JP7329959B2 - Rotating electric machine - Google Patents

Description

The present invention relates to rotating electric machines.

As a background art of this technical field, there is Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2013-211945). In this publication, a bus bar connecting a plurality of concentrated winding stator coils is provided, the bus bar has an arm portion perpendicular to the longitudinal direction of the bus bar, and a coil holding portion is provided at the tip of the arm portion. , configure the vehicle motor so that the arm is provided with a mechanical twist (see abstract).

JP 2013-211945 A

In the busbar disclosed in Patent Document 1, the stator winding and the busbar terminal are electrically connected by welding. In order to suppress this, a structure is adopted in which the stator winding is mechanically held near the electromechanical connection, a crimping portion is provided in the busbar terminal, and the stator winding is crimped and fixed before welding.

However, in the conventional structure described in Patent Document 1, the stator winding may come off when the stator winding is crimped to the busbar terminal. Welding was sometimes imperfect.

SUMMARY OF THE INVENTION An object of the present invention is to improve connection reliability of a bus bar terminal. Another object of the present invention is to improve workability during welding.

In order to solve the above problems, the present invention employs, for example, the configurations described in the claims. The disclosure of the present application includes a plurality of means for solving the above problems. a busbar terminal comprising: a second holding portion having a first holding portion and an open side facing each other with the stator winding therebetween; the first holding portion and the A regulating portion projecting from the first holding portion is provided in at least a part of the space facing the second holding portion , and the stator winding is bent in the facing space to form two points with the regulating portion. It is characterized by contacting as above.

According to one aspect of the present invention, it is possible to improve the connection reliability of the busbar terminal. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a perspective view of a stator portion of a permanent magnet field brushless motor of this embodiment; FIG. FIG. 2 is a cross-sectional view of the stator portion of the permanent magnet field brushless motor of the present embodiment; FIG. 2 is an enlarged perspective view of a portion (A portion in FIG. 1) where a lead wire at the beginning of winding of the stator winding of the present embodiment is electrically connected to a busbar terminal of a terminal block; FIG. 4 is a front view of a state in which stator windings are passed between the bent portion and the restricting portion of the busbar terminal of the embodiment; FIG. 5 is a top view of the busbar terminal of the present embodiment as seen from the direction of arrow B in FIG. 4; FIG. 4 is a front view of the busbar terminal and stator windings before caulking according to the present embodiment; FIG. 7 is a top view of the busbar terminal of the present embodiment as seen from the direction of arrow C in FIG. 6; FIG. 7 is a top view seen from the direction of arrow C in FIG. 6 during caulking of the busbar terminal and the stator winding of the present embodiment; 1 is a front view of a conventional busbar terminal; FIG. 1 is a front view of a conventional busbar terminal; FIG. 1 is a front view of a busbar terminal of this embodiment; FIG. 1 is a front view of a busbar terminal of this embodiment; FIG.

An embodiment according to the present invention will be described below with reference to FIGS. 1 to 9. FIG.

FIG. 1 is a perspective view of a stator portion 100 of a permanent magnet field brushless motor of this embodiment, FIG. 2 is a cross-sectional view thereof, and FIG. 2 is an enlarged perspective view of a portion (A portion in FIG. 1) where a lead wire is electrically connected to a busbar terminal 7 of a terminal block 8; FIG. 1, 2, and 3 do not show the rotor section.

The stator section 100 has a stator core 1 and a housing 2 , and the stator core 1 is fixed to the housing 2 .

The stator core 1 has a plurality of salient magnetic pole portions 3 arranged at regular intervals over the entire circumference on the inner circumference side of the housing 2 . An insulator 4, which is an insulating member, is molded on the salient magnetic pole portion 3, and a stator winding 5 is wound around the insulator 4. As shown in FIG.

The terminal block 8 is formed by resin-molding a plurality of bus bars (not shown) for connecting the stator winding 5 to an external power supply and a plurality of insulators (not shown). is inserted into

The plurality of busbars form a plurality of busbar terminals 7 for electrically connecting lead wires at the start and end of the winding of the stator winding 5 . Each of the plurality of busbar terminals 7 and the lead wire are electrically connected by Tig welding or the like at the electromechanical connection portion 7a. A plurality of busbar terminals 7 are integrated toward the connector portion 6 of the terminal block 8 .

FIG. 4 is a front view of a state in which the stator winding 5 is passed between the bent portion 7b and the restricting portion 7c of the busbar terminal 7, and FIG. 5 is the busbar terminal viewed from the direction of arrow B in FIG. 7 is a top view of FIG.

As shown in FIGS. 4 and 5, the busbar terminal 7 and the stator winding 5 are held by caulking by a first holding portion 7d and a second holding portion 7e provided at opposing positions. The restricting portion 7c is provided protruding in the vicinity of the first holding portion 7d of the busbar terminal 7, and restricts the stator winding 5 from detaching to the right 9 in FIG. there is As a result, the stator winding 5 is arranged between the restricting portion 7c and the bent portion 7b in the space defined by the first holding portion 7d and the second holding portion 7e, and is difficult to separate. After crimping the busbar terminal 7, the busbar terminal 7 is electrically connected to the electromechanical connecting portion 7a and the stator winding 5 by Tig welding or the like.

The second holding portion 7e is connected to the first holding portion 7d via the bent portion 7b. In addition, as shown in FIG. 5, the second holding portion 7e is such that the distance 7f between the open end of the second holding portion 7e and the restricting portion 7c is equal to the thickness 5a of the stator winding 5 (e.g., cross section is formed to be smaller than the diameter of the circular electric wire and the length of the short side of the rectangular wire) to prevent the stator winding 5 from coming off.

6 is a front view of the busbar terminal 7 and the stator winding 5 before they are crimped, FIG. 7 is a top view of the busbar terminal 7 as seen from the direction of arrow C in FIG. 6, and FIG. FIG. 7 is a top view of the busbar terminal 7 and the stator winding 5 in the middle of crimping, as seen from the direction of arrow C in FIG. 6 ;

The stator winding 5 has a circular cross section. Note that the stator winding 5 only needs to have a cylindrical side surface, and may be, for example, a rectangular wire. As shown in FIG. 7, when the second holding portion 7e of the busbar terminal 7 is pressed in the crimping direction 10, the stator winding 5 moves rightward 9. As shown in FIG. Then, as shown in FIG. 8, the moving stator winding 5 comes into contact with the regulating portion 7c of the busbar terminal 7 and is regulated in position. Therefore, the regulating portion 7c has both the function of preventing the stator winding 5 from coming off and the function of regulating the position thereof.

The restricting portion 7c is preferably arranged at a position where the center of the stator winding 5 and the center of the electromechanical connection portion 7a of the busbar terminal 7 approximately coincide with each other when the stator winding 5 is in contact.

The busbar terminal 7 and the stator winding 5 are crimped, and the restricting portion 7c restricts the position of the stator winding 5, so that the stator winding 5 and the electromechanical connecting portion 7a are more stably TIG-welded. can.

Next, the conventional busbar terminal 7 and the busbar terminal 7 of the embodiment of the present invention will be compared and explained.

9A and 9B are front views of a conventional busbar terminal 7, and FIGS. 9C and 9D are front views of the busbar terminal 7 of this embodiment. FIG. 9A to FIG. 9D are front views in which the second holding portion 7e is not illustrated from the viewpoint of explanation.

As shown in FIG. 9A, in the conventional busbar terminal 7, the stator winding 5 is regulated by the regulating portion 7c at an ideal position coinciding with the center of the electromechanical connecting portion 7a. However, as shown in FIG. 9B, depending on the lead-out position of the stator winding 5, etc., the position of the stator winding 5 is not regulated, and the position of the stator winding 5 is not regulated, and the center of the electromechanical connection portion 7a Lateral deviation 11 from the contact occurs, resulting in an unstable weld, an unstable electrical connection of the weld, and a decrease in mechanical strength. In addition, since the welded portions are stably connected, the electric resistance of the welded portions at a plurality of locations becomes equal, and deterioration of the electrical characteristics of the rotating electric machine can be suppressed.

Therefore, in the busbar terminal 7 of this embodiment, as shown in FIG. 9C, a flat portion is formed on the surface of the restricting portion 7g facing the stator winding 5. As shown in FIG. Since the stator winding 5 contacts the flat portion of the regulating portion 7g at two or more points (preferably in a continuous line), the position of the stator winding 5 can be regulated more stably. The flat portion may be a flat surface or a curved surface as long as it contacts the stator windings 5 at two or more points.

Also, in the busbar terminal 7 of the present embodiment, as shown in FIG. 9D, a plurality of restricting portions 7h may be formed. Since the stator winding 5 is in contact with each of the plurality of restricting portions 7h (that is, the stator winding 5 and the restricting portion 7h are in contact at two or more points), the position of the stator winding 5 can be further adjusted. Stable and regulated.

In this embodiment, as shown in FIG. 8, the height 7j of the restricting portions 7g and 7h is preferably formed so as to be smaller than the radius 5b of the circular cross section of the stator winding 5. As shown in FIG. As a result, even if the stator winding 5 sandwiched between the first holding portion 7d and the second holding portion 7e is deformed, the second holding portion 7e does not come into contact with the restricting portion, leaving a margin for displacement. Since the second holding portion 7e is deformed, sufficient force for holding the stator winding 5 can be secured.

If the amount of deformation of the stator winding 5 is small even if it is sandwiched between the first holding portion 7d and the second holding portion 7e, the stator winding 5 may move the restricting portions 7g and 7h during the deformation of the second holding portion 7e. There is a risk of getting over it. In such a case, the height 7j of the restricting portions 7g and 7h may be formed to be larger than the radius 5b of the circular cross section of the stator winding 5. FIG.

In the present embodiment, the busbar terminal 7 has a structure in which the restriction portion 7c is provided, and the position of the stator winding 5 can be restricted by forming the stator winding 5 between the bent portion 7b and the restriction portion 7c. Furthermore, by providing a restricting portion 7g having a flat portion or a plurality of restricting portions 7h, positional variations of the stator windings 5 are suppressed, thereby stabilizing electrical connection work such as TIG welding.

As described above, according to the embodiment of the present invention, the busbar terminal 7 includes the first holding portion 7d and the second holding portion 7e that sandwich the stator winding 5 and face each other; The regulation portions 7g and 7h are provided at least partially in the space facing the second holding portion, and the stator winding 5 and the regulation portions 7g and 7h are in contact at two or more points. The position of the wire 5 can be regulated more stably. Therefore, workability during welding can be improved, and connection reliability of the busbar terminal 7 can be improved.

Moreover, since the stator winding 5 and the surface of the restricting portion 7g facing the stator winding 5 are in contact at two or more points (preferably, in a continuous line), the plane of the restricting portion 7g contacts the stator. The extending direction of the windings 5 can be defined.

In addition, the busbar terminal 7 has a plurality of restricting portions 7h, and the stator winding 5 and each of the plurality of restricting portions 7h are in contact with each other. Easy to form.

In addition, the stator winding 5 is formed to have a circular cross section, and the restricting portions 7g and 7h are formed at a height greater than the radius 5b of the circular cross section of the stator winding 5. withdrawal can be reliably regulated.

It should be noted that the present invention is not limited to the embodiments described above, but includes various modifications and equivalent configurations within the scope of the appended claims. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and the present invention is not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment may be replaced with the configuration of another embodiment. Moreover, the configuration of another embodiment may be added to the configuration of one embodiment. Further, additions, deletions, and replacements of other configurations may be made for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1... Stator core 2... Housing 3... Salient pole part 4... Insulator 5... Stator winding 5a... Length of stator winding 5 in thickness direction 5b... Radius of circular cross section 6 Connector portion 7 Busbar terminal 7a Electromechanical connecting portion 7b Bending portion 7c Regulating portion 7d First holding portion 7e Second holding portion 7f Other end of second holding portion 7e Distance from restricting portion 7c, 7g restricting portion having a flat portion, 7h multiple restricting portions, 7j height of restricting portion, 8 terminal block, 9 rightward, 10 crimping direction, 11 center Deviation, 100... Stator part

Claims (5)

a stator winding having connections;
A busbar terminal having a welded portion with the connection portion,
The busbar terminal is
a first holding portion sandwiching the stator winding and facing each other and a second holding portion having an open side ;
a restricting portion protruding from the first holding portion at least partially in a space between the first holding portion and the second holding portion ;
The rotating electrical machine , wherein the stator winding is bent in the facing space and contacts the restricting portion at two or more points. The rotating electric machine according to claim 1,
The restricting portion has a plane facing the stator winding,
A rotary electric machine, wherein the stator winding and a surface of the restricting portion facing the stator winding are in contact at two or more points. The rotating electric machine according to claim 1,
The busbar terminal has a plurality of regulation parts,
A rotary electric machine, wherein the stator winding and each of the plurality of restricting portions are brought into contact with each other so that the restricting portion and the stator winding are in contact at two or more points. The rotating electric machine according to any one of claims 1 to 3,
The rotary electric machine, wherein the restriction portion is formed to have a height that restricts detachment of the stator winding. The rotating electric machine according to claim 4,
The stator winding is formed so that the cross section of the stator winding is circular,
A rotary electric machine, wherein the restricting portion is formed at a height greater than a radius of a circular cross section of the stator winding.