comparative example will be described in which the length (longitudinal length: L) of the non-forming region 14 is shorter than 1 / 3 of the circumferential length R of the outer peripheral surface of the cylindrically wound flexible substrate 10. The second comparative example has a relationship of L<1 / 3R. In this case, there are fewer non-forming regions 14 on the outer peripheral surface of the motor coil substrate. Therefore, if a motor is formed using the motor coil substrate of the second comparative example, there is a risk of a short circuit between the motor coil substrate and the yoke.

[0024] 4 is a cross-sectional view schematically showing a motor 100 using the motor coil substrate 50 (FIG. 3) of the embodiment. The motor 100 is formed by placing the motor coil substrate 50 inside a yoke 60, and placing a rotating shaft 80 and a magnet 70 fixed to the rotating shaft 80 inside the motor coil substrate 50.

[0025] As described above, the configurations of the coil substrate 2 (Figs. 1 and 2), the motor coil substrate 50 (Fig. 3), and the motor 100 (Fig. 4) of the embodiment have been described. As shown in Fig. 2, the length L in the longitudinal direction of the non-formation region 14 of the coil substrate 2 has a relationship of 1 / 3R ≦ L < R with respect to the circumferential length R of the outer peripheral surface of the flexible substrate 10 wound in a cylindrical shape. Therefore, as shown in Fig. 3, when the coil substrate 2 is wound multiple times to form a cylindrical shape to form the motor coil substrate 50, a part of the outermost peripheral surface of the motor coil substrate 50 is covered by the non-formation region 14. That is, there is a portion where the wiring formation region 12 is not arranged on the outermost peripheral surface of the motor coil substrate 50 formed in a cylindrical shape. As shown in Fig. 4, when the motor coil substrate 50 is arranged inside the cylindrical yoke 60 to form the motor 100, it is possible to suppress a short circuit between the motor coil substrate 50 and the yoke 60. When a motor is formed using the coil substrate 2, the withstand voltage of the motor 100 is ensured, and a motor 100 with stable performance can be obtained. Further, since there is a portion where the wiring formation region 12 is not arranged on the outermost peripheral surface of the motor coil substrate 50, the volume of the motor coil substrate 50 in the motor 100 does not become too large, and the degree of freedom in motor design is not hindered.

[0026] [First Modified Example of the Embodiment] Figs. 5 and 6 show the first modified example of the embodiment. In the first modified example, the arrangement of the wirings constituting the coils 20, 22, and 24 is different from that of the embodiment. Fig. 5 is a plan view showing the coil substrate 102 of the first modified example. Fig. 6 is a bottom view showing the coil substrate 102 of the first modified example.

[0027] Coil 20 is made up of a coil-shaped first wiring 30F (FIG. 5) provided on first surface 10F and a coil-shaped second wiring 30B (FIG. 6) provided on second surface 10B. First wiring 30F and second wiring 30B are electrically connected through via conductor 31 that penetrates flexible substrate 10. Similarly, coil 22 is made up of a first wiring 32F and second wiring 32B. First wiring 32F and second wiring 32B are electrically connected through via conductor 33. Coil 24 is made up of a first wiring 34F and second wiring 34B. First wiring 34F and second wiring 34B are electrically connected through via conductor 35.

[0028] As shown in FIG. 5, the first wiring 30F is formed in a clockwise spiral shape (hexagonal spiral shape) from the outer periphery to the inner periphery. The via conductor 31 is formed at the inner periphery end of the first wiring 30F. As shown in FIG. 6, the second wiring 30B is formed in a counterclockwise spiral shape (hexagonal spiral shape) from the outer periphery to the inner periphery. The via conductor 31 is formed at the inner periphery end of the second wiring 30B. The first wiring 30F and the second wiring 30B are formed in a spiral shape with the same winding direction when viewed from the same surface. The first wiring 30F and the second wiring 30B are electrically connected in series and function as one coil 20.

[0029] The first wiring 32F and the second wiring 32B, and the first wiring 34F and the second wiring 34B have the same relationship as the first wiring 30F and the second wiring 30B described above. The first wiring 32F and the second wiring 32B are formed in a spiral shape with the same winding direction when viewed from the same surface. The first wiring 32F and the second wiring 32B function as one coil 22 electrically connected in series. The first wiring 34F and the second wiring 34B are formed in a spiral shape with the same winding direction when viewed from the same surface. The first wiring 34F and the second wiring 34B function as one coil 24 electrically connected in series.

[0030] The flexible substrate 10 is provided with a wiring formation region 12 in which wirings of coils 20, 22, and 24 are formed, and a non-formation region 14 in which no wiring is formed. The length L in the longitudinal direction of the non-formation region 14 of the coil substrate 2 satisfies the relationship of 1 / 3R ≦ L < R with respect to the circumferential length R of the outer peripheral surface of the flexible substrate 10 wound in a cylindrical shape.

[0031] Although not shown, the first surface 10F and the first wirings 30F, 32F, and 34F are covered with a resin insulating layer. Similarly, the second surface 10B and the second wirings 30B, 32B, and 34B are covered with a resin insulating layer.

[0032] When the motor coil substrate 50 (see FIG. 3) is formed using the coil substrate 102 (FIGS. 5 and 6) of the first modification example, a part of the outermost peripheral surface is covered by the non-formation region 14. That is, there is a portion on the outermost peripheral surface of the motor coil substrate 50 formed in a cylindrical shape where the wiring formation region 12 is not arranged. That is, the wiring formation region 12 is not arranged on the outermost peripheral surface of the motor coil substrate 50 formed in a cylindrical shape. When the motor 100 is formed, short circuit between the motor coil substrate 50 and the yoke 60 is suppressed. When a motor is formed using the coil substrate 102, the withstand voltage of the motor 100 is ensured, and a motor 100 with stable performance can be obtained. Further, since there is a portion on the outermost peripheral surface of the motor coil substrate 50 where the wiring formation region 12 is not arranged, the volume of the motor coil substrate 50 in the motor 100 does not become too large, and the degree of freedom in motor design is not inhibited.

Explanation of Reference Numerals

Claims

1. a flexible substrate having a first surface and a second surface opposite to the first surface, and having a first side at one end in a longitudinal direction and a second side at the other end in the longitudinal direction; a coil substrate having a coil formed by a coil-shaped wiring provided on the first surface and a coil-shaped wiring provided on the second surface, A motor coil substrate formed by winding the coil substrate into a cylindrical shape, the flexible substrate can be formed into a cylindrical shape by being wound a plurality of times in a circumferential direction around an axis extending in a direction perpendicular to the longitudinal direction, starting from the first side, and has a wiring formation region in which the wiring is formed and a non-formation region in which the wiring is not formed, the wiring formation region is a region having the wiring formed at a position close to the first side as a starting point and the wiring formed at a position farthest from the first side as an end point, the non-forming region is a region between the end point position and the second side, The longitudinal length (L) of the non-forming area satisfies the relationship 1 / 3R≦L<R with respect to the circumferential length (R) of the outer peripheral surface of the flexible substrate when formed into a cylindrical shape, and a portion of the wiring forming area on the outermost peripheral surface of the motor coil substrate is covered by the non-forming area.

2. 2. The motor coil substrate according to claim 1, wherein the first surface is disposed on an inner circumferential side, and the second surface is disposed on an outer circumferential side.

3. A coil substrate for a motor according to claim 1, the coiled wiring on the first surface comprises half turns; the coiled wiring on the second surface comprises a half turn; The first wiring and the second wiring constituting each turn are electrically connected through via conductors that penetrate the flexible substrate, Adjacent turns are staggered.

4. 10. A motor formed by disposing the motor coil substrate according to claim 1 inside a cylindrical yoke, and disposing a rotating shaft and a magnet inside said motor coil substrate.

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