JPH035142B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a molded motor used as an underwater motor used in a well or the like.

[Prior art]

The conventional submersible motor was the Special Publication No. 47-11850.
As disclosed in the publication, a structure called a cand type as shown in FIG. 1, that is,
The outer periphery of the stator 1 is covered with a stainless steel frame 101.
A structure is known in which the inner periphery of the stator 1 is covered with a thin stainless steel can 3, and water (antifreeze) for lubricating the thrust bearing 16 is filled in the can.

However, although this type of canned motor has good electrical insulation of the stator coil, it also has a collar 1 for sealing the ends of the frame 101 and the can 3.
02 is required, so the collar 102 and frame 1
It is necessary to machine the spigot fitting part of the 01 end and the spigot fitting part of the collar 102 and the brackets 12, 13, and it is also necessary to assemble these parts, which has the disadvantage of increasing manufacturing costs.

Therefore, as a countermeasure to this problem, there is a method in which the stator core and stator coil are molded with a resin mold member, as disclosed in Japanese Utility Model Application No. 55-56457, but with this structure, the strength It was necessary to make the mold member thicker, which led to larger sizes, especially in those with a long stator core width. In addition, as a countermeasure for this, for example,
As disclosed in Publication No. 119601, a configuration in which a cylinder is arranged around the outer periphery of the stator core is also considered, but
This configuration has a problem in that the diameter of the stator increases by the thickness of the cylinder.

[Summary of the invention]

This invention was made with the aim of improving these drawbacks, and involves fitting a compression member that is longer than the lamination length of the stator core into a compression groove provided on the outer surface of the stator core, and then forming the resin mold. The present invention proposes a molded motor that can improve the bending strength and tensile strength of the stator with a simple structure by molding the stator core without increasing the diameter of the stator core.

[Embodiments of the invention]

The figures will be explained below. In FIGS. 2 to 4, reference numeral 1 denotes a stator consisting of a stator core 2 and a stator coil, and a thin stainless steel can 3 is inserted into the inner periphery of the stator. Note that a dovetail-shaped compression groove 201 is provided on the outer surface of the stator core 2, and a compression fitting 202 constituting a compression member that is longer than the lamination length of the stator core is installed in the groove. It is fitted. In other words, the compression fitting 202 is fitted so as to protrude to approximately the center of the coil end 5 in the axial direction. Reference numeral 4 denotes a resin mold member made of polyester resin or vinyl ester resin that surrounds the outer periphery and sides of the stator core 2, the coil end 5 of the stator coil, and the compression fitting 202. 6 is a plurality of screws embedded in the resin mold member 4 for tightening brackets 12 and 13, which will be described later; 7 is a terminal block to which a power supply cable 8 is detachably connected; It is buried. 9 is a rotor,
It is composed of a rotor shaft 10, a rotor core 11, and the like. 12 and 13 are brackets fixed within the resin molded member 4, and the sleeve bearing 1
The rotor shaft 10 is supported via 4 and 15. 16 is a thrust bearing, and 17 is an internal pressure adjustment device. Note that an antifreeze solution such as propylene glycol is sealed inside the can 3.

[Effects of the present invention]

As described above, in this invention, the compression metal fittings protruding almost to the axial center of both coil ends are fitted into the dovetail-shaped compression grooves of the stator core, and are integrally molded. This structure simply increases the length of the compression fittings conventionally used for fixing the stator, without increasing the diameter of the stator.
With an extremely simple configuration, the bending strength and tensile strength of the entire stator including the resin molded member can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a canned submersible motor, FIGS. 2 to 4 are related to an embodiment of the present invention, FIG. 2 is an overall sectional view, and FIG. 3 is an enlarged sectional view of a stator. FIG. 4 is a sectional view taken along the line AA in FIG. 3. Note that the same reference numerals in the figures indicate the same parts. 1 is a stator, 2 is a stator core, 201 is a compression groove, 202 is a compression fitting, 3 is a can, 4 is a resin mold member, and 5 is a coil end.

Claims (1)

[Claims] 1 In a structure in which the outer peripheries of the stator core and stator coil are integrally molded with a resin molded member, a dovetail-shaped compression groove provided on the outer surface of the stator core is provided with a dovetail-shaped compression groove approximately at the axial center of both coil ends. A molded motor characterized in that a compression fitting having a length that protrudes to the vicinity is fitted and integrally molded with the resin molding member.