JP7056220B2 - Stator and rotary electric machine - Google Patents

Description

The present invention relates to a stator and a rotary electric machine.

As a stator of a motor, a configuration in which a plurality of divided cores are arranged in an annular shape and covered with a yoke from the outside is known (see, for example, Patent Document 1).

As a method for manufacturing the above-mentioned stator, for example, a plurality of divided cores are arranged in an annular shape, temporarily press-fitted from the outside to the inside with a jig to align them, and then inside a bottomed cylindrical yoke. A method of manufacturing by press-fitting is known.

Japanese Unexamined Patent Publication No. 2012-23961

By the way, a strip-shaped yoke (belt-shaped yoke) may be wound around a stator core composed of a split core, and both ends of the strip-shaped yoke may be joined to attach the strip-shaped yoke to the stator core.
In such a case, when joining both ends of the strip-shaped yoke, the force applied to the joint becomes non-uniform depending on the positional relationship between the joint of the strip-shaped yoke and the stator core, and the joining state of the strip-shaped yoke is balanced. It may be missing.
That is, it is an issue to improve the mounting accuracy of the strip-shaped yoke to the stator core.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator and a rotary electric machine capable of improving the mounting accuracy of a strip-shaped yoke to a stator core.

According to the stator according to the present invention, the subject includes a stator provided in a rotary electric machine, a stator core through which a rotating shaft is inserted, and a strip-shaped yoke wound around an outer peripheral portion of the stator core. The yoke has a joint portion for joining both ends in the circumferential direction while being wound around the stator core, and the joint portion is arranged at a position overlapping the central portion of the stator core in the axial center of the stator core, and is arranged in the circumferential direction. It has a convex portion provided at the first end portion and a concave portion provided at a second end portion different from the first end portion in the circumferential direction, and the axial length of the yoke is the shaft of the stator core. The convex portion is longer than the length in the direction, and the convex portion is configured to have a size wider than the axial width of the connecting portion connected to the first end portion and the axial width of the connecting portion, and a hole portion is formed inside. The problem is solved by joining the first end portion and the second end portion of the yoke by crimping the convex portion into the concave portion .
In this way, by arranging the joint portion of the yoke facing the central portion of the stator core of the stator core, the force can be evenly applied to the joint portion of the yoke. As a result, when the yoke is attached to the stator core, the joint state of both ends of the yoke can be improved.
Therefore, according to the above-mentioned stator, the mounting accuracy of the yoke to the stator core is good.
Further, by doing so, the yoke can be attached to the stator core by caulking by applying a force in the circumferential direction. Therefore, it is possible to suppress deformation of the stator core when the yoke is attached to the stator core.

In the above stator, it is preferable that the joint portion is arranged at a position where the central portion of the joint portion at the center in the axial direction and the central portion of the stator core overlap.
By doing so, the mounting accuracy of the yoke to the stator core can be further improved.

In the above stator, the outer peripheral portion of the stator core may be arranged so as to be hidden by the outer surface of the yoke in a side view.
By doing so, the yoke can apply an inward tightening force to the entire outer surface of the stator. As a result, the force is evenly applied to the outer surface of the stator core, so that deformation of the stator core can be suppressed.

In the above stator, the stator core may be configured to have a plurality of divisible teeth arranged in an annular shape.
According to the above-mentioned stator, a plurality of teeth constituting the stator core can be appropriately aligned by winding the yoke around the stator core and attaching the yoke.

Further, according to the rotary electric machine of the present invention, the above-mentioned problem is solved by providing the above-mentioned stator.
By doing so, the balance of the stator constituting the rotary electric machine can be improved.

According to the stator and rotary electric machine of the present invention, the mounting accuracy of the strip-shaped yoke to the stator core can be improved.

It is a schematic block diagram of the pump device provided with a motor. It is a side view of a stator. It is an exploded configuration diagram of a stator. It is a figure which shows the state before the joint part of the yoke. It is a figure explaining the structure of the joint part of a yoke. It is a figure which shows the joint state of the joint part of a yoke. It is a figure which shows the state which attached the yoke to the stator core.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7.
In the following embodiment, a motor (rotary electric machine) including a stator having a stator core through which a rotating shaft is inserted and a strip-shaped yoke wound around an outer peripheral portion of the stator core will be described.
The configuration described below is not limited to the present invention, and can be variously modified within the scope of the purpose of the present invention.

<Pump device 1>
FIG. 1 shows a schematic configuration diagram of a pump device 1 including a motor 2 according to the present embodiment. The pump device 1 is a device that sucks up and feeds a fluid by using a motor 2 as a power source.
As shown in FIG. 1, the pump device 1 includes a motor 2, a can 3, an inlet pipe 4, an outlet pipe 5, and an impeller 6 as a configuration.

The motor 2 is a brushless motor and mainly includes a rotor 7, a rotary shaft 8, and a stator 10.
The rotor 7 includes a permanent magnet. The rotor 7 is fixed to the rotating shaft 8 of the motor 2 and rotates integrally with the rotating shaft 8.
The rotary shaft 8 is held with the impeller 6 attached to the end near the inlet pipe 4, and the end far from the inlet pipe 4 is provided at the bottom of the rotor accommodating portion 3A of the can 3. It is held by the shaft holding portion 3B.

The can 3 has a rotor accommodating portion 3A and a stator accommodating portion 3C on opposite sides, thereby preventing fluid from entering the stator accommodating portion 3A from the rotor accommodating portion 3A. That is, the fluid enters the rotor accommodating portion 3A in which the rotor 7 and the rotating shaft 8 are held, but the can 3 prevents the fluid from entering the stator accommodating portion 3C.

The stator 10 has, as a main configuration, a stator core 20 and a strip-shaped yoke 30 wound around the outer peripheral portion 24 of the stator core 20.
The stator core 20 is configured by arranging a plurality of teeth 21 in an annular shape.
A winding portion 25 including a winding and a circuit wound around each of the plurality of teeth 21 of the stator core 20 is attached to the stator core 20. Then, the magnetic field is controlled by controlling the current flowing in each winding of the plurality of phases (for example, three phases) of the winding portion 25, whereby the rotor 7 is centered on the rotating shaft 8 with respect to the stator 10. Rotate. As the rotor 7 rotates, the impeller 6 fixed to the rotating shaft 8 also rotates integrally.
Then, by rotating the impeller 6, the fluid can be sucked from the inlet pipe 4 and the sucked fluid can be discharged from the outlet pipe 5.

<Structure of Stator 10 and Manufacturing Method of Stator 10>
Next, the configuration of the stator 10 provided in the motor 2 and the method of manufacturing the stator 10 will be described with reference to FIGS. 2 to 7.

The outline of each figure of FIGS. 2 to 7 is as follows.
FIG. 2 is a side view of the stator 10. The above side view corresponds to a view of the stator 10 from a direction perpendicular to the axial direction 8A, which is the extending direction of the rotating shaft 8.
FIG. 3 is an exploded configuration diagram of the stator 10.
FIG. 4 is a diagram showing a state before joining of the joining portion 35 of the yoke 30.
FIG. 5 is a diagram illustrating a configuration of a joint portion 35 of the yoke 30.
FIG. 6 is a diagram showing a joined state of the joined portion 35 of the yoke 30.
FIG. 7 is a diagram showing a state in which the yoke 30 is attached to the stator core 20.

As shown in FIGS. 2, 3 and 4, the strip-shaped yoke 30 is attached to the outer peripheral portion 24 of the stator core 20 in a wound state.
In FIG. 2, the stator core 20 arranged on the inner surface of the yoke 30 is shown by a broken line.

Here, the process of attaching the yoke 30 to the stator core 20 will be described with reference to FIGS. 3 to 7.

First, the configuration of the stator core 20 will be described.
As shown in FIGS. 4, 6 and 7, the stator core 20 is formed by arranging a plurality of divisible teeth 21 in an annular shape.
As shown in FIG. 4, the tooth 21 is made of a substantially T-shaped metal member, and has a tooth outer peripheral portion 21A, a tooth inner peripheral portion 21B, and a connecting portion 21C.
The tooth outer peripheral portion 21A constitutes the outer peripheral portion 24 of the stator core 20, and the tooth inner peripheral portion 21B constitutes the inner peripheral portion 23 of the stator core 20.
The outer surface of the outer peripheral portion 21A of the teeth and the inner surface of the inner peripheral portion 21B of the teeth are slightly curved.
Further, the connecting portion 21C connects the radial center portion of the tooth outer peripheral portion 21A and the radial center portion of the tooth inner peripheral portion 21B. A winding is wound around the connecting portion 21C.

In the following, the winding portion 25 attached to the stator core 20 will be omitted.
First, a plurality of teeth 21 constituting the stator core 20 are arranged in an annular shape and temporarily assembled. Then, as shown in FIG. 3, the temporarily assembled stator core 20 is arranged on the inner diameter determining jig 40.
Specifically, the stator core 20 is arranged on the inner diameter determining jig 40 with the insertion portion 41 of the inner diameter determining jig 40 passed through the opening inside the inner peripheral portion 23 of the stator core 20.

The inner diameter determining jig 40 has a base portion 42 and a columnar insertion portion 41 extending upward from the base portion 42.
Specifically, the diameter of the base 42 of the inner diameter determining jig 40 is larger than the diameter (outer diameter) from the center of the stator core 20 to the outer peripheral portion 24. This makes it possible for the base 42 to support the stator core 20.
The insertion portion 41 of the inner diameter determining jig 40 substantially coincides with the diameter (inner diameter) from the center of the stator core 20 to the inner peripheral portion 23. In other words, the diameter of the insertion portion 41 is selected according to the diameter of the inner peripheral portion 23 of the stator core 20, and the inner diameter of the stator core 20 is determined by the diameter of the insertion portion 41.

Next, as shown in FIG. 4, the yoke 30 to be wound around the outer peripheral portion 24 of the stator core 20 is set. The yoke 30 is a strip-shaped metal plate, and constitutes a magnetic circuit with the stator core 20.
Before joining the first end 32A and the second end 32B of the yoke 30, there is a gap between the yoke 30 and the outer peripheral portion 21A of the teeth 21, and burrs are generated. It is suppressed.

Here, as shown in FIGS. 3 and 5, in the yoke 30, the first end portion 32A and the second end portion 32B, which are both ends in the longitudinal direction of the yoke 30, can be joined by the joining portion 35. There is. The end portion in the longitudinal direction described above corresponds to the end portion in the circumferential direction when the yoke 30 is wound around the stator core 20.
The length of the yoke 30 in the longitudinal direction (length of the long side) is substantially the same as the circumference of the outer peripheral portion 24 of the stator core 20.

The configuration of the joint portion 35 will be described in detail. The joint portion 35 includes a convex portion 33 provided at the first end portion 32A and a concave portion 34 provided at the second end portion 32B.

The convex portion 33 is a protrusion extending outward along the longitudinal direction of the yoke 30 from the lateral direction of the first end portion 32A, that is, the central portion (center in the axial direction) of the axial direction 8A.
Specifically, the convex portion 33 has a head portion having a size wider than the width of the connecting portion 33A connected to the central portion of the first end portion 32A in the axial direction 8A and the width of the connecting portion 33A in the axial direction 8A. It has 33B. Here, a hole 33C is formed inside the head 33B, which makes the head 33B slightly deformable.

The recess 34 is a notch formed inward from the second end 32B.
Specifically, the recess 34 has an inlet portion 34A formed inward from the central portion of the second end portion 32B in the axial direction 8A, and a holding portion 34B formed further inward from the inlet portion 34A.
The inlet portion 34A is configured to have a width substantially equal to that of the connecting portion 33A of the convex portion 33. Further, the holding portion 34B is configured to have substantially the same size as the head 33B.

Then, as shown in FIG. 6, a force is applied to the yoke 30 in a direction in which the first end portion 32A and the second end portion 32B are brought closer to each other. Hereinafter, the above processing is referred to as caulking processing.
At this time, as shown in FIG. 6, since the teeth 21 are pressed from the yoke 30 toward the center, the inner peripheral portions 21B of the teeth are aligned at the positions where they are in contact with the insertion portion 41. Therefore, the positions of the outer peripheral portions 21A of the teeth 21 of each teeth 21 are also aligned.
As a result, the yoke 30 can be wound while maintaining good roundness of the stator core 20.

Then, when the above-mentioned caulking process is continued and the head 33B of the convex portion 33 comes into contact with the inlet portion 34A of the concave portion 34, the head 33B deforms and enters the holding portion 34B through the inlet portion 34A of the concave portion 34. As a result, as shown in FIG. 7, the convex portion 33 of the joint portion 35 is fitted into the concave portion 34, and the first end portion 32A and the second end portion 32B of the yoke 30 are joined.

Here, with reference to FIG. 2, the relationship between the arrangement of the joint portion 35 of the yoke 30 and the stator core 20 will be described.
As shown in FIG. 2, the length H2 of the yoke 30 in the axial direction 8A is longer than the length H1 of the stator core 20 in the axial direction 8A.

Further, the stator core central portion 22, which is the central portion of the stator core 20 in the axial direction 8A, is arranged at a position overlapping the joint portion 35 in the side view.
In particular, it is preferable that the stator core central portion 22 is arranged at a position overlapping the joint portion central portion 36, which is the central portion of the joint portion 35 in the axial direction 8A in the side view.

The central portion 22 of the stator core may pass through the center of the stator core 20 in the axial direction 8A and coincide with a line perpendicular to the axial direction 8A (stator core center line 22A).
Further, the central portion 36 of the joint portion may pass through the center of the joint portion 35 in the axial direction 8A and coincide with a line perpendicular to the axial direction 8A (joint portion center line).

Further, the outer peripheral portion 24 of the stator core 20 is arranged so as to be hidden by the outer surface 31A of the yoke 30 in a side view. In other words, the outer peripheral portion 24 of the stator core 20 is covered with the yoke 30.

By arranging the stator core 20 and the yoke 30 as described above, in order to attach the yoke 30 to the stator core 20, when caulking the yoke 30, a load can be evenly applied to the joint portion 35. It will be possible.
As a result, the yoke 30 can be accurately attached to the stator core 20 while maintaining the roundness of the stator core 20.

<Summary>
The main features of the stator 10 according to the present embodiment described above and the motor 2 provided with the stator 10 are as follows.

[1] The stator 10 is provided in the motor 2 (rotary electric machine). The stator 10 has a stator core 20 through which the rotating shaft 8 is inserted, and a strip-shaped yoke 30 wound around the outer peripheral portion 24 of the stator core 20. The yoke 30 has a joint portion 35 for joining both ends in the circumferential direction while being wound around the stator core 20. The joint portion 35 is arranged at a position overlapping the central portion 22 of the stator core in the axial direction of the stator core 20, and the axial length of the yoke 30 is longer than the axial length of the stator core 20.
By arranging the joint portion 35 of the yoke 30 facing the stator core central portion 22 of the stator core 20 in this way, the force can be evenly applied to the joint portion 35 of the yoke 30. As a result, when the yoke 30 is attached to the stator core 20, the joint state of both ends of the yoke 30 can be improved.
Therefore, according to the above-mentioned stator 10, the mounting accuracy of the yoke 30 with respect to the stator core 20 is good.

[2] In the stator 10, the stator 10 is arranged at a position where the central portion 36 of the joint portion at the center of the joint portion 35 in the axial direction and the central portion 22 of the stator core overlap.
By doing so, the mounting accuracy of the yoke 30 to the stator core can be further improved.

[3] In the above stator 10, the joint portion 35 is a concave portion 34 provided in a convex portion 33 provided in the first end portion 32A in the circumferential direction and a second end portion 32B different from the first end portion 32A in the circumferential direction. And have. By crimping the convex portion 33 to the concave portion 34, the first end portion 32A and the second end portion 32B of the yoke 30 are joined.
By doing so, the yoke 30 can be attached to the stator core 20 by caulking in which a force is applied in the circumferential direction. Therefore, it is possible to suppress deformation of the stator core 20 when the yoke 30 is attached to the stator core 20.

[4] In the stator 10, the outer peripheral portion 24 of the stator core 20 is arranged so as to be hidden by the outer surface 31A of the yoke 30 in a side view.
By doing so, the yoke 30 can apply an inward tightening force to the entire outer surface 31A of the stator 10. As a result, the force is evenly applied to the outer surface 31A of the stator core 20, so that deformation of the stator core 20 can be suppressed.

[5] In the above stator 10, the stator core 20 is configured to have a plurality of divisible teeth 21 arranged in an annular shape.
According to the above-mentioned stator 10, by winding the yoke 30 around the stator core 20 and attaching the yoke 30, a plurality of teeth 21 constituting the stator core 20 can be appropriately aligned.

[6] Further, the motor 2 includes the stator 10 according to the above [1] to [5].
By doing so, the balance of the stator 10 constituting the motor 2 (rotary electric machine) can be improved.

<Other embodiments>
The present invention is not limited to the above embodiment.
For example, the shape of the joint portion 35 is not limited to the above example.
Specifically, the convex portion 33 may be configured in a T shape and the concave portion 34 may be configured in a rectangular shape.
Further, in the above example, an example in which one pair of the convex portion 33 and the concave portion 34 is provided in the joint portion 35 is shown, but even if the joint portion 35 is provided with a plurality of pairs of the convex portion 33 and the concave portion 34. good.
Further, the motor according to the present invention can be applied to devices other than the pump device 1.

1 Pump device 2 Motor 3 Can 3A Rotor accommodating part 3B Shaft holding part 3C Stator accommodating part 4 Inlet pipe 5 Outlet pipe 6 Impeller 7 Rotor 8 Rotating shaft 8A Axial direction 10 Stator 20 Stator core 21 Teeth 21A Teeth outer circumference 21B Teeth inner circumference 21C Connecting part 22 Stator core center part 22A Stator core center line 23 Inner peripheral part 24 Outer peripheral part 25 Winding part 30 York 30A Main part 31A Outer side surface 31B Inner side surface 32A First end part 32B Second end part 33 Convex part 33A Connection part 33B Head 33C Hole 34 Recess 34A Inlet 34B Holding 35 Joint 36 Joint center 37 Claw engagement hole 40 Inner diameter determination jig 41 Insertion 42 Base

Claims (5)

It is a stator provided in a rotary electric machine,
The stator core through which the rotating shaft is inserted and
It has a strip-shaped yoke that is wound around the outer peripheral portion of the stator core, and has.
The yoke is
It has a joint portion that joins both ends in the circumferential direction while being wound around the stator core.
The joint portion is arranged at a position overlapping the central portion of the stator core in the axial center of the stator core, and the convex portion provided at the first end portion in the circumferential direction is different from the first end portion in the circumferential direction. It has a recess provided at the end and
The axial length of the yoke is longer than the axial length of the stator core.
The convex portion has a connecting portion connected to the first end portion and a head portion having a size wider than the axial width of the connecting portion and having a hole formed inside. ,
A stator characterized in that the first end portion and the second end portion of the yoke are joined by caulking the convex portion into the concave portion . The stator according to claim 1, wherein the central portion of the joint portion at the center in the axial direction and the central portion of the stator core are arranged at overlapping positions. The stator according to claim 1 or 2 , wherein the outer peripheral portion of the stator core is arranged so as to be hidden by the outer surface of the yoke in a side view. The stator according to any one of claims 1 to 3 , wherein the stator core has a plurality of divisible teeth arranged in an annular shape. A rotary electric machine provided with the stator according to any one of claims 1 to 4 .

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