JP6089100B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine that uses a permanent magnet as a rotor, and relates to a rotating electrical machine that can improve the workability of a rotor insertion and assembly operation.

  A rotating electrical machine such as an electric motor including an inner rotor has a structure in which a stator and a rotor disposed inside the stator face each other across a narrow gap (see Patent Document 1). When such a rotating electrical machine is manufactured in a manufacturing plant, a dedicated jig can be used to insert the rotating portion inside the stator.

  On the other hand, for the maintenance of the rotating electrical machine, it is possible to take out the rotating part from the inside of the stator and insert it inside the stator again without using a dedicated jig outside the manufacturing factory of the rotating electrical machine. May be necessary.

JP 2003-47188 A

  In a rotating electrical machine in which a permanent magnet is used for the rotor of the inner rotor, when the rotor is inserted inside the stator, the rotor may be attracted to the stator core by the magnetic force of the permanent magnet. In that case, the rotor and the stator core may collide with each other, and the inner surface of the stator core may be damaged, resulting in poor workability. Further, metal powder generated when the rotor and the stator iron core collide may cause deterioration in performance of the rotating electrical machine.

  The present invention has been made in view of such circumstances, and an object of the present invention is to improve workability when a rotor is inserted inside a stator in a rotating electrical machine in which a permanent magnet is used for a rotor of an inner rotor. And to suppress the generation of metal powder caused by the collision between the rotor and the stator core.

In order to achieve the above object, one aspect of a rotating electrical machine according to the present invention includes a shaft that extends in the horizontal direction and is rotatably supported, a rotor attached to the shaft, and the rotor that is rotatable. A steel plate having a substantially circular opening surrounding the outer side in the radial direction of the rotor by forming a gap between the plurality of bearings supported on the outer side and the outer side in the radial direction of the rotor, and extending in a direction perpendicular to the axis A stator having a stator core laminated in an axial direction, and a frame that supports the bearing and the stator, and the rotor attached to the shaft is connected to the opening of the stator core. The rotor can be assembled by being inserted in the axial direction on the rotor, and the rotor includes a rotor core in which a plurality of steel plates spread in a direction perpendicular to the axis are stacked in the axial direction, and the rotor core Multiple eternity inserted in A magnet, two flat disk-shaped clampers that are arranged with the rotor core sandwiched in the axial direction and spread in a direction perpendicular to the axis, and a pulling force in a direction in which the two clampers approach each other A plurality of tightening bolts arranged so as to be applied, and a tip clamper on the side inserted first when the rotor is inserted axially into the opening of the stator core among the two clampers is arranged, and the tip clamper and protrudes radially outward from the rotor core, Ri Do a softer material than the stator core, the sliding portion which is removably attached to the tip clamper by screws, It is characterized by having.
Another aspect of the rotating electrical machine according to the present invention includes a shaft that extends horizontally and is rotatably supported, a rotor attached to the shaft, and a plurality of bearings that rotatably support the rotor. And a steel plate spread in a direction perpendicular to the axis is formed in the axial direction by forming a gap between the outer side in the radial direction of the rotor and forming a substantially circular opening surrounding the outer side in the radial direction of the rotor. A stator provided with a stator core, and a frame that supports the bearing and the stator, and the rotor attached to the shaft is inserted into the opening of the stator core in the axial direction. The rotor includes a rotor core in which a plurality of steel plates spread in a direction perpendicular to an axis are stacked in an axial direction, and a plurality of rotor cores inserted into the rotor core. A permanent magnet and the rotor iron Are arranged so that a tensile force is applied in the direction in which the two clampers approach each other, and two flat disc-shaped clampers that are arranged in a direction perpendicular to the axis. A plurality of tightening bolts and a tip end clamper which is inserted first when the rotor of the two clampers is inserted into the opening of the stator core in the axial direction. A sliding portion that protrudes radially outward from the clamper and the rotor core and is made of a softer material than the stator core, and is attached to a surface of the tip clamper opposite to the rotor core, and the sliding And an internal fan disposed radially inward of the portion, and a buffer portion is disposed on the outer peripheral portion of the internal fan in the axial direction.

  According to the present invention, in a rotating electrical machine in which a permanent magnet is used for the rotor of the inner rotor, the workability when the rotor is inserted inside the stator is improved, and the rotor and the stator core are Generation | occurrence | production of the metal powder which arises by colliding can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole elevation view which shows the assembly completion state in 1st Embodiment of the rotary electric machine which concerns on this invention, Comprising: It is a figure which shows a lower half with sectional drawing and a lower half with an external view. It is a whole elevation sectional view showing the situation before the starting of rotor insertion work in a 1st embodiment of the rotating electrical machine concerning the present invention. FIG. 3 is an essential part elevational cross-sectional view showing an upper portion of the rotor tip in the initial stage of the rotor insertion operation and its periphery in the first embodiment of the rotating electrical machine according to the present invention. FIG. 3 is a main part vertical sectional view showing the upper end of the rotor tip and its periphery at the end of the rotor insertion work in the first embodiment of the rotating electrical machine according to the present invention. It is principal part sectional drawing which shows the rotor tip upper part of the initial stage of the rotor insertion work in 2nd Embodiment of the rotary electric machine which concerns on this invention, and its periphery. It is principal part sectional drawing which shows the rotor front-end | tip upper part of the final stage of the rotor insertion operation | work in 2nd Embodiment of the rotary electric machine which concerns on this invention, and its periphery. It is a principal part expanded sectional view which shows the front-end | tip upper part of the internal fan in 3rd Embodiment of the rotary electric machine which concerns on this invention. It is principal part elevation sectional drawing which shows the rotor tip upper part of the initial stage of the rotor insertion operation | work in 4th Embodiment of the rotary electric machine which concerns on this invention, and its periphery.

  Embodiments of a rotating electrical machine according to the present invention will be described below with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an overall elevation view showing an assembly completion state in a first embodiment of a rotating electrical machine according to the present invention, in which an upper half is a sectional view and a lower half is an outline view. FIG. 2 is an overall vertical sectional view showing a state before starting the rotor insertion work in the first embodiment of the rotating electrical machine according to the present invention. FIG. 3 is a principal sectional elevational view showing the upper end of the rotor tip and its periphery in the initial stage of the rotor insertion operation in the first embodiment of the rotating electrical machine according to the present invention. FIG. 4 is a principal sectional elevational view showing the upper end of the rotor tip and its periphery at the end of the rotor insertion operation in the first embodiment of the rotating electrical machine according to the present invention.

  In the electric motor 10 that is the rotating electric machine according to the first embodiment of the present invention, as shown in FIGS. 1 and 2, a stator 12 is attached in a frame 11, and two bearings 13 are supported by the frame 11. ing. A shaft 14 extending in the horizontal direction is rotatably supported by the bearing 13. A rotor 15 is attached to the outside of the shaft 14.

  The stator 12 includes a stator core 16 and a stator coil 17. The stator core 16 is configured by laminating a large number of steel plates extending perpendicularly to the rotation axis in the direction of the rotation axis. A plurality of slots (not shown) extending in the axial direction are formed in the stator iron core 16, and a stator coil 17 (see FIG. 2) is disposed in these slots. The axial ends of the stator coil 17 are connected to each other by a coil end 19. A substantially circular opening 20 is formed in the central portion of the stator core 16 in the radial direction, and the rotor 15 is disposed in the opening 20 via a gap in the radial direction.

  The rotor 15 includes a rotor core 21 configured by laminating a plurality of steel plates extending perpendicular to the rotation axis in the direction of the rotation axis, and a plurality of permanent magnets 22 inserted into the rotor core 21. . A front end clamper 23 and a rear end clamper 24 are disposed at both ends of the rotor core 21 in the axial direction. The front end clamper 23 and the rear end clamper 24 have a disk shape having an opening at the center and extending perpendicularly to the rotation axis, and are thicker than each steel plate constituting the rotor core 21.

  The front end clamper 23 and the rear end clamper 24 are tightened in a direction approaching each other by a plurality of tightening bolts 25 penetrating them and nuts 26 screwed into them, and the tightening force causes the rotor core 21 to move. A large number of steel plates constituting the plate are fastened together.

  The rotor 15 is inserted into the opening 20 from the axial direction together with the shaft 14 and the bearing 13 and assembled. At this time, the rotor 15 and the like are inserted from the load side end of the frame 11, and the front end clamper 23, which is the anti-load side clamper, becomes the back side.

  A sliding portion 30 is attached along the outer periphery of the tip clamper 23. The sliding portion 30 is annular, and protrudes radially outward from the outer periphery of the tip clamper 23 and the rotor core 21. The sliding portion 30 is softer than the stator core 16 and the coil end 19 so that the stator core 16 and the coil end 19 are not damaged even if the sliding portion 30 comes into contact with the opening 20 of the stator core 16 and the portion that contacts the coil end 19. The material has a certain degree of mechanical strength, wear resistance, and heat resistance. For example, it is made of resin such as engineering plastic, and more specifically, Teflon (trade name), MC nylon (trade name), and the like are preferable.

  As shown in FIGS. 3 and 4, the sliding portion 30 protrudes in the axial direction opposite to the stator core 16 (that is, the anti-load side), and a chamfered portion 31 is formed at the tip portion thereof. In other words, the chamfered portion 31 gradually becomes thinner toward the tip in the axial direction. The sliding portion 30 is detachably attached to the tip clamper 23 with a screw 32.

  As shown in FIG. 1, an external fan 60 is attached near the tip of the shaft 14 on the side opposite to the load, and the outside of the external fan 60 is covered with a fan cover 61.

  After the rotary electric machine according to this embodiment is installed, the rotor 15 or the like may be taken out of the frame 11 and returned to the frame 11 again for maintenance or the like. In the case of such reassembly, first, as shown in FIG. 2, with the rotor 15 and the bearing 13 attached to the shaft 14, the axes of the fixed portion and the rotating portion are aligned, and the rotating portion is horizontal in the axial direction. Move to. At this time, the fan cover 61 is removed from the frame 11 and the external fan 60 is removed from the shaft 14.

  Generally, since the radial gap between the opening 20 of the stator 12 and the rotor core 21 is small and the permanent magnet 22 is inserted into the rotor core 21, the rotor core 21 or the tip clamper 23 is fixed. There is concern about collision with the surface of the opening 20 of the child 12. However, in this embodiment, since the sliding portion 30 protrudes radially outward and axially forward of the tip clamper 23, the sliding portion collides with the surface of the opening 20 of the stator 12 and the coil end 19. 30. Since the sliding portion 30 is a softer material than the stator core 16 and the coil end 19, damage to the stator core 16 and the coil end 19 can be suppressed even if this collision occurs. Moreover, generation | occurrence | production of the metal powder by damage to the stator core 16 and the coil end 19 can be suppressed, and the performance deterioration of the rotary electric machine by generation | occurrence | production of metal powder can be suppressed.

  Further, since the sliding portion 30 is detachably attached by the screw 32, the sliding portion 30 can be replaced with a new one when the sliding portion 30 is further damaged.

  In addition, since the chamfered portion 31 is formed at the tip of the sliding portion 30, the tip of the sliding portion 30 is unlikely to collide with the stator core 16. Damage to the tip of the moving part 30 can be reduced. In addition, the rotating part can be inserted smoothly.

  In the above description, the sliding portion 30 is detachably attached to the tip clamper 23 with the screw 32. However, the sliding portion 30 is not necessarily detachable. For example, the sliding portion 30 may be attached with an adhesive or coated. May be. Thereby, damage to the stator core 16 and generation of metal powder can be suppressed.

  In the above description, the sliding portion 30 is made of a softer material than the stator core 16 and the coil end 19, but interference with the coil end 19 occurs when the rotor 15 or the like is inserted into the stator 12. When it does not become a problem, the sliding part 30 should just be a material softer than the stator core 16. FIG.

[Second Embodiment]
FIG. 5 is an essential part sectional view showing an upper portion of the rotor tip in the initial stage of the rotor insertion operation and its periphery in the second embodiment of the rotating electrical machine according to the present invention. FIG. 6 is an essential part sectional view showing the upper end of the rotor tip and its periphery in the final stage of the rotor insertion work in the second embodiment of the rotating electrical machine according to the present invention.

  An internal fan 40 is attached to the opposite side of the rotor core 21 of the front end clamper 23 of the rotating electrical machine of this embodiment, that is, the opposite load side. The internal fan 40 is provided so as to protrude in the axial direction on the opposite side of the rotor core 21. However, the internal fan 40 is configured not to protrude outward in the radial direction from the sliding portion 30 and to become smaller in the radial direction toward the tip in the axial direction. Other configurations are the same as those in the first embodiment.

  The internal fan 40 can rotate with the rotor 15 to circulate the air in the frame 11 and cool it.

  According to this embodiment, even in the rotating electrical machine including the internal fan 40, when the rotor 15 or the like is inserted into the stator 12 as in the first embodiment, the stator core 16 and the coil end 19 are Damage and generation of metal powder can be suppressed. In particular, since the tip of the internal fan 40 is tapered, it is possible to suppress the tip of the internal fan 40 from colliding with the stator core 16 and the coil end 19.

[Third Embodiment]
FIG. 7 is an enlarged cross-sectional view of a main part showing an upper end portion of an internal fan in a third embodiment of the rotating electrical machine according to the present invention.

  This embodiment is a modification of the second embodiment, and a chamfered portion 41 is formed on the outer front end of the internal fan 40. A buffer portion 42 is formed around the chamfered portion 41. The buffer portion 42 is made of a material softer than the stator core 16 and the coil end 19 and has a certain degree of mechanical strength, wear resistance, and heat resistance. For example, it is made of resin such as engineering plastic, and more specifically, Teflon (trade name), MC nylon (trade name), and the like are preferable. The buffer portion 42 may be attached to the surface of the internal fan 40 by screwing or bonding, or may be attached by coating.

  According to this embodiment, when inserting the rotor 15 or the like into the stator 12, the same effects as those of the second embodiment can be obtained, damage to the stator core 16 and the coil end 19, and metal The generation of powder can be further suppressed.

[Fourth Embodiment]
FIG. 8 is a vertical sectional view of a main part showing an upper portion of the rotor tip and its periphery in the initial stage of the rotor insertion operation in the fourth embodiment of the rotating electrical machine according to the present invention.

  This embodiment is a modification of the first embodiment, and a guide portion 50 is attached to the tip clamper 23 so as to protrude in the axial direction on the opposite side of the rotor core 21. The guide part 50 has a substantially cylindrical shape whose outer diameter is smaller than the outer diameter of the sliding part 30, and is narrowed toward the tip. The guide part 50 is attached to the tip clamper 23 together with the sliding part 30 by a screw 32.

  When the guide portion 50 is inserted into the opening 20 of the stator core 16, the stator core does not damage the stator core 16 or the coil end 19 even if it abuts against the stator core 16 or the coil end 19. The material is softer than 16 and the coil end 19 and has a certain degree of mechanical strength, wear resistance, and heat resistance. For example, it is made of resin such as engineering plastic, and more specifically, Teflon (trade name), MC nylon (trade name), and the like are preferable.

  The configuration other than the above is the same as that of the first embodiment.

  In this embodiment, since the guide portion 50 protrudes at the tip in the axial direction, when the rotor 15 or the like is inserted into the stator 12, it first collides with the surface of the opening 20 of the stator 12 or the coil end 19. The guide part 50 becomes. Since the guide portion 50 is narrowed toward the tip, it can be prevented from colliding with the stator core 16 and the coil end 19 and the inserting operation of the rotating portion becomes smooth. Moreover, even if it contacts with a scale, since the guide part 50 is a material softer than the stator core 16 and the coil end 19, even if this collision exists, damage to the stator core 16 and the coil end 19 can be suppressed. it can. Moreover, generation | occurrence | production of the metal powder by damage to the stator core 16 and the coil end 19 can be suppressed, and the performance deterioration of the rotary electric machine by generation | occurrence | production of metal powder can be suppressed.

  Moreover, since the guide part 50 is detachably attached by the screw 32 similarly to the sliding part 30, when the damage of the guide part 50 advances, the guide part 50 can be replaced with a new one.

[Other Embodiments]
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Electric motor 11 Frame 12 Stator 13 Bearing 14 Shaft 15 Rotor 16 Stator iron core 17 Stator coil 19 Coil end 20 Opening 21 Rotor iron core 22 Permanent magnet 23 Front end clamper 24 Rear end clamper 25 Tightening bolt 26 Nut 30 Sliding part 31 Chamfered portion 32 Screw 40 Internal fan 41 Chamfered portion 42 Buffer portion 50 Guide portion 60 External fan 61 Fan cover

Claims (12)

A shaft that extends horizontally and is rotatably supported;
A rotor attached to the shaft;
A plurality of bearings for rotatably supporting the rotor;
A steel plate is formed in which a gap is formed between the outer side in the radial direction of the rotor and a substantially circular opening surrounding the outer side in the radial direction of the rotor is formed so that the steel plates spread in the direction perpendicular to the axis are stacked in the axial direction. A stator with a core,
A frame that supports the bearing and the stator;
A rotating electrical machine that can be assembled by axially inserting the rotor attached to the shaft into the opening of the stator core,
The rotor is
A rotor core in which a plurality of steel plates spread in a direction perpendicular to the axis are laminated in the axial direction;
A plurality of permanent magnets inserted into the rotor core;
Two flat disc-shaped clampers that are arranged with the rotor core sandwiched between them in the axial direction and each spread in a direction perpendicular to the axis;
A plurality of fastening bolts arranged such that a tensile force is applied in a direction in which the two clampers approach each other;
Of the two clampers, the rotor is disposed on a tip clamper that is inserted first when the rotor is inserted into the opening of the stator core in the axial direction. From the tip clamper and the rotor core, and also protrude radially outward, Ri Do a softer material than the stator core, the sliding portion which is removably attached to the tip clamper by screws,
A rotating electrical machine. 2. The rotating electrical machine according to claim 1 , further comprising an internal fan attached to a surface of the tip clamper opposite to the rotor iron core and disposed radially inward of the sliding portion. . A shaft that extends horizontally and is rotatably supported;
A rotor attached to the shaft;
A plurality of bearings for rotatably supporting the rotor;
A steel plate is formed in which a gap is formed between the outer side in the radial direction of the rotor and a substantially circular opening surrounding the outer side in the radial direction of the rotor is formed so that the steel plates spread in the direction perpendicular to the axis are stacked in the axial direction. A stator with a core,
A frame that supports the bearing and the stator;
A rotating electrical machine that can be assembled by axially inserting the rotor attached to the shaft into the opening of the stator core,
The rotor is
A rotor core in which a plurality of steel plates spread in a direction perpendicular to the axis are laminated in the axial direction;
A plurality of permanent magnets inserted into the rotor core;
Two flat disc-shaped clampers that are arranged with the rotor core sandwiched between them in the axial direction and each spread in a direction perpendicular to the axis;
A plurality of fastening bolts arranged such that a tensile force is applied in a direction in which the two clampers approach each other;
Of the two clampers, the rotor is disposed on a tip clamper that is inserted first when the rotor is inserted into the opening of the stator core in the axial direction. From the tip clamper and the rotor core, Projecting radially outward, and a sliding portion made of a material softer than the stator core,
An internal fan attached to a surface of the tip clamper opposite to the rotor core and disposed radially inward of the sliding portion;
Have
A dynamoelectric machine characterized in that a buffering portion is disposed on the outer peripheral portion of the inner fan in the axial direction . The rotating electrical machine according to claim 3 , wherein the sliding portion is formed by coating the tip clamper with a material softer than the stator core . The rotating electrical machine according to any one of claims 2 to 4, wherein the internal fan is tapered toward an axial front end . The rotating electrical machine according to any one of claims 1 to 5, wherein the sliding portion is made of resin . The sliding portion is formed with a chamfer that is tapered toward the tip on the side to be inserted first when the rotor is inserted into the opening of the stator core in the axial direction. The rotating electrical machine according to any one of claims 1 to 6 . 8. The apparatus according to claim 1, further comprising a guide portion that is attached to the tip clamper and protrudes in an axial direction opposite to the rotor core and made of a material softer than the stator core. The rotating electrical machine according to any one of the above. The rotating electrical machine according to claim 8 , wherein the guide portion is detachably attached to the tip clamper . The rotating electrical machine according to claim 8 , wherein the guide portion is formed by coating a material softer than the stator core . The rotating electrical machine according to any one of claims 8 to 10, wherein the guide portion is made of resin . The guide portion is formed with a chamfer that is tapered toward the tip on the side to be inserted first when the rotor is inserted into the opening of the stator core in the axial direction. The rotating electrical machine according to any one of claims 8 to 11 .

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