JP6922792B2 - Rotating machine and its bearing replacement method - Google Patents

Description

The present invention relates to a rotary electric machine such as a generator or a motor using a permanent magnet, and a method for replacing the bearing thereof.

Rotating electric machines such as large generators and motors have a long product life, and the bearings that support the rotating shaft wear and deteriorate as they are used. Therefore, they are replaced with new ones as consumables during maintenance and inspection. ing.

Japanese Unexamined Patent Publication No. 2013-150381 Japanese Unexamined Patent Publication No. 2013-223390 Japanese Unexamined Patent Publication No. 2013-247827

When a permanent magnet is used in a large rotating electric machine as described above, the stator and rotor are constantly attracted by magnetic force. Therefore, when the bearing is replaced, the stator and rotor are separated from each other. It took a lot of work to hold the gap. In particular, when an ultra-strong permanent magnet containing rare metal or the like is used, when the stator and rotor are attracted by magnetic force, it is not possible to separate the stator and rotor at the installation site. I had to transport it to the factory and pull it apart.

For this reason, it is an object of the present invention to provide a rotary electric machine capable of easily maintaining a gap between a stator and a rotor at the time of bearing replacement, and a bearing replacement method thereof.

The rotary electric machine according to the first invention for solving the above-mentioned problems is arranged inside the hollow frame, a cylindrical stator attached to the inside of the frame, and the stator. A cylindrical rotor, a rotating shaft attached to the rotor so as to penetrate the inside of the rotor, bearings provided in pairs on both ends of the rotating shaft, and the frame. In a rotary electric machine equipped with a pair of brackets attached to and supporting the bearings, a plurality of rotors are formed on both ends of the inner peripheral surface of the stator in the axial direction along the circumferential direction of the stator. On both ends of the outer peripheral surface of the rotor in the axial direction so as to face the stator side insertion groove and the stator side insertion groove oriented in the longitudinal direction along the axial direction of the stator. It is characterized by having a plurality of rotor-side insertion grooves formed along the circumferential direction and oriented in the longitudinal direction along the axial direction of the rotor.

In the first invention, the rotary electric machine according to the second invention is described so that the stator side insertion groove and the rotor side insertion groove face the insertion hole formed so as to face each other. The bracket is characterized by having a plurality of through holes formed in each.

The third type of rotary electric machine is characterized in that, in the first and second inventions, three or more of the insertion grooves are formed along the circumferential direction.

On the other hand, the method for replacing the bearing of the rotary electric machine according to the fourth invention for solving the above-mentioned problem is a method for replacing the bearing of the rotary electric machine according to the first invention, and the stator side difference. By positioning the rotation phase of the rotor so that the rotor side insertion groove faces the insertion groove, the difference formed between the stator side insertion groove and the rotor side insertion groove facing each other. An insertion hole forming step of forming an insertion hole on both end faces in the axial direction of the stator and the rotor, and a fitting rod made of a non-magnetic material that is detachably fitted into the insertion hole are inserted into the insertion hole. A fitting rod insertion step of inserting and fitting into the insertion hole, a bearing removing step of removing the bearing of the rotary electric machine in which the fitting rod is fitted into the insertion hole from the rotating shaft and the bracket, and the bearing. A bearing mounting step of attaching a new bearing to the rotating shaft and the bracket of the rotating electric machine from which the bearing has been removed, and a fitting rod pulling-out step of pulling out the fitting rod from the insertion hole of the newly mounted rotary electric machine. It is characterized by performing and.

The method for replacing the bearing of the rotary electric machine according to the fifth invention is a method for replacing the bearing of the rotary electric machine according to the second invention, in which the rotor side insertion groove is inserted into the stator side insertion groove. By positioning the rotation phases of the rotors so as to face each other, the insertion hole forming step of forming the insertion hole on both end faces in the axial direction of the stator and the rotor, and attachment / detachment to the insertion hole are possible. A fitting rod insertion step of inserting a fitting rod made of a non-magnetic material to be fitted into the insertion hole into the insertion hole through the through hole and fitting the fitting rod into the insertion hole, and a rotation in which the fitting rod is fitted into the insertion hole. A bearing removal step of removing the bearing of the electric machine from the rotating shaft and the bracket, a bearing mounting process of attaching a new bearing to the rotating shaft and the bracket of the rotating electric machine from which the bearing has been removed, and a new bearing mounting. It is characterized in that the fitting rod pulling-out step of pulling out the fitting rod from the insertion hole and the through hole of the rotary electric machine is performed.

According to the rotary electric machine and the bearing replacement method according to the present invention, when the bearing is replaced, the attraction due to the magnetic force between the stator and the rotor is prevented, and the gap between the stator and the rotor is created. Since it can be easily held at specified intervals, the replacement work can be completed only at the installation site without transporting to the factory.

It is a schematic structure diagram of the main embodiment of the rotary electric machine which concerns on this invention, and is the cross-sectional arrow line view of FIG. It is a cross-sectional arrow line view of the line II-II of FIG. It is explanatory drawing of the bearing exchange method of the rotary electric machine of FIG. 1, and is the cross-sectional arrow line view of line III-III of FIG. It is a cross-sectional arrow line view of the IV-IV line of FIG. It is a schematic structural drawing of another embodiment of the rotary electric machine which concerns on this invention.

An embodiment of a rotary electric machine and a bearing replacement method thereof according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments described based on the drawings.

<Main embodiment>
A main embodiment of the rotary electric machine and the bearing replacement method thereof according to the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, on the inner peripheral surface of the frame 11 having a hollow inner shape, the outer peripheral surface of the cylindrical stator (iron core) 12 made of a magnetic material such as iron is coaxial with the frame 11. It is fixed in this way. Inside the stator 12, a cylindrical rotor (iron core) 13 made of a magnetic material such as iron with a super-strong permanent magnet containing a rare metal or the like incorporated between the inner peripheral surface and the outer peripheral surface is fixed. It is arranged so as to face the stator 12 on the same axis with a gap G at a specified interval.

A rotating shaft 14 is attached to the inside of the rotor 13 so as to be coaxial with the rotor 13. A pair of bearings 15 are detachably attached to both ends of the rotating shaft 14. The bearing 15 is supported by a pair of annular brackets 16 detachably attached to both ends of the frame 11.

As shown in FIGS. 1 and 2, both ends of the inner peripheral surface of the stator 12 in the axial direction are inserted into the stator side in a semi-cylindrical shape oriented in the longitudinal direction along the axial direction of the stator 12. A plurality of grooves 21a (four in each in the present embodiment) are formed at equal intervals along the circumferential direction of the stator 12. On both ends of the outer peripheral surface of the rotor 13 in the axial direction, rotor-side insertion grooves 21b having a semi-cylindrical shape oriented in the longitudinal direction along the axial direction of the rotor 13 are provided in the circumferential direction of the rotor 13. A plurality of each (four each in the present embodiment) are formed at equal intervals along the above.

The stator side insertion groove 21a and the rotor side insertion groove 21b have the rotation phase of the rotor 13 such that the rotor side insertion groove 21b faces the stator side insertion groove 21a. When positioned, cylindrical insertion holes 21 are provided at gaps G on both end faces of the stator 12 and the rotor 13 at equal intervals along the circumferential direction of the stator 12 and the rotor 13. Each is provided so as to form a plurality (four in each of the present embodiments).

In the bracket 16, a through hole 22 having the same diameter as the insertion hole 21 has a rotation phase of the rotor 13 so that the rotor side insertion groove 21b faces the stator side insertion groove 21a. Is formed at a position coaxial with the insertion hole 21 (four each in the present embodiment).

In FIG. 1, 17 is a coil end, and 18 and 19 are bearing holders.

In the rotary electric machine 10 according to the present embodiment, when the bearing 15 is replaced, first, the rotor so that the rotor side insertion groove 21b faces the stator side insertion groove 21a. By positioning the rotation phase of 13, the insertion holes 21 are formed on both end faces in the axial direction of the stator 12 and the rotor 13 (the above is the insertion hole forming step).

Subsequently, a round bar-shaped fitting rod 23 made of a non-magnetic material such as stainless steel or fluororesin that is detachably fitted to the insertion hole 21 and the through hole 22 is inserted from the through hole 22 to the insertion hole 21. It is inserted toward and fitted into the insertion hole 21 (see FIGS. 3 and 4) (the above is the fitting rod insertion step).

Then, the bearing retainers 18 and 19 and the bearing 15 are removed from the rotating shaft 14 and the bracket 16 (the above is the bearing removing step). As a result, the rotor 13 is supported on the inner peripheral surface of the stator 12 in a state where the gap G is maintained at a predetermined interval via the fitting rod 23.

Next, the new bearing 15 and the bearing retainers 18 and 19 are attached to the rotating shaft 14 and the bracket 16 (above, the bearing attaching step), and the fitting rod 23 is inserted into the insertion hole 21 and the through hole 22. Pull out from (fitting rod pulling process).

As a result, even if the rotary electric machine 10 uses an ultra-strong permanent magnet containing a rare metal or the like, the attraction due to the magnetic force between the stator 12 and the rotor 13 is prevented, and the gap G at a predetermined interval is formed. It can be replaced with a new bearing 15 while holding it.

Therefore, according to the present embodiment, when the bearing 15 is replaced, the stator 12 and the rotor 13 are prevented from being attracted by the magnetic force, and the stator 12 and the rotor 13 are brought into contact with each other. Since the gaps G between them can be easily maintained at specified intervals, the replacement work can be completed only at the installation site without transporting to the factory.

Further, if the entire fitting rod 23 or the tip side thereof is made of a polymer material such as fluororesin or is coated with the polymer material, the fitting rod 23 is inserted into the insertion hole 21. At the time of fitting, it is possible to make it very difficult to scratch the stator 12, the rotor 13, and the like.

<Other Embodiments>
In the above-described embodiment, a case where a cylindrical insertion hole 21 and a through hole 22 are formed and a round bar-shaped fitting rod 23 that is detachably fitted into the holes 21 and 22 is used will be described. However, the present invention is not limited to this, and as another embodiment, for example, a prismatic insertion hole and a through hole such as a triangle, a quadrangle, or a polygon of more than that can be formed and attached to and detached from the hole. It is also possible to replace the bearings by using prismatic fitting rods such as triangles, quadrangles or more polygons that fit into.

Further, in the above-described embodiment, the case of the rotary electric machine 10 in which the four insertion holes 21 are formed on both end sides at equal intervals in the circumferential direction has been described, but the present invention is not limited to this, and the difference is three or more. If it is a rotary electric machine in which the insertion holes are formed on both end sides, the same operation and effect as in the case of the above-described embodiment can be obtained.

Further, in the above-described embodiment, the rotary electric machine 10 is capable of forming the insertion hole 21 by forming the insertion grooves 21a and 21b on both ends of the stator 12 and the rotor 13 in the axial direction, respectively. However, as another embodiment, for example, as shown in FIG. 5, on the inner peripheral surface of the stator 12 and the outer peripheral surface of the rotor 13, both ends of the stator 12 and the rotor 13 in the axial direction It is also possible to make the rotary electric machine 20 capable of forming the insertion hole 24 by forming the insertion grooves 24a and 24b over the entire length in the axial direction so as to communicate with each other.

The rotary electric machine and the bearing replacement method according to the present invention prevent the stator and the rotor from being attracted by the magnetic force when the bearing is replaced, and make a gap between the stator and the rotor at a specified interval. Since the replacement work can be completed only at the installation site without transporting to the factory, the life of the rotary electric machine can be extended and it can be used extremely effectively in industry.

10 Rotor 11 frame 12 Stator 13 Rotor 14 Rotor shaft 15 Bearing 16 Bracket 17 Coil end 18, 19 Bearing retainer 21, 24 Insert hole 21a, 24a Stator side insertion groove 21b, 24b Rotor side insertion groove 22 Through hole 23 Fitting rod G gap

Claims (5)

With a hollow frame inside
A cylindrical stator mounted inside the frame and
A cylindrical rotor arranged inside the stator and
A rotating shaft attached to the rotor so as to penetrate the inside of the rotor,
Bearings provided in pairs on both ends of the rotating shaft,
In a rotary electric machine equipped with a pair of brackets attached to the frame and supporting the bearings, respectively.
A plurality of stator side insertion grooves formed on both ends of the inner peripheral surface of the stator in the axial direction along the circumferential direction of the stator and oriented in the longitudinal direction along the axial direction of the stator.
A plurality of rotors are formed on both ends of the outer peripheral surface of the rotor in the axial direction so as to face the stator side insertion groove along the circumferential direction of the rotor, and the longitudinal direction is formed along the axial direction of the rotor. A rotating electric machine characterized by having an insertion groove on the rotor side facing the rotor. In the rotary electric machine according to claim 1,
It is characterized in that the bracket has a plurality of through holes formed so as to face the insertion holes formed so that the stator side insertion groove and the rotor side insertion groove face each other. Rotating electric machine to do. In the rotary electric machine according to claim 1 or 2.
A rotary electric machine characterized in that each of the insertion grooves is formed in three or more along the circumferential direction. The method for replacing the bearing of the rotary electric machine according to claim 1.
By positioning the rotation phase of the rotor so that the rotor side insertion groove faces the stator side insertion groove, the stator side insertion groove and the rotor side insertion groove face each other. In the insertion hole forming step of forming the insertion holes formed in the above direction on both end faces in the axial direction of the stator and the rotor.
A fitting rod insertion step in which a fitting rod made of a non-magnetic material that is detachably fitted into the insertion hole is inserted into the insertion hole and fitted.
A bearing removal step of removing the bearing of a rotary electric machine in which the fitting rod is fitted into the insertion hole from the rotating shaft and the bracket.
A bearing mounting process for mounting a new bearing on the rotating shaft and the bracket of the rotary electric machine from which the bearing has been removed, and
A method for replacing a bearing of a rotary electric machine, which comprises pulling out the fitting rod from the insertion hole of the rotary electric machine to which a bearing is newly attached. The method for replacing the bearing of the rotary electric machine according to claim 2.
By positioning the rotation phase of the rotor so that the rotor-side insertion groove faces the stator-side insertion groove, the insertion holes are placed on both ends of the stator and the rotor in the axial direction. The insertion hole forming process to be formed and
A fitting rod insertion step of inserting a fitting rod made of a non-magnetic material that is detachably fitted into the insertion hole into the insertion hole through the through hole and fitting the fitting rod.
A bearing removing step of removing the bearing of a rotary electric machine in which the fitting rod is fitted into the insertion hole from the rotating shaft and the bracket.
A bearing mounting process for mounting a new bearing on the rotating shaft and the bracket of the rotary electric machine from which the bearing has been removed, and
A method for replacing a bearing of a rotary electric machine, which comprises pulling out the fitting rod from the insertion hole and the through hole of the rotary electric machine to which a bearing is newly attached.

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