JP2020025417A - motor - Google Patents

Abstract

To make it possible to connect a wire to a wiring board using no pin and facilitate operation of connecting the wire to the wiring board.SOLUTION: A motor 1 supplies a drive current to a coil 26 of a stator 23 via a wiring board 8. A winding 261 of the coil 26 is soldered to a land 82 in a state of being locked to a locking portion 81 of the wiring board 8. The locking portion 81 includes a first through groove 811 extending from an outer peripheral end of the wiring board 8 toward an inner peripheral side and a second through groove 812 connected to an end of an inner peripheral side of the first through groove 811. At least part of the second through groove 812 extends in a direction toward the outer peripheral side of the wiring board 8 toward an opposite side of a connection position P connected to the first through groove 811. The land 82 is provided at an edge of a tip side of the second through groove 812 and is connected to a conductive portion 86 provided on an inner surface of the second through groove 812. The winding 261 is bent toward a tip side of the second through hole 812 and being soldered to the land 82.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a motor that supplies power to a coil via a wiring board.

  In a motor in which a stator and a rotor are housed in a motor case, a coil winding wound around salient poles of a stator core and a lead wire for power supply are connected to a wiring board, and power is supplied to the coil via a wiring pattern on the wiring board. There is something to do. Patent Document 1 discloses this type of motor. In the motor of Patent Literature 1, a pin terminal is passed through a hole in a wiring board, and a winding is connected to the wiring board by winding the winding around the pin terminal.

  A high-output motor or a motor with a low applied voltage has a large winding diameter, so that the winding cannot be entangled with the pin terminal. Therefore, a structure in which the winding is connected to the wiring board using the pin terminals cannot be adopted. Patent Document 2 discloses a structure in which a winding is connected to a wiring board without using pin terminals. In the motor of Patent Document 2, a groove-shaped drive coil insertion portion is provided at the outer peripheral end of the wiring board, and the winding is soldered to the wiring board through the groove (drive coil insertion portion). The groove extends linearly in the radial direction, and the winding extends from the groove to the land on the inner peripheral side and is soldered to the land.

Japanese Patent No. 3804398 JP-A-9-322497

  In the motor of Patent Document 2, a winding drawn from a coil is drawn out in an axial direction of the stator at an outer peripheral end portion of the stator, and is passed through a groove (a drive coil insertion portion) of a wiring board. When connecting the windings to the wiring board, first, the windings drawn out from the outer peripheral end of the stator to the side where the wiring board is arranged are turned down to the outer periphery to secure a space for disposing the wiring board. . Then, after disposing the wiring board, the winding is raised, passed through the groove, and soldered.

  When the windings are connected by such a method, the windings are inclined to the outer peripheral side, so that there is a tendency to return to the shape of the windings. Therefore, even if the winding is raised and inserted into the groove, the winding tends to return to the outer peripheral side, and the winding is likely to come off the groove. In particular, when the winding diameter is large, the stress that tends to return to the collapsed shape is strong, so that the winding is likely to come off the groove. Therefore, the winding must be held down and soldered, and workability is poor. In addition, there is a possibility that the winding may come off the land after soldering.

  In view of the above problems, an object of the present invention is to provide a motor that can connect a winding to a wiring board without using pins and that is easy to connect the winding to the wiring board. It is in.

In order to solve the above problems, the present invention provides a stator core having a plurality of salient poles, a stator having a coil wound around each salient pole via an insulator, and a drive current supplied to the coil flows. A wiring board for connecting a power supply line and a winding of the coil, wherein the wiring board has a locking portion for locking the winding, and a land to which the winding is soldered. Wherein the locking portion is provided with a first notch cut from an outer peripheral end toward an inner peripheral side of the wiring board.
A second through-groove connected to an inner peripheral end of the first through-groove; at least a part of the second through-groove is opposite to a side connected to the first through-groove; It extends in the direction toward the outer peripheral side of the wiring board as it goes to the side.

  According to the present invention, the winding is soldered to the land while being locked to the locking portion of the wiring board. Therefore, since there is no need to wrap the winding around the terminal pin, even if the winding has a large diameter, the coil can be connected to the power supply line using the wiring board. The locking portion includes a first through groove extending from the outer peripheral end to the inner peripheral side of the wiring board, and a second through groove connected to the inner peripheral end of the first through groove. At least a portion extends in a direction toward the outer peripheral side of the wiring board as going to a side opposite to a side connected to the first through groove. As described above, if at least a part of the second through groove is shaped toward the outer peripheral side of the wiring board, it is possible to prevent the winding from coming off from the locking portion by inserting the winding into the second through groove. That is, when the winding has a tendency to fall to the outer peripheral side, the winding is urged to the opposite side to the position connected to the first through groove, so that the winding is applied to the first through groove. Return is suppressed. Further, even when the winding does not have a tendency to fall to the outer peripheral side, the circumferential movement of the winding in the second through groove is suppressed. Therefore, since the winding is hard to move in the second through groove, the return of the winding to the first through groove is suppressed. Therefore, since there is little possibility that the winding may come off from the locking portion, the work of soldering is easy, and the work of connecting the winding to the wiring board is easy. For example, after a plurality of windings are locked to the locking portion, soldering can be performed collectively. Therefore, the plurality of windings can be efficiently soldered.

  In the present invention, it is preferable that the land is provided on an edge of the second through groove and is connected to a conductive portion provided on an inner surface of the second through groove. In this case, the winding can be easily brought into contact with the land by defeating the winding. In addition, the pattern provided on each layer of the wiring board and the winding can be electrically connected via the conductive portion. Therefore, the allowable current can be increased. Further, since the winding can be soldered not only to the land but also to the inner surface of the second through groove, the fixing strength of the winding can be improved.

  In the present invention, it is preferable that the wiring board includes a through hole formed in a region surrounding the locking portion. By doing so, the pattern of each layer in the wiring board and the winding can be electrically connected via the through hole. Therefore, the allowable current can be increased.

  In the present invention, it is preferable that a position where the first through groove and the second through groove are connected is a position overlapping with a drawing position at which the winding is drawn from the coil when viewed from an axial direction of the stator. With this configuration, the winding can be easily inserted into the second through groove. Therefore, it is easy to hold the winding in the second through groove. Further, it is difficult for the winding to return to the entrance side of the first through groove. Therefore, the winding is less likely to come off from the locking portion. Therefore, the work of soldering is easy, and the work of connecting the winding to the wiring board is easy.

  In the present invention, the insulator includes a wall portion disposed on an outer peripheral side of the coil, the wall portion includes a concave groove in which the winding drawn out to an outer peripheral side of the wall portion is disposed, It is preferable that the groove overlaps with the first through groove when viewed from the axial direction. By doing so, it is possible to avoid interference between the insulator and the winding when laying the wiring board by tilting the winding to the outer peripheral side. Further, since the concave groove and the first through groove overlap when viewed from the axial direction, the winding can be easily inserted into the first through groove.

In the present invention, the winding is tilted to a tip end side of the second through groove, extends in the extending direction of the second through groove in the second through groove, and at least a part of the land is It is preferable that the second through-groove be provided on the tip side. In this case, since the winding is disposed in the second through groove in a state inclined with respect to the thickness direction of the wiring board, it is not necessary to bend the winding at a substantially right angle in order to bring the winding into contact with the land. Instead, it may be bent at an obtuse angle. Accordingly, since the stress applied to the winding is small, the soldered winding is not easily detached. Further, when the conductive portion is provided on the inner surface of the second through groove, the contact area with the conductive portion can be increased by tilting the winding in the second through groove. Furthermore, since the winding extends in the direction in which the second through groove extends in the second through groove, the range in which the second through groove is closed by the winding is large. Therefore, there is little possibility that the solder drips from the second through groove toward the stator.

  In the present invention, the wiring board is provided with a plurality of winding connection portions provided with the locking portions and the lands, and in each of the winding connection portions, the second through groove is positioned relative to the first through groove. The first through-groove of the winding connection portion adjacent on one side in the circumferential direction and the first through-groove of the winding connection portion adjacent on the other side in the circumferential direction. It is preferable that the far side is the side where the first through groove is located. This makes it possible to increase the distance between lands that are adjacent in the circumferential direction. Therefore, when the windings arranged in the second through groove are soldered to the lands, not only the lands of the winding connection portions but also the solders protrude to the lands of the adjacent winding connection portions and the adjacent winding connection portions. Can be avoided.

  According to the present invention, since there is no need to wrap a winding around the terminal pin, even if the winding diameter is large, the coil can be connected to the power supply line using the wiring board. In addition, since at least a part of the second through groove has a shape directed toward the outer peripheral side of the wiring board, it is possible to prevent the winding from coming off the locking portion by inserting the winding into the second through groove. That is, when the winding has a tendency to fall to the outer peripheral side, the winding is urged to the opposite side to the position connected to the first through groove, so that the winding is applied to the first through groove. Return is suppressed. Further, even when the winding does not have a tendency to fall to the outer peripheral side, the circumferential movement of the winding in the second through groove is suppressed. Therefore, the winding is hard to move in the second groove, so that the winding is prevented from returning to the first through groove. Therefore, since there is little possibility that the winding may come off from the locking portion, the work of soldering is easy, and the work of connecting the winding to the wiring board is easy.

FIG. 2 is a sectional view of a motor according to the present invention. It is a perspective view of a stator and a wiring board. It is a top view of a stator. It is a top view of a wiring board. It is a perspective view of a winding connection part. It is sectional drawing of a 2nd penetration groove and a winding. It is explanatory drawing which shows the modification of a locking part.

(overall structure)
Hereinafter, an embodiment of a motor to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a sectional view of a motor 1 according to the present invention. In this specification, of the one side and the other side in the axial direction L of the motor 1, the side on which the output shaft 100 of the motor 1 protrudes is referred to as an output side L1, and the side opposite to the side on which the output shaft 100 protrudes is referred to as the output side L1. Let it be the opposite output side L2. The output shaft 100 of the motor 1 is provided at an end of the output side L1 of the rotating shaft 10 extending in the axial direction L at the center of the motor 1.

In the motor 1, the motor unit 2, the electromagnetic brake 3, and the encoder 4 are arranged in this order from the output side L1 of the rotating shaft 10 to the opposite output side L2. The motor unit 2 and the electromagnetic brake 3 are housed in a motor case 5. The encoder 4 is housed inside an encoder cover 6 attached to an end face of the motor case 5 on the non-output side L2. The motor to which the present invention is applied is not limited to the motor 1 including the motor unit 2, the electromagnetic brake 3, and the encoder 4, and may not include the electromagnetic brake 3 and the encoder 4.

  The motor case 5 is made of a metal such as aluminum. The motor case 5 includes a rectangular cylindrical core holder 51 surrounding the outer peripheral side of the motor unit 2, a thick bearing holder 52 attached to an output end of the core holder 51, an outer peripheral side of the electromagnetic brake 3 and a non-output side. A brake case 53 surrounding L2 is provided. The rotating shaft 10 is rotatable by an output bearing 11 held in a recess formed in the center of the bearing holder 52 and an opposite output bearing 12 held in a recess formed in the center of the bottom of the brake case 53. Supported. The output side bearing 11 and the non-output side bearing 12 are ball bearings in which rolling balls are held between an inner ring and an outer ring. The brake case 53 includes a thick bottom portion 54 that holds the non-output side bearing 12, and a cylindrical portion 55 that rises from the outer peripheral edge of the bottom portion 54 toward the core holder 51.

  The rotating shaft 10 includes a motor-side rotating shaft 13 having an output shaft 100 protruding from the bearing holder 52 to the output side L1, and an encoder-side rotating shaft 14 fixed to an end of the motor-side rotating shaft 13 opposite the output side L2. Prepare. The encoder-side rotary shaft 14 projects from the bottom 54 of the brake case 53 to the inside of the encoder cover 6. The motor-side rotating shaft 13 is made of a magnetic material, and the encoder-side rotating shaft 14 is made of a non-magnetic material. The motor-side rotating shaft 13 and the encoder-side rotating shaft 14 may be integrally formed of the same material.

  The motor unit 2 includes a rotor 22 having a magnet 21 fixed to the outer peripheral surface of the motor-side rotating shaft 13, and a cylindrical stator 23 surrounding the outer peripheral side of the rotor 22. The stator 23 includes a stator core 24 composed of a laminated core, and a coil 26 wound around each of a plurality of salient poles 241 provided on the stator core 24 via an insulator 25. On the non-output side L2 of the stator 23, the wiring board 8 to which the winding of the coil 26 is connected is arranged. To the wiring board 8, a lead wire 27 routed from the wiring take-out portion 56 formed on the motor case 5 to the inside of the motor case 5 is connected. The lead wire 27 is a power supply line, and a drive current is supplied from the lead wire 27 to the coil 26 via the wiring board 8.

  The encoder 4 is a magnetic encoder, and is provided with an encoder magnet 42 fixed to a tip of the encoder-side rotating shaft 14 via a magnet holder 41, and a magneto-sensitive element such as an MR element opposed to the encoder magnet 42 on the non-output side L2. An element 43 is provided. The encoder magnet 42 has one N pole and one S pole magnetized on a magnetized surface facing the magnetic sensing element 43. The sensor board 44 on which the magnetic sensing element 43 is mounted is fixed to the bottom 54 of the brake case 53 via a board holder 45. Note that an optical encoder can be used instead of the magnetic encoder.

  The electromagnetic brake 3 includes an annular friction plate 31 that rotates integrally with the motor-side rotating shaft 13, an annular armature 32 that faces the friction plate 31 on the non-output side L2, and a friction plate 31 that faces the friction plate 31 on the output side L1. An annular plate 33 is provided, and a cylindrical solenoid 34 is disposed on the non-output side L2 of the armature 32. The solenoid 34 is fixed to the brake case 53 by bolts. The power supply lead wire 35 for the solenoid 34 is drawn out of the motor case 5 from the wiring take-out portion 56 together with the lead wire 27 connected to the motor portion 2. The wiring take-out portion 56 includes a notch 561 in which the edge of the non-output side L2 of the core holder 51 is cut out on the output side L1, and a holder 562 fixed to the outer peripheral surface of the core holder 51 so as to cover the notch 561.

The electromagnetic brake 3 includes a torque spring (not shown) for urging the armature 32 toward the friction plate 31. When the solenoid 34 is not energized (when not energized), the friction plate 31 is connected to the armature 32 and the plate 3 by a torque spring.
3, a rotational load is applied to the motor-side rotary shaft 13 by frictional force, and a braking force is generated. Further, when the solenoid 34 is energized (excited), the armature 32 is attracted to the solenoid 34 against the torque spring, so that a gap is generated between the armature 32 and the friction plate 31. Therefore, no rotational load due to friction is applied to the motor-side rotating shaft 13, so that no braking force is applied.

(Stator)
FIG. 2 is a perspective view of the stator 23 and the wiring board 8, and FIG. 3 is a plan view of the stator 23. The stator 23 has twelve salient poles 241 (see FIG. 1), and the number N of slots in which the coils 26 are arranged is twelve. The magnet 21 of the rotor 22 is an eight-pole magnet in which the outer peripheral surface is divided into eight poles and N and S poles are alternately magnetized in the circumferential direction. That is, the motor section 2 of this embodiment has eight poles and twelve slots. The number of slots of the stator 23 and the number of magnetized poles of the magnet 21 may be other than 8 poles and 12 slots. For example, it may have six poles and nine slots or four poles and six slots.

  Flanges are formed at both ends in the radial direction of the insulator 25 attached to each salient pole 241 of the stator core 24. As shown in FIG. 1 and FIG. 2, the flange disposed outside the coil 26 in the radial direction includes a non-output side flange 251 that covers an end surface of the stator core 24 on the non-output side L2, and an output side L1 of the stator core 24. And an output-side flange portion 252 that covers the end surface of the output side. In this embodiment, since the number of the salient poles 241 and the insulators 25 around which the coil 26 is wound is 12, the 12 non-output-side flange portions 251 are annularly arranged.

  The motor unit 2 is an AC servomotor, and the stator 23 includes a three-phase coil 26. As shown in FIG. 2, four of the twelve coils 26 are U-phase coils 26U, four of the remaining eight are V-phase coils 26V, and the remaining four are W-phase coils. 26W. The U-phase coil 26U, the V-phase coil 26V, and the W-phase coil 26W are arranged in this order in the circumferential direction. The arrangement order of the U-phase, V-phase, and W-phase is not limited to such an order, and may be another arrangement order.

  The ends of the two windings 261 on the winding start side and the winding end side are pulled out from each coil 26 and connected to the wiring board 8. The winding 261 is drawn out from the outer peripheral end of the coil 26 in the axial direction L. As shown in FIG. 2, the terminal portion of the winding 261 is pulled out from the radially inner side of the non-output side flange portion 251 to the other side L2 in the axial direction L. The non-output side flange portion 251 includes a wall portion 253 that rises from the radially inner edge to the non-output side L2. In the wall portion 253, a concave groove 254 recessed toward the output side L1 is formed at two locations separated in the circumferential direction. As shown in FIG. 3, the two concave grooves 254 are located at the same distance from a center line Q passing through the circumferential center of the non-output side flange portion 251. The center line Q is a straight line passing through the center in the circumferential direction of the coil 26 and passing through the center in the radial direction of the stator 23. In FIG. 3, the center line of the coil 26 is shown only in one of the 24 coils 26 (26U, 26V, 26W), and the other is not shown.

  In this embodiment, the circumferential positions of the two concave grooves 254 provided on each wall 253 are substantially the same as the pull-out position R from which the terminal portions of the two windings 261 on the winding start side and the winding end side are pulled out. Matches. Therefore, as shown by the broken line in FIG. 3, the two windings 261 on the winding start side and the winding end side can be arranged in the concave groove 254 and fall to the outer peripheral side. Note that FIG. 3 shows only four windings 261 turned to the outer peripheral side. However, when connecting the wiring board 8 and the windings 261, all 24 windings 261 are similarly connected to the outer peripheral side. Flip to the side.

(Wiring board)
FIG. 4 is a plan view of the wiring board 8. As shown in FIGS. 2 and 4, the wiring board 8 is annular. The wiring board 8 is positioned in the axial direction L by abutting on the wall 253 of the non-output side flange 251 of the insulator 25. In the present embodiment, as described above, the winding 261 drawn in the axial direction L from the stator 23 is folded down to the outer peripheral side, so that a space for disposing the wiring board 8 on the non-output side L2 of the stator 23 can be secured. . Thereby, interference between the winding 261 and the wiring board 8 can be avoided.

  The wiring board 8 includes a winding connection portion 80 to which the winding 261 of the coil 26 is connected. As described above, in the present embodiment, the number of coils 26 is 12, and therefore, twelve sets of two windings 261 of the terminal part on the winding start side and the terminal part on the winding end side are drawn out. Accordingly, 24 windings 261 are pulled out from the stator 23, and the winding connection portions 80 are provided at 24 locations. The winding connection part 80 is provided on the outer peripheral edge of the wiring board 8. Each winding connection portion 80 includes a locking portion 81 formed on the outer peripheral edge of the wiring board 8 and a land 82 to which the winding 261 locked by the locking portion 81 is soldered.

  As shown in FIG. 4, a plurality of through holes 83 are formed on the outer peripheral edge of the wiring board 8 in a region surrounding each locking portion 81. Also, lands 84 for connecting the power supply lead wires 27 are formed at three places on the board surface of the wiring board 8. The core wire of the lead wire 27 is soldered to each of the three lands 84. Each land 84 is arranged on a wiring pattern 85 for connection formed on the substrate surface of the wiring board 8 and is connected to the wiring pattern 85 for connection.

  The wiring board 8 is a four-layer board in which four wiring layers are stacked via an insulating layer. Three of the four layers are a U-phase wiring layer in which a U-phase wiring pattern to which the U-phase coil 26U is connected and a V-phase wiring in which a V-phase wiring pattern to which the V-phase coil 26V is connected are formed. This is a W-phase wiring layer in which a layer and a W-phase wiring pattern to which the W-phase coil 26W is connected are formed. Another layer is a surface layer on which lands 84 and wiring patterns 85 for connection are formed.

  FIG. 4 is a plan view of the wiring board 8 as viewed from the surface layer side. Part of the through hole 83 is arranged in a region where the connection wiring pattern 85 is formed. Therefore, the pattern of each wiring layer and the pattern of the surface layer are electrically connected via the conductive portion formed on the inner surface of the through hole 83. Further, a part of the winding connection portion 80 is disposed in a region where the connection wiring pattern 85 is formed. Therefore, by connecting the winding 261 of the coil 26 to the winding connection portion 80, the three-phase coil 26 is connected via the through hole 83 and the connection wiring pattern 85, and A drive current is supplied to the three-phase coil 26 from the power supply lead wire 27 via the land 84.

  FIG. 5 is a perspective view of the winding connection portion 80 and is a partially enlarged view of the wiring board 8. The locking part 81 of each winding connection part 80 is a groove-shaped notch penetrating the wiring board 8. The locking portion 81 includes a first through groove 811 extending from the outer peripheral end of the wiring board 8 to the inner peripheral side, and a second through groove 812 connected to the inner peripheral end of the first through groove 811. The first through groove 811 linearly extends toward the inner peripheral side of the wiring board 8. The second through groove 812 is connected to the first through groove 811 at an acute angle. The second through-groove 812 extends in the direction toward the outer peripheral side of the wiring board 8 toward the side opposite to the connection position P, which is the position where the first through-groove 811 and the second through-groove 812 are connected. In other words, the second through groove 812 extends in a direction toward the outer peripheral side of the wiring board 8 toward the tip end of the second through groove 812.

The two windings 261 drawn from the same coil 26 are connected to two winding connection portions 80 adjacent in the circumferential direction. As shown in FIGS. 4 and 5, one of the two winding connection portions 80 to which the winding 261 drawn from the same coil 26 is connected is defined as a winding connection portion 80CW in the circumferential direction. The other side is a winding connection part 80CCW. The winding connection portion 80CW is located in the clockwise direction CW when viewed from the surface layer side shown in FIG. 4 (that is, when viewed from the non-output side L2), and the winding connection portion 80CCW is viewed from the surface layer side. In the counterclockwise direction CCW. In the present embodiment, the wiring board 8 is provided with twelve sets of the winding connection portions 80CW and 80CCW.

  The locking portion 81 of the winding connection portion 80CW and the locking portion 81 of the winding connection portion 80CCW have shapes that are line-symmetric with respect to the center line Q of the coil 26 connected to the winding connection portions 80CW and 80CCW. . That is, the first through groove 811 of the winding connection portion 80CW and the first through groove 811 of the winding connection portion 80CCW are arranged at positions equidistant from the center line Q in the circumferential direction, and are parallel to the center line Q. Extends to. The second through-groove 812 provided on one of the winding connection portions 80CW, 80CCW and the second through-groove 812 provided on the other extend in the circumferential direction toward opposite sides. The second through-groove 812 of the winding connection portion 80CW is located on the side opposite to the center line Q with respect to the first through-groove 811 (that is, in the clockwise direction CW). The second through-groove 812 of the winding connection portion 80CCW is located on the opposite side of the first through-groove 811 from the center line Q (that is, in the counterclockwise direction CCW).

  In each of the winding connection portions 80CW and 80CCW, the connection position P at which the first through groove 811 and the second through groove 812 are connected is the drawing position R (see FIG. 3) where the winding 261 is pulled out from the coil 26 and the axis. These positions overlap when viewed from the direction L. If the connection position P and the pull-out position R overlap each other when viewed from the axial direction L, when the winding 261 pulled out from the coil 26 is tilted to the outer peripheral side, the winding 261 tilted to the outer peripheral side and the first through groove are formed. 811 when viewed from the axial direction L. Further, in the present embodiment, a concave groove 254 is formed in the wall portion 253 of the insulator 25 in which the winding 261 which has been tilted to the outer peripheral side is formed, and the circumferential position of the concave groove 254 coincides with the extraction position R. , The concave groove 254 overlaps with the first through groove 811 when viewed from the axial direction L. Therefore, the winding 261 placed in the concave groove 254 and lowered to the outer peripheral side is again raised to the non-output side L2, so that the winding 261 can be easily inserted into the first through groove 811. Then, when the winding 261 is raised so as to be substantially perpendicular to the wiring board 8, the winding 261 is arranged at a connection position P between the first through groove 811 and the second through groove 812. Therefore, the winding 261 can be easily inserted into the second through groove 812.

  In the present embodiment, as shown in FIG. 3, a circumferential distance D1 between two windings 261 drawn from the same coil 26 and a circumferential distance D2 between two windings 261 drawn from different coils 26 are different. And D1 is smaller than D2. As described above, the wiring board 8 is configured such that the circumferential position of the first through groove 811 and the drawing position R of the winding 261 arranged in the first through groove 811 match. Therefore, as shown in FIG. 4, two adjacent winding connection portions 80 connected to the same coil 26 have a circumferential interval D1 of the first through groove 811 and are connected to different coils. Two adjacent winding connection portions 80 have a circumferential interval D1 of the first through groove 811.

  The land 82 is provided at an edge of the second through groove 812. In the present embodiment, the direction in which the second through-grooves 812 are located relative to the first through-grooves 811 is a direction in which the distance between the lands 82 adjacent in the circumferential direction increases. That is, the side where the second through-groove 812 is located with respect to the first through-groove 811 is the side where the farthest first through-groove 811 is located among the first through-grooves 811 adjacent in the circumferential direction. In other words, the circumferential distance between the first through-grooves 811 of the adjacent winding connection portions 80 on one side in the circumferential direction and the first through-grooves 811 of the adjacent winding connection portions 80 on the other side in the circumferential direction. Is the side where the first through groove 811 on the far side is located.

In the present embodiment, as described above, since D1 <D2, the side where the first through-groove 811 on the far side among the first through-grooves 811 that are adjacent in the circumferential direction is located at the center line Q of the coil 26. It is not the same side but the opposite side in the circumferential direction from the center line Q. Therefore, the second through groove 812 is located on the opposite side of the first through groove 811 from the center line Q. Thereby, the second through-grooves 8 that are adjacent to each other in the circumferential direction are compared with the case where the second through-grooves 812 are located on the same side as the center line Q with respect to the first through-grooves 811.
Twelve intervals can be increased. Therefore, the interval between the lands 82 adjacent in the circumferential direction can be increased.

  As shown in FIG. 5, in each winding connection portion 80, the land 82 to which the winding 261 is soldered is provided at the edge of the tip of the second through groove 812. The land 82 has a circular shape centered on the tip of the second through groove 812. The conduction portion 86 is provided on the inner surface of the second through groove 812. The conduction portion 86 is a conductive metal layer, and is provided on at least a part of the inner surface of the second through groove 812. In the present embodiment, the conducting portion 86 extends to the edge of the second through groove 812 and is connected to the land 82. The conductive portion 86 is electrically connected to the pattern of each layer of the wiring board 8 which is a multilayer board and the lands 82 provided on the surface layer of the wiring board 8.

  When the winding 261 is connected to the winding connecting portion 80, the winding 261 which has been turned to the outer peripheral side is raised from the concave groove 254, and is opened at the outer peripheral end of the wiring board 8 as shown by the arrow A in FIG. The winding 261 is inserted into the first through groove 811 to be formed. Then, the winding 261 is inserted into the second through groove 812 via the connection position P between the first through groove 811 and the second through groove 812, and the winding 261 is locked to the locking portion 81. Thereafter, as shown by a broken line in FIG. 5, the terminal of the winding 261 is turned down toward the tip end of the second through groove 812, and the terminal of the winding 261 is brought into contact with the land 82 and soldered.

  The winding 261 that has once fallen to the outer peripheral side has a tendency to fall to the outer peripheral side, and a stress is generated in the winding 261 in the direction to fall to the outer peripheral side. Therefore, the winding 261 is urged toward the tip end of the second through groove 812 by this stress. Therefore, the winding 261 can be easily laid on the land 82, so that soldering is easy.

  FIG. 6 is a cross-sectional view of the second through groove 812 and the winding 261 and is a partial cross-sectional view taken along a line BB in FIG. As shown in FIGS. 5 and 6, in the winding 261, the portion arranged in the second through groove 812 extends along the extending direction of the second through groove 812, and It extends in an inclined direction. As shown in FIG. 6, by folding the winding 261 toward the distal end of the second through groove 812, the terminal portion of the winding 261 becomes obtuse near the contact position with the edge of the distal end of the second through groove 812. , And extends along the surface of the land 82. In this state, the winding 261 is fixed to the land 82 with the solder 9.

  As shown in FIG. 5, the through-hole 83 arranged near the winding connection portion 80 extends from the region opposite to the second through-groove 812 in the circumferential direction with respect to the first through-groove 811 from the first through-groove 812 It is arranged over a region on the inner peripheral side of the groove 811 and the second through groove 812. The circular edge surrounding the through hole 83 and the inner surface of the through hole 83 are made of conductive metal. The pattern of each layer provided on the wiring board 8 and the wiring pattern 85 for connection provided on the surface layer are electrically connected through the through hole 83.

(Main effects of this embodiment)
As described above, the motor 1 of the present embodiment supplies a drive current to the coil 26 of the stator 23 via the wiring board 8. The winding 261 of the coil 26 is soldered to the land 82 while being locked by the locking portion 81 of the wiring board 8. Therefore, since the winding 261 does not need to be entangled with the terminal pin, the coil 26 and the lead wire 27 can be connected using the wiring board 8 even if the winding 261 has a large winding diameter. Further, the locking portion 81 includes a first through groove 811 extending from the outer peripheral end of the wiring board 8 to the inner peripheral side, and a second through groove 812 connected to the first through groove 811. A part extends in the direction toward the outer peripheral side of the wiring board 8 as going to the side opposite to the side of the connection position P connected to the first through groove 811. As described above, if at least a part of the second through groove 812 has a shape facing the outer peripheral side of the wiring board 8, the winding 261 is detached from the locking portion 81 by inserting the winding 261 into the second through groove 812. Can be suppressed. That is, when the winding 261 has a tendency to fall to the outer peripheral side, the winding 261 is urged to the side opposite to the connection position P. Return is suppressed. Even when the winding 261 does not have a tendency to fall to the outer peripheral side, the circumferential movement of the winding 261 in the second through groove 812 is suppressed. Therefore, since the winding 261 is less likely to move in the second through groove 812, the return of the winding 261 to the first through groove 811 is suppressed. Therefore, since there is little possibility that the winding 261 is detached from the locking portion 81, the work of soldering is easy, and the work of connecting the winding 261 to the wiring board 8 is easy.

  In the present embodiment, the land 82 of the winding connection portion 80 is provided on the edge of the second through groove 812 and is connected to the conductive portion 86 provided on the inner surface of the second through groove 812. Therefore, the land 82 can be easily brought into contact with the winding 261 by tilting the winding 261. Further, the pattern provided on each layer of the wiring board 8 and the winding 261 can be electrically connected via the conductive portion 86. Therefore, the allowable current can be increased. Further, since the winding 261 can be soldered not only to the land 82 but also to the inner surface of the second through groove 812, the fixing strength of the winding 261 can be improved.

  In the wiring board 8 of the present embodiment, a through hole 83 is formed in a region surrounding the locking portion 81. Therefore, the pattern of each layer in the wiring board 8 and the winding 261 can be electrically connected through the through hole 83. Therefore, the allowable current can be increased.

  In the present embodiment, the connection position P where the first through-groove 811 and the second through-groove 812 are connected is a position that overlaps with the drawing position R where the winding 261 is drawn from the coil 26 when viewed from the axial direction L. Therefore, the winding 261 can be easily inserted into the entrance of the second through groove 812, and the winding 261 can be easily locked in the second through groove 812. Further, the winding 261 is difficult to return to the entrance side of the first through groove 811. Therefore, the winding 261 does not easily come off from the locking portion 81. Therefore, the work of soldering is easy, and the work of connecting the winding 261 to the wiring board 8 is easy. For example, after all the windings 261 are arranged in the notches, soldering can be performed at once. Accordingly, the plurality of windings 261 can be efficiently soldered.

  In the present embodiment, the insulator 25 is provided with a wall portion 253 disposed on the outer peripheral side of the coil 26, and the wall portion 253 includes a concave groove 254 on which a winding 261 drawn to the outer peripheral side of the wall portion 253 is disposed. The concave groove 254 overlaps the first through groove 811 when viewed from the axial direction L. Thereby, when the winding 261 is tilted to the outer peripheral side and the wiring board 8 is arranged, it is possible to avoid interference between the insulator 25 and the winding 261. Further, since the concave groove 254 and the first through groove 811 overlap when viewed from the axial direction L, the winding 261 can be easily inserted into the first through groove 811.

  In the present embodiment, the winding 261 is tilted to the tip side of the second through groove 812 in the second through groove 812, and extends in the second through groove 812 in the extending direction of the second through groove 812. Since at least a part of the land 82 is provided on the tip side of the second through-groove 812, the winding 261 turned down to the tip side of the second through-groove 812 is arranged on the land 82. As described above, in the present embodiment, the winding 261 is tilted toward the distal end side of the second through groove 812, and the winding 261 is inclined in the second through groove 812 with respect to the thickness direction of the wiring board 8. Has become. Therefore, it is not necessary to bend the winding 261 at a substantially right angle in order to bring the winding 261 into contact with the land 82, but it is sufficient to bend the winding 261 at an obtuse angle. Therefore, since the stress applied to the winding 261 is small, the soldered winding 261 does not easily come off the land 82. Further, when the conductive portion 86 is provided on the inner surface of the second through groove 812, the contact area with the conductive portion 86 can be increased. Furthermore, since the winding 261 extends in the second through groove 812 in the extending direction of the second through groove 812, the range in which the second through groove 812 is closed by the winding 261 is large. Therefore, it is possible to reduce the possibility that the solder drips from the second through groove 812 to the stator 23 side.

  The wiring board 8 of the present embodiment is provided with a plurality of winding connection portions 80 each having a locking portion 81 and a land 82, and in each winding connection portion 80, a second through groove 812 is formed with respect to the first through groove 811. The located side is the first through-groove 811 of the winding connection part 80 adjacent on one side in the circumferential direction and the first through-groove 811 of the winding connection part 80 adjacent on the other side in the circumferential direction. Is the side where the first through groove 811 on the far side is located. Thereby, the second through-groove 812 can be arranged on the side where the distance between the lands 82 adjacent in the circumferential direction becomes large. Therefore, when the winding 261 arranged in the second through groove 812 is soldered to the land 82, the solder protrudes not only to the land 82 of the winding connection part 80 but also to the land 82 of the adjacent winding connection part 80. As a result, it is possible to avoid a situation in which the lands 82 of the adjacent winding connection portions 80 are conducted.

(Modification)
(1) FIG. 7 is an explanatory view showing a modification of the locking portion. FIG. 7A shows a locking portion 81A including a linear first through groove 811 extending in the radial direction and a semicircular second through groove 812A. FIG. 7B shows a locking portion 81B including a linear first through groove 811 extending in the radial direction and a second through groove 812B connected to the inner peripheral end of the first through groove 811. . The second through-groove 812B includes a first portion 813 extending in the circumferential direction from the inner peripheral end of the first through-groove 811 and a second portion 814 bent from the first portion 813 to the outer peripheral side. FIG. 7 (c) shows an engagement provided with a linear first through groove 811C extending in a direction inclined with respect to the radial direction, and a second through groove 812C connected to the first through groove 811 at an obtuse angle. The stop portion 81C. 7A to 7C, at least a part of the second through-grooves 812A, 812B, and 812C extends toward the outer peripheral side toward the side opposite to the side connected to the first through-groove 811. ing. Therefore, similarly to the above-described embodiment, it is possible to prevent the winding 261 from returning to the first through grooves 811 and 811C, and to prevent the winding 261 from coming off from the locking portions 81A, 81B and 81C. Therefore, the work of soldering is easy, and the work of connecting the winding 261 to the wiring board 8 is easy.

(2) In the above embodiment, the winding 261 inserted into the second through groove 812 is tilted to the outer peripheral side and soldered to the land 82. However, the winding 261 is left standing without being tilted. The winding 261 may be soldered in a standing state. In this case, a conductive portion 86 is provided at a portion of the inner surface of the first through groove 811 and the second through groove 812 that can contact the winding 261, and the winding 261 is soldered to the land using the conductive portion 86 as a land. do it.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor part, 3 ... Electromagnetic brake, 4 ... Encoder, 5 ... Motor case, 6 ... Encoder cover, 8 ... Wiring board, 9 ... Solder, 10 ... Rotary shaft, 11 ... Output side bearing, 12 ... Non-output side bearing, 13: motor side rotating shaft, 14: encoder side rotating shaft, 21 ... magnet, 22 ... rotor, 23 ... stator, 24 ... stator core, 25 ... insulator, 26 ... coil, 26U ... U phase coil, 26V ... V-phase coil, 26W ... W-phase coil, 27 ... lead wire, 31 ... friction plate, 32 ... armature, 33 ... plate, 34 ... solenoid, 35 ... lead wire, 41 ... magnet holder, 42 ... encoder magnet, 43 ... Magnetic sensing element, 44: sensor substrate, 45: substrate holder, 51: core holder, 52: bearing holder, 53: brake case, 54: bottom, 55 Cylindrical part, 56: Wiring take-out part, 80, 80CW, 80CCW: Winding connection part, 81, 81A, 81B, 81C: Locking part, 82: Land, 83: Through hole, 84: Land, 85: Connection Wiring pattern, 86 conducting part, 100 output shaft, 241 salient pole, 251 counter output side flange part, 252 output side flange part, 253 wall part, 254 concave groove, 261 winding, 561 Notch, 562: Holder, 811, 811C: First through groove, 812, 812A, 812B, 812C: Second through groove, 813: First part, 814: Second part, CCW: Counterclockwise direction, CW: Clockwise direction, D1... Circumferential distance between two windings 261 drawn from the same coil, D2... Circumferential distance between two windings 261 drawn from different coils, L. axial direction, L1. Output side, 2 ... counter output side, P ... connection position, the center line of the Q ... coil, pull-out position of the R ... winding

Claims (7)

A stator core having a plurality of salient poles, and a stator having a coil wound around each salient pole via an insulator;
A power supply line through which a drive current supplied to the coil flows, and a wiring board that connects a winding of the coil,
The wiring board is provided with a locking portion for locking the winding, and a land to which the winding is soldered,
The locking portion includes a first through groove cut out from an outer peripheral end of the wiring board toward an inner peripheral side, and a second through groove connected to an inner peripheral end of the first through groove. ,
A motor, wherein at least a part of the second through groove extends in a direction toward the outer peripheral side of the wiring board as going to a side opposite to a side connected to the first through groove.   The motor according to claim 1, wherein the land is provided at an edge of the second through groove, and is connected to a conductive portion provided on an inner surface of the second through groove.   The motor according to claim 1, wherein the wiring board includes a through hole formed in a region surrounding the locking portion.   The position at which the first through groove and the second through groove are connected is a position that overlaps with a drawing position at which the winding is drawn from the coil when viewed from the axial direction of the stator. The motor according to any one of claims 1 to 3. The insulator includes a wall disposed on an outer peripheral side of the coil,
The wall portion includes a concave groove in which the windings drawn out to the outer peripheral side of the wall portion are arranged,
The motor according to claim 4, wherein the concave groove overlaps the first through groove when viewed from the axial direction. The winding is tilted toward the tip of the second through groove, extends in the extending direction of the second through groove in the second through groove,
The motor according to any one of claims 1 to 5, wherein at least a part of the land is provided on a tip side of the second through groove. The wiring board is provided with a plurality of winding connection portions including the locking portions and the lands,
In each winding connection portion, the side where the second through groove is located with respect to the first through groove is the first through groove of the winding connection portion adjacent on one side in the circumferential direction and the other in the circumferential direction. 7. The first through-groove of the winding connection portion which is adjacent on the side is a side where the first through-groove on the side where the circumferential distance is far is located. The motor according to claim 1.

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