Coil substrate for motor, and motor

Abstract

Provided are: a coil substrate for motors with which a motor having stable performance is obtained, and a motor formed by using the coil substrate for motors. This coil substrate for motors according to an embodiment has: a flexible substrate that has a first surface and a second surface on the side opposite to the first surface; and a plurality of coils formed with wires provided on the first surface and the second surface. Using a first end in the longitudinal direction of the flexible substrate as a starting point, a cylindrical shape is formed by winding the flexible substrate in the circumferential direction around a shaft that extends in an orthogonal direction orthogonal to the longitudinal direction. The cylindricity of the outer circumferential surface is greater than 0.0 mm and no more than 0.3 mm.

Description

Technical Field

[0001] The technology disclosed by this specification relates to a coil substrate for a motor and a motor formed using the coil substrate for a motor.

Background Art

[0002] Patent Document 1 discloses a coil substrate having a flexible substrate and spiral coils formed on both sides of the flexible substrate. The coil substrate is wound cylindrically to form a coil substrate for a motor. The formed coil substrate for a motor is disposed inside a cylindrical yoke, and a rotating shaft and a magnet are disposed inside the coil substrate for a motor to form a motor. The flexible substrate of Patent Document 1 has a main portion where the coil is formed and a sub-portion where the coil is not formed and extends from the main portion. By adjusting the length of the sub-portion, the thickness of the coil substrate for a motor is made equal from 0° to 360°. In the technology of Patent Document 1, it is considered that a high-performance motor can be obtained by winding the coil substrate for a motor into a perfect cylindrical shape.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] [Problems of Patent Document 1] However, in the technology of Patent Document 1, it is considered that the adhesive strength between the outer peripheral surface of the perfect cylindrical coil substrate for a motor and the yoke is low. Due to the reaction caused by the rotation of the rotating shaft and the magnet, it is considered that the coil substrate for a motor is easily peeled off from the yoke. As a result, it is considered that stable motor performance cannot be obtained. Furthermore, in the case of a small motor, it is considered that stable motor performance cannot be obtained.

Means for Solving the Problems

[0005] The coil substrate for a motor 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 by wirings provided on the first surface and the second surface. The coil substrate is formed in a cylindrical shape by being wound in a circumferential direction around an axis extending in a direction orthogonal to the longitudinal direction, starting from a first end in the longitudinal direction of the flexible substrate. The cylindricity of the outer peripheral surface is greater than 0.0 mm and equal to or less than 0.3 mm.

[0006] In the coil substrate for a motor of the present invention In the coil substrate for a motor, the cylindricity of the outer peripheral surface is greater than 0.0 mm and equal to or less than 0.3 mm. Therefore, when a motor is formed using the coil substrate for a motor, the adhesive strength between the outer peripheral surface of the coil substrate for a motor and the yoke is higher than when the cylindricity of the outer peripheral surface is 0.0 mm. Even when a reaction force acts due to the rotation of the rotating shaft and the magnet, it is difficult for the coil substrate for a motor to be peeled off from the yoke. In particular, when a small motor is manufactured using the coil substrate for a motor according to an embodiment of the present invention, since a wider contact area between the outer peripheral surface of the coil substrate for a motor and the yoke is ensured, the adhesive strength becomes higher. Therefore, when a motor is formed using the coil substrate for a motor according to the embodiment, stable motor performance can be obtained. Also, when a small motor is formed using the coil substrate for a motor according to the embodiment, it is difficult for the coil substrate for a motor to be peeled off from the yoke. Therefore, stable motor performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor may be greater than 0.0 mm and less than or equal to 0.2 mm. When forming the motor, the adhesive strength with the yoke becomes high and stable. Therefore, even when operating as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and less than or equal to 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 50% or more and 99% or less. When forming the motor, the adhesive strength with the yoke becomes high and high torque can be obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and less than or equal to 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 55% or more and 90% or less. When forming the motor, the adhesive strength with the yoke becomes high and a high-torque motor can be obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and less than or equal to 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 60% or more and 80% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming the motor, the adhesive strength with the yoke becomes high and high torque can be obtained. A motor with high performance can be obtained. Furthermore, even in a small motor, it is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the adhesive strength with the yoke becomes high during motor formation, and the torque can be improved, and a motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 50% or more and 99% or less. When the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm during motor formation, the adhesive strength with the yoke increases, and since the occupancy ratio of the coil of the coil substrate for a motor is as high as 50% or more and 99% or less, high torque can be obtained. Further, even when operated as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 55% or more and 90% or less. When the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm during motor formation, the adhesive strength with the yoke increases, and since the occupancy ratio of the coil of the coil substrate for a motor is as high as 55% or more and 90% or less, high torque can be obtained. Further, even when operated as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor may be 60% or more and 80% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming a motor, the adhesive strength with the yoke increases, and high torque can be obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.3 mm, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. The occupancy ratio of the coil is increased, and high torque can be obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.3 mm, and the ratio of the wiring to the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. Even when the ratio of the wiring is increased, a predetermined cylindrical shape is obtained. As a result, the adhesive strength with the yoke becomes high during motor formation, the occupation ratio of the coil is increased, and high torque is obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the ratio of the wiring to the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. Even when the ratio of the wiring of the coil substrate for a motor is increased and the occupation ratio of the coil is increased, a predetermined cylindrical shape is obtained, and high torque is obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the ratio of the wiring to the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. Even when the ratio of the wiring is increased and the occupation ratio of the coil is increased, a predetermined cylindrical shape is obtained, and high torque is obtained. As a result, the adhesive strength with the yoke becomes high during motor formation and is stabilized. Therefore, even when operated as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.3 mm, the occupation ratio of the coil in the cross section of the coil substrate for a motor is 50% or more and 99% or less, and the ratio of the wiring to the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. The occupation ratio of the coil can be increased, and high torque can be obtained. The adhesive strength with the yoke becomes high during motor formation, and high torque is obtained. A motor with high performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. The occupancy ratio of the coil can be increased, and a motor with a predetermined cylindrical shape and high torque can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. The occupancy ratio of the coil can be increased, and high torque can be obtained. The adhesive strength with the yoke increases during motor formation, and high torque can be obtained. A motor with high performance can be obtained. Furthermore, even when operated as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. The occupancy ratio of the coil can be increased, and a motor with a predetermined cylindrical shape and high torque can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 99.9% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. The occupancy ratio of the coil can be increased, and high torque can be obtained. The adhesive strength with the yoke becomes high during motor formation, and high torque can be obtained. A motor with high performance can be obtained. Also, when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. The occupancy ratio of the coil can be increased, it becomes a predetermined cylindrical shape, and a high-torque motor can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and equal to or less than 0.3 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 80.0% or more and 96.0% or less. The occupancy ratio of the coil can be increased, and high torque can be obtained. When forming the motor, the adhesive strength with the yoke becomes high, and high torque can be obtained. A motor with high performance can be obtained. Furthermore, even when operating as a motor, there is no displacement of the coil substrate for a motor, and a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. The occupancy ratio of the coil can be increased, and a predetermined cylindrical shape can be obtained, and a high-torque motor can be obtained. Therefore, even when operating as a motor, a motor with stable performance can be obtained. In the coil substrate for a motor of the present invention, the cylindricity of the outer peripheral surface of the coil substrate for a motor is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross section of the coil substrate for a motor is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the coil substrate for a motor may be 85.0% or more and 96.0% or less. It is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. As a result, the adhesive strength with the yoke becomes high during motor formation, and it is stabilized. In the coil substrate for a motor of the present invention, the coil may have a first wiring of a half turn formed on the first surface, a second wiring of a half turn formed on the second surface, and a via conductor connecting the first wiring and the second wiring. In the coil substrate for a motor of the present invention, the coil may have a first wiring formed in a spiral shape on the first surface, a second wiring formed in a spiral shape on the second surface, and a via conductor connecting the first wiring and the second wiring. In the coil substrate for a motor of the present invention, the coil substrate for a motor may be used for a slotless motor. In the coil substrate for a motor of the present invention, the outer peripheral surface is formed of a flexible substrate, and the wiring does not have to be exposed. In the coil substrate for a motor of the present invention, an insulating layer for covering the wiring may be formed on the outermost periphery of the coil substrate for a motor. In the coil substrate for a motor of the present invention, the diameter of the outer diameter of the coil substrate for a motor may be 50 mm or less. In the coil substrate for a motor of the present invention, the diameter of the outer diameter of the coil substrate for a motor may be 30 mm or less.

[0007] The motor of the present invention is formed by arranging the above-described coil substrate for a motor of the present invention inside a cylindrical yoke, and arranging a rotating shaft and a magnet inside the coil substrate for a motor.

[0008] of the present invention In the motor, the adhesion strength between the outer peripheral surface of the coil substrate for a motor and the yoke is high. Even if a reaction acts due to the rotation of the rotating shaft and the magnet, it is difficult for the coil substrate for a motor to peel off from the yoke. In particular, when a small-sized motor is manufactured, since a wider contact area between the outer peripheral surface of the coil substrate for a motor and the yoke is ensured, the adhesion strength becomes higher. Therefore, stable motor performance can be obtained. Even when a small-sized motor is formed, stable motor performance can be obtained.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

[0010] [Embodiment] FIG. 1 is a plan view showing the coil substrate 2 of the embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIGS. 3A to 3C are plan views showing the U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W, respectively. FIG. 4 is a plan view comparing the U-phase, V-phase, and W-phase of the coil substrate 2. FIG. 5 is a plan view schematically showing the coil substrate 2 of FIG. 1 in a simplified manner.

[0011] As shown in FIG. 1, the coil substrate 2 includes a flexible substrate 10, a U-phase coil 20U, a V-phase coil 20V, a W-phase coil 20W, a U-phase terminal 40U, a V-phase terminal 40V, a W-phase terminal 40W, a plurality of coil connection lines 50U, 50V, 50W, a plurality of phase connection lines 60U, 60V, and a return line 70W.

[0012] 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 a resin having insulation properties such as polyimide and polyamide. The flexible substrate 10 has flexibility. The flexible substrate 10 is formed in a rectangular shape having four sides of a first side E1 to a fourth side E4. The first side E1 is a short side at one end side in the longitudinal direction (the direction of arrow LD in FIG. 1) of the flexible substrate 10. The second side E2 is a short side at the other end side in the longitudinal direction. Both the first side E1 and the second side E2 are short sides extending along the orthogonal direction (the direction of arrow OD in FIG. 1) orthogonal to the longitudinal direction. Both the third side E3 and the fourth side E4 are long sides extending along the longitudinal direction. As will be described in detail later, when the coil substrate 2 is wound in a cylindrical shape to form a motor coil substrate 550 (see FIG. 6), the first surface 10F is disposed on the inner peripheral side, and the second surface 10B is disposed on the outer peripheral side.

[0013] The flexible substrate 10 has a first region R1 on one end side (the first side E1 side) in the longitudinal direction and a second region R2 adjacent to the first region R1. The second region R2 includes the second side E2.

[0014] The U-phase terminal 40U, V-phase terminal 40V, and W-phase terminal 40W are all formed on the third side E3 of the flexible substrate 10. In the embodiment, the U-phase terminal 40U and the W-phase terminal 40W are arranged within the first region R1. The V-phase terminal 40V is arranged within the second region R2. As shown in FIG. 1, the U-phase terminal 40U is connected to the starting end 20US of the U-phase coil 20U. At the same time, the U-phase terminal 40U is connected to the ending end 20WE of the W-phase coil 20W via the return line 70W. The V-phase terminal 40V is connected to the starting end 20VS of the V-phase coil 20V. At the same time, the V-phase terminal 40V is connected to the ending end 20UE of the U-phase coil 20U via the inter-phase connection line 60U. The W-phase terminal 40W is connected to the starting end 20WS of the W-phase coil 20W. At the same time, the W-phase terminal 40W is connected to the ending end 20VE of the V-phase coil 20V via the inter-phase connection line 60V. That is, in the embodiment, the U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W are delta-connected (see FIG. 5). In other examples, the U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W may be star-connected or otherwise connected.

[0015] The U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W respectively constitute the U-phase, V-phase, and W-phase of the three-phase motor.

[0016] As shown in FIGS. 1, 3A, and 4, the starting end 20US of the U-phase coil 20U is arranged within the first region R1. The ending end 20UE of the U-phase coil 20U is arranged within the second region R2. As shown in FIG. 3A, the U-phase coil 20U includes six coils 31U, 32U, 33U, 34U, 35U, and 36U. The six coils 31U to 36U are arranged in this order from the starting end 20US to the ending end 20UE of the U-phase coil 20U (from the first region R1 to the second region R2). The six coils 31U to 36U are interconnected by the coil interconnection line 50U.

[0017] Each of the six coils 31U to 36U is formed such that the first wiring constituting a half turn in one turn is formed on the first surface 10F side, and the second wiring constituting the remaining half turn is formed on the second surface 10B side, and adjacent turns are arranged while being shifted. The first wiring and the second wiring are electrically connected via via conductors penetrating the flexible substrate 10.

[0018] The starting positions (starting ends) of the first coil 31U, the third coil 33U, and the fifth coil 35U from the starting end 20US of the U-phase coil 20U are arranged on the first surface 10F, and the ending positions (ending ends) are arranged on the second surface 10B. When viewing the flexible substrate 10 from the first surface 10F side, the coils 31U, 33U, and 35U are wound counterclockwise.

[0019] On the other hand, the starting positions (starting ends) of the second coil 32U, the fourth coil 34U, and the sixth coil 36U from the starting end 20US of the U-phase coil 20U are arranged on the second surface 10B, and the ending positions (ending ends) are arranged on the first surface 10F. When viewing the flexible substrate 10 from the first surface 10F side, the coils 32U, 34U, and 36U are wound clockwise.

[0020] As shown in FIG. 2, FIG. 3A, and FIG. 1, a part of the wiring (second wiring) of the coil 31U overlaps a part of the wiring (first wiring) of the adjacent coil 32U via the flexible substrate 10. Similarly, a part of the wiring (second wiring) of the coil 32U overlaps a part of the wiring (first wiring) of the adjacent coil 33U. A part of the wiring (second wiring) of the coil 33U overlaps a part of the wiring (first wiring) of the adjacent coil 34U. A part of the wiring (second wiring) of the coil 34U overlaps a part of the wiring (first wiring) of the adjacent coil 35U. A part of the wiring (second wiring) of the coil 35U overlaps a part of the wiring (first wiring) of the adjacent coil 36U.

[0021] As shown in FIGS. 3A and 1, the coil connection line 50U connecting the coil 31U and the coil 32U, the coil connection line 50U connecting the coil 33U and the coil 34U, and the coil connection line 50U connecting the coil 35U and the coil 36U are arranged on the second surface 10B. On the other hand, the coil connection line 50U connecting the coil 32U and the coil 33U and the coil connection line 50U connecting the coil 34U and the coil 35U are arranged on the first surface 10F. The U-phase terminal 40U and the phase connection line 60U are arranged on the first surface 10F.

[0022] As shown in FIGS. 1, 3B, and 4, the start end 20VS of the V-phase coil 20V is arranged in the second region R2. The end 20VE of the V-phase coil 20V is arranged in the first region R1. As shown in FIG. 3B, the V-phase coil 20V includes six coils 31V, 32V, 33V, 34V, 35V, and 36V. The six coils 31V to 36V are arranged in this order from the start end 20VS to the end 20VE of the V-phase coil 20V (from the second region R2 to the first region R1). The six coils 31V to 36V are interconnected by the coil connection line 50V.

[0023] In each of the six coils 31V to 36V, the first wiring constituting a half turn in one turn is formed on the first surface 10F side, the second wiring constituting the remaining half turn is formed on the second surface 10B side, and adjacent turns are arranged while being shifted. The first wiring and the second wiring are electrically connected via via conductors penetrating the flexible substrate 10.

[0024] The start positions (start ends) of the first coil 31V, the third coil 33V, and the fifth coil 35V from the start end 20VS of the V-phase coil 20V are arranged on the first surface 10F, and the end positions (ends) are arranged on the second surface 10B. When the flexible substrate 10 is viewed from the first surface 10F side, the coils 31V, 33V, and 35V are wound counterclockwise.

[0025] On one hand, the starting ends (starting terminals) of the second coil 32V, the fourth coil 34V, and the sixth coil 36V from the starting end 20VS of the V-phase coil 20V are arranged on the second surface 10B, and the ending positions (ending terminals) are arranged on the first surface 10F. When viewing the flexible substrate 10 from the side of the first surface 10F, the coils 32V, 34V, and 36V are wound clockwise.

[0026] As shown in FIG. 2, FIG. 3B, and FIG. 1, a part of the wiring (first wiring) of the coil 31V overlaps with a part of the wiring (second wiring) of the adjacent coil 32V via the flexible substrate 10. Similarly, a part of the wiring (first wiring) of the coil 32V overlaps with a part of the wiring (second wiring) of the adjacent coil 33V. A part of the wiring (first wiring) of the coil 33V overlaps with a part of the wiring (second wiring) of the adjacent coil 34V. A part of the wiring (first wiring) of the coil 34V overlaps with a part of the wiring (second wiring) of the adjacent coil 35V. A part of the wiring (first wiring) of the coil 35V overlaps with a part of the wiring (second wiring) of the adjacent coil 36V.

[0027] As shown in FIG. 3B and FIG. 1, the coil connection lines 50V connecting the coil 31V and the coil 32V, the coil connection lines 50V connecting the coil 33V and the coil 34V, and the coil connection lines 50V connecting the coil 35V and the coil 36V are arranged on the second surface 10B. On the other hand, the coil connection lines 50V connecting the coil 32V and the coil 33V and the coil connection lines 50V connecting the coil 34V and the coil 35V are arranged on the first surface 10F. The V-phase terminal 40V and the phase connection line 60V are arranged on the first surface 10F.

[0028] As shown in FIGS. 1, 3C, and 4, the start end 20WS of the W-phase coil 20W is disposed within the first region R1. The end end 20WE of the W-phase coil 20W is disposed within the second region R2. As shown in FIG. 3C, the W-phase coil 20W includes six coils 31W, 32W, 33W, 34W, 35W, and 36W. The six coils 31W to 36W are arranged in this order from the start end 20WS to the end end 20WE of the W-phase coil 20W (from the first region R1 to the second region R2). The six coils 31W to 36W are interconnected by coil connection lines 50W.

[0029] Each of the six coils 31W to 36W is formed such that a first wiring constituting a half turn in one turn is formed on the first surface 10F side, a second wiring constituting the remaining half turn is formed on the second surface 10B side, and adjacent turns are arranged while being shifted. The first wiring and the second wiring are electrically connected via via conductors passing through the flexible substrate 10.

[0030] The start positions (start ends) of the first coil 31W, the third coil 33W, and the fifth coil 35W from the start end 20WS of the W-phase coil 20W are disposed on the first surface 10F, and the end positions (end ends) are disposed on the second surface 10B. When viewing the flexible substrate 10 from the first surface 10F side, the coils 31W, 33W, and 35W are wound counterclockwise.

[0031] On the other hand, the start positions (start ends) of the second coil 32W, the fourth coil 34W, and the sixth coil 36W from the start end 20WS of the W-phase coil 20W are disposed on the second surface 10B, and the end positions (end ends) are disposed on the first surface 10F. When viewing the flexible substrate 10 from the first surface 10F side, the coils 32W, 34W, and 36W are wound clockwise.

[0032] As shown in FIGS. 2, 3C, and 1, a part of the wiring (second wiring) of coil 31W overlaps a part of the wiring (first wiring) of the adjacent coil 32W via flexible substrate 10. Similarly, a part of the wiring (second wiring) of coil 32W overlaps a part of the wiring (first wiring) of the adjacent coil 33W. A part of the wiring (second wiring) of coil 33W overlaps a part of the wiring (first wiring) of the adjacent coil 34W. A part of the wiring (second wiring) of coil 34W overlaps a part of the wiring (first wiring) of the adjacent coil 35W. A part of the wiring (second wiring) of coil 35W overlaps a part of the wiring (first wiring) of the adjacent coil 36W.

[0033] As shown in FIGS. 3C and 1, coil connection lines 50W that connect coil 31W and coil 32W, coil connection lines 50W that connect coil 33W and coil 34W, and coil connection lines 50W that connect coil 35W and coil 36W are arranged on the second surface 10B. On the other hand, coil connection lines 50W that connect coil 32W and coil 33W and coil connection lines 50W that connect coil 34W and coil 35W are arranged on the first surface 10F. The W-phase terminal 40W and the return line 70W are arranged on the first surface 10F.

[0034] As shown in FIGS. 3C, 5, and 1, the return line 70W connects between the terminal 20WE at the end of the W-phase coil 20W and the U-phase terminal 40U. The return line 70W extends from the second region R2 across the first region R1.

[0035] Although not shown, the first surface 10F and the wirings of each of the coils 20U, 20V, 20W formed on the first surface 10F, the coil connection lines 50U, 50V, 50W, the phase connection lines 60U, 60V, and the return line 70W are covered with a resin insulation layer. Similarly, the second surface 10B and the wirings of each of the coils 20U, 20V, 20W formed on the second surface 10B, the coil connection lines 50U, 50V, 50W are covered with a resin insulation layer.

[0036] As shown in FIGS. 1, 3A to 3C, in the embodiment, the wirings of the coils 20U, 20V, and 20W are arranged in a hexagonal shape. In other examples, the wirings of the coils 20U, 20V, and 20W may be arranged in any shape such as circular (true circle, ellipse), triangular, quadrangular (square, rectangle, rhombus), pentagonal, or polygonal with seven or more sides. Also, the arrangement shapes of the wirings of all the coils are not limited to being the same, and the arrangement shapes of the wirings may be different between the coils. The number of turns of one coil wiring may be one or more, and preferably three to seven turns. The coil wiring is formed by arranging a half turn on the first surface, arranging a half turn on the second surface, and connecting them with a through hole. Also, a half turn may be arranged on the second surface and a half turn may be arranged on the first surface. At this time, a half turn means half of the coil wiring. Also, a quarter turn may be arranged on the first surface and a quarter turn may be arranged on the second surface, and they may be connected with a through hole to arrange a total of a half turn on the first surface or the second surface. Furthermore, the coil wiring may be arranged on the first surface or the second surface. At this time, the coil wiring on the first surface and the coil wiring on the second surface may be overlapped, partially overlapped, or not overlapped at all.

[0037] The coil substrate 2 of the embodiment is manufactured by an arbitrary method. For example, the coil substrate 2 may be formed by the tenting method using a flexible substrate having a conductor layer (metal foil) as a starting material. In other examples, the coil substrate 2 may be obtained by forming a metal layer on the flexible substrate by printing or the dispensing method. In still other examples, the coil substrate 2 may be obtained by forming a flexible material and a metal layer with a 3D printer.

[0038] FIG. 6 is a perspective view schematically showing a motor coil substrate 550 using the coil substrate 2 (FIGS. 1 to 5) of the embodiment. As shown in FIG. 6, the coil substrate 2 (FIGS. 1 to 5) of the embodiment is wound in a cylindrical shape, whereby the motor coil substrate 550 for a motor is formed. When the coil substrate 2 is wound in a cylindrical shape, it is wound a plurality of times around an axis extending in the orthogonal direction (an axis extending parallel to the first side E1) starting from the first side E1 (FIG. 1). Further, the number of turns of the coil substrate is not particularly limited. When the coil substrate 2 is wound in 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.

[0039] FIG. 7 schematically shows the positions of the respective terminals when the motor coil substrate 550 is viewed along the axial direction. As shown in FIG. 7, the U-phase terminal 40U, the V-phase terminal 40V, and the W-phase terminal 40W are arranged at substantially 120° intervals in the circumferential direction. The U-phase terminal 40U and the W-phase terminal 40W are disposed on the inner peripheral surface. The V-phase terminal 40V is disposed on the outer peripheral surface. In FIG. 7, it is shown that the conductor layer in the wound state and the conductor layer outside thereof overlap, but the conductor layer and the conductor layer outside thereof may partially overlap or may not overlap.

[0040] FIG. 8 is an enlarged view of part VIII in FIG. 7 and shows an example of the terminal form. As shown in FIG. 8, conductor layers 100F and 100B of coils 20U, 20V, and 20W are formed on both sides of the flexible substrate 10, and insulating films 102F and 102B are formed on the conductor layers 100F and 100B of the coils 20U, 20V, and 20W. By forming the insulating films 102F and 102B, the conductor layers 100F and 100B are not exposed, and they are not contacted with adjacent conductor layers 100F and 100B or adjacent conductor layers 100F and 100B in the cross section when the coil substrate 2 is wound, so insulation is maintained. The insulating films 102F and 102B can be formed by printing a liquid resin. An example of the resin is polyimide. In FIG. 8, the insulating films 102F and 102B are formed so as to follow the conductor layers 100F and 100B, but they may also cover the upper surfaces of the conductor layers 100F and 100B and fill the space between the conductor layers 100F and 100B. The thickness of the insulating layers 102F and 102B is not particularly limited, but it is preferably formed to be about 1 μm or more and 30 μm or less. In FIG. 8, the conductor layers 100F and 100B are formed symmetrically with the flexible substrate 10 interposed therebetween, but the conductor layers 100F and 100B may partially overlap with the flexible substrate 10 interposed therebetween, or the conductor layers 100F and 100B may not overlap with the flexible substrate 10 interposed therebetween. Also, in FIG. 8, the cross-sectional shape of the conductor layers 100F and 100B is trapezoidal, but the cross-sectional shape of the conductor layers 100F and 100B may be a square or a rectangular quadrilateral. The cross-sectional shapes of the respective conductor layers 100F and 100B may be common, or the cross-sectional shapes of the conductor layers 100F and 100B may be different from each other.

[0041] At this time, the cross-section of the motor coil substrate 550 is composed of the flexible substrate 10, the conductor layers which are the wirings of each phase, and the insulating layers covering the conductor layers. At this time, the result of calculating the cross-sectional area of all the conductor layers in the cross-sectional area of the motor coil substrate 550 is the occupation ratio of the coil. At this time, the occupation ratio of the coil in the cross-section of the motor coil substrate 550 is 50% or more and 99% or less. It is ensured that the occupation ratio of the coil conductor is high. Therefore, when a motor is formed using the motor coil substrate 550 of the embodiment, high torque can be obtained. A motor with high performance can be obtained. At this time, the calculation method of the occupation ratio of the coil is Occupation ratio = (Sum of cross-sectional areas of conductor parts / Coil cross-sectional area) × 100.

[0042] FIG. 7 shows the outer peripheral surface OC and the inner peripheral surface IC of the motor coil substrate 550. In the embodiment, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.3 mm. When the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and equal to or less than 0.3 mm, the motor coil substrate 550 does not roll evenly on a flat place. Since the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and equal to or less than 0.3 mm, the adhesion strength with the yoke becomes high when forming the motor. A motor with stable performance can be obtained. Also, it is preferable that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm. Since the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and equal to or less than 0.2 mm, the adhesion strength with the yoke becomes high when forming the motor and it can be stabilized. Therefore, even when operated as a motor, there is no displacement of the motor coil substrate 550, and a motor with stable performance can be obtained.

[0043] The cylindricity of the outer peripheral surface OC is measured by a measurement method using a V-block. That is, the motor coil substrate 550 is placed on the V-block, rotated once, and the differences in the direction perpendicular to the axis are measured at five different positions, and the average value is calculated to measure the cylindricity of the outer peripheral surface OC.

[0044] In the cross-section of the motor coil substrate 550, the occupation ratio of the combined coils of coils 20U, 20V, and 20W is 50% or more and 99% or less. By using the motor coil substrate 550 with an occupation ratio of 50% or more and 99% or less, a high-torque motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. Note that the small motor in this specification is a motor with an outer diameter of 50 mm or less.

[0045] Also, it is preferable that the occupation ratio of the coils in the cross-section of the motor coil substrate 550 is 55% or more and 90% or less. By using the motor coil substrate 550 with an occupation ratio of the coils of 55% or more and 90% or less, a high-torque motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0046] Furthermore, it is more preferable that the occupation ratio of the coils in the cross-section of the motor coil substrate 550 is 60% or more and 80% or less. It is ensured that the occupation ratio of the coil conductors is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. Furthermore, even in a small motor, it is ensured that the occupation ratio of the coil conductors is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the torque can be improved, and a high-performance motor can be obtained.

[0047] The ratio of the wiring (i.e., the wiring of each of the coils 20U, 20V, and 20W) in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. By using the motor coil substrate 550 with a wiring ratio in the total weight of 80.0% or more and 99.9% or less, a high-torque motor can be obtained. At this time, the calculation method of the ratio of the wiring in the total weight of the motor coil substrate 550 is wiring ratio = (total weight of the conductor part / weight of the coil substrate) × 100.

[0048] Also, the ratio of the wiring to the total weight of the motor coil substrate 550 is preferably 85.0% or more and 96.0% or less. Since the wiring ratio is 85.0% or more and 96.0% or less, it is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. Furthermore, even in a small motor, it is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the torque can be improved, and a high-performance motor can be obtained.

[0049] The outer peripheral surface OC of the motor coil substrate 550 is formed of the flexible substrate 10, and the wirings of the coils 20U, 20V, and 20W are not exposed. That is, an insulating layer that covers the wiring is formed on the outermost periphery of the motor coil substrate 550. The outer peripheral surface OC of the motor coil substrate 550 is insulated from the outside.

[0050] When forming the motor coil substrate 550, the number of turns of the coil substrate 2 is arbitrary. The number of turns of the coil substrate 2 is preferably 2 or more and 10 or less. By setting the number of turns to 2 or more and 10 or less, the cylindricity of the outer peripheral surface OC of the formed motor coil substrate 550 becomes larger than 0.0 mm and 0.3 mm or less as described above. As a result, a decrease in motor performance can be suppressed.

[0051] The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less. In the motor coil substrate 550 according to the embodiment of the present invention, when a motor is formed using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil is 50% or more and 99% or less, When forming the motor, the adhesive strength with the yoke becomes high, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0052] It is preferable that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less. By using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil is 55% or more and 90% or less, the adhesive strength with the yoke becomes high during motor formation, and A high-torque motor can be obtained. A high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0053] Furthermore, it is preferable that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and 0.3 mm or less, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less,The occupation ratio of the coil conductor is ensured to be high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming the motor, the adhesion strength with the yoke becomes high, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, even in a small motor, the occupation ratio of the coil conductor is ensured to be high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the adhesion strength with the yoke becomes high when forming the motor, so that the torque can be improved and a high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, and it is more preferable that the occupancy ratio of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, and the occupancy ratio of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less, it is ensured that the occupancy ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming the motor, the adhesion strength with the yoke becomes high, and high torque can be obtained. A motor with high performance can be obtained. Furthermore, even in a small motor, it is ensured that the occupancy ratio of the coil conductor is high, when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the adhesion strength with the yoke becomes high when forming the motor, thereby stabilizing it. Therefore, even when operating as a motor, there is no displacement of the motor coil substrate 550, the torque can be improved, and a motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and it is more preferable that the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less, it is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming the motor, the adhesive strength with the yoke becomes high, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, even in a small motor, it is ensured that the occupation ratio of the coil conductor is high, when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, the adhesive strength with the yoke becomes high when forming the motor, and it is stabilized. Therefore, even when operating as a motor, there is no displacement of the motor coil substrate 550, the torque can be improved, and a high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0054] The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and it is more preferable that the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less, The occupation ratio of the coil conductor is ensured to be high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. When forming the motor, the adhesion strength with the yoke becomes high, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, even in a small motor, the occupation ratio of the coil conductor is ensured to be high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape, and the adhesion strength with the yoke becomes high when forming the motor, so as to stabilize it. Therefore, even when operating as a motor, there is no displacement of the motor coil substrate 550, the torque can be improved, and a high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved and a high-performance motor can be obtained.

[0055] The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.3 mm, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. When a motor is formed using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC is greater than 0.0 mm and less than or equal to 0.3 mm, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, The occupation ratio of the coil is increased, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved and a high-performance motor can be obtained.

[0056] In addition, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.3 mm, and the ratio of the wiring to the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. When a motor is formed using the motor coil substrate 550 whose cylindricity of the outer peripheral surface OC is greater than 0.0 mm and equal to or less than 0.3 mm, and the ratio of the wiring to the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, While increasing the wiring ratio, it becomes a predetermined cylindrical shape. As a result, the adhesive strength with the yoke during motor formation increases, the fill factor of the coil is increased, and high torque is obtained. A high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, and the ratio of the wiring to the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. When a motor is formed using the motor coil substrate 550 of the embodiment whose cylindricity of the outer peripheral surface OC is greater than 0.0 mm and equal to or less than 0.2 mm, and the ratio of the wiring to the total weight is 80.0% or more and 99.9% or less, while the ratio of the wiring is increased, a predetermined cylindrical shape is obtained. As a result, the adhesive strength with the yoke becomes higher during motor formation, the occupation ratio of the coil is increased, and high torque can be obtained. A motor with high performance can be obtained. Further, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained.

[0057] Furthermore, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, and the ratio of the wiring to the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. The motor coil substrate 550 of the embodiment has a cylindricity of the outer peripheral surface OC greater than 0.0 mm and equal to or less than 0.2 mm, and a ratio of the wiring to the total weight of 85.0% or more and 96.0% or less When a motor is formed using it, while increasing the wiring ratio and the fill factor of the coil, it becomes a predetermined cylindrical shape, and high torque is obtained. As a result, the adhesive strength with the yoke during motor formation increases, and it is stabilized. Therefore, even when operating as a motor, there is no displacement of the motor coil substrate 550, and a motor with stable performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0058] The fill factor of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. In the motor coil substrate 550 of the embodiment, by using a motor coil substrate in which the fill factor of the coil is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, the fill factor of the coil can be increased, and high torque can be obtained. A high-performance motor can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0059] It is preferable that the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. By using the motor coil substrate 550 in which the occupation ratio of the coil is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, the occupation ratio of the coil can be increased, and a high-torque motor can be obtained. A motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained.

[0060] Furthermore, it is preferable that the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. Since the occupation ratio of the coil is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, it is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, a predetermined cylindrical shape is obtained. High torque can be obtained. A motor with high performance can be obtained. Furthermore, in a small motor, it is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, a predetermined cylindrical shape is obtained, and the torque can be improved, and a motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained.

[0061] The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. In the motor coil substrate 550 of the embodiment, when a motor is formed using a motor coil substrate in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, The occupation ratio of the coil can be increased, and high torque can be obtained. The adhesive strength with the yoke becomes high during motor formation, and high torque can be obtained. A motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained. Also, it is preferable that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. By using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, the occupancy ratio of the coil can be increased, a predetermined cylindrical shape can be obtained, and a high-torque motor can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 80.0% or more and 99.0% or less. By using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, the occupancy ratio of the coil is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, the occupancy ratio of the coil can be increased, a predetermined cylindrical shape can be obtained, and a high-torque motor can be obtained. Therefore, even when it is operated as a motor, a motor with stable performance can be obtained. Further, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.2 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less. In the motor coil substrate 550 of the embodiment, when a motor is formed using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.2 mm, the occupancy ratio of the coil is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 80.0% or more and 99.9% or less, the occupancy ratio of the coil can be increased, and high torque can be obtained. The adhesive strength with the yoke becomes high during motor formation, and high torque can be obtained. A high-performance motor can be obtained. Further, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. Also, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 80.0% or more and 99.9% or less. By using the motor coil substrate 550 with the cylindricity of the outer peripheral surface OC greater than 0.0 mm and less than or equal to 0.2 mm, the occupancy ratio of the coil being 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 being 80.0% or more and 99.9% or less, the occupancy ratio of the coil can be increased, resulting in a predetermined cylindrical shape and a high-torque motor. Therefore, a motor with stable performance can be obtained even when it is operated as a motor. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 80.0% or more and 99.0% or less. By using the motor coil substrate 550 with the cylindricity of the outer peripheral surface OC greater than 0.0 mm and less than or equal to 0.2 mm, the occupancy ratio of the coil being 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 being 80.0% or more and 99.9% or less, the occupancy ratio of the coil can be increased, resulting in a predetermined cylindrical shape and a high-torque motor. Therefore, a motor with stable performance can be obtained even when it is operated as a motor. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 85.0% or more and 96.0% or less. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and in the motor coil substrate 550, the occupancy ratio of the coil is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. When a motor is formed using the motor coil substrate 550, the occupancy ratio of the coil can be increased, and high torque can be obtained. When the motor is formed, the adhesive strength with the yoke is increased, and high torque can be obtained. A motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a motor with high performance can be obtained.

[0062] Also, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 85.0% or more and 96.0% or less. By using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, The occupation ratio of the coil can be increased to form a predetermined cylindrical shape, and a high-torque motor can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0063] In addition, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil in the cross-section of the motor coil substrate 550 is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is preferably 85.0% or more and 96.0% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and not more than 0.3 mm, and the occupancy ratio of the coil is 60% or more and 80% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, It is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. As a result, the adhesion strength with the yoke becomes high during motor formation. Therefore, even when operated as a motor, a motor with stable performance can be obtained. When the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained. The cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. In the motor coil substrate 550 of the embodiment, when a motor is formed using a motor coil substrate in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil is 50% or more and 99% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, the occupation ratio of the coil can be increased and high torque can be obtained. When the motor is formed, the adhesive strength with the yoke becomes high and high torque can be obtained. A motor with high performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved and a motor with high performance can be obtained. Also, it is preferable that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil in the cross section of the motor coil substrate 550 is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less. By using the motor coil substrate 550 in which the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and less than or equal to 0.2 mm, and the occupation ratio of the coil is 55% or more and 90% or less, and the ratio of the wiring in the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, the occupation ratio of the coil can be increased, a predetermined cylindrical shape can be obtained, and a high-torque motor can be obtained. Therefore, even when operated as a motor, a motor with stable performance can be obtained. Furthermore, when the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved and a motor with high performance can be obtained.

[0064] Note that the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, the occupancy ratio of the coil in the cross section of the motor coil substrate 550 is 60% or more and 80% or less, and the ratio of the wiring to the total weight of the motor coil substrate 550 is preferably 85.0% or more and 96.0% or less. Since the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 is greater than 0.0 mm and equal to or less than 0.2 mm, the occupancy ratio of the coil is 60% or more and 80% or less, and the ratio of the wiring to the total weight of the motor coil substrate 550 is 85.0% or more and 96.0% or less, It is ensured that the occupation ratio of the coil conductor is high, and when wound in a cylindrical shape, it becomes a predetermined cylindrical shape. High torque can be obtained. As a result, the adhesion strength with the yoke becomes high during motor formation and is stabilized. Therefore, even when operated as a motor, there is no displacement of the motor coil substrate 550, and a motor with stable performance can be obtained. When the motor coil substrate 550 of the embodiment is applied to a small motor, the torque can be improved, and a high-performance motor can be obtained.

[0065] The motor coil substrate 550 of the embodiment is used for a slotless motor. In other examples, the motor coil substrate 550 may be used for motors other than slotless motors.

[0066] The diameter of the outer peripheral surface OC (outer diameter of the cross section) of the motor coil substrate 550 is 50 mm or less. Preferably, the diameter of the outer peripheral surface OC (outer diameter of the cross section) of the motor coil substrate 550 is 30 mm or less. By forming a small motor using the motor coil substrate 550 with a diameter of 50 mm or less, a decrease in motor performance can be effectively suppressed. The diameter of the outer peripheral surface OC of the motor coil substrate 550 is it is measured by vernier caliper. In addition, in the embodiment shown in FIG. 1, the occupation ratio of the coil in the cross-sectional area of the motor coil substrate 550 is 70%. The ratio of the wiring in the total weight of the motor coil substrate 550 is 93%. The cylindricity of the outer peripheral surface OC is 0.1 mm. The diameter of the outer peripheral surface OC (outer diameter of the cross section) of the motor coil substrate 550 is 16 mm.

[0067] FIG. 9 is a cross-sectional view schematically showing a motor 600 using the motor coil substrate 550 (FIGS. 6 to 8) of the embodiment. The motor 600 is formed by arranging the motor coil substrate 550 inside the yoke 560 and arranging a rotating shaft 580 and a magnet 570 fixed to the rotating shaft 580 inside the motor coil substrate 550. The motor 600 of the embodiment is a slotless motor.

[0068] As described above, the configurations of the coil substrate 2 (FIGS. 1 to 5), the motor coil substrate 550 (FIGS. 6 to 8), and the motor 600 (FIG. 9) of the embodiment have been described. As described above, the cylindricity of the outer peripheral surface OC of the motor coil substrate 550 of the embodiment is greater than 0.0 mm and 0.3 mm or less. Therefore, when the motor 600 is formed using the motor coil substrate 550, the adhesion strength between the outer peripheral surface OC of the motor coil substrate 550 and the yoke 560 is higher than when the cylindricity of the outer peripheral surface is 0.0 mm. Even when a reaction acts due to the rotation of the rotating shaft 580 and the magnet 570, the motor coil substrate 550 is less likely to be peeled off from the yoke 560. In particular, when the small motor 600 using the motor coil substrate 550 of the embodiment is manufactured, since a wider contact area between the outer peripheral surface OC of the motor coil substrate 550 and the yoke 560 is ensured, the adhesion strength becomes higher. Therefore, when the motor 600 is formed using the motor coil substrate 550 of the embodiment, stable motor performance can be obtained.

[0069] [Modification Example of Embodiment] FIG. 10 and FIG. 11 show a modification example of the embodiment. FIG. 10 is a plan view showing the coil substrate 102 of the modification example. FIG. 11 is a bottom view showing the coil substrate 102 of the modification example. As shown in FIGS. 10 and 11, in the modification example, the arrangement of the wirings of the coils 31U, 31V, and 31W that constitute the U-phase coil 20U, the V-phase coil 20V, and the W-phase coil 20W is different from that of the embodiment.

[0070] In addition, in FIGS. 10 and 11, only the coils 31U, 31V, and 31W are shown as the coils that constitute the U-phase coil 20U, the V-phase coil 20V, and the W-phase coil 20W. However, in reality, the U-phase coil 20U, the V-phase coil 20V, and the W-phase coil 20W may be formed by a plurality of coils including the coils 31U, 31V, and 31W. Also, in FIGS. 10 and 11, the illustration of the U-phase terminal 40U, the V-phase terminal 40V, the W-phase terminal 40W, the coil connection lines 50U, 50V, 50W, and the plurality of phase connection lines 60U, 60V, and the return line 70W is omitted.

[0071] The coil 31U that constitutes the U-phase coil 20U is composed of a coil-shaped first wiring 30UF (FIG. 10) provided on the first surface 10F and a coil-shaped second wiring 30UB (FIG. 11) provided on the second surface 10B. The first wiring 30UF and the second wiring 30UB are electrically connected via a via conductor 81U that penetrates the flexible substrate 10. Similarly, the coil 20V that constitutes the V-phase is composed of the first wiring 30VF and the second wiring 30VB. The first wiring 30VF and the second wiring 30VB are electrically connected via a via conductor 81V. The coil 20W that constitutes the W-phase is composed of the first wiring 30WF and the second wiring 30WB. The first wiring 30WF and the second wiring 30WB are electrically connected via a via conductor 81W.

[0072] As shown in FIG. 10, the first wiring 30UF is formed in a clockwise spiral shape (hexagonal spiral shape) from the outer periphery toward the inner periphery. The via conductor 81U is formed at the inner peripheral side end of the first wiring 30UF. As shown in FIG. 11, the second wiring 30UB is formed in a counterclockwise spiral shape (hexagonal spiral shape) from the outer periphery toward the inner periphery. The via conductor 81U is formed at the inner peripheral side end of the second wiring 30UB. The first wiring 30UF and the second wiring 30UB are formed in spiral shapes with the same winding direction when viewed from the same plane. The first wiring 30UF and the second wiring 30UB overlap via the flexible substrate 10. The first wiring 30UF and the second wiring 30UB function as one coil 31U electrically connected in series.

[0073] The first wiring 30VF and the second wiring 30VB, and the first wiring 30WF and the second wiring 30WB have the same relationship as the above-described first wiring 30UF and second wiring 30UB. The first wiring 30VF and the second wiring 30VB are formed in spiral shapes with the same winding direction when viewed from the same plane. The first wiring 30VF and the second wiring 30VB overlap via the flexible substrate 10. The first wiring 30VF and the second wiring 30VB function as one coil 31V electrically connected in series. The first wiring 30WF and the second wiring 30WB are formed in spiral shapes with the same winding direction when viewed from the same plane. The first wiring 30WF and the second wiring 30WB overlap via the flexible substrate 10. The first wiring 30WF and the second wiring 30WB function as one coil 31W electrically connected in series.

[0074] Although not shown, the first surface 10F and the first wirings 30UF, 30VF, 30WF are covered with a resin insulating layer. Similarly, the second surface 10B and the second wirings 30UB, 30VB, 30WB are covered with a resin insulating layer. The small motor in this specification is a motor with an outer diameter of 50 mm or less.

[0075] As shown in FIGS. 10 and 11, in the modified example, the wirings of the respective coils 20U, 20V, and 20W are arranged in a hexagonal shape. In other examples, the wirings of the respective coils 20U, 20V, and 20W may be arranged in any shape such as circular (true circle, ellipse), triangular, quadrangular (square, rectangle, rhombus), pentagonal, or polygonal with seven or more sides. Also, the arrangement shapes of the wirings of all the coils are not limited to being the same, and the arrangement shapes of the wirings may be different between the coils.

[0076] The coil substrate 102 of the modified example is manufactured by an arbitrary method. For example, the coil substrate 2 may be formed by a tenting method using a flexible substrate having a conductor layer (metal foil) as a starting material. In other examples, the coil substrate 102 may be obtained by forming a metal layer on a flexible substrate by printing or a dispensing method. In still other examples, the coil substrate 102 may be obtained by forming a flexible material and a metal layer with a 3D printer.

[0077] By winding the coil substrate 102 of the modified example in a cylindrical shape, a motor coil substrate 550 for a motor is formed (see FIGS. 6 to 8). The motor coil substrate 550 formed by the coil substrate 102 of the modified example also has the same characteristics as the motor coil substrate 550 of the embodiment. Therefore, the motor coil substrate 550 of the modified example can also exhibit the same effects as the motor coil substrate 550 of the embodiment. In the modified example shown in FIGS. 10 and 11, the occupation ratio of the coils in the cross-sectional area of the motor coil substrate 550 is 65%. The ratio of the wiring in the total weight of the motor coil substrate 550 is 91%. The cylindricity of the outer peripheral surface OC (see FIG. 7) is 0.1 mm. The diameter of the outer peripheral surface OC (outer diameter of the cross section) of the motor coil substrate 550 is 16 mm.

Explanation of Reference Numerals

[0078] 2, 102: Coil substrate 10: Flexible substrate 20U: U-phase coil 20V: V-phase coil 20W: W-phase coil 550: Motor coil substrate 560: Yoke 570: Magnet 580: Rotation Axis 600: Motor IC: Inner Peripheral Surface OC: Outer Peripheral Surface

Claims

1. a flexible substrate having a first surface and a second surface opposite the first surface; a plurality of coils formed by wiring provided on the first surface and the second surface; A coil substrate for a motor, the coil substrate being formed into a cylindrical shape by being wound in a circumferential direction around an axis extending in a direction perpendicular to the longitudinal direction of the flexible substrate, the axis being a starting point of a first end of the flexible substrate in a longitudinal direction, The cylindricity of the outer peripheral surface is greater than 0.0 mm and is not more than 0.3 mm.

2. 2. The motor coil substrate according to claim 1, wherein the cylindricity of an outer peripheral surface of said motor coil substrate is greater than 0.0 mm and is not more than 0.2 mm.

3. 2. The motor coil substrate according to claim 1, wherein the outer peripheral surface is formed of the flexible substrate, and the wiring is not exposed.

4. A coil substrate for a motor according to claim 1, wherein the coil has a first wiring of half a turn formed on the first surface, a second wiring of half a turn formed on the second surface, and a via conductor connecting the first wiring and the second wiring.

5. A coil substrate for a motor according to claim 1, wherein the coil has a first wiring formed in a spiral shape on the first surface, a second wiring formed in a spiral shape on the second surface, and a via conductor connecting the first wiring and the second wiring.

6. 2. The motor coil substrate according to claim 1, wherein the motor coil substrate is used in a slotless motor.

7. 2. The motor coil substrate according to claim 1, wherein the outer diameter of the cross section is 50 mm or less.

8. A motor coil substrate as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil substrate is greater than 0.0 mm and less than 0.3 mm, and the occupancy rate of the coil in the cross section of the motor coil substrate is greater than 50% and less than 99%.

9. A motor coil substrate as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil substrate is greater than 0.0 mm and less than 0.2 mm, and the occupancy rate of the coil in the cross section of the motor coil substrate is greater than 60% and less than 80%.

10. A motor coil substrate as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil substrate is greater than 0.0 mm and less than 0.3 mm, and the proportion of the wiring in the total weight of the motor coil substrate is greater than 80.0% and less than 99.9%.

11. A motor coil board as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil board is greater than 0.0 mm and less than 0.2 mm, and the proportion of the wiring in the total weight of the motor coil board is greater than 85.0% and less than 96.0%.

12. A motor coil board as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil board is greater than 0.0 mm and less than 0.3 mm, and the occupancy rate of the coil in the cross section of the motor coil board is greater than 50% and less than 99%, and the proportion of the wiring in the total weight of the motor coil board is greater than 80.0% and less than 99.9%.

13. A motor coil board as claimed in claim 1, wherein the cylindricity of the outer surface of the motor coil board is greater than 0.0 mm and less than 0.2 mm, and the occupancy rate of the coil in the cross section of the motor coil board is greater than 60% and less than 80%, and the proportion of the wiring in the total weight of the motor coil board is greater than 85.0% and less than 96.0%.

14. A motor coil substrate as claimed in claim 1, wherein an insulating layer covering the wiring is formed on the outermost periphery of the motor coil substrate.

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