JPS602044A - Molded submerged motor - Google Patents

Abstract

PURPOSE:To improve a corrosion resistance and productivity and reduce a size and weight by a method wherein the outside circumference of a coil, a core and a slot part of a stator is molded with a thermosetting resin and a low moisture permeability plastic layer is provided to the circumference of the thermosetting resin layer. CONSTITUTION:A molded layer 3 is solidly molded with a thermosetting resin material such as a phenol resin, an epoxy resin and a non-saturated polyester resin. The outside circumference of the molded layer 3 is covered with a moisture shielding layer 4 of a low moisture permeability plastic to protect an internal coil 1 from external moisture. With this constitution, deterioration of insulation life and a mechanical strength due to the water penetration is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a submersible electric motor, and particularly to improvements to improve corrosion resistance and productivity, and to achieve smaller size, lighter weight, and lower cost.

In recent years, transformers, current transformers, switches, and capacitors using thermosetting molding materials have been developed to improve the productivity and functionality of electrical equipment.

Transistors and small electric motors are produced here. For example, in small electric motors of 100W class or less, some of the stator core and coils are molded using Molding Com.
Pounds) are integrally molded by transfer molding or injection molding using a thermosetting molding material such as phenol resin or epoxy resin.

On the other hand, in submersible electric motors that are used underwater, there are problems with the moisture permeability of plastic, a reduction in insulation life, and a reduction in mechanical strength due to underwater use. Submersible electric motors have not been proposed.

Therefore, an object of the present invention is to provide a completely molded underwater electric motor, and the underwater electric motor according to the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a sectional view of essential parts of an embodiment of a molded submersible electric motor according to the present invention, particularly showing a stator section. In the figure, 1 is a coil, which is wound around a core 2. 3 is a mold layer, which is integrally molded from a thermosetting resin material such as phenol resin, epoxy resin, or unsaturated polyester resin. 4 is a water-blocking layer made of low moisture permeability plastic such as polyethylene or polypropylene, and by covering the outer peripheral surface of the mold layer 3,
The coil 1 provided inside is protected from outside water. 5 is a can, and 6.7 is an insert screw and an airtight terminal provided in the mold layer 3.

The underwater electric motor configured in this way has a coil 1 and a core 2.
And the slot part is made of phenolic resin.

The molded stator is integrally molded using a thermosetting material such as epoxy resin or unsaturated polyester resin, and then covered with a low-moisture-permeable plastic around its outer periphery to form a molded stator with an integral structure and waterproof properties. In order to be
A decrease in insulation life and mechanical strength due to moisture permeation is prevented.

Next, a life estimation test of the molded stator with the above configuration will be explained. Figure 2 shows a molded magnet twisted pair with an insulation structure almost equivalent to that of the actual machine used in the life estimation test. The mold layer 12 is cotton made of two twisted magnet wires, and 13 is a low moisture permeability plastic layer such as polyethylene or polypropylene covered on the surface of the mold layer 12, and its thickness is approximately Q, 5 tryn.
is set to . a indicates the distance between the magnet wire and the outside water during the trial run, and is set to be the same as the thickness of the mold layer 3 in the actual machine, so that an evaluation equivalent to that of the actual machine can be obtained when estimating the charged insulation life in water. It looks like it's going to happen.

FIG. 3 is a sectional view of a main part of a test device for estimating the life of a two-strand twisted test piece of the molded magnet wire. In the figure, 15 is a molded magnet wire twisted pair, 16 is a water tank that accommodates this molded magnet wire twisted pair, and 17 is a water tank that is fed into the water tank 16 via a water pipe 18 and then discharged via a drain pipe 19. 21 is a magnet wire, and 22 is putty to prevent hot water from leaking.

Using such a device, when 200 to 700V is applied between magnet wires 9 and 21, 60 to 700V is applied between magnet wires 9 and 21.
When testing the characteristics of V- without circulating hot water at 80 DEG C., the results shown in FIG. 4 were obtained. In the same figure, A represents the characteristic of v- when the outer periphery of the magnet wire is molded and the outer periphery is covered with a low moisture permeable glass layer, and straight line B represents the twisted pair of magnet wire alone. v- in is a characteristic. As is clear from FIG. 4, it is clear that the combination of the mold layer and the low moisture permeability plastic layer such as polyethylene, polypropylene, etc. will result in a sufficiently longer life span than when the wire is used alone.

As explained above, the molded submersible electric motor according to the present invention integrates the outer periphery of the stator coil, core, and slot portion by molding with thermosetting resin, and the outer periphery is made of polyethylene, polypropylene, etc. It has an excellent effect that can be easily obtained by providing a low moisture permeability plastic layer.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing one embodiment of a molded submersible motor according to the present invention, and Fig. 2 is a molded magnet wire equivalent to the molded submersible motor: coil, 2, core, 3, mold. &, 4...Low moisture permeability plastic layer, 5...Can, 6...insert screw, 7...
・Airtight terminal. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (2 others) Ichi ℃ Corpse 2 at 3 Amendment to intestinal procedure (voluntary) Showa 5 e! November 4, 2016, the Office of the Director-General's Palace, 1, Indication of the case, Patent Application No. 1986-108624, 2, Name of the invention, Molded Submersible Electric Motor 3, Relationship with the person making the amendment, Patent Applicant's address, 2-chome Marunouchi, Chiyoda-ku, Tokyo. 2nd and 3rd name
(601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent 5, Subject of amendment (1) Detailed explanation of the invention in the specification column 6, Contents of amendment (1) Page 3, line 1 of the specification The word ``material'' means ``molding material.''
and correct it. (2) On page 4, line 4, the text ``Soton'' is corrected to ``Tensen.'' (3) On page 4, line 9, "mold layer" is corrected to "mold layer of coil section." (4) Page 5, line 2, “added” was replaced with “applied”
and correct it. 211

Claims (1)

[Claims] It has a mold layer made of a thermosetting resin material that covers and integrates the surfaces of the coil, core, and slot portions that make up the stator of the underwater motor, and a low moisture permeability plastic layer provided around the outer periphery of this mold layer. A molded underwater electric motor characterized by: