JPS6152131A - Canned motor - Google Patents

Abstract

PURPOSE:To enable the butted section of a can to be exactly positioned in a slot opening section, by a method wherein a tongue in the axial direction including the butted section of the can is formed on the can and wherein the tongue is positioned in the slot opening section of a sensor. CONSTITUTION:When a can 21 is inserted in a stator 1, the can 21 is fitted by fitting th primary tongue 21a in a slot opening section 1c. Then, the can 21 and the stator 1 are prevented from being relatively rotated due to the primary tongue 21a, and a butted section 21b is exactly positioned in the slot opening section 1c and is prevented from shifting to the inner circumference of a slot tooth 1f. As a result, the stator 1 can be exactly prevented from coming in contact with a rotor.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to improvements in canned motors.

[Prior art]

A conventional electric motor of this type, ie, the electric motor disclosed in Japanese Utility Model Application Publication No. 55-25779, will be explained with reference to FIG. In the figure, 1 is a stator composed of a stator inner periphery 1a and a stator coil 1b, 2 is a cylindrical stator frame made of stainless steel plate that supports the stator 1 at the inner periphery, 3.4
Reference numeral 5 indicates a collar constructed of stainless steel plate end plates welded to both ends of the stator frame 2 in the axial direction, 5 a can that fits into the inner periphery of the stator 1, and both ends of which are welded to the collar 3.4; A stainless steel bracket 1-18 is attached to the bracket 3 by a stainless steel bolt 7, and a sealing gasket 9 is inserted between the bracket 6 and the bolt 7.
11 is a stainless steel bracket attached to the collar 4 by a stainless steel 7Iζ bolt 10; 11 is a sealing gasket attached between the bracket 9 and the bolt 10; 12.
13 is a radial bearing mounted correspondingly on the bracket 6.9, 14.15 is a thrust bearing correspondingly mounted on the axially inner end of the bracket 6.9, 16 is a rotor paired with the stator 1, and 17 is a rotor. 16 is a stainless steel shaft rotatably supported by a bearing 12.13, and 18.19 is a thrust disk mounted on the shaft 17, which forms a pair with the thrust bearing 14.15. . Reference numeral 20 denotes a shaft seal which is detachably attached to the bracket 9.

In a bicycle constructed as described above, the can 5 is generally a flat plate rolled into a cylindrical shape, and the abutting portions are welded. Furthermore, a cylindrical can 5 is fitted into the stator 1 and a collar 3.4 is welded to each end thereof.

However, the butt part of the can 5 tends to be thicker than other parts, and when the rotor 16 is placed inside the can 5, the inner periphery of the can 5 (the outer periphery of the rotor 16 comes into contact with the There was a problem in that the life of the bearings 12, 13 and the shaft seal 20 was shortened due to the powder.

I'm waiting for seam welding of the butt part of can 5,
Since the butt parts are overlapped, not only the wall thickness becomes large, but also the ends of the butt parts warp due to seam welding, so the actual thickness becomes large, and the can 5
There is a drawback that there is a high risk of contact with the rotor 6.

[Summary of the invention]

This invention has been made to solve the above-mentioned drawbacks, and by forming an axial protrusion on the can, including the abutting portion of the can, and positioning this protrusion within the slot opening of the stator, the can can be To provide a canned motor in which an abutment part can be reliably positioned within a slot opening and contact between a can and a rotor can be reliably prevented.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In the figure, IC is a slot opening of the stator core 1a, 1d is a wedge that insulates the stator coil 1b, and 21 is a can that is fitted into the inner circumference of the stator 1 and welded at both ends to the collar 3.4. The abutting portion 21b is fixed by seam welding, and a first protrusion 21a is formed in the axial direction of the abutting portion 21b to be positioned within the slot opening IC. There is.

In the structure configured as described above, when inserting the can 21 into the stator 1, the first protrusion 21a is aligned with the slot opening IC, and the can 21 is engaged.

Here, the first protrusion 21a prevents relative rotation between the can 21 and the stator 1, and the abutting portion 21b is reliably positioned in the slot opening IC. Shifting toward the inner circumference of the tooth 1f is suppressed. Therefore, the inner circumference of the can 21 and the rotor 6
contact is prevented. On the other hand, since the first protrusion 21a contacts the inner wall of the slot opening 1 and the wedge 1d in the stator core 1a, relative movement in the axial direction is also suppressed. The can 21 has a first protrusion 2 which allows liquid to be poured into the testator 1 through the collar 3 or 4.
When the can 1a passes through the brim 3 or 4, the entire can 21 deforms with elasticity, but when it passes through the brim 3 or 4, it protrudes again with elasticity, and the first protrusion 2 at the time of insertion
Deformation of 1a itself is suppressed.

Figures 4 and 5 show other embodiments of the invention of B, in which 21d is provided parallel to the first protrusion 21a on both sides thereof, and the first protrusion 21m is filled with liquid. A slot opening other than slot opening IC, that is, slot opening I
A pair of second protrusions are filled into the slot openings 1e on both sides of C.

In this configuration, when the can 21 is inserted, the can 21 configured in a thin cylindrical shape has the first protrusion 21a and the second protrusion 21a.
The protrusions 21d will be filled with liquid into the slot openings 1c and le, respectively, thereby ensuring that the protrusions 21a and 21 are filled with liquid.
d is filled into each slot opening 1c11e. In other words, in the case of only the first protrusion 21a, since the can 21 has a thin cylindrical shape, it is highly elastic, and when the first protrusion 21& is inserted into the slot opening 1c in the middle of filling the liquid, However, by providing the second protrusion 21d, a plurality of protrusions can be fitted into slot openings at a plurality of locations at the same time. It is possible to reliably prevent the can 21 from shifting in the circumferential direction when liquid is injected, and since there are a plurality of protrusions, the vicinity of the first protrusion 21a is similar to that of the second protrusion 2.
1d, and from this point as well, it is possible to reliably prevent the can 21 from shifting in the circumferential direction when the first protrusion 21a is filled with liquid into the slot opening 1c.

Also, the displacement of the can 21 in the axial direction can be reliably suppressed, and the welding work between the can 21 and the collar 3.4 becomes easier. In other words, since a plurality of protrusions are formed, the slot opening 1c.

Each of the protrusions 21a and 21d comes into contact with the inner wall 1e in a relatively pressed state, and positioning in the circumferential direction and the axial direction is performed by the protrusions.

〔Effect of the invention〕

As described above, the invention of B forms an axial protrusion on the can that includes the butt part of the can, and this protrusion is positioned inside the slot opening of the stator, so that the welded part at the butt part of the can is securely secured. This has the effect of reliably preventing contact between the stator and rotor. Further, in another invention, a second protrusion is provided adjacent to the first protrusion, and liquid is filled in the slot opening of each of the second protrusion, so that the can can be inserted into the stator. When doing so, each protrusion can be reliably filled with liquid into each slot opening, and it is possible to easily prevent misalignment between the stator and the can during assembly, which has the effect of improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional device, FIG. 2 is a sectional view of essential parts showing an embodiment of the present invention, FIG. 3 is an enlarged sectional view of the can shown in FIG. 2, and FIG. FIG. 5 is an enlarged sectional view of the can shown in FIG. 4. In the figure, 1 is a stator, 1c and le are slot openings, 2 is a stator frame, 21 is a can, 21m is a first protrusion, 21b is a butt portion, and 21d is a second protrusion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (5)

[Claims] (1) A cylindrical stator frame that surrounds the stator, a can that is formed into a cylindrical shape by welding the abutting part and is fitted to the inner periphery of the stator, and the abutting part of the can, and the stator A canned motor having an axial ridge located within the slot opening of the motor. (2) The canned motor according to claim 1, wherein the abutting portions are overlapped and the overlapped portions are seam welded. (3) A cylindrical stator frame that surrounds the stator, a can that is formed into a cylindrical shape by welding the abutting portion and is fitted to the inner periphery of the stator, and a can that includes the abutting portion of the can and that a first axial ridge located in the slot opening; and a second axial ridge formed in the can and located in another slot opening adjacent to the slot opening in which the first ridge is located. A canned motor with two protrusions. (4) The canned motor according to claim 3, wherein the abutting portions are overlapped and the overlapped portions are seam welded. (5) The second protrusion is parallel to the first protrusion.
The canned motor according to claim 3 or 4, wherein the canned motor is formed on both sides of the protrusion.