JP4411950B2 - Electric motor stator, manufacturing method thereof, and permanent magnet electric motor using the stator - Google Patents

Description

  The present invention relates to a motor stator having a permanent magnet on a rotor and a winding on a stator, a manufacturing method thereof, and a permanent magnet motor using the stator, and more particularly to an insulating configuration thereof.

In the first prior art, when the stator iron core is divided for each tooth and insulated, the insulation of each tooth is constituted by the insulation sheet of the length of the iron core of the electric motor (see, for example, Patent Document 1). .
JP 2003-61286 A

The stator iron core described in Patent Document 1 is intended to insulate the coil end of the winding body and reduce the thickness of the motor. For this purpose, the coil winding portion of the slot portion of the laminated iron core is provided on the insulating sheet. A part that insulates the inside, a part that covers the side of the winding body, and a tab that protrudes from the laminated thickness of the laminated iron core are integrally provided on this part, and the wound winding body is bent at the part of the insulating sheet, and After that, the tabs provided at the left and right and upper and lower ends are bent to insulate the coil at the end in the stacking direction.
However, the first prior art is to insulate the stator iron core with only the insulating sheet, which has a problem in mechanical strength, and in particular, the end in the longitudinal direction of the teeth tends to be damaged by contact or the like. It was.

Therefore, in the second prior art, in order to sufficiently protect the end portion in the longitudinal direction of the tooth, when the stator iron core is divided and insulated for each tooth, the length corresponding to the iron core length of the electric motor is used. The resin insulation parts were inserted from both longitudinal directions of each tooth, and the insulation was constituted by the resin insulation parts.
8A and 8B are perspective views for explaining a stator iron core according to the second prior art, in which FIG. 8A shows before assembly and FIG. 8B shows after assembly.
In FIG. 1 (a), 100 'is a motor stator according to the second prior art, 10 is a laminated iron core formed by laminating a number of electromagnetic steel sheets 11 punched into a predetermined shape, 80 is a resin insulation part, 1 An alternative to the prior art insulation sheet. Two of these are used and inserted from both ends of the laminated iron core 10 toward the center direction.
When two resin insulation parts 80 are inserted into the laminated iron core 10, the motor stator 100 'becomes as shown in FIG. (B) and is damaged by the resin insulation parts 80 even if the ends are in contact with each other. It is difficult to do.

However, it is common for motors to have the same cross-sectional shape and to have multiple products with different iron core lengths. However, in the second prior art, if the iron core length is changed, multiple types of resin insulation parts are required. Became.
FIG. 9 is a perspective view for explaining a stator iron core having a laminated iron core larger than the number of laminated magnetic steel sheets shown in FIG. 8, wherein (a) shows before assembly and (b) shows after assembly. .
In FIG. 1A, 200 ′ is a motor stator having a large number of layers, 10 ′ is a laminated iron core formed by laminating a larger number of electromagnetic steel sheets 11 than that of FIG. 8, 90 is a resin insulating part, and the number of layers is The length in the longitudinal direction is longer than that of the resin insulating part 80 shown in FIG. When the two resin insulation components 90 are inserted into the laminated iron core 10 ′, the motor stator 200 ′ becomes as shown in the core diagram (b), and even if the number of laminated iron cores 10 ′ increases, Since the resin insulating component 90 having a long length in the longitudinal direction is used, the entire length direction of the teeth is insulated.

FIG. 10 is a diagram showing two types of motor stators having different lengths according to the second prior art. FIG. 10A is a side view of the motor stator having a predetermined length, and the right side is a front view. FIG. 4B is a side view of the motor stator having a length longer than that of the motor stator of FIG. It can be seen from both figures that in the figure (b) in which more laminated iron cores are used than in the figure (a), the resin insulation component 90 is longer in the longitudinal direction than the resin insulation component 80. It means that you are using something.
As described above, when the iron core length is changed, the second prior art requires a plurality of types of resin insulating parts (in this case, two types of 80 and 90).
By the way, injection molding or the like is used as a technique for manufacturing a resin insulating part, but the same number of molds are required to manufacture a plurality of insulating parts. It had the problem of being expensive.
Therefore, the present invention has been made in view of such problems, and an electric motor stator capable of minimizing the cost of mold production and obtaining an excellent insulation configuration with workability and quality, and its It is an object of the present invention to provide a manufacturing method and a permanent magnet type electric motor using the stator.

In order to solve the above problem, an invention according to claim 1 is a laminate of electrical steel sheets having the same shape punched into a shape comprising an outer peripheral yoke forming a part of a circumference and teeth extending at right angles to the outer peripheral yoke. When configured laminated iron core, not covering the both ends in the width direction of the teeth toward the center from both ends of the stacking direction of the laminated iron core, and the exposed portion of part of the stacking direction of the teeth are exposed And two resin insulation parts which are inserted in a U-shape so as to form a metal, and the resin insulation parts include two cantilever members and a connecting portion for connecting the two cantilever members. The notch for inserting the insulating sheet is provided at the tip of the cantilever member, and the insulating sheet having a length in the longitudinal direction shorter than the dimension in the laminating direction of the laminated iron core is inserted into the notch to cover the exposed portion and It is characterized by being configured slot insulation I.
According to a second aspect of the present invention, the notch is formed in a U-shape on each cantilever member on a surface perpendicular to the length direction of the cantilever member, and the insulating sheet has the U-shape. It is characterized by being housed in a notch.
Invention of Claim 3 is a manufacturing method of the motor stator which manufactures the motor stator of Claim 1 , Comprising: When the number of lamination | stacking of the said laminated body is changed, the said resin insulation parts before a change using a resin insulating parts having the same dimensions as, it changes the changing only the length of the stacking direction of the insulating sheet before, the length the short had insulating sheet than the dimension of the stacking direction of the stacked iron core The slot insulation is configured by inserting into the notch and covering the exposed portion .
Fourth aspect of the present invention, through a gap a plurality of outer circumferential yoke between the motor stator of claim 1, wherein a stator comprising by adjacent, in the internal space formed by the teeth tips of the stator And a rotor with permanent magnets arranged in the manner described above.

With the above configuration, when making products with a changed iron core length, resin insulation parts are shared, and the length of the insulation sheet can be changed to easily create a new armature. A stator can be configured.
Because of this, even when making products with different iron core lengths, there is no need to make additional molds for resin insulation parts.
In addition, the resin insulation parts are provided with a scraper in the part that overlaps the insulation sheet, and the insulation sheet is sandwiched and fixed between the resin insulation and the iron core, so it may be displaced or detached during winding work. Absent. Moreover, since the insulating sheet and the resin part have an overlapping portion, the insulating performance does not deteriorate.
As described above, according to the present invention, an armature stator having an insulating configuration excellent in workability and quality can be obtained without incurring mold production costs. By combining a plurality of insulated iron cores, a stator can be formed as an annular shape, and by arranging a rotor with a permanent magnet in the inner space of the stator, permanent magnet motors of different lengths can be obtained. Easy to configure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view of a first embodiment of the present invention before assembly of a stator core with a small number of laminated magnetic steel sheets, FIG. 2 is a perspective view after assembly of resin insulation parts, and FIG. FIG. 3 is a perspective view of an electric motor stator that has been assembled after an insulating sheet is assembled.
In FIG. 1, 100 is an electric motor stator according to the first embodiment of the present invention, 10 is a laminated iron core formed by laminating a large number of electromagnetic steel plates 11, 20 is a resin insulating component, and 30 is an insulating sheet.
The electromagnetic steel sheet 11 is punched into a shape composed of an outer peripheral yoke 11a forming a part of a circumference and a tooth 11b extending perpendicularly to the outer peripheral yoke 11a.
A laminated body is constituted by laminating a large number of electromagnetic steel sheets 11.
Further, when the outer peripheral yokes 11a of the electromagnetic steel sheet 11 are adjacently connected to each other, an annular stator is completed. In this case, an electric motor is completed by disposing a rotor with a permanent magnet in an inner space of a cylinder formed by the tips of teeth 11b of the annular stator via a gap.

The resin-made insulating component 20 includes two cantilever members 21 each forming a side wall portion and a connecting portion 22 that connects these two cantilever members 21, and has a U-shape as a whole. The two cantilever members 21 are inserted so as to cover both ends of the teeth in the width direction from both ends in the stacking direction of the laminated iron core toward the center.
The length of the cantilever member 21 is set such that a gap is formed at the position where the tip ends each other with the two cantilever members 21 inserted, so that a part of the teeth is exposed. is there. The exposed portion of the teeth is covered with an insulating sheet 30.
In order to insert and fix the insulating sheet 30, horizontal cutouts 21h are formed in the longitudinal tip 21b of the upper overhanging portion 21a of the cantilever member 21 and the longitudinal tip 21d of the downward overhanging portion 21c, respectively. Yes. Further, a vertical cutout 21g connecting the upper and lower horizontal cutouts 21h and 21h is formed.
The connecting portion 22 is formed with an upper projecting portion 23 and a lower projecting portion 24 on the side opposite to the side facing the cantilever member 21, and the side facing the cantilever member 21 is formed slightly higher than the length of the cantilever member 21. And serves as a stopper portion 23 a that contacts the laminated iron core 10.

  The insulating sheet 30 is formed by folding a lower portion 32 and an upper portion 33 of a thick paper 31 to the opposite side of the laminated iron core 10 in a U-shaped cross section. The insulating sheet 30 is inserted into a U-shaped notch formed at the end of the resin insulation parts 20 and 20 in FIG. The exposed portion of the core 10 is completely covered as shown in FIG.

Using the two resin insulating parts 20 formed as described above, each cantilever member 21 is inserted so as to sandwich the laminated iron core 10 from both ends of the laminated iron core 10 toward the center. Thus, as shown in FIG. 3, both ends of the teeth 11b in the width direction are covered except for the vicinity of the central portion.
As described above, the resin insulating component 20 is provided with a notch in a portion overlapping the insulating sheet 30, and the insulating sheet 30 is sandwiched and fixed between the laminated iron core 10 and the resin insulating component 20, There is no slippage or disengagement during winding work.
Moreover, since the insulating sheet and the resin part have an overlapping portion, the insulating performance does not deteriorate.

(Second embodiment)
The second embodiment of the present invention relates to manufacturing that is cost-effective in the case of a stator iron core in which the number of laminated magnetic steel sheets is greater than that of the first embodiment. FIG. 4 is a perspective view before assembly. FIG. 5 is a perspective view after assembly of a resin insulating part, and FIG. 6 is a perspective view of an electric motor stator that has been assembled after the insulation sheet is assembled.
In FIG. 4, 200 is a motor stator according to the second embodiment of the present invention, 10 'is a laminated iron core formed by laminating a larger number of electromagnetic steel plates 11 than in the case of FIG. 1 (first embodiment), 20 Is an insulating part made of resin, and 30 'is an insulating sheet. The resin insulating component 20 is exactly the same as that of FIG.
The single unit of the electromagnetic steel sheet 11 is exactly the same as that of FIG. However, the number of stacked layers is larger than in the case of FIG.
The insulating sheet 30 ′ is the same as the case of FIG. 1 except that the lower portion 32 and the upper portion 33 of the thick paper 31 are folded in a U-shaped cross section on the opposite side of the laminated iron core 10, respectively. The length is longer than that of the insulating sheet of FIG. In FIG. 5, it can be seen that the teeth are exposed over a long distance at the center of the laminated iron core 10 ′. Therefore, by inserting this horizontally long insulating sheet 30 'into a notch formed in the vicinity of the mutual butting position of the tips of the resin insulating parts 20, 20, the long exposed portion of the teeth is completely as shown in FIG. It will be covered with.

FIG. 7 is a view collectively showing the inventions according to the first and second embodiments of the present invention, wherein (a) is a view showing a laminated iron core used in the present invention, the left is a side view, and the right is a front view. FIG.
(B) is a figure which shows the resin-made insulation components used in common by this invention, The left is a side view and the right is a front view. (C) is a figure which shows the insulating sheet used by this invention, the left is a side view, and the right is a front view. (D) is a figure which shows the electric motor stator which concerns on 1st Example of this invention, The left is a side view, The right is a front view, (e) is XX sectional top view of FIG. (E).
(F) is a figure which shows the motor stator based on 2nd Example of this invention, The left is a side view, The right is a front view.
Common to each figure, 10 and 10 'are laminated iron cores, 20 are resin insulation components, and 30 and 30' are insulation sheets. A sheet insertion horizontal notch 21h (FIG. D) is formed at the longitudinal tip 21b of the upper overhang 21a, and the sheet insertion horizontal notch is also formed at the longitudinal tip 21d of the lower overhang 21c. 21h (FIG. D) is formed. And the vertical notch 21g (FIG. E) which connects the upper and lower sheet insertion horizontal notches 21h is formed.
Since this notch 21h-21g-21h forms a gap between the laminated iron core 10 and the resin insulation component 20, the insulation sheet 30 can be easily guided and fixed by inserting the insulation sheet 30 into this gap. It can be done.

As described above, according to the present invention, when making a stator iron core having a changed iron core length, the same resin insulating parts are used in common, and only the length of the insulating sheet is changed. It becomes possible to easily cope with a new motor stator having a length.
Because of this, even when making products with different iron core lengths, there is no need to make additional molds for resin insulation parts.
As described above, according to the present invention, an electric motor stator having an insulating configuration excellent in workability and quality can be obtained without incurring mold production costs. By combining a plurality of insulated iron cores, a stator can be formed as an annular shape, and by arranging a rotor in the inner space of the stator, it is possible to easily configure motors of different lengths. it can.

It is a perspective view before the assembly of the stator iron core which concerns on 1st Example of this invention. FIG. 2 is a perspective view after assembly of the resin insulating component in FIG. 1. FIG. 3 is a perspective view of a finished product after the insulating sheet in FIG. 2 is assembled. It is a perspective view before the assembly of the stator core which concerns on 2nd Example of this invention. FIG. 5 is a perspective view after assembly of the resin insulating component in FIG. 4. FIG. 6 is a perspective view of a finished product after the insulating sheet in FIG. 5 is assembled. It is a figure which shows collectively the invention which concerns on the 1st and 2nd Example of this invention. It is a perspective view explaining the stator iron core concerning the 2nd prior art, (a) shows before an assembly and (b) shows after an assembly, respectively. FIGS. 9A and 9B are perspective views for explaining a stator iron core having a number of laminated iron cores greater than the number of laminated layers in FIG. 8, in which FIG. It is a figure which shows two types of motor stators from which the length which concerns on a 2nd prior art differs.

Explanation of symbols

100 Electric motor stator (first embodiment of the present invention)
200 Electric motor stator (second embodiment of the present invention)
10, 10 'Laminated iron core 11 Magnetic steel sheet 11a Outer yoke 11b Teeth 20 Resin insulation component 21 Cantilever 21a Upper overhanging portion 21b Upper overhanging longitudinal tip 21c Downward overhanging portion 21d Lower overhanging longitudinal tip 21g Insulating sheet insertion Notch (vertical surface)
21h Notch for inserting insulation sheet (horizontal plane)
22 Connecting part 23 Upper projecting part 23a Stopper part 24 Lower projecting part 30, 30 'Insulating sheet 31 Paper 32 Lower part 33 Upper part

Claims (4)

A laminated iron core comprising a laminate of electromagnetic steel sheets of the same shape punched into a shape comprising an outer peripheral yoke forming a part of the circumference and teeth extending at right angles to the outer peripheral yoke;
Toward the center from both ends of the stacking direction of the laminated iron core has covered the ends of the width direction of the teeth, and a part of the stacking direction of the teeth are inserted so as to form an exposed portion exposed overall feature and two plastic insulating parts in which the U-shaped, and
The resin insulating part is composed of two cantilever members and a connecting portion for connecting the two cantilever members, and a notch for inserting an insulating sheet is provided at the tip of the cantilever member. A motor stator, wherein a slot insulation is configured by inserting an insulating sheet having a length in a longitudinal direction shorter than a dimension in the laminating direction of the laminated iron core to cover the exposed portion .   The notches are formed in each cantilever member in a U-shape on a surface perpendicular to the length direction of the cantilever members, and the insulating sheet is accommodated in the U-shaped notches. The electric motor stator according to claim 1. A method of manufacturing an electric motor stator according to claim 1 , wherein when the number of stacked layers of the laminated body is changed, the resin insulating parts having the same dimensions as the resin insulating parts before the change the used, changing only the length of the stacking direction of the insulating sheet before the change, the exposed the said stacking direction of the short had insulating sheet than the dimensions of the laminated iron core length is inserted into away the cut A method of manufacturing an electric motor stator, characterized in that slot insulation is formed by covering a portion . The rotation with a permanent magnet arrange | positioned through the space | gap in the internal space formed by the stator which adjoins the some outer periphery yoke of the motor stator of Claim 1, and the said teeth front-end | tips of this stator A permanent magnet type electric motor.

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