JP5916569B2 - Rotating electric machine stator and rotating electric machine - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine and a rotating electrical machine with high efficiency, reliability, and high productivity.

In general, a rotating electrical machine is composed of a stator and a rotor including a stator core and a frame.
The stator iron core is formed by laminating iron core pieces obtained by punching electromagnetic steel sheet sheets with a press die and fixing the laminations by punching or welding.
The stator core is composed of a back yoke and teeth.
Conventionally, in order to reduce the stress acting on the stator core, as a method of fixing the stator core other than shrink fitting or press fitting, there is a method in which a resin is filled in the gap between the stator core and the frame and bonded. (For example, see Patent Document 1)
In Patent Document 1, in order to increase the fixing strength between the stator core and the frame, a structure is proposed in which a groove is provided in the outer peripheral portion of the stator core and a pin is inserted from the outer peripheral side of the frame.

JP 2011-30303 A

However, in the rotating electrical machine described in Patent Document 1, when the stator core and the frame are joined with a resin material, the gap between the stator core and the frame is narrow, so, for example, when a high viscosity adhesive is injected, The adhesive is hardened before being filled in the gap, so that the adhesive layer is not sufficiently formed.
There was a problem that the fixing strength between the stator core and the frame could not be sufficiently obtained, and a fixing pin was required for reinforcement, which increased the number of manufacturing steps and the number of parts.

  The present invention has been made to solve the above-described problems, and by firmly fixing the stator core and the frame, the reliability of the rotating electrical machine and the reliability of the rotating electrical machine can be improved, and the stator The purpose is to improve heat dissipation by improving the heat transfer coefficient between the iron core and the frame, and to further increase the productivity of the rotating electrical machine.

The stator of the rotating electrical machine according to the present invention is:
A stator core having an annular back yoke and a plurality of teeth arranged to protrude from the back yoke to the inner peripheral side;
A coil that is insulated and wound around the stator core in a slot formed between adjacent teeth of the stator core;
In a stator of a rotating electrical machine comprising a cylindrical frame that houses the stator core inside,
Wherein the outer peripheral surface of the stator core, having an adhesive injection recess extending in the axial direction of the stator, said stator core and said frame is adhesively bonded,
The stator core is configured by laminating a plurality of core pieces each having a core piece recess recessed in the radially inner direction of the stator core on the outer peripheral surface,
The laminated iron core piece recesses form the adhesive injection recesses,
A first core piece having a first recess as the core piece recess on an outer peripheral surface of the core piece, and a second core piece having a second recess having a shape different from the first recess as the core piece recess. The first core pieces and the second core pieces are alternately laminated in a predetermined number .

The stator of the rotating electrical machine according to the present invention is:
Wherein the outer peripheral surface of the stator core, having an adhesive injection recess extending in the axial direction of the stator, said stator core and said frame is adhesively bonded,
The stator core is configured by laminating a plurality of core pieces each having a core piece recess recessed in the radially inner direction of the stator core on the outer peripheral surface,
The laminated core piece recesses form the adhesive injection recesses,
A first core piece having a first recess as the core piece recess on an outer peripheral surface of the core piece, and a second core piece having a second recess having a shape different from the first recess as the core piece recess. Since a predetermined number of the first core pieces and the second core pieces are alternately stacked , the stator of the rotating electrical machine having high efficiency and high reliability and productivity can be obtained. Can do.
In addition, the adhesive layer between the stator core and the frame is formed with a convex portion that protrudes in a direction perpendicular to the rotational direction of the rotating electrical machine. can do.

It is sectional drawing of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view of the stator core which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state just before fitting the stator iron core and frame which concern on Embodiment 1 of this invention. It is sectional drawing of the stator which fitted together the stator core and frame which concern on Embodiment 1 of this invention. It is a perspective view of the stator core which concerns on Embodiment 2 of this invention. It is a top view of the core piece which comprises the stator core which concerns on Embodiment 2 of this invention. It is a perspective view of the stator which concerns on Embodiment 3 of this invention. It is sectional drawing of the stator which concerns on Embodiment 3 of this invention. It is a perspective view of the stator core which concerns on Embodiment 4 of this invention. It is sectional drawing of the stator which concerns on Embodiment 5 of this invention. It is sectional drawing of the stator which concerns on Embodiment 6 of this invention. It is sectional drawing of the stator which concerns on Embodiment 7 of this invention.

Embodiment 1 FIG.
Hereinafter, a stator and a rotating electrical machine of a rotating electrical machine according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the rotating electrical machine 100.
A distributed winding type three-phase induction motor is shown.

As shown in FIG. 1, the rotating electrical machine 100 includes a stator 1 mainly including a stator core 11 and a frame 12, and a rotor 2.
The frame 12 has a cylindrical shape and has a space for accommodating the stator core 11 therein.
The material of the frame 12 is a metal material such as steel, cast iron, or aluminum.
When the steel plate frame 12 is employed, the steel plate is bent into a cylindrical shape so as to form an area for housing the stator core 11.
The joint is joined by welding or the like to form the frame 12 in a cylindrical shape.
When the aluminum or cast iron frame 12 is employed, the frame 12 is formed in a cylindrical shape by cutting a region in which the stator core 11 is accommodated.

The fit between the stator core 11 and the frame 12 employs a clearance fit.
Therefore, the inner diameter of the frame 12 is 0.5 to 1 mm larger than the outer diameter of the stator core 11.
In addition, the rotor 2 including the rotor core 21 and the shaft 22 is accommodated in a space on the inner peripheral side of the teeth 13 of the stator core 11.
As with the stator core 11, the rotor core 21 of the rotor 2 is laminated with electromagnetic steel plates and has a copper or aluminum coil (not shown in FIG. 1).
The coil is electrically insulated from the stator core.

FIG. 2 is a perspective view of the stator core 11.
The stator iron core 11 is formed by laminating iron core pieces 15 punched out from a magnetic steel sheet having a thickness of 0.35 to 0.5 mm in the direction of the rotation axis of the rotating electrical machine 100.
One iron core piece 15 includes a back yoke portion 15a and a teeth portion 15b.
A portion where the back yoke portion 15 a of the core piece 15 is laminated becomes an annular back yoke 16, and a portion where the teeth portion 15 b is laminated becomes a tooth 13 protruding from the back yoke 16 toward the inner peripheral side.

A slot 14 is formed between adjacent teeth 13 of the stator core 11.
Although not shown in FIG. 2, a coil is wound around the slot 14 after an insulating member such as an insulator or an insulating film is mounted between the tooth 13 and the back yoke 16.
Further, at least one core piece recess 15d is provided in the circumferential direction on the outer peripheral surface 15c of the iron core piece 15.
The core piece recess 15 d is recessed inward in the radial direction of the stator core 11.
The laminated core piece recesses 15d form adhesive injection recesses 18 extending in the axial direction of the stator 1, and one end portion of which is an adhesive for connecting the stator core 11 and the frame 12 described later. It becomes an injection port.

FIG. 3 is a perspective view showing a state immediately before the stator core 11 and the frame 12 are fitted together.
As shown in FIG. 3, the stator core 11 is fitted inside the frame 12.
FIG. 4A is a cross-sectional view of the stator 1 in which the stator core 11 and the frame 12 are fitted together.
As shown in FIG. 4 (a), after the stator core 11 and the frame 12 are fitted together, a gap 19 is formed between the outer peripheral surface 11 a of the stator core 11 and the inner peripheral surface 12 a of the frame 12. Is done.
After the stator core 11 and the frame 12 are combined, a bracket 7 having a portion for preventing leakage of the adhesive is attached to the lower side of these members.
FIG. 4B is a cross-sectional view of the stator 1 fitted with the bracket 7 taken along the line AA in FIG.
As shown in FIG. 4B, the bracket 7 serves to block the lower end of the gap 19 including the lower end of the adhesive injection recess 18 and prevent leakage of the adhesive.

Adhesive is poured into the gap 19 using a hole formed at an end of the adhesive injection recess 18 provided in the frame 12 and the stator core 11 as an injection port.
When the adhesive is cured, an adhesive layer having the same shape as the gap 19 is formed.
The adhesive injection recess 18 serving as an adhesive injection port may be provided at one location, but in consideration of the curing time of the adhesive, a plurality of adhesive injection recesses 18 are provided in the circumferential direction of the stator core 11 as shown in FIG. The adhesive layer is formed more stably when injected from the injection recess 18.

According to the invention according to the first embodiment, since the adhesive is injected from the adhesive injection recess 18 provided at least one place in the circumferential direction on the core outer peripheral surface 11a of the stator core 11, the stator core 11 A uniform adhesive layer is formed in the gap 19 of the frame 12.
Moreover, since the convex part which protrudes in the orthogonal | vertical direction with respect to the rotation direction of the rotary electric machine 100 is formed in the contact bonding layer between the stator iron core 11 and the flame | frame 12, it can resist the rotational reaction force of the rotor 2. FIG. The stator 1 of the rotary electric machine 100 having a highly reliable adhesive layer can be obtained.

Further, when the frame 12 and the stator core 11 are fixed, a high fixing strength can be secured without applying stress to the stator core 11.
Thereby, iron loss reduction can be suppressed, and a highly efficient rotating electrical machine 100 can be obtained.

  Further, since the gap 19 between the stator core 11 and the frame 12 is filled with a resin material having a higher thermal conductivity than air, the contact surface heat transfer coefficient between the stator core 11 and the frame 12 is improved, and the rotating electrical machine 100 The heat dissipation can be improved, and a highly efficient rotating electrical machine can be obtained.

Embodiment 2. FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the second embodiment of the present invention will be described with a focus on differences from the first embodiment with reference to the drawings.
FIG. 5 is a perspective view of stator core 211 of the rotating electrical machine according to the present embodiment.
FIG. 6A is a plan view of an iron core piece 215 </ b> A that constitutes the stator iron core 211.
FIG. 6B is a plan view of the core piece 215 </ b> B constituting the stator core 211.
The arrangement (position and number) of the core piece recesses 215Ad and 215Bd formed on the outer peripheral surfaces of the respective core pieces 215A and 215B is the same.
The difference between the iron core piece 215A (first iron core piece) and the iron core piece 215B (second iron core piece) is that the width and depth in the circumferential direction of the iron core piece recesses 215Ad and 215Bd are different.
As shown in FIGS. 6A and 6B, the circumferential width wi1 of the core piece recess 215Ad of the core piece 215A is narrower than the circumferential width wi2 of the core piece recess 215Bd of the core piece 215B.
In addition, the depth de1 in the radial direction of the core piece recess 215Ad of the core piece 215A is shallower than the depth de2 in the radial direction of the core piece recess 215Bd of the core piece 215B.

As shown in FIG. 5, the stator core 211 is configured by stacking a predetermined number of core pieces 215A and 215B.
With this configuration, the adhesive injection recess 218 extends continuously in the axial direction of the stator core 211 on the core outer peripheral surface 211a of the stator core 211 and changes in width and depth along the way. Is formed.

According to the stator of the rotating electrical machine and the rotating electrical machine according to the present embodiment, the adhesive filled in the concave portion 218 for injecting the adhesive between the core outer peripheral surface 211a of the stator core 211 and the inner peripheral surface of the frame; An integrated adhesive layer is formed.
Since the concave portion 218 for injecting the adhesive has two or more steps in the axial direction of the stator core 211, it can resist the rotational reaction force described in the first embodiment with high strength, and at the same time, in the axial direction. It is possible to form a highly reliable adhesive layer that can withstand high external strength against the external force.
In the present embodiment, the example in which both the width and the depth in the circumferential direction of the iron core piece recesses 215Ad and 215Bd are different is shown, but the same effect can be obtained even when only one of them is different.
In the present embodiment, a semicircular concave portion is used as an example, but a triangular or quadrangular concave portion may be used.

Embodiment 3 FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the third embodiment of the present invention will be described with a focus on differences from the first and second embodiments with reference to the drawings.
FIG. 7 is a perspective view of the stator 301.
FIG. 8 is a cross-sectional view of the stator 301 in which the stator core 311 and the frame 312 are fitted.
As shown in FIG. 7 and FIG. 8, in addition to the adhesive injection recess 318 for injecting adhesive, a part of the frame 312 is placed on the core outer peripheral surface 311 a of the stator core 311 in the radial direction of the stator core 311. A locking recess 6b (rotation prevention recess) that engages with a locking projection 6a (rotation prevention projection) formed by being pushed out to the center side is provided.
Even if the locking convex portion 6a of the frame 312 is formed in a step before the stator core 311 is fitted in the frame 312, after the stator core 311 is fitted in the frame 312, a part thereof is pushed in. It may be formed.
Moreover, when forming the latching convex part 6a of the frame 312, pressurization may be performed from the outer peripheral side of the frame 312 with a punch or the like at normal temperature, but pressurization may be performed after locally heating the pressurization part.

According to the stator of the rotating electrical machine and the rotating electrical machine according to the present embodiment, the stator core 311 and the frame 312 are coupled with an adhesive, and at the same time, the locking recess 6b of the stator core 311 and the locking protrusion of the frame 312. By fitting and fixing 6a, a rotating electrical machine with high fixing strength can be obtained particularly in the circumferential direction.
Further, since the stator core 311 is fixed by using a part of the frame 312 without using mechanical parts such as bolts and pins, an inexpensive rotating electrical machine can be obtained.
Further, since the total volume of the gap 319 is reduced, the amount of adhesive used can be reduced, and a rotating electrical machine capable of suppressing the manufacturing cost can be obtained.
Further, when the locking projection 6a is formed by pressing from the outer peripheral surface side of the frame 312 after locally heating the frame 312, the locking recess 6b of the stator core 311 and the frame 312 are locked by heat shrinkage. The gap between the convex portions 6a is reduced, and as a result, a rotating electrical machine with high positional accuracy between the stator core 311 and the frame 312 can be obtained.

Embodiment 4 FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the fourth embodiment of the present invention will be described with a focus on differences from the first to third embodiments with reference to the drawings.
FIG. 9 is a perspective view of the stator core 411.
As shown in the figure, the stator core 411 is formed with an adhesive injection recess 418 and a locking recess 406b for engaging with a locking protrusion 6a provided on the frame on the outer peripheral surface 411a of the core.
The adhesive injection recess 418 is continuously formed in the entire stacking direction, and the locking recess 406b is intermittently formed in the stacking direction.
According to the stator of the rotating electrical machine and the rotating electrical machine according to the present embodiment, the stator recess 406b to be engaged with the locking protrusion 6a of the frame is formed on the outer peripheral surface 411a of the stator core 411. A rotating electrical machine having a high fixed strength in the circumferential direction and the axial direction of the iron core 411 can be obtained.

Embodiment 5 FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the fifth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the third and fourth embodiments.
FIG. 10 is a cross-sectional view of the stator 501.
In the present embodiment, the locking projection provided on the frame described in Embodiments 3 and 4 is locked to the adhesive injection recess 518.
Thereby, unlike Embodiments 3 and 4, it is not necessary to provide a separate locking recess on the outer peripheral surface of the stator core 511, and the amount of adhesive used can be saved.

Embodiment 6 FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the sixth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 11 is a cross-sectional view of the stator 601.
In the first embodiment, the adhesive injection recess 18 is provided on the outer peripheral surface 11a of the stator core 11. However, in this embodiment, the concave portion 18 is provided on the inner peripheral surface 612a of the frame 612.
Other configurations are the same as those of the first embodiment.
According to the stator of the rotating electrical machine and the rotating electrical machine according to the present embodiment, the same effect as in the first embodiment can be obtained.
Further, since the adhesive injection recess 518 can be formed in a flat plate state before the frame 612 is processed into a cylindrical shape, the processing is easy.

Embodiment 7 FIG.
Hereinafter, the stator and the rotating electrical machine of the rotating electrical machine according to the seventh embodiment of the present invention will be described with a focus on differences from the first and sixth embodiments with reference to the drawings.
FIG. 12 is a cross-sectional view of the stator 701.
In the first and sixth embodiments, the adhesive injection recess 18 is provided on either the core outer peripheral surface 11 a of the stator core 11 or the inner peripheral surface 612 a of the frame 612.
In the present embodiment, adhesive injection recesses 718a and 718b are provided facing both the inner peripheral surface 712a of the frame 712 and the iron core outer peripheral surface 711a of the stator core 711.
Other configurations are the same as those of the first and sixth embodiments.
According to the stator of the rotating electrical machine and the rotating electrical machine according to the present embodiment, the stator core 711 and the frame 712 can be fixed more strongly than in the first and sixth embodiments.
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100 rotating electric machine, 1,301,501,601,701 stator,
11, 211, 311, 411, 511, 711 stator core,
11a, 211a, 311a, 411a, 711a Iron core outer peripheral surface,
12, 312, 612, 712 frame, 12a, 612a, 712a inner peripheral surface,
13 teeth, 14 slots, 15, 215A, 215B core pieces,
15a Back yoke part, 15b Teeth part, 15c Outer peripheral surface,
15d, 215Ad, 215Bd Iron core piece recess, 16 Back yoke,
18, 218, 318, 418, 518, 718a, 718b adhesive injection recess,
19,319 gap, 2 rotor, 21 rotor core, 22 shaft,
6a, 506a locking projection, 6b, 406b locking recess, 7 bracket,
de1, de2 depth, wi1, wi2 width.

Claims (5)

A stator core having an annular back yoke and a plurality of teeth arranged to protrude from the back yoke to the inner peripheral side;
A coil that is insulated and wound around the stator core in a slot formed between adjacent teeth of the stator core;
In a stator of a rotating electrical machine comprising a cylindrical frame that houses the stator core inside,
Wherein the outer peripheral surface of the stator core, having an adhesive injection recess extending in the axial direction of the stator, said stator core and said frame is adhesively bonded,
The stator core is configured by laminating a plurality of core pieces each having a core piece recess recessed in the radially inner direction of the stator core on the outer peripheral surface,
The laminated iron core piece recesses form the adhesive injection recesses,
A first core piece having a first recess as the core piece recess on an outer peripheral surface of the core piece, and a second core piece having a second recess having a shape different from the first recess as the core piece recess. A stator of a rotating electrical machine that exists and has a predetermined number of first iron core pieces and second iron core pieces alternately stacked. The anti-rotation convex portion protruding from the inner peripheral surface of the frame toward the central axis in the radial direction of the frame prevents the adhesive injection concave portion from rotating in the circumferential direction within the frame. The stator of the rotating electrical machine according to claim 1 , wherein the stator is engaged with the stator. An anti-rotation convex portion that protrudes from the inner peripheral surface of the frame toward the radial central axis side of the frame is an anti-rotation concave portion provided on the outer peripheral surface of the stator core, and the stator core is the frame stator according to claim 1, the inner engaged so as not to rotate in the circumferential direction. The inner peripheral surface of the frame, the frame-side adhesive injection recess extending in the axial direction of the stator is provided, wherein an adhesive injection recess, the stator-side adhesive injection recess before notated frame The stator of the rotating electrical machine according to any one of claims 1 to 3 , wherein the stator is disposed so as to face the side adhesive injection recess. A rotating electrical machine comprising the stator according to any one of claims 1 to 4 and a rotor disposed to face an inner peripheral surface of the stator core.

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