JP2936939B2 - Permanent magnet type rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotating electric machine using a permanent magnet as a field pole.

[0002]

2. Description of the Related Art FIGS.
FIG. 21 is a diagram showing a conventional permanent magnet type rotating electric machine disclosed in Japanese Patent No. 9231, FIG. 21 is a front half view of a stator, FIG. 22 is a development view viewed from line XXII-XXII of FIG. 21, and FIG. 22
FIG. 13 is an enlarged sectional view taken along line XXIII-XXIII of FIG.

[0003] In the drawing, reference numeral 1 denotes an arc-shaped permanent magnet, 2 denotes a yoke (yoke) as a cylindrical fixed frame also serving as an external magnetic circuit. Processed in two rows. Reference numeral 3 denotes a positioning member, which is a steel plate used as a plate-shaped elastic member, and which is pressed so as to have a U-shaped cross section. The positioning member 3 has a through hole 3a formed therein.
The positioning member 3 is attached to the inner surface of the yoke 2 by being fitted to the projection 2a on the inner surface of the yoke 2 via the line a. Reference numerals 3b denote locking pieces provided at both ends in the axial direction of the positioning member 3, and are formed by being opened outward in the circumferential direction to position the permanent magnet 1 in the axial direction. Reference numeral 4 denotes an auxiliary pole formed of a mild steel strip member, which is fixed to the inner surface of the yoke 2 by electric resistance welding. The auxiliary pole 4 is a magnetizing side end of a magnetic flux (armature reaction magnetic flux) generated by a rotor (not shown) rotatably mounted in the inner circumferential space of the permanent magnet 1 (magnetizing side end of the permanent magnet 1). ) And is fixed.

When the positioning member 3 is used, when the permanent magnet 1 is mounted on the inner surface of the yoke 2, since the positioning member 3 is mounted on the inner surface of the yoke 2 in advance, the circumferential direction of the permanent magnet 1 is changed. Positioning can be performed easily and with high accuracy. Further, since both end surfaces in the axial direction of the permanent magnet 1 and the auxiliary pole 4 are in contact with the locking pieces 3b provided at both ends in the axial direction of the positioning member 3, the positioning of the permanent magnet 1 in the axial direction becomes easy. In addition, the positioning accuracy is increased. Furthermore, since the permanent magnet 1 does not shift during operation, the characteristics of the rotating electric machine do not change. When the permanent magnet 1 is mounted on the inner surface of the yoke 2, the mounting operation is facilitated because the elastic force of the positioning member 3 is used. In addition,
The protrusions 2a are formed to have an R portion (curved portion) on one side, respectively, so that the protrusions 2a facilitate the fitting and prevent the positioning member 3 from moving in the axial direction in a pair.

[0005]

In the permanent magnet type rotating electric machine, the through bolts passing through the inside of the yoke are standardized so as to fit between the permanent magnets so that the through bolts do not protrude from the inner peripheral surface of the permanent magnet. . However, in the conventional permanent magnet type rotating electric machine as described above, the projection 2a of the yoke 2 projects on the inner surface of the positioning member 3 as shown in FIG. In order to prevent the through bolt 5 from protruding from the inner peripheral surface of the permanent magnet 1 by changing the bolt pitch of the through bolt 5 or increasing the inner diameter of the yoke 2, it is necessary to increase the size and cost. There was a problem that leads to.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a permanent magnet type which can cope with miniaturization and obtain the mounting strength and accuracy of the positioning member by means of the positioning member mounting means which does not interfere with the through bolts. It is intended to obtain a rotating electric machine.

[0007]

A permanent magnet type rotating electric machine according to the present invention is provided with a projecting portion at a position deviated in a circumferential direction from a mounting center position of a through bolt in an inner peripheral portion of a yoke,
The positioning member for positioning the permanent magnet in the circumferential direction is provided with a locking portion for locking with the protruding portion.

[0008]

In the present invention, since the projecting portion of the yoke and the locking portion of the positioning member for locking the yoke are located at positions deviated in the circumferential direction from the mounting center position of the through bolt, the yoke of the through bolt and the yoke are displaced. It does not interfere with the projecting portion or the engaging portion, and does not cause a change in bolt pitch or an increase in the inner diameter of the yoke.

[0009]

【Example】

Embodiment 1 FIG. One embodiment of the present invention will be described with reference to FIGS. 1 is a development view of a main part, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. The description is omitted by attaching reference numerals. In the figure, reference numeral 6 denotes a positioning member, which is formed by bending a plate-shaped elastic member into a U-shaped cross section and is fitted between the permanent magnets 1 by elastic force to fix the permanent magnet 1 in a circumferential direction. Reference numerals 7 denote four locking pieces provided at both ends in the axial direction of the positioning member 6, which are respectively locked to both end surfaces of the permanent magnet 1 to perform positioning of the permanent magnet 1 in the axial direction. Reference numeral 8 denotes a protruding portion provided in the inner peripheral portion of the yoke 2 at a position deviated in the circumferential direction from the mounting center of the through bolt 5. Are formed as protrusions. Reference numeral 9 denotes a locking portion provided on the positioning member 6, which is formed as a square hole in which the projecting portion 8 of the yoke 2 is locked.

When the projecting portion 8 of the yoke 2 is engaged with the engaging portion 9 of the positioning member 6 as a pair of opposed projections, the projecting portion 8 projecting from the inner surface of the positioning member 6 is shown in FIG. As described above, since the position is shifted in the circumferential direction from the mounting center position of the through bolt 5, the through bolt 5 does not interfere with the projecting portion, and it is necessary to increase the inner diameter of the yoke 2 in order to avoid interference between the two. Absent.

When the protruding portion 8 is formed as a barb as shown in FIG. 2, it can be easily processed by a press and has a bite into the locking portion 9, so that the positioning member 6 is particularly a thin plate. Even by using the shear force, it can be firmly locked.

Embodiment 2 FIG. In the first embodiment, the protrusion 8 has a barb shape.
The protrusions by press working shown in (a) and (b) may be used.

Embodiment 3 FIG. In the first and second embodiments, the locking portion 9 is used.
Has shown a square hole formed in the middle of the positioning member 6, but as shown in FIGS. 5 to 7, each recess 6a of the continuous portion of the four locking pieces 7 can be used as a locking portion. For example, since the outside of the locking portion (the recess 6a) can be regulated by the projection (the protruding portion 8),
The distance between the pair of opposed projections can be increased, and the inner diameter distortion of the yoke 2 between the projections caused by pressing can be suppressed.

Embodiment 4 FIG. In the first and second embodiments, the locking portion 9 is used.
In the third embodiment, each of the recesses 6a of the continuous portion of the four locking pieces 7 is used as a locking portion. However, as shown in FIGS. When the round holes provided in the four locking pieces 7 are used as the locking portions 9 and the round protruding portions 8 of the yoke 2 are formed in this by pressing, the gap between the pair of opposing round protruding portions 8 is formed. Can be made large, so that the inner diameter distortion between the projections due to the press can be suppressed. Also, if the protruding portion 8 is made round as described above,
The accuracy of engagement with the locking portion 9 is improved.

Embodiment 5 FIG. In the first to fourth embodiments, the yoke 2 is used.
The projections 8 are formed on the inner periphery by pressing the outer periphery of the yoke 2. However, as shown in FIGS. 10 to 12, the projections 8 may be formed by driving the studs 10 from the outer periphery of the yoke 2. This eliminates the need for press working and prevents the inner diameter distortion of the yoke 2 from occurring. Note that a hole smaller than the diameter of the stud 10 is provided in the positioning member 6 to form the locking portion 9, and the locking portion 9 can be fitted into the stud 10.

Embodiment 6 FIG. Next, another embodiment of the present invention will be described with reference to FIGS. 13 is a front half view of the stator, FIG. 14 is a developed view taken along line XIV-XIV of FIG. 13, FIG. 15 is a developed view taken along line XV-XV of FIG.
FIG. 14 is an enlarged sectional view taken along line XVI-XVI in FIG. 14, and the same or corresponding parts as in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the figure, reference numeral 11 denotes a projecting portion provided on the positioning member 6, which has a projecting semicircular portion 11a and a straight portion 11b. Reference numeral 12 denotes an engagement portion provided on the inner periphery of the yoke 2.
It has a concave shape having a semicircular portion 12a into which the projecting portion 11 fits and a straight portion 12b.

As described above, when the projecting portion 11 of the positioning member 6 is engaged with the engaging portion 12 of the yoke 2, each semicircular portion 11a,
Since the positioning member 6 is fixed to the yoke 2 in a state where the movement in the axial direction is prevented by the engagement of the engagement portion 12a and the movement in the circumferential direction is prevented by the engagement of the straight portions 11b and 12b,
It does not interfere with the through bolt 5.

Embodiment 7 FIG. In the sixth embodiment, the short straight portion 1
Although two symmetrically arranged protruding portions 11 having engaging portions 1b and 12b and two engaging portions 12 are shown, long protruding portions 11A of linear portions 11b and 12b are provided as shown in FIGS. , 12A. In this case, since the projecting portion 11 is not drawn by half punching as in Embodiment 6 (FIG. 16), but is drawn, the strength of the engaging portion can be obtained.

Embodiment 8 FIG. In the above-described embodiments 6 and 7 (FIGS. 16 and 18), the engagement portion 12 of the yoke 2 is shown as having a concave shape. However, as shown in FIGS. May be engaged. In this case, since the yoke 2 has a round hole, the processing is easy and the accuracy can be improved.

[0020]

As described above, according to the present invention, there is an effect that the mounting means of the positioning member which does not interfere with the through bolts can cope with downsizing and obtain the mounting strength and accuracy of the positioning member.

[Brief description of the drawings]

FIG. 1 is a development view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a cross-sectional view of a main part showing Embodiment 2 of the present invention.

FIG. 5 is a development view of a main part showing a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 5;

FIG. 8 is a development view of a main part showing a fourth embodiment of the present invention.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;

FIG. 10 is a development view of relevant parts showing Embodiment 5 of the present invention.

FIG. 11 is a sectional view taken along line XI-XI in FIG. 10;

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a front half view of a stator showing a sixth embodiment of the present invention.

FIG. 14 is a developed view taken along line XIV-XIV in FIG.

FIG. 15 is a developed view as viewed from line XV-XV in FIG. 13;

FIG. 16 is an enlarged sectional view taken along line XVI-XVI in FIG. 14;

FIG. 17 is a development view of relevant parts showing Embodiment 7 of the present invention.

18 is a sectional view taken along line XVIII-XVIII in FIG.

FIG. 19 is a development view of a main part showing Embodiment 8 of the present invention.

FIG. 20 is a sectional view taken along line XX-XX in FIG. 19;

FIG. 21 is a front half view of a conventional stator.

FIG. 22 is a developed view as viewed from line XXII-XXII in FIG. 21.

FIG. 23 is an enlarged sectional view taken along line XXIII-XXIII in FIG. 22;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Permanent magnet 2 Yoke 5 Through bolt 6 Positioning member 7 Locking piece 8, 11 Projection 9 Locking part 12 Engaging part

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H02K 1/17 H02K 1/27 502 H02K 23/04

Claims (2)

(57) [Claims] 1. A permanent magnet type rotating electric machine in which a through bolt passes through an inside of a yoke in an axial direction, wherein a cylindrical fixed frame also serving as the yoke is arranged on the inner surface of the cylindrical fixed frame at intervals in a circumferential direction. A plurality of permanent magnets, which are arranged at the interval of the plurality of permanent magnets, apply a circumferential force to adjacent permanent magnets, and the adjacent permanent magnets are radially outward on the inner surface of the cylindrical fixed frame. A positioning member adapted to be pressed, fixing means provided on the positioning member and the cylindrical fixing frame for fixing the positioning member circumferentially and axially to the cylindrical fixing frame,
And two pairs of locking pieces provided on the positioning member to prevent the permanent magnet from moving in the axial direction, wherein the positioning member is substantially U-shaped at a portion located between the permanent magnets, and has a U-shape. The fixing means for fixing the positioning member circumferentially and axially to the cylindrical fixed frame is disposed so that a portion connecting both legs of the cylindrical fixed frame is in contact with the cylindrical fixed frame. Four protruding portions provided so as to protrude radially inward at intervals in the axial direction and at intervals in the circumferential direction,
A locking portion provided on the positioning member to receive the protruding portion and engaging with a side surface of the protruding portion. The through bolt is a portion of the U-shaped portion connecting the two legs of the positioning member. A permanent-magnet-type electric rotating machine characterized by passing axially between the projecting portions that are in contact with the inner surface and are spaced apart in the circumferential direction. 2. A permanent magnet type rotating electric machine in which a through-bolt passes through the inside of a yoke in the axial direction, wherein a cylindrical fixed frame also serving as the yoke is arranged on the inner surface of the cylindrical fixed frame at intervals in the circumferential direction. A plurality of permanent magnets, which are arranged at the interval of the plurality of permanent magnets, apply a circumferential force to adjacent permanent magnets, and the adjacent permanent magnets are radially outward on the inner surface of the cylindrical fixed frame. A positioning member adapted to be pressed, fixing means provided on the positioning member and the cylindrical fixing frame for fixing the positioning member circumferentially and axially to the cylindrical fixing frame,
And two pairs of locking pieces provided on the positioning member to prevent the permanent magnet from moving in the axial direction, wherein the positioning member is substantially U-shaped at a portion located between the permanent magnets, and has a U-shape. The fixing means for fixing the positioning member in the circumferential direction and the axial direction with respect to the cylindrical fixing frame is disposed so that a portion connecting both legs thereof is in contact with the cylindrical fixing frame. A projecting portion provided so as to protrude outward in the direction, and a locking portion provided on the cylindrical fixed frame to receive the projecting portion and engaging with a side surface of the projecting portion, The permanent magnet type rotary electric machine according to claim 1, wherein the through bolt is in contact with an inner surface of a portion connecting the two legs of the U-shaped positioning member and passes in an axial direction.