JP2024007692A - Coil substrate, motor coil substrate, and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil substrate that can improve the adhesion between wiring closest to a winding end side and a flexible substrate.

SOLUTION: A coil substrate 40 includes: a flexible substrate 43 having a first surface F and a second surface B; and a plurality of coils C formed on the flexible substrate 43. The flexible substrate 43 includes a first side 41 on one end side in a longitudinal direction and a second side 42 on the other end side in the longitudinal direction. The plurality of coils C are arranged substantially in a line from the first side 41 to the second side 42. Each of the plurality of coils C is formed by a central space S and wiring w surrounding the central space S. The wiring w forming the coil C includes first wiring w1 on the first surface F and second wiring w2 on the second surface B. The first wiring w1 closest to the second side 42 includes an R portion 44 forming a substantially arc-shaped outer edge.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The technology disclosed in this specification relates to a coil substrate, a motor coil substrate, and a motor.

Patent Document 1 discloses a coil board for a motor. As shown in FIG. 2(A) of Patent Document 1, the motor coil substrate of Patent Document 1 is formed by winding a coil substrate including a flexible substrate having a plurality of coils into a substantially cylindrical shape.

Japanese Patent Application Publication No. 2021-197446

<Issues of Patent Document 1>
In the technique disclosed in Patent Document 1, a coil substrate for a motor is formed by winding a coil substrate including a flexible substrate having a plurality of coils into a substantially cylindrical shape. Therefore, it is thought that the wiring of the coil at the end of winding may be peeled off from the flexible substrate, which is an insulating layer. In the motor coil substrate of Patent Document 1, it is thought that peeling may cause a poor appearance, a decrease in reliability, and problems in installing the motor.

The coil substrate of the present invention includes a flexible substrate having a first surface and a second surface opposite to the first surface, and a plurality of coils formed on the flexible substrate, and a plurality of coils formed on the flexible substrate. includes 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 the plurality of coils are arranged substantially in a line from the first side to the second side. Each of the plurality of coils is formed of a central space and wiring surrounding the central space, and the wiring forming the coil includes a first wiring on the first surface and a wiring on the second surface. a second wiring, and the first wiring closest to the second side includes an R portion forming an outer edge of a substantially arc shape.

<Effects of embodiment>
In the coil substrate according to the embodiment of the present invention, the motor coil substrate is formed by starting winding from the first side of the flexible substrate at one end in the longitudinal direction. The second side on the other end side in the longitudinal direction is the winding end side. In the coil board of the embodiment, the R portion is provided on the first wiring closest to the second side on the other end side in the longitudinal direction. The outer edge of the R portion has a substantially arc shape. The outer edge of the first wiring located at the end of winding has a substantially arc shape. Therefore, even when the first wiring is wound into a substantially cylindrical shape, the adhesion between the first wiring and the flexible substrate can be improved compared to the case where the outer edge of the first wiring is not shaped into a substantially circular arc shape but has a pointed shape or a substantially right-angled shape. In the motor coil substrate formed using the coil substrate of the embodiment, it is possible to suppress appearance defects and the occurrence of problems during installation of the motor, and improve reliability.

FIG. 1(A) is a schematic diagram of a motor according to an embodiment, and FIG. 1(B) is a schematic diagram of a motor coil board according to an embodiment. FIG. 2 is a schematic diagram of a coil substrate according to an embodiment. FIG. 2 is a partially enlarged view of a region near a through hole of a coil located at the end of winding in the coil substrate of the embodiment.

<Embodiment>
As shown in FIG. 1(A), the motor 10 includes a motor coil board 20 and a magnet 30. An example of motor 10 is a brushless motor. As shown in FIG. 1(B), the motor coil board 20 has a coil board 40 with the first side 41 at the winding start side, the second side 42 at the winding end side, and the first side F at the outer peripheral side. It is formed by winding it into a substantially cylindrical shape with the second side B as the inner peripheral side. In the example of FIG. 1(B), the motor coil board 20 is formed by winding the coil board 40 three times. Note that the number of times the coil substrate is wound does not have to be three times, and may be one time or four or more times.

As shown in FIG. 2, the coil substrate 40 includes a flexible substrate 43, a plurality of coils C, a plurality of terminals T, a plurality of first connection lines L1, and a plurality of second connection lines L2. The coil substrate 40 has a first round part P1, a second round part P2, and a third round part P3 along the longitudinal direction. When the coil substrate 40 is wound, each of the portions P1, P2, and P3 generally forms one circumference, as shown in FIG. 1(B). The first round portion P1 is wound on the innermost side, and the third round portion P3 is wound on the outermost side. As shown in FIG. 2, the coil substrate 40 has a portion P4 and a portion P5 in the lateral direction. A plurality of coils C are formed in the portion P4, and a plurality of first connection lines L1 and a plurality of second connection lines L2 are formed in the portion P5.

The flexible substrate 43 has a first side 41 at one end in the longitudinal direction and a second side 42 at the other end in the longitudinal direction. On the first surface F and the second surface B, which is the opposite side of the first surface, of the flexible substrate 43, there are wiring w forming the coil C, and wiring w forming the first connection line L1 and the second connection line L2. is formed. An example of the flexible substrate 43 is a substrate in which the surface of a thin base material made of polyimide on which wiring w is formed is coated with an insulating resin. In the present embodiment, "adhesion between the first wiring and the flexible substrate" refers to the adhesion of the first wiring w1 to the base material of the flexible substrate 43.

A plurality of coils C are formed on a flexible substrate 43. The plurality of coils C are lined up in a line from the first side 41 toward the second side 42 along the winding direction WD. The plurality of coils C include U-phase coils CU1 to CU6, V-phase coils CV1 to CV6, and W-phase coils CW1 to CW6. Each of the plurality of coils CU1 to CW6 is arranged such that the U-phase coil, V-phase coil, and W-phase coil partially overlap. The U-phase coils CU1 and CU2 of the portion P1 of the first turn, the U-phase coils CU3 and CU4 of the portion P2 of the second turn, and the U-phase coils CU5 and CU6 of the portion P3 of the third turn are shown in FIG. 1(B). As shown in FIG. 2, the coil substrates 40 are arranged so as to overlap each other in a wound state. The V-phase coils CV1 and CV2 of the first round part P1, the V-phase coils CV3 and CV4 of the second round part P2, and the V-phase coils CV5 and CV6 of the third round part P3 are wound by the coil board 40. They are arranged so that they overlap in the open state. The W-phase coils CW1 and CW2 in the first rotation portion P1, the W-phase coils CW3 and CW4 in the second rotation portion P2, and the W-phase coils CW5 and CW6 in the third rotation portion P3 are wound by the coil board 40. They are arranged so that they overlap in the open state.

In the U-phase coils CU1, CU3, and CU5, wiring w is wound counterclockwise when viewed from the outer peripheral side of the motor coil board 20. In the U-phase coils CU2, CU4, and CU6, wiring w is wound clockwise when viewed from the outer circumferential side of the motor coil board 20. In the U-phase coils CU1, CU3, CU5 and the U-phase coils CU2, CU4, CU6, the direction of the current flowing through the U-phase coils CU1, CU3, CU5 is opposite to the direction of the current flowing through the U-phase coils CU2, CU4, CU6. , they are connected by the U-phase second connection line L2U. The U-phase coils CU2, CU4 and the U-phase coils CU3, CU5 are connected to the U-phase second connection so that the direction of the current flowing through the U-phase coils CU2, CU4 is opposite to the direction of the current flowing through the U-phase coils CU3, CU5. They are connected by line L2U. The V-phase coils CV1 to CV6 and the W-phase coils CW1 to CW6 are also configured and connected in the same manner as the U-phase coils CU1 to CU6.

Each of the plurality of coils C is formed of a central space S and a wiring w surrounding the central space S. Each turn of each coil C is formed by a first wiring w1 on the first side 41 side of the flexible substrate 43 and a second wiring w2 on the second side 42 side. The first wiring w1 is formed on the first surface F of the flexible substrate 43, and the second wiring w2 is formed on the second surface B. The flexible substrate 43 has through holes TH passing through the flexible substrate 43 at the ends of the first wiring w1 and the second wiring w2. The end of the first wiring w1 and the end of the second wiring w2 are connected by a via wiring wb filled in the through hole TH.

The plurality of terminals T are connected to wiring w forming a plurality of coils C. The plurality of terminals T include a U-phase terminal TU, a V-phase terminal TV, and a W-phase terminal TW. By connecting each terminal T with external wiring or connecting it with another circuit board, the function as the motor coil board 20 is exhibited.

The plurality of first connection lines L1 connect the wiring w forming the coil C and the terminal T. The plurality of first connection lines L1 include a U-phase first connection line L1U, a V-phase first connection line L1V, and a W-phase first connection line L1W. The U-phase first connection line L1U connects the U-phase terminal TU and the U-phase coil CU1. The V-phase first connection line L1V connects the V-phase terminal TV and the V-phase coil CV6. The W-phase first connection line L1W connects the W-phase terminal TW and the W-phase coil CW1. In the example of FIG. 2, the U-phase first connection line L1U, the V-phase first connection line L1V, and the W-phase first connection line L1W are formed on the first surface F of the flexible substrate 43.

The plurality of second connection lines L2 connect the plurality of coils C to each other. The plurality of second connection lines L2 include a U-phase second connection line L2U, a V-phase second connection line L2V, and a W-phase second connection line L2W. The U-phase second connection line L2U connects U-phase coils CU1 and CU2, U-phase coils CU2 and CU3, U-phase coils CU3 and CU4, U-phase coils CU4 and CU5, and U-phase coils CU5 and CU6. do. The V-phase second connection line L2V connects V-phase coils CV1 and CV2, V-phase coils CV2 and CV3, V-phase coils CV3 and CV4, V-phase coils CV4 and CV5, and V-phase coils CV5 and CV6. do. The W-phase second connection line L2W connects the W-phase coils CW1 and CW2, the W-phase coils CW2 and CW3, the W-phase coils CW3 and CW4, the W-phase coils CW4 and CW5, and the W-phase coils CW5 and CW6. do.

In the example of FIG. 2, the U-phase second connection line L2U that connects the U-phase coils CU2 and CU3 and the U-phase coils CU4 and CU5 is formed on the first surface F of the flexible substrate 43. A V-phase second connection line L2V connecting the V-phase coils CV2 and CV3 and the V-phase coils CV4 and CV5 is also formed on the first surface F. A W-phase second connection line L2W connecting the W-phase coils CW2 and CW3 and the W-phase coils CW4 and CW5 is also formed on the first surface F. The second connection line L2 other than the above is formed on the second surface B of the flexible substrate 43.

The wiring w forming the coil C and the wiring w forming the first connection line L1 and the second connection line L2 are formed using printed wiring board technology. The wiring w is formed by plating. The wiring w is formed by etching copper foil. The wiring w may be formed by a semi-additive method, an MSAP method, or a subtractive method.

FIG. 3 is a partially enlarged view of a region A near the through hole TH on one end side in the transverse direction of the coil substrate 40 of the coil CW6 located at the end of winding in the coil substrate 40. In the example of FIG. 3, each through hole TH is formed of three through holes TH1, TH2, and TH3. The three through holes TH1, TH2, and TH3 are arranged in a substantially triangular shape, with the through hole TH1 being closest to the first side 41 and the through hole TH3 being closest to the second side 42. The via wiring wb filled in each through hole TH1, TH2, TH3 connects the end of the first wiring w1 formed on the first surface F and the second wiring w2 formed on the second surface B. Connect the ends.

As shown in FIG. 3, the first wiring w1 constituting the turn closest to the second side 42 of the coil CW6 has an R portion 44 forming a substantially arc-shaped outer edge at one end in the lateral direction of the coil substrate 40. Prepare on the side. The R portion 44 is formed in a portion of the first wiring w1 near the through hole TH, at a position shifted from the through hole TH. The R portion 44 is formed closer to the second side 42 than the through hole TH3, which is located closest to the second side 42 among the three through holes TH1, TH2, and TH3 constituting the through hole TH. The arc center Ro of the approximately arc shape of the R portion 44 is located closer to the first side 41 than the R portion 44 is.

The first wiring w1 constituting the turns other than the turn closest to the second side 42 of the coil CW6 includes an R portion 46 having a substantially arc-shaped outer edge on one end side in the lateral direction of the coil substrate 40. The radius r1 of the R portion 44 of the first wiring w1 that constitutes the turn closest to the second side 42 is larger than the radius r2 of the R portion 46 of the other first wiring w1. The radius r1 of the R portion 44 is set to be as large as possible without interfering with the through hole TH3 located closest to the second side 42 among the three through holes TH1, TH2, and TH3.

The region B of the coil CW6 near the through hole TH on the other end side in the lateral direction of the coil substrate 40 is also configured in the same manner as the region A described above.

<Effects of embodiment>
In the coil substrate 40 of the embodiment, the motor coil substrate 20 is formed starting from the first side 41 of the flexible substrate 43 at one end in the longitudinal direction. The second side 42 on the other end in the longitudinal direction is the winding end side. In the coil board 40 of the embodiment, the R portion 44 is provided on the first wiring w1 closest to the second side 42 on the other end side in the longitudinal direction. The outer edge of the R portion 44 has a substantially arc shape. The outer edge of the first wiring w1 located at the end of winding has a substantially arc shape. Therefore, even when the first wiring w1 is wound into a substantially cylindrical shape, the adhesion between the first wiring w1 and the flexible substrate 43 is improved compared to the case where the outer edge of the first wiring w1 is not shaped into a substantially arc shape but has a pointed shape or a substantially right-angled shape. can. In the motor coil substrate 20 formed using the coil substrate 40 of the embodiment, it is possible to suppress appearance defects and the occurrence of problems during installation of the motor 10, and improve reliability.

According to the coil substrate 40 of the embodiment, the R portion 44 is provided at a position shifted from the through hole TH, so the via wiring wb filled in the through hole TH is left uncut. The connection between the first wiring w1 and the second wiring w2 by the via wiring wb in the through hole TH is reliably maintained.

According to the coil substrate 40 of the embodiment, the shape of the R portion 44 can be made into a substantially circular arc shape that goes around the through hole TH3. Since interference between the R portion 44 and the through hole TH3 can be prevented, a good connection between the first wiring w1 and the second wiring w2 can be maintained.

According to the coil board 40 of the embodiment, the substantially circular arc shape of the R portion 44 can be made into a circular arc with a radius as large as possible as long as it does not interfere with the through hole TH3. The adhesion between the first wiring w1 and the flexible substrate 43 can be increased as much as possible.

10: Motor 20: Motor coil board 30: Magnet 40: Coil board 41: First side 42: Second side 43: Flexible board 44: R section B: Second surface C: Coil F: First surface Ro: Arc Center S: Central space TH: Through hole TH1: Through hole TH2: Through hole TH3: Through hole w: Wiring w1: First wiring w2: Second wiring wb: Via wiring

Claims (6)

a flexible substrate having a first surface and a second surface opposite to the first surface;
a plurality of coils formed on the flexible substrate,
The flexible substrate includes a first side on one end side in the longitudinal direction and a second side on the other end side in the longitudinal direction,
The plurality of coils are arranged substantially in a line from the first side toward the second side,
Each of the plurality of coils is formed of a central space and wiring surrounding the central space,
The wiring forming the coil is a coil substrate including a first wiring on the first surface and a second wiring on the second surface,
The first wiring closest to the second side includes an R portion forming an outer edge of a substantially arc shape. The coil substrate according to claim 1,
The flexible substrate has a through hole,
The wiring includes a via wiring that passes through the through hole and connects the first wiring and the second wiring,
The R portion is formed in a portion of the first wiring closest to the second side near the through hole. 3. The coil substrate according to claim 2, wherein the R portion is formed closer to the second side than the through hole. 4. The coil board according to claim 3, wherein the center of the substantially circular arc shape of the R portion is located closer to the first side than the R portion. The coil substrate according to any one of claims 1 to 4, wherein the first side is the winding start side, the second side is the winding end side, the first side is the outer peripheral side, and the second side is the inner peripheral side. A motor coil board formed by winding it into a substantially cylindrical shape. A motor comprising the motor coil substrate according to claim 5 and a magnet.

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