JP3472360B2 - Rotating electric machine and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine and a manufacturing method thereof, and more particularly to a rotating electric machine in which a stator core is held in a stator frame through a key groove and a key bar, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A stator core of a rotary electric machine of this type which has been generally adopted in the past has a structure in which thin steel plates each having a slot for winding insertion on the inner peripheral side and a key groove on the outer peripheral side are stacked in a cylindrical shape. It is usually configured. The cylindrical stator iron core is firmly fixed and held in the stator frame, and this fixed holding in this case usually extends in the axial direction on the inner circumference of the stator frame. A key bar is provided, and a key is fixed to (or integrally formed with) the key bar, and a key groove provided on the outer circumference of the stator core is fitted into the key bar, whereby Usually, it is fixedly held.

In the rotating electric machine thus formed, the key groove fixed to the key bar in the stator frame and the key groove of the iron core are formed larger in the key groove because of the assembly relation. It is normal that there is a gap between the two. For this reason, there is a risk of vibration when the rotating electric machine is in operation, so a padding is provided between the key and the key groove to eliminate a gap so that noise is not generated.

As a related article, Japanese Utility Model Laid-Open No. 57-21235 can be cited.

[0005]

In the rotary electric machine formed as described above, the iron core is firmly held in the stator frame, and in a normal rotary electric machine, there is no particular problem. If a large-capacity rotating electric machine is repeatedly shut down, thermal expansion and contraction will occur in the core in the radial and stacking directions, causing friction between the outer surface of the core and the inner surface of the key bar for many years. During operation, abrasion powder was generated, and there was a dislike of the abrasion powder adversely affecting electrical insulation such as winding insulation.

The present invention has been made in view of the above, and an object thereof is to generate wear powder due to friction between the outer peripheral surface of the iron core and the key bar even in a large-capacity rotating electric machine. There is no fear of adversely affecting electrical insulation, that is, to provide a highly reliable rotating electric machine of this type.

[0007]

That is, the object of the present invention is to insert a padding, which is softer than the stator core, into the gap between the inner peripheral surface of the key bar and the outer peripheral surface of the stator core in the stator frame. Is achieved.

[0008]

In other words, in the rotating electric machine formed as described above, even if the iron core expands and contracts thermally and friction with the key bar occurs, friction occurs through the padding that is softer than the iron core.
Since the iron core is not worn away and wear powder is not generated, reliability can be improved without fear of adversely affecting electrical insulation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments. 5 and 6 show a cross section of a main part of the stator core of the rotating electric machine. The stator iron core 1 formed by stacking thin steel plates is supported by the stator frame 4 by fitting the key groove provided on the outer peripheral surface thereof to the key portion provided on the key bar 2. . End plates 3 are arranged at both ends of the key bar 2, and the stacked stator cores are pressed by the end plates 3 and the key bars 2.

FIG. 1 shows a fitting portion between the stator core and the key bar. A padding 6 is inserted in a gap between an inner peripheral surface of the key bar and an outer peripheral surface of the stator core. The condition is that the filling material is softer than the stator core.

The padding is preferably in the form of a sheet, and more preferably an insulating sheet such as polyamide paper having high abrasion resistance. For example, in Nomex-410 manufactured by DuPont, which is one of the polyamide papers, the tensile strength is 12 kgf (0.13 mm thickness and 15 mm).
Width), tear strength of 200 g (0.13 mm thickness), end tear resistance of 18 kgf (0.13 mm thickness, 20 mm width) and sufficient strength, and is suitable for use in the present invention.

In the above description, the sheet-shaped insulator is used as the padding, but the padding does not always have to be a sheet-like piece. For example, as shown in FIG. 2, the keybar and the stator core are bonded together. The agent 7 may be injected, or it may be applied to one of the surfaces. Of course, even in this case, the adhesive 7 must be made of a material softer than the iron core.

The one in which the adhesive 7 is injected will be particularly effective in terms of workability when it is carried out in an existing machine. Also, by adjusting the viscosity of the adhesive, it will be possible to inject even into very small crevices where it is difficult to insert the sheet, which will be very easy to do. It should be noted that as the adhesive to be injected, for example, polyester resin, epoxy resin, epoxy compound, or the like seems to be good.

FIG. 3 shows still another embodiment. In this case, the padding 6 coated with the adhesive on both sides is inserted between the key bar 2 and the stator core 1. By forming the padding in this way, the padding 6 can be firmly fixed between the key bar 2 and the stator core 1, and the wear resistance of the padding can be improved.

FIG. 4 shows one method for filling the padding. A jig 8 for expanding the key bar 2 in the radial direction is provided in advance on the stator frame 4 and fixed to the key portion of the key bar 2. After fitting the key groove of the child core 1, the jig 8 bends the key bar 2 outward in the radial direction to widen the gap G between the outer peripheral surface of the stator core and the key bar 2, and in this widened state. The padding 6 is inserted or filled in the gap.
This method is effective because a sufficient amount of filling material can be filled in the entire gap relatively easily.

[0016]

As described above, according to the present invention, a padding that is softer than the stator core is inserted into the gap between the inner peripheral surface of the key bar and the outer peripheral surface of the stator core in the stator frame. Therefore, even if thermal expansion occurs in the iron core and friction occurs with the keyer, it is friction through the filling material that is softer than the iron core, and the iron core does not wear and no abrasion powder is generated. It is possible to obtain a highly reliable rotating electric machine of this type that does not have a bad influence.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a key bar main part of a rotating electric machine of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the key bar main part of the rotating electric machine of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the key bar main part of the rotating electric machine of the present invention.

FIG. 4 is a sectional view showing another embodiment of the key bar main part of the rotating electric machine of the present invention.

FIG. 5 is a vertical sectional side view showing an embodiment of the rotating electric machine of the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... Stator core, 2 ... Key bar, 3 ... End plate,
4 ... Stator frame, 5 ... Rotor, 6 ... Padding, 8 ... Jig.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-104110 (JP, A) JP-A-1-218335 (JP, A) Actual exploitation 57-21235 (JP, U) Actual exploitation Sho-47- 25103 (JP, U) Actually open 54-52004 (JP, U) Actually open 56-40446 (JP, U) Actually open 1-180156 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 1/18 H02K 15/02

Claims (5)

(57) [Claims] 1. A stator core, a stator core which is formed by stacking steel plates in a cylindrical shape and is placed inside the stator frame, and a stator core along the axial direction of the stator frame. A key groove formed to extend to the outer peripheral surface of the stator, a key bar located on the outer periphery of the stator core and extending along the axial direction of the stator frame, and the stator core A key portion that is formed at the center of the inner peripheral surface side of the key bar facing the outer periphery and that fits into the key groove, and an end plate that is arranged at both end sides of the key bar and that presses the stacked steel plates of the stator core. In a rotating electrical machine having, in the gap between the inner peripheral surface of the key bar and the outer peripheral surface of the stator core that are adjacent to both sides of the key portion, a material softer than the stator core, and an adhesive on both sides. It is special that the coated sheet filling is inserted. The rotating electric machine to be collected. 2. A stator core, which is formed in a cylindrical shape by stacking a stator frame and steel plates, and which is placed inside the stator frame, and a stator core along the axial direction of the stator frame. A key groove formed to extend to the outer peripheral surface of the stator, a key bar located on the outer periphery of the stator core and extending along the axial direction of the stator frame, and the stator core A key portion that is formed at the center of the inner peripheral surface side of the key bar facing the outer periphery and that fits into the key groove, and an end plate that is arranged at both end sides of the key bar and that presses the stacked steel plates of the stator core. In a rotating electric machine having: a padding formed in the gap between the inner peripheral surface of the key bar and the outer peripheral surface of the stator core, which are adjacent to both sides of the key portion, with an adhesive applied to the stator core. A rotating electrical machine characterized by being performed. 3. A stator core, which is formed by stacking steel plates and steel plates into a cylindrical shape, and which is placed inside the stator frame, and along the axial direction of the stator frame, and the stator core. A key groove formed to extend to the outer peripheral surface of the stator, a key bar located on the outer periphery of the stator core and extending along the axial direction of the stator frame, and the stator core A key portion that is formed at the center of the inner peripheral surface side of the key bar facing the outer periphery and that fits into the key groove, and an end plate that is arranged at both end sides of the key bar and that presses the stacked steel plates of the stator core. In the method of manufacturing a rotating electrical machine having, in assembling the stator core in the stator frame, in the gap between the inner peripheral surface of the key bar and the outer peripheral surface of the stator core that are adjacent to both sides of the key portion. Inject the adhesive, and cure A method for manufacturing a rotary electric machine, wherein a padding to be inserted is formed. 4. A stator core and a stator core which is formed by stacking steel plates to form a cylindrical shape and is placed inside the stator frame, and along the axial direction of the stator frame, and the stator core. A key groove formed to extend to the outer peripheral surface of the stator, a key bar located on the outer periphery of the stator core and extending along the axial direction of the stator frame, and the stator core A key portion that is formed at the center of the inner peripheral surface side of the key bar facing the outer periphery and that fits into the key groove, and an end plate that is arranged at both end sides of the key bar and that presses the stacked steel plates of the stator core. In the method for manufacturing a rotating electric machine having, after fitting the key of the stator frame and the key groove of the stator core, the inner peripheral surface of the key bar and the stator core that are on both sides of the key portion. Inject the adhesive into the gap with the outer peripheral surface,
A method of manufacturing a rotating electric machine, characterized in that a filling material that is cured and inserted is formed. 5. A stator core, which is formed by stacking steel plates and steel plates into a cylindrical shape, and is placed inside the stator frame, and along the axial direction of the stator frame, and the stator core. A key groove formed to extend to the outer peripheral surface of the stator, a key bar located on the outer periphery of the stator core and extending along the axial direction of the stator frame, and the stator core A key portion that is formed at the center of the inner peripheral surface side of the key bar facing the outer periphery and that fits into the key groove, and an end plate that is arranged at both end sides of the key bar and that presses the stacked steel plates of the stator core. In a method of manufacturing a rotating electrical machine having: a key of the stator frame and a key groove of the stator core are fitted together, and the key bar is bent outward in the radial direction to form a space between the stator core outer peripheral surface and the key bar. spread of the gap, while the the unfolded, the gap A method of manufacturing a rotating electric machine, characterized in that a padding that is softer than a stator core is inserted between the stator core and the stator core.