WO2019082668A1 - Moteur et procédé de production de moteur - Google Patents

Moteur et procédé de production de moteur

Info

Publication number
WO2019082668A1
WO2019082668A1 PCT/JP2018/037836 JP2018037836W WO2019082668A1 WO 2019082668 A1 WO2019082668 A1 WO 2019082668A1 JP 2018037836 W JP2018037836 W JP 2018037836W WO 2019082668 A1 WO2019082668 A1 WO 2019082668A1
Authority
WO
WIPO (PCT)
Prior art keywords
bus bar
axial direction
lid
stator core
bar terminal
Prior art date
Application number
PCT/JP2018/037836
Other languages
English (en)
Japanese (ja)
Inventor
晃弘 大北
貴之 右田
真郷 青野
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN201880067824.7A priority Critical patent/CN111247723B/zh
Publication of WO2019082668A1 publication Critical patent/WO2019082668A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes

Definitions

  • the present invention relates to a motor and a method of manufacturing the motor.
  • a motor which comprises a case for housing a stator.
  • Patent Document 1 describes a motor in which a stator is press-fit into a case.
  • foreign matter may occur in the case.
  • the foreign matter is produced, for example, by scraping at least one of the inner circumferential surface of the case and the outer circumferential surface of the stator when the stator is press-fit into the case.
  • foreign matter may move between the rotor and the stator, or to a bearing or the like to inhibit the rotation of the motor.
  • the foreign matter leaks to the outside of the case, which may cause a problem with the device or the like on which the motor is mounted.
  • a method of suppressing the movement of foreign matter in the case using an adhesive or the like may be considered, a step of applying the adhesive is required, and there is a problem that the labor and cost of manufacturing the motor increase. .
  • the present invention provides a motor having a structure capable of suppressing movement of foreign matter in a housing while suppressing an increase in manufacturing labor and cost, and a method of manufacturing such a motor.
  • a motor having a structure capable of suppressing movement of foreign matter in a housing while suppressing an increase in manufacturing labor and cost, and a method of manufacturing such a motor.
  • One aspect of the motor of the present invention accommodates a rotor having a shaft disposed along a central axis, a stator disposed with a gap on the radially outer side of the rotor, the rotor, and the stator. And a housing.
  • the housing has a lid covering one axial side of the stator, and a cylindrical tubular portion extending from the radial outer edge of the lid to the other axial side.
  • the stator is an annular stator core surrounding the rotor at the radial outer side of the rotor, and protrudes to one axial side from a surface at the axial one side of the stator core, and an annular shape surrounding the rotor at the radial outer side of the rotor And an annular portion.
  • the outer peripheral surface of the stator core is fixed to the inner peripheral surface of the cylindrical portion.
  • the outer circumferential surface of the annular portion is disposed radially inward of the outer circumferential surface of the stator core.
  • the annular portion has a contact portion that contacts the surface on the other side in the axial direction of the lid portion along one circumferential direction. A space surrounded by the outer peripheral surface of the annular portion, the surface on the other side in the axial direction of the lid portion, the inner peripheral surface of the cylindrical portion, and the surface on the one side in the axial direction of the stator core is configured.
  • One aspect of a method of manufacturing a motor according to the present invention is the method of manufacturing a motor described above, wherein the stator core is press-fit into the cylindrical portion from the other side in the axial direction, and the annular portion is the other side in the axial direction of the lid Contacting the surface of the substrate to form the space.
  • the motor in the motor, it is possible to suppress the movement of foreign matter in the housing while suppressing an increase in manufacturing labor and cost.
  • FIG. 1 is a perspective view showing a motor of the present embodiment.
  • FIG. 2 is a cross-sectional view showing the motor of the present embodiment, and is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a view of the motor of the present embodiment as viewed from above.
  • FIG. 4 is a perspective view showing a part of the motor of the present embodiment.
  • FIG. 5 is a perspective view showing the contact member of the present embodiment.
  • FIG. 6 is a view showing a part of the motor of the present embodiment, and is a cross-sectional view taken along the line VI-VI in FIG.
  • FIG. 7 is a perspective view showing a part of the motor of the present embodiment.
  • FIG. 1 is a perspective view showing a motor of the present embodiment.
  • FIG. 2 is a cross-sectional view showing the motor of the present embodiment, and is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a view of the
  • FIG. 8 is a cross-sectional view showing a part of the motor of the present embodiment, and is a partially enlarged view of FIG.
  • FIG. 9 is a perspective view showing a part of the motor of the present embodiment.
  • FIG. 10 is a perspective view showing a part of a motor which is another example of the present embodiment.
  • FIG. 11 is a perspective view showing a part of a motor which is another example of the present embodiment.
  • FIG. 12 is a view showing a part of a motor which is another example of the present embodiment, and is a cross-sectional view taken along line XII-XII in FIG.
  • the Z-axis direction appropriately shown in each drawing is a vertical direction with the positive side as the upper side and the negative side as the lower side.
  • a central axis J appropriately shown in each drawing is an imaginary line which is parallel to the Z-axis direction and extends in the vertical direction.
  • the axial direction of the central axis J that is, the direction parallel to the vertical direction
  • the radial direction centering on the central axis J is simply referred to as “radial direction”.
  • the circumferential direction centered on is simply referred to as "circumferential direction”.
  • the upper side corresponds to one side in the axial direction
  • the lower side corresponds to the other side in the axial direction.
  • the vertical direction, the upper side and the lower side are simply names for describing the relative positional relationship of each part, and the actual arrangement relationship etc. is an arrangement relationship etc. other than the arrangement relationship etc. indicated by these names. May be
  • the motor 10 includes a housing 11, a contact member 70, a rotor 20, bearings 24 and 25, an attachment member 26, a sensor magnet 27, and a stator 30. And.
  • the housing 11 accommodates the rotor 20 and the stator 30.
  • the housing 11 has a lid 12, a cylinder 13, and a bearing holder 14.
  • the cover part 12 is plate shape to which a plate surface turns to an axial direction, and is annular ring shape along the circumferential direction.
  • the lid 12 is centered on the central axis J.
  • the lid 12 covers the upper side of the stator 30. More specifically, the lid 12 covers the upper side of the stator core 31, the insulator 34 and the coil 35 which will be described later.
  • the lid 12 has a through hole 17 penetrating the lid 12 in the axial direction.
  • the through hole 17 has an arc shape extending in the circumferential direction.
  • a plurality of through holes 17 are provided along the circumferential direction. As shown in FIG. 1, in the present embodiment, three through holes 17 a, a through hole 17 b, and a through hole 17 c are provided, for example. In the case where the through holes 17a, the through holes 17b, and the through holes 17c are not particularly distinguished from one another, they are simply referred to as the through holes 17.
  • the circumferential dimension M1 of each through hole 17 is larger than the distance L between the through holes 17 adjacent in the circumferential direction. Therefore, the through hole 17 can be enlarged, and the weight of the housing 11 can be reduced easily.
  • the circumferential dimension M1 of the through hole 17a is larger than the circumferential dimension M1 of the through hole 17b and the circumferential dimension M1 of the through hole 17c.
  • the circumferential dimension M1 of the through hole 17b and the circumferential dimension M1 of the through hole 17c are substantially the same.
  • the distance L between the through hole 17 b and the through hole 17 c is larger than the distance L between the through hole 17 c and the through hole 17 a.
  • the distance L between the through hole 17a and the through hole 17b is larger than the distance L between the through hole 17b and the through hole 17c.
  • the through holes 17 a and the through holes 17 b are disposed on the opposite side in the radial direction with respect to the central axis J.
  • a part of the lid 12 has a protrusion 12 a that protrudes upward.
  • the upper surface of the protrusion 12 a is a flat portion 15. That is, a part of the upper surface of the lid 12 is a flat portion 15 projecting upward.
  • the flat portion 15 is disposed between the through holes 17 a and 17 b adjacent to each other in the circumferential direction of the lid 12.
  • the flat portion 15 is disposed substantially at the center in the radial direction between the radially inner edge of the lid 12 and the radially outer edge of the lid 12. Therefore, for example, when the flat portion 15 is manufactured by press working, the flat portion 15 can be easily manufactured.
  • the flat portion 15 is a flat surface orthogonal to the axial direction.
  • the flat portion 15 is rectangular. The flatness of the flat portion 15 is larger than the flatness of the portion of the upper surface of the lid 12 other than the flat portion 15.
  • the lid 12 has a mounting hole 16 penetrating the lid 12 in the axial direction.
  • the mounting hole 16 axially penetrates the center of the projection 12 a of the lid 12. That is, the mounting hole 16 is disposed in the flat portion 15.
  • the mounting hole 16 is, for example, circular.
  • the cylindrical portion 13 has a cylindrical shape extending downward from the radial outer edge of the lid 12.
  • the cylindrical portion 13 is cylindrical with the central axis J as a center.
  • the cylindrical portion 13 opens downward.
  • a plurality of collar portions protruding radially outward from the lower end portion of the cylindrical portion 13 are provided along the circumferential direction.
  • the bearing holder 14 is connected to the radially inner edge of the lid 12.
  • the bearing holding portion 14 has a tubular shape extending downward from the radial inner edge portion of the lid 12.
  • the bearing holder 14 is cylindrical around the central axis J and has a bottom.
  • the bearing holder 14 holds the bearing 25.
  • the outer peripheral surface of the bearing 25 is fixed to the inner peripheral surface of the bearing holding portion 14.
  • the housing 11 is made of metal, and is made of only a single metal member having the lid 12, the cylinder 13 and the bearing holder 14. That is, the housing 11 has a metal member made of metal having the lid 12 and the cylinder 13, and the metal member is a single member.
  • the housing 11 is made of, for example, aluminum.
  • the housing 11 is manufactured, for example, by pressing a metal plate member.
  • the housing 11 may be configured of a plurality of members. Also, the housing 11 may be manufactured by a method such as cutting or casting.
  • the contact member 70 shown in FIG. 4 is a member attached to the housing 11 and capable of contacting a terminal of an external device (not shown).
  • the external device is, for example, a control device that supplies power to the motor 10 to control the motor 10.
  • the terminal of the external device in contact with the contact member 70 is, for example, a terminal for grounding.
  • the terminals of the external device contact the upper surface of the contact member 70.
  • "the terminals of the external device can be in contact with the contact member” includes that the contact member has a portion exposed to the outside of the motor.
  • the contact member 70 is disposed on the flat portion 15.
  • the flatness of the portion of the lid 12 where the contact member 70 is disposed needs to be increased to some extent.
  • the flatness of the entire upper surface of the lid 12 is increased to some extent, there is a problem that the labor and cost for manufacturing the housing 11 increase.
  • the contact member 70 is disposed on the flat portion 15 as the flat portion 15 in which a part of the upper surface of the lid 12 is protruded. Therefore, it is only necessary to increase the flatness to a certain extent only in the flat portion 15 of the upper surface of the lid 12, and it is possible to suppress an increase in labor and cost of manufacturing the housing 11. Further, by making the axial position of the flat portion 15 different from the portion of the upper surface of the lid 12 other than the flat portion 15, it is easy to partially process the flatness of the lid 12 large, and the flatness is large It is easy to make the flat portion 15. Therefore, it is possible to further suppress an increase in labor and cost for manufacturing the housing 11. As described above, according to the present embodiment, the contact member 70 can be accurately disposed, and an increase in labor and cost for manufacturing the housing 11 can be suppressed.
  • the flatness of the flat portion 15 is larger than the flatness of the portion other than the flat portion 15 in the upper surface of the lid 12. Therefore, the contact member 70 can be arranged more accurately.
  • the flat portion 15 protrudes upward. Therefore, the contact member 70 can be easily disposed on the flat portion 15 from the upper side of the lid 12 as compared to the case where the flat portion 15 is recessed downward. In addition, even when the contact member 70 is larger than the flat portion 15, the contact member 70 can be easily disposed on the flat portion 15.
  • the flat portion 15 is disposed between the through holes 17a and 17b adjacent in the circumferential direction. Therefore, it is easy to secure the dimension of the flat portion 15 in the radial direction. Thus, the contact member 70 can be easily disposed on the flat portion 15.
  • the contact member 70 has a contact member main body 71 and claws 72.
  • the contact member main body 71 is a portion in contact with the flat portion 15.
  • the lower surface of the contact member main body 71 is in contact with the peripheral portion of the mounting hole 16 in the flat portion 15.
  • the contact member main body 71 has a cylindrical shape that is flat in the axial direction.
  • the outer diameter of the contact member main body 71 is smaller than the length of one side of the rectangular flat portion 15.
  • the entire contact member main body 71 overlaps the flat portion 15 as viewed in the axial direction.
  • the outer diameter of the contact member main body 71 becomes smaller toward the upper side.
  • the claw portion 72 is a portion extending from the contact member main body 71. More specifically, the claws 72 extend downward from the lower surface of the contact member main body 71. Therefore, for example, compared with the case where the claws 72 extend from the outer peripheral surface of the contact member main body 71, the arrangement area viewed along the axial direction of the contact member 70 can be reduced. Thus, the area of the portion of the upper surface of the lid 12 where the contact member 70 is not disposed can be increased, and the upper surface of the lid 12 can be effectively used.
  • the claw portion 72 has a base portion 72a and a hook portion 72b.
  • the base portion 72 a has a cylindrical shape extending downward from the central portion of the lower surface of the contact member main body 71.
  • the base 72 a is disposed coaxially with the contact member main body 71.
  • the base 72 a is inserted into the mounting hole 16.
  • the hook portion 72b is connected to the lower end of the base 72a.
  • the hooking portion 72b has a tubular shape whose inner diameter and outer diameter increase toward the lower side.
  • the lower end of the hook portion 72b is disposed below the protrusion 12a.
  • the outer edge at the lower end of the hook 72b contacts the peripheral edge of the mounting hole 16 in the lower surface of the protrusion 12a.
  • the claws 72 extend below the lid 12 through the mounting holes 16 and are hooked on the lower surface of the lid 12. Thereby, the contact member 70 can be prevented from coming off in the axial direction, and the contact member 70 can be easily attached to the flat portion 15.
  • the hook portion 72b is formed, for example, by caulking and expanding a cylindrical portion.
  • the worker attaching the contact member 70, an assembly apparatus, etc. (hereinafter referred to as the worker etc.) passes the cylindrical portion connected to the lower end of the base 72a to the mounting hole portion 16 from the upper side, Crimp and expand.
  • a worker or the like prepares a hook portion 72 b hooked on the lower surface of the lid 12, and attaches the contact member 70 to the housing 11.
  • the contact member 70 is a conductive member.
  • the contact member 70 is made of metal.
  • the material of the contact member 70 is, for example, different from the material of the housing 11. Therefore, the material of the contact member 70 can be easily selected, and the manufacturing cost of the motor 10 can be reduced.
  • the rotor 20 has a shaft 21, a rotor core 22, and a rotor magnet 23.
  • the shaft 21 is disposed along the central axis J.
  • the shaft 21 has a cylindrical shape extending in the axial direction about the central axis J.
  • the mounting member 26 is fixed to the upper end portion of the shaft 21.
  • the mounting member 26 has a cylindrical shape that opens upward.
  • a sensor magnet 27 is fixed to the inside of the mounting member 26.
  • the sensor magnet 27 has a cylindrical shape that is flat in the axial direction centering on the central axis J.
  • the rotor core 22 has a substantially annular shape fixed to the outer peripheral surface of the shaft 21.
  • the rotor magnet 23 is fixed to the outer peripheral surface of the rotor core 22.
  • the bearings 24 and 25 rotatably support the shaft 21.
  • the bearings 24 and 25 are, for example, ball bearings.
  • the bearings 24 and 25 may be bearings other than ball bearings as long as they can support the shaft 21 rotatably.
  • the rotor core 22 may be fixed directly to the outer peripheral surface of the shaft 21 or may be fixed indirectly via a member or the like.
  • the stator 30 radially faces the rotor 20 via a gap. More specifically, the stator 30 is disposed radially outside the rotor 20 with a gap.
  • the stator 30 has a stator core 31, an insulator 34, a plurality of coils 35, a support member 50, a bus bar terminal 60, and a resin portion 40.
  • the stator core 31 is an annular shape surrounding the rotor 20 at the radially outer side of the rotor 20.
  • the stator core 31 is disposed to face the radially outer side of the rotor magnet 23 with a gap therebetween.
  • the stator core 31 is, for example, a laminated steel plate configured by laminating a plurality of electromagnetic steel plates.
  • the stator core 31 may be a dust core or the like.
  • the stator core 31 has an annular core back 32 centered on the central axis J, and a plurality of teeth 33 extending radially inward from the core back 32.
  • illustration of the housing 11 is abbreviate
  • the outer peripheral surface of the core back 32 is fixed to the inner peripheral surface of the cylindrical portion 13.
  • the outer peripheral surface of the core back 32 is the outer peripheral surface of the stator core 31. That is, the outer peripheral surface of stator core 31 is fixed to the inner peripheral surface of cylindrical portion 13.
  • the stator core 31 is fixed to the cylindrical portion 13 by press fitting.
  • the plurality of teeth 33 are arranged at equal intervals along the circumferential direction.
  • the insulator 34 is mounted on the stator core 31.
  • the insulator 34 has a cylindrical extending portion 34a through which the teeth 33 pass, and an outer wall portion 34b located radially outward of the extending portion 34a.
  • the extending portion 34 a covers the teeth 33.
  • the outer wall 34 b extends upward from the extension 34 a.
  • the material of the insulator 34 is, for example, an insulating material such as a resin.
  • the plurality of coils 35 are attached to the stator core 31 via the insulators 34.
  • the plurality of coils 35 are configured by winding a wire around each tooth 33 via the insulator 34.
  • the winding system of the coil 35 is a so-called concentrated winding system.
  • the support member 50 is disposed on the upper side of the stator core 31, the insulator 34 and the coil 35.
  • the material of the support member 50 is an insulating material such as a resin.
  • the support member 50 has a main body 51 and a bus bar terminal holding portion 52.
  • the housing 11 and the resin portion 40 are not shown.
  • the winding system of the coil 35 may be another system other than the concentrated winding system.
  • the main body portion 51 is in the form of a plate whose plate surface faces in the axial direction. Although illustration is omitted, the main body 51 is in an annular shape centering on the central axis J. The main body 51 is disposed inside the housing 11. Although illustration is omitted, the main body 51 is supported and fixed to the insulator 34 from the lower side.
  • the main body 51 has a first hole 51 a penetrating the main body 51 in the axial direction.
  • the first hole 51a extends in the circumferential direction.
  • a plurality of first hole portions 51 a are provided along the circumferential direction.
  • the main body 51 has a second hole 51 b penetrating the main body 51 in the axial direction.
  • the second hole 51 b is disposed at a position overlapping the bus bar terminal holding portion 52 as viewed in the axial direction.
  • the bus bar terminal holding portion 52 has a cylindrical shape extending upward from the main body portion 51.
  • the bus bar terminal holding portion 52 is in the shape of a rectangular cylinder extending upward from the main body portion 51.
  • the bus bar terminal holding portion 52 extends to the upper side than the lid portion 12 through the through hole 17 and protrudes to the outside of the housing 11.
  • the bus bar terminal holding portion 52 has a first recess 52a, a second recess 52b, a pair of third recesses 52c, and a through portion 52d.
  • the first recess 52 a is recessed downward from the upper end surface of the radially inner wall portion of the bus bar terminal holding portion 52.
  • the first recess 52 a passes through the radially inner wall portion of the bus bar terminal holding portion 52 in the radial direction.
  • the first recess 52 a extends from the upper end of the bus bar terminal holder 52 to the lower end of the bus bar terminal holder 52.
  • the second recess 52 b is recessed downward from the upper end surface of the radially outer wall portion of the bus bar terminal holding portion 52. Although not shown, two second recesses 52b are provided at intervals in the circumferential direction.
  • the pair of third concave portions 52 c is recessed downward from the upper end surface of the wall portion on both sides in the circumferential direction of the bus bar terminal holding portion 52.
  • the third recess 52 c is open at the inner side surface of the bus bar terminal holding portion 52.
  • the penetrating portion 52 d penetrates the bus bar terminal holding portion 52 in the radial direction.
  • the penetrating portion 52 d penetrates the bus bar terminal holding portion 52 from the lower side of the second recess 52 b to the first recess 52 a.
  • the entire through portion 52 d overlaps with the second hole 51 b as viewed in the axial direction. Therefore, when molding the support member 50 by injection molding or the like using a resin, it is possible to mold the support member 50 having the penetrating portion 52d only with a die which is extracted in the axial direction. Therefore, it is not necessary to use a complex mold such as a slide core, and the labor and cost for manufacturing the support member 50 can be reduced.
  • a plurality of bus bar terminal holding portions 52 are provided along the circumferential direction. In FIG. 1, for example, three bus bar terminal holding portions 52 are provided.
  • the bus bar terminal 60 is supported by the support member 50.
  • the bus bar terminal 60 is a conductive member.
  • the bus bar terminal 60 is made of metal such as copper and silver.
  • the bus bar terminal 60 protrudes from the inside of the housing 11 to the outside of the housing 11 through the through hole 17.
  • the bus bar terminal 60 has a conductive portion 61, a connection portion 62, and a pair of protruding portions 63.
  • the conducting portion 61 is a plate shape whose plate surface faces in the radial direction, and extends in the axial direction. Conducting portion 61 is inserted into and held by bus bar terminal holding portion 52. The upper end of the conducting portion 61 protrudes above the bus bar terminal holding portion 52. The dimension in the circumferential direction of conductive portion 61 is smaller than the dimension in the circumferential direction in the inside of bus bar terminal holding portion 52 and the dimension in the circumferential direction of through portion 52 d.
  • the conduction portion 61 is connected to an external device such as a control device of the motor 10.
  • the connecting portion 62 is connected to the lower end of the conducting portion 61.
  • the connection portion 62 is disposed at a position projecting radially inward of the conduction portion 61. As viewed in the radial direction through which the through portion 52d passes, the connection portion 62 overlaps with the through portion 52d.
  • the connection portion 62 and the through portion 52 d are arranged side by side in the radial direction.
  • the connection portion 62 includes a pair of holding wall portions 62a and 62b and a connection portion 62c.
  • the pair of holding wall portions 62a and 62b are arranged radially spaced from each other.
  • the pair of holding wall portions 62a and 62b is in the form of a plate whose plate surface faces in the radial direction.
  • the pair of holding wall portions 62a and 62b extend in the axial direction.
  • the holding wall 62a is disposed radially inward of the holding wall 62b.
  • the holding wall portion 62a is disposed radially outward of the first recess 52a.
  • the holding wall portion 62 b is connected to the lower end of the conducting portion 61.
  • the radially outer portion of the holding wall portion 62b is disposed inside the first recess 52a.
  • the connecting portion 62 c connects lower end portions of the pair of holding wall portions 62 a and 62 b.
  • the connection portion 62 is U-shaped opening upward as viewed in the circumferential direction.
  • the connection portion 62 is formed by bending a part of the plate member into a U-shape. Note that the connection portion 62 may have a substantially U shape opened in the upper side as viewed in the circumferential direction.
  • the connecting portion 62 is connected to a lead wire 36 drawn upward from the coil 35.
  • the bus bar terminal 60 is electrically connected to the coil 35.
  • the lead wire 36 is an end portion of a lead that constitutes the coil 35.
  • the lead wire 36 is drawn from the lower side of the main body 51 to the upper side of the main body 51 via the first hole 51 a and extends along the circumferential direction.
  • the lead wire 36 is disposed between the pair of holding wall portions 62a and 62b in the radial direction, and contacts the pair of holding wall portions 62a and 62b.
  • the radial direction between the pair of holding wall portions 62a and 62b is located radially inward of the first recess 52a. Therefore, it is easy to pinch the lead wire 36 between the pair of holding wall portions 62a in the radial direction.
  • the pair of holding wall portions 62a and 62b are crimped in the radial direction to sandwich the lead wire 36 in the radial direction.
  • the pair of holding wall portions 62a and 62b and the lead wire 36 are, for example, welded to each other.
  • connection portion 62 and the through portion 52 d are arranged side by side in the radial direction. Therefore, when welding and fixing the bus bar terminal 60 and the lead wire 36, the connection portion 62 can be sandwiched by the welding terminals from both sides in the radial direction. Thus, the lead wire 36 and the bus bar terminal 60 can be easily welded while holding the bus bar terminal 60 in the bus bar terminal holding portion 52, and the space necessary for welding can be easily reduced.
  • two lead wires 36 are connected to the bus bar terminal 60.
  • the two lead lines 36 are arranged side by side in the axial direction.
  • the pair of protrusions 63 protrudes from the conductive portion 61 in the circumferential direction.
  • Conducting portion 61 is supported from the lower side by bus bar terminal holding portion 52. Thereby, the bus bar terminal 60 is positioned in the axial direction.
  • the pair of protrusions 63 is fitted into the pair of third recesses 52c.
  • three bus bar terminals 60 are provided along the circumferential direction.
  • the three bus bar terminals 60 are supplied with U-phase, V-phase, and W-phase alternating currents, respectively. Thereby, a three-phase alternating current is supplied to the motor 10 through the three bus bar terminals 60.
  • the motor 10 is a three-phase motor.
  • the motor 10 is not limited to the three-phase motor, and may be a single-phase motor, a two-phase motor, or a four-phase or more multi-phase motor. In that case, the number of bus bar terminals 60 may be appropriately changed according to the number of phases of the motor.
  • the resin part 40 is a member made of resin. As shown in FIGS. 2 and 7, the resin portion 40 has a substantially cylindrical shape extending in the axial direction centering on the central axis J. As shown in FIG. 2, in the resin portion 40, a portion of the stator core 31, at least a portion of the insulator 34, at least a portion of the coil 35, at least a portion of the support member 50, and a portion of the bus bar terminal 60 are embedded Be Therefore, stator core 31, insulator 34, coil 35, support member 50, and bus bar terminal 60 can be integrally fixed by resin portion 40. In addition, the coil 35 can be easily insulated. In the present embodiment, the entire insulator 34 and the entire coil 35 are embedded in the resin portion 40. The entire support member 50 except the upper end surface of the bus bar terminal holding portion 52 is embedded in the resin portion 40.
  • the resin portion 40 is manufactured, for example, by insert molding in which the molten resin is poured and solidified in a mold in which the stator core 31, the insulator 34, the coil 35, the support member 50, and the bus bar terminal 60 are inserted.
  • the bus bar terminal holding portion 52 has the first concave portion 52a, the second concave portion 52b and the penetrating portion 52d, the resin is also poured into the inside of the bus bar terminal holding portion 52 holding the bus bar terminal 60. Cheap. Therefore, when manufacturing resin part 40 by insert molding which uses supporting member 50 and bus bar terminal 60 as an insert member, short mold does not easily occur.
  • the resin portion 40 has a first annular portion 41, a second annular portion 42, a plurality of columnar portions 43, and a bus bar terminal support portion 44. That is, the stator 30 has a first annular portion 41, a second annular portion 42, a plurality of columnar portions 43, and a bus bar terminal support portion 44.
  • the first annular portion 41 protrudes upward from the upper surface of the stator core 31 and corresponds to an annular portion surrounding the rotor 20 at the radially outer side of the rotor 20.
  • the first annular portion 41 is substantially annular with the central axis J as a center. As shown in FIGS.
  • the outer circumferential surface of the first annular portion 41 is disposed radially inward of the outer circumferential surface of the stator core 31.
  • the outer circumferential surface of the first annular portion 41 extends upward from the upper end surface of the core back 32.
  • the inner circumferential surface of the first annular portion 41 is disposed at the same position as the radially inner side surface of the teeth 33 in the radial direction.
  • the first annular portion 41 is disposed below the lid 12.
  • the entire first annular portion 41 is housed inside the housing 11.
  • the first annular portion 41 covers the through hole 17 from the lower side. Therefore, foreign matter can be prevented from entering the inside of the housing 11 from the outside of the housing 11 through the through hole 17.
  • the first annular portion 41 has a contact portion 41 b that contacts the lower surface of the lid portion 12 along one circumferential direction.
  • the contact portion 41 b is a radial outer end portion of the upper end portion of the first annular portion 41.
  • the contact portion 41 b is located radially outward of the through hole 17.
  • the contact portion 41 b contacts a radially outer edge of the through hole 17 in the lower surface of the lid 12.
  • the contact portion 41 b has an annular shape centered on the central axis J.
  • the first annular portion 41 has a first hole 41 a recessed downward from the upper surface of the first annular portion 41. As shown in FIG. 1, the first hole 41 a overlaps with the through hole 17 as viewed in the axial direction. Thereby, for example, the stator 30 is positioned in the circumferential direction with respect to the housing 11 by inserting the jig into the first hole 41 a from the upper side of the lid 12 through the through hole 17, and the housing It can be fixed at 11.
  • a plurality of first hole portions 41 a are provided along the circumferential direction.
  • the second annular portion 42 protrudes downward from the lower surface of the stator core 31, and is an annular shape that surrounds the rotor 20 at the radially outer side of the rotor 20.
  • the second annular portion 42 is annular with the central axis J as a center.
  • the outer circumferential surface of the second annular portion 42 is disposed radially inward of the outer circumferential surface of the stator core 31.
  • the outer circumferential surface of the second annular portion 42 extends downward from the lower end surface of the core back 32.
  • the inner circumferential surface of the second annular portion 42 is disposed at the same position as the radially inner side surface of the teeth 33 in the radial direction.
  • the lower end of the second annular portion 42 protrudes from the lower opening of the cylindrical portion 13 below the housing 11. Inside the lower end of the second annular portion 42, a bearing 24 is fitted and held. In the second annular portion 42, a portion of the insulator 34 below the stator core 31 and a portion of the coil 35 below the stator core 31 are embedded.
  • the plurality of columnar parts 43 are columnar parts extending in the axial direction. Although not shown, the plurality of columnar portions 43 are arranged at equal intervals along the circumferential direction. The plurality of columnar portions 43 are disposed in portions between the teeth 33 adjacent to each other in the circumferential direction. Each columnar portion 43 is filled between the teeth 33 adjacent in the circumferential direction. The upper end of the columnar portion 43 is connected to the first annular portion 41. The lower end of the columnar portion 43 is connected to the second annular portion 42. The columnar portion 43 connects the first annular portion 41 and the second annular portion 42. The radially inner side surface of the columnar portion 43 is disposed at the same position as the radially inner side surface of the teeth 33 in the radial direction.
  • the inner circumferential surface of the first annular portion 41, the inner circumferential surface of the second annular portion 42, the radially inner side surface of each columnar portion 43, and the radially inner side surface of each tooth 33 have the same radial position. And forms a cylindrical curved surface having a central axis J as its center.
  • the bus bar terminal support portion 44 has a columnar shape that protrudes upward from the first annular portion 41. As viewed along the axial direction, the bus bar terminal support portion 44 extends in an arc shape along the circumferential direction. The side surfaces on both sides in the circumferential direction of the bus bar terminal support portion 44 are inclined in a direction approaching each other in the circumferential direction toward the upper side. The circumferential dimension M2 of the bus bar terminal support portion 44 decreases toward the upper side. Thereby, for example, when molding the bus bar terminal support portion 44 by injection molding, the mold can be easily removed. As shown in FIG. 3, the circumferential dimension M 2 of the bus bar terminal support portion 44 is smaller than the circumferential dimension M 1 of the through hole 17.
  • a plurality of bus bar terminal support portions 44 are provided along the circumferential direction.
  • three busbar terminal support portions 44 are provided: busbar terminal support portions 44a, busbar terminal support portions 44b, and busbar terminal support portions 44c.
  • the circumferential dimension M2 of the bus bar terminal support portion 44a is larger than the circumferential dimension of the bus bar terminal support portion 44b and the circumferential dimension M2 of the bus bar terminal support portion 44c.
  • the circumferential dimension M2 of the bus bar terminal support portion 44b and the circumferential dimension M2 of the bus bar terminal support portion 44c are substantially the same.
  • the bus bar terminal support portion 44a, the bus bar terminal support portion 44b, and the bus bar terminal support portion 44c are simply referred to as the bus bar terminal support portion 44 when not particularly distinguished from each other.
  • bus bar terminal 60 As shown in FIG. 8, a part of the bus bar terminal 60 is embedded in and supported by the bus bar terminal support portion 44.
  • the lower portion of the bus bar terminal 60 and the upper portion of the bus bar terminal holding portion 52 are embedded in the bus bar terminal support portion 44.
  • the upper end of the bus bar terminal 60 projects upward from the bus bar terminal support 44.
  • the bus bar terminal support portion 44 is inserted into the through hole 17.
  • the bus bar terminal support portion 44 protrudes above the lid 12 through the through hole 17 from the first annular portion 41.
  • the bus bar terminal support portion 44 a is passed through the through hole 17 a.
  • the bus bar terminal support portion 44b is passed through the through hole 17b.
  • the bus bar terminal support portion 44c is passed through the through hole 17c.
  • the outer edge of the bus bar terminal support portion 44 is disposed inside the inner edge of the through hole 17 with a gap over the entire circumference. Therefore, when the bus bar terminal support portion 44 is passed through the through hole 17, the contact of the bus bar terminal support portion 44 with the inner edge of the through hole 17 can be suppressed, and distortion of the shape of the lid 12 can be suppressed. Therefore, according to the present embodiment, in the motor in which the bus bar terminal support portion 44 is inserted into the through hole 17 of the housing 11, distortion of the housing 11 can be suppressed. In addition, the bus bar terminal support portion 44 can be prevented from being damaged by coming into contact with the inner edge of the through hole 17.
  • the housing 11 has the bearing holding portion 14 connected to the radially inner edge portion of the lid portion 12. And in this embodiment, since it can control that lid 12 is distorted as mentioned above, it can control that bearing attaching part 14 connected with lid 12 is distorted. Therefore, it can suppress that the arrangement
  • circumferential gaps G3 and G4 between the inner edge of through hole 17 and the outer edge of bus bar terminal support portion 44 are radial directions of the inner edge of through hole 17 and the outer edge of bus bar terminal support portion 44. Larger than the gaps G1 and G2. Therefore, even when the circumferential position of the bus bar terminal support portion 44 is shifted, the contact of the bus bar terminal support portion 44 with the inner edge of the through hole 17 can be suppressed. Thereby, distortion of the lid 12 can be further suppressed.
  • the dimension in the circumferential direction of the through hole 17 can be increased. Therefore, even when the circumferential position of the bus bar terminal support portion 44 is shifted, the contact of the bus bar terminal support portion 44 with the inner edge of the through hole 17 can be further suppressed. Therefore, distortion of the cover 12 can be further suppressed.
  • the gap G1 is a gap between the radially inner portion of the inner edge of the through hole 17 and the radially inner side surface of the bus bar terminal support portion 44.
  • the gap G2 is a gap between the radial direction of a portion of the inner edge of the through hole 17 located on the radially outer side and the radial outer surface of the bus bar terminal support portion 44.
  • the radial dimension of the gap G1 and the radial dimension of the gap G2 are substantially the same.
  • the gap G3 is a gap between the portion of the inner edge of the through hole 17 positioned on one circumferential side and the circumferential surface of the bus bar terminal support portion 44 on the one circumferential side.
  • the gap G4 is a gap between the portion of the inner edge of the through hole 17 located on the other side in the circumferential direction and the surface on the other side of the bus bar terminal support portion 44 in the circumferential direction.
  • the gap G3 on the side where the plane portion 15 in the direction is disposed is larger than the gap G4 on the side opposite to the side in which the plane portion 15 in the circumferential direction is disposed. That is, the dimension M3 in the circumferential direction of the gap G3 is larger than the dimension M4 in the circumferential direction of the gap G4.
  • the bus bar terminal support portions 44a and 44b can be further prevented from coming into contact with the edge portions of the through holes 17a and 17b on the side where the flat portion 15 in the circumferential direction is disposed. Thereby, it can suppress that the plane part 15 is distorted, and can suppress that the arrangement
  • One of the bus bar terminal support portions 44 a of the bus bar terminal support portions 44 has a second hole 45 recessed downward from the upper surface of the bus bar terminal support portion 44.
  • the second hole 45 can be used, for example, for positioning of the stator 30 in the circumferential direction, attachment of the external device to the bus bar terminal support 44, and the like.
  • stator 30 In the process of fixing the stator 30 to the housing 11, an operator or the like presses the stator 30 into the inside of the housing 11 from the lower opening of the cylindrical portion 13. The worker or the like moves the stator 30 upward with respect to the housing 11 until the first annular portion 41 contacts the lower surface of the lid 12. Thereby, the stator 30 is fixed to the housing 11 by press fitting.
  • the first annular portion 41 is in contact with the lower surface of the lid 12 to provide the contact portion 41b, whereby the outer circumferential surface of the first annular portion 41 and the lower surface of the lid 12 are provided as shown in FIG.
  • a space S surrounded by the surface, the inner peripheral surface of the cylindrical portion 13 and the upper surface of the stator core 31 is formed. That is, in the method of manufacturing the motor 10 of the present embodiment, the space S is formed by press-fitting the stator core 31 from the lower side into the cylindrical portion 13 and bringing the first annular portion 41 into contact with the lower surface of the lid 12. including.
  • the stator 30 when the stator 30 is fixed to the housing 11 by press-fitting, at least one of the outer peripheral surface of the stator core 31 and the inner peripheral surface of the cylindrical portion 13 which rub against each other is scraped off and foreign matter such as metal powder There is a possibility that it will occur.
  • the foreign matter is generated when the stator 30 moves upward with respect to the housing 11 and is accumulated on the upper surface of the stator core 31.
  • the space S is configured as described above, foreign matter can be caught in the space S. Therefore, the foreign matter can be prevented from moving to the outside of the space S, and the foreign matter can be suppressed from moving between the rotor 20 and the stator 30 and to the bearing 25 or the like.
  • stator core 31 when the stator core 31 is fixed to the cylindrical portion 13 by press fitting, at least one of the outer peripheral surface of the stator core 31 and the inner peripheral surface of the cylindrical portion 13 is scraped off, and foreign matter such as metal powder May occur. At that time, with the above configuration, when the stator core 31 is fixed to the cylindrical portion 13 by press fitting, it is possible to suppress movement of foreign matter.
  • the lid 12 and the cylinder 13 are part of the same single metal member. Therefore, when the stator core 31 is press-fit into the cylindrical portion 13, the stator core 31 is press-fit into the cylindrical portion 13 from the side opposite to the side where the lid portion 12 is provided, and the stator core 31 is moved toward the lid portion 12. Become. Therefore, the generated foreign matter is accumulated on the lid 12 side of the stator core 31, and it is easy to catch the foreign matter in the space S surrounded by the lid 12, the cylindrical portion 13 and the stator 30.
  • the space S can be configured. Therefore, it is possible to suppress foreign matter from moving to the outside of the housing 11 before the space S is formed.
  • the lid 12 and the cylinder 13 are separate members, if the lid 12 and the cylinder 13 are configured as one member by welding or the like, the space S is configured as described above. It is possible to prevent foreign matter from moving to the outside of the housing 11.
  • the first annular portion 41 is provided in the resin portion 40. Therefore, the first annular portion 41 can be easily formed by insert molding. Thereby, according to the shape of the housing 11, the 1st cyclic
  • the first annular portion 41 covers the through hole 17 from the lower side. Therefore, it is possible to suppress the foreign matter generated in the housing 11 from leaking to the outside of the housing 11 through the through hole 17.
  • the through holes 17 extend in the circumferential direction as in the present embodiment, the through holes 17 tend to be large, and foreign matter is likely to leak to the outside of the housing 11.
  • leakage of foreign matter from the through hole 17 to the outside of the housing 11 can be suppressed.
  • the contact portion 41 b is located radially outward of the through hole 17. Therefore, the through hole 17 does not open in the space S, and it is possible to suppress the foreign matter caught in the space S from leaking to the outside of the housing 11 through the through hole 17.
  • the upper surface of the stator core 31 surrounding the space S in the present embodiment is the upper surface of the core back 32.
  • the shape of the space S is, for example, a substantially cylindrical shape centered on the central axis J.
  • the space S is a sealed space. Therefore, it is possible to prevent the foreign matter caught in the space S from moving to the outside of the space S.
  • the housing 11 since distortion of the housing 11 can be suppressed, it can be suppressed that the housing 11 is distorted and the space S is not suitably formed.
  • the space S in the case where the space S is a sealed space as in the present embodiment, the space S tends to be unsealed when the housing 11 is distorted.
  • the housing 11 can be prevented from being distorted, and the space S can be easily configured as a sealed space.
  • the present invention is not limited to the above-described embodiment, and other configurations can be adopted.
  • the space S surrounded by the outer circumferential surface of the first annular portion, the lower surface of the lid portion, the inner circumferential surface of the cylindrical portion, and the upper surface of the stator core may not be a sealed space.
  • a gap connected to the outside of the housing may open.
  • the clearance opening in the space S be smaller than the foreign matter caught in the space S.
  • the first annular portion is not particularly limited as long as it is a part of the stator that has a contact portion that contacts the lower surface of the lid portion along the circumferential direction and can form the space S.
  • the first annular portion may be a portion other than the resin portion.
  • the first annular portion may be, for example, a part of the insulator, or may be formed of a part of the insulator and a part of the resin portion.
  • the material of the first annular portion is not particularly limited, and may be other than resin.
  • the bus bar terminal support portion may not protrude above the lid portion.
  • the size of the gap between the outer edge of the bus bar terminal support portion and the inner edge of the through hole is not particularly limited as long as it is provided over the entire periphery of the bus bar terminal support portion.
  • the circumferential gap between the inner edge of the through hole and the outer edge of the bus bar terminal support may have the same size as the radial gap between the inner edge of the through hole and the outer edge of the bus bar terminal support or It may be smaller than the radial gap between the inner edge of the hole and the outer edge of the bus bar terminal support.
  • the clearances on both sides in the circumferential direction between the inner edge of the through hole and the outer edge of the bus bar terminal support may have the same size.
  • the clearances on both sides in the radial direction between the inner edge of the through hole and the outer edge of the bus bar terminal support portion may have mutually different sizes.
  • the outer edge of the bus bar terminal support may contact the inner edge of the through hole.
  • the circumferential dimension M1 of the through holes may be the same as the distance L between through holes adjacent in the circumferential direction, or may be smaller than the distance L.
  • the shape of the through hole is not particularly limited.
  • the number of through holes and the number of bus bar terminal supports are not particularly limited.
  • the first hole and the second hole may not be provided.
  • the stator core may be fixed to the tubular portion using a method other than press fitting. Even in such a case, for example, there is a possibility that the foreign matter adhering to the upper surface of the stator core may be separated in the housing, so that the movement of the foreign matter can be suppressed by catching the foreign matter in the space S.
  • the housing may have another member other than a metal member made of metal having a tubular portion and a lid portion.
  • the material of the housing may be other than metal.
  • the flat portion may be a portion of the upper surface of the lid which is recessed downward. Also in this case, it is easy to partially process the cover with a large degree of flatness, and it is easy to form a flat portion with a large degree of flatness. Therefore, it is possible to further suppress an increase in labor and cost for manufacturing the housing.
  • the degree of flatness of the flat portion may be the same as the degree of flatness of a portion other than the flat portion of the upper surface of the lid.
  • the contact member may be configured as the contact member 170 of the motor 110 shown in FIGS. 10-12.
  • the illustration of the contact member 170 is omitted.
  • the mounting hole portions 116 of the lid portion 112 are disposed on both sides in the circumferential direction of the flat portion 115 in the projecting portion 112 a.
  • the mounting hole 116 has a first recess 116 a recessed toward the flat portion 115 at a portion of the inner edge of the mounting hole 116 located on the flat portion 115 side.
  • the first concave portion 116 a is provided at both ends in the radial direction of a portion of the inner edge of the mounting hole portion 116 located on the flat portion 115 side.
  • the radial dimension of the mounting hole 116 is smaller than the radial dimension of the flat portion 115.
  • the contact member main body 171 is in the form of a plate whose plate surface faces in the axial direction. Therefore, it is easy to make the contact member main body 171 by punching out the plate member or the like.
  • the contact member main body 171 has a substantially rectangular shape with rounded corners when viewed in the axial direction.
  • the outer shape of the contact member main body 171 surrounds the flat portion 115 as viewed in the axial direction.
  • the area of the contact member main body 171 viewed in the axial direction is larger than the area of the flat portion 115. Therefore, it is easy to bring the terminal of the external device into contact with the contact member main body 171.
  • the claw portions 172 are respectively provided at end portions on both sides in the circumferential direction of the contact member main body 171.
  • the claws 172 are plate-shaped.
  • the base portion 172 a extends downward from the circumferential end of the contact member main body 171.
  • the base 172 a is inserted into the mounting hole 116.
  • the hook portion 172b extends from the lower end of the base portion 172a to the side where the other claw portion 172 is disposed in the circumferential direction.
  • the upper surface of the hook portion 172b is hooked in contact with the lower surface of the protrusion 112a.
  • the base portion 172a and the hook portion 172b are formed by bending a plate-like arm portion extending from the contact member main body 171 in the circumferential direction.
  • second concave portions 171 a that are recessed toward the other claw portion 172 are provided on both sides in the radial direction of the portion of the contact member main body 171 where the claw portions 172 are connected. Therefore, it is easy to bend the arm extending from the contact member main body 171 at the root portion connected to the contact member main body 171, and it is easy to make the base portion 172a.
  • the shape of the contact member is not particularly limited as long as it is disposed on the flat portion and the terminals of the external device can be in contact with it, and may be a shape other than the contact members 70 and 170 described above.
  • the material of the contact member may be the same as the material of the housing.
  • the contact member may not be provided. In this case, the flat portion may not be provided.
  • the application of the motor of the embodiment described above is not particularly limited.
  • the motor of the embodiment described above can be used for various devices such as a pump, a brake, a clutch, a vacuum cleaner, a dryer, a ceiling fan, a washing machine, a refrigerator and an electric power steering device.
  • each said structure can be combined suitably in the range which does not contradiction mutually.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

La présente invention concerne un moteur équipé d'un rotor, d'un stator et d'un carter servant à loger le rotor et le stator. Le carter comporte une partie couvercle servant à recouvrir un premier côté du stator dans la direction axiale, et une partie cylindre tubulaire qui s'étend depuis la section de bord radialement vers l'extérieur de la partie couvercle en direction de l'autre côté dans la direction axiale. Le stator comporte un noyau de stator en forme d'anneau qui entoure le rotor du côté radialement vers l'extérieur du rotor, et comporte également une section en forme d'anneau qui entoure le rotor du côté radialement vers l'extérieur du rotor et fait saillie en direction du côté dans la direction axiale à partir de la surface du noyau de stator sur son premier côté dans la direction axiale. La surface circonférentielle extérieure du noyau de stator est fixée à la surface circonférentielle intérieure de la partie cylindre. La surface circonférentielle extérieure de la section en forme d'anneau est positionnée à l'intérieur dans la direction radiale par rapport à la surface circonférentielle extérieure du noyau de stator. La section en forme d'anneau comporte une partie de contact qui vient en contact avec la surface de l'autre côté de la partie couvercle dans la direction axiale le long de toute sa circonférence dans la direction circonférentielle. Un espace est formé, lequel est entouré par la surface circonférentielle extérieure de la section en forme d'anneau, par la surface de la partie couvercle de l'autre côté dans la direction axiale, par la surface circonférentielle intérieure de la partie cylindre, et par la surface du premier côté du noyau de stator dans la direction axiale.
PCT/JP2018/037836 2017-10-27 2018-10-11 Moteur et procédé de production de moteur WO2019082668A1 (fr)

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