JP6335506B2 - motor - Google Patents

Description

  The present invention relates to a motor including a bus bar unit that guides a current supplied to each coil of a stator.

  In a three-phase AC motor, it is known to provide a bus bar unit that supplies current from a terminal portion to a coil of each phase of a stator.

  Patent Document 1 describes a bus bar unit that includes a plurality of bus bars that supply current to each coil of a stator, and a bus bar base (insulator) that holds the bus bars in a state of being spaced apart in the radial direction of the stator. Has been.

  The bus bar base includes an annular main body having an annular groove for accommodating a plurality of bus bars, and a plurality of snap fits protruding from the outer peripheral end of the main body (see FIG. 4). The bus bar unit is attached to the stator by engaging each hook-like snap fit with the stator.

JP 2013-212008 JP

  In the motor including the bus bar unit, there is a problem that the bus bar base (bus bar holder) holding the bus bar vibrates due to the backlash where the hook-shaped snap fit engages with the stator.

The present invention has been made in view of the above problems, and an object thereof is to provide a motor capable of suppressing vibration generated in the bus bar holder for holding the busbars.

The present invention is a motor in which a rotor rotates inside a stator core, and includes a motor case having an opening, a motor cover attached to the opening of the motor case, a stator core accommodated in the motor case, and a stator core. In addition, an insulator in which the electromagnetic coil is wound , a bus bar that supplies current to the electromagnetic coil wound around the stator core, a bus bar holder that holds the bus bar, a motor cover, the bus bar holder, and the stator core are attached in the direction in which they are arranged. A biasing member that biases, and the biasing member is interposed between the bus bar holder and the insulator .
The present invention also includes a motor case having an opening, a motor cover attached to the opening of the motor case, a stator core accommodated in the motor case, an insulator mounted on the stator core and wound with an electromagnetic coil, A bus bar for supplying current to the electromagnetic coil wound around the stator core, a bus bar holder for holding the bus bar, and a biasing member for biasing in the direction in which the motor cover, the bus bar holder and the stator core are arranged. The biasing member is interposed between the motor case and the insulator.
The present invention also includes a motor case having an opening, a motor cover attached to the opening of the motor case, a stator core accommodated in the motor case, and a bus bar for supplying current to an electromagnetic coil wound around the stator core. A bus bar holder that holds the bus bar, and a biasing member that biases in the direction in which the motor cover, the bus bar holder, and the stator core are arranged, and the biasing member is integrated from the front end surface of the bus bar holder facing the motor cover. It is a convex part which protrudes and has elasticity, and abuts on a motor cover, and energizes a bus bar holder in the direction of an axis.

  In the present invention, the bus bar holder is supported by the stator core by being biased by the biasing member in the direction in which the motor cover, the bus bar holder, and the stator core are arranged. Since the vibration transmitted from the motor cover or the motor case to the bus bar holder is absorbed by the urging member, the vibration generated in the bus bar holder is suppressed.

1 is a cross-sectional view of a motor according to a first embodiment of the present invention. It is sectional drawing of the motor which expanded a part of FIG. It is a perspective view of a bus bar unit and a stator. It is sectional drawing of the motor which concerns on 2nd Embodiment of this invention. It is sectional drawing of the motor which concerns on 3rd Embodiment of this invention. It is sectional drawing of the motor which concerns on 4th Embodiment of this invention. It is sectional drawing of the motor which concerns on 5th Embodiment of this invention. It is sectional drawing of the motor which concerns on 6th Embodiment of this invention. It is sectional drawing of the motor which concerns on 7th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
A motor 100 shown in FIGS. 1 and 2 is used in an electric steering device (not shown) of a vehicle and applies a steering assist force to a steering shaft.

  The motor 100 includes a metal motor case 30 and a motor cover 40 made of an insulating resin material as casings. When the motor 100 is assembled to the steering device, the motor cover 40 is fastened to the casing (not shown) of the steering device by a plurality of bolts (not shown). The motor cover 40 has a function of a support (bracket) that supports the motor 100. The motor cover 40 may not have the function of a support, and may have only a casing function that closes the opening end of the motor case 30.

  The motor case 30 includes a cylindrical tube portion 33, a bottom portion 32 that closes one end of the tube portion 33, and an annular open end portion 31 that is provided around an opening that opens to the other end of the tube portion 33. Have.

  The motor cover 40 has a shape that covers the opening of the motor case 30. The motor cover 40 is fastened to the opening end 31 of the motor case 30 by a plurality of bolts (not shown). A seal ring 35 seals between the motor cover 40 and the motor case 30.

  A stator 10 is provided inside the motor case 30. A rotor 20 is provided inside the stator 10.

  The rotor 20 includes a rotor shaft 21 that is rotatably supported by the casing, and a magnet (permanent magnet) 22 that is attached to the rotor shaft 21.

  One end portion of the rotor shaft 21 is supported by the bottom portion 32 of the motor case 30 by the bearing 23, and the central portion thereof is supported by the motor cover 40 by the bearing 24. Thereby, the rotor 20 is supported rotatably about the central axis O.

  A gear (not shown) is attached to the other end portion of the rotor shaft 21 protruding from the motor cover 40. This gear meshes with a counterpart gear (not shown) linked to the steering shaft, and transmits the rotation of the rotor shaft 21 to the steering shaft at a reduced speed.

  The motor 100 includes a rotation detector 80 that detects the rotation angle of the rotor 20. The signal of the rotation detector 80 is sent to a controller (not shown) by a lead wire (not shown). This controller controls the rotation of the motor 100 by supplying a three-phase drive current corresponding to the rotational position of the rotor 20 to the stator 10 based on a signal from the rotation detector 80.

  The stator 10 includes a stator core 11 provided inside the motor case 30, a plurality of stator coils 12 provided on the stator core 11, and a bus bar unit 50 provided side by side with the stator coil 12 in the axial direction. “Axial direction” means the direction in which the central axis O of the stator 10 extends.

  The stator core 11 is made of a magnetic material and is formed by laminating a plurality of steel plates. The stator core 11 is fixed to the motor case 30 by fitting the outer periphery thereof to the inner periphery of the motor case 30.

  The stator coil (coil assembly) 12 includes a plurality of insulators 13 made of an insulating resin material surrounding each tooth portion 11A of the stator core 11, and a plurality of electromagnetic coils made of a wire 16 wound around the tooth portion 11A via each insulator 13. 14. The three-phase AC motor 100 includes U-phase, V-phase, and W-phase electromagnetic coils 14. An end portion of the wire 16 of the electromagnetic coil 14 of each phase is drawn out to one end side of the stator 10.

  The bus bar unit 50 includes a plurality of bus bars 51 made of a conductive material, and a bus bar holder 60 that encloses the bus bars 51.

  The bus bar holder 60 is formed by insert molding using an insulating resin material. At the time of manufacturing the bus bar unit 50, after each bus bar 51 is disposed in a mold (not shown), an insulating resin material is injected into the mold to insert-mold the bus bar holder 60.

  The bus bar holder 60 has an annular main body 61 that encloses the bus bar 51. Inside the main body 61, the bus bars 51 are held apart in the axial direction or the radial direction. The “radial direction” means a radial direction around the central axis O of the stator 10.

  The number of bus bars 51 corresponding to the U phase, V phase, W phase, and neutral point (four in this case) is provided. A plate-like bus bar 51 corresponding to each phase includes an arcuate conductive portion 54 that extends in an arcuate shape with a central axis O as a center, and a plurality of power supply terminals 52 that project radially from the arcuate conductive portion 54. And one bus bar terminal 53 protruding in the axial direction from the arcuate conductive portion 54.

  As shown in FIG. 3, the plurality of power supply terminals 52 corresponding to each phase protrude from the outer periphery of the main body 61. Three bus bar terminals 53 connected to the AC power supply protrude from one end of the main body 61.

  The bus bar holder 60 has a plurality (three in this case) of positioning portions 75 that protrude from the outer peripheral end of the main body portion 61 and engage with the outer periphery of the stator coil 12. When the bus bar holder 60 is molded, the main body 61 and the positioning portions 75 are integrally formed of a resin material by a mold. Note that the number of positioning portions 75 is not limited to three and may be three or more.

  Each positioning portion 75 is offset with respect to the circumferential direction of the stator 10 about the central axis O with respect to the power supply terminal 52 of each bus bar 51 so as not to line up with the power supply terminal 52 of each bus bar 51 in the axial direction. Is done. As a result, the wire 16 extending from the electromagnetic coil 14 and connected to the power feeding terminal 52 of the bus bar 51 does not interfere with the positioning portion 75. The “circumferential direction” means a direction around the central axis O of the stator 10.

  As shown in FIGS. 2 and 3, the band plate-shaped positioning portion 75 includes a base end portion 76 that protrudes in the radial direction from the outer peripheral end of the main body portion 61, and a tip end that extends from the base end portion 76 in the axial direction. Part 77. The bus bar holder 60 has a rear end surface 63 that abuts one end of the stator coil 12 at one end of the main body 61. The base end portion 76 of the positioning portion 75 extends without a step from the rear end surface 63 of the main body portion 61 and contacts the end surface 17 of the insulator 13. The distal end portion 77 of the positioning portion 75 is bent from the distal end of the base end portion 76 and abuts on the outer periphery of the insulator 13. The bus bar holder 60 is positioned in the radial direction with respect to the stator coil 12 by a plurality of positioning portions 75 engaging the outer periphery of the insulator 13, and is arranged on the same axis as the stator coil 12.

  On the other hand, an engaging portion 15 that engages with the positioning portion 75 is formed on the outer periphery of the insulator 13. The engaging portion 15 is a convex portion that protrudes from the outer periphery of the insulator 13. The engaging portion 15 protrudes so as to surround the distal end portion 77 of the positioning portion 75. The bus bar holder 60 is positioned in the circumferential direction with respect to the stator coil 12 by the distal end portion 77 of the positioning portion 75 being engaged with the engaging portion 15, and is held at a predetermined rotational position. Thereby, the wire 16 of each electromagnetic coil 14 is arranged so as to extend close to the power feeding terminal 52 of each bus bar 51. The engaging portion 15 is not limited to a convex portion that protrudes from the outer periphery of the insulator 13, but may be a concave portion that is recessed in the outer periphery of the insulator 13. Further, the positioning portion 75 may have other shapes as will be described later.

  The positioning portion 75 does not have a portion protruding like a nail like a snap fit provided in a conventional apparatus. For this reason, the shape of the metal mold | die which shape | molds the bus-bar holder 60 is simplified, the arrangement | positioning freedom degree of each bus-bar 51 is raised, and the quality of the bus-bar holder 60 is raised.

  When the stator 10 is assembled, the bus bar unit 50 is assembled to the stator coil 12 after the stator coil 12 is assembled to the stator core 11. At this time, the wire 16 of each electromagnetic coil 14 extends from the gap 19 provided between the opening end of the insulator 13 and the outer peripheral end of the bus bar holder 60, and the respective leading ends thereof are power supply terminals 52 of the bus bars 51. Welded to. In addition, illustration of the wire 16 is abbreviate | omitted in FIG.

  When the motor 100 is assembled, the motor cover 40 is assembled to the motor case 30 after the stator 10 is assembled to the motor case 30. At this time, the three bus bar terminals 53 protruding from one end of the main body 61 pass through the holes 47 of the motor cover 40. In the state where the motor 100 is assembled in this way, the main body portion 61 of the bus bar holder 60 has the rear end surface 63 provided at one end thereof abutting one end of the stator coil 12 and the front end surface 62 provided at the other end on the motor cover 40. Opposite with a gap 25.

  As a mechanism for supporting the bus bar holder 60, the motor 100 includes a plurality of (here, three) O-rings 70 that are compressed and interposed between the motor cover 40 and the bus bar holder 60. The O-ring 70 is formed in a ring shape by a rubber material, and has a circular cross-sectional shape in a free state where no external force acts. 1 and 2, the O-ring 70 has a flat shape in the assembled state compressed between the motor cover 40 and the bus bar holder 60, and the rear end surface 63 of the bus bar holder 60 is fixed to the stator by elastic restoring force. Press against one end of the coil 12. That is, the O-ring 70 is provided as an urging member that urges the motor cover 40, the bus bar holder 60, and the stator core 11 in the arrangement direction. When the bus bar holder 60 is pressed against the stator coil 12 by the O-ring 70, the bus bar holder 60 is supported by the stator core 11 via the stator coil 12.

  The three O rings 70 are arranged at substantially equal intervals in the circumferential direction. As a result, the biasing force of each O-ring 70 acts on the bus bar holder 60 at three locations that are symmetric about the central axis O, so that the center of the bus bar holder 60 is prevented from being inclined with respect to the central axis O. The rear end surface 63 of the bus bar holder 60 is in contact with one end of the stator coil 12 without a gap.

  A receiving portion 65 into which a part of the O-ring 70 is fitted is formed on the front end surface 62 of the main body portion 61. The receiving portion 65 is an annular groove that opens to a portion raised from the front end face 62 in a circular trapezoidal shape. When the bus bar holder 60 is molded, the main body 61 and the receiving portion 65 are integrally formed of a resin material by a mold. The receiving portion 65 is not limited to the annular groove, and may be an uneven portion formed on the front end surface 62 of the main body portion 61.

  The motor cover 40 is provided with a terminal 45 connected to an electric wire 46 corresponding to each phase. After the motor cover 40 is fastened to the motor case 30, each bus bar terminal 53 is welded to one end of each terminal 45.

  When the motor 100 is operated, a drive current is supplied to each electromagnetic coil 14 through the electric wire 46, the terminal 45, and the bus bar 51, and the rotor 20 is rotated by the magnetic force generated in the stator core 11.

  According to the above embodiment, there exists an effect shown below.

  [1] The motor 100 includes a motor case 30 having an opening, a motor cover 40 attached to the opening of the motor case 30, a stator core 11 accommodated in the motor case 30, and an electromagnetic coil wound around the stator core 11. 14, a bus bar 51 for supplying a current, a bus bar holder 60 for holding the bus bar 51, an O-ring 70 provided as an urging member for urging the motor cover 40, the bus bar holder 60, and the stator core 11 in an arrangement direction; It was set as the structure provided with.

  Based on the above configuration, when the vehicle is operated, vibration transmitted from the motor cover 40 to the bus bar holder 60 is absorbed by the O-ring 70, thereby suppressing vibration generated in the bus bar holder.

  The direction in which the motor cover 40, the bus bar holder 60, and the stator core 11 are arranged by the O-ring 70 provided as an urging member even if there is a slight dimensional error in the center axis O direction at the assembly position of each member constituting the motor 100. As a result, the bus bar holder 60 is supported by the stator core 11. Thereby, it becomes possible to abolish the process of connecting the bus bar holder to the stator coil using the adhesive, which has been performed in the conventional apparatus, and the cost of the product can be reduced.

  Furthermore, by eliminating the hook-like snap fit provided in the bus bar holder of the conventional device, the bus bar holder 60 can be downsized in the radial direction. Moreover, since the mold shape for molding the bus bar holder 60 is simplified, molding of the resin becomes easy, and the quality of the bus bar holder 60 can be improved.

  [2] The O-ring 70 provided as the urging member is configured to be interposed between the motor cover 40 and the bus bar holder 60.

  Based on the above configuration, the bus bar holder 60 is supported by the stator core 11 via the stator coil 12 by being pressed against the stator coil 12 by the urging force of the O-ring 70. The O-ring 70 sandwiched between the motor cover 40 and the bus bar holder 60 is elastically deformed and absorbs the vibration transmitted from the motor cover 40 to the bus bar holder 60, thereby suppressing the occurrence of natural vibration in the bus bar holder 60.

  [3] The bus bar holder 60 has a front end face 62 facing the motor cover 40, and the front end face 62 is formed with a receiving portion 65 into which a part of an O-ring 70 (biasing member) is fitted. did.

  Based on the above configuration, the O-ring 70 is held at a predetermined position between the motor cover 40 and the bus bar holder 60 by fitting a part thereof into the receiving portion 65 of the front end surface 62. Thereby, it is possible to prevent the mounting position of the O-ring 70 from being displaced during assembly of the motor 100 and during operation after assembly.

  [4] The bus bar holder 60 includes a positioning portion 75 that protrudes toward the insulator 13, and the insulator 13 includes an engaging portion 15 that engages with the positioning portion 75.

  Based on the above configuration, the bus bar holder 60 is positioned in the rotational direction with respect to the insulator 13 by the positioning portion 75 engaging with the engaging portion 15 of the insulator 13. Thereby, it is possible to prevent the mounting position of the bus bar holder 60 from being displaced in the rotational direction during the assembly of the motor 100 and during the operation after the assembly.

  Further, the bus bar holder 60 is positioned in the radial direction of the insulator 13 by the positioning portion 75 engaging the outer periphery of the insulator 13, and is disposed on the same axis as the insulator 13. Thereby, it is possible to prevent the mounting position of the bus bar holder 60 from being displaced in the radial direction of the insulator 13 during the assembly of the motor 100 and the operation after the assembly.

  [5] The bus bar unit 50 includes a bus bar 51 that includes the bus bar 51 and is insert-molded using an insulating resin material, and an O-ring 70 (attached between the motor cover 40 and the bus bar holder 60). Force member).

  Based on the above configuration, the bus bar unit 50 is supported by the stator core 11 by being pressed against the insulator 13 by the urging force of the O-ring 70. Thereby, the bus bar unit 50 can eliminate the conventional snap fit (hook) that engages with the insulator 13. As a result, the shape of the mold for insert-molding the bus bar unit 50 is simplified, and the quality of the bus bar unit 50 can be improved.

  In the present embodiment, three O-rings 70 are provided as urging members, but three or more O-rings 70 may be interposed between the bus bar unit 50 and the motor cover 40.

  Further, a configuration may be adopted in which one O-ring is interposed between the bus bar unit 50 and the motor cover 40 so as to extend over the entire circumference. In this case, since the biasing force of one O-ring acts on the bus bar holder 60 over the entire circumference of the stator 10, the center of the bus bar holder 60 is suppressed from being inclined with respect to the center line O, and the rear of the bus bar holder 60 The end face 63 abuts against one end of the stator coil 12 without a gap.

  Furthermore, in this embodiment, the receiving part 65 into which a part of the O-ring 70 is fitted is formed in the bus bar holder 60, but the receiving part into which a part of the O-ring 70 is fitted into the motor cover 40 is formed. It is good. Further, the urging member is not limited to the O-ring, and may have another shape.

  Further, the positioning portion 75 provided in the bus bar holder 60 of the present embodiment is in the form of a strip that engages with a part of the outer periphery of the stator coil 12, but covers the end face 17 of the insulator 13 and the stator coil 12. It may be disc-shaped. In this case, one end of the recess or projection is provided on the end surface of the bus bar holder 60 facing the insulator 13, and the other of the recess or projection is provided on the end surface 17 of the insulator 13. By engaging the concave and convex portions, the bus bar holder 60 is positioned with respect to the stator coil 12 in the radial direction and the circumferential direction. In order to take out the wire 16 extending from the stator coil 12, a groove through which the wire 16 is inserted is formed in the end surface 17 of the insulator 13. Thus, since the positioning part 75 which protrudes on the outer periphery of the insulator 13 is eliminated, the bus bar holder 60 can be downsized in the radial direction.

  Further, the positioning portion 75 provided in the bus bar holder 60 of the present embodiment may have an annular spigot portion that engages with the entire outer periphery of the stator coil 12.

  Furthermore, in the present embodiment, the bus bar unit 50 includes the bus bar holder 60 that includes the bus bar 51 and is insert-molded. However, the pre-molded bus bar holder is provided with a plurality of annular walls, and between the annular walls. It is good also as a structure by which each bus bar is interposed. In this case, the end face of each annular wall faces the stator coil 12, but a receiving portion into which a part of an urging member such as an O-ring is fitted is formed across the end face of each annular wall. The biasing member abuts over the receiving portion of the bus bar holder and the end face of each bus bar and is compressed. Each bus bar is held so as not to come out from between each annular wall by the urging force of the urging member.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the motor 100 according to the first embodiment, an O-ring 70 provided as an urging member is interposed between the motor cover 40 and the bus bar holder 260. In contrast, in the motor 200 according to the second embodiment, an O-ring 270 provided as an urging member is interposed between the bus bar holder 260 and the insulator 13 of the stator coil 12.

  The bus bar holder 260 has a plurality of (here, three) positioning portions 275 that protrude from the outer peripheral end of the main body portion 261 and engage with the outer periphery of the stator coil 12. The band plate-shaped positioning portion 275 has a base end portion 276 that protrudes in the radial direction from the outer peripheral end of the main body portion 261, and a front end portion 277 that is bent from the base end portion 276 and extends in the axial direction. The bus bar holder 260 has a rear end surface 263 that contacts one end of the stator coil 12 at one end of the main body portion 261. The base end portion 276 of the positioning portion 275 extends without a step from the rear end surface 263 of the main body portion 261 and comes into contact with one end of the stator coil 12. The distal end portion 277 of the positioning portion 275 is bent from the distal end of the proximal end portion 276 and abuts on the outer periphery of the insulator 13. The bus bar holder 260 is positioned in the radial direction and the circumferential direction with respect to the stator coil 12 by the plurality of positioning portions 275 engaging with the engaging portion 15 of the insulator 13, and arranged on the same axis as the stator coil 12. Is done.

  In the motor 200, as a mechanism for supporting the bus bar holder 260, a plurality of (here, three) O-rings 270 are interposed between the bus bar holder 260 and the insulator 13 of the stator coil 12 while being compressed. A gap 220 is provided between the rear end surface 263 of the bus bar holder 260 and the end surface 17 of the insulator 13.

  A receiving portion 265 into which a part of the O-ring 270 is fitted is formed on the rear end surface 263 of the bus bar holder 260. The receiving portion 265 is an annular groove that opens to the rear end surface 263 of the base end portion 276. At the time of molding the bus bar holder 260, the main body part 261, the receiving part 265, and the positioning part 275 are integrally formed of a resin material by a mold. The receiving portion 265 is not limited to the annular groove, and may be an uneven portion formed in the bus bar holder 260.

  The O-ring 270 is provided as a biasing member that biases in the direction in which the motor cover 40, the bus bar holder 260, and the stator core 11 are arranged. When the motor 200 is assembled, the O-ring 270 is compressed between the bus bar holder 260 and the insulator 13, and the front end surface 262 of the bus bar holder 260 is pressed against the motor cover 40 by the elastic restoring force of the O-ring 270. When the bus bar holder 260 is pressed against the motor cover 40 by the O-ring 270, the bus bar holder 260 is supported by the motor cover 40.

  According to the second embodiment described above, the effects [1] and [4] are obtained as in the first embodiment, and the following effects are obtained.

  [6] The motor 200 includes an insulator 13 that is mounted on the stator core 11 and on which the electromagnetic coil 14 is wound, and an O-ring 270 provided as an urging member is interposed between the bus bar holder 260 and the insulator 13. The configuration is as follows.

  Based on the above configuration, the bus bar holder 260 is supported by the motor cover 40 by being pressed against the motor cover 40 by the urging force of the O-ring 270. When the vehicle is in operation, the O-ring 270 sandwiched between the bus bar holder 260 and the insulator 13 is elastically deformed to absorb the vibration transmitted from the insulator 13 to the bus bar holder 260, thereby suppressing the occurrence of natural vibration in the bus bar holder 260. It is done.

  In the present embodiment, the receiving portion 265 into which a part of the O-ring 270 is fitted is formed in the bus bar holder 260, but the receiving portion into which a part of the O-ring 270 is fitted into the insulator 13 may be formed. . Further, the urging member is not limited to the O-ring, and may have another shape.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the motor 300 according to the third embodiment, one O-ring 370 is interposed between the bottom 32 of the motor case 30 and the insulator 13 of the stator coil 12 as a mechanism for supporting the bus bar holder 360. .

  The stator core 11 is slidably inserted with respect to the inner periphery of the cylindrical portion 33 of the motor case 30. The stator core 11 and the motor case 30 are formed with concave and convex engaging portions (not shown) that engage with each other along the central axis O direction. Thus, the stator core 11 is supported so as to be movable in the direction of the central axis O without rotating with respect to the motor case 30.

  A gap 320 is provided between the bottom 32 of the motor case 30 and the rear end surface 314 of the insulator 13. A receiving portion 315 into which a part of the O-ring 370 is fitted is formed on the rear end surface 314 of the insulator 13. The receiving portion 315 is a groove extending in an arc shape around the central axis O, and is formed integrally with the rear end surface 314 of the insulator 13 and a resin material when the insulator 13 is molded.

  The O-ring 370 is provided as an urging member that urges the motor cover 40, the bus bar holder 360, and the stator core 11 in the direction in which they are arranged. When the motor 300 is assembled, the O-ring 370 is compressed between the motor case 30 and the insulator 13, and the front end surface 316 of the insulator 13 is pressed against the rear end surface 363 of the bus bar holder 360 by the elastic restoring force of the O-ring 370. Then, the front end surface 362 of the bus bar holder 360 is pressed against the motor cover 40. When the O-ring 370 presses the bus bar holder 360 against the motor cover 40 via the insulator 13, the bus bar holder 360 is supported by the motor cover 40.

  According to the above 3rd Embodiment, while exhibiting the effect of said [1] and [4] similarly to 1st Embodiment, there exists the effect shown below.

  [7] The motor 300 includes an insulator 13 that is mounted on the stator core 11 and on which the electromagnetic coil 14 is wound, and an O-ring 370 provided as a biasing member is interposed between the motor case 30 and each insulator 13. The configuration is as follows.

  Based on the above configuration, the O-ring 370 sandwiched between the motor case 30 and each insulator 13 is elastically deformed and absorbs vibration transmitted from the motor case 30 to the bus bar holder 360 via each insulator 13 when the vehicle is operated. Thus, it is possible to suppress the occurrence of natural vibration in the bus bar holder 360 and each stator coil 12.

  Even if there is a slight dimensional error in the direction of the central axis O at the assembly position of each member constituting the motor 300, the bus bar holder 360 is pressed against the motor cover 40 via the insulator 13 by the urging force of the O-ring 370. Supported by the cover 40.

  In the present embodiment, one O-ring 370 is provided as a biasing member over each insulator 13. However, the present invention is not limited to this, and an O-ring may be provided for each insulator 13. Further, the urging member is not limited to the O-ring, and may have another shape.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the motor 400 according to the fourth embodiment, the bus bar holder 460 is provided with a convex portion 465 that abuts against the motor cover 40 and elastically deforms as a mechanism for supporting the bus bar holder 460.

  The main body 461 of the bus bar holder 460 has a rear end surface 463 provided at one end thereof in contact with one end of the stator coil 12, and a front end surface 462 provided at the other end faces the motor cover 40 with a gap 425.

  On the front end surface 462, a plurality of convex portions 465 protrude in a truncated cone shape. At the time of molding the bus bar holder 460, the main body portion 461, the convex portions 465, and the positioning portions 475 are integrally formed of a resin material by a mold. The convex portion 465 is not limited to the truncated cone shape, and may have another shape.

  Each convex portion 465 is provided as a biasing member that biases in the direction in which the motor cover 40, the bus bar holder 460, and the stator core 11 are arranged. In the assembled state of the motor 400, each convex portion 465 contacts and compresses the motor cover 40, and the rear end surface 463 of the bus bar holder 460 is pressed against one end of the stator coil 12 by the elastic restoring force of each convex portion 465. Each convex portion 465 presses the bus bar holder 460 against the stator coil 12, so that the bus bar holder 460 is supported by the stator core 11 via the stator coil 12.

  According to the fourth embodiment described above, the effects [1] and [4] are achieved as in the first embodiment, and the following effects are achieved.

  [8] The motor 400 has a configuration in which an elastic convex portion 465 is provided as an urging member that protrudes integrally from the front end surface 462 of the bus bar holder 460.

  Based on the above configuration, when the vehicle is operated, each convex portion 465 is elastically deformed and absorbs vibration transmitted from the motor cover 40 to the bus bar holder 460, thereby suppressing the occurrence of natural vibration in the bus bar holder 460.

  When the motor 400 is assembled, the bus bar holder 460 is supported by the motor cover 40 by the urging force of each convex portion 465 even if each member has a slight dimensional error in the central axis O direction.

  In this embodiment, since the O-ring provided separately from the bus bar holder is eliminated as compared with the first embodiment, the structure can be simplified and the number of assembling steps can be reduced.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  The motor 500 according to the fifth embodiment is provided with an adhesive 570 that couples the stator core 11 to the cylindrical portion 33 of the motor case 30 as a mechanism for supporting the bus bar holder 560.

  A cylindrical gap 501 is provided between the outer periphery of the stator core 11 and the inner periphery of the cylindrical portion 33 of the motor case 30. When the motor 500 is assembled, the stator core 11 is assembled to the motor case 30 after the adhesive 570 is applied to the stator core 11 or the motor case 30. Thus, the adhesive 570 filled in the gap 501 is solidified, whereby the stator core 11 is coupled to the motor case 30.

  The adhesive 570 is provided as an urging member that urges the motor cover 40, the bus bar holder 560, and the stator core 11 in the direction in which they are arranged. In a state where the motor 500 is assembled, the adhesive 570 is elastically deformed in the direction of the central axis O between the motor case 30 and the stator core 11, and the stator core 11 is moved to the motor case 30 by the elastic restoring force of the adhesive 570. It is pulled to the cover 40 side (left direction in FIG. 7). The stator core 11 pushes the bus bar holder 560 toward the motor cover 40 via the insulator 13 by the elastic restoring force of the adhesive 570. Thereby, the front end surface 562 of the bus bar holder 560 is pressed against the motor cover 40 and is supported by the motor cover 40.

  According to the fifth embodiment described above, the effects [1] and [4] are obtained as in the first embodiment, and the following effects are obtained.

  [9] The motor 500 is provided with an adhesive 570 that is applied between the motor case 30 and the stator core 11 as an urging member and couples the two together. The adhesive 570 is elastically deformed so that the stator core 11 is centered on the central axis O. The configuration is biased in the direction.

  Based on the above configuration, when the vehicle is operated, the adhesive 570 is elastically deformed and absorbs vibration transmitted from the motor case 30, thereby suppressing occurrence of natural vibration in the stator core 11, the insulator 13, and the bus bar holder 560.

  When the motor 500 is assembled, the bus bar holder 560 is pressed against and supported by the motor cover 40 by the urging force of the adhesive 570 even if there is a slight dimensional error in each member in the direction of the central axis O.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the motor 600 according to the sixth embodiment, a plurality of claw portions 635 for urging the stator core 11 are integrally formed on the motor case 630 as a mechanism for supporting the bus bar holder 660.

  The stator core 11 is slidably inserted with respect to the inner periphery of the cylinder portion 633 of the motor case 630. The stator core 11 and the motor case 630 are formed with concave and convex engaging portions (not shown) that engage with each other along the central axis O direction. Thereby, the stator core 11 is supported so as to be movable in the direction of the central axis O without rotating with respect to the motor case 630.

  Each claw portion 635 is formed by cutting out the cylindrical portion 633 of the motor case 630. Each claw portion 635 is formed by bending a band-shaped portion surrounded by a U-shaped or V-shaped cut formed in the cylindrical portion 633 inward in the radial direction.

  Each claw portion 635 is provided as a biasing member that biases in the direction in which the motor cover 40, the bus bar holder 660, and the stator core 11 are arranged. In the assembled state of the motor 600, the tip of each claw 635 abuts on the end surface 17 of the stator core 11 and elastically deforms, and the stator core 11 is moved to the motor cover 40 side by the elastic restoring force of each claw 635 (see FIG. 8). To the left). The stator core 11 pushes the bus bar holder 660 to the motor cover 40 side via the insulator 13 by the elastic restoring force of each claw portion 635. Accordingly, the front end surface 662 of the bus bar holder 660 is pressed against the motor cover 40 and is supported by the motor cover 40.

  According to the sixth embodiment described above, the effects [1] and [4] are achieved as in the first embodiment, and the following effects are achieved.

  [10] The motor 600 has a configuration in which a claw portion 635 that is in contact with the stator core 11 is formed integrally with the motor case 630 as an urging member, and the claw portion 635 is elastically deformed to urge the stator core 11 in the direction of the central axis O. It was.

  Based on the above configuration, the natural vibrations of the stator core 11, the insulator 13, and the bus bar holder 660 can be prevented from occurring by absorbing the vibration transmitted from the motor case 30 by the elastic deformation of each claw portion 635 when the vehicle is driven. .

  When the motor 600 is assembled, the bus bar holder 660 is pressed against and supported by the motor cover 40 by the urging force of each claw 635 even if each member has a slight dimensional error in the direction of the central axis O.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the motor 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  A motor 700 according to the seventh embodiment includes a plurality of bolts 710 that fasten a motor cover 740 to a motor case 730, and a metal spring 770 is interposed between each bolt 710 and the motor cover 740.

  The motor case 730 has an annular opening end 731. The motor cover 740 has a flange portion 741 that faces the opening end portion 731. The flange portion 741 of the motor cover 740 is fastened to the opening end portion 731 of the motor case 730 by a plurality of bolts 710 and nuts 712. The bolt 710 and the nut 712 are screwed together to form a fastening portion that fastens the motor cover 740 and the motor case 730.

  The metal spring 770 has a cylindrical shape whose cross section is curved in an arc shape, and one end thereof is in contact with the flange portion 741 and the other end is in contact with the head portion 711 of the bolt 710. The metal spring 770 is interposed between the flange portion 741 and the head portion 711 of the bolt 710 by being compressed.

  The metal spring 770 is provided as an urging member that urges the motor cover 740, the bus bar holder 760, and the stator core 11 in the direction in which they are arranged. In the assembled state of the motor 200, the metal spring 770 is compressed between each bolt 710 and the flange portion 741, and the motor case 730 and the stator core 11 are moved to the motor cover 740 side by the elastic restoring force of each metal spring 770 (FIG. 8). At the left). The stator core 11 pushes the bus bar holder 760 toward the motor cover 740 via the insulator 13 by the elastic restoring force of each metal spring 770. Accordingly, the front end surface 762 of the bus bar holder 760 is pressed against the motor cover 740 and is supported by the motor cover 740.

  According to the seventh embodiment described above, the effects [1] and [4] are obtained as in the first embodiment, and the following effects are obtained.

  [11] The motor 700 includes a bolt 710 as a fastening portion for fastening the motor cover 740 to the motor case 730, and a metal spring 770 provided as an urging member is interposed between the bolt 710 and the motor cover 740. The spring 770 is elastically deformed to bias the motor case 30 in the direction of the central axis O.

  Based on the above configuration, the bus bar holder 760 is supported by the motor cover 740 by being pressed against the motor cover 740 by the urging force of the metal spring 770. When the vehicle is operated, the metal spring 770 sandwiched between the bolt 710 and the motor cover 740 is elastically deformed to absorb the vibration transmitted from the motor case 730 to the bus bar holder 760, thereby generating natural vibration in the bus bar holder 760. Can be suppressed.

  In the present embodiment, the metal spring 770 is interposed between the head 711 of the bolt 710 and the motor cover 740, but the metal spring 770 is not interposed between the nut 712 and the motor case 30. It is good also as a structure to be made. Further, the nut 712 may be eliminated, and the bolt 710 may be screwed into a screw hole formed in the motor case 30.

  In the present embodiment, the metal spring 770 has a cylindrical shape with a curved cross section, but is not limited thereto, and may be a metal spring having another shape. The urging member is not limited to a metal spring, and may be made of an elastic material such as a rubber material.

  As mentioned above, although embodiment of this invention was described, this embodiment only showed a part of application example of this invention, and in the meaning which limits the technical scope of this invention to the specific structure of this embodiment. Absent. Moreover, you may combine suitably the urging | biasing member of 1st-7th embodiment.

  The motor 100 of this embodiment is used in an electric steering device (not shown) of a vehicle, but may be used in other machines and equipment.

  Furthermore, although the motor 100 of this embodiment is used in an electric steering device (not shown) of a vehicle, it may be used in other machines and equipment.

  Furthermore, the motor 100 of the present embodiment is not limited to a prime mover that generates power by electric power, but may be used for a generator that generates electric power by power.

DESCRIPTION OF SYMBOLS 11 Stator core 12 Stator coil 15 Engagement part 20 Rotor 25 Gap 30, 630, 730 Motor case 40, 740 Motor cover 50 Bus bar unit 51 Bus bar 60, 260, 360, 460, 560, 660, 760 Bus bar holder 62 Front end face 63 Rear End face 65 Receiving part 70, 270, 370 O-ring (biasing member)
75 Positioning part 100, 200, 300, 400, 500, 600, 700 Motor 465 Protruding part (biasing member)
570 Adhesive (biasing member)
635 Claw part (biasing member)
710 bolt (fastening part)
770 Metal spring (biasing member)

Claims (4)

A motor case having an opening;
A motor cover attached to the opening of the motor case;
A stator core housed in the motor case;
An insulator mounted on the stator core and wound with an electromagnetic coil;
A bus bar for supplying a current to the electromagnetic coil wound around the stator core,
A bus bar holder for holding the bus bar;
An urging member for urging in a direction in which the motor cover, the bus bar holder, and the stator core are arranged ;
The motor according to claim 1, wherein the biasing member is interposed between the bus bar holder and the insulator . A motor case having an opening;
A motor cover attached to the opening of the motor case;
A stator core housed in the motor case;
An insulator mounted on the stator core and wound with an electromagnetic coil;
A bus bar for supplying a current to the electromagnetic coil wound around the stator core;
A bus bar holder for holding the bus bar;
An urging member for urging in a direction in which the motor cover, the bus bar holder, and the stator core are arranged;
The urging member is interposed between the motor case and the insulator .   The bus bar holder includes a positioning portion that protrudes toward the insulator.
  The motor according to claim 1, wherein the insulator includes an engaging portion that engages with the positioning portion. A motor case having an opening;
A motor cover attached to the opening of the motor case;
A stator core housed in the motor case;
A bus bar for supplying current to the electromagnetic coil wound around the stator core;
A bus bar holder for holding the bus bar;
An urging member for urging in a direction in which the motor cover, the bus bar holder, and the stator core are arranged;
The urging member is a convex portion that protrudes integrally from a front end surface of the bus bar holder facing the motor cover and has elasticity, and abuts the motor cover to urge the bus bar holder in the axial direction. Characteristic motor.

Images