JP2019140757A - Rotary electric machine, method for manufacturing the same, and blower - Google Patents

Abstract

To provide a rotary electric machine capable of improving cooling performance of the same while securing characteristics of the same, a manufacturing method of the same, and a blower.SOLUTION: A back yoke 20 is formed of: a first back yoke section 24 that is separated from an inner wall 41 of a frame 4 and forms a space part 8 in an outer side X1 in a radial direction X of teeth 26, and is formed into a convex shape in an inner side X2 in the radial direction X; and a second back yoke section 25 in contact with the inner wall 41 of the frame 4 at both ends in a circumferential direction Z of the first back yoke section 24. A length L1 in the circumferential direction Z of the first back yoke section 24, a length L2 in the circumferential direction Z of the teeth 26, a length L4 from a center line Q in the circumferential direction Z of the teeth 26 in the circumferential direction Z of the first back yoke section 24 to the second back yoke section 24, and a length T3 of the teeth 26 in the radial direction X are formed with L1≥L2×2 and L4>T3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine that can improve the cooling performance of the rotating electrical machine while ensuring the characteristics of the rotating electrical machine, a method for manufacturing the rotating electrical machine, and a blower.

  In the conventional rotating electric machine and blower, the iron core constituting the stator has a shape that protrudes toward the inner diameter side and a space portion on the outer diameter side. As a conventional cooling method for a rotating electrical machine, a technique of flowing air or liquid into the convex space is known (for example, Patent Document 1, Patent Document 2, and Patent Document 3).

JP2013-42588A JP2016-39656 JP2012-186880

  Conventional rotating electrical machines and blowers are configured to cool the stator and the rotating electrical machine by providing grooves on the outer diameter side of the stator or convex shapes on the inner diameter side. Or, if the core of the stator has a convex shape on the inner diameter side, the magnetic flux in the back yoke cannot be used effectively, and the characteristics of the rotating electrical machine deteriorate, and the loss increases due to the long magnetic path. There is a problem that the cooling area of the stator core is small and the cooling performance of the rotating electric machine is low.

  The present invention has been made to solve the above-described problems, and provides a rotating electrical machine, a method for manufacturing the rotating electrical machine, and a blower that can improve the cooling performance of the rotating electrical machine while ensuring the characteristics of the rotating electrical machine. For the purpose.

The rotating electrical machine of the present invention is
In a rotating electrical machine comprising a stator installed inside a cylindrical frame, and a rotor having a rotating shaft installed inside the stator in the radial direction,
The stator includes an annularly formed back yoke, an iron core having a plurality of teeth that are spaced apart from the back yoke in the circumferential direction and project inward in the radial direction, and a winding around each of the teeth. And a coil housed in a slot portion surrounded by the teeth and the back yoke,
The back yoke includes a first back yoke portion that forms a space apart from the inner wall of the frame on the outer side in the radial direction of the teeth and is formed in a convex shape on the inner side in the radial direction, and the first back yoke A second back yoke portion in contact with the inner wall of the frame at both ends in the circumferential direction of the yoke portion;
The circumferential length of the first back yoke portion is L1,
The circumferential length of the teeth is L2,
The length from the circumferential center line of the teeth of the first back yoke portion to one of the second back yoke portions is L4,
If the length of the teeth in the radial direction is T3,
L1 ≧ L2 × 2 and L4> T3.
The blower of the present invention includes the rotating electric machine,
And a wing portion installed on the rotating shaft of the rotating electrical machine.
In addition, the manufacturing method of the rotating electrical machine of the present invention,
A third side surface on the outer side in the radial direction of the first back yoke portion is used for positioning, and a coil is wound around the teeth to form the coil.

According to the rotating electrical machine of the present invention, the method of manufacturing the rotating electrical machine, and the blower,
The cooling performance of the rotating electrical machine can be improved while ensuring the characteristics of the rotating electrical machine.

It is a top view which shows the structure of the rotary electric machine of Embodiment 1 of this invention. It is a top view which shows the structure of the split iron core of the stator of the rotary electric machine shown in FIG. It is a top view which shows the structure of the split iron core of the stator of the rotary electric machine shown in FIG. It is a top view which shows the manufacturing method of the rotary electric machine shown in FIG. It is a top view which shows the manufacturing method of the rotary electric machine shown in FIG. It is a top view which shows the manufacturing method of the rotary electric machine shown in FIG. It is a fragmentary sectional view which shows the manufacturing method of the rotary electric machine shown in FIG. It is sectional drawing which shows the manufacturing method of the rotary electric machine shown in FIG. It is sectional drawing which shows the structure of the air blower using the rotary electric machine shown in FIG. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 2 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 2 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 3 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 3 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 4 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 4 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 5 of this invention. It is a top view which shows the structure of the split iron core of the rotary electric machine of Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a top view showing a configuration of a rotating electrical machine according to Embodiment 1 of the present invention. 2 and 3 are top views showing one split core of the stator core of the rotating electric machine shown in FIG. FIG. 2 is a view for explaining the length of each part of the split iron core. FIG. 3 is a view for explaining the position of each part of the split iron core.

  4 to 8 are diagrams showing a method of manufacturing the rotating electrical machine shown in FIG. FIG. 4 is a top view showing a state in which a coil is formed on the divided iron core. FIG. 5 is a top view showing a state in which the stator core is formed by arranging the split iron cores shown in FIG. 4 in an annular shape. FIG. 6 is a top view showing a state in which the stator shown in FIG. 5 is installed in the frame. FIG. 7 is a partial cross-sectional view showing a state before a bearing is installed on the rotating shaft of the rotor and the rotor is inserted into the frame. FIG. 8 is a cross-sectional view showing a state where a rotor and a bearing are installed in a frame to constitute a rotating electrical machine. FIG. 9 is a cross-sectional view showing the structure of a blower in which blades are installed on a rotating shaft protruding out of the frame of the rotating electrical machine shown in FIG.

  In the first embodiment, a permanent magnet type rotating electrical machine 1 having 4 poles and 4 slots will be described. However, the number of poles and the number of slots of the rotating electrical machine 1 can be appropriately increased or decreased. Moreover, in the following description, each direction in the rotary electric machine 1 is shown as the circumferential direction Z, the axial direction Y, the radial direction X, the outer side X1 of the radial direction X, and the inner side X2 of the radial direction X, respectively. Therefore, also in other parts, each direction is shown and demonstrated on the basis of these directions. The same applies to other embodiments.

  In the figure, the rotating electrical machine 1 includes a frame 4, a stator 2, and a rotor 3. The rotating electrical machine 1 is arranged in the order of the frame 4, the stator 2, and the rotor 3 from the outer side X <b> 1 in the radial direction X. The frame 4 is formed in a cylindrical shape, here a cylindrical shape. The stator 2 is fixedly installed on the frame 4. In the present embodiment, the iron core 21 and the frame 4 of the stator 2 are fixed by shrink fitting. However, the fixing of the iron core 21 and the frame 4 is not limited to shrink fitting, but may be fixed with an adhesive or by welding. Moreover, the linear expansion coefficients of the iron core 21 and the frame 4 may be the same or different.

  The rotor 3 has a rotation shaft 6. The stator 2 and the rotor 3 are formed concentrically. Between the radial direction X of the stator 2 and the rotor 3, an air gap 5 that is a gap is formed. As shown in FIG. 1, the air gap 5 is formed with a width W1 in the radial direction X of 0.1 mm to 2.5 mm.

  The rotor 3 includes a permanent magnet 7 fixed to the rotary shaft 6 at the axial center position. The permanent magnet 7 is fixed to the rotary shaft 6 by integral molding or adhesive. The fixing method is not limited to this. End caps 71 are installed at both ends of the permanent magnet 7 in the axial direction Y.

  The stator 2 has an iron core 21, a coil 22, and an insulator 23. The iron core 21 is formed by laminating electromagnetic steel plates, which are a plurality of thin plates configured in an annular shape, in the axial direction Y. Any member can be used as the member used for the iron core 21 as long as the member passes the magnetic flux.

  The iron core 21 has a ring-shaped back yoke 20 and a plurality of teeth 26 that are spaced from the back yoke 20 in the circumferential direction Z and project inward in the radial direction X2. The iron core 21 is formed by a divided iron core 211 obtained by dividing the back yoke 20 between the teeth 26 adjacent in the circumferential direction Z. Here, since the teeth 26 are formed at four places, the core 21 is formed by four divided cores 211.

  The coil 22 is wound around each tooth 26 via an insulator 23 and is housed and installed in a slot portion 9 surrounded by the tooth 26 and the back yoke 20. The insulator 23 is disposed between the iron core 21 and the coil 22 and plays a role of insulation. Any material can be used as long as it can be insulated. For example, resin, resin sheet, tape, paper, etc. Used.

  The coil 22 may be wound in any manner as long as it is disposed in the slot portion 9. The coil 22 may be made of any material as long as it can conduct electricity, and copper is used in the present embodiment. The back yoke 20 is formed by the first back yoke portion 25 and the second back yoke portion 24. The first back yoke portion 25 is formed in a convex shape on the inner side X <b> 2 in the radial direction X while forming the space portion 8 apart from the inner wall 41 of the frame 4 on the outer side X <b> 1 in the radial direction X of the tooth 26. The space 8 is used as a flow path through which the cooling body passes in the axial direction Y of the iron core 21. Therefore, the iron core 21 is cooled when the cooling body passes through the space 8. Any cooling body may be used as long as it can cool the iron core 21, and liquid or gas is used.

  The second back yoke portion 24 is formed at both ends in the circumferential direction Z of the first back yoke portion 25 and is formed in contact with the inner wall 41 of the frame 4. That is, the second back yoke portion 24 is a portion fixed to the inner wall 41 of the frame 4.

  As shown in FIG. 2, the length in the circumferential direction Z of the first back yoke portion 25 is L1. The length of the tooth 26 in the circumferential direction Z is L2. Further, the length from the center line Q in the circumferential direction Z of the teeth 26 of the first back yoke portion 25 to one second back yoke portion 24 in the circumferential direction Z is set to L4 (hereinafter, the circumferential direction of the first back yoke portion 25). Z is referred to as one length L4). Moreover, let the length of the radial direction X of the teeth 26 be T3. Then, the split iron core 211, that is, the iron core 21 is formed so that these relationships satisfy L1 ≧ L2 × 2 and L4> T3.

  However, the length T3 of the teeth 26 in the radial direction X is set to a length that allows at least one winding for forming the coil 22 to be installed in order to install the coil 22. In addition, when the winding is a square wire, the length T3 is set to a length at which the length of one side on the short side of the square wire can be installed.

  A side surface in the axial direction Y of the outer side X1 of the first back yoke portion 25 in the radial direction X is referred to as a third side surface 252, and a side surface in the axial direction Y of the inner side X2 in the radial direction X is referred to as a fourth side surface 251. Further, the side surface in the axial direction Y of the outer side X1 in the radial direction X of the second back yoke portion 24 is referred to as a first side surface 242, and the side surface in the axial direction Y of the inner side X2 in the radial direction X is referred to as second side surface 241. The first side surface 242 and the second side surface 241 of the second back yoke portion 24 and the inner wall 41 of the frame 4 are formed in a concentric circular arc shape. As a result, a large interference between the frame 4 and the iron core 21 can be secured.

  Further, when the width between the first side surface 242 and the second side surface 241 of the second back yoke portion 24 is T1, and the width between the third side surface 252 and the fourth side surface 251 of the first back yoke portion 25 is T2. , T1 = T2. Further, the length L2 of the teeth 26 in the circumferential direction Z is formed so as to be 1.5 times or more, particularly 2 times or more of T1 and T2. In the tooth 26, the side surface in the axial direction Y of the inner side X <b> 2 in the radial direction X is defined as a tip surface 262, and the side surfaces in the axial direction Y at both ends in the circumferential direction Z are defined as fifth side surfaces 261. Further, the fourth side surface 251 and the third side surface 252 of the first back yoke portion 25 are each formed in a planar shape.

  As shown in FIG. 3, the cross-section is perpendicular to the axial direction Y of the split iron core 211, and on the outer line of the inner side X <b> 2 in the radial direction X of the split iron core 211, the intersection of the tooth 26 and the first back yoke portion 25, That is, the intersection point between the fifth side surface 261 of the tooth 26 and the fourth side surface 251 of the first back yoke portion 25 is P1, and the intersection point between the first back yoke portion 25 and the second back yoke portion 24, ie, the first The intersection of the fourth side surface 251 of the back yoke part 25 and the second side surface 241 of the second back yoke part 24 is P2, and the end of the inner side X2 of the second back yoke part 24 in the circumferential direction Z, that is, the iron core 21 An intermediate point in the circumferential direction Z between the teeth 26 adjacent to the circumferential direction Z in the second back yoke portion 24 is defined as P3. The positional relationship between P1, P2, and P3 is formed in the order of P3, P1, and P2 from the inner side X2 in the radial direction X.

  The bearing portion 91 is formed at a location different from the rotor 3 of the rotating shaft 6. A bearing frame 40 for installing the bearing portion 91 is formed in communication with the upper side of the frame 4 in the axial direction Y.

  And the air blower 100 as shown in FIG. 9 is comprised using the rotary electric machine 1 comprised as mentioned above. In FIG. 9, the blower 100 is provided with a wing portion 92 as a load portion at a location different from the rotor 3 of the rotating shaft 6. The blower 100 only needs to be able to move air by the rotation of the wing 92, and for example, a vacuum cleaner or the like can be considered.

  Next, a method for manufacturing the rotary electric machine 1 and the blower 100 according to Embodiment 1 configured as described above will be described. First, the insulator 23 is installed on the split iron core 211 shown in FIG. Next, the coil 22 is formed on the tooth 26 via the insulator 23 (FIG. 4). At this time, the coil 22 is formed by winding the winding while holding the first back yoke portion 25 formed in a convex shape on the inner side X <b> 2 in the radial direction X as the positioning of the divided iron core 211. Any winding method can be used. For example, spindle winding or flyer winding is used.

  Next, as shown in FIG. 4, four divided iron cores 211 provided with the coils 22 are prepared and installed in a ring shape to form the iron core 21. Therefore, the back yoke 20 formed in an annular shape is formed (FIG. 5). Next, the 2nd back yoke part 24 is arrange | positioned in contact with the inner wall 41 of the flame | frame 4, and the stator 2 is fixed in the flame | frame 4 (FIG. 6). Next, the permanent magnet 7 is integrally molded or fixed to the rotating shaft 6. Next, the end cap 71 is installed on the permanent magnet 7. Next, a bearing portion 91 composed of, for example, a bearing, a wave washer, a spacer, a rubber washer, a bearing or the like is inserted from the side where the permanent magnet 7 is not disposed on the rotating shaft 6.

  Next, the rotating shaft 6 is inserted in the direction of arrow A shown in FIG. Here, the bearing portion 91 is inserted into the bearing frame 40. Moreover, the rotor 3 is installed so as to have an air gap 5 on the inner side X2 in the radial direction X of the stator 2, and the rotating electrical machine 1 is manufactured (FIG. 8). Next, the wing 92 is installed on the rotating shaft 6 protruding in the axial direction Y from the bearing frame 40, and the blower 100 is manufactured (FIG. 9).

  Next, the rotating electrical machine of the first embodiment configured as described above, the manufacturing method of the rotating electrical machine, and the effect of the blower will be described. Since the relationship between the length L1 in the circumferential direction Z of the third side surface 252 of the first back yoke portion 25 and the length L2 in the circumferential direction Z of the teeth 26 is configured to satisfy L1 ≧ L2 × 2, Since the space 8 can be provided larger, the rotating electrical machine 1 and the blower 100 can be reduced in weight, and a large passage for allowing the cooling body to pass through can be secured, so that the cooling performance of the rotating electrical machine 1 and the blower 100 can be improved. Furthermore, since one length L4 in the circumferential direction Z of the first back yoke portion 25 is formed larger than the length T3 in the radial direction X of the teeth 26, the length of the magnetic path can be shortened, and loss (iron loss) ) Can be reduced.

  Further, since the inner wall 41, the second side surface 241 and the first side surface 242 of the frame 4 are formed in a concentric circular arc shape, it is possible to secure a large interference and play a role of preventing the stator 2 from coming off from the frame 4. Furthermore, the mold shape of the iron core 21 can be simplified. Also, assembly is facilitated. Furthermore, the magnetic path can be prevented from being short-circuited, and the magnetic flux can be effectively utilized.

  Moreover, since the 4th side 251 and the 3rd side 252 of the 1st back yoke part 25 are each comprised by planar shape, the metal mold | die shape of the iron core 21 can be simplified.

  The relationship between the width T1 between the second side surface 241 and the first side surface 242 of the second back yoke portion 24 and the width T2 between the fourth side surface 251 and the third side surface 252 of the first back yoke portion 25 is as follows. Since it is configured by the relationship of T1 = T2, a short circuit of the magnetic path can be prevented, the magnetic flux can be effectively used, and loss can be reduced.

  Moreover, since the 1st back yoke part 25 can be used for the positioning at the time of winding of a coil | winding, position shift of the iron core 21 can be prevented and winding disorder of the coil 22 can be suppressed. For this reason, the alignment time of the coil 22 and the positioning time of the iron core 21 of the stator 2 can be shortened.

  Further, the cross-section is perpendicular to the axial direction Y of the iron core 21, and the intersection point P <b> 1 between the tooth 26 and the first back yoke portion 25 on the inner line X <b> 2 in the radial direction X of the iron core 21, and the first back yoke portion 25 and the intermediate point P3 in the circumferential direction Z between the teeth 26 adjacent to the circumferential direction Z of the second back yoke portion 24 are P3 from the inner side X2 in the radial direction X, Since it is formed by the arrangement of P1 and P2, it is possible to secure a larger area of the slot portion 9 in which the coil 22 is installed while preventing a short circuit of the magnetic path, and to easily wind the winding. Moreover, since the magnetic path can be shortened, loss can be reduced. Since the relationship between the length T3 in the radial direction X of the tooth 26 and the length L4 of the first back yoke portion 25, L4> T3, the magnetic path is shortened as a whole, loss can be reduced, and direct cooling can be performed. A large area of the first back yoke portion 25 of the iron core 21 can be secured, and the cooling performance is improved.

  In the first embodiment, an example in which the iron core of the stator is formed by the split iron core has been shown. However, the present invention is not limited to this, and for example, the stator iron core is formed by one connecting iron core to which the back yoke is connected. The same can be done for the case. Moreover, although the example in which the iron core of the stator is formed by laminating a plurality of thin plates in the axial direction has been shown, the present invention is not limited to this, and it may be formed by a thick member in the axial direction. . Moreover, since these can be applied as appropriate in the following embodiments, the description thereof is omitted.

Embodiment 2. FIG.
The second embodiment shows a case where the shape of the first back yoke portion 25 of the first embodiment is changed, and the description will focus on the points of change from the first embodiment. 10 and 11 are top views showing one split core of the stator core of the rotating electrical machine according to the second embodiment. FIG. 10 is a diagram showing the length of each part of the split iron core. FIG. 11 is a diagram showing the position of each part of the split iron core.

  In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. The fourth side surface 251 and the third side surface 252 of the first back yoke portion 25 are configured by concentric circular arc shapes. Therefore, the winding is performed while holding the third side surface 252 when winding the winding. At this time, the winding is wound by using the first back yoke portion 25 that is convex toward the inner side X2 in the radial direction X for positioning.

  The rotating electrical machine, the manufacturing method of the rotating electrical machine, and the blower configured as described above according to the second embodiment have the same effects as those of the first embodiment, and the first back yoke portion 25 has an inner diameter. Since the fourth side surface 251 and the third side surface 252 are formed in a concentric circular arc shape, magnetic flux leakage can be prevented and loss can be reduced.

Embodiment 3 FIG.
The third embodiment shows a case where the shape of the first back yoke portion 25 of each of the above embodiments is changed, and will be described focusing on the points of change from the above embodiments. 12 and 13 are top views showing one split iron core of the stator iron core of the rotating electric machine according to the third embodiment. FIG. 12 is a diagram showing the length of each part of the split iron core. FIG. 13 is a diagram showing the position of each part of the split iron core.

  In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. On the third side surface 252 of the outer side X1 in the radial direction X of the first back yoke portion 25, a protruding portion 27 that protrudes to the outer side X1 in the radial direction X is formed. Further, a caulking portion 270 that is caulked in the axial direction Y is formed on the protruding portion 27. Thereby, in the iron core 21 formed by laminating a plurality of thin plates in the axial direction Y, the axial direction Y is fixed by the caulking portion 270.

  The rotating electrical machine, the manufacturing method of the rotating electrical machine, and the blower configured as described above according to the third embodiment have the same effects as those of the above-described embodiments, as well as the first back yoke portion 25. Since the protrusions 27 are provided on the three side surfaces 251, and the crimping part 270 that is crimped in the axial direction Y is formed on the protrusion 27, the characteristics of the rotating electrical machine and the blower are obtained without the crimping part 270 interfering with the magnetic path. To prevent loss reduction.

Embodiment 4 FIG.
The fourth embodiment shows a case where the shape of the tooth 26 of each of the above embodiments is changed, and the description will focus on the points of change from the above respective embodiments. 14 and 15 are top views showing one split core of the stator core of the rotating electric machine according to the fourth embodiment. FIG. 14 is a diagram showing the length of each part of the split iron core. FIG. 15 is a diagram showing the position of each part of the split iron core.

  In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. The tip end surface 262 of the tooth 26 is formed in an arc shape concentric with the second side surface 241 and the first side surface 242.

  The rotating electrical machine, the manufacturing method of the rotating electrical machine, and the blower configured as described above according to the fourth embodiment have the same effects as the above-described embodiments, and the tip surface 262 of the tooth 26 is Since the second side surface 241 and the first side surface 242 of the second back yoke portion 24 are formed in a concentric circular arc shape, the tip surface 262 and the first side surface 242 Makes it easier for the iron core 21 and the frame 4 to be coaxial. Moreover, the front end surface 262 and the second side surface 241 can shorten the length of the magnetic path, reduce the loss, and further reduce the weight.

Embodiment 5. FIG.
The fifth embodiment shows a case where the shape of the tooth 26 of each of the above embodiments is changed, and the description will focus on the points of change from the above respective embodiments. 16 and 17 are top views showing one divided core of the stator core of the rotating electric machine according to the fifth embodiment. FIG. 16 is a diagram showing the length of each part of the split iron core. FIG. 17 is a diagram showing the position of each part of the split iron core.

  In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. The tip surface 262 of the tooth 26 includes a second side surface 241 and a portion 264 formed in an arc shape concentric with the first side surface 242 and a portion 265 formed in a planar shape.

  The rotating electric machine, the manufacturing method of the rotating electric machine, and the blower configured as described above according to the fifth embodiment have the same effects as those of the above-described embodiments, and the tip surface 262 of the tooth 26 has The first side surface 242 and the second side surface 241 are provided with a portion 264 formed in a concentric circular arc shape and a portion 265 formed in a planar shape, so that the arc-shaped portion 264 includes three circles. Are configured in concentric circles, the tip surface 262 and the first side surface 242 can be easily coaxial with the iron core 21 and the frame 4. Further, since the tip end surface 262 of the tooth 26 is formed by the arc-shaped portion 264 and the planar portion 265, the cogging torque can be reduced.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 rotating electrical machine, 2 stator, 3 rotor, 4 frame, 5 air gap,
6 Rotating shaft, 7 Permanent magnet, 8 Space part, 9 Slot part, 20 Back yoke,
21 iron core, 22 coil, 23 insulator, 24 second back yoke part,
25 1st back yoke part, 26 teeth, 27 protrusion part, 40 bearing frame,
41 inner wall, 71 end cap, 91 bearing, 92 wings, 100 blower,
211 split iron core, 241 second side, 242 first side, 251 third side,
252 4th side, 261 5th side, 262 tip side, 270 caulking part,
Q center line, X radial direction, X1 outside, X2 inside, Y axis direction, Z circumferential direction,
L1 length, L2 length, L4 length, T1 width, T2 width, T3 length, W1 width.

Claims (12)

In a rotating electrical machine comprising a stator installed inside a cylindrical frame, and a rotor having a rotating shaft installed inside the stator in the radial direction,
The stator includes an annularly formed back yoke, an iron core having a plurality of teeth that are spaced apart from the back yoke in the circumferential direction and project inward in the radial direction, and a winding around each of the teeth. And a coil housed in a slot portion surrounded by the teeth and the back yoke,
The back yoke includes a first back yoke portion that forms a space apart from the inner wall of the frame on the outer side in the radial direction of the teeth and is formed in a convex shape on the inner side in the radial direction, and the first back yoke A second back yoke portion in contact with the inner wall of the frame at both ends in the circumferential direction of the yoke portion;
The circumferential length of the first back yoke portion is L1,
The circumferential length of the teeth is L2,
The length from the circumferential center line of the teeth of the first back yoke portion to one of the second back yoke portions is L4,
If the length of the teeth in the radial direction is T3,
A rotating electrical machine formed by L1 ≧ L2 × 2 and L4> T3. The frame is formed in a cylindrical shape,
The rotating electrical machine according to claim 1, wherein an inner wall of the frame, a first outer side surface in the radial direction of the second back yoke portion, and a second inner side surface in the radial direction are formed in a concentric circular arc shape. The front end surface in the radial direction of the teeth is
The rotating electrical machine according to claim 2, wherein the electric rotating machine is formed in an arc shape concentric with the first side surface and the second side surface. The front end surface in the radial direction of the teeth is
The rotating electrical machine according to claim 2, comprising a portion formed in an arc shape concentric with the first side surface and the second side surface, and a portion formed in a planar shape. The rotation according to any one of claims 1 to 4, wherein a third outer side surface in the radial direction and a fourth inner side surface in the radial direction of the first back yoke portion are formed in a concentric circular arc shape. Electric. 5. The rotating electrical machine according to claim 1, wherein a third outer side surface in the radial direction and a fourth inner side surface in the radial direction of the first back yoke portion are formed in a planar shape. The width between the first outer side surface in the radial direction and the second inner side surface in the radial direction of the second back yoke portion is T1,
When the width between the third outer side surface in the radial direction and the fourth inner side surface in the radial direction of the first back yoke portion is T2,
The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed at T1 = T2. The cross section is perpendicular to the axial direction of the iron core, and on the outer contour line in the radial direction of the iron core,
Let P1 be the intersection of the teeth and the back yoke,
The intersection of the first back yoke part and the second back yoke part is P2,
When the intermediate point in the circumferential direction between the teeth adjacent in the circumferential direction of the second back yoke portion is P3,
The rotating electrical machine according to any one of claims 1 to 7, wherein the positional relationship between P1, P2, and P3 is formed in the order of P3, P1, and P2 from the inside in the radial direction. In the rotating electrical machine in which the iron core of the stator is formed by laminating a plurality of thin plates in the axial direction,
On the third side surface on the outer side in the radial direction of the first back yoke part, provided with a protrusion that protrudes outward in the radial direction,
The rotating electrical machine according to any one of claims 1 to 8, wherein a caulking portion that is caulked in an axial direction is formed on the protruding portion. 10. The rotating electrical machine according to claim 1, wherein the iron core of the stator is formed of a plurality of divided iron cores divided in a circumferential direction between the circumferential directions of the teeth. The rotating electrical machine according to any one of claims 1 to 10,
A blower comprising a wing portion installed on the rotating shaft of the rotating electrical machine. In the manufacturing method of the rotary electric machine according to any one of claims 1 to 11,
A method of manufacturing a rotating electrical machine in which the third outer side surface of the first back yoke portion on the outer side in the radial direction is held for positioning, and the coil is formed by winding a winding around the teeth.

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