JP2006340507A - Stator of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the stator of a rotary electric machine in which increase in loss or degradation in efficiency due to caulking can be minimized. <P>SOLUTION: In a rotary electric machine comprising a rotor rotating in a predetermined direction and arranged internally, and a stator having a stator core 1 composed of substantially tubular laminated steel plates having a plurality of salient poles projecting inward, recesses are provided in the stator core in the laminating direction and fitted in the laminating direction and caulked. The caulking portion 4 is provided at the teeth 2 of the stator core and the center of the caulking portion 4 at the teeth 2 exists in a portion 7 on the side farther in the rotational direction 8 of the rotor than the center line 5 of the teeth and surrounded by a line 6 drawn from the anti-rotational direction side at the distal end of teeth to the root of teeth on the rotational direction side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary electric machine such as a motor used in a compressor, and more particularly to a stator of a rotary electric machine designed to achieve a small size, high output density, and high efficiency.

  In a rotating electrical machine having a rotor that is rotatable on the inside and having a stator sandwiched on the outside of the rotor, the iron core of the stator is caused by the magnetic flux generated by the rotor magnetomotive force or stator winding magnetomotive force, It is composed of electromagnetic steel sheets laminated in the axial direction for the purpose of reducing iron loss generated in the stator core. In order to fix the laminated steel sheet in the axial direction, the laminated steel sheet is fixed by providing a recess in the in-plane direction and fitting the laminated steel sheets between the stacked layers (hereinafter referred to as caulking).

  In addition, in rotating electrical machines that use permanent magnets for the rotor magnetomotive force, progress has been made in machining methods such as using iron cores that are divided in the circumferential direction and connecting them in the circumferential direction for the purpose of reducing the machining cost of the stator. is doing. For this reason, stator laminated iron cores using the above caulking are widely used.

  However, it is known that the stator laminated iron core using the above caulking deteriorates the magnetic characteristics and iron loss characteristics of the iron core due to caulking, and the iron loss due to the magnetic flux passing through the caulking portion increases. Further, when the magnetization characteristics of the caulking portion are deteriorated, the magnetic flux density around the caulking portion is increased, and the iron loss is also increased (see, for example, Patent Document 1).

  Furthermore, in the caulking portion, there is a possibility that the layers of the laminated steel sheets may be short-circuited. If two or more interlayer short-circuits occur in the caulking portion, an eddy current is generated in this portion and loss occurs.

JP 2001-258225 A

  As described above, caulking is required to fix the laminated iron core in the laminating direction, but loss increases due to deterioration of the magnetization characteristics and iron loss characteristics due to caulking, and short-circuit conduction between the laminated layers in the caulking. There was a problem that the efficiency of the electric machine deteriorated.

  The present invention has been made to solve the above-described problems.Although fixing in the stacking direction is performed by caulking, by changing the caulking position used conventionally, an increase in loss due to caulking and efficiency can be improved. The present invention provides a stator for a rotating electrical machine in which the reduction is as small as possible.

  In the stator of the rotating electrical machine according to the present invention, the stator core is composed of a substantially cylindrical laminated steel plate in which a rotor rotating in a certain direction is disposed and a plurality of convex poles projecting inward are formed. The stator includes a stator having a concave portion in the stacking direction in the stator core and is fixed by caulking by fitting the concave portion in the stacking direction. It is provided, and the center of the tooth caulking part is located on the rotor rotation direction side of the tooth center line, and is a line drawn from the counter rotation direction side of the tooth tip to the tooth root part on the rotation direction side. It is made to exist in the part surrounded by.

  According to the present invention, it is possible to reduce the rate at which the iron loss characteristics deteriorate due to the caulking of the stator core, and to provide a highly efficient rotating electrical machine.

Embodiment 1 FIG.
1 is a schematic diagram showing a stator core tooth portion of a stator of a rotating electric machine according to Embodiment 1 of the present invention, and FIG. 2 shows a stator core tooth portion of the stator of the rotating electric machine according to Embodiment 1 of the present invention. It is a figure which shows magnetic flux distribution typically.
FIG. 1 schematically shows one tooth portion 2 and a core back portion 3 of the stator core 1.
Although not shown, the rotating electrical machine has a stator core that is composed of a substantially cylindrical laminated steel sheet in which a plurality of projecting poles projecting inward are formed, and a rotor that rotates in a certain direction is disposed inside. Is provided with a concave portion in the stacking direction in the stator core, and caulked and fixed by fitting the concave portion in the stacking direction. Here, the center position of the caulking portion 4 of the tooth portion 2 is on the rotation direction side as seen from the rotation direction 8 of the rotor from the tooth portion center line 5 passing through the center of the tooth portion 2 in the circumferential direction, and It exists on the inner diameter side from the line 6 drawn from the counter rotation direction side of the tip of the tooth portion 2 to the tooth root angle A on the rotation direction side. If there is no tooth base angle A on the rotation direction side, a tangent drawn from the counter-rotation direction side of the tip of the tooth portion 2 to the tooth root portion may be used. That is, the center of the caulking portion 4 of the tooth portion 2 exists in the polygon ABCD shown in FIG. B is the tip of the tooth portion 2 on the rotational direction side, C is the tip of the tooth portion 2 on the tooth center line 5, and D is the intersection of the tooth center line 5 and the line 6.

The principle that the iron loss can be reduced when the center of the caulking portion 4 of the tooth portion 2 exists in the polygon ABCD will be described with reference to FIG.
In order for the rotating electric machine to rotate, the rotor N pole made by the rotor and the stator S pole made by the stator are shifted in the direction of the rotation direction 8 of the rotor. As a result, the rotor N pole of the rotor and the stator S pole of the stator are magnetically attracted and become a rotational force. Therefore, the magnetic flux 11 in which the stator forms the stator S pole is parallel to the tooth center line 5 of the stator core 1 as shown in FIG.

  The magnetic flux generated by the rotor's rotor N pole flows in the air gap according to the direction 24 directed to the stator S pole, and then returns to the rotor S pole in a direction indicated by 25 and 26 through a certain path. To do. That is, in the stator core 1, the magnetic flux 21 flows toward the tooth portion 2 in the counter-rotating direction, the magnetic flux 22 flows toward the tooth portion 2 in the rotating direction, and the magnetic flux 23 leaking at the tooth portion 2.

  In the tooth portion 2 of the stator core 1, the total of the magnetic flux 11 produced by the stator and the magnetic fluxes 21, 22, and 23 produced by the rotor. Here, when the sum of the stator magnetic flux 11 and the rotor magnetic flux 21 is considered, it can be seen that the counter-rotation direction side of the stator tooth portion 2 is magnetized and the magnetic flux density is increased. Considering the sum of the stator magnetic flux 11 and the rotor magnetic flux 22, a line drawn from the counter-rotation direction side of the tip of the tooth portion 2 to the teeth root angle on the rotation direction side (if there is no tooth root angle, a tangent drawn to the teeth root portion) ) It can be seen that the outer diameter is increased from 6, and the magnetic flux density is increased. Considering the sum of the stator magnetic flux 11 and the rotor magnetic flux 23, it can be seen that the magnetization is increased on the counter-rotation direction side from the tooth center line 5 of the stator core 1 and demagnetized on the rotation direction side.

  If caulking is installed, the magnetization characteristics and iron loss characteristics deteriorate, and the higher the magnetic flux density, the higher the iron loss. It can be said that installation is not desirable. Therefore, the caulking portion 4 of the tooth portion 2 is installed in the shaded portion 7 in FIG. 2 (inside the polygon ABCD in FIG. 1) where the magnetizing by the stator magnetic flux 11 and the rotor magnetic fluxes 21, 22 and 23 is relatively small. It can be seen that this is very effective in reducing iron loss.

  Further, when the caulking portion 4 of the tooth portion 2 is provided in the portion surrounded by the polygon ABCD in FIG. 1, the magnetic flux density is reduced even if the side surfaces of the caulking are short-circuited between the laminations. There is also an effect that the eddy current due to the short circuit is considerably smaller than that generated in the portion where the magnetic flux density is high outside the polygon ABCD.

Embodiment 2. FIG.
FIG. 3 is a schematic diagram showing a stator core tooth portion of a stator of a rotating electric machine according to Embodiment 2 of the present invention, and FIG. 4 shows a stator core tooth portion of the stator of the rotating electric machine according to Embodiment 2 of the present invention. It is a figure which shows magnetic flux distribution typically.
FIG. 3 schematically shows one tooth portion 2 and the core back portion 3 of the stator core 1. Here, the center position of the caulking portion 9 of the core back portion is inside the extension line 10 on both side surfaces of the stator tooth portion 2, and the tooth base angle A on the rotational direction side used in the description of the first embodiment. Teeth root angle point E (point that is symmetrical to point A) on the outside of the quarter circle having a radius of a distance 32 between the point and the center line 5 of the stator tooth portion 2 and the counter-rotating direction side It exists in the outer side of 1/4 circle which makes radius the distance 32 between the centerline 5 of the stator tooth | gear part 2, respectively. That is, the center of the caulking portion 9 of the core back portion 3 exists in the shaded portion 31 in FIG.

The principle that the iron loss can be reduced when the center of the caulking portion 9 of the core back portion 3 exists in the shaded portion 31 in FIG. 3 will be described with reference to FIG.
As described with reference to FIG. 2, during operation of the rotating electrical machine, the total of the stator magnetic flux and the rotor magnetic flux is generated in the stator core. When the magnetic flux generated by the stator flows from the stator tooth portion 2 toward the stator core back portion 3, the magnetic flux is diverted in the direction indicated by 41 in the figure. The magnetic flux generated by the rotor flows in the direction indicated by 42 in the figure as shown in FIG. However, this is when the rotation direction of the rotor is the direction indicated by 8 in the figure. When the rotor rotates in the reverse direction, the left and right of the magnetic flux 42 created by the rotor are switched.

  From FIG. 4, it can be easily estimated that the portion where the magnetic flux density is reduced in the core back portion 3 is within the range of the shaded portion 31 in FIG. Therefore, if the center of the caulking 9 of the core back part 3 is installed in the shaded portion 31, an increase in iron loss due to caulking is suppressed, and a highly efficient rotating electrical machine can be provided.

Embodiment 3 FIG.
In order to improve the workability of the stator core, in the case of a stator of a rotating electric machine constituted by a plurality of divided iron cores, instead of working the entire circumference of the stator with an integral iron core, In order to adhere, it is necessary to use a lot of caulking in the tooth portion and the core back portion. For this reason, an increase in iron loss and a decrease in efficiency due to caulking become more remarkable.
5 is a schematic diagram showing a split stator core of a stator of a rotating electrical machine according to Embodiment 3 of the present invention.

  Each split stator core 1 of the rotating electrical machine according to FIG. 5 has the caulking portion 4 of the stator tooth portion 2 installed in the same manner as in the first embodiment, and the caulking portion 9 of the core back portion 3 It is installed in the same manner as in the second embodiment. In addition, each tooth | gear part is isolate | separated by dividing | segmenting the core back part 3 by the line 50 from a slot bottom to an iron core outer diameter, for example.

  Of course, this split stator core is also the same in a thin meat connection shape in which only a part is connected.

  The same effect can be obtained even with a linear motor instead of a rotating electrical machine.

It is a schematic diagram which shows the stator core tooth part of the stator of the rotary electric machine in Embodiment 1 of this invention. It is a figure which shows typically magnetic flux distribution of the stator core tooth part of the stator of the rotary electric machine in Embodiment 1 of this invention. It is a schematic diagram which shows the stator core tooth part of the stator of the rotary electric machine in Embodiment 2 of this invention. It is a figure which shows typically the magnetic flux distribution of the stator core tooth part of the stator of the rotary electric machine in Embodiment 2 of this invention. It is a schematic diagram which shows the split stator core of the stator of the rotary electric machine in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator iron core 2 Stator tooth part 3 Stator core back part 4 Tooth caulking part 5 Tooth center line 6 Line or tangent 7, 31 Shaded part 8 Rotating direction 9 Core back caulking part

Claims (3)

A rotating electrical machine including a stator having a stator core, which is configured by a substantially cylindrical laminated steel plate, in which a rotor rotating in a certain direction is disposed inside and a plurality of projecting poles projecting inward are formed. The stator core is provided with a recess in the stacking direction, and fixed by caulking by fitting the recess in the stacking direction.
The caulking portion is provided on a tooth portion of the stator iron core, the center of the tooth caulking portion is located on the rotation direction side of the rotor with respect to the center line of the tooth portion, and is opposite to the tip of the tooth portion. A stator of a rotating electrical machine, wherein the stator is present in a portion surrounded by a line drawn from a rotation direction side to a tooth root portion on the rotation direction side. A rotating electrical machine comprising a stator having a stator core formed of a substantially cylindrical laminated steel plate having a rotor disposed therein and formed with a plurality of convex poles protruding inward, the stator core In the stator that is provided with a recess in the stacking direction, and that is caulked and fixed by fitting the recess in the stacking direction,
The caulking portion is provided in the core back portion of the stator core, the center of the caulking portion of the core back portion is inside the extension line on both side surfaces of the stator tooth portion, and the teeth on the rotational direction side The radius is the outer part of the circle whose radius is the distance between the root and the center line of the stator teeth, and the distance between the teeth root on the counter-rotating direction side and the center line of the stator teeth. A stator for a rotating electric machine, wherein the stator is present on each of outer portions of a circle. The stator of a rotating electrical machine according to claim 1 or 2, wherein the stator core is a split stator core.

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