JPH0591683A - Induction motor stator device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a stator device of an induction motor in which a stator device divided into an inner stator and an outer stator can surely prevent a radial displacement of the inner stator over a long period of time. [Structure] To prevent the inner stator from coming off in the radial direction when the inner stator is sandwiched between the outer stator, one or both end faces of the core of the inner stator at the fitting portion between the inner stator and the outer stator. A stator device for an induction motor configured by forming a wedge-shaped cut or a bent portion in a sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator device for an induction motor. More specifically, the present invention relates to a stator device in which a fitting portion between an inner stator and an outer stator of a stator device in which the stator device is divided into an inner stator and an outer stator is improved.

[0002]

2. Description of the Related Art An induction motor has a stator having a plurality of magnetic poles arranged around a squirrel cage rotor arranged at the center, and rotates the rotor by a rotating magnetic field of the stator. The rotation output of this electric motor depends on the strength of the magnetic field generated in the stator. On the other hand, winding a coil around the magnetic poles of the stator is structurally complicated, and a stator device that can obtain a strong magnetic field by easy assembly has been conventionally used. Improvements are being considered.

As a stator device of such an induction motor, for example, as disclosed in Japanese Utility Model Publication No. 37-24204 (55A02) or Japanese Utility Model Publication No. 60-22777 (H02K 1/14), A structure is disclosed in which the stator is divided into an outer stator and an inner stator in order to facilitate the winding process.

That is, a conventional stator device divided into two parts, an outer stator and an inner stator, is an inner stator having a shape in which a plurality of magnetic poles are radially projected on the outer circumference of a cylinder formed of a laminated body of magnetic plates. Since a cylindrical outer stator, which is also formed of a laminated body of magnetic plates, is press-fitted and formed on the outer circumference of, the coil can be wound around a plurality of magnetic poles of the inner stator to be assembled. , Easy to assemble.

[0005]

However, in the conventional stator device which is divided into the outer stator and the inner stator and assembled, since the central axis side of the magnetic poles of the inner stator is connected by the cylinder of the magnetic material, the magnetic poles are supposed to be centered. There is a problem that the magnetic flux to be directed to the rotor disposed in the rotor flows to the cylindrical portion having a small magnetic resistance, the amount of the magnetic flux reaching the rotor is reduced, and the efficiency of the electric motor is reduced.

[0006]

In view of such a situation, the present inventors have developed a stator device having a structure in which the stator is divided into an outer stator and an inner stator, and the stators are connected via a non-magnetic winding frame. ..

That is, as shown in the exploded perspective view of FIG. 7, a coil 20 composed of an inner coil 21 and an outer coil 22 is wound around a leg portion 14 of a winding frame 10 formed of a non-magnetic material, and a cutout portion 31 is formed.
The outer stator 30 formed by stacking the ring-shaped core 32 having the above-mentioned shape and the ring-shaped core 33 having no cutout portion is inserted into the outer periphery of the leg portion 14 of the winding frame 10. Then a long stick-shaped core
Inner stator 40 formed of a laminate of 41 and short core 42
The inside of the bobbin 10 and insert into the notch of the outer stator 30.
A long core 41 of the inner stator is fitted into 31 and sandwiched.

With this structure, the coil can be wound from the outside and the work is easy, and since the winding frame is made of a non-magnetic material, the magnetic poles of the inner stator 40 are magnetically separated, and the efficiency is improved. The magnetic field can be well concentrated on the rotor at the center.

However, in such a configuration, the inner stator is
After the 40 is clamped to the outer stator 30, the inner stator clamped to the outer stator 30 by an impact such as a fall or an impulse-like force such as a hammer used for alignment.
There is a possibility that 40 shifts to the inner diameter side of the stator device and the clearance dimension with the rotor changes. In such a case, there is a problem that the magnetic resistance changes and the variation in the characteristics of the motor increases, and in an extreme case, the inner stator 40 comes out.

In view of the above, the present invention is directed to a stator of an induction motor in which a stator device divided into an inner stator and an outer stator can surely prevent the inner stator from being displaced in the inner diameter direction for a long period of time. The purpose is to provide a device.

A stator device for an induction motor according to the present invention comprises a winding frame formed of a non-magnetic material and having a coil wound around it, and an outer stator and an inner stator sandwiched by the winding frame. Is a laminate of a core that is a ring-shaped thin plate and a core in which a cutout portion is formed, and the inner stator is a laminate of a long core and a short core that are stick-shaped thin plates, and the core of the outer stator. Is a stator device of an induction motor in which the long core of the inner stator is fitted in the cutout portion of the inner stator and the inner stator is sandwiched by the outer stator, and at least one outer periphery of the long core of the inner stator is provided. A wedge-shaped cut is formed in the side end portion to prevent the inner stator from slipping or falling off.

Still another structure of the present invention is that, instead of the core of the inner stator in which the wedge-shaped notch is formed in the above-mentioned stator device, at least one core of the inner stator in which the outer peripheral side end portion is bent in the axial direction. The inner stator is sandwiched by the structure having

[0013]

In the stator device constructed as described above, at least one core of the inner stator is provided with a cut portion or a bent portion, and each core of the inner stator is pressed and laminated by the protrusions provided on each core. Therefore, the entire inner stator can be firmly coupled to the outer stator, and the inner stator is not displaced or slipped out by an impulsive external force during manufacturing or an external force such as dropping.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a sandwiching portion of an outer stator and an inner stator, which is an embodiment of a stator device of the invention according to claim 1, and FIG. 2 is an sandwiching portion of the stator device of the invention according to claim 2. FIG. 3 is a diagram illustrating an embodiment, FIG. 3 is a diagram illustrating an embodiment of a sandwiching portion of a stator device according to a third aspect of the invention, and FIG. 4 is a diagram illustrating an sandwiching portion of a stator device according to a fourth aspect of the invention. FIG. 5 is a perspective view illustrating an embodiment, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is an explanatory view of an embodiment of a sandwiched portion of a stator device according to a fifth aspect of the invention.

In FIG. 1, reference numeral 30 denotes a laminated body of a ring-shaped core 32 having a notch portion 31 formed in the outer stator and a core 33 having no notch portion formed therein. The laminated body is formed by pressing the provided projections A. Stacked end side core of this outer stator 30
The notch 32a has a tapered notch 35a formed on the outer peripheral side in a tapered manner so that it can be accommodated when the notch is formed in the core of the inner stator.

Reference numeral 40 denotes an inner stator, which is formed of a laminated body of a stick-shaped long core 41 and a short core 42, and is similarly pressed against the protrusion B.

In this embodiment, the core 32 of the outer stator 30 is
The notch 31 formed in the above is an example formed in the entire radial direction of the core, and the tip of the long core 41 of the inner stator extends to the outer periphery of the outer stator and is fitted therein.

In this way, the inner stator 40 becomes the outer stator.
When it is fitted to 30 (Fig. 1a), its laminated end side core 41
Wedge-shaped notch 44 by a processing jig 50 on the outer peripheral side edge of a
Is formed and the ends are pushed apart (FIG. 1b) to prevent the inner stator 40 from moving toward the inner peripheral side of the bobbin 10.
On the outer peripheral side, the short core 42 of the inner stator 40 is
The inner stator 40 is firmly sandwiched and fixed to the outer stator 30 because it does not move against the outer stator 30.

In the embodiment described above, the example in which the wedge-shaped notch 44 is formed in the core 41a arranged at the laminated side end of the inner stator 40 has been described, but the notch 44 is collectively formed by stacking two or more cores. It may be formed, or the core of the inner stator sandwiched inside may be formed with a notch from the outer peripheral side. However, it is optimal to form a cut in the core of the inner stator at both ends on the stacking side in terms of workability and effect.

The embodiment of FIG. 2 is the same as the embodiment of FIG.
A core 41a in which a core 36 is further arranged at the end portion on the stacking side of the outer stator 30 to form a wedge-shaped notch 44 of the inner stator 40.
It prevents the floating and peeling to the outside. That is, in FIG. 2, the core 36 of the outer stator 30 is a core
Like the core 32a, the core has a tapered notch 35a formed on the outer peripheral side and is located outside the outermost core 41a of the inner stator 40. Therefore, the core 41a floats or peels outward. Can be prevented. Further, since the tapered notch portion 35a is formed, the wedge notch 44 on the inner stator 44 is formed.
It does not hinder the work of forming.

FIG. 3 shows the taper angle of the tapered notch 35b provided on the core 36 of the outer stator 30 arranged at the outermost end in the embodiment of FIG.
It is formed to be larger, and the workability is improved by preventing the processing jig 50 from hitting the core 36 when forming a cut in the inner stator 40.

4 to 5 show a notch formed by fitting the outer stator 30 and the inner stator 40 to the core 32 of the outer stator.
This is an example in which the inner stator 40 is prevented from being displaced in the stator device configured by the core 32 partially formed without forming 31 in the entire radial direction of the core 32.

That is, in this example, since the long core 41a of the inner stator 40 does not appear on the outer periphery of the outer stator 30, the tapered notch portion formed on the outer peripheral side of the core 32 is tapered. And the wedge-shaped notch 44 is formed on the outer peripheral side of the long core 41a of the inner stator as described above.

In this example, the core 38 of the outer stator 30 is further arranged at the end portion on the stacking side, and the core 32 has a core 32.
A tapered notch hole 37b larger than the tapered notch hole 37a formed in the above is formed. Although the core 38 serves to prevent the core 41a of the inner stator 40 from being lifted or peeled off as described above, it is not always essential.

FIG. 6 shows an example in which the inner stator 40 is prevented from being displaced by another structure. That is, in this example, a cutout portion is formed on the outer peripheral side of the core 33c at the end portion on the stacking side of the outer stator 30.
In this example, 33d is provided and the long core 41a of the inner stator 40 is locked by bending the tip thereof. In this example, two cores 33c of the outer stator are arranged and the long core 41a is bent to form the bent portion 45. However, the number of the cores of the outer stator arranged on the outside depends on the strength when bent. Can be selected one after another.

[0026]

In the stator device of the induction motor according to the present invention, since the inner stator is provided with the wedge-shaped notch or the engaging portion formed by the bent portion, the outer stator and the inner stator are securely clamped, and the inner stator is radial direction. Can be prevented.

Therefore, the positional relationship between the outer stator and the inner stator does not change even when the induction motor is shocked or vibrated during assembly or use of the product, and high characteristics can be maintained forever and the induction motor is highly reliable. Can be obtained. As a result, the characteristics and reliability of an electric product using this induction motor can be significantly improved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a sandwiched portion of an outer stator and an inner stator, which is an embodiment of a stator device according to the invention of claim 1;

FIG. 2 is a diagram illustrating an example of a sandwiched portion of a stator device according to a second aspect of the invention.

FIG. 3 is a diagram illustrating an example of a sandwiched portion of a stator device according to a third aspect of the invention.

FIG. 4 is a diagram illustrating an embodiment of the sandwiched portion of the invention of claim 4;

FIG. 5 is a plan view of FIG.

FIG. 6 is a diagram illustrating an embodiment of a sandwiched portion of a stator device according to a fifth aspect of the invention.

FIG. 7 is an exploded perspective view of a stator device that solves a conventional problem.

[Explanation of symbols]

 10 Winding frame 20 Coil 30 Outer stator 31 Notches 32, 33 Core 35 Tapered notch 37 Tapered notch 40 Inner stator 41, 42 Core 44 Wedge notch

Claims (5)

[Claims] 1. A core, which comprises a winding frame formed of a non-magnetic material and around which a coil is wound, and an outer stator and an inner stator sandwiched by the winding frame, wherein the outer stator is a ring-shaped thin plate. And a core having a cutout formed therein, the inner stator is formed of a stack of a long core and a short core that are stick-shaped thin plates, and the inner stator is formed in the cutout of the core of the outer stator. A stator device for an induction motor, wherein a long core of a stator is fitted and the inner stator is sandwiched by the outer stator, wherein at least one outer peripheral end of the long core of the inner stator has a wedge-shaped cut. A stator device for an induction motor, in which a stator is formed. 2. A ring shape of an outer stator, wherein a tapered notch is formed at a laminated end side of a core of the inner stator having the wedge-shaped cut, and at a portion corresponding to the wedge-shaped cut of the inner stator. The stator device according to claim 1, wherein the core is arranged. 3. The tapered notch formed in the core of the outer stator according to claim 2, wherein the tapered notch formed in the core of the outer stator is fitted to the core formed with the wedge notch. The stator device according to claim 2, wherein the stator device is formed with a taper angle larger than the taper angle. 4. The inner stator having the wedge-shaped notch formed therein is sandwiched by a ring-shaped core of an outer stator having a notch hole at a portion corresponding to the wedge-shaped notch of the inner stator. Item 3. The stator device according to Item 1. 5. The induction device according to claim 1, wherein at least one inner stator core having an outer peripheral end bent axially is used instead of the inner stator core having the wedge-shaped cut. Electric motor stator device.