JP2008061319A - Stator, stator manufacturing method and inner ring - Google Patents

Abstract

An inner ring is provided on the inner periphery of a stator to increase the inner diameter roundness of the stator and improve motor characteristics.
A stator 10 of a motor configured by connecting a plurality of divided stator cores 11 in an annular shape, and an inner circumference in which inner circumferential surfaces of tooth portions 11a of the respective divided stator cores are arranged at predetermined intervals. The inner diameter ring 20 is attached to the inner peripheral surface of each of the tooth portions, and the gap between adjacent teeth portions interposed between the magnetic piece pieces. The stator is characterized in that the nonmagnetic material pieces 21 to be positioned are alternately arranged in the circumferential direction to form a ring shape having a predetermined inner diameter.
[Selection] Figure 1

Description

  The present invention relates to a stator of a motor, a method of manufacturing the stator, and an inner diameter ring attached to the stator core of the stator, and improves the motor characteristics by increasing the inner diameter roundness of the stator formed by arranging the divided stator cores in an annular shape. is there.

2. Description of the Related Art Conventionally, in a motor, a stator core (iron core) used for a stator disposed on the outer periphery of a rotor has a divided stator core obtained by dividing a ring-shaped stator core at a predetermined angle for reasons such as ease of winding and improvement of occupancy. It is used.
The split stator core is generally connected in an annular shape with a coil wound, and the split stator cores are fastened together by shrinking to form a ring-shaped stator.
The shrink-fitting is a method of fitting the outer peripheral surface of a split stator core that is heated and expanded to the outer peripheral surface of an annularly connected split stator core and cooling the shrink-fitting ring to reduce the inner diameter. This is a method in which the divided stator cores are fastened by pressing with bamelling.

  Since the motor characteristics are greatly affected by the gap (interval) between the stator core and the rotor, when the stator core is a split stator core, the inner circumference of each split stator core is not varied, and the inner diameter roundness of the stator is increased. It is desired to improve the motor characteristics by sufficiently designing the gap, designing the rotor diameter as large as possible, and making the gap between each divided stator core and the rotor constant. Here, the roundness represents a difference between the maximum diameter and the minimum diameter.

JP, 2005-354838, A stator core is provided as a stator which divided and formed a divided stator core.
As shown in FIG. 7A, the stator core 1 is configured by connecting a plurality of stator core components 2 in the circumferential direction along the periphery of the rotor core 3. As shown in FIG. 7B, the stator core component 2 is opposed to the yoke portion 2a, the tooth portion 2b projecting from the yoke portion 2a to the inner peripheral side, and the yoke portion 2a across the tooth portion 2b. 2c and a coil 2d wound around the tooth portion 2b. A side surface 2e of the yoke portion 2a is a flat surface, and an inner peripheral surface 2f of the flange portion 2c is disposed to face the rotor core 3. The yoke portions 2a are arranged in the circumferential direction so as to be continuous in an annular shape, and the stator core components 2 are fastened together.

JP 2005-354838 A

  However, in the stator core 1 of Patent Document 1, when the stator core components 2 are fastened together by shrinkage, the side surfaces 2e of the yoke portions 2a that become the joint surfaces of the stator core components 2 are made to be slidable in the radial direction. Therefore, there is a problem that the stator core components 2 cannot be positioned with each other, and the inner peripheral surface 2f of the stator core component 2 tends to vary in the radial direction. For this reason, the inner-surface roundness of the stator core 1 tends to be low, and it is difficult to design a gap between the stator core 1 and the rotor core 3, and there is a problem that the gap is not constant and the characteristics of the motor are deteriorated.

  The present invention has been made in view of the above problems, and when the divided stator cores are arranged in an annular shape and fastened to form a ring-shaped stator, the inner diameter roundness of the stator is increased and the motor characteristics are improved. It is an issue.

In order to solve the above problems, as a first invention, a stator of a motor in which a plurality of divided stator cores are arranged in an annular shape,
A stator having an inner diameter ring assembled on the inner peripheral side of each of the divided stator cores is provided.

The divided stator core has a back yoke portion and a teeth portion that protrudes inward from the back yoke portion.
A specific shape of the inner ring includes a magnetic piece that is brought into contact with the inner peripheral side of the stator core, and a non-magnetic piece that is interposed between the magnetic pieces and positioned in a gap between adjacent teeth. It is preferable that the ring shape is arranged alternately in the circumferential direction and has a predetermined inner diameter.

Each of the magnetic pieces of the inner diameter ring has a recess that is fitted on the inner peripheral end of each tooth portion, the inner bottom surface of which is in contact with the inner peripheral surface of each tooth portion, and the outer bottom surface is disposed inside. While making the circumference forming surface and making the side surface in the recess abut on both side surfaces of the tooth portion,
Each non-magnetic piece has a T-shape consisting of a vertical axis and a horizontal axis, and the tip surface of the vertical axis is made continuous with the inner circumference forming surface of the adjacent magnetic piece to form a predetermined inner diameter, and It is preferable that the vertical axis is closely fitted between the side portions of the adjacent magnetic body pieces, and the tip end surface of the horizontal axis is in contact with the side surface of the tooth portion.

  The present invention uses the inner diameter ring in order to increase the inner diameter roundness of the stator. Since the magnetic piece of the inner ring is in contact with the inner peripheral surface of the tooth portion of each divided stator core, the divided stator core and the magnetic piece are electromagnetically integrated, and the inner diameter of the inner ring is the inner diameter of the stator. . By assembling the inner peripheral surface of the stator into an integral part with an inner diameter ring and making the inner diameter of the inner diameter ring a perfect circle, variation in shrinkage can be suppressed and the inner diameter roundness of the stator can be increased. it can. The inner diameter roundness of the stator is preferably 0.05 mm or less.

Further, in the motor, the smaller the gap between the rotor and the stator, the smaller the leakage magnetic flux when the magnetic flux flows from the stator to the rotor. When the inner diameter ring is all non-magnetic, the distance from the inner peripheral end of the teeth portion of the split stator core to the rotor becomes a gap, but the inner diameter ring exists between the rotor and the stator. Can not be reduced.
On the other hand, in the present invention, the gap between the rotor and the stator is the gap between the magnetic piece of the inner ring and the rotor, so that the inner ring is formed between the rotor and the stator rather than the non-magnetic piece. The gap can be reduced, and magnetic flux leakage can be reduced.

The divided stator core is preferably made of a dust magnetic material. This is because the powder magnetic material can be easily formed in three dimensions, and can be finely pulverized at low cost, so that the core and the winding can be easily separated when the motor is discarded, and the recycle property is high.
The divided stator core may be composed of laminated steel plates.

  The inner ring is a ring made of a non-magnetic material having a predetermined inner diameter. The inner ring is provided with holes at predetermined intervals in the circumferential direction. The inner peripheral end of the teeth is inserted into each hole, and the teeth are inserted. The inner peripheral surface of the part may be exposed and positioned on the inner peripheral end surface of the hole.

Since the inner ring is integrally formed only on the non-magnetic material, it is not necessary to assemble the non-magnetic material piece and the magnetic material piece, and it can be made simple and inexpensive. In addition, since the tooth portion is exposed by providing a hole in the nonmagnetic material, the gap between the inner peripheral surface of the tooth portion and the rotor does not increase.
Furthermore, since the inner diameter ring is composed of one part, the stator comprising the inner peripheral surface of the teeth portion that is exposed to the surface of the hole of the inner diameter ring when the inner diameter retaining ring is formed with high roundness accuracy. The roundness of the inner diameter can be increased.

As a second invention, a method for manufacturing a stator according to any one of claims 1 to 4 is provided. The method
Using split stator core and inner ring,
Winding the teeth of the divided stator core,
Next, after the winding is completed, the back yoke portion continuously provided at the end portion of the teeth on the outer peripheral side of the stator is assembled in an annular shape in contact with the back yoke portion of the adjacent divided stator core,
Assemble the inner ring on the inner peripheral side where the teeth are located,
Next, an outer ring for shrinking is fitted on the outer peripheral surface of the back yoke portion assembled in an annular shape, and the outer stator is shrinked so that the split stator core is pressed against the inner ring side by the outer ring. It is characterized by being fastened.

According to the above-described configuration, the outer ring for shrink shrinkage is externally fitted, and the split stator core is pressed against the inner diameter ring side, so that the inner diameter roundness of the stator can be increased by assembling the inner diameter ring. it can.
On the other hand, it is conventionally known that torque is easily generated by providing a convex portion (a collar portion) on the side surface on the inner peripheral end side of the tooth portion. In the present invention, after the winding is performed, the inner ring is assembled on the inner peripheral side of the stator, so that the magnetic piece comes into contact with the teeth portion of the divided stator core. Since both side portions of the magnetic piece serve as convex portions on the side surface on the inner peripheral end side of the tooth portion, torque can be easily generated.

As a third invention, a magnetic piece to be brought into contact with the inner peripheral side of a plurality of divided stator cores having a back yoke portion and a teeth portion protruding inward from the back yoke portion in a stator,
A non-magnetic material piece positioned between the magnetic material pieces and positioned in a gap between adjacent teeth of the divided stator core;
An inner ring is provided, wherein the magnetic piece and the non-magnetic piece are alternately arranged in a circumferential direction to form a ring shape having a predetermined inner diameter.

  Since the inner diameter ring alternately arranges the magnetic pieces and the non-magnetic pieces in the circumferential direction, the magnetic piece is attached to the teeth portion, so that the magnetic piece becomes a convex portion of the tooth portion (the flange portion). ). In addition, the inner ring can be manufactured in advance with increased inner diameter accuracy, and the inner ring can be assembled to the stator so that the inner diameter of the inner ring can maintain a perfect circle.

As described above, according to the stator of the present invention, the inner ring whose inner diameter is a perfect circle is assembled to the split stator core connected in an annular shape, and the inner peripheral surface of the stator is configured as an integral part by the inner ring. Therefore, the inner diameter roundness of the stator can be increased and the motor characteristics can be improved.
Further, according to the stator manufacturing method of the present invention, since the inner ring prevents the variation in the inner peripheral side of the divided stator core during shrinkage, a stator having a high inner diameter is easily manufactured. be able to.

Embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention. 1A is a perspective view of the stator 10, FIG. 1B is a sectional view, and FIG. 2 is an enlarged view of the stator.
The motor 100 includes a stator 10 that is disposed with a predetermined gap around the outer periphery of a rotor (not shown). The stator 10 is configured by connecting a plurality of split stator cores 11 in an annular shape around a center point P1, and an inner ring 20 and an outer ring for shrink fitting for fixing the outer periphery of the split stator core 11 to the outside. 30.

  The divided stator core 11 includes a tooth portion 11a, a back yoke portion 11b continuously provided on the outer periphery of the tooth portion, and a winding (not shown) wound around the tooth portion 11a. The stator core 11 is assembled in an annular shape in contact with the back yoke portion 11 b of the stator core 11.

  The inner diameter ring 20 is assembled to the inner periphery where the inner peripheral surface 11c of the tooth portion 11a of the divided stator core 11 is arranged at a predetermined interval, and the magnetic piece to be brought into contact with the inner peripheral surface 11c of each tooth portion 11a. 22 and non-magnetic body pieces 21 interposed between the magnetic body pieces 22 and positioned in the gaps between the adjacent tooth portions 11a are alternately arranged in the circumferential direction to form a ring shape having a predetermined inner diameter.

The magnetic piece 22 has a concave cross-sectional shape that is fitted to the inner peripheral end of each tooth portion 11a, and the bottom inner surface 22a abuts against the entire inner peripheral surface 11c of each tooth portion 11b and forms the outer surface of the bottom portion. A surface 22b is formed, and both side portions 22c are in contact with both side surfaces 11d of the tooth portion 11a.
The magnetic piece 22 and the divided stator core 11 are formed of the same material, and in this embodiment, iron powder is compression-molded and manufactured.

  The non-magnetic piece 21 has an inverted T-shaped cross section composed of a vertical axis and a horizontal axis, and the front end surface of the vertical axis is used as an inner circumference forming surface 21a to be continuous with the inner circumference forming surface 22b of the adjacent magnetic piece 22. To form a predetermined inner diameter. Further, the vertical axis is tightly fitted between the side portions 22c of the adjacent magnetic body pieces 22, and the lateral axis 21b on the outer peripheral side is placed on the outer surface of the side portion 22c of the magnetic body piece 22 so that the side surface of the adjacent tooth portion 11a. 11d.

The nonmagnetic piece 21 is formed of a resin made of, for example, PPS resin.
The inner diameter ring in which the non-magnetic piece 21 and the magnetic piece 22 are alternately connected and integrated in a ring shape is, for example, non-filled with the magnetic piece 22 filled in a predetermined position in a mold. The resin constituting the magnetic piece 22 is filled, so to speak, the magnetic piece 22 is formed integrally with a non-magnetic piece.
The magnetic piece 22 and the non-magnetic piece 21 may be integrated by being fixed with an adhesive.

  Windings (not shown) wound around the teeth portion 11 a of the divided stator core 11 are disposed between the teeth portions 11 a of the adjacent divided stator cores and in the space 12 surrounded by the nonmagnetic member 21.

Next, a method for manufacturing the stator 10 will be described.
FIG. 3A shows the first step, in which the winding 13 is wound around the tooth portion 11 a of each divided stator core 11.
FIG. 3 (B) shows the second step, in which the back yoke portion 11b continuously provided on the outer periphery of the tooth portion 11a is assembled in an annular shape in contact with the back yoke portion 11b of the adjacent divided stator core. . 3B to 3D, the winding 13 is not shown.
FIG. 3C shows a third step, in which the inner diameter ring 20 is assembled to the inner peripheral side where the tooth portion 11a is located at a predetermined interval.
FIG. 3 (D) shows a fourth step, in which an outer ring 30 for shrink shrinkage is fitted on the outer peripheral surface of the back yoke portion 11b assembled in an annular shape.

The shrink ring outer ring 30 has an inner diameter smaller than the outer diameter of the split stator core 11, and is thermally expanded to be larger than the outer diameter of the split stator core 11.
When the shrink ring outer ring 30 cools, the shrink ring outer ring 30 is reduced in diameter and is shrinked so that the divided stator core 11 is pressed against the inner diameter ring 20 side, and is fastened integrally.
At this time, since the inner diameter of the split stator core 11 is determined by the inner diameter ring 20, the inner diameter roundness of the stator 10 can be increased by assembling so that the inner diameter of the inner diameter ring 20 is a perfect circle. Further, since the roundness of the outer diameter is determined by the shrink ring outer ring 30, the split stator core 11 can increase the roundness of both the outer diameter and the inner diameter.

FIG. 4 shows a second embodiment of the present invention. FIG. 4 (A) is a perspective view of the stator 10, and FIG. 4 (B) is a perspective view of the inner diameter ring 20.
The inner diameter ring 20 is formed of only a nonmagnetic material 21 having a predetermined inner diameter, and is a ring in which the length of the inner diameter ring 20 is slightly longer than the axial length of the stator 10, with a predetermined interval in the circumferential direction. A hole 21c is provided, and the inner peripheral end portion of the tooth portion 11a is inserted into each hole 21c so that the inner peripheral surface 11c of the tooth portion 11a is exposed to the inner peripheral end surface of the hole.

In the second embodiment, by using only the non-magnetic member 21 as the inner diameter ring 20, the inner diameter ring 20 can be easily formed by molding with resin or the like. Moreover, the inner diameter roundness of the stator can be increased by assembling and shrinking the inner diameter ring 20 so that the inner diameter of the stator becomes a perfect circle.
On the other hand, since the inner peripheral surface 11c of the teeth portion 11a and the inner peripheral surface of the inner diameter ring 20 can be made continuous, the magnetic piece 22 of the inner diameter ring 20 of the first embodiment is simply changed to a non-magnetic piece 21. Thus, the gap between the rotor and the stator 10 becomes smaller than the inner diameter ring 20 made of the nonmagnetic material 21.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 5 shows a third embodiment of the present invention.
After manufacturing the stator 10 by the method for manufacturing the stator 10 described in the first embodiment, the inner ring 20 is removed as a fifth step.
Since the inner diameter ring 20 is assembled and baked, even if the inner diameter ring 20 is removed, the inner diameter roundness of the stator 10 is maintained as in the state in which the inner diameter ring 20 is assembled. Further, since the stator 10 is fixed by the shrink ring outer ring 30, the stator 10 will not be disassembled even if the inner diameter ring 20 is removed.
By removing the inner ring 20 after shrinking, the structure of the stator 10 can be simplified and the size can be reduced.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 6 shows a fourth embodiment of the present invention.
After manufacturing the stator 10 by the method for manufacturing the stator 10 described in the first embodiment, the shrink ring outer ring 30 is removed as a fifth step. Since the stator 10 is fixed by the inner diameter ring 20, the stator 10 will not be disassembled even if the outer ring 30 for shrinkage is removed. By removing the outer ring 30 for shrinkage after shrinkage, the structure of the stator 10 can be simplified and the motor can be miniaturized.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In addition, this invention is not limited to the said embodiment, The various form within the claim of this invention is included.

(A) is a perspective view which shows 1st Embodiment of the stator of the motor which is this invention, (B) is sectional drawing of an internal diameter ring. It is an enlarged view of a stator. It is explanatory drawing of a manufacturing method, (A) is a 1st process, (B) is a 2nd process, (C) is a 3rd process, (D) is a figure which shows a 4th process. (A) is a perspective view which shows 2nd Embodiment, (B) is a perspective view of an internal diameter ring. It is a perspective view which shows 3rd Embodiment. It is a perspective view which shows 4th Embodiment. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Split stator core 11a Teeth part 11b Back yoke part 20 Inner diameter ring 21 Nonmagnetic piece 22 Magnetic piece 30 Outer ring for shrink

Claims (6)

A stator of a motor in which a plurality of divided stator cores are arranged in an annular shape,
A stator comprising an inner diameter ring assembled on the inner peripheral side of each of the divided stator cores. The split stator core has a back yoke portion and a teeth portion that protrudes inward from the back yoke portion.
The inner diameter ring alternately includes magnetic pieces that are in contact with the inner peripheral side of the divided stator core and non-magnetic pieces that are interposed between the magnetic pieces and are positioned in the gaps between adjacent teeth. The stator according to claim 1, wherein the stator has a ring shape having a predetermined inner diameter. Each of the magnetic pieces of the inner diameter ring has a recess that is fitted on the inner peripheral end of each tooth portion, the inner bottom surface of which is in contact with the inner peripheral surface of each tooth portion, and the outer bottom surface is disposed inside. While making the circumference forming surface and making the side surface in the recess abut on both side surfaces of the tooth portion,
Each non-magnetic piece has a T-shape consisting of a vertical axis and a horizontal axis, and the tip surface of the vertical axis is made continuous with the inner circumference forming surface of the adjacent magnetic piece to form a predetermined inner diameter, and The stator according to claim 1 or 2, wherein the longitudinal axis is closely fitted between side portions of adjacent magnetic pieces, and the tip end surface of the horizontal axis is in contact with a side surface of the tooth portion.   The inner ring is a ring made of a non-magnetic material having a predetermined inner diameter. The inner ring is provided with holes at predetermined intervals in the circumferential direction. The inner peripheral end of the teeth is inserted into each hole, and the teeth are inserted. The stator according to claim 1, wherein the inner peripheral surface of the portion is positioned so as to be exposed on the inner peripheral end surface of the hole. Using the divided stator core and the inner diameter ring according to any one of claims 1 to 4,
Winding the teeth of the divided stator core,
Next, after the winding is completed, the back yoke portion continuously provided at the end portion of the teeth on the outer peripheral side of the stator is assembled in an annular shape in contact with the back yoke portion of the adjacent divided stator core,
Assemble the inner ring on the inner peripheral side where the teeth are located,
Next, an outer ring for shrinking is fitted on the outer peripheral surface of the back yoke portion assembled in an annular shape, and the outer stator is shrinked so that the split stator core is pressed against the inner ring side by the outer ring. A method of manufacturing a stator, wherein the stator is fastened. A magnetic piece to be brought into contact with the inner peripheral side of a plurality of divided stator cores having a back yoke portion and teeth portions projecting inward from the back yoke portion to the stator;
A non-magnetic material piece positioned between the magnetic material pieces and positioned in a gap between adjacent teeth of the divided stator core;
An inner diameter ring, wherein the magnetic piece and the non-magnetic piece are alternately arranged in a circumferential direction to form a ring shape having a predetermined inner diameter.

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