JP2016208783A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which efficiently makes electric connection between a ground terminal and a stator core.SOLUTION: In a motor 1, a power supply part 8 is provided on an outer peripheral side of a metal core holder 4 which holds a stator core 5 at an inner side. In the power supply part 8, power supply terminals 87, which are electrically connected to the stator coil 6 through a wiring member 86, and a ground terminal 88 are held by a metal terminal holder 80. The ground terminal 88 is electrically connected to the terminal holder 80, and the terminal holder 80 is fixed to the core holder 4 while in contact with the core holder 4. Therefore, the ground terminal 88 is electrically connected to the stator core 5 through the terminal holder 80 and the core holder 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor in which a power feeding portion is provided on the outer peripheral side of a stator.

  In a motor, as a configuration for supplying power to a stator coil wound around a salient pole of a stator core, a configuration is proposed in which a connector member is attached to the outer peripheral side of the stator and the stator coil is connected to a power supply terminal held by the connector member. ing. In that case, one end of a wiring member such as a lead wire is connected to the ground terminal held by the connector member, and the other end of the wiring member is connected to the stator core via a bolt or the like (see Patent Document 1).

Japanese Patent Laid-Open No. 11-289702

  However, in the configuration in which the ground terminal held by the connector member is connected to the stator core via a wiring member such as a lead wire as in the configuration described in Patent Document 1, it takes a lot of time to assemble the motor. There is.

  In view of the above problems, an object of the present invention is to provide a motor capable of efficiently and electrically connecting a ground terminal and a stator core.

  In order to solve the above problems, a motor according to the present invention includes a rotor, a stator core that surrounds the rotor in a radially outer side, a stator coil wound around the stator core, and the stator core in contact with the stator core from the radially outer side. A stator having a cylindrical metal core holder for holding the power supply, and a power feeding portion provided on the outer peripheral side of the core holder, and the power feeding portion is electrically connected to the stator coil via a wiring member. A power supply terminal connected, a ground terminal, and a metal terminal holder that holds the ground terminal and the power supply terminal and is fixed to the core holder in contact with the core holder, and the ground terminal is It is electrically connected to the core holder via the terminal holder.

  In the present invention, since the ground terminal and the metal terminal holder are electrically connected to each other in the power feeding unit, if the terminal holder is fixed so as to contact the metal core holder, a wiring member such as a lead wire is used. Even if not, the ground terminal and the stator core can be electrically connected. Therefore, the electrical connection between the ground terminal and the stator core can be efficiently performed.

  In the present invention, the terminal holder is coupled to the first holder made of metal that holds the power supply terminal and the ground terminal, the first holder in contact with the first holder, and in contact with the core holder. A metal second holder fixed to the core holder, wherein the power supply terminal is held by the first holder in an insulated state from the first holder, and the ground terminal is electrically connected to the first holder. The aspect currently hold | maintained at the said 1st holder in the state connected to can be employ | adopted.

In this case, an annular first sealing member is disposed between the first holder and the second holder, the surface of the first holder on the second holder side, and the first holder of the second holder. It is preferable that a first convex portion protruding so as to be in contact with the other is formed in a frame shape on one side of the side so as to be along the first seal member inside or outside the first seal member. According to such a configuration, even when the space between the first holder and the second holder is sealed, the first holder and the second holder can be reliably brought into contact with each other.

  In the present invention, the terminal holder includes a bottom wall formed with a hole through which the wiring member passes. The core holder has an opening through which the wiring member passes. The opening is closed by the bottom wall. It is preferable to adopt a mode of peeling.

  In the present invention, it is preferable that the bottom wall is a convex portion in which a portion where the hole is formed protrudes into the opening. Such a configuration is suitable for closing the opening. Moreover, since the part in which the hole is formed is a convex part, the space which arrange | positions a wiring member within a terminal holder is large. Therefore, the wiring member can be pulled out to the core holder side without forcibly bending.

  In the present invention, the hole is preferably closed by the wiring member.

  In the present invention, it is preferable that the stator core and the stator coil are covered with a mold resin portion filled inside the core holder. According to this configuration, the heat generated in the stator coil can be efficiently released.

  In the present invention, a groove extending in an annular shape so as to surround the opening is formed on one of a surface of the bottom wall on the core holder side and a surface overlapping the bottom wall of the core holder. It is preferable that an annular second seal member is disposed. According to such a configuration, it is possible to seal between the terminal holder and the core holder.

  In the present invention, on one of the surface of the bottom wall on the core holder side and the surface overlapping the bottom wall of the core holder, a second convex portion protruding so as to be in contact with the other is formed inside the second seal member. It is preferable that it is formed in a frame shape along the second seal member. According to such a configuration, even when the gap between the terminal holder and the core holder is sealed, the terminal holder and the core holder can be reliably brought into contact with each other.

  In the present invention, a third convex portion protruding so as to come into contact with the other of the surface of the bottom wall on the core holder side and the surface overlapping the bottom wall of the core holder is outside the second seal member. It is preferable that it is formed in a frame shape along the second seal member. According to such a configuration, even when the gap between the terminal holder and the core holder is sealed, the terminal holder and the core holder can be reliably brought into contact with each other.

  In the present invention, an insulating first coating film is formed on the outer peripheral surface of the core holder, and the terminal holder is in contact with a portion of the outer peripheral surface of the core holder exposed from the first coating film. And is preferably fixed to the core holder. According to such a configuration, even when an insulating coating film is formed on the outer peripheral surface of the core holder, the core holder and the terminal holder can be electrically connected.

  In the present invention, an insulating second coating film is formed on the second holder, and the first holder is in contact with a portion exposed from the second coating film of the second holder. Preferably, the second holder is fixed to the second holder, and a portion of the second holder that is exposed from the second coating film is in contact with the core holder.

  In the present invention, since the ground terminal and the metal terminal holder are electrically connected to each other in the power feeding unit, if the terminal holder is fixed so as to contact the metal core holder, a wiring member such as a lead wire is used. Even if not, the ground terminal and the stator core can be electrically connected. Therefore, the electrical connection between the ground terminal and the stator core can be efficiently performed.

It is the perspective view which looked at the motor to which the present invention is applied from the output side. It is sectional drawing which shows a mode that the motor to which this invention was applied was cut | disconnected in the position which passes along a motor axis line. It is a disassembled perspective view of the motor to which this invention is applied. It is a perspective view in the state where a stator core etc. were removed from a core holder in a stator used for a motor to which the present invention is applied. It is the perspective view which looked at a part of the circumferential direction of the stator core shown in FIG. 4 from radial direction outer side. It is the perspective view which looked at a part of the circumferential direction of the stator core shown in FIG. 4 from radial direction inner side. It is explanatory drawing of the electric power feeding part of the motor to which this invention is applied. It is explanatory drawing of the mold resin part provided in the motor to which this invention is applied.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(overall structure)
FIG. 1 is a perspective view of a motor 1 to which the present invention is applied as viewed from the output side. FIGS. 1A and 1B are a perspective view of the entire motor 1 and a state in which a power feeding unit 8 is removed from the motor body. FIG. FIG. 2 is a cross-sectional view showing a state in which the motor 1 to which the present invention is applied is cut at a position passing through the motor axis. FIG. 3 is an exploded perspective view of the motor 1 to which the present invention is applied. In addition, illustration of the mold resin part 7 is abbreviate | omitted in FIG.

  The motor 1 shown in FIGS. 1, 2 and 3 is a permanent magnet type synchronous motor. The motor 1 includes a rotor 2 and a cylindrical stator 3 that surrounds the rotor 2 on the outer side in the radial direction. The rotor 2 rotates with a rotating shaft 20 that extends in the axial direction L (motor axial direction). A cylindrical rotor core 22 fixed around the shaft 20 and a rotor magnet 23 fixed to the outer peripheral surface of the rotor core 22 are provided. In this embodiment, the rotor magnet 23 is made of a rare earth magnet, and the rotor core 22 is made of an iron-based metal.

  The stator 3 is in contact with the stator core 5, which will be described later with reference to FIGS. 4, 5 and 6, the stator coil 6 wound around each of the plurality of salient poles 51 of the stator core 5, and the stator core 5 from the outside in the radial direction. And a cylindrical core holder 4 that holds the stator core 5, and the core holder 4 constitutes a motor case. The core holder 4 is made of metal, and in this embodiment, the core holder 4 is made of aluminum. The core holder 4 has a substantially rectangular shape on the outer peripheral side, but has a cylindrical shape on the inner side. A heat dissipation fin 48 is formed on the outer peripheral surface of the core holder 4. An insulating first coating 39 is formed on the outer peripheral surface of the core holder 4. The core holder 4 having such a configuration is manufactured by, for example, performing electrodeposition coating after manufacturing the core holder 4 and then removing the first coating film 39 from a predetermined position by post-processing. In the present embodiment, the first coating film 39 is a black coating film. In this embodiment, the stator 3 has a mold resin portion 7 (see FIG. 2) that covers the stator coil 6 and the stator core 5 inside the core holder 4.

The first plate 11 is fixed to the end of the core holder 4 on the output side in the axial direction L, and the first plate 11 holds a first bearing 16 that rotatably supports the rotary shaft 20. In this embodiment, the first plate 11 has a through hole 1 that causes the rotary shaft 20 to protrude toward the output side.
10, a substantially rectangular end plate portion 111, an outer cylindrical portion 112 projecting from the outer edge of the end plate portion 111 toward the non-output side, and a non-output side radially inward from the outer cylindrical portion 112. And a first bearing 16 formed of a ball bearing is provided between the inner peripheral cylindrical portion 113 and the rotary shaft 20. A stepped portion 114 is formed at the end on the counter-output side of the outer peripheral side cylindrical portion 112 to project the radially inner portion to the counter-output side. The first plate 11 is fixed to the core holder 4 with screws in a state where the stepped portion 114 is fitted inside the core holder 4. The first plate 11 is made of a metal material such as aluminum, and an insulating coating film 119 similar to the first coating film 39 is provided around the outer peripheral surfaces of the end plate portion 111 and the outer cylindrical portion 112 and the through hole 110. Is formed. However, it is avoided that the coating film 119 reduces the dimensional accuracy in a portion that becomes a positioning surface when the motor 1 is mounted on a motor device (not shown), such as an end surface on one side L1 of the end plate portion 111. Therefore, the coating film 119 is not formed. The first plate 11 having such a configuration is manufactured by, for example, performing electrodeposition coating after the first plate 11 is manufactured, and then removing the coating film 119 from a predetermined position by post-processing.

  The second plate 12 is fixed to the opposite end of the core holder 4 in the axial direction L, and the encoder cover 99 is fixed to the opposite end of the second plate 12. The second plate 12 holds a second bearing 17 that rotatably supports the rotary shaft 20. In this embodiment, the second plate 12 protrudes from the outer edge of the end plate portion 121 toward the output side, with a substantially rectangular end plate portion 121 formed with a through hole 120 that protrudes the rotary shaft 20 to the opposite output side. The outer peripheral side cylindrical portion 122 and the inner peripheral side cylindrical portion 123 that protrudes radially inward from the outer peripheral side cylindrical portion 122 toward the opposite output side. A second bearing 17 composed of a ball bearing is provided between them. A step portion 124 is formed at the output-side end portion of the outer cylindrical portion 122 to project the radially inner portion to the output side. The second plate 12 is fixed to the core holder 4 with screws with the stepped portion 124 fitted inside the core holder 4. The second plate 12 is made of a metal material such as aluminum, and an insulating coating 129 similar to the first coating 39 is formed on the outer peripheral surfaces of the end plate 121 and the outer cylindrical portion 122. The coating film 129 is also formed by electrodeposition coating, like the first coating film 39 and the coating film 119.

  An encoder 9 that detects the rotational position of the rotary shaft 20 is provided inside the encoder cover 99. In this embodiment, the encoder 9 is magnetic, and a sensor magnet 92 attached to the end of the rotating shaft 20 on the counter-output side via a magnet holder 91 and the MR opposite to the sensor magnet 92 on the counter-output side. And a magnetosensitive element 93 such as an element. The magnetosensitive element 93 is held by a sensor substrate 94, and the sensor substrate 94 is fixed to a sensor cover 98 fixed to the second plate 12. A sensor output connector 97 that outputs a detection result of the encoder 9 is provided on a side surface of the encoder cover 99. In this embodiment, the encoder cover 99 is made of black resin.

(Configuration of stator 3)
FIG. 4 is a perspective view of the stator 3 used in the motor 1 to which the present invention is applied with the stator core 5 and the like removed from the core holder 4. 5 is a perspective view of a part of the stator core 5 shown in FIG. 4 in the circumferential direction as seen from the outside in the radial direction. FIGS. 5A and 5B are perspective views of the stator core 5 with an insulating member attached thereto. FIG. 3 is a perspective view of the stator core 5 with an insulating member removed. 6 is a perspective view of a portion of the circumferential direction of the stator core 5 shown in FIG. 4 as viewed from the inside in the radial direction, and FIGS. 6A and 6B are perspective views of the stator core 5 with an insulating member attached thereto. FIG. 3 is a perspective view of the stator core 5 with an insulating member removed.

As shown in FIGS. 4, 5, and 6, in the stator 3 used in the motor 1 of this embodiment, the stator core 5 includes an annular portion 56 and a plurality of salient poles protruding radially inward from the annular portion 56. 51. In this embodiment, the stator core 5 includes a plurality of divided cores 50 in which the annular portion 56 is divided in the circumferential direction for each salient pole 51, and the split core 50 includes the salient pole 51 and the radial direction of the salient pole 51. And an outer peripheral arc portion 54 that protrudes in an arc shape from both ends in the circumferential direction. Stator core 5 (divided core 50) is formed of a laminated core in which a plurality of silicon steel plates are laminated.

  The salient pole 51 has a trunk portion 52 extending in the radial direction, and an inner circumferential arc portion 53 that projects from the radially inner end of the trunk portion 52 to both sides in the radial direction. The divided cores 50 thus configured are fixed by shrink fitting inside the core holder 4 in a state where a plurality of divided cores 50 are arranged in the circumferential direction. At that time, the outer circumferential arc portions 54 of the split cores 50 adjacent to each other in the circumferential direction are in contact with each other to form an annular portion 56. Further, the inner circumferential side arc portions 53 of the split cores 50 adjacent in the circumferential direction are in contact with each other to form the inner circumferential surface 30 of the stator 3.

  Here, a convex portion 541 extending in the entire axial direction L is formed at one end portion in the circumferential direction of the outer circumferential arc portion 54, and the other end portion of the outer circumferential arc portion 54 in the circumferential direction is formed. Is formed with a recess 542 extending in the entire axial direction L. For this reason, the convex part 541 formed in the outer peripheral side arc part 54 of the split core 50 fits into the concave part 542 formed in the outer peripheral side arc part 54 of the adjacent split core 50 on one side in the circumferential direction, whereas the split core The convex part 541 formed in the outer peripheral side arc part 54 of the division | segmentation core 50 adjacent on the other side of the circumferential direction fits into the recessed part 542 formed in the outer peripheral side arc part 54 of 50.

  In the present embodiment, the outer peripheral surface of the annular portion 56 of the stator core 5 (the outer peripheral side arc portion 54 of the split core 50) extends from the end on one side L1 in the axial direction L of the stator core 5 to the end on the other side. A groove-like recess 55 is formed. In this embodiment, the groove-like recess 55 and the salient pole 51 are provided at the same angular position (center in the circumferential direction) of the stator core 5. Further, as shown in FIG. 5B, the groove-shaped recess 55 has a circumferential dimension that decreases from the opening edge 551 side positioned on the radially outer side toward the bottom portion 552 positioned on the radially inner side.

(Configuration of insulation member)
As shown in FIGS. 5 and 6, when winding the stator coil 6 around the stator core 5, the first insulating member 61 is attached to the end portion on the one side L <b> 1 in the axial direction L of the stator core 5 (divided core 50). The second insulating member 62 is overlaid on the end of the other side L2 in the axial direction L of the stator core 5 (divided core 50), and the stator coil 6 is wound around the salient pole 51 in this state. In that case, it is preferable to interpose an insulating sheet (not shown) between the stator core 5 and the first insulating member 61 and between the stator core 5 and the second insulating member 62. The first insulating member 61 and the second insulating member 62 have the same configuration, and are disposed so as to overlap the stator core 5 with their directions reversed. Therefore, hereinafter, the configuration of the first insulating member 61 will be mainly described, and the description of the second insulating member 62 will be omitted. In this embodiment, the first insulating member 61 and the second insulating member 62 are made of a resin material such as PET (polyethylene terephthalate).

  The first insulating member 61 protrudes from the radially outer portion of the end plate 63 to the opposite side of the stator core 5 in the axial direction L from the radially outer portion of the end plate 63 and overlaps the salient pole 51 in the axial direction L. The outer plate 64 that restricts the turning range radially outward, and the end plate 63 protrudes from the radially inner end to the opposite side of the stator core 5 in the axial direction L, and the winding range of the stator coil 6 is set in the radial direction. And an inner plate portion 65 that is regulated on the inner side. The first insulating member 61 has plate portions 60 that overlap the side surfaces of the salient poles 51 on both sides of the end plate portion 63 in the circumferential direction.

In the outer plate 64, at the end located on the opposite side of the stator core 5 in the axial direction L, the stator core 5 is provided in addition to the groove 69 for passing the winding start line and winding end line of the stator coil 6. A first recess 66 that is recessed toward the side to be positioned is formed. In addition, a second recess 67 that is recessed toward the radially inner side is formed on the radially outer surface of the outer plate portion 64. In this embodiment, the first recess 66 and the second recess 67 are provided at the same angular position (center in the circumferential direction) as the groove-like recess 55.

  The first insulating member 61 includes a plate-like projecting portion 68 that protrudes radially outward from the outer plate portion 64 and overlaps the annular portion 56, and is disposed at the radially outer end of the plate-like projecting portion 68. A third recess 680 is formed that is recessed radially inward at the same angular position (circumferential center) as the groove-like recess 55.

  Further, in the inner plate portion 65 of the first insulating member 61, a notch 650 is formed at a boundary portion with the plate portion 60. For this reason, the length in the circumferential direction of the portion overlapping the radial inner end (inner circumferential arc portion 53) of the salient pole 51 from the one side L1 in the axial direction L is the radial inner end (inner The circumferential arc 53) is shorter than the circumferential length.

(Configuration of power supply unit 8)
7A and 7B are explanatory views of the power feeding unit 8 of the motor 1 to which the present invention is applied. FIGS. 7A and 7B are perspective views of the state in which the power feeding unit 8 is attached to the core holder 4 as viewed from the inside of the core holder 4. FIG. 3 is a perspective view of the state in which the power feeding unit 8 is removed from the core holder 4 as viewed from the inside of the core holder 4.

  As shown in FIGS. 1, 2, and 7, in the motor 1 of this embodiment, a power feeding unit 8 is configured on the outer peripheral side of the core holder 4. In this embodiment, the power feeding section 8 is electrically connected to each of a plurality of stator coils 6 (U-phase, V-phase, and W-phase) of the stator 3 via wiring members 86 made of lead wires or the like. The power supply terminal 87 for the main (U phase, V phase, and W phase), one ground terminal 88, and a metal terminal holder 80 that holds the ground terminal 88 and the power supply terminal 87 are provided. The holder 80 is fixed to the outer peripheral surface of the core holder 4.

  In this embodiment, the terminal holder 80 includes a first metal holder 81 that holds the power supply terminal 87 and the ground terminal 88, and a second metal holder 82 that is coupled to the first holder 81. The second holder 82 is fixed to the outer peripheral surface of the core holder 4. The first holder 81 is fixed with screws 819 in contact with the second holder 82, and the second holder 82 is fixed with screws 829 in contact with the outer peripheral surface of the core holder 4. In this embodiment, both the first holder 81 and the second holder 82 are made of aluminum.

  The first holder 81 is a metal connector housing that holds the ground terminal 88 and the power supply terminal 87 inside the first cylindrical portion 811 that opens toward the radially outer side (the side opposite to the side where the core holder 4 is located). In addition, inside the first cylindrical portion 811, each of the ground terminal 88 and the power feeding terminal 87 has one end portion directed radially outward (the side opposite to the side where the core holder 4 is located). The first holder 81 has a second cylindrical portion 812 that protrudes radially inward (side on which the core holder 4 is located). Inside the second cylindrical portion 812, the ground terminal 88 and the power supply terminal 87 are held by the insulator 814, and each of the ground terminal 88 and the power supply terminal 87 protrudes from the insulator 814 toward the core holder 4. Yes. The first holder 81 has a rectangular flange portion 813 between the first cylindrical portion 811 and the second cylindrical portion 812, and the flange portion 813 is fixed to the second holder 82 with a screw 819.

The second holder 82 is a substantially rectangular parallelepiped metal part having a circular opening 820 that opens radially outward (opposite to the side on which the core holder 4 is located). Two cylindrical portions 812 are fitted. On the outer surface in the radial direction of the second holder 82 (on the side opposite to the side on which the core holder 4 is located), a first frame portion 821 where the first holder 81 overlaps around the opening 820, and the first frame portion 821 A second frame portion 822 surrounding the periphery is formed, and the first frame portion 821 is one step higher than the second frame portion 822. A through hole 824 is formed in the second frame portion 822 of the second holder 82, and a screw 829 is passed through the through hole 824 so that the core holder 4
If the screw 829 is stopped, the second holder 82 is fixed to the core holder 4.

  In this embodiment, an insulating second coating film 89 is also formed on the terminal holder 80. More specifically, an insulating second coating film 89 is formed on the side surface of the second holder 82 and the second frame portion 822. However, in the 2nd holder 82, the 2nd coating film 89 is not formed in the 1st frame part 821 with which the 1st holder 81 overlaps, and the part which faces the core holder 4 side. In the present embodiment, the second coating film 89 is a black coating film like the first coating film 39. The first holder 81 having such a configuration is manufactured by, for example, performing electrodeposition coating after the first holder 81 is manufactured and then removing the second coating film 89 from a predetermined position by post-processing.

  In this embodiment, the core holder 4 has an opening 45 through which the wiring member 86 is passed. On the other hand, as shown in FIG. 2B, the terminal holder 80 includes a bottom wall 825 in which a hole 828 for passing the wiring member 86 is formed, and the opening 45 is blocked by the bottom wall 825. It is. More specifically, the second holder 82 has a bottom wall 825 in which a hole 828 for passing the wiring member 86 is formed, and the opening 45 of the core holder 4 is closed by the bottom wall 825 of the second holder 82. It is peeling off. In this embodiment, the bottom wall 825 is a convex portion 826 where a portion where the hole 828 is formed protrudes into the opening 45, and the opening 45 of the core holder 4 is a convex portion of the second holder 82. It is blocked by 826. Further, the inner diameter of the hole 828 is the same size as the outer diameter of the wiring member 86 or slightly larger than the outer diameter of the wiring member 86 due to the protrusion 827 formed in the hole 828. For this reason, the hole 828 is closed by the wiring member 86.

(Electrical connection between the ground terminal 88 and the core holder 4)
In the present embodiment, as will be described below, the three power supply terminals 87 and the three-phase (U-phase, V-phase, and W-phase) stator coils 6 are connected via wiring members 86, respectively. The wiring member 86 is not used for electrical connection between the ground terminal 88 and the core holder 4 (stator core 5). For this reason, only three holes 828 are formed in the bottom wall 825 of the terminal holder 80 (second holder 82).

  More specifically, all of the three power supply terminals 87 are held in an insulated state by the metal terminal holder 80 (metal first holder 81), but the ground terminal 88 is connected to the terminal holder 80 ( The first holder 81) is electrically connected to the terminal holder 80 (first holder 81). The first holder 81 is fixed to the second holder 82 so as to be in contact with the metal second holder 82. The second holder 82 is fixed to the core holder 4 so as to be in contact with the metal core holder 4. Therefore, the ground terminal 88 is electrically connected to the stator core 5 via the first holder 81, the second holder 82, and the core holder 4 without using the wiring member 86.

  As shown in FIG. 1B, an insulating first coating 39 is formed on the core holder 4, but the first coating 39 is not formed around the opening 45. For this reason, the terminal holder 80 is fixed to the core holder 4 so as to be in contact with the portion 390 exposed from the first coating film 39 on the outer peripheral surface of the core holder 4. In addition, an insulating second coating film 89 is formed on the side surface of the second holder 82, but the second coating film 89 is not formed on the first frame portion 821 that overlaps the first holder 81. For this reason, the 2nd holder 82 is being fixed to the 2nd holder 82 in the state which touches the part exposed from the 2nd coating film 89 of the 1st holder 81. FIG. Further, the second coating film 89 is not formed on the surface of the bottom wall 825 in contact with the core holder 4 in the second holder 82 on the core holder 4 side. For this reason, the second holder 82 is fixed to the core holder 4 with the portion exposed from the second coating film 89 in contact with the core holder 4.

(Seal structure in the power feeding section 8)
As shown in FIG. 2A, an annular first seal member 801 is disposed between the first holder 81 and the second holder 82. The first seal member 801 is made of a rubber O-ring or the like. In addition, on one of the surface on the second holder 82 side of the first holder 81 and the surface on the first holder 81 side of the second holder 82, a first convex portion 806 protruding so as to be in contact with the other is a first seal member. It is formed in a frame shape along the first seal member 801 on the inner side or the outer side of 801. In this embodiment, as a result of the second holder 82 being an annular step portion in which the inner edge of the opening 820 is disposed with the first seal member 801, the first frame portion 821 is located outside the first seal member 801. A first convex portion 806 extending in a frame shape along the one seal member 801 is in contact with the first holder 81. Therefore, in the present embodiment, the first seal member 801 and the first convex portion 806 prevent moisture and the like from entering the inside, and the first holder 81 has the first convex portion with respect to the second holder 82. At 806, they are in contact and electrically connected. The first convex portion 806 may be formed on the first holder 81 side.

  Further, as shown in FIG. 2 (b), one of the surface on the core holder 4 side of the bottom wall 825 of the terminal holder 80 (the bottom wall 825 of the second holder 82) and the surface overlapping the bottom wall 825 of the core holder 4 A groove 805 extending in an annular shape is formed so as to surround the opening 45, and an annular second seal member 802 is disposed in the groove 805. The second seal member 802 is made of a rubber O-ring or the like. In this embodiment, the groove 805 is formed on the core holder 4 side surface of the bottom wall 825 of the second holder 82. Further, a second wall projecting so as to be in contact with one of the surface on the core holder 4 side of the bottom wall 825 of the terminal holder 80 (the bottom wall 825 of the second holder 82) and the surface overlapping the bottom wall 825 of the core holder 4. The convex portion 807 is formed in a frame shape so as to be along the second seal member 802 inside the second seal member 802. Further, a third wall projecting to contact one of the surface of the bottom wall 825 of the terminal holder 80 (the bottom wall 825 of the second holder 82) on the core holder 4 side and the surface overlapping the bottom wall 825 of the core holder 4 is in contact with the other. The convex portion 808 is formed in a frame shape along the second seal member 802 on the outside of the second seal member 802.

  In the present embodiment, the second convex portion 807 and the third convex portion 808 are formed on the surface of the bottom wall 825 of the terminal holder 80 (the bottom wall 825 of the second holder 82) on the core holder 4 side and are in contact with the core holder 4. . Therefore, in this embodiment, the second seal member 802, the second convex portion 807, and the third convex portion 808 prevent moisture and the like from entering the inside, and the terminal holder 80 (second holder 82) The second convex portion 807 and the third convex portion 808 are in contact with and electrically connected to the core holder 4. Note that the second convex portion 807 and the third convex portion 808 may be formed on the core holder 4 side.

(Main effect of this form regarding ground connection)
As described above, in the motor 1 of the present embodiment, since the ground terminal 88 and the metal terminal holder 80 are electrically connected in the power feeding unit 8, the terminal holder 80 is in contact with the metal core holder 4. If fixed in this manner, the ground terminal 88 and the stator core 5 can be electrically connected without using a wiring member 86 such as a lead wire. Therefore, the electrical connection between the ground terminal 88 and the stator core 5 can be performed efficiently. Further, in the bottom wall 825 of the terminal holder 80, the portion where the hole 828 is formed is a convex portion 826 that protrudes into the opening 45, so that the space in which the wiring member 86 is arranged in the terminal holder 80. Is wide. Accordingly, the wiring member 86 can be pulled out to the core holder 4 side without forcibly bending it, so that the wiring member 86 is unlikely to be disconnected.

  In addition, the insulating first coating 39 is formed on the outer peripheral surface of the core holder 4, but the terminal holder 80 is in contact with the portion 390 exposed from the first coating 39 on the outer peripheral surface of the core holder 4. ing. For this reason, even when the insulating first coating film 39 is formed on the outer peripheral surface of the core holder 4, the core holder 4 and the terminal holder 80 can be electrically connected.

  The terminal holder 80 includes a metal first holder 81 and a metal second holder 82, but the ground terminal 88 is electrically connected to the first holder 81 in the first state. The holder 81 is held, and the first holder 81 and the second holder 82 are electrically connected. For this reason, the ground terminal 88 can be electrically connected to the core holder 4 via the first holder 81 and the second holder 82 by electrically connecting the second holder 82 to the core holder 4. In addition, an insulating second coating film 89 is formed on the second holder 82, but the first holder 81 is in contact with a portion of the second holder 82 exposed from the second coating film 89. The second holder 82 is fixed to the core holder 4 such that a portion exposed from the second coating film 89 is in contact with the core holder 4. For this reason, even when the insulating second coating film 89 is formed on the outer peripheral surface of the second holder 82, the ground terminal 88 is electrically connected to the core holder 4 via the first holder 81 and the second holder 82. can do.

  An annular first seal member 801 is disposed between the first holder 81 and the second holder 82. Further, the second holder 82 is formed with a first convex portion 806 that contacts the first holder 81. For this reason, it is possible to prevent moisture and the like from entering between the first holder 81 and the second holder 82. Further, since the first holder 81 and the second holder 82 are in contact with each other via the first convex portion 806, even when the first seal member 801 is sealed between the first holder 81 and the second holder 82. The first holder 81 and the second holder 82 can be reliably electrically connected. In addition, since the first holder 81 and the second holder 82 are in contact with each other via the first convex portion 806, a situation in which electrical connection is hindered due to the presence of foreign matter is unlikely to occur.

  A second seal member 802 is disposed between the bottom wall 825 of the terminal holder 80 and the core holder 4. In addition, the terminal holder 80 (second holder 82) is formed with a second convex portion 807 and a third convex portion 808 in contact with the core holder 4 on the inner side and the outer side of the second seal member 802. For this reason, it can suppress that a water | moisture content etc. penetrate | invade from between the terminal holder 80 (2nd holder 82) and the core holder 4. FIG. Further, since the terminal holder 80 (second holder 82) and the core holder 4 are in contact with each other via the second convex portion 807 and the third convex portion 808, the second seal member 802 is used between the second holder 82 and the core holder 4. Even when sealing is performed, the terminal holder 80 (second holder 82) and the core holder 4 can be reliably electrically connected. In addition, since the terminal holder 80 (second holder 82) and the core holder 4 are in contact with each other via the second convex portion 807 and the third convex portion 808, it is difficult to cause a situation in which electrical connection is hindered by the presence of foreign matter. .

(Configuration of mold resin part 7)
FIG. 8 is an explanatory diagram of the mold resin portion 7 provided in the motor 1 to which the present invention is applied. FIGS. 8A, 8B, and 8C are explanatory diagrams of the resin molding process, in which the resin is molded. It is explanatory drawing which shows the range which is, and explanatory drawing which expands and shows the range in which resin is molded. In FIG. 8C, only a part of the mold resin portion 7 is shown so that the state before and after the resin is molded can be easily understood. 8B and 8C are explanatory views of the stator core 5 as viewed from one side L1 in the axial direction L. The stator core 5 has a configuration in which one side L1 and the other side L2 in the axial direction are substantially the same. have. Therefore, in FIGS. 8B and 8C, reference numerals indicating the configuration of the other side L2 of the stator core 5 in the axial direction L are shown in parentheses.

  In the present embodiment, as shown in FIG. 8A, the first insulating member 61 and the second insulating member 62 are attached to the stator core 5 (the divided core 50), and then described with reference to FIGS. The stator coil 6 is wound between the outer plate portion 64 and the inner plate portion 65, and then the stator core 5 (divided core 50) is shrink-fitted with the plurality of divided cores 50 arranged in the circumferential direction. Secure inside. In that case, the core holder 4 is provided with the power feeding portion 8, and the stator coil 6 and the power feeding terminal 87 are electrically connected by the wiring member 86.

Next, in a state where the mold 19 is disposed inside the stator core 5, as indicated by an arrow R, the mold is interposed between the mold 19 and the core holder 4 from the other side L 2 (counter output side) in the axial direction L. Fill with resin. In this embodiment, as the resin for molding, for example, BMC (Bulk Molding
Compound). Such BMC is a resin material in which an unsaturated polyester resin, a filler such as calcium carbonate, and glass fiber are mixed.

  In such a filling step, the gate is disposed at a position where the stator coil 6 is wound around the second insulating member 62. More specifically, the gate is on the stator coil 6 between the outer plate portion 64 and the inner plate portion 65 and is the same as the first recess 66, the second recess 67, the third recess 680, and the groove-shaped recess 55. It is provided so that it may become the angle position. As a result, the resin flows between the groove-shaped recess 55 and the slot 59 of the stator core 5 and flows from the other side L2 (non-output side) in the axial direction L to the one side L1 (output side). Therefore, the stator coil 6 located on the other side L2 in the axial direction L of the stator core 5 is covered with resin, the stator coil 6 located in the slot 59 of the stator core 5 is covered with resin, and further, the axial direction of the stator core 5 The stator coil 6 located on one side L1 of L is covered with resin.

  Accordingly, when the resin is solidified, the stator core 5 and the stator coil 6 are covered with the mold resin portion 7 inside the core holder 4 as shown in FIGS. 2B, 8B, and 8C. Become. The mold resin portion 7 includes a first portion 71 that covers the stator coil 6 on one side L1 in the axial direction L of the stator core 5, and a second portion 72 that covers the stator coil 6 on the other side L2 in the axial direction L of the stator core 5. And the stator coil 6 is covered in the slot 59 sandwiched between the third portion 73 connected to the first portion 71 and the second portion 72 inside the groove-like recess 55 and the salient pole 51 adjacent in the circumferential direction. The first portion 71 and the fourth portion 74 connected to the second portion 72 are provided.

  The mold resin portion 7 is in a state where at least one of the first portion 71 and the second portion 72 is in contact with the inner peripheral surface 40 of the core holder 4. In this embodiment, the mold resin portion 7 is in a state where both the first portion 71 and the second portion 72 are in contact with the inner peripheral surface 40 of the core holder 4. Further, in the mold resin portion 7, the third portion 73 is also in contact with the inner peripheral surface 40 of the core holder 4.

  The first insulating member 61 is formed with the first concave portion 66, the second concave portion 67, and the third concave portion 680 described with reference to FIGS. 5 and 6, and therefore from the other side L2 in the axial direction L. The filled mold resin easily flows from the outer plate portion 64 and the inner plate portion 65 to the outer side in the radial direction of the outer plate portion 64 through the first concave portion 66, the second concave portion 67 and the third concave portion 680. Therefore, the resin easily flows through the groove-shaped recess 55 of the stator core 5 to one side L1 (output side) of the stator core 5 in the axial direction L.

  When performing such a filling process, the opening 45 of the core holder 4 is closed by the bottom wall 825 of the terminal holder 80 (second holder 82).

(Main effect of this form on resin mold)
As described above, in the present embodiment, the groove-like recess 55 extending from the end portion on the one side L1 in the axial direction L of the stator core 5 to the end portion on the other side is formed on the outer peripheral surface of the annular portion 56 of the stator core 5. Therefore, the molding resin filled from the other side L2 in the axial direction L passes through the groove-shaped recess 55 of the stator core 5 and reaches one side L1 in the axial direction L. Therefore, in the mold resin portion 7, the second portion 72 covers the stator coil 6 on the other side L <b> 2 in the axial direction L of the stator core 5, and the first portion 71 is on the one side L <b> 1 in the axial direction L of the stator core 5. Cover.

  Further, the molding resin filled from the other side L2 in the axial direction L passes through the slot 59 of the stator core 5 and reaches the one side L1 in the axial direction L. Therefore, in the mold resin portion 7, the second portion 72 covers the stator coil 6 on the other side L <b> 2 in the axial direction L of the stator core 5, and the first portion 71 is on the one side L <b> 1 in the axial direction L of the stator core 5. Cover.

  Therefore, the heat generated in the stator coil 6 can be efficiently released to the first portion 71 and the second portion 72 of the mold resin portion 7, and the heat transmitted from the stator coil 6 to the mold resin portion 7 can be efficiently transferred to the stator core 5 and the core holder. 4 can be efficiently escaped. In this embodiment, since the first portion 71, the second portion 72, and the third portion 73 of the mold resin portion 7 are in contact with the inner peripheral surface 40 of the core holder 4, the stator resin 6 is transmitted to the mold resin portion 7. Heat can be efficiently released to the core holder 4.

  The mold resin portion 7 is made of resin filled from the other side L2 in the axial direction L in a state where the stator core 5 in which the stator coil 6 is wound around the salient pole 51 is provided inside the core holder 4, and therefore the mold resin portion 7 And the inner peripheral surface 40 of the core holder 4 can be brought into close contact with each other. Therefore, heat conduction from the mold resin portion 7 to the core holder 4 can be performed efficiently.

  In the first insulating member 61 and the second insulating member 62, the circumferential length of the portion of the inner plate portion 65 that overlaps the radially inner end portion of the salient pole 51 from the axial direction L is the radial direction of the salient pole 51. The inner end portion (inner plate portion 65) is shorter than the circumferential length. For this reason, the resin for molding supplied from the other side L2 of the stator core 5 in the axial direction L can easily reach the opposite side (one side L1) of the axial direction L through the inner plate portions 65 adjacent in the circumferential direction. .

Further, the groove-like recess 55 and the salient pole 51 are provided at the same angular position of the stator core 5. In addition, the groove-shaped recess 55 has a smaller dimension in the circumferential direction from the opening edge 551 located on the radially outer side toward the bottom 552 located on the radially inner side. For this reason, even when the groove-shaped recessed part 55 is formed in the stator core 5, a magnetic path can be formed appropriately. Moreover, since the width | variety of the opening edge 551 can be taken wide, resin can be poured into the one side L1 of the axial direction L. FIG.

  Furthermore, since the opening 45 of the core holder 4 is closed by the bottom wall 825 of the terminal holder 80 (second holder 82), the resin is unlikely to leak from the opening 45 when the resin for molding is filled. Further, the bottom wall 825 has a convex portion 826 that protrudes into the opening 45 at a portion where the hole 828 is formed, and therefore can sufficiently close the opening 45. Therefore, when the molding resin is filled inside the core holder 4, the resin is difficult to leak from the opening 45. Further, a hole 828 through which the wiring member 86 is passed is formed in the bottom wall 825 of the terminal holder 80, but the hole 828 is closed with the wiring member 86. Therefore, when the molding resin is filled, the resin hardly flows into the terminal holder 80 from the hole 828.

(Another embodiment)
In the above embodiment, the molding resin is supplied from the other side L2 in the axial direction L. However, the molding resin may be supplied from the one side L1 in the axial direction L.

  In the above embodiment, in the power feeding unit 8, different screws are used for coupling the first holder 81 and the second holder 82 and for coupling the second holder 82 and the core holder 4. Also good. Moreover, in the said embodiment, although the terminal holder 80 was comprised with two components (the 1st holder 81 and the 2nd holder 82), you may comprise the terminal holder 80 with one component.

  In the above embodiment, an example in which the present invention is applied to a permanent magnet type synchronous motor has been shown. However, for example, other synchronous motors such as a stepping motor 1 and an electromagnetic synchronous motor, an induction motor, a commutator motor, and other electric motors. The present invention may be applied to.

1 .... Motor, 2 .... Rotor, 3 .... Stator, 4 .... Core holder, 5 .... Stator core, 6..Stator coil, 7..Mold resin part, 8 .... Power feeding part, 9 .... Encoder, 11 .. First plate, 12 ... Second plate, 16 ... First bearing, 17 ... Second bearing, 19 ... Mold, 20 ... Rotary shaft, 22 ... Rotor core, 23 ... Rotor magnet, 39 .. First coating film, 40 .. Inner peripheral surface of core holder, 45 .. Opening part, 50 .. Divided core, 51 .. Salient pole, 52 .. Trunk part, 53. 54 .. Peripheral arc portion, 55 .. groove-shaped recess, 56 .. annular portion, 59 .. slot, 61 .. first insulating member, 62 .. second insulating member, 63 .. end plate portion, 64 .. Outer plate part, 65 .. Inner plate part, 66 .. First recess, 67 .. Second recess, 68 .. Plate-like protrusion, 7 .., the first part, 72, the second part, 73, the third part, 74, the fourth part, 80, the terminal holder, 81, the first holder, 82, the second holder, 86, Wiring member, 87 .... feed terminal, 88..ground terminal, 89..second coating film, 390..exposed part of first coating film, 680..third recess, 801..first seal 802 .. Second seal member 805 .. Groove 806 .. First convex portion 807 .. Second convex portion 808 .. Third convex portion 825 .. Bottom wall 826. 828 .. hole, L .. axial direction, L1 .. one side, L2 .. other side

Claims (12)

A rotor,
A stator core that surrounds the rotor radially outside, a stator coil wound around the stator core, and a stator including a cylindrical metal core holder that contacts the stator core from the radially outside and holds the stator core;
A power feeding unit provided on the outer peripheral side of the core holder;
Have
The power feeding unit holds a power feeding terminal electrically connected to the stator coil via a wiring member, a ground terminal, the ground terminal and the power feeding terminal, and is fixed to the core holder in a state of being in contact with the core holder. A metal terminal holder,
The motor, wherein the ground terminal is electrically connected to the core holder via the terminal holder. The terminal holder is coupled to the first holder made of metal that holds the power supply terminal and the ground terminal, and the first holder in contact with the first holder, and is fixed to the core holder in contact with the core holder. A metal second holder,
The power supply terminal is held by the first holder in an insulated state from the first holder,
The motor according to claim 1, wherein the ground terminal is held by the first holder while being electrically connected to the first holder. An annular first seal member is disposed between the first holder and the second holder,
One of the surface on the second holder side of the first holder and the surface on the first holder side of the second holder has a first convex portion protruding so as to be in contact with the other inside the first seal member. 3. The motor according to claim 2, wherein the motor is formed in a frame shape along the first seal member on the outside. The terminal holder includes a bottom wall formed with a hole through which the wiring member passes.
The core holder is formed with an opening through which the wiring member is passed.
The motor according to claim 1, wherein the opening is blocked by the bottom wall.   5. The motor according to claim 4, wherein the bottom wall is a convex portion in which a portion in which the hole is formed projects into the opening.   The motor according to claim 4, wherein the hole is blocked by the wiring member.   The motor according to any one of claims 4 to 6, wherein the stator core and the stator coil are covered by a mold resin portion filled inside the core holder. On one of the surface on the core holder side of the bottom wall and the surface overlapping the bottom wall of the core holder, a groove extending in an annular shape so as to surround the opening is formed,
The motor according to any one of claims 4 to 7, wherein an annular second seal member is disposed in the groove.   One of the surface of the bottom wall on the core holder side and the surface overlapping the bottom wall of the core holder has a second convex portion protruding so as to be in contact with the other inside the second seal member. The motor according to claim 8, wherein the motor is formed in a frame shape along the member.   One of the surface of the bottom wall on the core holder side and the surface overlapping the bottom wall of the core holder has a third convex portion protruding so as to be in contact with the other on the outside of the second seal member. The motor according to claim 8, wherein the motor is formed in a frame shape along the member. An insulating first coating film is formed on the outer peripheral surface of the core holder,
The said terminal holder is being fixed to the said core holder in the state which contact | connects the part exposed from the said 1st coating film of the outer peripheral surface of the said core holder, It is any one of Claim 1 thru | or 10 characterized by the above-mentioned. Motor. An insulating second coating film is formed on the second holder,
The first holder is fixed to the second holder in a state in contact with a portion exposed from the second coating film of the second holder,
4. The motor according to claim 2, wherein a portion of the second holder exposed from the second coating film is in contact with the core holder.