JPS5849061A - Coil connecting system for high temperature canned motor - Google Patents

Abstract

PURPOSE:To improve the reliability of a high temperature canned motor by connecting all connecting parts of a motor coil using Ni-plated copper wires at the place where it is held at the atmospheric temperature out of the motor, thereby preventing an accident due to the oxidation of the copper wires. CONSTITUTION:A relatively long guide tube 38 is provided at part of a motor casing 34 of a canned motor 12 which is surrounded at the inner periphery of a stator assembly 16 sealed liquidtightly with a stator can 30 and which is sealed by a rotor can at the outer periphery of a rotor assembly 18. The terminals X, Y, Z and U, V, W of field coils of the respective phases of the stable assembly 16 are led together with part of the coil into the tube 38, the terminals X, Y, Z of the coils are connected to the neutral point, and the terminals U, V, W are connected to the connecting terminal of a power source in a terminal box 40 arranged at the end of the tube 38. In this manner, the oxidation of the copper wire, from which Ni-plating is exfoliated, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a field winding connection system for a canned motor operated in a high temperature atmosphere.

Generally, Ni-plated copper wire is used as the field winding of a motor used in a high temperature region around 300°C. When this type of Ni-plated copper wire is configured as the field winding of a motor, it must be connected to the correlation, neutral point, or lead wire. - In the case of connection, the Ni metal must be peeled off. For this reason, in order to prevent the first winding from oxidizing, it is necessary to completely seal the connection part to cut off the outside air, or to re-plat the connection part with Nl after connection.

Therefore, high-temperature canned motors having a conventional wire-wound structure are not only expensive to manufacture, but also have problems in terms of reliability.

%K, the oxidation of copper wire is severe at high temperatures, and as shown in Figure 91, the search for oxidation progresses rapidly over time, and the conductive part shows an increase in resistance.

There is a drawback of changing the motor characteristics.

Therefore, in order to overcome the problems of the conventional 411I structure mentioned above, the inventors, Hiroshi et al., conducted various prototype research on means to completely seal the connection part of the winding where the Ni plating is removed. 1) There was no suitable sealing material for high-temperature conditions, and the seal was not perfect in the splitter, which was difficult to work with, and it was difficult to reliably prevent oxidation.

However, as a result of careful consideration, we focused on the fact that oxidation of steel makes it difficult to open and move under low temperature conditions, and as a result, we decided not to make the connection marked ** inside the motor, which is exposed to high temperatures. First, it was discovered that the above-mentioned problems caused by oxidation of the copper wire could be resolved even if the Ni plating was removed by pulling part of the winding outside the motor and performing the test in a low-temperature location. .

Therefore, it is an object of the present invention to prevent oxidation of the copper wire by connecting all the joints of the two windings in a place kept in a low temperature atmosphere outside the motor when Ni-plated copper wire is used as the motor winding. An object of the present invention is to provide a winding connection method for a high-temperature canned motor that can prevent accidents and improve reliability.

To achieve the above object, in the present invention, in a high-temperature canned motor in which the motor *m is constructed using Ni-plated copper wire, all the connection parts of the windings are connected to the outside of the canned motor along with a part of the windings. The windings are connected at nine locations while the windings are connected at nine locations.

In the above-mentioned winding connection method, a terminal box is provided in a part of the canned motor through a relatively long guide tube, and the windings are connected to each other inside this guide tube, and the terminals of the windings are connected to each other inside the guide tube. It is preferable to connect directly to the power supply connection terminal of the terminal box.

Further, it is preferable to apply an insulating bonding material to a part of the winding drawn out from the canned motor for mechanical protection.

Next, an embodiment of the 4111 connection method of a high temperature canned motor according to the present invention will be described in detail by station with reference to the attached drawings.

FIG. 1 is a model diagram of fFlII used in the present invention.

The connection arrangement of the windings when incorporated into the JEFi canned motor is shown. That is, in the present invention, as shown in the iris diagram, the windings A and B of each phase.

Each of the windings A and B consists of continuous windings.

The Co11M terminals x, y, z, ty, v, and w are not connected inside the motor, but are configured to have a sufficient length so that they can be pulled out to the outside as they are.

Next, the specific connection of the windings when a canned motor is constructed using the windings constructed as shown in FIG. 3 will be described with reference to FIG.

The gJ diagram shows a typical configuration example of a canned motor pump using a canned motor, so reference numeral 10 indicates the pump section, /J indicates the canned motor section, and the pump section IO
and the canned motor section/cotosha adapter l≠ are connected to each other so as to be compatible with each other. The canned motor @/λ has a stator assembly /4 and a rotor assembly /l, the internal part of the stator assembly 16 is fluid-tightly surrounded by the stator can-O, and the outer periphery of the canned motor assembly /l is surrounded by the rotor assembly /l. It will be sealed with cancoco. Near both ends of the cylinder/taper assembly/1 are the stator can JO and bearing housings 51 and 51.
The rotor N26e-24 is used as a sealed liquid space.
is formed, and the bearing housing λ≠.

The rotor shaft JO is supported by bearings 1 and 1 arranged respectively on the shaft. On the other hand, the stator chamber of the stator assembly/l is sealed with dust by both lllAt end plates J and JJ, and the outer periphery is 81m% with the motor casing J.
Seal tightly. Then, a circulation pipe 34 for circulating a part of the liquid handled by the pump is led out from the discharge port side of the pump s10, and is connected to the canned motor section A,! It communicates with the rear rotor chamber 24 of No. 5. In this way, a part of the liquid handled by the pump is introduced into the rear p-metal 1iJ4 of the canned motor section, passed through the gap between the stator can 20 and the rotor can, and then transferred to the front rotor. The pump section 10 is guided into the rotor chamber 26 through appropriate through holes.
can be refluxed to the low pressure side of the Note that one end of a relatively long guide tube It is connected to the motor casing J-g of the stator assembly 11, and the other end of the guide tube Jt is sufficiently spaced from the canned motor part I. Terminal box #Ot-Connection arrangement.

Although the above configuration is the basic configuration of a canned motor pump, one feature of the present invention is the connection of the field windings constituting the stator assembly/4. That is, as mentioned above, the terminals x, y,
z, U, V, and W are the guide pipes J from the stator room, respectively.
Pull it out together with a part of the winding into the inside of l. In this case, it is preferable to apply an insulating coating material such as mica tape or mica tube to a part of the drawn-out winding wire for mechanical protection.

In this way, the terminals x, y, and z of the winding are short-circuited (neutral point connection), and the terminals U, V, and W are connected to the power supply connection terminal of terminal shaft 〇 (Hide line connection).

According to this example, the stator house wires are at high temperature, but the guide tube that communicates the stator chamber and the terminal shaft is maintained at atmospheric temperature. – Each terminal marked ** inside the guide tube!
1. Even if the Ni plating is peeled off when performing continuation. Accidents caused by unification of copper wires can be prevented.

As is clear from the above-mentioned embodiments, in the present invention, each of the 81 connections of the windings of the canned motor are not made inside the canned motor, which is in a high temperature atmosphere, but are all connected to the atmospheric temperature separated from the canned motor part. By carrying out the process at the appropriate location where the Ni plating has been peeled off, it is possible to effectively prevent the steel wire from becoming oxidized. In addition.

In the embodiments described above, the human connection of the three-phase winding was explained, but it is also possible to use a Δ connection. In addition, if all connections are made outside the canned motor section as described above, it is possible to make split connections using multiple windings without using continuous windings for each phase. be.

Therefore, according to the **** kettle system according to the present invention, the following various superior kettles can be obtained compared to the conventional kettles.

+1) 4! There is no need to seal the wire connections, and manufacturing costs can be significantly reduced.

(2) Oxidation prevention of connection parts can be effectively achieved.

Motor characteristics are stabilized and reliability is improved.

(5) 4)! Since the terminal is pulled out together with part of i to the outside of the canned motor section, the lead il (outlet l1I) is not required.

(4) The number of windings drawn out to the outside increases.

If continuous winding is used, it can be manufactured relatively easily by connecting four terminals.

Although the preferred embodiments of the present invention have been described above, it is of course possible to make various design changes without departing from the spirit of the present invention.

[Brief explanation of drawings]

Figure 7 is a diagram of the oxidation characteristic curve of bare copper wire over time in a high-temperature atmosphere; Figure 1 is a model diagram of the winding wire used in the method of the present invention;
3rd rgJ is a sectional view of a main part of a canned motor pump showing an embodiment of the seaming connection method according to the present invention. IQ...Pump part l...Canned motor part/3...Adapter 14...Stator assembly it...Rotor assembly Ko...Stator center cylinder 6...P-ta w1 λj・・・Bearing SO---a-Evening axis JJ・・・End freight J
Dream...Motor casing 34...Circulation pipe Jt...
・Guide tube 4I0...Terminal shaft A, B, C...
・Winding wires X, Y, Z, U, V, W-, connection terminal patent applicant Nikkiso Co., Ltd.

Claims (3)

[Claims] (1) In a high-temperature canned motor in which the motor winding is constructed using Ni-plated copper wire, all the connections of the winding are pulled out of the canned motor along with a portion of the winding,
A winding connection method for high-temperature canned motors, which is characterized in that the windings are connected in a place maintained at atmospheric temperature. (2) A terminal box is installed in a part of the canned motor via a relatively long guide tube, and the windings are connected to each other inside this guide tube, and the terminals of the windings are directly connected to the terminal box's power source. A winding connection system for a high-temperature canned motor according to claim 1, which is connected to a connection terminal. (3) A high-temperature canned motor according to claim 1, in which a part of the windings drawn out from the canned motor is provided with an insulating covering material for mechanical protection. Winding connection method.