JP2018057099A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the drawn length of a lead wire 24 by suppressing variation in the height of the lead wire 24 that is drawn out from a core holder 11 and is drawn in an axial direction L.SOLUTION: In a motor 1, a through portion 41 is formed in a cylindrical core holder 11 (a cylindrical part), and a lead wire holder 42 is fixed in the through portion 41, so that a lead wire take-out part 40 is formed. A pressing member 43 is fixed to the lead wire holder 42. The pressing member 43 includes a lead wire pressing section 432 which is opposed to a wiring hole 422 formed in the lead wire holder 42. When a lead wire 24 drawn out from the wiring hole 422 is bent in the axial direction L of the core holder 11 so as to be drawn out toward an output side L1, the height (the height from the wiring holde 422) of the lead wire 24 is restricted by the lead wire pressing section 432.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a motor in which a lead wire is pulled out from a motor case.

  In a motor in which a stator and a rotor are housed in a motor case, a lead wire for feeding power to the stator coil is drawn out from a through portion that penetrates the motor case. Patent Document 1 discloses a motor in which a lead bush (lead wire holder) is attached to a lead hole (through portion) formed in an outer frame (motor case). In Patent Document 1, the lead bush includes the same number of wiring holes (lead wire through holes) as the number of lead wires. The lead wires are passed one by one through the lead wire through holes and drawn out to the outside. The lead wire through hole penetrates the lead bush in the radial direction of the motor. Therefore, the lead wire is drawn out radially from the side surface of the motor.

JP-A-9-308175

  If the lead wire is pulled out from the side of the motor in the radial direction, the lead wire height may vary when the lead wire is routed in the motor axial direction or bent from the root to change the lead wire pull-out direction. There is. If the height of the lead wire varies, the length required for routing the lead wire may increase. In addition, there is a possibility that the jumping amount of the lead wire jumping out from the side surface of the motor to the outside in the radial direction becomes large. If the amount of lead wire protruding is large, the arrangement space of the motor becomes large.

  In view of the above problems, the object of the present invention is to reduce the length of the lead wire drawn from the motor case, shorten the length required for the lead wire routing, and lead the lead to the outside of the motor case. The purpose is to suppress the amount of jumping out of the line.

  In order to solve the above problems, the present invention includes a rotor and a stator, a motor case that houses the rotor and the stator, a lead wire holder that is attached to the motor case, and a pressing member that is attached to the lead wire holder. And the lead wire holder includes a seat portion that contacts the motor case, and a pressing member fixing portion that is formed integrally with the seat portion, and the pressing member is a wiring hole that passes through the lead wire holder. And a lead wire pressing portion that faces the head.

According to the present invention, the lead wire holder is fixed to the motor case, and the pressing member fixed to the lead wire holder includes the lead wire pressing portion facing the wiring hole formed in the lead wire holder. Thereby, the lead wire pulled out from the wiring hole can be bent and pulled out parallel to the surface to which the lead wire holder is attached. Moreover, the height from the wiring hole of the lead wire drawn out and bent from the wiring hole can be regulated by the lead wire pressing portion. Therefore, it is possible to prevent the base height of the lead wire lead-out portion from varying. In addition, by reducing the height of the lead wire, the length necessary for routing the lead wire can be shortened, and the amount of the lead wire protruding to the outside of the motor case can be suppressed. Further, when a plurality of lead wires are pulled out, the heights can be made uniform, and the lengths necessary for routing the plurality of lead wires can be made uniform.

  In the present invention, the motor case includes a cylindrical portion that surrounds the outer peripheral sides of the rotor and the stator, the lead wire holder is attached to the cylindrical portion, and the wiring hole is orthogonal to the axial direction of the cylindrical portion. It is desirable that a plurality are arranged in the direction. In this way, when the lead wires drawn out from the wiring holes are bent in the axial direction and routed along the cylindrical portion, the lengths of the plurality of lead wires can be made uniform. Further, it is possible to prevent the length necessary for routing some of the lead wires from being increased as in the case where the wiring holes are arranged in the axial direction. Therefore, compared to the case where the wiring holes are arranged in the axial direction, the total length necessary for routing the lead wire can be shortened.

  In the present invention, it is preferable that a heat shrinkable tube for binding a plurality of lead wires passed through the plurality of wiring holes is provided, and an edge of the pressing member is in a position covering the heat shrinkable tube. If it does in this way, a some lead wire can be put together by a heat contraction tube. Further, the lead wire can be protected by the heat shrinkable tube, and damage to the lead wire due to contact with the edge of the pressing member can be prevented.

  In the present invention, the seat portion is plate-shaped, the pressing member fixing portion is a wall portion that protrudes from the seat portion and surrounds the outer periphery of the wiring hole, and a part of the wall portion in the circumferential direction is the seat portion. It is desirable that the height of the protrusion is lower than the other part, and a gap through which the lead wire passes is provided between the step and the lead wire pressing part. If it does in this way, when pulling out a lead wire from a crevice, the position of a lead wire can be regulated by a wall part. Therefore, it is possible to prevent the positions of the lead wires from varying, and a plurality of lead wires can be pulled out well.

  In the present invention, the lead wire holder includes a convex portion that fits into a penetrating portion formed in the motor case, and a mold resin portion that covers the stator is provided on an inner periphery of the motor case. Is desirable. If it does in this way, a penetration part can be plugged up with a convex part. Therefore, there is little possibility that the resin for forming the mold resin portion leaks from the gap between the lead wire holder and the through portion.

  In the present invention, it is desirable that the mold resin portion is disposed on the inner peripheral side of the position where the lead wire holder is attached. In this way, the lead wire drawn from the stator to the lead wire holder is covered with the molding resin. Therefore, the heat radiation effect can be enhanced against the heat generated from the stator covered with the molding resin.

  In the present invention, the wiring hole is opened at the front end surface of the convex portion, and a peripheral wall surrounding the region where the wiring hole opens is formed on the front end surface, and the lead wire and the wiring hole that are passed through the wiring hole It is desirable to provide an adhesive disposed in the gap. If it does in this way, it can control that resin which fills the crevice between a lead wire and a wiring hole spreads more than necessary. In addition, when the molding resin is filled inside the motor case, the resin can be prevented from leaking from the wiring hole.

  In the present invention, it is desirable to include a fixing member that fixes the pressing member or the lead wire holder to the motor case, and a frame ground terminal that is electrically connected to the motor case via the fixing member. In this way, it is not necessary to use a dedicated component for mounting the frame ground terminal and for electrical connection with the motor case. Therefore, the number of parts can be reduced.

According to the present invention, the lead wire holder is fixed to the motor case, and the pressing member fixed to the lead wire holder includes the lead wire pressing portion facing the wiring hole formed in the lead wire holder. Thereby, the lead wire pulled out from the wiring hole can be bent and pulled out parallel to the surface to which the lead wire holder is attached. Moreover, the height from the wiring hole of the lead wire drawn out and bent from the wiring hole can be regulated by the lead wire pressing portion. Therefore, it is possible to prevent the base height of the lead wire lead-out portion from varying. In addition, by reducing the height of the lead wire, the length necessary for routing the lead wire can be shortened, and the amount of the lead wire protruding to the outside of the motor case can be suppressed.

It is the external appearance perspective view which looked at the motor concerning the present invention from the output side. It is sectional drawing which cut | disconnected the motor by the surface parallel to an axial direction. It is sectional drawing which cut | disconnected the motor by the surface perpendicular | vertical with respect to the axial direction. It is a disassembled perspective view of a core holder and a lead wire taking-out part. It is a disassembled perspective view of a core holder and a lead wire taking-out part. It is sectional drawing of a lead wire extraction part. It is a perspective view of a feeder line and a lead wire take-out unit that are bound by a heat-shrinkable tube. It is a perspective view which shows the lead wire holder of a modification.

  Embodiments of a motor to which the present invention is applied will be described below with reference to the drawings. FIG. 1 is an external perspective view of a motor 1 according to the present invention as viewed from the output side, and FIG. 2 is a cross-sectional view of the motor 1 cut along a plane parallel to the axial direction L. FIG. 3 is a cross-sectional view of the motor 1 cut along a plane perpendicular to the axial direction L. In the present specification, of 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 projects is referred to as an output side L 1, and the side opposite to the side on which the output shaft 100 projects. The non-output side L2. Two directions orthogonal to the axial direction L are defined as an X direction and a Y direction. The output shaft 100 of the motor 1 is provided at the end of the output side L1 of the motor side rotating shaft 31 that extends in the axial direction L at the center of the motor 1.

(Encoder)
The motor 1 according to this embodiment is a motor with an encoder in which an encoder 5 is detachably attached to an end of the motor body 2 on the opposite output side L2. As shown in FIG. 2, the encoder 5 includes an encoder-side rotary shaft 51 connected to an end portion (a small-diameter portion 34 described later) of the motor-side rotary shaft 31 on the counter-output side L2 via a coupling 4, A magnet 53 attached to the tip of the rotating shaft 51 on the counter-output side L2 via a magnet holder 52, a magneto-sensitive element 54 such as an MR element facing the magnet 53 on the counter-output side L2, the magnet 53 and the sensor An encoder cover 60 that houses the magnetic element 54 is provided. In this embodiment, the coupling 4 is an Oldham coupling, and has a structure capable of absorbing a shaft misalignment (eccentricity) between the motor side rotating shaft 31 and the encoder side rotating shaft 51.

  The encoder cover 60 includes a first cover 61 made of metal and a second cover 62 made of resin. The first cover 61 is fixed to the opposite output side L <b> 2 of the second cover 62. The magnet 53 and the magnetosensitive element 54 are disposed inside the first cover 61. The encoder cover 60 is attached to the motor main body 2 so that the resin-made second cover 62 abuts on the end surface (the flange 19 of the second bearing holder 13 to be described later) of the motor main body 2 on the counter-output side L2. The encoder cover 60 includes a fixing hole (not shown) that passes through the first cover 61 and the second cover 62, and a fixing screw (not shown) that passes through the fixing hole is tightened into the screw hole of the motor body 2. Thus, the encoder 5 is detachably attached to the motor body 2. The encoder 5 includes a signal line 64 (see FIG. 1) that transmits an angle detection signal based on the output of the magnetosensitive element 54. The signal line 64 is led out from a signal line outlet (not shown) provided in the first cover 61.

A third bearing holder 63 is fixed at the center of the second cover 62. The encoder-side rotating shaft 51 is rotatably supported at two locations separated in the axial direction L by the two bearings 65 and 66 held on the inner peripheral side of the third bearing holder 63. A substrate holder 55 is fixed to the counter-output side L2 of the third bearing holder 63. On the inner peripheral side of the substrate holder 55, a magnet holder 52 and a magnet 53 fixed to the tip of the encoder side rotating shaft 51 are arranged. The sensor substrate 56 on which the magnetosensitive element 54 is mounted is fixed to the end of the substrate holder 55 on the counter-output side L2. The sensor substrate 56 is covered with the cup-shaped sensor cover 57 fixed to the inside of the first cover 61 on the counter-output side L2 and the outer peripheral side.

(Motor body)
The motor body 2 includes a motor housing 10, a cylindrical stator 20 disposed inside the motor housing 10, and a rotor 30 disposed rotatably inside the stator 20. As shown in FIGS. 2 and 3, the rotor 30 includes a motor-side rotating shaft 31, a rotor core 32 fixed to the outer peripheral side of the motor-side rotating shaft 31, and a magnet 33 fixed to the outer peripheral surface of the rotor core 32. . In this embodiment, the motor side rotating shaft 31 is made of a magnetic material, and the encoder side rotating shaft 51 is made of a nonmagnetic material. The encoder side rotating shaft 51 may be a magnetic material.

  The motor housing 10 includes a cylindrical core holder 11 whose opening is directed in the axial direction L of the motor 1, a first bearing holder 12 fixed to an end of the output side L <b> 1 of the core holder 11, and a non-output side L <b> 2 of the core holder 11. The 2nd bearing holder 13 fixed to the edge part of this is provided. A first bearing 14 is held on the inner peripheral side of the first bearing holder 12. A second bearing 15 is held on the inner peripheral side of the second bearing holder 13. The first bearing 14 and the second bearing 15 are ball bearings. The motor side rotating shaft 31 is rotatably supported by the first bearing 14 and the second bearing 15. The output shaft 100 is formed at the end of the motor-side rotating shaft 31 that protrudes from the first bearing holder 12 to the output side L1. As shown in FIG. 1, the first bearing holder 12 and the second bearing holder 13 are screwed to the core holder 11 by a fixing screw 16.

  As shown in FIG. 2, a recess 18 that is recessed on the output side L <b> 1 is formed in the center of the second bearing holder 13, and a flange 19 is formed on the outer peripheral side of the recess 18. The second bearing 15 is disposed in the recess 18, and the inner ring of the second bearing 15 is fixed to a small diameter portion 34 formed in the portion on the counter-output side L <b> 2 of the motor side rotating shaft 31. On the outer peripheral edge of the flange 19, an annular convex portion 191 that fits into the end of the core holder 11 on the counter-output side L <b> 2 is formed. Further, the second cover 62 of the encoder cover 60 contacts the flange 19 from the non-output side L2. The encoder cover 60 is screwed to the flange 19. The flange 19 is formed with a fin 192 that protrudes to the counter-output side L2 on the outer peripheral side of the encoder cover 60. The fins 192 are arranged radially around the encoder cover 60.

  As shown in FIGS. 2 and 3, the stator 20 is formed by winding an annular stator core 21 having a plurality of salient poles at equiangular intervals, and each salient pole of the stator core 21 via an insulating member 22 (see FIG. 2). The drive coil 23 is provided. The insulating member 22 is made of a resin material such as PET (polyethylene terephthalate). Stator core 21 is formed of a laminated core in which a plurality of silicon steel plates are laminated. As shown in FIG. 3, the core holder 11 has a rectangular tube shape on the outer peripheral surface, but has a cylindrical shape on the inner peripheral surface. The stator core 21 includes an annular portion 211 that is inscribed in the core holder 11 and a plurality of salient poles 212 that protrude radially inward from the annular portion 211. On the outer peripheral surface of the annular portion 211, a groove-shaped recess 213 is formed that extends from one end portion in the axial direction L of the stator core 21 to the other end portion. The groove-shaped recess 213 is provided at the same angular position as the center of the salient pole 212 in the circumferential direction. The stator core 21 includes a plurality of divided cores 21A in which the annular portion 211 is divided in the circumferential direction for each salient pole 212.

The drive coil 23 is connected to the lead wire 24 through a crimp terminal. The drive coil 23 is supplied with three-phase currents of U phase, V phase, and W phase via lead wires 24. That is, the lead wire 24 is a power supply line. The three lead wires 24 connected to the drive coil 23 are drawn out through the lead wire take-out portion 40 provided in the core holder 11.

  The stator core 21 and the drive coil 23 fixed to the inner side of the core holder 11 are covered with a mold resin portion 26 (see FIG. 2). The mold resin portion 26 is formed as follows. The stator core 21 is fixed inside the core holder 11 by shrink fitting or press fitting, the lead wire 24 is connected to the drive coil 23, and the lead wire 24 is drawn out from the lead wire take-out portion 40 formed on the side surface 110 of the core holder 11. After that, a mold is disposed inside the stator core 21. When a molding resin is injected between the mold and the core holder 11, the resin flows between the salient poles 212 adjacent to each other in the circumferential direction and through the groove-shaped recess 213 provided on the outer peripheral surface of the annular portion 211, It is filled between the mold and the core holder 11. When the filled resin is solidified, a mold resin portion 26 that covers the stator core 21 and the drive coil 23 is formed.

  In this embodiment, for example, BMC (Bulk Molding Compound) is used as the resin for molding. BMC is a resin material in which an unsaturated polyester resin, a filler such as calcium carbonate, and glass fiber are mixed. The mold resin portion 26 transmits heat generated by the drive coil 23 to the core holder 11. Therefore, the heat generated in the drive coil 23 can be efficiently released. Further, the drive coil 23 and the lead wire 24 are completely covered with the mold resin portion 26 and insulated.

(Core holder)
The core holder 11 is made of metal. In this embodiment, the core holder 11 is made of aluminum, and is formed by extrusion molding in the axial direction L from the extrusion die. The core holder 11 has a rectangular tube shape as a whole when viewed from the outside. The outer peripheral surface of the core holder 11 includes a side surface 110 facing the + X direction, a side surface 120 facing the −X direction, a side surface 130 facing the + Y direction, and a side surface 140 facing the −Y direction. On the outer peripheral surface of the core holder 11, a concave portion 150 that is recessed toward the inner peripheral side is formed between side surfaces adjacent in the circumferential direction. The side surfaces 110, 120, 130, and 140 extend with a substantially constant width from one end to the other end in the axial direction L of the core holder 11.

  As shown in FIGS. 1 and 3, in the core holder 11, a first flat portion 111 is formed at the center in the width direction (Y direction) of the side surface 110 facing the + X direction. On the side surface 110, recesses 112 are formed on both sides of the first flat portion 111 in the width direction. Further, a thick portion 113 is formed on the outer side in the width direction of the recess 112 (on the side opposite to the first flat portion 111). The side surfaces 120, 130, and 140 have the same cross-sectional shape cut along a plane perpendicular to the axial direction L. A second flat portion 121 is formed at the center in the width direction (Y direction) of the side surfaces 120, 130, and 140, and a heat radiating portion 122 is formed on both sides of the second flat portion 121 in the width direction. Further, a thick portion 123 is formed on the outer side in the width direction of the heat radiating portion 122 (on the side opposite to the second flat portion 121). The heat dissipating part 122 includes fins 160 and grooves 170 extending in the axial direction L. The fins 160 and the groove portions 170 are arranged alternately.

(Lead wire take-out part)
As shown in FIG. 1, the lead wire take-out portion 40 is disposed at a position closer to the non-output side L2 of the side surface 110 facing the + X direction. As shown in FIG. 2, the lead wire take-out portion 40 includes a through portion 41 that penetrates the first flat portion 111 of the side surface 110, a lead wire holder 42 that is fixed at a position covering the through portion 41, and a lead wire holder 42. A pressing member 43 is provided. As shown in FIG. 3, the lead wire holder 42 has substantially the same width as the first flat portion 111. As shown in FIG. 1, the lead wire extraction unit 40 is provided with a frame ground terminal 44, and the ground line 25 is connected to the frame ground terminal 44.

  In the core holder 11, the mold resin portion 26 is disposed on the inner peripheral side of the position where the lead wire holder 42 is attached. In addition, the mold resin part 26 should just be extended to the inner peripheral side of the penetration part 41 within the range in which the lead wire holder 42 is attached. In this embodiment, the mold resin portion 26 extends to the vicinity of the opening of the core holder 11. Since the mold resin portion 26 extends to the inside of the through portion 41, the lead wire 24 is completely covered with the mold resin portion 26 inside the through portion 41. When forming the mold resin portion 26, the lead wire holder 42 attached to the core holder 11 closes the through portion 41 to form the lead wire extraction portion 40, and the lead wire 24 connected to the drive coil 23 is connected to the lead wire extraction portion. The resin for molding is filled in the state pulled out from 40.

  4 and 5 are exploded perspective views of the core holder and lead wire take-out portion 40. FIG. 4 shows a state seen from the + X direction side, and FIG. 5 shows a state seen from the −X direction side. FIG. 6 is a cross-sectional view (enlarged cross-sectional view of region A in FIG. 2) of the lead wire take-out portion 40. As shown in FIGS. 2 and 3, the lead wire takeout part 40 is provided on the first flat part 111 of the side surface 110 of the core holder 11. As shown in FIGS. 4 and 5, the through portion 41 penetrating the core holder 11 is formed in the center of the first flat portion 111 in the width direction (Y direction). The penetrating portion 41 is substantially rectangular, and its longitudinal direction coincides with a direction (Y direction) orthogonal to the axial direction L of the core holder 11.

  As shown in FIGS. 4 and 5, the lead wire holder 42 includes a substantially rectangular plate-shaped seat portion 423. As shown in FIG. 5, the seat portion 423 is integrally formed with a convex portion 421 that protrudes toward the core holder 11 (that is, in the −X direction). As shown in FIG. 6, the lead wire holder 42 is assembled to the core holder 11 such that the seat portion 423 contacts the first flat portion 111 and the convex portion 421 fits into the through portion 41. Fixing holes are formed at the corners of the seat 423. The lead wire holder 42 is fixed to the first flat portion 111 by a fixing member 46 such as a screw attached to the fixing hole. As shown in FIGS. 5 and 6, the seat portion 423 has a contact surface that contacts the first flat portion 111, and an annular seal groove 424 that surrounds the convex portion 421 is formed on the contact surface. . A seal material 45 such as an O-ring is disposed in the seal groove 424.

  A wiring hole 422 is formed in the lead wire holder 42. With the lead wire holder 42 attached to the core holder 11, the wiring hole 422 penetrates the convex portion 421 and the seat portion 423 in the radial direction (X direction) of the core holder 11. As shown in FIG. 5, a peripheral wall 425 surrounding the region where the wiring hole 422 opens is formed on the tip surface of the convex portion 421. As shown in FIG. 6, lead wires are passed through the wiring holes 422 one by one. A gap between the wiring hole 422 and the lead wire 24 is closed by the adhesive 426. Therefore, when the molding resin is filled inside the core holder 11, the resin can be prevented from leaking from the gap between the wiring hole 422 and the lead wire 24. Further, the peripheral wall 425 formed on the front end surface of the convex portion 421 restricts the adhesive 426 from spreading from the front end surface of the convex portion 421.

  As shown in FIG. 5, the convex portion 421 and the penetrating portion 41 are long in the width direction (Y direction) of the side surface 110. The convex portion 421 is located at the approximate center in the longitudinal direction (Y direction) of the seat portion 423. Further, the convex portion 421 is formed at a position near the counter-output side L2 of the seat portion 423. A plurality of wiring holes 422 are formed in the convex portion 421. The plurality of wiring holes 422 are arranged in a line in the longitudinal direction of the convex portion 421. When the projecting portion 421 is fitted to the penetrating portion 41, the wiring holes 422 are arranged in a line in a direction orthogonal to the axial direction L (Y direction). The number of wiring holes 422 is the same as the number of lead wires 24 (3 in this embodiment). Note that the number of wiring holes 422 is not limited to three, and a necessary number can be appropriately provided according to the number of lead wires taken out from the core holder 11.

As shown in FIG. 4, the lead wire holder 42 includes a pressing member fixing portion 427 that protrudes from the seat portion 423 to the opposite side (+ X direction) from the core holder 11. The pressing member fixing portion 427 is formed integrally with the seat portion 423. A region where a plurality of wiring holes 422 are opened is provided on the upper surface of the seat portion 423, and a wall-shaped pressing member fixing portion 427 surrounding the region is formed. The holding member fixing portion 427 includes a wall portion 427a positioned on the opposite output side L2 of the wiring hole 422, and wall portions 427b and 472c extending in the axial direction L from both ends of the wall portion 427a toward the output side L1. The pressing member fixing portion 427 includes a step portion 428 that connects the end portions on the output side L1 of the wall portions 427b and 472c. The stepped portion 428 has a lower protrusion height from the seat portion 423 than the wall portions 427a, 427b, and 427c. That is, the pressing member fixing portion 427 is formed with a cutout portion 429 surrounded by the step portion 428 and the wall portions 427b and 427c.

  The step portion 428 is located on the output side L1 of the wiring hole 422, and includes a chamfered portion 428a formed at a corner portion located on the wiring hole 422 side. Therefore, when the lead wire 24 drawn out from the wiring hole 422 is routed to the output side L1, the lead wire 24 is drawn out over the stepped portion 428 from the chamfered portion 428a side.

  As shown in FIGS. 4 and 5, the pressing member 43 is substantially rectangular, and its outer shape is substantially the same as the outer shape of the pressing member fixing portion 427. The pressing member 43 includes a fixing portion 431 that contacts the pressing member fixing portion 427 and a lead wire pressing portion 432 that faces the wiring hole 422 and the step portion 428. The fixing portion 431 is provided at the edge in the three directions, that is, the edge on the non-output side L2 of the pressing member 43 and the edges on both sides in the Y direction. Fixing holes are formed at the corners of the pressing member 43. The pressing member 43 is fixed to the pressing member fixing portion 427 at four positions by a fixing member 47 such as a screw passed through the fixing hole. One of the four fixing members 47 fixes the frame ground terminal 44 to the lead wire holder 42 together with the pressing member 43. The fixing member 47 is made of metal. Therefore, by passing the fixing member 47 through the fixing hole formed in the lead wire holder 42 and tightening the tip of the fixing member 47 into the fixing hole formed in the core holder 11, the frame ground terminal 44 is interposed via the fixing member 47. Is electrically connected to the core holder 11. Therefore, the frame ground can be grounded by the ground wire 25 attached to the frame ground terminal 44.

  The lead wire pressing portion 432 has a shape in which the central portion in the width direction (Y direction) swells in the + X direction. The lead wire pressing portion 432 includes a central portion 432a located at the center in the Y direction, and an inclined portion 432b inclined toward the fixing portion 431 on both sides in the Y direction of the central portion 432a and on the opposite output side L2. The Y direction is the direction in which the wiring holes 422 are arranged. That is, the lead wire pressing portion 432 has a shape in which the center in the arrangement direction of the plurality of wiring holes 422 swells in a direction away from the wiring holes 422 (+ X direction).

  Between the lead wire pressing portion 432 and the surface of the seat portion 423 where the wiring hole 422 opens, the lead wire 24 drawn out from the wiring hole 422 in the + X direction can be bent toward the output side L1. A space is provided. A step portion 428 is disposed on the output side L1 of the wiring hole 422, and a gap G larger than the outer diameter of the lead wire 24 is formed between the step portion 428 and the lead wire pressing portion 432. The lead wire 24 is pulled out from the wiring hole 422 in the + X direction, bent to the output side L1, the position in the + X direction is regulated by the lead wire pressing portion 432, guided in the axial direction L, and pulled out from the gap G to the outside. It is. Then, it is routed to the output side L1 along the side surface 110 of the core holder 11.

  The lead wire pressing portion 432 regulates the position (height) in the + X direction of the lead wire 24 when the lead wire 24 is pulled out. Therefore, the positions (heights) of the plurality of lead wires 24 in the + X direction can be aligned, and the length necessary for routing the lead wires 24 can be shortened. In addition, since the inclined portions 432 b are formed on both sides of the lead wire pressing portion 432 in the Y direction, the plurality of lead wires 24 are guided to the center of the lead wire pressing portion 432. Therefore, the plurality of lead wires 24 are restrained from variation in the arrangement direction and are pulled out well.

(Main effects of this form)
As described above, in the motor 1 of this embodiment, the through-hole 41 is formed in the cylindrical core holder 11 (tubular portion), and the lead wire take-out portion 40 is formed by the lead wire holder 42 attached to the through-hole 41. . A holding member 43 is fixed to the lead wire holder 42, and the holding member 43 includes a lead wire holding portion 432 facing the wiring hole 422 formed in the lead wire holder 42. Therefore, when the lead wire 24 drawn out from the wiring hole 422 is bent in the axial direction L of the core holder 11 and pulled out, the lead wire 24 can be guided by the lead wire pressing portion 432. The lead wire pressing portion 432 can regulate the height of the lead wire 24 bent in the axial direction L (height from the wiring hole 422). Therefore, it is possible to suppress variation in the height of the lead wire 24. Moreover, the required length of the lead wire 24 can be shortened by reducing the height of the lead wire 24. Moreover, the amount of protrusion of the lead wire 24 to the outer peripheral side of the core holder 11 can be suppressed, and the protruding height of the lead wire take-out portion 40 from the core holder 11 can be suppressed. Thereby, when the motor 1 is incorporated into various devices, it is not necessary to provide a relief portion on the device side so as to avoid interference with the lead wire take-out portion 40. That is, an increase in the arrangement space of the motor 1 can be suppressed. Further, when the plurality of lead wires 24 are pulled out, the heights thereof can be made uniform, so that the lengths of the plurality of lead wires 24 can be made uniform.

  In this embodiment, a plurality of wiring holes 422 are provided in the lead wire holder 42, and the plurality of wiring holes 422 are arranged in a line in a direction (Y direction) orthogonal to the axial direction L of the core holder 11. Accordingly, when the plurality of lead wires 24 are routed in the axial direction L, the lengths of the lead wires 24 can be made uniform. Further, when the wiring holes 422 are arranged in the axial direction L, the length of some of the lead wires 24 is increased, but in this embodiment, the length of all the lead wires 24 can be shortened. Therefore, compared with the case where the wiring holes 422 are arranged in the axial direction L, the required length of the lead wire 24 can be shortened.

  In this embodiment, the lead wire holder 42 includes a plate-like seat portion 423 and a pressing member fixing portion 427 formed integrally with the seat portion 423. The holding member fixing portion 427 includes wall portions 427a, 427b, and 427c surrounding the outer periphery of the wiring hole 422 formed in the seat portion 423, and a step portion 428 that is lower than the wall portions 427a, 427b, and 427c in a part in the circumferential direction. Is provided. Therefore, the lead wire 24 can be pulled out from the gap G between the step portion 428 and the lead wire pressing portion 432. In addition, since the position of the lead wire 24 is regulated by the wall portions 427b and 427c, the plurality of lead wires 24 can be pulled out well.

  In this embodiment, a mold resin portion 26 that covers the stator 20 and the drive coil 23 is provided on the inner periphery of the core holder 11, and the convex portion 421 of the lead wire holder 42 is fitted into the through portion 41 of the core holder 11. Therefore, since the penetration part 41 of the core holder 11 can be closed except for the wiring hole 422, there is little possibility that the resin for forming the mold resin part 26 leaks from the gap between the lead wire holder 42 and the penetration part 41.

  In this embodiment, since the mold resin portion 26 is disposed on the inner peripheral side of the position where the lead wire holder 42 is attached, the lead wire 24 routed from the stator 20 to the lead wire holder 42 is covered with a molding resin. Is called. Therefore, the heat radiation effect can be enhanced against the heat generated from the stator covered with the molding resin.

  In the lead wire holder 42 of this embodiment, a peripheral wall 425 surrounding the region where the wiring hole 422 opens is formed on the tip surface of the convex portion 421 where the wiring hole 422 opens. Therefore, when the gap between the lead wire 24 passed through the wiring hole 422 and the wiring hole 422 is filled with the adhesive 426, the adhesive 426 can be prevented from spreading more than necessary. Further, when the molding resin is filled inside the core holder 11, the resin can be prevented from leaking from the wiring hole 422.

  In this embodiment, the fixing member 47 that fixes the pressing member 43 to the lead wire holder 42 is made of metal, and the tip thereof contacts the core holder 11. The fixing member 47 fixes the frame ground terminal 44 together with the pressing member 43. Therefore, since the frame ground terminal 44 and the core holder 11 are electrically connected by the fixing member 47, it is not necessary to use a dedicated component for the attachment of the frame ground terminal 44 and the electrical connection with the core holder 11. Therefore, the number of parts can be reduced.

(Modification)
(1) FIG. 7 is a perspective view of the lead wire 24 and the lead wire take-out portion 40 bound by the heat shrinkable tube 48. When pulling out a plurality of lead wires 24 from the lead wire take-out portion 40, it is desirable to bind the lead wires 24 with a heat shrinkable tube 48. In this case, it is desirable that the heat-shrinkable tube 48 is disposed so as to straddle the edge of the lead wire pressing portion 432. In other words, it is desirable to arrange the heat-shrinkable tube 48 so that only a part of the heat-shrinkable tube 48 is covered with the lead wire pressing portion 432 and the other part is located outside the lead wire pressing portion 432. In this way, the plurality of lead wires 24 can be combined by the heat shrinkable tube 48. Moreover, since the part which contacts the edge of the lead wire holding | suppressing part 432 is protected by the heat contraction tube 48, it can prevent that the lead wire 24 is damaged by the contact with the edge (edge) of a member.

(2) FIG. 8A is a perspective view showing a modified lead wire holder 42A, and FIG. 8B is a perspective view showing a modified 42B. In the lead wire holder 42A shown in FIG. 8A, the shape of the pressing member fixing portion 427 is different from the above-described form. Specifically, wall portions 427d and 472e having the same height as the wall portions 427b and 472c are formed at both ends of the step portion 428, respectively. In this way, the width of the gap G through which the lead wire 24 passes can be narrowed by the walls 427d and 472e. Accordingly, since the lead wires 24 can be prevented from varying in the arrangement direction (Y direction), the lead wires 24 can be pulled out well. Further, the lead wire holder 42B shown in FIG. 8B is obtained by omitting the step portion 428. By omitting the step portion 428, the height of the lead wire 24 can be further suppressed.

(Other variations)
In the above embodiment, the lead wire 24 for feeding power to the drive coil 23 is drawn from the lead wire take-out portion 40, but the use of the lead wire drawn from the lead wire take-out portion 40 is not limited to the power feed wire. Absent. In the above embodiment, the lead wire 24 drawn out in the radial direction of the core holder 11 from the wiring hole 422 penetrating the lead wire holder 42 is bent to the output side L1 and drawn in the axial direction L. It is also possible to bend the wire in the axial direction L. In this case, the lead wire holder 42 may be attached so that the gap G faces the non-output side L2. Alternatively, if the gap G is formed on both the output side L1 and the non-output side L2, it is not necessary to change the direction of the lead wire holder 42 in accordance with the direction in which the lead wire 24 is pulled out.

  Moreover, although the lead wire holder 42 of the said form is provided with the substantially rectangular plate-shaped seat part 423, the planar shape of the seat part 423 is not limited to a rectangle. Further, the planar shape of the pressing member fixing portion 427 is not limited to a rectangle.

The frame ground terminal 44 of the above form is electrically connected to the core holder 11 via a metal fixing member 47 that fixes the pressing member 43, but the connection method of the frame ground terminal 44 is limited to such a configuration. It is not something. For example, one of four metal fixing members 46 for screwing the lead wire holder 42 to the core holder 11 may employ a configuration in which the frame ground terminal 44 is fixed to the core holder 11 together with the lead wire holder 42. it can. In this way, the frame ground terminal 44 can be electrically connected to the core holder 11 via the metal fixing member 46.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor main body, 4 ... Coupling, 5 ... Encoder, 10 ... Motor housing, 11 ... Core holder, 12 ... 1st bearing holder, 13 ... 2nd bearing holder, 14 ... 1st bearing, 15 ... 1st 2 bearings, 16 ... fixing screw, 18 ... recess, 19 ... flange, 20 ... stator, 21 ... stator core, 21A ... split core, 22 ... insulating member, 23 ... drive coil, 24 ... lead wire, 25 ... ground wire, 26 DESCRIPTION OF SYMBOLS ... Mold resin part, 30 ... Rotor, 31 ... Motor side rotating shaft, 32 ... Rotor core, 33 ... Magnet, 34 ... Small diameter part, 40 ... Lead wire extraction part, 41 ... Through part, 42 ... Lead wire holder, 43 ... Presser 44, frame ground terminal, 45, sealing material, 46, fixing member, 47, fixing member, 48, heat shrinkable tube, 51, rotating shaft on encoder side, 52, magnetism Holder, 53 ... Magnet, 54 ... Magnetosensitive element, 55 ... Substrate holder, 56 ... Sensor substrate, 57 ... Sensor cover, 60 ... Encoder cover, 61 ... First cover, 62 ... Second cover, 63 ... Third bearing holder , 64 ... signal line, 65, 66 ... bearing, 100 ... output shaft, 110 ... side face, 111 ... first flat part, 112 ... depression, 113 ... thick part, 120, 130, 140 ... side face, 121 ... flat part , 122 ... heat radiation part, 123 ... thick part, 150 ... concave part, 160 ... fin, 170 ... groove part, 191 ... annular convex part, 192 ... fin, 211 ... annular part, 212 ... salient pole, 213 ... groove-like concave part , 421 ... convex part, 422 ... wiring hole, 423 ... seat part, 424 ... seal groove, 425 ... peripheral wall, 426 ... adhesive, 427 ... holding plate fixing part, 427a, 427b, 427c ... wall part, 427d, 427e ... wall 428 ... Step portion 428a ... Chamfered portion 429 ... Notched portion 431 ... Fixed portion 432 ... Lead wire pressing portion 432b ... Inclined portion 432a ... Center portion G ... Gap, L ... Axial direction, L1 ... Output side, L2 ... Non-output side

Claims (8)

A rotor and a stator;
A motor case that houses the rotor and stator;
A lead wire holder attached to the motor case;
A holding member attached to the lead wire holder,
The lead wire holder includes a seat that contacts the motor case, and a pressing member fixing portion that is formed integrally with the seat.
The motor, wherein the pressing member includes a lead wire pressing portion facing a wiring hole penetrating the lead wire holder. The motor case includes a cylindrical portion surrounding the rotor and the outer peripheral side of the stator,
The lead wire holder is attached to the cylindrical portion,
The motor according to claim 1, wherein a plurality of the wiring holes are arranged in a direction orthogonal to the axial direction of the cylindrical portion. A heat shrinkable tube for binding a plurality of lead wires passed through the plurality of wiring holes;
The motor according to claim 2, wherein a part of the heat-shrinkable tube is covered with the pressing member, and a part other than the part is located outside the pressing member. The seat is plate-shaped,
The pressing member fixing portion is a wall portion that protrudes from the seat portion and surrounds the outer periphery of the wiring hole,
On a part of the wall portion in the circumferential direction, a stepped portion having a protruding height from the seat portion lower than other portions is formed,
The motor according to any one of claims 1 to 3, wherein a gap through which the lead wire passes is provided between the stepped portion and the lead wire pressing portion. The lead wire holder includes a convex part that fits into a through part formed in the motor case,
The motor according to any one of claims 1 to 4, wherein a mold resin portion that covers the stator is provided on an inner periphery of the motor case.   The motor according to claim 5, wherein the mold resin portion is disposed on an inner peripheral side of a position where the lead wire holder is attached. The wiring hole is opened at a front end surface of the convex portion, and a peripheral wall surrounding a region where the wiring hole is opened is formed on the front end surface,
The motor according to claim 5, further comprising an adhesive disposed in a gap between the lead wire passed through the wiring hole and the wiring hole. A fixing member for fixing the pressing member or the lead wire holder to the motor case;
The motor according to any one of claims 1 to 7, further comprising a frame ground terminal electrically connected to the motor case via the fixing member.

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