JPS6212351A - Manufacture of rotary electrical equipment - Google Patents

Abstract

PURPOSE:To prevent the exposed parts of winding from adhering to the chips by machining the inside circumferential surface of a bracket and that of a stator core after contacting the beltlike film to the inside thereof in contact with the bottom surface of a coil end and the edge surface of a stator core. CONSTITUTION:The beltlike long and narrow films 30-1 and 30-2 are formed in ring to position so that they may contact to the bottom surface of the coil end of a winding 3 and the lateral surface of a stator core and that they may contact to the inside circumferential surface of notched parts 23 and 24. Then the inside circumferential surface of brackets 21 and 22 and those of the stator core are machined at the same time. Thus the winding 3 is completely sealed with the beltlike films 30-1 and 30-2 from the adhesion by the chips in the simultaneous machining.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric motor, etc., in which, after assembling a stator part, the inner circumferential surface 2 of the stator core facing the gap and the inner circumferential surface serving as the bearing support part of the bracket are simultaneously machined. The present invention relates to a method of manufacturing a rotating electrical machine, and particularly relates to an improvement in the protection of windings.

[Conventional technology]

For example, in Fig. 4, there was an electric motor manufactured by this type of manufacturing method as shown in Fig. 4. In Fig. 0, (!)
is a frame, (2) is a stator core that is press-fitted and fixed to the inner peripheral surface of this frame Tl+ and has nine windings (3) wound thereon;
141 and 151 are brackets on the load side 3 and anti-load side, respectively, which are fitted and fixed to the frame (1:) with bolts (not shown). (8) is a shaft, and aυ is positioned on this shaft (8). Fixed and above stator core (
2) and the rotor core facing each other through the gap a3, +
91. (IG is the load side and anti-load side bearings that are positioned and fixed on the shaft (8), +61° (7) is the bearing (9) that holds the side surface of the outer ring of the bearing (9) 8 and α [, respectively, the above platen] +43E
and (5) are fixed with bolts (not shown) to position the shaft (8) at an appropriate position in the axial direction.Axle box covers on the load side 8 and anti-load side; +13 is the winding (3); This is a resin such as epoxy that protects the winding wire (3), which is reinforced around the outer circumference, from foreign substances from the outside.

Next, a method of manufacturing a conventional electric motor will be explained.

The winding (31) is wound around the stator core (2), and this winding (31) is wound around the stator core (2).
The outer peripheral surface of the coil end portion of No. 31 is covered with resin [13].

Next, this stator core (2) is press-fitted into the inner peripheral surface of the frame (1) and positioned. Next, fit the load side 2 and anti-load side brackets (4) 2 and (5) to the sides of the frame (1).

Fix it. With reference to the machining reference plane (not shown) provided on the outer circumferential surface or side surface of this bracket (4) or (5), the inner circumferential surface of the above-mentioned platen) The housing surface on which the outer ring is held] S and the inner circumferential surface of the stator cob and A (2) are simultaneously machined using a lathe, grinder, etc. Next, the chips generated during this process are cleaned with air, etc., and the rotor core
The shaft (8) with the bearing (9) and qQI fixed in position is inserted axially into the interior of the stator assembly. Finally, use the axle box covers (6) and (7) to press down the sides of the bearing (9) and the outer ring of αQ to position the rotor assembly in the axial direction and assemble it.

[Problem that the invention seeks to solve]

Conventional electric motors are manufactured and constructed using the manufacturing method described above, and when the gap length α is extremely small (for example, 1
00μ or less) or when the eccentricity of the air gap has a significant negative effect on the characteristics of the motor.

A method is adopted in which assembly errors and processing errors that occur between frame +1) and stator core (2), and between frame (1) and platen) 141E and (5) are corrected in the final simultaneous machining. . However, after winding the 9th winding (3), the inner peripheral surfaces of the stator core (2), bracket +412, and (54) are processed, so the winding (3) must be It is necessary to protect exposed parts (for example, coil end parts, etc.).In the conventional quantity, resin A3 such as epoxy is applied to the outer peripheral surface of the coil end.
The wire is strengthened and the winding is wrapped and hidden. This protection method had the drawbacks of extremely poor workability (and high cost).

The present invention was made to solve this problem, and an object of the present invention is to provide a method for manufacturing a rotating electrical machine that can safely protect the exposed portions of the nine windings from chips.

[Means for solving problems]

A method of manufacturing a rotating electric machine according to the present invention is as follows.

(1) A step of inserting a stator core with nine windings into the inner peripheral surface of a cylindrical frame.

(2) On the inner surface facing the stator core, a cut portion having a diameter larger than the inner circumferential surface of the bracket and the inner circumferential surface of the stator core, which will be processed in the fourth step described later, is formed by a pair of pre-processed brackets. , closing both openings of the frame.

(31. Winding a band-shaped film into a ring shape, which is in contact with the bottom surface of the coil end of the winding, the end surface of the stator core, and the inner surface of the notch of the bracket.

(41 Step of machining the inner circumferential surface of the bracket and the inner circumferential surface of the stator core concentrically and simultaneously.

They are manufactured in the following order:

[For production]

In this invention, after a strip-shaped film is inscribed in the cut portion reinforced by the bracket in contact with the bottom surface of the coil end and the end surface of the stator core, the inner circumferential surface of the bracket and the inner circumferential surface of the stator core are processed. Chips do not adhere to the exposed part of the winding.

[Real example]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. 2 in FIG. 1, the same reference numerals indicate the same or equivalent parts, and the brackets 8 and 8 on the load side and anti-load side are respectively shown in FIGS. 2 and 3. (30- 1) g and (3G
-2) is a belt-shaped film formed in a ring shape.

Next, a method for manufacturing an electric motor according to the present invention will be explained using FIG.

First, the stator core (2) with the first winding (3) wound thereon is press-fitted and fixed onto the inner circumferential surface of the frame (1), and then the bracket c+na, which has the notch c!41 machined in advance, is attached to the frame (1). Fit and fix the strip film (3).
0-1) 8 and (30-2) are in contact with the bottom (inner peripheral surface) of the coil end of the winding (3) and the side surface of the stator core (2), and the platen l-+2υ8 and @ 1
It is formed into a ring shape and arranged so as to be in contact with the inner peripheral surface of the provided notch and @.

The width of the 8 films (30-1) and (30-2) is
The end face of the stator core 12) and the cut portions Rio and c! The sealing effect can be increased by applying fest etc. to the area where the end face meets the side surface of the film to fill the gap and dry it. Furthermore, the above strip film (
After forming 3G-1) (3G-2) into a ring shape, a metal ring (not shown) to maintain the shape during drying is provided auxiliary on the inner circumferential surface of the band-shaped film and removed after drying. It is also possible. After applying the ring-shaped strip films (30-1)E and (30-2), the inner circumferential surfaces of the brackets cog and @ and the inner circumferential surface of the stator core (2) are simultaneously processed. do. In this way, the above strip-shaped films (30-1) and (30-2)
As a result, the winding (31) is completely sealed from chips during simultaneous machining.

As before, rotor core aD, bearing (9
The shafts (8) with fixed positions of O and α1 are inserted axially into the interior of the stator assembly.

Finally, use the axle box covers (6) S and (7) to press down the sides of the outer rings of the bearings (9) and (1) to assemble the rotor.

Assemble by positioning the vertical part in the axial direction.

〔Effect of the invention〕

As explained above, the present invention covers both openings of the frame with a bracket having a notch in advance, and then winds a band-shaped film in a ring shape so as to contact the notch and the side surface of the bottom tossator core of the coil end. After that, the inner circumferential surface of the bracket and the inner circumferential surface of the stator core were machined concentrically and at the same time, making it possible to completely seal the two windings from chips, increasing reliability in terms of insulation, and making the work even easier. A rotating electrical machine that is improved in terms of performance and cost can also be obtained.

[Brief explanation of drawings]

FIG. 1 is a structural sectional front view of a stator assembly part of an electric motor manufactured by a manufacturing method according to an embodiment of the present invention, and FIG. 2 is a side view of a bracket having a notch according to an embodiment of the present invention. , FIG. 3 is a sectional view taken along line A-A in FIG. 2,
FIG. 4 is a structural sectional front view showing an electric motor manufactured by a conventional manufacturing method. In the figure, (1) is the frame, and (2) is the stator core. (3) is the winding, (4) is the load side platen), (5+ is the anti-load side bracket, cs, @ is the notch provided in the bracket, (3Q-1), (30-2)
) is a band-shaped film formed into a ring shape. Note that the same reference numerals in Figure 9 indicate the same or equivalent parts.

Claims (1)

[Scope of Claim] A method for manufacturing a rotating electric machine, characterized in that the manufacturing process is performed in the following order: (1) A step of inserting a stator core with windings into the inner peripheral surface of a cylindrical frame. (2) A notch portion having a diameter larger than the inner peripheral surface of the bracket processed in the fourth step described later and the inner peripheral surface of the stator core on the side facing the stator core, and a pair of pre-processed brackets. , closing both openings of the frame. (3) A step of applying a ring-shaped band-shaped film in contact with the bottom surface of the coil end of the winding, the end surface of the stator core, and further in contact with the inner peripheral surface of the notch of the bracket. (4) Processing the inner circumferential surface of the bracket and the inner circumferential surface of the stator core concentrically and simultaneously.