JP2024004126A - Coil substrate, coil substrate for motor, and motor - Google Patents

Abstract

To provide a coil substrate capable of improving reliability by improving adhesiveness of wiring to a flexible substrate.SOLUTION: A coil substrate 40 includes: a flexible substrate 43 that has 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 and in which wiring w is formed on a first surface F and a second surface B opposite to the first surface F; a plurality of coils C formed on the flexible substrate 43; terminals TU, TV, TW connected to the wiring w forming the coil C; first connection lines L1 connecting the wires w forming the coil C and the terminals TU, TV, TW; and second connection lines L2 connecting the plurality of coils C to each other. The plurality of coils C are arranged from the first side 41 toward the second side 42, and R portions 44, 45 forming a substantially arc-shaped outer edge are formed at a corner portion of the wiring w forming the first connection line L1 or the second connection line L2.SELECTED DRAWING: Figure 3

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 substrate. As shown in FIG. 1(B) of Patent Document 1, the coil board of Patent Document 1 includes a connection wire that connects a plurality of coils in series, and a terminal for connecting the coil and the terminal via the connection wire. Wiring, and are provided.

JP 2021-48718 Publication

<Issues of Patent Document 1>
In the technique disclosed in Patent Document 1, when a connecting wire connecting a coil or a terminal wiring connecting to an external terminal is extended on a flexible substrate, the corner portions are formed at right angles. Therefore, when a coil substrate for a motor is formed by winding a coil substrate into a substantially cylindrical shape, it is considered that the wiring of these connection lines and terminal wiring may be peeled off from the flexible substrate, which is an insulating layer. It is thought that in the motor coil board using Patent Document 1, the adhesiveness of the wiring may be reduced and the reliability may be reduced.

The coil substrate of the present invention has 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 has a first side and a second side opposite to the first side. a flexible substrate on which wiring is formed, a plurality of coils formed on the flexible substrate, a terminal connected to the wiring forming the coil, and a connection between the wiring forming the coil and the terminal. A coil board having a first connection line and a second connection line connecting the plurality of coils, the plurality of coils being lined up from the first side toward the second side, A corner portion of the wiring forming the first connection line or the second connection line is provided with an R portion forming a substantially arc-shaped outer edge.

<Effects of embodiment>
In the coil substrate according to the embodiment of the present invention, an R section is provided at a corner of the wiring of the first connection line or the second connection line. The outer edge of the R portion has a substantially arc shape. Therefore, when the coil substrate is wound into a substantially cylindrical shape, the adhesion between the wiring and the flexible substrate can be improved compared to the case where the corners of the wiring of the first connection line or the second connection line are made at right angles. In the motor coil board formed using the coil board of the embodiment, the adhesion of wiring to the flexible board can be improved, and reliability can be improved.

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. It is a partially enlarged view of a part of the first connection line 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 portion P1, a second round portion P2, and a third round portion P3 along the longitudinal direction. When the coil substrate 40 is wound, each of the portions P1, P2, and P3 forms approximately one turn, 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 transverse 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, "adhesiveness of the wiring to the flexible substrate" refers to the adhesiveness of the wiring w 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 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 end of the first wiring w1 and the end of the second wiring w2 are connected by a through-hole conductor TH that penetrates the flexible substrate 43.

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.

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.

As shown in FIG. 3, at least one of the U-phase first connection line L1U, V-phase first connection line L1V, and W-phase first connection line L1W that constitute the first connection line L1 is the first connection line L1U, the V-phase first connection line L1V, and the W-phase first connection line L1W. The corner portions of the wiring w forming L1 are provided with R portions 44 and 45 forming substantially arc-shaped outer edges. The wiring w forming the first connection line L1 has an oblique part 46 between the first side 41 and the second side 42 of the flexible substrate 43, which forms a predetermined angle with respect to the first side 41 and the second side 42. have The oblique portion 46 is inclined at a predetermined angle with respect to a direction perpendicular to the winding direction WD. The R portions 44 and 45 are formed at both ends of the diagonal portion 46, respectively. The R portions 44, 45 and the diagonal portion 46 connect to at least one of the U-phase second connection line L2U, the V-phase second connection line L2V, and the W-phase second connection line L2W that constitute the second connection line L2. The first connecting line L1 is also formed similarly to the first connecting line L1.

<Effects of embodiment>
According to the coil board 40 of the embodiment, R portions 44 and 45 are formed at the corners of the wiring w of the first connection line L1 or the second connection line L2. The outer edges of the R portions 44 and 45 are approximately arcuate. Therefore, when winding the coil substrate 40 into a substantially cylindrical shape, the adhesion between the wiring w and the flexible substrate 43 is improved compared to the case where the corners of the wiring w of the first connection line L1 or the second connection line L2 are made at right angles. You can improve. In the motor coil board 20 formed using the coil board 40 of the embodiment, the adhesion of the wiring w to the flexible board 43 can be improved, and reliability can be improved.

According to the coil board 40 of the embodiment, the diagonal portion 46 is included in the wiring w of the first connection line L1 or the second connection line L2. When the coil substrate 40 is wound, the wiring w is bent in the circumferential direction of the cylindrical shape, compared to the case where the wiring w is formed only in a portion parallel or perpendicular to the first side 41 or the second side 42 of the flexible substrate 43. The formation of corners can be suppressed. According to the coil substrate 40 of the embodiment, the adhesion between the wiring w and the flexible substrate 43 can be further improved. Furthermore, by arranging the diagonal portions 46, corners are not formed near the connection lines when the coil substrate 40 is wound, so it is possible to suppress the occurrence of short circuits.

Although the angle of the diagonal portion 46 is not particularly limited, it is inclined by +5° or more or −5° or more with respect to the imaginary line Z that is substantially perpendicular to the winding direction WD in FIG. Furthermore, it is desirable that the angle is +10° to +45° or −10° to −45° with respect to the virtual line Z. By setting the angle of the inclined portion 46, the motor coil board 20 does not have a polygonal cylindrical shape with a polygonal cross section, but instead has a cylindrical shape with a circular cross section, thereby suppressing the occurrence of short circuits. Note that the imaginary line Z defines the case when viewed from the first surface F, and with respect to the imaginary line Z, those inclined to the right are assumed to be inclined in the + direction.

According to the coil board 40 of the embodiment, the U-phase first connection connects the U-phase coil CU1, V-phase coil CV6, and W-phase coil CW1 with the U-phase terminal TU, V-phase terminal TV, and W-phase terminal TW. R portions 44 and 45 are formed in at least one of the line L1U, the V-phase first connection line L1V, and the W-phase first connection line L1W. It is possible to improve the adhesion between the wiring w of the first connection line L1 related to at least one phase among the U, V, and W phases and the flexible substrate 43.

According to the coil board 40 of the embodiment, at least one of the U-phase second connection line L2U, the V-phase second connection line L2V, and the W-phase second connection line L2W that connect the U-, V-, and W-phase coils C to each other. R portions 44 and 45 are formed at the edges. The adhesion between the flexible substrate 43 and the wiring w of the second connection line L2 related to at least one of the U, V, and W phases can be improved.

<Modified example of embodiment>
The diagonal portion 46 is not formed in the wiring w of the first connection line L1 or the second connection line L2, and is formed only in a portion parallel to or perpendicular to the first side 41 or the second side 42 of the flexible substrate 43. , R portions 44 and 45 may be formed at the corners of the wiring w.

10 : Motor 20 : Motor coil board 30 : Magnet 40 : Coil board 41 : First side 42 : Second side 43 : Flexible board 44 : R part 45 : R part 46 : Diagonal part B : Second surface C : Coil CU1 to CU6: U phase coil CV1 to CV6: V phase coil CW1 to CW6: W phase coil F: First surface L1: First connection line L1U: U phase first connection line L1V: V phase first connection line L1W : W-phase first connection line L2 : Second connection line L2U : U-phase second connection line L2V : V-phase second connection line L2W : W-phase second connection line T : Terminal TU : U-phase terminal TV : V-phase Terminal TW: W-phase terminal w: Wiring

Claims (6)

A flexible flexible material having a first side at one end in the longitudinal direction and a second side at the other end in the longitudinal direction, and wiring is formed on the first surface and a second surface opposite to the first surface. A substrate and
a plurality of coils formed on the flexible substrate;
a terminal connected to the wiring forming the coil;
a first connection line connecting the wiring forming the coil and the terminal;
a second connection line connecting the plurality of coils,
The plurality of coils are coil substrates arranged from the first side toward the second side,
A corner portion of the wiring forming the first connection line or the second connection line is provided with an R portion forming a substantially arc-shaped outer edge. The coil board according to claim 1, wherein the wiring forming the first connection line or the second connection line includes a diagonal part forming a predetermined angle between the first side and the second side,
The R portions are formed at both ends of the diagonal portion. The coil substrate according to claim 1, wherein the plurality of coils are formed by a U-phase coil, a V-phase coil, and a W-phase coil,
A plurality of the terminals are formed by a U-phase terminal, a V-phase terminal, and a W-phase terminal,
A U-phase first connection line that connects the U-phase terminal and the U-phase coil, a V-phase first connection line that connects the V-phase terminal and the V-phase coil, and a W-phase terminal and the W-phase coil. a W-phase first connection line that connects the phase coils, and a plurality of the first connection lines are formed;
The R portion is disposed on at least one of the U-phase first connection line, the V-phase first connection line, and the W-phase first connection line. 2. The coil substrate according to claim 1, wherein the plurality of coils are formed by a plurality of U-phase coils, a plurality of V-phase coils, and a plurality of W-phase coils,
A U-phase second connection line that connects the plurality of U-phase coils, a V-phase second connection line that connects the plurality of V-phase coils, and a W-phase second connection line that connects the plurality of W-phase coils. a plurality of second connection lines are formed by a connection line, and
The R portion is disposed on at least one of the U-phase second connection line, the V-phase second connection line, and the W-phase second connection line. 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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