JP2596474Y2 - Fully sealed motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed electric motor, and more particularly to an electric motor having an internal structure which is driven by being connected to a load of a fluid device using an ammonia refrigerant and exposed to the refrigerant atmosphere. More particularly, the present invention relates to a fully-sealed electric motor having a stator wire loop with improved durability.

[0002]

2. Description of the Related Art Conventionally, an induction motor (hereinafter, referred to as an electric motor) driven by being connected to a fluid device using a refrigerant.
In order to prevent the refrigerant from leaking out of the machine, a completely hermetic motor is configured. Fully sealed motors were originally created for submersible pumps, but are now being used to drive refrigerant-using equipment. The internal structure of the electric motor leaks from a rotating shaft portion where the drive shaft and a load device (hereinafter, referred to as a load) are connected and is exposed to a refrigerant filled therein.
Depending on the nature of the refrigerant, it can cause serious obstacles. When the refrigerant used is Freon, the internal structure of the electric motor does not cause any serious trouble, and the internal structure may be opened under a Freon atmosphere. The hermetic motor shown in FIG. Has been used. When ammonia is used as the refrigerant, the internal structure of the hermetically sealed motor is specially made because of the severe corrosiveness of ammonia, and the canned motor shown in FIG. 3 is employed. The internal structure is such that the stator side and the rotor side are separated by the can 9 held by the reinforcing cylinder 15, and the rotating rotor 7 is placed inside the can 9, while the stator core 8 and the stator wire loop are arranged. 4
Is placed on the outside air side of the can 9 so as not to come in contact with the ammonia to protect it from corrosion. In this case, assuming that the stator wire loop 4 is an insulated wire 10 in which the copper wire 11 is covered or molded with an ammonia-resistant resin 16 and only slightly insulated as shown in FIG. If there is something that comes into contact with ammonia from cracks, due to temperature changes that occur inside the structure due to load usage conditions, or due to temperature fatigue of the resin, cracks occur in the resin, or from pinholes once generated,
The copper wire 11 starts to corrode easily, and finally the stator wire 4
Leads to a disconnection state. Therefore, in the canned type,
The can 9 protects the stator wire loop 4 by its structure. The can 9 is generally made of metal, and the can 9 is inserted between air gaps. Due to the increase in the gap or the presence of the alternating magnetic flux due to the stator wire loop, eddy current loss occurs, significantly lowering the motor efficiency. There are problems that general-purpose motors do not have.

[0003]

[Problems to be solved by the present invention] And, in recent years, the use of chlorofluorocarbon has become a social problem with respect to the obstacles to the earth,
While the use of chlorofluorocarbons is becoming increasingly popular, with the increase in electric motor capacity required by industry, cooling measures to be taken in response to an increase in the temperature inside the drive electric motor are becoming more difficult due to the above-mentioned problems. Therefore, if it is possible to solve the technical problem to ammonia, to solve the corrosion problem of the difficulty and the internal structure of a cooling measures, and the problems of the motor efficiency and the like found in the above-mentioned scanning de <br/> type, internal By simplifying the structure, it is possible to provide a fully-sealed motor connected to a refrigerant-using device at the same technical level as a general-purpose motor. If the level of technical problems of the hermetically sealed motor can be attained to the level of general-purpose motors, it will be possible to socially respond to the demand for measures against CFC regulations and to increase the motor capacity of the industrial world.

[0004] That is, as one of the technical solutions to the social demands, it has been used exclusively for CFC refrigerants.
There is a problem in that a hermetic type electric motor having a simple structure can be converted to an ammonia refrigerant and has a structure having corrosion resistance or durability against ammonia. In addition to solving this problem, it is necessary to manufacture a hermetically sealed electric motor at low cost in order to spread the general-purpose type.

[0005] The purpose of the present invention is to address the shortcomings of the prior art.
A hermetic motor having a stator wire loop under a refrigerant atmosphere, even in a hermetic motor having a simple structure, while aiming for a configuration capable of realizing conversion of ammonia refrigerant,
An object of the present invention is to provide a fully-sealed electric motor that can be easily cooled and can be manufactured at low cost.

[0006]

According to the present invention, the schematic structure of the hermetic motor is the same as that of the prior art, but the surface of the copper wire is coated with aluminum metal as shown in FIG. And applying an ammonia-resistant insulating layer on the surface thereof, providing an insulating coating layer on the surface of the insulating layer, and further covering the surface of the insulating coating layer with an ammonia-resistant resin. Wherein the stator wire loop provided with is wound around a fixed iron core of the electric motor.

[0007]

According to this technical means, when the stator wire loop of the electric motor is subjected to a temperature change as in the prior art, the resin or paint covering the copper wire is peeled off from the copper wire or the resin is cracked. Instead of a completely hermetic electric motor having a structure that does not have a structure, the present invention covers the stator wire loop of the electric motor by first coating the copper wire with aluminum that is not affected by ammonia gas, liquid, lubricating oil and the like. Second, an ammonia-resistant insulating layer is applied to the aluminum surface, and an insulating coating layer is provided on the surface of the insulating layer, or the surface of the insulating coating layer is further coated with an ammonia-resistant resin. However, since it is a fully-sealed motor in which a stator wire having been subjected to an ammonia-resistant treatment is wound around a stator core, the stator wire has high electrical insulation, and Third is the core wire And lines, and configured to cover the aluminum in which the electrical conductivity does not change significantly, without inhibiting the function of the stator wire wheels, the anti-ammoniacal Mie
While to achieve the, not intended to inhibit the conventional manner complete sealing structure Fourth, also the outer shell structure of the motor such as a motor frame, it holds pressure resistance, air tightness, inside the There is no leakage of refrigerant or the like outside the machine. Further, when the surface of the coated aluminum of the stator wire is subjected to anodizing, unlike the insulating coating process, the aluminum and the anodized layer are integrally formed to form a coating that does not peel off. Thus, the stator wire loop has an ammonia resistance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention to only those components, unless otherwise specified. It's just

[0009] FIG. 1 (A), cutaway side view of a hard <br/> Mechikku electric motor according to an embodiment of the present invention, (B) is a stator wire wheels
First Embodiment FIG., (C) is a main part perspective view of the stator wire wheels, 1
Reference numeral denotes a load which is a fluid device such as an ammonia compressor or an ammonia pump, and reference numeral 2 denotes a hermetic type hermetically sealed electric motor. The motor 2 has one end connected to the load 1 via a bearing (not shown), and the other end connected to a drive shaft 5 rotatably fitted to a bearing 6 fitted to an outer shell of the motor. A rotor 7 is fixedly mounted, and a stator core 8 is provided inside the outer shell so as to face the rotor 7 via an air gap.
However, the stator wire loop 4 is wound and disposed.

[0010] The stator wire loop 4 comprises a copper wire 11 as a core wire,
The copper wire 11 is constituted by an insulated wire 10 formed by forming an aluminum coating material 12 having a surface subjected to ammonia-resistant electrical insulation treatment. The ammonia-resistant electrical insulation treatment is performed by alumite treatment or ammonia-resistant insulation coating treatment. The coating of the copper wire 11 with the aluminum coating material 12 is performed by a conventional technique such as a process of depositing aluminum metal on the copper wire, pressure welding or crimping of a tube material. On the other hand, the insulation coating process is performed by coating or baking on the target coated surface. The interior of the electric motor 2 is in communication with the load 1 via the connection portion (not shown), so that an ammonia atmosphere state is possible. The internal ammonia is prevented from leaking outside due to the robust structure of the outer shell.

[0011] Note that the stator wire wheel 4 interconnections connects the copper wire 11 mutual core, this was subject to withstand ammonia electrical insulating treatment, an insulated wire further leading to the outside from the stator wire wheels 4 In the same manner as described above, the connection portions and terminals of the copper wire 10 are formed in a structure in which the surface of the copper wire 11 is covered with an aluminum metal material and subjected to an ammonia-resistant electrical insulation treatment.

FIG. 2A is a cross-sectional view of a main part of a second embodiment of a stator wire loop, FIG. 2B is a cross-sectional view of a main part of an embodiment according to the present invention, and FIG. (A) or (B), a stator wire loop 4 wound around the stator core 8 inside the electric motor 2, a copper wire 11 as a core wire, and the copper wire 11.
An aluminum coating material 12 whose surface has been subjected to anodizing treatment, the surface of which is subjected to an insulating coating treatment 13, and furthermore, the surface of the insulating coating treatment 13 is coated with a conventional ammonia-resistant resin 16. , Forming a multi-layer coating structure.

Next, the behavior of the present invention during load operation will be described. When the drive shaft 5 of the electric motor 2 connected to the load 1 via a bearing is driven and rotated, the ammonia refrigerant leaks to the electric motor side through the gap between the bearing and the drive shaft 5 together with the lubricating oil. Each time the refrigerant rotates, the refrigerant also enters the inside of the stator core 8, and the entire internal structure of the electric motor 2 together with the stator wire 4 is exposed to an ammonia atmosphere. However, in the present invention, under the atmosphere,
The stator wire loop 4 mainly composed of the copper wire 11 affected by ammonia is provided with an ammonia-resistant electric insulation treatment on the outside in a one-layer or two-layer structure, and further covered with aluminum metal. The motor 2
By forming a structure resistant to the ammonia, the electric conductivity of the aluminum used and the hermetic structure having a simple structure with no heat generation and no generation of eddy current loss increase the motor efficiency. Durable and continuous operation can be performed without any loss. As a result, unlike the structure of the can-type electric motor, there is no need to encounter complicated configurations and technical problems caused thereby.

[0014]

As described above, according to the present invention, the stator wire loop which has been conventionally affected by ammonia corrosion is subjected to multiple ammonia-resistant electrical insulation treatments to protect the copper wire used. By constructing a fully hermetic motor, it solves the conventional technical problems such as corrosion phenomena in a refrigerant atmosphere and durability, and has a simple, heat-generating element that does not impair motor efficiency. It has various remarkable effects, such as presenting technology for constructing a fully-sealed electric motor with an internal structure that allows for an increase in electric capacity. This makes it possible to provide a general-purpose, fully-sealed electric motor for driving ammonia-using equipment, and its practical value is extremely large.

[Brief description of the drawings]

1A is a cutaway side view of a hermetic motor according to an embodiment of the present invention, and FIG. 1B is a first embodiment of a stator wire loop;
An example figure and (C) are the principal part perspective views of a stator wire loop.

2A is a cross-sectional view of a main part of a second embodiment of a stator wire loop, FIG. 2B is a cross-sectional view of a main part of an embodiment according to the present invention, and FIG.
FIG. 3 is a perspective view of a main part of (A) or (B).

FIG. 3 is a cutaway side view of a canned electric motor illustrating a conventional technique.

FIG. 4 is a sectional view of a main part of a stator wire loop of an electric motor for explaining a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load, (fluid equipment, etc.) 2 Hermetic motor 4 Stator wire 8 Stator core 10 Insulated wire 11 Copper wire 12 Aluminum metal coating material 13 Insulation coating

Claims (1)

(57) [Scope of request for utility model registration] 1. A fully-sealed electric motor for driving a device using ammonia, wherein the surface of a copper wire is coated with aluminum metal, and the surface of the copper wire is coated with an ammonia-resistant insulating layer, and the surface of the insulating layer is insulated. A coating layer is provided, and the surface of the insulating coating layer is coated with an ammonia-resistant resin, and the stator wire having been subjected to the ammonia-resistant treatment is wound around a fixed core of the electric motor. Fully sealed motor.