JP2001197689A - Stator of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient motor, having a high space factor by securing a magnetic path width between the bottom of recesses for winding and the outer edge of an iron core of a stator and alignedly winding a wire. SOLUTION: The iron core 21 of the stator is formed with cutouts or flat parts in the outer edge part. On the lines connecting the center of rotation of a rotor and parts of the cutouts or flat parts, which are closest to the center of rotation of the rotor, salient poles of nearly the same width are formed. The shape of a bottom part of each recess for winding comprises lines crossing at right angles with the salient poles on both sides and a circular arc centering around the center of rotation of the rotor or line crossing, at right angles with the line connecting the center of rotation of the rotor and the center of the bottom part of the recess 23, which forms a central part of the shape of the bottom part of the recess 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator having a high space factor and improved efficiency by applying an alignment winding.

[0002]

2. Description of the Related Art Conventionally, in a motor stator having salient poles with concentrated windings, the shape of the bottom of a winding groove is generally an arc centered on the rotation center of the rotor. there were. However, in such a configuration, it is extremely difficult to align and wind the windings, so that the motor has a low winding space factor and is inefficient. For this reason, for example, Japanese Patent Application No.
As described in Japanese Patent Publication No. 235284, a stator core is divided into salient poles to form a winding, and then the salient poles are combined to form a stator. A motor has been proposed which realizes a high space factor by making it possible to apply an alignment winding to each salient pole as a plane orthogonal to each salient pole.

FIG. 5 is a radial sectional view of a stator core and a rotor described in Japanese Patent Application No. 10-235284. The stator piece 2 has teeth (salient pole portions) 11 and a yoke 14 integrally formed, and the teeth 11 are arc-shaped pole portions facing the rotor and pillar portions extending toward the outer diameter direction. The yoke 14 is arranged orthogonal to the column and has connecting portions at both ends for connecting the yokes to each other. Windings (not shown) are wound around the pillars of the teeth 11 via an electrical insulator. At this time, the side surface of the tooth 11 and the winding-side bottom surface of the yoke 14 are orthogonal to each other, so that the aligned winding can be easily performed and the winding with a high space factor can be performed. Thereafter, the annular stator is assembled by connecting to each other by using connecting portions provided at both ends of the yoke 14.

[0004]

However, in the above-described conventional configuration, the stator core is divided into stator pieces, and the loss is caused by a minute gap existing at the joint between the stator pieces. And the strength of the iron core also decreases.

[0005] Further, since the bottom of the winding groove is formed of a line perpendicular to the salient poles on both sides, and the outer shape of the stator core is an arc shape centered on the rotor center, the stator core near both ends of the yoke is provided. The width of the magnetic path formed between the outer shape and the bottom of the groove for winding is narrowed, causing saturation of magnetic flux.
In addition, in order to reduce the magnetic flux saturation, the magnetic path between the bottom of the winding groove at the center of the yoke and the outer shape of the stator core becomes larger than necessary, and as a result, the area of the winding groove becomes sufficiently large. Had been prevented.

The present invention solves the above-mentioned problems, secures a magnetic path width between the bottom of the winding groove and the outer diameter of the stator core, and has a high space factor and a high efficiency by using the aligned winding. An electric motor is provided.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a notch or a flat portion in an outer diameter portion of a stator core, and the notch or the flat portion has a notch or a flat portion. On the line connecting the point with the shortest distance and the rotation center of the rotor, salient poles of approximately equal width are provided, and the shape of the bottom of the winding groove is perpendicular to the salient poles on both sides. Near the center of the bottom of the groove for the motor, characterized in that it comprises an arc centered on the center of rotation of the rotor or a line perpendicular to the line connecting the center of rotation of the rotor and the center of the bottom of the winding groove It is a stator.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application is an adduction type electric motor having a plurality of salient poles and winding grooves at substantially equal intervals on the inner diameter side of a substantially cylindrical stator core. From the opening of the winding groove on the inner diameter side, winding is applied to the salient pole via an insulator, and the outer diameter portion of the stator core has a notch or flat portion, and the notch or A salient pole of approximately equal width is provided on a line connecting the point of the flat part, which is the shortest distance from the rotation center of the rotor, and the rotation center of the rotor, and the bottom shape of the winding groove is such that the protrusions on both sides are A line orthogonal to the poles and a line near the center of the bottom of the groove for winding near the center of rotation of the rotor or an arc or a line connecting the center of rotation of the rotor with the center of bottom of the winding groove for rotation. A stator for an electric motor characterized by the fact that the space factor can be increased, and the outer shape of the stator core and Since the magnetic path width formed between the parts can be sufficiently secured, it is possible to provide a highly efficient electric motor.

According to the second aspect of the present invention, the magnetic path width of the stator iron core formed between the outer shape and the bottom of the winding groove is
2. The stator of an electric motor according to claim 1, wherein the stator has a width equal to or more than one-half of the salient pole width and has a substantially equal width except for the hole. Since the width of the magnetic path formed between the coil and the bottom of the winding groove can be sufficiently ensured, a highly efficient electric motor can be provided.

According to the third aspect of the present invention, an insulator having a substantially equal thickness is provided along the outer peripheral portion of the winding groove, and a portion where the salient pole and the bottom are orthogonal to each other inside the insulator, and 3. The stator for an electric motor according to claim 1, wherein a portion where the pole intersects with the widened portion at the tip on the inner diameter side of the salient pole is rounded with an arc not larger than the radius of the winding. As a result, a high space factor can be achieved, and a highly efficient electric motor can be provided.

According to the invention described in claim 4 of the present application, an insulator having a substantially equal thickness is provided along the outer peripheral portion of the winding groove. 3. A step or groove for fixing the winding position at a portion where the pole and the widened portion at the inner diameter side end of the salient pole intersect.
It is a stator of the electric motor described, which can provide a high space factor and can provide an electric motor with high efficiency.

The invention according to claim 5 of the present application is characterized in that the number of rotor poles is 4, the number of winding grooves of the stator is 6, and each salient pole is provided with a concentrated winding. The motor stator according to any one of claims 1 to 4, wherein the motor has a good balance of losses and high efficiency.

Here, the outer peripheral portion of the winding groove means the bottom of the winding groove and both sides of the salient pole and the widening portion on the inner diameter side of the salient pole. Shall not be included.

The flat portion and the notch portion are portions smaller than the outermost diameter of the stator core, and the portion of the stator core smaller than the outermost diameter of the outer periphery of the stator core is a notch portion and the stator core. The portion cut out linearly from the outermost diameter of the outer periphery of the stator core is referred to as a flat portion.

(Embodiment 1) A first embodiment of the present invention will be described in detail with reference to FIG.

FIG. 1 is a sectional view of a stator core according to the first embodiment of the present invention.

A plurality of salient poles 22 and winding grooves 23 are provided on the inner diameter side of the substantially cylindrical stator core 21 at substantially equal intervals, and the salient poles 22 are formed through the openings 24 of the inner diameter winding grooves. Is a 4-pole, 6-slot electric motor in which a winding (not shown) is applied through an insulator (not shown).

The flat portion 25 is formed on the outer diameter of the stator core 21.
a, 25b, 25c, and a salient pole 22 having a substantially equal width T1 is formed on a line connecting the point Po of the flat portion, which is the shortest distance from the rotation center of the rotor, to the rotation center O of the rotor. Is provided.

In this embodiment, the flat portions 25a, 25b, and 25c have three different sizes, and are not equal to the pitch of the salient poles.
The point Po, which is the shortest distance from the rotation center of the rotor,
A salient pole 22 having a substantially equal width T1 is provided on a line connecting the rotation center O of the rotor. If the flat part or notch is
When the pitch is equal to the pitch of the salient poles, the salient poles having substantially the same width are drawn on a line connecting the point where the distance between the flat portion or the notch and the center of rotation of the rotor is the smallest and the center of rotation O of the rotor. Can be provided.

The shape of the bottom of the winding groove 23 is such that lines 26a and 26b perpendicular to the salient poles on both sides and the center of rotation of the rotor O and the vicinity of the center of the bottom of the winding groove 23, respectively. It consists of a line connecting the bottom center Ps and a line 26c perpendicular to the line.

The largest flat portion 25a provided on the outer diameter of the stator core 21 and the bottom of the winding groove at a position facing the flat portion 25a are parallel to each other and have a magnetic path of width Y2. Is formed. The smallest flat portion 25c is parallel to the bottom of the winding groove at a position facing the flat portion 25c, and a magnetic path having a width Y1 is formed. In addition, 2
A mounting through hole 27 is provided between the second largest flat portion 25b and the bottom of the winding groove at a position facing the flat portion 25b, and has a width Y3 excluding the mounting through hole 27. A magnetic path is formed. These magnetic path widths Y1,
Y2 and Y3 are almost the same as one half or more of the width T1 of the salient pole, that is, the magnetic path width of the stator core formed between the outer shape of the stator core and the bottom of the winding groove is smaller. In the case of having a hole, except for the hole, the width of the salient pole is at least half, preferably at least two-thirds, so that the width is substantially equal. Normally, the magnetic flux of the permanent magnet of the rotor is
According to the diagram showing the flow of the magnetic flux, the magnetic flux passes through one salient pole 22, is divided into left and right magnetic paths, and goes to different salient poles. Therefore, the amount of magnetic flux of the magnetic path of the stator core formed between the outer shape of the stator core and the bottom of the winding groove is one half of the amount of magnetic flux of the salient pole.
From this, the configuration has no magnetic flux saturation and a low iron loss.

Further, since the winding grooves are substantially equally spaced and have substantially the same shape, the winding property is good. Therefore,
Even when the stator core is not divided but wound as a single body, aligned high-density winding is possible.

With regard to the number of poles, considering a higher efficiency, a smaller pole is advantageous because the driving power supply frequency is smaller, so that iron loss can be reduced, but with two poles, the electromagnetic force is biased in one direction. Because it rotates, vibration is likely to occur. Therefore, the four poles where the electromagnetic force is balanced at the 180 ° symmetrical position are optimal, and at this time, if three-phase winding is applied, six slots are optimal.

(Embodiment 2) A second embodiment of the present invention will be described in detail with reference to FIG.

FIG. 3 is an enlarged sectional view of the stator according to the second embodiment of the present invention. About the winding, for convenience,
Some have been omitted.

Since the stator core 21 is the same as that of the first embodiment, the description of the structure and operation will be omitted. On the outer periphery of the winding groove 23, there is an insulator 32 having a substantially equal thickness in a form almost in contact with the core 21. In the salient pole part 22,
A winding 33 is provided via an insulator 32. At the portion 32a where the salient pole and the bottom are orthogonal to each other and at the portion 32b where the salient pole and the widened portion at the inner diameter end of the salient pole intersect, the portions are rounded with arcs R1 and R2 smaller than the radius Rc of the winding. It is characterized by having been done. If the insulator 32 is made of resin or the like, the arcs R1 and R2 are
Rc may be smaller than Rc. However, if the film or paper is bent, the winding groove 2 of the stator core may be used.
3, the arc radius of the portion 31a where the salient pole and the bottom are orthogonal to each other and the portion 31b where the salient pole intersects with the widened portion at the inner end of the salient pole are less than Rc + Ti, where the thickness of the insulator is Ti. I just need. With this configuration, it is possible to align and apply windings at a portion 32a where the salient pole and the bottom are orthogonal to each other and at a portion 32b where the salient pole and the widened portion at the inner diameter side end of the salient pole intersect. It is possible, and the space factor can be improved.

For example, when winding is started from the winding 33s, the last winding 33e in the first one row can be wound without deviating from the row, and the second and subsequent rows can be maintained in alignment. Winding is possible.

As shown in FIG. 4, a portion 42 where the salient pole inside the insulator intersects with the widened portion at the tip on the inner diameter side of the salient pole.
In b, a step or groove for fixing the winding position may be provided. With this configuration, a high space factor winding can be achieved without disturbing the winding alignment during winding. In particular, in order to prevent magnetic saturation and ensure a smooth flow of magnetic flux, of the outer peripheral portion of the winding groove, a portion 41a where the salient pole and the bottom are orthogonal to each other or a widened portion at the inner diameter side tip of the salient pole and the salient pole. In the case where a large arc is taken at the intersecting portion 41b,
This enables a high space factor winding.

When the above configuration is adopted for a certain motor,
When the iron loss is equal, the slot area is improved by about 10% and the space factor is improved by about 5%.

[0030]

As is apparent from the above description, according to the first aspect of the present invention, it is possible to sufficiently secure a magnetic path width formed between the outer shape of the stator core and the bottom of the winding groove. Therefore, a highly efficient electric motor can be provided.

According to the invention described in claim 2 of the present application, it is possible to sufficiently secure a magnetic path width formed between the outer shape of the stator core and the bottom of the winding groove, thereby providing a highly efficient motor. Can be.

According to the third aspect of the present invention, a high space factor can be achieved, and a highly efficient electric motor can be provided.

According to the invention described in claim 4 of the present application, a high space factor can be achieved, and a motor with high efficiency can be provided.

According to the invention described in claim 5 of the present application, it is possible to provide a motor with a good balance of losses and high efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stator core according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a flow of magnetic flux inside a stator core according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a stator according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of another stator according to the second embodiment of the present invention.

FIG. 5 is a sectional view of a conventional stator core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Stator iron core 22 Salient pole part 23 Winding groove 24 Opening 25a, 25b, 25c Flat part 26a, 26b, 26c Bottom part of winding groove 27 Through hole

Continuing on the front page (72) Inventor Ikugo Seki 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Reference) 5H002 AA09 AB06 AE08 5H604 BB01 BB14 CC01 CC05 CC11 CC13 CC16

Claims (5)

[Claims] 1. An adduction motor having a plurality of salient poles and winding grooves at substantially equal intervals on the inner diameter side of a substantially cylindrical stator core, wherein the inner rotation type motor has an opening formed in the inner diameter side winding groove. A winding is applied to the salient pole via an insulator, and an outer diameter portion of the stator core has a notch or a flat portion, and the notch or the flat portion has
A salient pole of approximately equal width is provided on a line connecting the point at the shortest distance from the rotation center of the rotor and the rotation center of the rotor, and the bottom shape of the winding groove is orthogonal to the salient poles on both sides. And a line in the vicinity of the bottom center of the winding groove, which is orthogonal to the line connecting the rotation center of the rotor or the rotation center of the rotor and the bottom center of the winding groove near the center of rotation of the rotor. Motor stator characterized by the following. 2. The stator core formed between the outer shape of the stator core and the bottom of the winding groove has a magnetic path width of two minutes of the salient pole width, excluding the case where the stator core has holes. 3. The stator for an electric motor according to claim 1, wherein the at least one width is substantially equal. 3. An insulator having substantially the same thickness is provided along the outer peripheral portion of the winding groove, and a portion of the insulator, in which the salient pole and the bottom are orthogonal to each other, and an inner diameter side tip of the salient pole and the salient pole. 3. The stator of the electric motor according to claim 1, wherein a portion intersecting with the widened portion is rounded with an arc smaller than a radius of the winding. 4. 4. An insulator having a substantially equal thickness is provided along the outer peripheral portion of the winding groove, and a portion of the insulator where the salient pole and the bottom are orthogonal to each other, and a tip of the salient pole and the salient pole on the inner diameter side. 3. The stator for an electric motor according to claim 1, further comprising a step or a groove for fixing a winding position at a portion intersecting with the widened portion. 5. The method according to claim 1, wherein the number of rotor poles is four, the number of stator winding grooves is six, and each salient pole is provided with a concentrated winding. 4. The stator of the electric motor according to 4.