JP2014036561A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that enables a bus bar to be stably fastened to a fastening member when the bus bar is fastened to the fastening member.SOLUTION: A motor includes a control device 50 that is connected by a bus bar 41. In th motor, a bus bar positioning guide part is provided in the bus bar 41 and a fastening member 52 of the control device 50 to which the bus bar 41 is to be fastened. The bus bar positioning guide part comprises a tapered part 43 becoming thinner toward a tip formed at the leading end of the bus bar 41, and a tapered recess 56 corresponding to the tapered part 43 formed in the fastening member 52.

Description

  The present invention relates to a rotating electrical machine including a control device connected by a bus bar.

  The rotating electrical machine detects the rotational position of the rotor, and sequentially energizes the coils on the stator side based on the detected rotational position of the rotor to drive the rotor to rotate. Such a rotating electrical machine is connected to a control device. The rotating electrical machine sends a rotor position detection signal to the control device. On the other hand, the control device supplies electric power for exciting the stator coil to the rotating electrical machine (see, for example, Patent Document 1).

  A control device is mounted on and integrated with the rotating electric machine. And the rotary electric machine and the control apparatus are connected by fastening the bus bar of the quantity according to the number of phases from the bus bar module of the rotary electric machine to the connection terminal of the control apparatus.

  The connection terminal of the control device is a fastening portion that fastens the screw. The bus bar is connected to the control device by inserting the screw through the screw insertion hole formed in the bus bar and fastening the screw to the fastening portion.

JP 2008-79469 A

  By the way, since the bus bar is fastened with a degree of freedom with respect to the fastening portion, the lateral deviation tends to increase in the longitudinal direction and may interfere with the fastening portion. Therefore, the shape of the screw insertion hole of the bus bar is an ellipse, and a margin is provided in the width direction. However, since the thickness of the bus bar in the width direction is reduced by the screw insertion hole, the contact area between the screw and the bus bar is reduced, and the axial force is hardly generated. For this reason, when the bus bar is fastened to the fastening member including the fastening portion, the fastening state of the bus bar has to be confirmed. Therefore, there has been a demand for a rotating electrical machine that can perform stable fastening when fastening a bus bar to a fastening member.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotating electrical machine capable of performing stable fastening when a bus bar is fastened to a fastening member.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, in a rotating electrical machine including a control device connected by a bus bar, a bus bar positioning guide portion is provided on the bus bar and a fastening member of the control device to which the bus bar is fastened. Is the gist.

  According to this configuration, since the bus bar positioning guide portion is provided on the bus bar and the fastening member of the control device, when the bus bar is inserted into the fastening member, the bus bar is guided and positioned by the bus bar positioning guide portion. For this reason, since it is not necessary to provide a margin in the width direction of the screw insertion hole, a contact area between the screw and the bus bar can be ensured. Therefore, stable fastening can be performed when the bus bar is fastened to the fastening member.

  According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the bus bar positioning guide portion includes a tapered portion formed at a front end of the bus bar and becomes thinner toward the front end of the bus bar, and the fastening member. The gist of the invention is to include a tapered recess corresponding to the formed tapered portion.

  According to this configuration, as the bus bar positioning guide portion, the tapered portion is formed at the front end of the bus bar, and the tapered recess corresponding to the tapered portion is formed in the fastening member. Therefore, when the bus bar is inserted into the fastening member, the bus bar is tapered. Is guided to the fastening position and is reliably positioned.

  According to a third aspect of the present invention, in the rotating electric machine according to the first or second aspect, the bus bar positioning guide portion includes a front end of the bus bar and a contact portion with which the front end of the bus bar of the fastening member abuts. The gist is that the concavo-convex portion is formed on the surface.

  According to this configuration, as the bus bar positioning guide portion, the concave and convex portions are formed at the front end of the bus bar and the abutting portion where the front end of the bus bar of the fastening member abuts. It is surely positioned by being guided to the fastening position by the portion.

  According to a fourth aspect of the present invention, in the rotating electrical machine according to any one of the first to third aspects, the bus bar positioning guide portion is a housing recess that houses a front end of the bus bar formed in the fastening member. It is the gist of that.

  According to the same configuration, as the bus bar positioning guide portion, the receiving recess is formed in the fastening member for receiving the tip of the bus bar. Therefore, when the bus bar is inserted into the fastening member, the bus bar is reliably guided to the fastening position by the receiving recess. Positioned.

  According to a fifth aspect of the present invention, in the rotating electrical machine according to any one of the first to fourth aspects, a surface including a fastening portion that fastens the bus bar of the fastening member is a tip in a longitudinal direction of the bus bar. The gist is that the side is a forward inclined surface.

  According to this configuration, the surface including the fastening portion that fastens the bus bar of the fastening member is an inclined surface whose front end side is inclined forward in the longitudinal direction of the bus bar. For this reason, when the bus bar is inserted into the fastening member, the bus bar is warped by the inclined surface, so that a biasing force is generated on the fastening portion side. Then, since the bus bar comes into contact with the inclined surface of the fastening member with certainty, the contact area can be stabilized, and the axial force between the screw and the bus bar can be secured at the time of fastening with the screw.

  According to the present invention, when a bus bar is fastened to a fastening member in a rotating electrical machine, stable fastening can be performed.

The figure which shows schematic structure of a motor. The figure which shows the shape of a bus-bar module. The perspective view which shows the fastening member, bus bar, and screw of a control apparatus. Sectional drawing which shows the assembly | attachment state of the bus bar to the fastening member of a control apparatus. The perspective view which shows the fastening member, bus bar, and screw of a control apparatus. The perspective view which shows the fastening member, bus bar, and screw of a control apparatus. Sectional drawing which shows the assembly | attachment state of the bus bar to the fastening member of a control apparatus.

(First embodiment)
A first embodiment in which a rotating electrical machine according to the present invention is embodied as a motor will be described below with reference to FIGS.

  As shown in FIG. 1, a motor 1 is a brushless provided with a cylindrical housing 2, a stator 3 accommodated in the housing 2, and a rotor 4 rotatably supported inside the stator 3 in the radial direction. It is configured as a motor.

  More specifically, the housing 2 includes a bottomed cylindrical housing main body 11 that is open on one end side, and an annular cover member 12 that is provided so as to close the open end of the housing main body 11.

  The stator 3 includes an annular portion 13 that is fixed to the inner periphery of the housing body 11 and a stator core 15 that includes a plurality of (in the present embodiment, twelve) teeth 14 that extend radially inward from the annular portion 13. . The stator 3 includes a coil 17 wound around each tooth 14 via an insulator 16.

  As shown in FIG. 2, the connection end 17 a of the coil 17 is connected to the bus bar module 40. The bus bar module 40 includes a plurality of bus bars 41 protruding to the outside of the cover member 12.

  On the other hand, the rotor 4 has a cylindrical rotor core 22 that is externally fitted to the rotary shaft 21 and rotates integrally with the rotary shaft 21, and a plurality (ten in this embodiment) of permanent magnets fixed to the outer periphery of the rotor core 22. 23. Each permanent magnet 23 is formed in a rectangular plate shape, and is arranged so that different polarities (N pole, S pole) are alternately arranged in the circumferential direction. A bearing 25 a is provided on the bottom 11 a of the housing body 11. The cover member 12 is provided with a bearing 25b. The rotor 4 is rotatably supported on the inner periphery of the stator 3 by bearings 25a and 25b.

  A resolver 31 that detects the rotation angle of the rotor 4 is disposed coaxially with the rotor core 22 on the upper end side of the rotating shaft 21. The resolver 31 includes a resolver rotor 32 that is fixed to the rotary shaft 21 so as to be integrally rotatable, and an annular resolver stator 33 that is disposed on the outer periphery of the resolver rotor 32. The resolver rotor 32 is fixed to the rotary shaft 21 in a state where the phase with respect to the permanent magnet 23 is matched.

  Specifically, the resolver stator 33 includes a resolver core 34 formed by laminating a plurality of magnetic steel plates, and a resolver coil 36 wound around the resolver core 34 via an insulator 35, and is formed on the cover member 12. It is fixed in a hole-shaped resolver accommodating portion 37.

  In the motor 1 configured as described above, three-phase (U, V, W) driving power corresponding to the rotation angle of the rotor 4 detected by the resolver 31 is supplied to each coil 17 via the bus bar 41. As a result, a rotating magnetic field is generated. The rotor 4 is configured to rotate based on the relationship between the rotating magnetic field and the magnetic flux of each permanent magnet 23.

  A control device 50 that controls the driving of the motor 1 is placed on the top of the housing 2. A fastening member 52 including a metal fastening portion 53 that fastens the bus bar 41 is fixed to a side surface of the case 51 of the control device 50. The fastening portion 53 is formed with a female screw 54 that fastens the bus bars 41 by screwing screws 60. The fastening portion 53 is electrically connected within the control device 50.

  As shown in FIG. 1, a convex portion 52 a is formed on the front upper portion of the fastening member 52 in the drawing. That is, the fastening member 52 is formed in an inverted L shape in a side view. Further, on the front surface 52b of the fastening member 52, a fastening portion 53 for fastening each bus bar 41 is fitted, and a partition portion 55 for insulating ridges is formed so as to sandwich the fastening portion 53. The front surface of the fastening member 52 and the front surface of the fastening portion 53 are formed on the same surface.

  Near the tip of the bus bar 41, an oval screw insertion hole 42 for inserting the screw 60 is formed. The inner diameter in the width direction of the screw insertion hole 42 is substantially the same as the diameter of the screw portion 61 of the screw 60. The screw insertion hole 42 is formed at a position corresponding to the fastening portion 53. At the tip of the bus bar 41, a tapered portion 43 that is tapered toward the tip is formed.

  A tapered recess 56 corresponding to the tapered portion 43 at the tip of the bus bar 41 is formed in the lower portion of the convex portion 52 a of the fastening member 52. These tapered recesses 56 position the bus bar 41 so that the bus bar 41 is not displaced with respect to the fastening portion 53 in the width direction. That is, the tapered portion 43 of the bus bar 41 and the tapered recess 56 of the fastening member 52 function as a bus bar positioning portion.

  As shown in FIG. 4, the surface 52 b including the fastening portion 53 of the fastening member 52 is an inclined surface 52 b inclined forward so that the front end side protrudes in the longitudinal direction of the bus bar 41. That is, the inclined surface 52b of the fastening member 52 is inclined in the direction opposite to the screw fastening direction. Note that the gradient (the gradient height h (corresponding to the vertical distance) with respect to the vertical distance L (corresponding to the horizontal distance) of the inclined surface) is determined so as to obtain the required fastening torque. For this reason, when the bus bar 41 is inserted into the fastening member 52, the bus bar 41 is warped by the inclined surface 52b, so that a biasing force (arrow in the figure) is generated toward the fastening portion 53 side. The gradient is convenient because it can also be used as a draft of the mold during resin molding.

Next, fastening of the bus bar 41 configured as described above and the fastening member 52 will be described with reference to FIGS. 3 and 4.
As shown in FIGS. 3 and 4, when the control device 50 is assembled to the motor 1, the bus bar 41 is inserted into the fastening member 52 of the control device 50, and the bus bar 41 is attached to the fastening portion 53 with the screw 60. By fastening, the motor 1 and the control apparatus 50 are electrically connected.

  First, each bus bar 41 is inserted between the partition portions 55 of the fastening member 52 from below. And the front-end | tip of the bus-bar 41 is made to contact | abut to the lower part of the convex part 52a of the fastening member 52. FIG. As a result, the tapered portion 56 formed at the lower portion of the fastening member 52 is guided by being brought into contact with the tapered portion 43 at the tip of the bus bar 41 and positioned in the width direction of the bus bar 41. At this time, the position of the bus bar 41 in the longitudinal direction is determined by the front end of the bus bar 41 coming into contact with the lower portion of the fastening member 52.

  Further, since the bus bar 41 is warped by the inclined surface 52b of the fastening member 52, an urging force (arrow in the figure) is generated toward the fastening portion 53 side. Then, the bus bar 41 reliably contacts the inclined surface 52b of the fastening member 52.

  Then, the bus bar 41 is fastened to the fastening portion 53 by inserting the screw portion 61 of the screw 60 into the screw insertion hole 42 of the bus bar 41 and screwing the screw portion 61 into the female screw 54 of the fastening portion 53. The screw 60 is in contact with the bus bar 41 at a portion where the screw insertion hole 42 of the bus bar 41 is formed.

  Now, the positioning of the bus bar 41 is reliably performed by the tapered portion 43 of the bus bar 41 and the tapered concave portion 56 of the fastening member 52, and the bus bar 41 and the inclined surface 52b are reliably in contact with each other by the inclined surface 52b of the fastening member 52. The contact area can be stabilized, and the axial force between the screw 60 and the bus bar 41 can be ensured when the screw 60 is fastened. Therefore, stable fastening can be performed.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) Since the bus bar positioning guide portion is provided on the bus bar 41 and the fastening member 52 of the control device 50, when the bus bar 41 is inserted into the fastening member 52, the bus bar 41 is guided and positioned by the bus bar positioning guide portion. . For this reason, since it is not necessary to provide a margin in the width direction of the screw insertion hole 42, a contact area between the screw 60 and the bus bar 41 can be ensured. Therefore, stable fastening can be performed when the bus bar 41 is fastened to the fastening portion 53.

  (2) As the bus bar positioning guide portion, the tapered portion 43 is formed at the front end of the bus bar 41 and the tapered concave portion 56 corresponding to the tapered portion 43 is formed in the fastening member 52, so that the bus bar 41 is inserted into the fastening member 52. The bus bar 41 is guided to the fastening position by the taper to be surely positioned.

  (3) The surface including the fastening portion 53 that fastens the bus bar 41 of the fastening member 52 is an inclined surface 52b whose front end side is inclined forward in the longitudinal direction of the bus bar 41. For this reason, when the bus bar 41 is inserted into the fastening member 52, the bus bar 41 is warped by the inclined surface 52b, so that a biasing force is generated toward the fastening portion 53 side. Then, the bus bar 41 reliably contacts the inclined surface 52 b of the fastening member 52, so that the contact area can be stabilized, and the axial force between the screw 60 and the bus bar 41 can be secured at the time of fastening with the screw 60.

(Second Embodiment)
A second embodiment in which the rotating electrical machine according to the present invention is embodied as a motor will be described below with reference to FIG. The rotating electrical machine of this embodiment differs from the first embodiment in the shape of the tip of the bus bar 41 and the shape of the lower portion of the convex portion 52a of the fastening member 52. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 5, a triangular recess 44 is formed at the center of the width direction at the tip of the bus bar 41 in addition to the tapered portion 43. In addition to the tapered recess 56 corresponding to the tapered portion 43 at the distal end of the bus bar 41, a triangular convex portion 57 corresponding to the recessed portion 44 at the distal end of the bus bar 41 is formed below the convex portion 52 a of the fastening member 52. ing. These convex portions 57 position the bus bar 41 so that the bus bar 41 is not displaced with respect to the fastening portion 53 in the width direction. That is, in addition to the tapered portion 43 of the bus bar 41 and the tapered concave portion 56 of the fastening member 52, the concave portion 44 of the bus bar 41 and the convex portion 57 of the fastening member 52 function as a bus bar positioning portion. In addition, the lower part of the convex part 52a of the fastening member 52 is equivalent to the contact part with which the front-end | tip of the bus bar 41 contacts.

Next, fastening of the bus bar 41 configured as described above and the fastening member 52 will be described.
First, each bus bar 41 is inserted between the partition portions 55 of the fastening member 52 from below. And the front-end | tip of the bus-bar 41 is made to contact | abut to the lower part of the convex part 52a of the fastening member 52. FIG. Then, the taper concave portion 56 formed in the lower portion of the fastening member 52 is guided by the taper portion 43 at the front end of the bus bar 41 coming into contact with the taper concave portion 56. The recess 44 is guided by the contact, and is positioned in the width direction of the bus bar 41. At this time, the position of the bus bar 41 in the longitudinal direction is determined by the front end of the bus bar 41 coming into contact with the lower portion of the fastening member 52.

  Further, since the bus bar 41 is warped by the inclined surface 52b of the fastening member 52, an urging force (arrow in the figure) is generated toward the fastening portion 53 side. Then, the bus bar 41 reliably contacts the inclined surface 52b of the fastening member 52.

As described above, according to the embodiment described above, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.
(4) As the bus bar positioning guide portion, the concave portion 44 is formed at the tip of the bus bar 41 and the convex portion 57 corresponding to the concave portion 44 at the tip of the bus bar 41 of the fastening member 52 is formed. When inserted, the bus bar 41 is guided to the fastening position by the concavo-convex portion and positioned reliably.

(Third embodiment)
A third embodiment in which the rotating electrical machine according to the present invention is embodied as a motor will be described below with reference to FIGS. 6 and 7. The rotating electrical machine of this embodiment is different from the first embodiment in the shape of the lower part of the convex portion 52a of the fastening member 52. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIGS. 6 and 7, a tapered portion 43 is formed at the tip of the bus bar 41. The convex portion 52a of the fastening member 52 is formed with an accommodating concave portion 58 that accommodates the tip of the bus bar 41. In these accommodating recesses 58, tapered recesses 56 are formed. These accommodating recesses 58 position the bus bar 41 so that the bus bar 41 is not displaced with respect to the fastening portion 53 in the width direction. That is, in addition to the taper portion 43 of the bus bar 41 and the taper recess 56 of the fastening member 52, the housing recess 58 of the fastening member 52 functions as a bus bar positioning portion.

Next, fastening of the bus bar 41 configured as described above and the fastening member 52 will be described.
First, each bus bar 41 is inserted between the partition portions 55 of the fastening member 52 from below. At this time, the front end of the bus bar 41 is inserted into the housing recess 58 of the protrusion 52 a of the fastening member 52. Then, the front end of the bus bar 41 is brought into contact with the tapered recess 56 of the accommodation recess 58. Then, the front end of the bus bar 41 is guided by being accommodated in the accommodating recess 58 formed in the convex portion 52a of the fastening member 52, and further, the bus bar 41 is guided to the tapered concave portion 56 of the accommodating recess 58 of the convex portion 52a of the fastening member 52. The leading end taper portion 43 is guided by contact and is positioned in the width direction of the bus bar 41. At this time, the position of the bus bar 41 in the longitudinal direction is determined by the front end of the bus bar 41 coming into contact with the lower portion of the fastening member 52.

  Further, since the bus bar 41 is warped by the inclined surface 52b of the fastening member 52, an urging force (arrow in the figure) is generated toward the fastening portion 53 side. Then, the bus bar 41 reliably contacts the inclined surface 52b of the fastening member 52.

As described above, according to the embodiment described above, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.
(5) As the bus bar positioning guide portion, the receiving recess 58 for receiving the tip of the bus bar 41 is formed in the fastening member 52, so that when the bus bar 41 is inserted into the fastening member 52, it is guided to the fastening position by the receiving recess 58. Is positioned reliably.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
-In above-mentioned 2nd Embodiment, although the recessed part 44 of the bus-bar 41 was made into triangular shape, you may employ | adopt other shapes, such as not only a triangular shape but semicircle shape. Further, the shape of the convex portion 57 of the convex portion 52a of the fastening member 52 may be other shapes corresponding to the shape of the concave portion 44 of the bus bar 41.

  In the second embodiment, the bus bar 41 is provided with the concave portion 44 and the fastening member 52 is provided with the convex portion 57. However, the bus bar 41 is provided with the convex portion, and the fastening member 52 is provided with the concave portion corresponding to the convex portion of the bus bar 41. May be provided.

  In the second embodiment, in addition to the tapered portion 43 and the tapered concave portion 56, which are a combination of tapers, the concave portion 44 and the convex portion 57, which are a combination of concave and convex portions, are provided. Good.

In the above configuration, the inclination angle of the inclined surface 52b of the fastening member 52 may be changed as appropriate.
In the above embodiment, the front surface 52b of the fastening member 52 is an inclined surface. However, if the axial force of the screw 60 can be ensured without being inclined, the inclined surface may not be used.

  DESCRIPTION OF SYMBOLS 1 ... Motor as rotary electric machine, 2 ... Housing, 3 ... Stator, 4 ... Rotor, 11 ... Housing main body, 12 ... Cover member, 13 ... Ring part, 14 ... Teeth, 15 ... Stator core, 16 ... Insulator, 17 ... Coil, 17a ... connection end, 21 ... rotating shaft, 21a ... upper end, 21b ... lower end, 22 ... rotor core, 23 ... permanent magnet, 25a ... bearing, 25b ... bearing, 31 ... resolver, 32 ... resolver rotor, 33 DESCRIPTION OF SYMBOLS ... Resolver stator, 34 ... Resolver core, 35 ... Insulator, 36 ... Resolver coil, 37 ... Resolver accommodating part, 40 ... Bus bar module, 41 ... Bus bar, 42 ... Screw insertion hole, 43 ... Taper part which comprises bus bar positioning guide part , 44... Recessed portion constituting the bus bar positioning guide, 50... Control device, 51. Case, 52. a ... convex portion, 52b ... inclined surface, 53 ... fastening portion, 54 ... female screw, 55 ... partitioning portion, 56 ... tapered concave portion constituting the bus bar positioning guide portion, 57 ... convex portion constituting the bus bar positioning guide portion, 58... Housing recess constituting the bus bar positioning guide, 60... Screw, 61.

Claims (5)

In a rotating electrical machine comprising a control device connected by a bus bar,
A rotating electric machine characterized in that a bus bar positioning guide portion is provided on the bus bar and a fastening member of the control device to which the bus bar is fastened. In the rotating electrical machine according to claim 1,
The bus bar positioning guide portion includes a tapered portion that is tapered toward the tip formed at the tip of the bus bar, and a tapered recess corresponding to the taper portion formed in the fastening member. Rotating electric machine. In the rotating electrical machine according to claim 1 or 2,
The bus bar positioning guide portion is a concave and convex portion formed on a front end of the bus bar and a contact portion with which the front end of the bus bar of the fastening member abuts. In the rotary electric machine according to any one of claims 1 to 3,
The bus bar positioning guide portion is a housing recess that houses a front end of the bus bar formed in the fastening member. In the rotary electric machine according to any one of claims 1 to 4,
The rotating electric machine characterized in that the surface including the fastening portion for fastening the bus bar of the fastening member is an inclined surface whose front end side is inclined forward in the longitudinal direction of the bus bar.

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