JPH1118341A - Stator for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a motor wherein insulation between an outer core and a forcibly inserted inner core is enabled by simple structure. SOLUTION: In an annular outer core 10, a fitting groove 12 is formed, in which an inner core 20 is forcibly inserted. A coil winding part 30 wound around the inner core 20 inserts the base end side and the tip end side of a protruding part 21b of the inner core 20 into a through hole formed in the central part of a pair of insulating sheets 22. Side edge parts 23a, 23b, 24a, 24b are arranged between the insulating sheets 22, bent along the side surface of the coil winding part 30 on at least one of the insulating sheets 22, and positioned between the side surface of the coil winding part 30 and the inside surface of an outer core. The side edge parts are installed as insulating members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor in which an inner core is press-fitted into an outer core via an insulating member.

[0002]

2. Description of the Related Art As a stator of a conventional electric motor, for example, as shown in FIG.
It is considered that the inner core 2 includes a pair of inner cores 2 that are press-fitted therein, and an insulating paper 4 that insulates the coil winding part 3 wound around the inner core 2 from the outer core 1.

The outer core 1 has opposed short sides 1b, 1b
And a pair of long sides 1c, 1c, are formed in a substantially rectangular and annular shape, and have a square hole 1a inside. The short side 1b is formed with a dovetail-shaped fitting groove 1d that is open to both sides of the rectangular hole 1a and the short side 1b.

[0004] The inner core 2 has a base 2a that press-fits into the fitting groove 1d and a protrusion 2b that projects from the base 2a into the inner hole 1a of the outer core 1. A rotor space C is formed between the tip portions of the pair of protrusions 2b.

[0005] A coil winding frame 5 on which the coil winding portion 3 is wound is mounted on the protruding portion 2 b of the inner core 2.
The coil winding frame 5 insulates the coil winding portion 3 from the inner core 2 and also insulates the side surface 3a of the coil winding portion 3 from the square hole 1a of the outer core 1 facing the side surface 3a. ing.

An insulating paper 4 is inserted inside the rectangular holes 1a of the long sides 1c, 1c. This insulating paper 4 insulates the outer peripheral surface 3b of the coil winding part 3 from the inner surface of the rectangular hole 1a of the long sides 1c, 1c. The insulating paper 4 to be inserted is indicated by a two-dot chain line.

[0007]

However, in the above-mentioned electric motor stator, after the insulating paper 4 is inserted into the long side 1c of the outer core 1 and the inner surface of the rectangular hole 1a, the fitting groove 1d of the outer core 1 is inserted. , The base 2a of the inner core 2 is press-fitted. However, during this press-fitting, the inner core 2 is pressed into the fitting groove 1d of the outer core 1 while shaking, so that the tip of the outer peripheral surface 3b of the coil winding part 3 slides on the insulating paper 4 and the insulating paper 4 is displaced. As a result, there is a problem in that the insulating property between the outer peripheral surface 3b of the coil winding part 3 and the inner hole surface of the outer core 1 facing thereto is impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator for an electric motor which can insulate an outer core and a coil of a press-fitted inner core with a simple structure.

[0009]

In order to achieve this object, an invention according to a first aspect of the present invention is directed to an annular outer core provided with fitting grooves which are open at both end faces and an inner face, and a base formed by the fitting grooves. An inner core that protrudes into the outer core in a state where the end is press-fitted, and has a tip facing the rotor; a side surface of a winding portion of a coil wound around the protrusion of the inner core; and an inner surface of the outer core. In the electric motor stator having an insulating member interposed therebetween, the base end side and the distal end side of the protruding portion of the inner core are inserted into an insertion hole provided at the center of the pair of insulating sheets, respectively. The winding portion is disposed between the sheets, and is bent along at least one of the insulating members along the side surface of the winding portion, and between the side surface of the winding portion and the inner surface of the outer core. It is characterized in that the located side edge is provided as the insulating member. To.

The invention according to claim 2 is characterized in that, when the inner core is inserted into the outer core, the outer core end face is formed between the side edge and the inner core. A notch is formed to bend the side edge portion along the side surface of the winding portion in cooperation with a corner portion with the side surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electric motor according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes an outer core of a stator,
Reference numeral 20 denotes an inner core pressed into the outer core 10.

The outer core 10 has opposite core short sides 10.
a, 10b (not shown) and these core short sides 10a, 1
0b, the core long sides 10c and 10 provided continuously at both ends, respectively.
d is formed in a substantially rectangular and annular shape. A rectangular hole 11 is formed inside the outer core 10, and L1 is the inner width of the rectangular hole 11.

The core short side 10a (10b) is formed with a square hole 11 and a dovetail-shaped fitting groove 12 opened on both sides of the short side 10a (10b). The fitting groove 12 is formed substantially at the center of the core short side 10a (10b).

As shown in FIG. 2, the inner core 20 includes a core body 21, a coil insulating sheet 22 mounted on the core body 21, and a coil winding part 30 wound on the coil insulating sheet 22. It is composed of

The core body 21 includes a base portion 21a and an intermediate portion 21.
b and the tip 21c.

The base 21a and a part (base end side) of the intermediate part 21b are fitted into the fitting groove 12 of the outer core 10, and the intermediate part 21b (projection) and the tip part 21c are square in the outer core 10. It protrudes into the hole 11.

An arc-shaped concave surface 21d facing the rotor is formed at the tip portions 21c, 21c. A rotor space C is formed in the square hole 11 by the opposing concave surfaces 21d and 21d.

A coil winding part 30 is wound around the intermediate part 21b in the direction of the core short sides 10a and (10b) of the outer core 10 via insulating means.

Coil insulation sheet 22 as insulation means
The (insulating sheet) includes a side insulating sheet 23 along the side surface 30a of the coil winding portion 30 on the base 21a side, and a tip 21c.
And a side insulating sheet 24 along the side surface 30b of the coil winding portion 30.

The side insulating sheet 23 extends the side edge sheet (side edge) 23a to the core long side 10c of the outer core 10 and the side edge sheet (side edge) 23b to the core long side 10d. Has been extended.

The side insulating sheet 24 is formed on the outer core 1.
0 side edge sheet portions (side edge portions) 24 on both sides of the core long side 10c.
a, and the core long side 1 of the outer core 10
The side edge sheet portion (side edge portion) 24b extends to the 0d side.

The side insulating sheets 23a and 23b and the side insulating sheets 24a and 24b are bent to face each other.

The side insulating sheets 23 and 24 are formed as shown in FIG.
As shown in FIG. 3, the side edge sheet portions 23a, 24a, the side edge sheet portions 23b, 24b, and the side edge sheet portions 23a,
Rear sheet portions 23c and 24c connected to both ends of 23b, 24a and 24b, and front sheet portions 23d and 2 respectively.
4d, and is formed in a substantially rectangular and annular shape.

At the center of the side insulating sheet 23, a substantially rectangular insertion hole 25 is formed.
The intermediate portion 21b of the inner core 20 on the side of the distal end portion 21c is inserted.

A substantially rectangular insertion hole 26 is formed at the center of the side insulating sheet 24, and an intermediate portion 21 b on the base 21 a side of the inner core 20 is inserted into the insertion hole 26. In the drawing, P is a side edge sheet portion 23a, 23b, 24a, 24b attached at the time of manufacturing the coil insulating sheet 22.
Fold groove.

Notches 23g are formed in the side edge sheet portions 23a and 23b at corners on the side of the front sheet portion 23d (the insertion side of the outer core 10), and the front edge sheet portions 24a and 24b are formed in the side edge sheet portions 24a and 24b. A cutout 24g is formed at the corner on the side of 24b (the insertion side of the outer core 10).

Tip width L between notches 23g and 24g
2 is smaller than the inner width L1 of the outer core 10 (FIG. 2).
reference). In addition, the coil winding part 30 is a side insulating sheet 2
The core body 21 is insulated by insulating paper (not shown) other than 3 and 24.

Next, the processing of the coil insulating sheet of this motor stator and the assembly of the members will be described.

First, the coil insulating sheet 22 is cut by the cutting device 40 shown in FIG.

First, a mold base 4 made of hard rubber or the like of the cutting device 40 is used.
1, a base paper G of the coil insulating sheet 22 is placed thereon, and a cutting tool 45 provided with an outer frame cutting blade 42, an inner frame cutting blade 43, and a forming member 44 of a fold groove P of the coil insulating sheet 22 is placed from above. Lower it.

The outer frame cutting blade 42 and the inner ring frame cutting blade 4
3 cuts the base paper G, and at the same time, the front end of the forming member 44 enters the fold forming groove 46, and the side edge insulating sheets 23, 23b, 23b, 23b, 24a, 24b are bent from the fold groove P. 24 are processed.

After the coil winding portion 30 is wound around the inner core 20 via the coil insulating sheet 22, the outer core 1
When the front sheet portions 23d and 24d narrower than the inner width L1 of the outer core 10 are inserted into the square holes 11 of the outer core 10 first, the surfaces of the core long sides 10c and 10d of the outer core 10 and the core long side 10
Notches 23g at the corners of c and 10d with the surface of square hole 11;
24g is in sliding contact with the bent side edge sheet portion 23a, 2
3b, 24a, 24b are automatically and sequentially bent from the tip.

When the press-fitting of the fitting groove 12 of the outer core 10 and the base 21a of the inner core 20 is completed, the side edge sheets 23a, 24a and the side edge sheets 23b, 24b overlap, and the overlapping side Edge sheet portions 23a, 2
4a, 23b and 24b insulate the outer peripheral surface of the coil winding part 30 from the square hole 11 of the outer core 10.

As described above, in the above embodiment, when the base 21 a of the inner core 20 is press-fitted into the fitting groove 12 of the outer core 10, the side edge sheet 23 of the coil insulating sheet 22 is pressed.
a, 24a and notches 23g, 24g formed in the side edge sheet portions 23b, 24b correspond to the core long side 10 of the outer core 10.
c, 10d, while sliding in contact with the corners, the side edge sheet portions 23a,
24a, 23b and 24b can be automatically bent.

When the inner core 20 is pressed into the outer core 10, the side edge sheet portions 23a, 23b,
The outer peripheral surface of the coil winding part 30 and the surface of the square hole 11 of the outer core 10 can be insulated by 23b, 24a, and 24b.

In the above-described embodiment, the side edge sheet portions 23a, 23b, 24a and 24b are formed on both sides of the side insulating sheets 23 and 24 of the coil insulating sheet 22, respectively. Seat portions 23a, 23b
Alternatively, the side edge sheet portions 24a and 24a of the side insulating sheet 24
4b may be formed to be longer than the outer peripheral width of the coil winding portion 30.

Also in this case, the side edge sheet portions 23a, 23
b or the side edge sheet portions 24a and 24b can insulate the outer peripheral surface of the coil winding portion 30 from the square hole 11 surface of the outer core 10.

[0039]

As described above, according to the first aspect of the present invention, an annular outer core provided with fitting grooves which are open at both end surfaces and an inner surface, and a base end portion is press-fitted into the fitting groove. An inner core protruding into the outer core in a state where the tip faces the rotor, and insulation between a side surface of a winding portion of a coil wound around the protrusion of the inner core and an inner surface of the outer core. In the electric motor stator in which the members are interposed, the base end side and the distal end side of the protruding portion of the inner core are inserted into the insertion holes provided in the center of the pair of insulating sheets, respectively, and the insulating sheet is provided between the insulating sheets. Arranging a winding portion, at least one of the insulating members is bent along a side surface of the winding portion,
Since a side edge located between the side surface of the winding portion and the inner surface of the outer core is provided as the insulating member,
When press-fitting the inner core to the outer core, the side edge overlaps between the side surface of the winding part and the inner surface of the outer core, and the side edge does not shift, and a simple configuration in which the side edge is provided However, insulation between the outer core and the coil winding of the press-fitted inner core can be achieved.

The invention according to claim 2 is characterized in that, when the inner core is inserted into the outer core, the outer core end face is formed at the corner of the side edge on the insertion side of the outer core. The notch cooperates with the corner between the outer core end face and the inner face because the notch is formed to bend the side edge along the side face of the winding part in cooperation with the corner with the side face. As a result, the side edges can be automatically bent, and the outer core can be insulated from the press-fitted coil winding of the inner core.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a motor stator according to the present invention.

FIG. 2 is a plan view and a side view of a main part of an inner core.

FIG. 3 is a view of each coil insulating sheet.

FIG. 4 is a sectional view of a main part of the coil insulating sheet cutting device.

FIG. 5 is a plan view of a main part of a conventional motor stator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Outer core 12 ... Fitting groove 20 ... Inner core 21b ... Protruding part 22 ... Insulating sheet (coil insulating sheet) 23a, 23b, 24a, 24b ... Side edge part (side edge sheet part)

Claims (2)

[Claims] An annular outer core provided with fitting grooves opening at both end faces and an inner side face, and a tip protruding into the outer core with a base end being press-fitted into the fitting groove and having a distal end provided with a rotor. And a motor stator in which an insulating member is interposed between a side surface of a winding portion of a coil wound around a protrusion of the inner core and an inner surface of the outer core. A base end side and a distal end side of the protruding portion of the inner core are inserted into an insertion hole provided at the center of the insulating sheet, respectively, and the winding portion is disposed between the insulating sheets, and at least the insulating member is provided. On the other hand, a side edge portion bent along the side surface of the winding portion and located between the side surface of the winding portion and the inner surface of the outer core is provided as the insulating member. Motor stator. 2. A corner of the side edge on a side where the side core is inserted into the outer core, cooperates with a corner between the outer core end face and the inner side face when the inner core is inserted into the outer core. 2. The stator for an electric motor according to claim 1, wherein a notch is formed to work and bend the side edge portion along a side surface of the winding portion.