JP2018057229A - Motor, and electric power steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a bus bar having a structure capable of easily fixing a conductor wire of a stator.SOLUTION: A motor comprises a rotor having a shaft arranged along a center axis, a stator that is arranged outside the rotor in a radial direction, and around which a conductor wire 43a is wound, and a bus bar 70 electrically connected with the conductor wire. The bus bar has a holding part 76 for holding the conductor wire. The holding part has a first arm part 76a, a second arm part 76b parallely extending in a predetermined direction, and a coupling part 76c coupling one end of the first arm part and one end of the second arm part. The conductor wire is interposed between the first and second arm parts. At least one of the first and second arm parts is brought into contact with the conductor wire. The first arm part has a linear part 76d linearly extending in the predetermined direction from the coupling part, and a bent part 76e being bent in a direction in which it goes close to the second arm part from a leading end of the linear part. The bent part is opposed to the conductor wire. A dimension of the first arm part in the predetermined direction is greater a dimension of the second arm in the predetermined direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a motor and an electric power steering apparatus.

  Conventionally, there is known a bus bar provided with a coil connection portion connected to a winding wound around a stator. For example, in Patent Document 1, the coil connection part has a U-shaped hook into which a winding connection part drawn from a winding is inserted and soldered.

JP 2010-141953 A

  In the bus bar as described above, when the winding connection portion and the hook are fixed, the winding connection portion may come out from the opening of the hook. Therefore, there is a problem that it takes time to fix the winding and the bus bar.

  In view of the above problems, an object of the present invention is to provide a motor including a bus bar having a structure capable of easily fixing a conductor of a stator, and an electric power steering apparatus including such a motor.

  One aspect of the motor of the present invention includes a rotor having a shaft disposed along a central axis, a stator disposed on a radially outer side of the rotor and wound with a conductive wire, and electrically connected to the conductive wire. A bus bar, the bus bar having a grip portion for gripping the conducting wire, the grip portion extending in parallel along a predetermined direction, and the first arm portion and the second arm portion. A connecting portion that connects one end of one arm portion and one end of the second arm portion, and the conductive wire is sandwiched between the first arm portion and the second arm portion, and the first arm portion And at least one of the second arm portions is in contact with the conducting wire, and the first arm portion includes a straight portion extending linearly from the connecting portion along the predetermined direction, and a tip of the straight portion. A bent portion that is bent in a direction approaching the second arm portion, and the bent portion and the conductive wire Direction, and the predetermined dimension of the first arm portion is greater than the predetermined dimension of said second arm portion.

  According to one aspect of the present invention, a motor including a bus bar having a structure capable of easily fixing a conductor of a stator, and an electric power steering apparatus including such a motor are provided.

FIG. 1 is a cross-sectional view showing the motor of this embodiment. FIG. 2 is a perspective view showing a portion of the motor of this embodiment. FIG. 3 is a plan view showing a portion of the motor of this embodiment. FIG. 4 is a plan view showing the gripping portion of the present embodiment. FIG. 5 is a plan view showing the grip portion of the present embodiment. FIG. 6 is a schematic diagram showing the electric power steering apparatus of the present embodiment.

  As shown in FIG. 1, the motor 10 of the present embodiment includes a rotor 30, a stator 40, a housing 20, a bearing holder 50, a bus bar unit 60, and a control device 80. The rotor 30 has a shaft 31 and a rotor core 32. The shaft 31 is disposed along a central axis J that extends in the vertical direction. The rotor core 32 is fixed to the outer peripheral surface of the shaft 31.

  In the following description, a direction parallel to the central axis J is simply referred to as “vertical direction”, a radial direction centered on the central axis J is simply referred to as “radial direction”, and a circumferential direction centered on the central axis J is referred to as “circumferential direction”. It is simply called “circumferential direction”. Further, the upper side in FIG. 1 in the vertical direction is simply referred to as “upper side”, and the lower side in FIG. 1 in the vertical direction is simply referred to as “lower side”. Note that the upper side, the lower side, and the vertical direction are simply names for explaining the relative positional relationship between the respective parts, and do not limit the actual positional relationship and the like.

  The stator 40 is disposed on the radially outer side of the rotor 30. The stator 40 includes an annular stator core 41, an insulator 42 attached to the stator core 41, and a coil 43 attached to the stator core 41 via the insulator 42. The coil 43 is configured by winding a conducting wire 43a. That is, the conductive wire 43 a is wound around the stator 40.

  As shown in FIGS. 1 and 2, the housing 20 has a cylindrical shape that accommodates each part of the motor 10. In addition, illustration of the control apparatus 80 is abbreviate | omitted in FIG. As shown in FIG. 1, the bearing holder 50 has a substantially disk shape extending in the radial direction. The bearing holder 50 is disposed on the upper side of the stator 40. The bearing holder 50 holds a bearing that rotatably supports the shaft 31 on the upper side of the rotor core 32.

  The bus bar unit 60 has a substantially disk shape that expands in the radial direction as a whole. Bus bar unit 60 is arranged above stator 40. More specifically, the bus bar unit 60 is fixed to the upper surface of the bearing holder 50. The bus bar unit 60 includes a bus bar 70 and a bus bar holder 60a. That is, the motor 10 includes a bus bar 70.

  The bus bar holder 60a holds the bus bar 70. As shown in FIGS. 1 to 3, the bus bar holder 60 a has a substantially disk shape that expands in the radial direction. As shown in FIG. 1, the bus bar holder 60 a is fitted inside the housing 20 in the radial direction. The lower surface of the bus bar holder 60 a is in contact with the upper surface of the bearing holder 50. The bus bar holder 60a is made of resin, for example. As shown in FIG. 2, the bus bar holder 60 a includes a bus bar holder main body 66, a plurality of first protrusions 67, and a plurality of second protrusions 68.

  The bus bar holder main body 66 is a disk-shaped portion that expands in the radial direction. The bus bar holder main body 66 supports the bus bar 70 from below. As shown in FIG. 3, the bus bar holder main body 66 has a first holder through hole 66 c and a second holder through hole 66 d that penetrate the bus bar holder main body 66 in the vertical direction. The first holder through-hole 66 c is disposed in the center of the bus bar holder main body 66. The plan view shape of the first holder through-hole 66c is a circular shape centered on the central axis J. As shown in FIG. 1, the shaft 31 is passed through the first holder through hole 66c. As shown in FIG. 3, a plurality of second holder through holes 66d are provided along the circumferential direction. The planar view shape of the second holder through hole 66d is a circular shape. The conducting wire 43a is passed through the second holder through hole 66d.

  The first protrusion 67 is press-fitted into a first through hole 70 b provided in the bus bar 70. The bus bar 70 is positioned with respect to the bus bar holder 60a by the first protrusion 67. The second protrusion 68 is inserted into the second through hole 70 c provided in the bus bar 70. Although not shown, the upper end of the first protrusion 67 and the upper end of the second protrusion 68 are respectively melted after passing through the first through hole 70b and the second through hole 70c, respectively, on the upper surface of the bus bar 70. Welded. Thereby, the bus bar 70 is fixed to the bus bar holder 60a.

  As shown in FIGS. 1 and 2, the bus bar 70 has a plate shape. The bus bar 70 is disposed on the upper surface 66 a of the bus bar holder main body 66. Bus bar 70 is electrically connected to conductive wire 43a. More specifically, the bus bar 70 is electrically connected to the coil 43 via an upper end portion of a conducting wire 43 a extending upward from the coil 43. As shown in FIG. 1, the upper end portion of the conducting wire 43a is drawn above the bus bar holder 60a via a hole penetrating the bearing holder 50 in the vertical direction and the second holder through hole 66d.

  As shown in FIG. 3, in the present embodiment, the bus bar 70 includes five bus bars: a first bus bar 71, a second bus bar 72, a third bus bar 73, a fourth bus bar 74, and a fifth bus bar 75. The first bus bar 71, the second bus bar 72, and the third bus bar 73 are, for example, phase bus bars. The fourth bus bar 74 and the fifth bus bar 75 are neutral point bus bars.

  The first bus bar 71 includes a main body portion 71 a, two gripping portions 76, and a terminal portion 77. The main body 71a is an elongated plate extending along a plane orthogonal to the vertical direction. The plate surface of the main body 71a is orthogonal to the vertical direction. The main body 71a includes a first portion 71b, a second portion 71c, a third portion 71d, and a fourth portion 71e.

  The first portion 71b is a portion extending in a substantially arc shape along the circumferential direction on the radially outer side than the second holder through hole 66d. A gripping portion 76 is connected to one circumferential end of the first portion 71b. A terminal portion 77 is connected to the other circumferential end of the first portion 71b. The second portion 71c is a portion extending linearly from the circumferential center of the first portion 71b to the peripheral edge of the first holder through hole 66c. The second portion 71c passes between the second holder through holes 66d adjacent in the circumferential direction. The third portion 71d is a portion that extends in an arc shape from the radially inner end portion of the second portion 71c along the peripheral edge portion of the first holder through hole 66c. The fourth portion 71e is a portion that extends radially outward from the end of the third portion 71d opposite to the side where the second portion 71c is connected. A gripping portion 76 is connected to the radially outer end portion of the fourth portion 71e.

  The second bus bar 72 is disposed on the opposite side in the radial direction with respect to the first bus bar 71 with the central axis J interposed therebetween. The second bus bar 72 includes a main body portion 72 a, two gripping portions 76, and a terminal portion 77. The main body 72a is in the form of an elongated plate that extends along a plane perpendicular to the vertical direction. The plate surface of the main body 72a is orthogonal to the vertical direction. The main body portion 72a includes a first portion 72b, a second portion 72c, a third portion 72d, and a fourth portion 72e.

  The first portion 72 b is disposed on the radially inner side of the first portion 71 b of the first bus bar 71. The first portion 72b is a portion that extends linearly along the radial direction from the same radial position as the second holder through-hole 66d to the peripheral edge of the first holder through-hole 66c. The direction in which the first portion 72b extends is parallel to the direction in which the second portion 71c of the first bus bar 71 extends. The radially outer end portion of the first portion 72b is disposed between the second holder through holes 66d that are the same as the second holder through holes 66d through which the second portion 71c of the first bus bar 71 passes. A grip 76 is connected to the radially outer end of the first portion 72b.

  The second portion 72c is a portion that extends in an arc from the radially inner end of the first portion 72b along the peripheral edge of the first holder through hole 66c. The second portion 72c is disposed on the opposite side in the radial direction across the third portion 71d of the first bus bar 71 and the central axis J. The third portion 72d extends from the end of the second portion 72c opposite to the side where the first portion 72b is connected to the outer side in the radial direction than the second holder through hole 66d. The third portion 72d passes between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radial center of the third portion 72d.

  The fourth portion 72e is a portion that extends linearly from the radially outer end of the third portion 72d in a direction substantially perpendicular to the direction in which the third portion 72d extends in plan view. A terminal portion 77 is connected to the end of the fourth portion 72e opposite to the side to which the third portion 72d is connected.

  The third bus bar 73 includes a main body portion 73 a, two gripping portions 76, and a terminal portion 77. The main body portion 73a has an elongated plate shape extending along a plane orthogonal to the vertical direction. The plate surface of the main body portion 73a is orthogonal to the vertical direction. The main body 73a has a first portion 73b, a second portion 73c, and a third portion 73d.

  The first portion 73b is a portion extending in a substantially arc shape along the circumferential direction at the radially outer edge portion of the bus bar holder main body 66. The first portion 73b extends over a substantially half circumference in the circumferential direction. A part of the first portion 73 b is disposed on the radially outer side of the first portion 71 b of the first bus bar 71. A terminal portion 77 is connected to one circumferential end of the first portion 73b.

  The second portion 73c is a portion extending radially inward from the other circumferential end of the first portion 73b. The radially inner end of the second portion 73c is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the second portion 73c. The third portion 73d is a portion extending radially inward from a portion near the one end portion in the circumferential direction of the first portion 73b. The radially inner end of the third portion 73d is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the third portion 73d.

  The fourth bus bar 74 includes a main body portion 74 a and three gripping portions 76. The main body 74a has an elongated plate shape that extends along a plane perpendicular to the vertical direction. The plate surface of the main body 74a is orthogonal to the vertical direction. The main body 74a has a first portion 74b, a second portion 74c, a third portion 74d, and a fourth portion 74e.

  The first portion 74b is a portion extending in a substantially arc shape along the circumferential direction on the radially outer side than the second holder through hole 66d. The radial position of the first portion 74 b is substantially the same as the radial position of the first portion 71 b of the first bus bar 71. The first portion 74 b is disposed on the radially outer side of the second portion 72 c of the second bus bar 72.

  The second portion 74c is a portion extending radially inward from one circumferential end of the first portion 74b. The radially inner end of the second portion 74c is disposed between the second holder through holes 66d adjacent in the circumferential direction. A grip portion 76 is connected to the radially inner end of the second portion 74c. The third portion 74d is a portion extending radially inward from the circumferential center of the first portion 74b. The radially inner end of the third portion 74d is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the third portion 74d. The fourth portion 74e is a portion extending radially inward from the other circumferential end of the first portion 74b. The radially inner end of the fourth portion 74e is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end of the fourth portion 74e.

  The fifth bus bar 75 is disposed on the opposite side of the radial direction across the central axis J with respect to the fourth bus bar 74. The fifth bus bar 75 includes a main body portion 75 a and three gripping portions 76. The main body 75a is an elongated plate that extends along a plane perpendicular to the vertical direction. The plate surface of the main body 75a is orthogonal to the vertical direction. The main body 75a has a first portion 75b, a second portion 75c, a third portion 75d, and a fourth portion 75e.

  The first portion 75b is a portion extending in a substantially arc shape along the circumferential direction on the radially outer side than the second holder through hole 66d. The radial position of the first portion 75 b is substantially the same as the radial position of the first portion 71 b of the first bus bar 71. The first portion 74 b is disposed on the radially outer side of the third portion 71 d of the first bus bar 71.

  The second portion 75c is a portion extending radially inward from one circumferential end of the first portion 75b. The radially inner end of the second portion 75c is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the second portion 75c. The third portion 75d is a portion that extends radially inward from the circumferential center of the first portion 75b. The radially inner end of the third portion 75d is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the third portion 75d. The fourth portion 75e is a portion extending radially inward from the other circumferential end of the first portion 75b. The radially inner end of the fourth portion 75e is disposed between the second holder through holes 66d adjacent in the circumferential direction. A gripping portion 76 is connected to the radially inner end portion of the fourth portion 75e.

  In the present embodiment, the shape of the fifth bus bar 75 is the same as the shape of the fourth bus bar 74. The fifth bus bar 75 and the fourth bus bar 74 are arranged point-symmetrically about the central axis J in plan view. The vertical positions of the main body portions 71a to 75a described above are the same. In the following description, when the bus bars 70 are not distinguished, the main body portions 71a to 75a of the bus bars 70 are collectively referred to as a main body portion 70a.

  As described above, the terminal portions 77 are provided on the first bus bar 71, the second bus bar 72, and the third bus bar 73, respectively. That is, in the present embodiment, three terminal portions 77 are provided. The terminal portion 77 extends upward from the main body portion 70a. The plate surface of the terminal portion 77 is orthogonal to the circumferential direction. As shown in FIG. 1, the upper end of the terminal portion 77 is electrically connected to the control device 80. As shown in FIG. 3, the three terminal portions 77 are arranged at equal intervals along the circumferential direction.

  The gripping part 76 is a part that grips the conducting wire 43a. As described above, the gripping portion 76 is provided on each bus bar 70. The gripping part 76 is connected to the main body part 70a. In the present embodiment, twelve gripping portions 76 are provided. As shown in FIG. 4 and FIG. 5, the planar view shape of the grip portion 76 is a substantially U-shape that opens outward in the radial direction. The plate surface of the grip portion 76 is parallel to the vertical direction. Each gripping portion 76 is disposed at a position overlapping the second holder through hole 66d in plan view. As shown in FIG. 2, the gripping part 76 is disposed above the main body part 70a.

  FIG. 4 shows a state before the gripping part 76 grips the conducting wire 43a. FIG. 5 shows a state where the gripping part 76 grips the conducting wire 43a. Hereinafter, the configuration of the gripping portion 76 will be described in a state where the gripping portion 76 grips the conductive wire 43a unless otherwise specified. As shown in FIG. 5, the gripping portion 76 includes a first arm portion 76a and a second arm portion 76b, and a connecting portion 76c.

  The first arm portion 76a and the second arm portion 76b extend in parallel along a predetermined direction. In the present embodiment, the predetermined direction is the radial direction. The connecting portion 76c connects one end of the first arm portion 76a and one end of the second arm portion 76b. In the present embodiment, the connecting portion 76c connects the radially inner end of the first arm portion 76a and the radially inner end of the second arm portion 76b. The connecting portion 76c has a semicircular arc shape that protrudes radially inward.

  In this specification, “the first arm portion and the second arm portion extend in parallel along a predetermined direction” means that the first arm portion and the second arm portion may extend side by side in substantially the same direction. The direction in which the first arm extends and the direction in which the second arm extends may not be strictly parallel. Further, the first arm portion and the second arm portion do not have to extend linearly as long as they are along a predetermined direction.

  The first arm portion 76a and the second arm portion 76b sandwich the lead wire 43a in a state where at least one of the first arm portion 76a and the second arm portion 76b is in contact with the lead wire 43a. That is, the conducting wire 43a is sandwiched between the first arm portion 76a and the second arm portion 76b. In the present embodiment, both the first arm portion 76a and the second arm portion 76b are in contact with the conducting wire 43a.

  The second arm portion 76b extends linearly from the connecting portion 76c along the radial direction. More specifically, the second arm portion 76b extends linearly outward from the connecting portion 76c in the radial direction. The second arm portion 76b is connected to the main body portion 70a.

  The first arm portion 76a has a straight portion 76d and a bent portion 76e. The straight portion 76d extends linearly along the radial direction from the connecting portion 76c. More specifically, the straight portion 76d extends linearly outward from the connecting portion 76c in the radial direction. As described above, the linear portion 76d and the second arm portion 76b extend radially outward from the connecting portion 76c, so that the grip portion 76 is opened radially outward in the state before gripping the conducting wire 43a as shown in FIG. To do. Therefore, for example, in the step of installing the bus bar 70 with respect to the stator 40, when the lead wire 43a is pulled out or bent and inserted between the first arm portion 76a and the second arm portion 76b, the lead wire 43a is reduced in diameter. It can insert between the 1st arm part 76a and the 2nd arm part 76b from the direction outer side. Thereby, it is easy to insert the conducting wire 43a between the first arm portion 76a and the second arm portion 76b.

  The first arm portion 76a and the second arm portion 76b oppose each other in the circumferential direction. Therefore, the gap between the first arm portion 76a and the second arm portion 76b opens in the vertical direction. Thus, the bus bar 70 is inserted into the stator 40 while the conductor 43a is inserted between the first arm portion 76a and the second arm portion 76b by bringing the bus bar 70 closer to the conductor wire 43a extending upward. Can be installed on the upper side. At this time, since the first arm portion 76a and the second arm portion 76b are in an opened state as shown in FIG. 4, the gap between the first arm portion 76a and the second arm portion 76b is wide, and the bus bar 70 is led. When approaching 43a, it is easy to insert the conducting wire 43a between the first arm portion 76a and the second arm portion 76b.

  As shown in FIG. 5, in the present embodiment, the extending direction of the straight portion 76d is parallel to the extending direction of the second arm portion 76b. The dimension in the radial direction of the straight part 76d is equal to or larger than the dimension in the radial direction of the second arm part 76b. In FIG. 5, the radial dimension of the straight portion 76d is the same as the radial dimension of the second arm portion 76b. In the present specification, “the radial dimension of the linear portion is the same as the radial dimension of the second arm portion” means that the radial dimension of the linear portion is the radial dimension of the second arm portion. In addition to the case where they are exactly the same, the case where the dimension in the radial direction of the straight portion is substantially the same as the dimension in the radial direction of the second arm portion is also included.

  The bent portion 76e is bent in a direction approaching the second arm portion 76b from the tip of the straight portion 76d. In the present embodiment, the tip of the straight portion 76d is the radially outer end of the straight portion 76d. The bent portion 76e is inclined in the direction toward the second arm portion 76b toward the radially outer side and extends linearly. The angle θ formed by the straight portion 76d and the bent portion 76e is an obtuse angle. The extending length of the bent portion 76e is smaller than the extending length of the straight portion 76d. The bent portion 76e faces the conductive wire 43a. More specifically, the bent portion 76e is opposed to the conducting wire 43a in the radial direction via a gap.

  When gripping the lead wire 43a by the gripping portion 76, the first arm 76a and the second arm portion 76b are displaced from the state shown in FIG. 4 to the state shown in FIG. The conducting wire 43a is sandwiched between the portion 76a and the second arm portion 76b. In the present embodiment, the connecting portion 76c is plastically deformed to bring the first arm portion 76a closer to the second arm portion 76b. Since the gripping portion 76 is U-shaped, when the lead wire 43a is sandwiched between the first arm portion 76a and the second arm portion 76b, the lead wire 43a is on the side where the U-shaped gripping portion 76 opens, that is, the main wire 43a. In the embodiment, it is easy to receive a force from each arm portion radially outward. Thereby, in the simple U-shaped gripping part, the lead wire 43a may come out from between the first arm part and the second arm part.

  On the other hand, in this embodiment, the 1st arm part 76a has the bending part 76e facing the conducting wire 43a. Therefore, the bent portion 76e can suppress the lead wire 43a from coming out from between the first arm portion 76a and the second arm portion 76b. Thereby, it is easy to grip the conducting wire 43a by the gripping portion 76, and it is easy to fix the conducting wire 43a and the bus bar 70. Therefore, according to the present embodiment, the motor 10 including the bus bar 70 having a structure capable of easily fixing the conducting wire 43a of the stator 40 is obtained.

  Specifically, in the present embodiment, the bent portion 76e faces the conducting wire 43a in the radial direction. Therefore, when the lead wire 43a is sandwiched between the arms, even if the lead wire 43a moves radially outward from the position shown in FIG. 5, the lead wire 43a is caught by the bent portion 76e, and the first arm portion 76a and the second arm The lead wire 43a can be prevented from coming out from between the portion 76b.

  The bent portion 76e is disposed on the radially outer side than the second arm portion 76b. That is, the radial dimension of the first arm portion 76a is larger than the radial dimension of the second arm portion 76b. For example, when the radial dimension of the first arm part is equal to or smaller than the radial dimension of the second arm part, when the first arm part and the second arm part are brought close to each other, the tip of the bent part is the surface of the second arm part. In this case, the gap between the second arm portion and the straight portion may be larger than the wire diameter D of the conducting wire 43a in contact with the facing surface 76f on the side facing the first arm portion. In this case, the conducting wire 43a may not be in contact with both the first arm portion and the second arm portion, and the conducting wire 43a and the grip portion may not be electrically connected.

  On the other hand, in this embodiment, by making the radial dimension of the first arm portion 76a larger than the radial dimension of the second arm portion 76b, the distal end of the bent portion 76e becomes the second arm portion 76b. It can suppress contacting the opposing surface 76f. Therefore, as shown in FIG. 5, the first arm portion 76a and the second arm portion 76b can be brought close to each other until the linear portion 76d and the second arm portion 76b come into contact with the conducting wire 43a. Therefore, it is easy to electrically connect the conducting wire 43a and the grip portion 76.

  Further, according to the present embodiment, since the second arm portion 76b is connected to the main body portion 70a, the first arm portion 76a having the bent portion 76e is brought close to the second arm portion 76b, and the lead wire 43a is moved to the first arm. It is sandwiched between the portion 76a and the second arm portion 76b. In this case, the conducting wire 43a first contacts the straight portion 76d of the first arm portion 76a, and the conducting wire 43a is pushed toward the second arm portion 76b by the straight portion 76d. At this time, the conducting wire 43a may move radially outward along the straight portion 76d. On the other hand, in the present embodiment, since the bent portion 76e is provided in the first arm portion 76a, even if the lead wire 43a moves radially outward along the straight portion 76d, the lead wire 43a is formed by the bent portion 76e. The escape from between the first arm portion 76a and the second arm portion 76b can be suppressed. Therefore, it is easier to grip the conducting wire 43a by the gripping portion 76, and it is easier to fix the conducting wire 43a and the bus bar 70.

  Further, according to the present embodiment, since the radial dimension of the straight part 76d is equal to or larger than the radial dimension of the second arm part 76b, the distal end of the bent part 76e is in the radial direction with the distal end of the second arm part 76b. Easy to face. As a result, the opening of the grip portion 76 facing outward in the radial direction can be easily closed by the bent portion 76e, and the lead wire 43a moves outward in the radial direction and more easily escapes between the first arm portion 76a and the second arm portion 76b. Can be suppressed.

  In addition, for example, as the radial dimension of the straight part 76d becomes larger than the radial dimension of the second arm part 76b, the bent part 76e is arranged at a position farther outward in the radial direction than the second arm part 76b. Therefore, the radial distance L between the bent portion 76e and the second arm portion 76b increases. When the distance L becomes larger than the wire diameter D of the conducting wire 43a, the conducting wire 43a may come out between the bent portion 76e and the second arm portion 76b. On the other hand, according to the present embodiment, the radial dimension of the straight portion 76d is the same as the radial dimension of the second arm portion 76b. Therefore, it is easy to arrange the bent portion 76e near the second arm portion 76b, and the distance L can be suppressed from becoming larger than the wire diameter D of the conducting wire 43a. Thereby, it can suppress more that the conducting wire 43a slips out between the 1st arm part 76a and the 2nd arm part 76b.

  In the present embodiment, the distal end of the bent portion 76e is disposed on the radially outer side of the second arm portion 76b. The bent portion 76e faces the tip of the second arm portion 76b in the radial direction. Therefore, the opening of the gripping portion 76 facing outward in the radial direction can be blocked by the bent portion 76e. Therefore, it can suppress more that the conducting wire 43a slips out between the 1st arm part 76a and the 2nd arm part 76b.

  Here, for example, when the angle θ is a right angle or an acute angle, consider a case where the bent portion 76e faces the tip of the second arm portion 76b in the radial direction. In this case, the end of the bent portion 76e on the side connected to the straight portion 76d is located at the same position as the tip of the bent portion 76e in the radial direction, or radially outward from the tip of the bent portion 76e. Therefore, the radial dimension of the gripping portion 76 tends to increase.

  On the other hand, when the angle θ is an obtuse angle as in the present embodiment, the end portion of the bent portion 76e that is connected to the straight portion 76d is located radially inward from the tip of the bent portion 76e. Therefore, it is easy to reduce the radial dimension of the grip portion 76. When the angle θ is an obtuse angle, even if the radial dimension of the straight part 76d is smaller than the radial dimension of the second arm part 76b, the tip of the bent part 76e faces the second arm part 76b in the radial direction. It is possible to make it. In this case, the radial dimension of the grip portion 76 can be further reduced.

  In the present embodiment, the bent portion 76e and the second arm portion 76b are opposed to each other through the gap DP. The gap DP includes a portion where the distance in the direction in which the bent portion 76e and the second arm portion 76b face each other is smaller than the wire diameter D of the conducting wire 43a. Therefore, it can prevent that the conducting wire 43a passes through the gap DP. Therefore, it can suppress more that the conducting wire 43a slips out between the 1st arm part 76a and the 2nd arm part 76b. The distance L described above is a radial distance in a portion of the gap DP where the bent portion 76e and the second arm portion 76b face each other in the radial direction.

  In the present embodiment, each bus bar 70 is a single member. That is, the main body part 70a and the grip part 76 are a single member. Therefore, it can suppress that a number of parts increases, and can suppress that the manufacturing cost of the motor 10 increases. In this embodiment, the bus bar 70 is manufactured by, for example, bending a plate member by press working.

  The holding part 76 and the conducting wire 43a are fixed to each other and electrically connected by welding, for example. Specifically, as shown in FIG. 5, the first arm portion 76a, the lead wire 43a, and the second arm portion 76b in a state where the lead wire 43a is sandwiched in the circumferential direction by the first arm portion 76a and the second arm portion 76b. Is sandwiched between the two electrodes in the circumferential direction, and resistance welding is performed to fix the gripping portion 76 and the conductive wire 43a. However, the fixing of the gripping portion 76 and the conductive wire 43a is not limited to resistance welding. For example, it may be fixed by welding other than resistance welding such as arc welding, plastic deformation such as caulking, soldering, adhesion with a conductive adhesive, or the like.

  As shown in FIG. 1, the control device 80 is disposed on the upper side of the stator 40. The control device 80 controls the current supplied to the stator 40 via the bus bar 70. Therefore, the rotation speed of the motor 10 can be controlled. The control device 80 is connected to an external power source (not shown).

  The present invention is not limited to the above-described embodiment, and other configurations can be employed. In the following description, the same configurations as those described above may be omitted by appropriately attaching the same reference numerals.

  If the radial dimension of the first arm part 76a is larger than the radial dimension of the second arm part 76b, the radial dimension of the straight part 76d may be smaller than the radial dimension of the second arm part 76b. . Further, the first arm portion 76a may be connected to the main body portion 70a. The main body portion 70a and the grip portion 76 may be separate members. The bent portion 76e may not face the second arm portion 76b in the radial direction. The angle θ formed by the straight portion 76d and the bent portion 76e may be a right angle or an acute angle.

  The first arm portion 76a and the second arm portion 76b may extend radially inward from the connecting portion 76c. Further, the predetermined direction is not limited to the radial direction, and may be any direction. The first arm portion 76a and the second arm portion 76b may be in direct contact with each other. Specifically, for example, the bent portion 76e may contact the distal end of the second arm portion 76b, that is, the radially outer end of the second arm portion 76b in the present embodiment. In this case, it can suppress more that the conducting wire 43a slips out between the 1st arm part 76a and the 2nd arm part 76b. In the present embodiment, the conductive wire 43a has been described as a round wire, but is not limited thereto. The conducting wire may be a square wire or a flat wire, or may have another shape.

  Next, an embodiment of an apparatus on which the motor 10 of this embodiment is mounted will be described. In the present embodiment, an example in which the motor 10 is mounted on an electric power steering device will be described. The electric power steering apparatus 2 shown in FIG. 6 is mounted on a steering mechanism for a vehicle wheel. The electric power steering device 2 is a device that reduces the steering force by hydraulic pressure. The electric power steering apparatus 2 includes a motor 10, a steering shaft 214, an oil pump 216, and a control valve 217.

  The steering shaft 214 transmits the input from the steering 211 to the axle 213 having the wheels 212. The oil pump 216 generates hydraulic pressure in the power cylinder 215 that transmits the hydraulic driving force to the axle 213. The control valve 217 controls the oil of the oil pump 216. In the electric power steering apparatus 2, the motor 10 is mounted as a drive source for the oil pump 216.

  The motor of the above-described embodiment is not limited to the electric power steering device, and may be mounted on any device.

  The above-described configurations can be appropriately combined within a range that does not contradict each other.

  DESCRIPTION OF SYMBOLS 2 ... Electric power steering apparatus, 10 ... Motor, 30 ... Rotor, 31 ... Shaft, 40 ... Stator, 43a ... Conductor, 70 ... Bus bar, 70a, 71a, 72a, 73a, 74a, 75a ... Main-body part, 76 ... Gripping part 76a ... first arm portion, 76b ... second arm portion, 76c ... coupling portion, 76d ... straight portion, 76e ... bent portion, 80 ... control device, 211 ... steering, D ... wire diameter, DP ... gap, J ... Center axis, L ... Distance

Claims (12)

A rotor having a shaft disposed along a central axis;
A stator that is disposed radially outside the rotor and wound with a conducting wire;
A bus bar electrically connected to the conducting wire;
With
The bus bar has a gripping part for gripping the conducting wire,
The gripping part is
A first arm and a second arm extending in parallel along a predetermined direction;
A connecting portion that connects one end of the first arm portion and one end of the second arm portion;
Have
The conductor is sandwiched between the first arm and the second arm;
At least one of the first arm portion and the second arm portion is in contact with the conducting wire,
The first arm is
A straight portion extending linearly from the connecting portion along the predetermined direction;
A bent portion bent in a direction approaching the second arm portion from the tip of the straight portion;
Have
The bent portion is opposed to the conducting wire,
The dimension of the said 1st arm part in the said predetermined direction is a motor larger than the dimension of the said 2nd arm part in the said predetermined direction. The bus bar further includes a main body portion to which the grip portion is connected,
The motor according to claim 1, wherein the second arm portion is connected to the main body portion.   The motor according to claim 2, wherein the main body portion and the grip portion are a single member.   4. The motor according to claim 1, wherein a dimension of the linear portion in the predetermined direction is not less than a dimension of the second arm portion in the predetermined direction.   The motor according to any one of claims 1 to 3, wherein a dimension of the linear portion in the predetermined direction is the same as a dimension of the second arm portion in the predetermined direction. The predetermined direction is a radial direction;
The motor according to any one of claims 1 to 5, wherein the straight portion and the second arm portion extend radially outward from the connecting portion.   The motor according to claim 6, wherein the bent portion faces the conductive wire in a radial direction.   The motor according to any one of claims 1 to 7, wherein the bent portion opposes a tip end of the second arm portion in the predetermined direction. The bent portion and the second arm portion are opposed to each other through a gap,
The motor according to any one of claims 1 to 8, wherein the gap includes a portion in which a distance in a direction in which the bent portion and the second arm portion face each other is smaller than a wire diameter of the conductive wire.   The motor according to any one of claims 1 to 9, wherein an angle formed by the straight portion and the bent portion is an obtuse angle.   The motor according to any one of claims 1 to 10, further comprising a control device that controls a current supplied to the stator via the bus bar.   An electric power steering apparatus comprising the motor according to any one of claims 1 to 11.

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