JPS6353785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a method of filling a cooling filler into a coil end of a rotating electrical machine such as an underwater motor.

[Conventional technology]

Figure 1 is a sectional view showing the conventional method disclosed in Japanese Utility Model Application Publication No. 48-31502.
is a cylindrical frame made of steel plate, 2 is this frame 1
The laminated stator core is formed by welding together a plurality of notches 2a provided in the axial direction on the outer peripheral surface of each core. . 3 is a stator coil wound around a plurality of slots (not shown) of this stator core 2; 8a and 8b are coil ends of this stator coil 3 protruding from both end surfaces of the stator core 2;
4 and 5 are a pair of ribs welded to both ends of the frame 1, 6 is a bracket that is connected to one of the pair of ribs 4 via a sealing O-ring 7 with a bolt 8, and 9 is the other one of the ribs. 12 is a rotor core that pairs with the stator core 2, and 13 is a rotor shaft fitted to the rotor core 12. They are rotatably supported by the brackets 6 and 9 via ball bearings 14 and 15, respectively. 16
17 is a shaft sealing member disposed between the bracket 9 and the rotor shaft 13; 17 is a closing member made of putty that closes one end opening of each of the plurality of notches 2a; 18, 18; are silica and resin injected between the inner circumferential surface of the frame 1 and the coil ends 3a, 3b to increase the cooling effect.

The operation of the device constructed in this manner is well known and will not be described here, but the method of filling the coil end with resin will be described below. After fitting the stator core 2 to the inner circumferential surface of the frame 1 with the stator winding 3 wound around the stator core 2, attach it so that the left end of the frame 1 faces downward as shown in the figure, and put it on with putty. The openings on the bracket 9 side of the plurality of notches 2a of the stator core 2 are closed with a closing member 17 made of resin,
After preventing the silica 18 from flowing downward through the plurality of notches 2a, the resin and silica 18 are injected and filled between the coil end 3b and the inner peripheral surface of the frame 1. The resin and silica 18 are attached to the coil end 3 with the right end facing downward in the figure of the rear frame 1 with the injected and filled resin and silica 18 fixed.
After this resin, silica 18, is injected and fixed between a and the inner circumferential surface of the frame 1, it is assembled as shown in the figure.

That is, with the notch 2a closed by the closing member 17, the filler is injected with the left end of the frame 1 facing down, and then this filler is applied to the coil end 3b and the inner periphery of the frame 1. After being fixed between the surface,
This time, filler is injected with the right end of the frame 1 facing down. At this time, since the filling material on the side of the closing member 17 has already been fixed, the filling material that has flowed into the notch portion 2a is prevented from flowing further downward from the notch portion 2a.

[Problem that the invention seeks to solve]

As described above, in the conventional filling method, when the stator core 2 is fitted into the frame 1, a plurality of notches 2 of the stator core 2 located deep inside the frame 1 are filled.
Since the opening of a is closed with a closing member 17 made of putty, the workability for closing is not only poor due to the small gap between the coil end 2b and the inner circumferential surface of the frame 1. , the closing work by the closing member 17 made of putty results in incomplete closing, and the inner circumferential surface of the frame 1 on the closing member 17 side and the coil end 3b
When a filler is injected between the outer periphery and the outer periphery, the filler flows into the notch 2a between the incomplete closing members 17, flows out of the frame 1 from the opposite side, that is, from the bottom, and forms a part of the frame. There was a problem that the filler adhered to the spigot part of one end face, requiring removal work, and caused damage such as the filler adhered to the jigs and tools used during the filling operation.

This invention was made in order to solve such conventional problems.
It is an object of the present invention to provide a method for filling a cooling filler for a rotating electric machine, which can easily and reliably close an opening of a.

[Means for solving problems]

A method of filling a cooling filler for a rotating electric machine according to the present invention includes forming a laminated stator core by welding a plurality of notches provided in the axial direction on the outer peripheral surface of each core, and A disc-shaped closing member is formed which has a slot facing the stator core, an outer circumferential portion is formed to have the same diameter as the stator core, and a portion facing the notch is closed, and the closing member is The stator core is brought into contact with one end surface of the stator core to close the cutout portion of the core, and a stator coil is wound around the slot of the stator core and the closure member to connect the stator core and the closure member. After press-fitting into the frame, the frame is arranged so that the coil end on the closing member side is located at the top, and a space between the coil end located at the top and the inner peripheral surface of the frame is used for cooling. The filler is filled and fixed, and then the frame is arranged so that the coil end on the side that does not have the closing member is located at the top, and the filler is filled in the space between the coil end and the inner peripheral surface of the frame. The cooling filler is injected and filled.

[Effect]

In this invention, the notch portion of the stator core is closed by a disc-shaped closing member whose outer peripheral portion is formed to have the same diameter as the stator core and whose portion facing the notch portion is closed. Moreover, before the stator core is press-fitted into the frame, the closing member is already in contact with one end surface of the stator core and the stator coil is wound thereon, and the work of closing the notch with the closing member is difficult. Since this is carried out outside the frame, the workability for closing is easy and reliable.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In the figure, reference numeral 19 denotes a closing member made of polyester film or the like, which is formed to have the same shape and dimensions as the stator core 2, except that the outer circumferential surface is formed into a circular shape, and which has an opening at one end of a plurality of notches 2a. It abuts on one end of the stator core 2 so as to close it. Reference numeral 19a designates a plurality of slots carved into the inner circumferential surface of the closing member 19. The stator coil 3 is wound around the plurality of slots of the stator core 2 and the plurality of slots 19a. The rest of the configuration and operation are the same as those of the conventional submersible electric motor, so the explanation will be omitted, but the method of filling the coil end with the cooling filler will be explained.

The plurality of slots 19a of the closing member 19 are aligned with the plurality of slots of the stator core 2 to which the plurality of notches 2a provided in the axial direction of the outer peripheral surface of each core are welded together, and the stator The coil 3 is wound around the plurality of slots of the stator core 2 and the plurality of slots 19a of the closing member 19, and the stator core 2 and the closing member 19 are press-fitted into the inner peripheral surface of the frame 1. In this case, the stator core 2 is closed by the closing member 19.
One end opening of the plurality of notches 2a is completely closed. In this state, attach resin or silica 18 to the coil end 3b so that the left end of the frame 1 is facing downward.
and the inner circumferential surface of the frame 1. This injected resin and silica 18 are fixed to the rear frame 1.
In the figure, attach the coil so that the right end faces downward, inject and fill the space between the coil end 3a and the inner peripheral surface of the frame 1 with resin and silica 18, and after the resin and silica 18 are fixed, assemble as shown in the figure. become.

In this case, the right end of the notch 2a in the figure is completely sealed by the closing member 19 and the filler, so when the filler is injected from the left side of the frame 1, the filler that has flowed into the notch 2a The material is reliably prevented from flowing out from below the notch 2a.

Although this embodiment describes a method of injecting and filling the resin and silica 18 between the coil ends 3a and 3b of the submersible motor and the inner peripheral surface of the frame 1, the method is not limited to this embodiment. For example, it goes without saying that the same effect can be obtained even if the resin or silica 18 is injected and filled between the coil end and the inner circumferential surface of the frame in a land motor. Further, in this embodiment, the resin and silica 18 are injected and filled, but the present invention is not limited to this embodiment, and any method may be used as long as it is easy to work with and increases the cooling effect of the stator coil 3.

〔Effect of the invention〕

As described above, the present invention forms a laminated stator core by welding together a plurality of notches provided in the axial direction on the outer peripheral surface of each core, and a slot facing the stator core is formed. a disc-shaped closing member having an outer circumference formed to have the same diameter as the stator core and a portion facing the notch portion being closed, and the closing member is attached to one end surface of the stator core. The stator coils are wound around the slots of the stator core and the closing member, and the stator core and the closing member are press-fitted into the frame. arranging the frame so that the coil end on the closing member side is located at the top, and filling and fixing a cooling filler in the space between the coil end located at the top and the inner peripheral surface of the frame; Thereafter, the frame is arranged so that the coil end on the side that does not have the closing member is located at the top, and the cooling filler is injected and filled into the space between the coil end and the inner peripheral surface of the frame. This makes it possible to reliably and quickly close one end opening of the plurality of notches in the stator core with the closing member before press-fitting the rotor core into the frame, thereby reducing the amount of time required to inject cooling filler. This not only makes it possible to quickly and reliably assemble the rotating electrical machine, but also to reliably prevent the filling material from flowing out. In addition, since the coil holds the closing member in contact with the end face of the stator core, there is no need for any special fixing means between the two.
Furthermore, since the same cutting dies and machines can be used to manufacture the iron core for circular punching and slot punching, the manufacturing cost is reduced, and it is also possible to manufacture the closing member in the same process as the iron core, which significantly reduces the manufacturing process. This has the effect of making it possible to achieve significant shortening.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional front view of a submersible electric motor in which the space between the coil end and the inner circumferential surface of the frame body is filled with resin using the conventional cooling filler filling method;
FIG. 3 shows one embodiment of this invention.
The figure is a partially sectional front view, and FIG. 3 is an enlarged side view of the closing member. In the figure, 1 is a frame body, 2 is a stator core, 2a is a plurality of notches, 3 is a stator coil, 3a and 3b are coil ends, 4 and 5 are collars, 6 and 9 are brackets, 7, 10 is an O-ring, 12 is a rotor core, 1
3 is a rotor shaft, 16 is a shaft sealing member, 18 is a cooling filler, 19 is a closing member, and 19a is a slot. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A stator core is formed by welding together a plurality of notches provided in the axial direction on the outer peripheral surface of each core to form a laminated stator core, and has a slot facing the stator core, and an outer peripheral portion of the stator core A disk-shaped closing member is formed to have the same diameter as the child core and has a closed portion facing the notch, and this closing member is brought into contact with one end surface of the stator core to close the core. After the notch is closed, a stator coil is wound around the slot of the stator core and the closing member, and the stator core and the closing member are press-fitted into the frame, the coil end on the closing member side is closed. The frame body is arranged so as to be located at the top, and the space between the coil end located at the top and the inner circumferential surface of the frame body is filled with a cooling filler and fixed, and then the closing member is not included. The frame body is arranged so that the side coil end is located at the top, and the cooling filler is injected and filled into the space between the coil end and the inner peripheral surface of the frame body. A method of filling cooling filler for rotating electric machines.