JPH0567165U - Fully sealed electric motor - Google Patents

Abstract

(57) [Abstract] [Purpose] Having a stator coil for durability, which is an electric motor with an internal structure that is hermetically connected to a fluid device and drives it to be exposed to an ammonia atmosphere. To provide a fully sealed electric motor that generates less heat. [Structure] A fully sealed electric motor for driving equipment using ammonia, a copper wire is coated on the surface with an aluminum metal, and a stator wire wheel whose surface is subjected to an ammonia-resistant electrical insulation treatment is used as the fixed iron core of the electric motor. The winding is performed, and the insulating treatment is an alumite treatment or an ammonia-resistant insulating coating treatment to form the structure of the fully sealed electric motor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hermetically sealed electric motor, and particularly, the durability of the electric motor having an internal structure which is driven by being connected to a load such as a fluid device using ammonia refrigerant and exposed to the refrigerant atmosphere. The present invention relates to a totally sealed electric motor having a stator wheel.

[0002]

[Prior Art]

 Conventionally, an induction motor (hereinafter referred to as an electric motor) that is driven by being connected to a fluid device that uses a refrigerant is configured as a hermetically sealed electric motor in order to prevent the refrigerant from leaking outside the machine. Originally made for submersible pumps, fully enclosed electric motors have come to be used for driving equipment using refrigerant. The internal structure of the electric motor leaks from the rotating shaft that connects the drive shaft and the load device (hereinafter referred to as the load) and is exposed to the refrigerant that fills the inside. Bring When the refrigerant used was Freon, the internal structure of the electric motor was not seriously impaired, so that the internal structure may be opened under the Freon atmosphere. The hermetic type shown in FIG. Electric motors have been used. When ammonia is used as the refrigerant, the internal structure of the fully sealed electric motor is specially made because of the severe corrosiveness of ammonia, and the can electric motor shown in FIG. 3 is adopted. The internal structure is divided by the can 9 held by the reinforcing tube 5, and the rotating rotor 7 is placed inside the can 9, while the stator core 8 and the stator coil 4 are not touched by the ammonia. It is placed on the outside of the can 9 to protect it from corrosion and protect it. It is assumed here that the stator coil 4 is an insulated wire 10 in which the copper wire 11 is coated or molded with an ammonia resistant resin 16 and is simply subjected to insulation treatment as shown in FIG. If the cracks come into contact with ammonia, they can easily be cracked in the above-mentioned resin due to temperature changes inside the structure due to load usage conditions, or due to pinholes etc. The copper wire 11 begins to corrode, and the stator coil 4 is finally broken. Therefore, in the can type, the can 9 protects the stator coil 4 by its structure, but the can 9 is generally metallic and the can 9 is made of air. It is provided by inserting it between the gaps, and the gap increases over time, and due to the presence of alternating magnetic flux due to the stator coil, eddy current loss occurs and the efficiency of the motor is significantly reduced. The amount of heat is hard to ignore, and there are problems, such as cooling measures, that general-purpose electric motors do not have.

[0003]

[Problems to be solved by the device]

 However, in recent years, while the use of CFCs has become a social issue about the obstacles to the earth, and restrictions on the use of CFCs have increased, cooling that is performed in response to the rise in temperature inside the drive motor due to the increase in motor capacity due to industrial demand Countermeasures are becoming increasingly difficult due to the existence of the above problems. Here, if the technical problems with ammonia can be solved, the problems of refrigeration measures, the corrosion problem of the internal structure, and the problems such as the electric motor efficiency found in the can type described above will be solved, and the internal structure will be improved. It is possible to provide a fully sealed electric motor that is connected to devices using a refrigerant and that has the same technical level as a general-purpose electric motor. If the level of technical problems of the fully sealed electric motor can be made equal to that of general-purpose electric motors, it will be possible to socially meet the demands for CFC regulation measures and the increase of electric motor capacity in the industrial world.

That is, as one of the technical solutions to the social demand, a hermetic electric motor having a simple structure, which has been conventionally exclusively used for a CFC refrigerant, can be converted into an ammonia refrigerant, which can be converted to an ammonia refrigerant. The problem is to have a structure with corrosion resistance or durability. In order to solve this problem and bring it to the level of popularization of general-purpose type, it is also necessary to manufacture a fully sealed electric motor at low cost.

In view of the drawbacks of the prior art, it is an object of the present invention to realize conversion of ammonia refrigerant even in a hermetic motor having a simple structure having a hermetically sealed electric motor having a stator coil in a refrigerant atmosphere. It is an object of the present invention to provide an all-sealed electric motor that is easy to cool and can be manufactured at low cost while achieving a possible structure.

[0006]

[Means for Solving the Problems]

 The present invention is similar to the conventional invention in the general structure of the hermetic motor, but as shown in FIGS. 1 and 2, first, the surface of a copper wire to be a conductor is coated with an aluminum metal. At the same time, the stator coil, whose surface has been treated with ammonia-resistant electrical insulation, is wound around the fixed iron core of the motor.

Secondly, the insulation treatment is an alumite treatment or an ammonia-resistant insulation coating treatment. The ammonia-based insulating coating treatment may be performed on the alumite treatment to double-coat the coating. Furthermore, the surface of the above-mentioned final treatment can be coated with a conventional resin material and the triple protection treatment can be appropriately selected and determined to be an embodiment of the present invention.

[0008]

[Action]

 According to such a technical means, when the stator coil of the electric motor is subjected to a temperature change as in the conventional invention, the resin or paint coating the copper wire peels from the copper wire or the resin cracks. The present invention is not a totally sealed electric motor with a structure.In the present invention, the stator ring of the electric motor is first covered with copper wire coated with aluminum that is not violated by ammonia gas, liquid or lubricating oil. Since the aluminum surface is an all-sealed electric motor in which a stator coil, which has been subjected to ammonia-resistant electrical insulation treatment by alumite treatment or insulation coating treatment, is wound around the stator core, While maintaining high electrical insulation, the sub-coil is composed of a copper wire, which is the third core, and an aluminum whose conductivity does not change significantly. Don't block Fourth, while achieving dual ammonia resistance, it does not hinder the complete sealing structure as in the past, and the outer shell structure of the motor, such as the motor frame, is pressure resistant and airtight. It does not leak the refrigerant inside it while holding it. Further, when the surface of the coated aluminum of the stator coil is anodized, unlike the insulating coating, the aluminum and the alumite layer are integrated so that the coating does not peel off. And forming resistance of the stator coil against ammonia.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them, unless otherwise specified. It's just an example. FIG. 1 shows an embodiment of the present invention. (A) is a broken side view of a hermetic motor, (B) is a sectional view of an essential part of a stator wheel, and (C) is a perspective view of an essential part of the stator wheel. In the figure, 1 is a load which is a fluid device such as a compressor for ammonia or a pump for ammonia, and 2 is a hermetically sealed motor. The electric motor 2 has one end connected to the load 1 via a bearing (not shown), and the other end connected to a bearing 6 fitted into the outer shell of the electric motor, and a drive shaft 5 rotatably fitted thereto. A rotor core 7 is fixedly provided, and a stator core 8 is arranged inside the outer shell so as to face the rotor 7 and an air gap is provided between the stator core 8 and the stator coil 4 wound around the rotor core. To do.

The stator wire 4 is formed by forming a copper wire 11 on the core wire and an aluminum coating material 12 on the surface of the copper wire 11 which has been subjected to an ammonia-resistant electrical insulation treatment. It is composed by. 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 above-mentioned aluminum coating material 12 is carried out by a conventional technique such as vapor deposition of aluminum metal on the copper wire, pressure welding or pressure bonding of the tube material. On the other hand, the insulation coating process is performed by coating or baking on the target coated surface. The inside of the electric motor 2 is in communication with the load 1 via the connecting portion (not shown), and an ammonia atmosphere state is possible. The interior ammonia is prevented from leaking to the outside by the robust structure of the outer shell.

The connection between the stator coils 4 is a connection between the copper wires 11 of the core wire, which is subjected to an ammonia-resistant electrical insulation treatment, and further insulated from the stator coil 4 to the outside of the machine. As for the connection parts and terminals of 10 in the same manner as described above, the surface of 11 parts of the copper wire is coated with an aluminum metal material, and is formed into a structure that is subjected to an ammonia-resistant electrical insulation treatment.

2A and 2B show another embodiment of the stator coil of the present invention, where FIG. 2A is a sectional view of a main part of the second embodiment, and FIG. 2B is a sectional view of the main part of the third embodiment. C) is a perspective view of a main part of (A) or (B), showing the stator coil 4 wound around the stator core 8 inside the electric motor 2, the copper wire 11 as a core wire, and the copper wire. Aluminium coating material 12 whose surface is anodized, and whose surface is subjected to an insulating coating treatment 13. Further, the surface of the insulating coating treatment 13 is coated with an ammonia-resistant resin according to the prior art. By coating 16 a multilayer coating structure is formed.

Next, the behavior of the present invention during load operation will be described. When the drive shaft 5 of the electric motor 2 which is connected to the load 1 via the 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, and the drive shaft 5 is Each time the rotor rotates, the refrigerant also enters the inside of the stator core 8 and the entire inner structure of the electric motor 2 is exposed to the atmosphere of ammonia together with the stator coil 4. However, in the present invention, the stator coil 4 whose main material is the copper wire 11 that is violated by ammonia in the atmosphere is provided with an ammonia-resistant electrical insulation treatment on the outer side thereof and has a one-layer or two-layer structure. In addition, since the motor 2 is further coated with aluminum metal and processed, the electric motor 2 forms a structure resistant to the ammonia, and has good conductivity of the aluminum used. A hermetic structure with a simple structure that does not generate eddy current loss, has a small amount of heat generation, and enables durable and continuous operation without impairing motor efficiency. As a result, unlike the structure of a can-type electric motor, a complicated structure and technical problems resulting therefrom are not encountered.

[0014]

[Effect of the device]

 As described above, according to the present invention, the stator coil, which has been hitherto struck by ammonia corrosion, is subjected to an ammonia-resistant electrical insulation treatment that is composed of multiple layers to protect the copper wire used and to provide a fully sealed electric motor. The configuration solves the major technical problems such as the conventional corrosion phenomenon in a refrigerant atmosphere and durability, and it does not impair the motor efficiency, is simple, has few heat-generating elements, and increases the electric capacity. It has various remarkable effects such as presenting the technology for constructing a fully sealed electric motor with an internal structure that makes it possible to use ammonia for the first time with this invention, which meets the social demands including compliance with CFC regulations. It becomes possible to provide a general-purpose fully-sealed electric motor for driving consumer equipment, and its practical value is extremely large.

[Brief description of drawings]

1 shows an embodiment of the present invention, in which (A) is a side view of a hermetic motor, which is cut away, (B) is a sectional view of a main part of a stator wheel, and (C) is a perspective view of a main part of the stator wheel. It is a figure.

FIG. 2 shows another embodiment of the stator wheel of the present invention,
(A) is a cross-sectional view of an essential part of Example 2, (B) is a cross-sectional view of an essential part of Example 3, and (C) is a perspective view of an essential part of (A) or (B).

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

FIG. 4 is a cross-sectional view of a main part of a stator wheel of an electric motor, which illustrates a conventional technique.

[Explanation of symbols]

 1 load, (fluidic device, etc.) 2 hermetic motor 4 stator wire ring 8 stator core 10 insulated wire 11 copper wire 12 aluminum metal coating 13 insulation coating

Claims (2)

[Scope of utility model registration request] 1. A hermetically sealed electric motor for driving equipment using ammonia, wherein a surface of a copper wire is covered with aluminum metal, and a stator coil having a surface subjected to an ammonia-resistant electrical insulation treatment is fixed to the electric motor. A fully sealed electric motor that is wound around an iron core. 2. The fully sealed electric motor according to claim 1, wherein the insulating treatment is an alumite treatment or an ammonia resistant insulating coating treatment.