JPS6152129A - Canned motor - Google Patents

Abstract

PURPOSE:To prevent a can from coming in contact with a rotor, by forming a tongue as a part in the axial direction of a slot opening section and positioning the tongue in the slit opening section. CONSTITUTION:When a can 21 is inserted in a stator 1, the can 21 is fitted by fitting a 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 tongue 21a, and a butted section 21b is exactly positioned by the slot opening section 1c and is prevented from shifting to the inner circumference of a slot tooth. As a result, the inner circumference of the can 21 is 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 kind, ie, the electric motor disclosed in Japanese Utility Model Application Publication No. 55-25779, will be explained with reference to FIG. In the figure, l is a stator composed of a stator core 1a and a stator coil 1b, 2 is a cylindrical stator frame made of a stainless steel plate that supports the stator 1 on its inner circumference, 3.4
5 is a collar made of stainless steel end plates welded to both ends of the stator frame 2 in the axial direction, 5 is a can that is injected into the inner periphery of the stator 1, and both ends are welded to the collars 3.4; 6 A stainless steel bracket attached to the hub 3 with a stainless steel bolt 7, 8 a sealing gasket inserted between the bracket 6 and the bolt 7, 9 a stainless steel bracket attached to the hub 4 with a stainless steel bolt 10. Steel bracket, 11 is bracket 9 and bolt 1o
12 and 13 are radial bearings installed in correspondence with brackets 6 and 9;
．． Reference numeral 15 denotes a thrust bearing mounted correspondingly on the axially inner end of the bracket 6.9, 16 a rotor opposite to the stator 1, 17 supporting the rotor 16, and bearing 12.1.
18. a stainless steel shaft rotatably supported at 3;
A thrust disk 19 is attached to the shaft 17 and is paired with thrust bearings 14 and 15. 20 is a shaft seal detachably attached to the bracket 9.

In the configuration as described above, the can 5 is generally a flat plate rolled into a cylindrical shape, and the abutting portions are welded. Further, the cylindrical can 5 is fitted into the stator 1, and has a collar 3.4 at each end. However, the abutting portion of the can 5 tends to be thicker than other parts, and When the rotor 16 is placed inside, the outer circumference of the rotor 16 comes into contact with the inner circumference of the can 5, and the abrasion powder causes damage to the bearing 12.1.
3 and the shaft seal 20 have a shortened lifespan.

In particular, when the butt parts of the can 5 are seam welded, since the butt parts are overlapped, the wall thickness increases. This has the disadvantage that the thickness is substantially increased, and there is a greater possibility of contact between the can 5 and the rotor 6.

[Summary of the invention]

This invention has been made to solve the above-mentioned drawbacks, and includes forming an axial protrusion on the can that includes the abutting part of the can, and forming the protrusion on the axial part of the slot opening of the stator. By forming this protrusion on a part of the slot opening in the axial direction and positioning this protrusion within the slot opening, the abutting part of the can can be reliably positioned within the slot opening, and the can and rotor can be To provide a canned motor that can reliably prevent contact with the motor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. 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 filled with liquid into the inner circumference of the stator 1 and whose both ends are welded to the collar 3.4. The abutting portion 2To is fixed by seam welding, and a stone protrusion 21a is formed in the axial direction of the abutting portion 21b, which is positioned within the slot opening 1C.

Note that the protrusion 21a is formed along at least substantially the entire length of the slot opening IC in the axial direction.

In the structure configured as described above, when inserting the can 21 into the stator 1, the protrusion 21a is aligned with the inside of the slot opening IC, and the can z1 is fitted.

Here, the protrusion 21a prevents relative rotation between the can 21 and the stator 1, and the abutting part 21b is reliably positioned in the slot opening IC, so that the abutting part 21b is connected to the tooth 1 of the slot. The shift towards the inner circumference of the sun should be suppressed. Therefore, contact between the inner circumference of the can 21 and the rotor 6 is prevented.

On the other hand, since the protrusion 21a also contacts the inner wall of the slot opening IC and the wedge 1d inside the stator cob 11a,
Relative movement in the axial direction is also suppressed. Note that the can 21 is inserted into the stator 1 through the inside of the collar 3 or 4, and when the protrusion Zla passes through the inside of the collar 3 or 4, the entire can 21 deforms with elasticity. Or, after passing through 4, it will protrude elastically again, and the deformation of the stone protrusion zla itself during insertion is suppressed.

Here, the protrusion 21 is formed on the can 21 to correspond to at least the entire axial length of the slot 114 opening IC, and the portion of the abutting portion 21b facing the rotor 16 is located within the slot opening IC. In addition, the warp 21e generated in the butt portion 21b during seam welding
will be formatted as shown in Figure 4, so Can 2
This means that contact between the butt portion 21b of No. 1 and the rotor 16 can be reliably prevented.

〔Effect of the invention〕

As described above, the present invention forms an axial protrusion on the can that includes the abutting part of the can, and forms the protrusion on a part of the slot opening of the stator in the axial direction. Since the welded portion at the abutting portion of the can can be reliably positioned within the slot opening, there is an effect that contact between the stator and rotor can be reliably prevented.

Moreover, all butting parts of the can facing the rotor are located within the slot opening, and the warpage in seam welding at that part is corrected, making the contact prevention effect between the rotor and the can extremely reliable. There is an effect that will make you do so.

[Brief explanation of drawings]

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 of Fig. 2, and Fig. 4 is a sectional view of the can of the present invention. FIG. 5 is an enlarged sectional view showing the positional relationship between the stator and the can of the present invention. In the figure, 1 is a stator, lc is a slot opening, 2 is a stator frame, 21 is a can, 21& is a protrusion, and 21b is an abutting portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[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 1. A canned motor comprising an axial protrusion located within a slot opening of the key, the protrusion being formed over substantially the entire length of the slot opening. (2) The canned motor according to claim 1, wherein the abutted portions are overlapped and the overlapped portions are seam welded.