JP5341328B2 - Stator - Google Patents

Description

The present invention relates to a stator formed by assembling a split stator, to reduce iron loss in the stator core segments, thereby improving motor characteristics.

  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 is a divided stator obtained by dividing a ring-shaped stator into a predetermined angle for reasons such as ease of winding and improvement of occupancy. In many cases, a coil is formed in advance by winding around the core of each divided stator, and these divided stators are assembled in a ring shape.

Specifically, the split stator core is arranged in an annular shape with a coil wound thereon, and a shrink link is fitted around the outer periphery of the split stator core and fastened to form a stator.
That is, the shrink bake ring is preheated and expanded, and is fitted onto the outer peripheral surface of the split stator core arranged in an annular shape in this state. The surface is pressed by baking bakeling, and the divided stator cores are fastened.

JP, 2005-354838, A (patent documents 1) is provided as a stator which forms the above-mentioned division stator core integrally. As shown in FIG. 7A, the stator 1 of Patent Document 1 is configured by connecting a plurality of stator core components 2 along the circumference of the rotor core 3 in the stator circumferential direction.
As shown in FIG. 7 (B), the stator core component 2 has a yoke portion 2a, a teeth portion 2b projecting from the yoke portion 2a toward the inner peripheral side, and is opposed to the yoke portion 2a across the teeth portion 2b. The provided collar part 2c and the coil 2d wound around the teeth part 2b are provided. The stator 1 is arranged in such a manner that the end surface of the yoke portion 2a in the stator circumferential direction is annularly continuous in the stator circumferential direction with the joint end surface 2e, and the stator core components 2 are fastened together.

JP 2005-354838 A

The magnetic flux generated by the coil 2d wound around the tooth portion 2b flows through the both side portions of the yoke portion 2a projecting from the tooth portion 2b in the circumferential direction of the stator to the adjacent yoke portion 2a. Since the magnetic flux takes the shortest distance path, the magnetic flux density on the inner peripheral end side 2f is locally high at the joint portion between the adjacent yoke portions 2a, and the magnetic flux density tends to be non-uniform.
In the magnetic material core, the loss of electric energy, that is, the iron loss, which causes the motor characteristics to deteriorate, is approximately proportional to the 1.6th power of the magnetic flux density. Therefore, when the magnetic flux is not uniform, the iron loss increases and the magnetic flux density is locally increased, so that the magnetic flux is saturated and leakage magnetic flux may be generated. There is a problem that is easy to get worse.

  This invention is made | formed in view of the said problem, and makes it a subject to eliminate a magnetic flux density nonuniformity by reducing the shape of a division | segmentation stator core, to reduce an iron loss, and to improve a motor characteristic. .

In order to solve the above problems, as a first invention, a stator of a motor formed by arranging a plurality of divided stator cores in an annular shape,
The divided stator core is formed of a powder magnetic material, has a back yoke portion, and a teeth portion that protrudes inward from the back yoke portion to the stator. circumferentially is a joining end face of the stator core segment adjacent cutouts chamfered is provided from the inner peripheral edge of the joint end face triangular cross section toward the outer circumferential side extends in the stator axial direction,
In a state where the plurality of divided stator cores are assembled in an annular shape, the inner peripheral side of the joint end surface is made a non-contact portion by the notch portion, and the length of the non-contact portion in the stator radial direction is the stator of the joint end surface. A stator is provided in which the length is 10% to 30% of the length in the radial direction, and the circumferential dimension of the inner peripheral end of the non-contact portion is 1 mm to 3 mm.
Further, as a second invention, a stator of a motor formed by arranging a plurality of divided stator cores in an annular shape,
The split stator core has a back yoke portion and a teeth portion that protrudes inward from the back yoke portion, and the end surfaces in the radial direction of the stator in the circumferential direction of the back yoke portion are adjacent to each other in the circumferential direction. is a joining end face of the cutout portion chamfered with a triangular cross section toward the outer peripheral side are provided from the inner peripheral edge of the joint end face, cutout portion extends in the stator axial direction, the plurality of split stator cores In the annular shape, the inner peripheral side of the joint end surface is made a non-contact portion by the notch, and the length of the non-contact portion in the stator radial direction is the length of the joint end surface in the stator radial direction. And the circumferential dimension of the inner peripheral end of the non-contact portion is 1 mm to 3 mm, and
The insulating resin coating divided into the teeth portion is externally attached, and the insulating resin coating has a back yoke covering portion protruding from the outer peripheral end of the teeth covering portion in a hook shape, and the inside of the back yoke portion excluding the notch portion. A stator characterized by covering a peripheral surface is provided.

In both the first and second inventions, when the plurality of split stator cores are arranged in an annular shape and the outer periphery of the split stator core is fixed in one piece by pressing inward by shrinking bamelling, the back yoke portion Since the notch part provided from the inner peripheral end of the joining end face toward the outer peripheral side is provided, the inner peripheral end of the joining end face of the adjacent back yoke part does not contact and a gap is generated.
By providing a gap on the inner peripheral end side of the joint end surface of the back yoke where the magnetic flux density locally increases in the contact state, the magnetic flux that has passed through the inner peripheral end side of the joint end surface is dispersed on the outer peripheral side of the joint end surface. In addition, the non-uniformity of magnetic flux in the back yoke part can be eliminated and iron loss can be reduced, and the magnetic flux is not saturated on the inner peripheral end side of the joint end face, so that leakage magnetic flux can be reduced and motor characteristics can be improved. Can do.

As described above, it is preferable that the split stator core of the first invention is made of a dust magnetic material, and the split stator core of the second invention is made of a dust magnetic material or a laminated steel plate.
When the divided stator core is made of a powder magnetic material, it can be easily manufactured by three-dimensional molding, so that workability is good and cost can be reduced. Furthermore, since the split stator core can be finely pulverized when the motor is discarded, the split stator core and the coil can be easily separated, and the recyclability is high.
On the other hand, when the split stator core is composed of laminated steel plates, the laminated steel plates can be manufactured by punching the steel plates, so that they can be manufactured easily and at low cost.

The first, the second split stator windings teeth of split stator core is provided with a coil wound around the formation of the invention, the stator of the motor is formed by annularly arranged,
Since the joining end surfaces of the back yoke portions of the divided stator adjacent in the circumferential direction are joined to each other, and a non-contact portion is provided by the notch portion on the inner circumferential end side of the joining end surface , the coil magnetic flux is joined to the joining stator. it is configured to pass is dispersed in the outer peripheral side of the end face.

  With the above configuration, the inner peripheral end side of the joint end surface of the back yoke portion is a non-contact portion with a gap, and the magnetic flux of the coil is distributed to the outer peripheral side of the joint end surface, so that the magnetic flux in the split stator core is uneven. Can be eliminated and the iron loss can be reduced, and since there is no portion where the magnetic flux density is locally increased, the magnetic flux is not saturated, the leakage magnetic flux can be reduced, and the motor characteristics can be improved.

As described above , the circumferential dimension of the non-contact part is 1 mm to 3 mm, and the radial dimension is 10% to 30% of the radial length of the back yoke part .
By setting the circumferential dimension of the non-contact portion to 1 mm or more, it is difficult for the magnetic flux to pass through the non-contact portion, so that the magnetic flux can be dispersed outside the joint end surface, while the circumferential dimension of the non-contact portion is If it exceeds 3 mm , the magnetic flux does not flow at all in the non-contact portion, and on the contrary, non-uniformity of the magnetic flux occurs.
Further, if the radial dimension is smaller than 10% of the length of the back yoke portion in the radial direction, the magnetic flux is not dispersed to the outer peripheral side. If it is larger than 30%, the strength of the back yoke portion is reduced. Therefore, when the split stator core is arranged in an annular shape and the outer peripheral surface is pressed and fastened by baking bakeling, the back yoke portion may be damaged, and the contact area of the joining end surface becomes too small, so that the magnetic flux The contact portion is saturated and leakage magnetic flux is likely to occur.

As described above, the stator formed by fastening the divided Sutetako A annularly of the invention, the back yoke section of the joining end face in which locally the magnetic flux density in contact with each other joining end face of the back yoke portion is increased By providing a gap formed by the notch on the peripheral end side, the magnetic flux that has passed through the inner peripheral end side of the joining end surface is dispersed on the outer peripheral side of the notch portion, and the uneven magnetic flux in the back yoke is eliminated. The loss can be reduced, and the magnetic flux is not saturated on the inner peripheral end side of the joint end face, so that the leakage magnetic flux can be reduced, and the motor characteristics can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show an embodiment of the present invention.

  The split stator 10 according to the present embodiment includes a split stator core 11, an insulating resin coating 12 that is externally fitted to the split stator core 11, and a tooth portion 11 a of the split stator core 11 via the insulating resin cover 12. And a coil 14 formed by winding a winding. The divided stators 10 are sequentially arranged in an annular shape, and an outer ring 20 for shrinkage is fitted and fixed to the outer peripheral surface to form a stator 30. The stator 30 is arranged around the rotor 40 to constitute a motor 50.

As shown in FIG. 3A, the divided stator core 11 includes a back yoke portion 11b, a tooth portion 11a protruding from the back yoke portion 11b toward the stator center O in the stator radial direction D1, and an inner portion of the tooth portion 11a. The flange portion 11c protrudes from the circumferential end in the stator circumferential direction D2.
End surfaces in the stator radial direction D1 at both ends of the stator circumferential direction D2 of the back yoke portion 11b are joined end surfaces 11d and 11d with the divided stator core 11 adjacent to the stator circumferential direction D2, and the joined end surfaces 11d and 11d are joined to each other. A stator 30 is formed. The back yoke portion 11b and the flange portion 11c have the same height in the stator axial direction D3 as that of the tooth portion 11a.

A notch portion 11g extending in the stator axial direction D3 is provided from the inner peripheral end of both joint end faces 11d, 11d of the back yoke portion 11b toward the outer peripheral side. The notch 11g is formed by chamfering the inner peripheral edge of the joint end surface 11d into a triangular cross section.
The divided stator core 11 is integrally formed by pressurizing and compressing a dust magnetic material and then performing heat treatment. The split stator core 11 may be formed from a steel plate laminate.

As shown in FIG. 4, the insulating resin coating 12 includes a rectangular cylindrical tooth coating 12 a that covers the outer peripheral surface of the tooth 11 a, and a back yoke coating 12 b from the outer peripheral end of the tooth coating 12 a. From the inner peripheral end, a collar covering portion 12c projects in a bowl shape. The back yoke covering portion 12b covers the inner peripheral surface 11h on the side surface of the back yoke portion 11b, but does not cover the notch portion 11g and the joining end surface 11d.
The insulating resin coating 12 has a thickness of 0.2 mm.
In the present embodiment, the insulating resin coating 12 is molded as molded products 12-1 and 12-2 that are divided into two parts along the axis in the stator radial direction D <b> 1, and is externally fitted to the divided stator core 11.
Instead of forming the insulating resin coating 12 separately from the divided stator core 11 and attaching it to the divided stator core 11, the insulating coating layer 12 may be molded to the divided stator core 11 to form an insulating coating layer.

As shown in FIG. 1 and FIG. 6, the stator 30 has the split stator 10 arranged in an annular shape, and an outer ring 20 for shrinkage fitting is fitted on the outer peripheral surface thereof and fastened integrally.
In the divided stator core 11 adjacent to the stator circumferential direction D2, as shown in FIGS. 6A and 6B, the outer peripheral sides of the joint end faces 11d are joined to each other to provide a contact portion 11e, and on the inner peripheral end side. Is provided with a non-contact part 11f formed by a notch part 11g. In the non-contact portion 11f, the magnetic flux B generated by the coil 14 is difficult to pass.
In this embodiment, the dimension L1 in the stator circumferential direction D2 of the non-contact part 11f is 2 mm, and the dimension L2 in the stator radial direction D1 is 1 mm. The dimension L2 of the non-contact part 11f in the stator radial direction D1 is the back yoke part 11b. 10% of the dimension L3 in the stator radial direction D2.

  The outer ring 20 for shrink shrinkage is a metal ring, and the inner peripheral diameter of the outer ring 20 for shrink shrink is smaller than the outer peripheral diameter of the split stator core 11 arranged in an annular shape at room temperature. And it is set as the diameter which can be fitted in the outer periphery of the division | segmentation stator core 11 arrange | positioned in the annular | circular shape in the state expanded by heating.

Next, a method for manufacturing the split stator 10 and the stator 30 will be described.
First, as shown in FIG. 4, the divided stator core 11 is assembled by sandwiching the divided insulating resin coatings 12-1 and 12-2 from both sides. Specifically, the tooth portion 11a is fitted into the tooth covering portion 12a, and the flange covering portion 12c and the back yoke covering portion 12b are covered on the flange portion 11c and the back yoke portion 11b.

  A coil 14 is wound around the tooth portion 11a of the divided stator core 11 covered with the insulating resin coating 12 to obtain a divided stator 10 as shown in FIG.

Next, as shown in FIG. 5A, the divided stator 10 around which the coil 14 is wound is arranged in an annular shape while contacting the joining end surface 11d of the back yoke portion 11b.
Thereafter, the outer ring 20 for shrinking is heated and expanded in advance, and the inner peripheral diameter thereof is made larger than the outer peripheral diameter obtained by connecting the divided stator 10 in an annular shape. In this state, as shown in FIG. The outer ring 20 for shrink shrinkage is fitted on the outer periphery of the split stator 10 connected in an annular shape.

  The outer ring 20 for shrinking shrinkage is reduced in diameter by natural cooling, and the outer ring 20 for shrinking shrinkage is directed toward the stator center O with the outer peripheral surface of the back yoke portion 11b of the divided stator core 11 in the process of reducing the diameter. Press inward. 6A and 6B, the joining end surfaces 11d of the back yoke portion 11b are joined together to form the contact portion 11e. On the inner peripheral end side of the joining end surface 11d after the diameter reduction, The cutout portion 11g forms a gap and becomes a non-contact portion 11f. In this state, the adjacent divided stator cores 11 and the outer ring 20 for shrinkage are integrally fixed to form a stator 30.

  In the stator 30 having the above-described configuration, the magnetic flux B generated by the coil 14 of each split stator 10 passes through both sides on the back yoke portion 11b side and from the contact portions 11e of the joint end surfaces 11d and 11d to the stator circumferential direction D2. Flows to the back yoke portion 11b adjacent to both sides of the. At that time, by providing the non-contact portion 11f on the inner peripheral end side of the joint end surface 11d where the magnetic flux density is locally located at the position corresponding to the path of the magnetic flux, the non-contact portion 11f makes it difficult for the magnetic flux B to pass. Since the magnetic flux B that has passed through the inner peripheral end side of 11d is dispersed in the contact portion 11e, non-uniformity of the magnetic flux density can be eliminated and saturation of the magnetic flux B can be prevented. Therefore, reduction of electric energy, that is, iron loss can be reduced, and motor characteristics can be improved.

Furthermore, when the divided stator core 11 is made of a powder magnetic material, it can be easily manufactured by three-dimensional molding, so that workability is good and cost can be reduced.
In addition, since the insulating resin coating layer formed on the coil winding portion of the divided stator core is formed of a molded product, the insulating resin coating bodies 12-1 and 12-2 are only externally fitted to the divided stator core 11 at necessary locations. Thus, the insulating resin layer can be easily provided.

  The present invention is not limited to the above-described embodiment, and includes various forms within the scope of the claims of the present invention.

It is a perspective view showing a motor, It is a perspective view which shows the division | segmentation stator of this invention, (A) is a perspective view, (B) is a top view. It is a figure which shows the division | segmentation stator core of this invention, (A) is a perspective view, (B) is a top view. It is a perspective view which coat | covers an insulation resin layer on a division | segmentation stator core. It is a figure which shows the manufacturing process of a stator, (A) is a top view of the state which has arrange | positioned the division | segmentation stator in the annular | circular shape, (B) has arrange | positioned the outer ring for shrinkage | fitting on the outer periphery of the division | segmentation stator arrange | positioned in the annular | circular shape. It is a top view which shows a state. It is a figure which shows the manufacturing process of a stator, (A) is a top view which shows the state which fitted the outer ring for shrinkage to the outer periphery of the division | segmentation stator arrange | positioned circularly, (B) is the principal part of (A). FIG. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Split stator 11 Split stator core 11a Teeth part 11b Back yoke part 11d Joining end surface 11f Non-contact part 11g Notch part 12 Insulation resin coating 14 Coil 20 Shrinking outer ring 30 Stator 50 Motor D1 Stator radial direction D2 Stator circumferential direction D3 Stator axial direction B Coil flux

Claims (4)

A stator of a motor formed by arranging a plurality of divided stator cores in an annular shape,
The divided stator core is formed of a powder magnetic material, has a back yoke portion, and a teeth portion that protrudes inward from the back yoke portion to the stator. circumferentially is a joining end face of the stator core segment adjacent cutouts chamfered is provided from the inner peripheral edge of the joint end face triangular cross section toward the outer circumferential side extends in the stator axial direction,
In a state where the plurality of divided stator cores are assembled in an annular shape, the inner peripheral side of the joint end surface is made a non-contact portion by the notch portion, and the length of the non-contact portion in the stator radial direction is the stator of the joint end surface. A stator having a radial length of 10% to 30% and a circumferential dimension of an inner peripheral end of the non-contact portion of 1 to 3 mm. A stator of a motor formed by arranging a plurality of divided stator cores in an annular shape,
The split stator core has a back yoke portion and a teeth portion that protrudes inward from the back yoke portion, and the end surfaces in the radial direction of the stator in the circumferential direction of the back yoke portion are adjacent to each other in the circumferential direction. is a joining end face of the cutout portion chamfered with a triangular cross section toward the outer peripheral side are provided from the inner peripheral edge of the joint end face, cutout portion extends in the stator axial direction, the plurality of split stator cores In the annular shape, the inner peripheral side of the joint end surface is made a non-contact portion by the notch, and the length of the non-contact portion in the stator radial direction is the length of the joint end surface in the stator radial direction. And the circumferential dimension of the inner peripheral end of the non-contact portion is 1 mm to 3 mm, and
The insulating resin coating divided into the teeth portion is externally attached, and the insulating resin coating has a back yoke covering portion protruding from the outer peripheral end of the teeth covering portion in a hook shape, and the inside of the back yoke portion excluding the notch portion. A stator characterized by covering a peripheral surface.   The stator according to claim 2, wherein the divided stator core is formed of a powder magnetic material or a laminated steel plate.   The stator according to claim 2 or 3, wherein a coil is formed by winding a winding around the insulating resin coating of the tooth portion.

Images