JP7085853B2 - Rotating electric machine, manufacturing method of rotating electric machine, and blower - Google Patents

Description

The present invention relates to a rotary electric machine capable of improving the cooling performance of the rotary electric machine while ensuring the characteristics of the rotary electric machine, a method for manufacturing the rotary electric machine, and a blower.

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

JP 2013-42588 JP 2016-39656 JP 2012-186880

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

The present invention has been made to solve the above-mentioned problems, and provides a rotary electric machine, a method for manufacturing the rotary electric machine, and a blower capable of improving the cooling performance of the rotary electric machine while ensuring the characteristics of the rotary electric machine. The purpose is.

The rotary electric machine of the present invention
In a rotary electric machine having a stator installed inside a tubular frame and a rotor having a rotating shaft installed inside the stator in the radial direction.
The stator has a back yoke formed in an annular shape, an iron core having a plurality of teeth formed so as to be spaced apart from the back yoke in the circumferential direction and projecting inward in the radial direction, and winding around each of the teeth. It has a coil that is wound around the tooth and is housed in a slot portion surrounded by the tooth and the back yoke.
The back yoke has a first back yoke portion that forms a space portion on the radial outside of the tooth and is separated from the inner wall of the frame and is formed convexly on the inner side in the radial direction, and the first back. It is formed by 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.
Let L1 be the length of the first back yoke portion in the circumferential direction.
Let L2 be the length of the teeth in the circumferential direction.
The length from the center line of the first back yoke portion in the circumferential direction to one of the second back yoke portions is L4.
Assuming that the radial length of the tooth is T3,
It is formed by L1 ≧ L2 × 2 and L4> T3.
The radial outer third side surface and the radial inner fourth side surface of the first back yoke portion are formed in a concentric arc shape that is convex toward the inner side in the radial direction .
Further, the blower of the present invention includes the rotary electric machine and the above-mentioned rotary electric machine.
It is provided with a vane portion installed on the rotating shaft of the rotating electric machine.
Further, the method for manufacturing a rotary electric machine of the present invention is as follows.
The radial outer third side surface of the first back yoke portion is used for positioning and held, and a winding is wound around the tooth to form the coil.
Further, the method for manufacturing a rotary electric machine of the present invention is as follows.
A rotary electric machine including a stator installed inside a tubular frame and a rotor having a rotating shaft installed inside the stator in the radial direction.
The stator has a back yoke formed in an annular shape, an iron core having a plurality of teeth formed so as to be spaced apart from the back yoke in the circumferential direction and projecting inward in the radial direction, and winding around each of the teeth. It has a coil that is wound around the tooth and is housed in a slot portion surrounded by the tooth and the back yoke.
The back yoke has a first back yoke portion that forms a space portion on the radial outside of the tooth and is separated from the inner wall of the frame and is formed convexly on the inner side in the radial direction, and the first back. It is formed by 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.
Let L1 be the length of the first back yoke portion in the circumferential direction.
Let L2 be the length of the teeth in the circumferential direction.
The length from the center line of the first back yoke portion in the circumferential direction to one of the second back yoke portions is L4.
Assuming that the radial length of the tooth is T3,
In the manufacturing method of the rotary electric machine formed by L1 ≧ L2 × 2 and L4> T3,
The radial outer third side surface of the first back yoke portion is used for positioning and held, and a winding is wound around the tooth to form the coil.

According to the rotary electric machine of the present invention, the manufacturing method of the rotary electric machine, and the blower.
It is possible to improve the cooling performance of the rotary electric machine while ensuring the characteristics of the rotary electric 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 partial cross-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 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.
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a top view showing the configuration of a rotary electric machine according to the first embodiment of the present invention. 2 and 3 are top views showing one split core of the stator core of the rotary electric machine shown in FIG. 1. FIG. 2 is a diagram for explaining the length of each portion of the divided iron core. FIG. 3 is a diagram for explaining the position of each portion of the divided iron core.

4 to 8 are views showing a manufacturing method of the rotary electric machine shown in FIG. 1. 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 split iron core shown in FIG. 4 is arranged in an annular shape to form a stator. 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 in which 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 in which a rotor and bearings are installed in the frame to form a rotary electric machine. FIG. 9 is a cross-sectional view showing the configuration of a blower by installing vanes on a rotary shaft protruding from the frame of the rotary electric machine shown in FIG.

In the first embodiment, a permanent magnet type rotary electric machine 1 having 4 poles and 4 slots will be described. However, the number of poles and the number of slots of the rotary electric machine 1 can be increased or decreased as appropriate. Further, in the following description, each direction in the rotary electric machine 1 is shown as a circumferential direction Z, an axial direction Y, a radial direction X, an outer X1 in the radial direction X, and an inner X2 in the radial direction X, respectively. Therefore, in other parts as well, each direction will be described with reference to these directions. Further, the same description will be given to other embodiments.

In the figure, the rotary electric machine 1 includes a frame 4, a stator 2, and a rotor 3. The rotary electric machine 1 is arranged in the order of the frame 4, the stator 2, and the rotor 3 from the outer side X1 in the radial direction X. The frame 4 is formed in a cylindrical shape, in this case, a cylindrical shape. The stator 2 is fixedly installed on the frame 4. In the present embodiment, the iron core 21 of the stator 2 and the frame 4 are fixed by shrink fitting. However, the fixing of the iron core 21 and the frame 4 is not limited to shrink fitting, but fixing with an adhesive, fixing by welding, or the like is also possible. Further, the coefficient of linear expansion 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. An air gap 5 which is a gap is formed between the stator 2 and the rotor 3 in the radial direction X. 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 rotating shaft 6 at the axial center position. The permanent magnet 7 is integrally molded with the rotating shaft 6 or fixed with an adhesive or the like. 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 a plurality of thin electromagnetic steel sheets formed in an annular shape in the axial direction Y. Any member used for the iron core 21 can be applied as long as it is a member that allows magnetic flux to pass through.

The iron core 21 has a back yoke 20 formed in an annular shape, and a plurality of teeth 26 formed so as to be spaced apart from the back yoke 20 in the circumferential direction Z and project to the inner side X2 in the radial direction X. The iron core 21 is formed by a divided core 211 obtained by dividing the back yoke 20 between the teeth 26 adjacent to the circumferential direction Z. Here, since the teeth 26 are formed at four locations, the iron core 21 is formed by four divided iron 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 teeth 26 and the back yoke 20. The insulator 23 is arranged between the iron core 21 and the coil 22 and plays a role of insulation. Any material may be used as long as it can be insulated, for example, resin, resin sheet, tape, paper or the like. Used.

The coil 22 may be wound in any way as long as it is arranged in the slot portion 9. Further, any material may be used for the coil 22 as long as it is conductive, and copper is used in this embodiment. The back yoke 20 is formed by a first back yoke portion 25 and a second back yoke portion 24. The first back yoke portion 25 is formed on the outer side X1 in the radial direction X of the teeth 26 so as to be separated from the inner wall 41 of the frame 4 to form the space portion 8 and to be convexly formed on the inner side X2 in the radial direction X. The space portion 8 is utilized 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 by passing the cooling body through the space portion 8. The cooling body may be any as long as it can cool the iron core 21, and a liquid or a gas is used.

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

As shown in FIG. 2, the length of the first back yoke portion 25 in the circumferential direction Z is L1. Further, the length of the teeth 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 the second back yoke portion 24 in one of the circumferential directions Z is L4 (hereinafter, the circumferential direction of the first back yoke portion 25). It is referred to as one length L4 of Z). Further, the length of the tooth 26 in the radial direction X is T3. Then, the divided iron core 211, that is, the iron core 21 is formed so that these relationships are L1 ≧ L2 × 2 and L4> T3.

However, since the coil 22 is installed, 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. Further, the length T3 is a length that can be installed by the length of one side on the short side of the square wire when the winding is a square wire.

The side surface of the first back yoke portion 25 in the axial direction Y on the outer side X1 in the radial direction is referred to as the third side surface 252, and the side surface in the axial direction Y on the inner side X2 in the radial direction X is referred to as the 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 the 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 the second side surface 241. Then, 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 arc shape. As a result, a large margin between the frame 4 and the iron core 21 can be secured.

Further, it is assumed that the width of the first side surface 242 of the second back yoke portion 24 and the second side surface 241 is T1, and the width of the third side surface 252 of the first back yoke portion 25 and the fourth side surface 251 is T2. , T1 = T2. Further, the length of the teeth 26 in the circumferential direction Z is formed in a relationship that L2 is 1.5 times or more, particularly twice or more, that of T1 and T2. In the teeth 26, the side surface in the axial direction Y of the inner side X2 in the radial direction X is the tip surface 262, and the side surface in the axial direction Y at both ends in the circumferential direction Z is the fifth side surface 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, a cross section perpendicular to the axial direction Y of the split core 211, and an intersection point between the teeth 26 and the first back yoke portion 25 on the outer line of the inner X2 of the radial direction X of the split core 211. That is, the intersection of the fifth side surface 261 of the teeth 26 and the fourth side surface 251 of the first back yoke portion 25 is P1, and the intersection of the first back yoke portion 25 and the second back yoke portion 24, that is, the first. The intersection of the fourth side surface 251 of the back yoke portion 25 and the second side surface 241 of the second back yoke portion 24 is P2, and the end portion of the inner X2 of the circumferential direction Z of the second back yoke portion 24, that is, the iron core 21. Let P3 be the midpoint of the circumferential direction Z between the teeth 26 adjacent to the circumferential direction Z in the second back yoke portion 24. 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 position different from that of the rotor 3 of the rotating shaft 6. A bearing frame 40 for installing the bearing portion 91 is formed so as to communicate with each other on the upper side of the frame 4 in the axial direction Y.

Then, the rotary electric machine 1 configured as described above is used to configure the blower 100 as shown in FIG. In FIG. 9, in the blower 100, the vane portion 92 is installed as a load portion at a position different from that of the rotor 3 of the rotating shaft 6. The blower 100 may be a vacuum cleaner or the like, as long as the air can be moved by the rotation of the vane 92.

Next, a method of manufacturing the rotary electric machine 1 and the blower 100 of the first embodiment configured as described above will be described. First, the insulator 23 is installed on the divided iron core 211 shown in FIG. Next, the coil 22 is formed on the teeth 26 via the insulator 23 (FIG. 4). At this time, the first back yoke portion 25 formed in a convex shape on the inner side X2 in the radial direction X is held as the positioning of the split iron core 211, and the winding is wound to form the coil 22. The winding method can be any method, and for example, spindle winding or fryer winding is used.

Next, as shown in FIG. 4, four divided iron cores 211 in which the coil 22 is installed are prepared and installed in an annular shape to form the iron core 21. Therefore, the back yoke 20 formed in an annular shape is formed (FIG. 5). Next, the second back yoke portion 24 is arranged in contact with the inner wall 41 of the frame 4, and the stator 2 is fixed in the 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 arranged on the rotating shaft 6.

Next, the rotation axis 6 is inserted in the direction of the arrow A shown in FIG. Here, the bearing portion 91 is inserted into the bearing frame 40. Further, the rotor 3 is installed so as to have an air gap 5 inside X2 in the radial direction X of the stator 2, and the rotary electric machine 1 is manufactured (FIG. 8). Next, the vane portion 92 is installed on the rotary shaft 6 protruding in the axial direction Y from the bearing frame 40 to manufacture the blower 100 (FIG. 9).

Next, the rotary electric machine of the first embodiment configured as described above, the manufacturing method of the rotary electric 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 such that L1 ≧ L2 × 2. Since the space portion 8 can be provided in a large size, the rotary electric machine 1 and the blower 100 can be made lighter, and a large passage through which the cooling body passes can be secured, the cooling performance of the rotary electric machine 1 and the blower 100 can be improved. Further, since the length L4 of one of the circumferential directions Z of the first back yoke portion 25 is formed larger than the length T3 of the radial direction X of the teeth 26, the length of the magnetic path can be shortened and the loss (iron loss) can be shortened. ) 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 arc shape, a large margin can be secured and the stator 2 can be prevented from coming off from the frame 4. Further, the mold shape of the iron core 21 can be simplified. It also facilitates assembly. Furthermore, it is possible to prevent a short circuit in the magnetic path and effectively utilize the magnetic flux.

Further, since 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, the mold shape of the iron core 21 can be simplified.

Further, 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 determined. Since it is configured in the relationship of T1 = T2, it is possible to prevent a short circuit of the magnetic path, effectively utilize the magnetic flux, and reduce the loss.

Further, since the first back yoke portion 25 can be used for positioning when winding the winding, it is possible to prevent the position shift of the iron core 21 and suppress the winding disorder of the coil 22. Therefore, the alignment 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 P1 between the teeth 26 and the first back yoke portion 25 and the first back yoke portion are on the outer line of the inner side X2 of the radial direction X of the iron core 21. The intersection P2 between the 25 and the second back yoke portion 24 and the midpoint 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 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 it is possible to easily wind the winding. Moreover, since the magnetic path can be shortened, the loss can be reduced. Since the relationship between the length T3 of the tooth 26 in the radial direction X 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, the example in which the core of the stator is formed by the split core is shown, but the present invention is not limited to this, and for example, the core is formed by one connected core to which the back yoke is connected. If so, the same can be done. Further, although the example in which the iron core of the stator is formed by laminating a plurality of thin plates in the axial direction is shown, the present invention is not limited to this, and it is also conceivable to form the iron core with a thick member in the axial direction. .. Further, since these matters are appropriately applicable to the following embodiments, the description thereof will be omitted.

Embodiment 2.
The second embodiment shows a case where the shape of the first back yoke portion 25 of the first embodiment is changed, and the changes from the first embodiment will be mainly described. 10 and 11 are top views showing one divided core of the stator of the stator of the rotary electric machine in the second embodiment. FIG. 10 is a diagram showing the length of each portion of the divided iron core. FIG. 11 is a diagram showing the positions of each portion of the divided iron core.

In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The fourth side surface 251 and the third side surface 252 of the first back yoke portion 25 are formed in a concentric arc shape. Therefore, when winding the winding, the third side surface 252 is held and the winding is performed. Further, at this time, the winding is wound by using the first back yoke portion 25, which is convex toward the inner side X2 in the radial direction X, for positioning.

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

Embodiment 3.
The third embodiment shows a case where the shape of the first back yoke portion 25 of each of the above-described embodiments is changed, and the changes from each of the above-described embodiments will be mainly described. 12 and 13 are top views showing one divided core of the stator of the stator of the rotary electric machine in the third embodiment. FIG. 12 is a diagram showing the length of each portion of the divided iron core. FIG. 13 is a diagram showing the positions of each portion of the divided iron core.

In the figure, the same parts as those of the above embodiments are designated by the same reference numerals and the description thereof will be omitted. A protrusion 27 projecting to the outer side X1 in the radial direction X is formed on the third side surface 252 of the outer side X1 in the radial direction X of the first back yoke portion 25. Then, a caulked portion 270 caulked in the axial direction Y is formed on the protrusion 27. As a result, 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 rotary electric machine of the third embodiment, the manufacturing method of the rotary electric machine, and the blower configured as described above have the same effects as those of the above-described embodiments, and of course, the first back yoke portion 25 has the same effect. Since the protrusion 27 is provided on the three side surfaces 251 and the caulking portion 270 crimped in the axial direction Y is formed on the protrusion 27, the caulking portion 270 does not interfere with the magnetic path, and the characteristics of the rotary electric machine and the blower. And prevent loss reduction.

Embodiment 4.
The fourth embodiment shows a case where the shape of the teeth 26 of each of the above-described embodiments is changed, and the differences from the above-mentioned embodiments will be mainly described. 14 and 15 are top views showing one split core of the stator core of the rotary electric machine according to the fourth embodiment. FIG. 14 is a diagram showing the length of each portion of the divided iron core. FIG. 15 is a diagram showing the positions of each portion of the divided iron core.

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

The rotary electric machine of the fourth embodiment, the manufacturing method of the rotary electric machine, and the blower configured as described above have the same effects as those of the above-described embodiments, and the tip surface 262 of the teeth 26 has. Since the second back yoke portion 24 is formed in an arc shape concentric with the second side surface 241 and the first side surface 242, the tip surface 262 and the first side surface 242 can be formed by forming the three circles with the concentric circles. Makes it easier to get the coaxial between the iron core 21 and the frame 4. Further, the length of the magnetic path between the front end surface 262 and the second side surface 241 can be shortened, the loss can be reduced, and the weight can be reduced.

Embodiment 5.
The fifth embodiment shows a case where the shape of the teeth 26 of each of the above-described embodiments is changed, and the differences from the above-mentioned embodiments will be mainly described. 16 and 17 are top views showing one split core of the stator core of the rotary electric machine according to the fifth embodiment. FIG. 16 is a diagram showing the length of each portion of the divided iron core. FIG. 17 is a diagram showing the positions of each portion of the divided iron core.

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

The rotary electric machine of the fifth embodiment, the manufacturing method of the rotary electric machine, and the blower configured as described above have the same effects as those of the above-described embodiments, and the tip surface 262 of the teeth 26 has the same effect. Since the first side surface 242 and the second side surface 241 are provided with a portion 264 formed in a concentric arc shape and a portion 265 formed in a planar shape, the arc-shaped portion 264 has three circles. By forming the above in concentric circles, it becomes easy to make the tip surface 262 and the first side surface 242 coaxial with the iron core 21 and the frame 4. Further, since the tip surface 262 of the tooth 26 is formed by the arc-shaped portion 264 and the planar-shaped portion 265, the cogging torque can be reduced.

In the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

1 Rotor, 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 protrusions, 40 bearing frame,
41 inner wall, 71 end cap, 91 bearing part, 92 vane part, 100 blower,
211 split core, 241 second side, 242 first side, 251 third side,
252 4th side surface, 261 5th side surface, 262 tip surface, 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 (11)

In a rotary electric machine having a stator installed inside a tubular frame and a rotor having a rotating shaft installed inside the stator in the radial direction.
The stator has a back yoke formed in an annular shape, an iron core having a plurality of teeth formed so as to be spaced apart from the back yoke in the circumferential direction and projecting inward in the radial direction, and winding around each of the teeth. It has a coil that is wound around the tooth and is housed in a slot portion surrounded by the tooth and the back yoke.
The back yoke has a first back yoke portion that forms a space portion on the radial outside of the tooth and is separated from the inner wall of the frame and is formed convexly on the inner side in the radial direction, and the first back. It is formed by 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.
Let L1 be the length of the first back yoke portion in the circumferential direction.
Let L2 be the length of the teeth in the circumferential direction.
The length from the center line of the first back yoke portion in the circumferential direction to one of the second back yoke portions is L4.
Assuming that the radial length of the tooth is T3,
It is formed by L1 ≧ L2 × 2 and L4> T3.
The third side surface on the outer side in the radial direction and the fourth side surface on the inner side in the radial direction of the first back yoke portion are concentric arcs formed in a concentric arc shape that is convex toward the inner side in the radial direction . The frame is formed in a cylindrical shape and has a cylindrical shape.
The rotary electric machine according to claim 1, wherein the inner wall of the frame, the first side surface on the outer side in the radial direction and the second side surface on the inner side in the radial direction of the second back yoke portion are formed in a concentric arc shape. The radial inner tip surface of the tooth is
The rotary electric machine according to claim 2, wherein the first side surface and the second side surface are formed in an arc shape concentric with the second side surface. The radial inner tip surface of the tooth is
The rotary electric machine according to claim 2, further 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 width between the radial outer first side surface and the radial inner second side surface of the second back yoke portion is T1.
Assuming that the width between the radial outer third side surface and the radial inner fourth side surface of the first back yoke portion is T2,
The rotary electric machine according to any one of claims 1 to 4 , which is formed by T1 = T2. On the radial inner outline of the core in a cross section perpendicular to the axis of the core.
The intersection of the teeth and the back yoke is P1.
The intersection of the first back yoke portion and the second back yoke portion is defined as P2.
When the midpoint in the circumferential direction between the teeth adjacent to the circumferential direction of the second back yoke portion is P3 ,
A straight line that passes through P1 and intersects the center line in the circumferential direction of the teeth perpendicularly.
A straight line that passes through P2 and intersects the center line in the circumferential direction of the teeth perpendicularly.
The straight line that passes through P3 and intersects the center line in the circumferential direction of the teeth perpendicularly is
One of claims 1 to 5 in the order of a straight line passing through P3, a straight line passing through P1, and a straight line passing through P2 from the inside in the radial direction in a cross section perpendicular to the axial direction of the iron core. The rotary electric machine described in. In a rotary electric machine in which the iron core of the stator is formed by laminating a plurality of thin plates in the axial direction.
A protrusion protruding outward in the radial direction is provided on the third side surface of the first back yoke portion on the outer side in the radial direction.
The rotary electric machine according to any one of claims 1 to 6 , wherein a crimped portion crimped in the axial direction is formed on the protrusion. The rotary electric machine according to any one of claims 1 to 7 , wherein the core of the stator is formed by a plurality of divided cores divided between the circumferential directions of the teeth in the circumferential direction. The rotary electric machine according to any one of claims 1 to 8 .
A blower provided with vanes installed on the rotating shaft of the rotating electric machine. The method for manufacturing a rotary electric machine according to any one of claims 1 to 9 .
A method for manufacturing a rotary electric machine, in which a third side surface on the outer side in the radial direction of the first back yoke portion is used for positioning and held, and a winding is wound around the tooth to form the coil. A rotary electric machine including a stator installed inside a tubular frame and a rotor having a rotating shaft installed inside the stator in the radial direction.
The stator has a back yoke formed in an annular shape, an iron core having a plurality of teeth formed so as to be spaced apart from the back yoke in the circumferential direction and projecting inward in the radial direction, and winding around each of the teeth. It has a coil that is wound around the tooth and is housed in a slot portion surrounded by the tooth and the back yoke.
The back yoke has a first back yoke portion that forms a space portion on the radial outside of the tooth and is separated from the inner wall of the frame and is formed convexly on the inner side in the radial direction, and the first back. It is formed by 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.
Let L1 be the length of the first back yoke portion in the circumferential direction.
Let L2 be the length of the teeth in the circumferential direction.
The length from the center line of the first back yoke portion in the circumferential direction to one of the second back yoke portions is L4.
Assuming that the radial length of the tooth is T3,
In the manufacturing method of the rotary electric machine formed by L1 ≧ L2 × 2 and L4> T3,
A method for manufacturing a rotary electric machine, in which a third side surface on the outer side in the radial direction of the first back yoke portion is used for positioning and held, and a winding is wound around the tooth to form the coil.

Images