JP6748623B2 - Rotating electric machine and stator core damping structure - Google Patents

Description

The present invention relates to a rotating electric machine and a stator core damping structure.

In a rotating electric machine, in a rotor core and a stator core, iron loss due to an eddy current generated during operation causes heat generation, which causes a reduction in efficiency. Therefore, reducing the current flow inside the rotor core and the stator core is effective for ensuring the efficiency of the rotating electric machine.

For this reason, it is generally practiced to use a laminated core structure in which magnetic disk-shaped electromagnetic steel plates made of a ferromagnetic material and having an opening in the center are laminated in the axial direction for the rotor core and the stator core in the rotating electric machine. ing.

The stator iron core is arranged outside the radial direction of the rotor iron core so as to surround the rotor iron core via a gap, and is formed in a cylindrical shape as a whole. Further, on the radially inner surface of the stator core, there are formed a plurality of slots arranged at intervals in the circumferential direction and extending in the axial direction. The conductor of the stator winding is housed in each slot.

In order to form such a stator core, each of the magnetic steel sheets forming the laminated core structure is formed with a central opening and a recess corresponding to each slot. The electromagnetic steel sheets laminated in the axial direction are sandwiched by the inner clamper and the outer clamper arranged at both ends in the axial direction, and maintain the integral shape as a whole.

The inner clamper is provided to suppress the respective tooth portions formed by the adjacent slots formed in the laminated core structure, and the outer clamper is an electromagnetic steel sheet laminated in the axial direction via the inner clamper. Tightened from both sides in the axial direction.

JP 2000-50538 A

In a rotary electric machine of the rotary field type, during operation, the rotor is deformed into an elliptical shape in a plane perpendicular to the axis by rotation of a rotor having a predetermined number of poles having a magnetic attraction force. Vibration occurs (see Patent Document 1). The electromagnetic vibration that causes this annular vibration has a frequency twice that of the power supply frequency because it is due to the electromagnetic force between the poles of the stator.

In the rotary electric machine configured as described above, electromagnetic noise is generated due to electromagnetic vibration, which adversely affects on-site work. Further, even if the cause is other than electromagnetic vibration, if vibration occurs due to the rotation of the rotor, it causes noise.

Therefore, an object of the present invention is to reduce noise due to vibration of a stator in a rotary electric machine.

In order to achieve the above-mentioned object, the present invention provides a rotor having a rotor shaft that extends in the axial direction and is rotatably supported, and a rotor core that is attached to an outer side in the radial direction of the rotor shaft, and a gap. Is provided so as to surround the rotor core on the radial outside of the rotor core through a plurality of magnetic steel sheets and a plurality of magnetic steel sheets having a plurality of teeth formed on the radial inside in the axial direction. Cylindrical stator core having a plurality of clamp rods to be tightened and a vibration damping structure arranged in parallel with the plurality of clamp rods and extending in the axial direction, and a stator penetrating the inside of the stator core in the axial direction. a stator having a winding, a rotating electrical machine and a two bearings rotatably supporting the shaft direction of the rotor shaft on both sides of the rotor shaft across the rotor core, said system vibration structure, a through tube of the stator iron core or the part of the stator core is fixed at both ends to penetrate in the axial direction of the plurality of electromagnetic steel plates are formed so as to be clamped in the axial direction, the through And a damping element disposed in the tube.

The present invention also axially penetrates a cylindrical stator core having a rotor, a plurality of electromagnetic steel plates, and a plurality of clamp rods for axially tightening the plurality of electromagnetic steel plates, and the stator core. A stator having a stator winding, and a stator core damping structure of a rotating electric machine, comprising: the stator core or a part of the stator core penetrating in the axial direction and having both ends fixed. It is characterized by comprising a through pipe formed so that the plurality of electromagnetic steel plates can be tightened in the axial direction, and a damping element arranged in the through pipe.

According to the present invention, in a rotary electric machine, noise due to vibration of the stator can be reduced.

It is a longitudinal section showing the composition of the rotary electric machine concerning a 1st embodiment. It is an upper half part longitudinal cross-sectional view which shows the stator core of the rotary electric machine which concerns on 1st Embodiment, and the structure of the periphery of it. It is the side view seen from the axial direction which shows the composition of the stator core of the rotary electric machine concerning a 1st embodiment. FIG. 3 is a partial side view illustrating a part of a stator core of the rotating electric machine according to the first embodiment as seen from an axial direction. It is a longitudinal section showing the details of the damping structure of the stator core of the rotary electric machine concerning a 1st embodiment. It is a longitudinal cross-sectional view which shows the detail of the damping structure of the stator core of the rotary electric machine which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view which shows the damping structure of the stator core of the rotary electric machine which concerns on 3rd Embodiment. It is the side view seen from the axial direction which shows the structure of the stator core of the rotary electric machine which concerns on 4th Embodiment.

Hereinafter, a rotary electric machine and a stator core damping structure according to the present invention will be described with reference to the drawings. Here, parts that are the same or similar to each other are designated by common reference numerals, and redundant description will be omitted.

[First Embodiment]
FIG. 1 is a vertical cross-sectional view showing the configuration of the rotary electric machine according to the first embodiment. The rotary electric machine 200 has a rotor 10, a stator 20, a frame 60, two bearings 63, and two bearing brackets 65. Hereinafter, the direction in which the rotary shaft extends is referred to as the Z direction, the direction from the rotary shaft of the rotor toward the radial outside is the R direction, and the rotational direction of the rotor, that is, the circumferential direction is referred to as the θ direction.

The rotor 10 has a rotor shaft 11 and a rotor core 12. The rotor shaft 11 extends in the horizontal direction (Z direction) and is rotatably supported by bearings 63 at two locations. The rotor core 12 has a cylindrical shape and is attached to the outer side of the rotor shaft 11 in the radial direction (R direction).

The stator 20 has a stator core 21, a stator winding 28, and a plurality of vibration damping structures 100. The stator core 21 has a cylindrical shape, and is provided outside the rotor core 12 in the radial direction so as to surround the rotor core 12 via a gap 18.

The stator core 21 is composed of a plurality of disc-shaped electromagnetic steel plates 22 made of ferromagnetic materials laminated in the axial direction and having an opening in the center, and two inner plates provided on both outer sides of the electromagnetic steel plates 22 in the axial direction. The clamper 30 has two outer clampers 40 provided on the respective outer sides of the inner clampers 30 in the axial direction, and a plurality of clamp rods 50.

The plurality of clamp rods 50 are arranged at intervals in the circumferential direction, penetrate through the two outer clampers 40 in the axial direction, and clamp the two outer clampers 40 from the outside in the axial direction. Restrain a plurality of electromagnetic steel plates 22.

The stator winding 28 is housed in each of a plurality of stator slots 23 (FIG. 4) that are formed radially inward of the stator core 21 and are circumferentially spaced apart from each other and penetrate axially. 21 are connected to each other on the outer side in the axial direction, or are connected to an external wiring.

The two bearing brackets 65 are connected to both ends of the frame 60 in the axial direction, and each support the bearing 63 stationary.

The plurality of vibration damping structures 100 are arranged at intervals in the circumferential direction, and penetrate the stator core 21 in the axial direction.

FIG. 2 is an upper half partial vertical sectional view showing the structure of the stator core and its periphery. Further, FIG. 3 is a side view showing the structure of the stator core as seen from the axial direction. FIG. 4 is a partial side view illustrating a part of the stator core as seen from the axial direction. In FIG. 4, the outer clamper 40 is not shown for convenience of description.

The inner clamper 30 is a ring-shaped, that is, a disk-shaped plate that expands in the radial direction, has an opening in the center, and is a flat plate that is thicker in the axial direction than the electromagnetic steel plate 22. The outer diameter of the inner clamper 30 is substantially equal to the outer diameter of the laminated electromagnetic steel plates 22, and a plurality of tooth pressing portions 31 are formed along the circumferential direction of the central opening of the inner clamper 30. There is. Each of the plurality of tooth portion pressing portions 31 holds the stator tooth portion 24 formed by the plurality of laminated electromagnetic steel plates 22 from the axial outside.

The outer clamper 40 is a circular plate, that is, a disk shape that is expanded in the radial direction, has an opening in the center, is a flat plate that is thicker in the axial direction than the electromagnetic steel plate 22, and is expanded radially outward than the inner clamper 30. The outer diameter of the outer clamper 40 is larger than the outer diameter of the inner clamper 30, and the diameter of the opening 40a of the outer clamper 40 is the root of the tooth pressing portion 31 of the inner clamper 30, that is, the portion having the largest outer diameter. Larger than the diameter of. A taper is formed at the edge of the opening 40a such that the thickness in the axial direction becomes thinner toward the inner side in the radial direction.

The plurality of clamp rods 50 are arranged at intervals in the circumferential direction (θ direction) as described above. The plurality of clamp rods 50 are arranged such that their center positions in the radial direction (R direction) are substantially the same as the outermost radial positions of the plurality of electromagnetic steel plates 22 and the inner clamper 30. Therefore, through holes are formed in the outer clamper 40 at the respective positions where the plurality of clamp rods 50 extend in the axial direction (Z direction), and the notches are formed in the plurality of electromagnetic steel plates 22 and the inner clamper 30, respectively. 22a and a notch 30a are formed.

The plurality of vibration damping structures 100 are arranged at positions radially inward of the plurality of clamp rods 50 and spaced from each other. As shown in FIG. 2, each of the plurality of vibration damping structures 100 has a through pipe 110 and a damping element 115 mounted in the through pipe 110. The damping structure 100 may be a single structure instead of a plurality. The damping element 115 will be described later with reference to FIG.

The through-tube 110 is a hollow tube having a constant cross-sectional shape, and penetrates the laminated electromagnetic steel plates 22, the inner clamper 30, and the outer clamper 40 in the axial direction (Z direction). The cross-sectional shape of each through tube 110 is, for example, a circular shape, a polygonal shape, or a combination thereof. Both ends of the through tube 110 project to the outside in the axial direction of the outer clamper 40. Moreover, the through-tube 110 is fixed to the outer clamper 40 at both ends thereof and is restrained from moving in the axial direction. FIG. 2 shows an example in which male threads are formed at both ends of the through-tube 110, which are respectively screwed into the nuts 111, and are axially tightened and fixed by the nuts 111. As another mode for fixing the through tube 110, movement in the Z direction may be restricted by using a pin or the like that radially penetrates the end portion.

As shown in FIG. 4, the stator tooth portion 24 formed by laminating a plurality of electromagnetic steel plates 22 in the axial direction is axially moved by the tooth pressing portion 31 of the inner clamper 30 at the axial end portion thereof. Being bound by. The tooth pressing portion 31 of the inner clamper 30 is smaller than the stator tooth portion 24 and is retracted to the side opposite to the stator slot 23 so as not to project to the stator slot 23 side.

FIG. 5 is a vertical sectional view showing details of the vibration damping structure of the stator core. As described above, the vibration damping structure 100 includes the through pipe 110 that axially penetrates the two outer clampers 40, the two inner clampers 30, and the plurality of electromagnetic steel plates 22 of the stator 20, and the inside of the through pipe 110. It has a damping element 115 arranged. Both ends of the through tube 110 are closed by a closing lid 112, and a closed space is formed inside. The closing lid 112 is attached by screwing, for example, but may be attached by other mechanical structure or welding.

The damping element 115 is, for example, a plurality of movable masses. The shape of the lump may be various shapes such as an ellipsoid, a rectangular parallelepiped, and an irregular solid, and the shape does not need to be uniform, and a combination of various shapes may be used. A plurality of lumps that do not slide smoothly with each other but consume energy due to large friction or the like are used.

The damping element 115 may instead of a plurality of movable masses, for example, trap a plurality of irregularly shaped rods so that when the stator 20 vibrates, the rods rub against each other. Energy may be consumed by shifting while matching.

With the configuration of the present embodiment as described above, when vibration occurs in the stator 20, energy is consumed by the damping element in the vibration damping structure 100, and noise due to vibration of the stator 20 can be reduced.

[Second Embodiment]
FIG. 6 is a vertical cross-sectional view showing details of the vibration damping structure of the stator core of the rotary electric machine according to the second embodiment. This embodiment is a modification of the first embodiment. In the first embodiment, the damping element 115 is a plurality of movable masses, while the damping element 120 in the second embodiment is a mechanical element. .. Further, in the case of the present embodiment, the closing lid 112 of the through pipe 110 in the first embodiment does not necessarily have to be provided.

The damping element 120 has a cylindrical container 121, a fixed shaft 122, and a movable weight 123. As shown in FIG. 2, the damping element 120 is fixed in the through pipe 110 and extends in the longitudinal direction (Z direction) of the through pipe 110. The longitudinal position in the through tube 110 to which the damping element 120 is fixed may be an arbitrary position, but if a location that easily absorbs the energy of vibration of the rotating electric machine 200 can be identified by analysis or the like, it is installed at such a location. To do.

The shape of the outer surface of the side portion 121a of the cylindrical container 121 is a shape corresponding to the shape of the inner surface of the through tube 110. Although fixed installation of the cylindrical container 121 in the through tube 110 is not shown, it is mechanically fixed by using a fixing member. It should be noted that instead of mechanical fixing, it may be fixed by welding or the like.

The tubular container 121 has a side portion 121a extending in a longitudinal direction in a tubular shape, and two end portions 121b. The side part 121a is formed so that the shape of the inner surface is constant in the longitudinal direction. The two ends 121b of the cylindrical container 121 are attached to both ends of the side part 121a in the longitudinal direction, and form a closed space 127 together with the side part 121a.

The fixed shaft 122 extends parallel to the longitudinal direction of the tubular container 121, and both ends thereof are fixed to the end portions 121b. The position of the fixed shaft 122 in the cross section of the tubular container 121 is substantially in the center of the cross section of the tubular container 121.

The movable weight 123 is a hollow column having a hollow 125 and extending in the longitudinal direction (Z direction). The outer surface in the radial direction of the movable weight 123 is slidably opposed to the inner surface of the cylindrical container 121 with a small clearance. The length of the movable weight 123 in the Z direction is shorter than the length of the inner space of the cylindrical container 121 in the Z direction, and the closed space 127 inside the cylindrical container 121 is arranged in the Z direction in the first space 127a and the second space. It is divided into 127b.

The fixed shaft 122 penetrates the movable weight 123 so as to be slidable with respect to the movable weight 123. The penetrating portion of the movable weight 123 of the fixed shaft 122 may not be completely sealed and may have some leakage.

At least one communication hole 124 is formed in the movable weight 123. The communication hole 124 penetrates through the movable weight 123 in the Z direction. Further, the diameter of the communication hole 124 is formed smaller than a predetermined size, and serves as a throttle for the fluid passing therethrough.

The size of the cavity 125 of the movable weight 123 may be set in consideration of the vibration energy reduction effect described later or the structural soundness of the damping element 120. The cavity 125 is for adjusting the chamber force of the movable weight 123, and may not be provided if not necessary.

The fluidized medium 126 is filled inside the cylindrical container 121. That is, the fluid medium 126 fills the first space 127a, the second space 127b, the communication hole 124, and the cavity 125 inside the movable weight 123. The fluid medium 126 is, for example, a viscous fluid such as oil having high viscosity.

A flow path 130 for the fluidized medium 126 is formed between the first space 127a and the second space 127b. Specifically, the communication hole 124, the gap between the cylindrical container 121 and the movable weight 123, and the gap between the movable weight 123 and the fixed shaft 122 are elements that configure the flow path 130.

As described above, the damping element 120 has the movable weight 123, which is a movable portion movable in the tubular container 121, against the flow resistance of the fluid medium 126.

In the damping element 120 configured as described above, when the acceleration α is applied to the movable weight 123 in the Z direction, or when the component of the acceleration in the Z direction is α, the mass of the movable weight 123 is set to M. For example, the force of Mα acts in the Z direction. The force in the Z direction causes the movable weight 123 to move in the Z direction. As a result, the fluidized medium 126 in the second space 127b tends to move to the first space 127a side. The flow path of the fluid medium 126 at this time is a clearance between the communication hole 124, the movable weight 123 and the cylindrical container 121, and a clearance between the movable weight 123 and the fixed shaft 122 penetrating the movable weight 123.

The larger the mass of the movable weight 123 and the larger the flow resistance when the fluid medium 126 moves between the first space 127a and the second space 127b, the more effective the reduction of vibration energy described later. Have. However, the larger these are, the larger the load that the movable weight 123 exerts on other components in the damping element 120 becomes. Therefore, for example, the flow resistance is infinite, that is, between the first space 127a and the second space 127b. Even if there is no flow path, each element of the damping element 120 is configured to maintain its structural soundness. Alternatively, the mass of the movable weight 123 and, for example, the flow passage area, which provides the flow resistance, are set within a range in which each element of the damping element 120 can maintain the structural soundness.

Next, the operation and effect of this embodiment will be described.

When the stator core 21 of the rotating electric machine 200 is vibrating, the through pipe 110 also vibrates. As a result, the damping element 120 installed in the through pipe 110 also vibrates. At this time, when acceleration in the Z direction is generated in the movable weight 123 provided in the damping element 120, the movable weight 123 tries to move in the Z direction.

When the movable weight 123 tries to move in the positive Z direction, the fluidized medium 126 in the second space 127b moves to the first space 127a side, that is, in the negative direction in the Z direction. A flow resistance is generated when the flowing medium 126 passes through the flow path, and becomes a resistance against the movement of the movable weight 123. Further, due to the flow resistance, a part of the vibration energy is changed into heat energy or the like.

In the vibration phenomenon, since the acceleration acting on the movable weight 123 changes in the positive direction and the negative direction in the Z direction and the repeating direction, the flowing direction of the flowing medium 126 also changes in the negative direction and the positive direction. To do. Therefore, the vibration energy is continuously converted to a part of the heat energy due to the generation of the flow resistance. As a result, vibration in the rotary electric machine 200 is reduced.

As described above, according to the present embodiment, it is possible to reduce the vibration of the stator 20 and the noise due to the vibration.

[Third Embodiment]
FIG. 7 is a vertical cross-sectional view showing the vibration damping structure of the stator core of the rotating electric machine according to the third embodiment. This embodiment is a modification of the second embodiment.

In the second embodiment, the damping element 120 is arranged such that the longitudinal direction thereof is the longitudinal direction of the through tube 110, that is, the Z direction. However, in the third embodiment, the longitudinal direction is the Z direction. The plurality of damping elements 120 are arranged in parallel with each other in the Z-direction with a space therebetween in the Z direction, with the longitudinal direction thereof being the radial direction (R direction). The other points are similar to those of the second embodiment. It should be noted that the damping elements 120 are not necessarily spaced apart from each other, and may be in close contact with each other in the Z direction.

In the present embodiment, when acceleration in the R direction is applied to the damping element 120, the effect of absorbing vibration energy is increased. For example, the electromagnetic vibration of the stator 20 is a vibration in which the first-order mode is the vibration of an annular four node having four nodes in the circumferential direction, and at each position in the circumferential direction, the electromagnetic vibration occurs in the radial direction. Is the vibration that increases and decreases. In such vibration, the function of the vibration damping structure 100 according to the present embodiment can be effectively exhibited.

[Fourth Embodiment]
FIG. 8 is a side view showing the configuration of the stator core of the rotating electric machine according to the fourth embodiment as viewed from the axial direction. This embodiment is a modification of the first embodiment. In the first embodiment, the vibration damping structure 100 is provided inside the plurality of clamp rods 50 in the radial direction (R direction), but in the fourth embodiment, the vibration damping structure 100 and the plurality of vibration damping structures 100 are provided. And the clamp rods 50 are arranged at the same radial position and spaced from each other. The other points are the same as those in the first embodiment.

Although FIG. 8 shows a case where the plurality of vibration damping structures 100 and the plurality of clamp rods 50 are alternately arranged, the present invention is not limited to this. That is, it may be a case where one or a plurality of vibration damping structures 100 whose number is smaller than the number of the clamp rods 50 are arranged in the plurality of clamp rods 50 arranged in the circumferential direction.

Further, in the present embodiment, the vibration damping structure 100 may be formed so that the two outer clampers 40 can be tightened inward in the axial direction from the outer sides in the axial direction of the two outer clampers 40, similarly to the clamp rod 50. ..

Further, as a modification of the fourth embodiment, instead of the clamp rod 50, all of them may be the vibration damping structure 100 having a tightening function.

In the fourth embodiment configured as described above, since the radial position of the vibration damping structure 100 is far from the center of rotation, that is, the radial distance R is large, the amplitude of the electromagnetic vibration of the stator 20 is further increased. Since it is arranged in a large place, the effect of reducing vibration becomes great. Further, since the vibration damping structure 100 is not arranged inside the electromagnetic steel plate 22, the degree of disturbance of the magnetic flux passage in the stator core 21 is small, which is advantageous in ensuring the efficiency of the rotary electric machine 200.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. For example, in the embodiment, the case where the rotor shaft is a horizontal rotary electric machine that extends in the horizontal direction is shown as an example, but the present invention is not limited to this. It may be a vertical rotating electric machine in which the rotor shaft extends in the vertical direction.

Further, the features of the respective embodiments may be combined. For example, the characteristic of the third embodiment, that is, the damping element 120 is arranged with its longitudinal direction in the radial direction (R direction), and the characteristic of the fourth embodiment, that is, the radial distance of the damping structure 100. You may combine with the characteristic that R is large. Alternatively, the first embodiment or the third embodiment may be combined with the feature that the vibration damping structure 100 of the fourth embodiment is formed so that it can be tightened like the clamp rod 50.

Furthermore, the 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. The embodiments and the modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and the gist of the invention.

10... Rotor, 11... Rotor shaft, 12... Rotor core, 18... Air gap, 20... Stator, 21... Stator core, 22... Electromagnetic steel plate, 22a... Notch, 23... Stator slot, 24... Fixed Child tooth portion, 28... Stator winding, 30... Inner clamper, 30a... Notch, 31... Tooth portion pressing portion, 40... Outer clamper, 40a... Opening, 50... Clamp rod, 60... Frame, 63... Bearing, 65... Bearing bracket, 100... Damping structure, 110... Penetration pipe, 111... Nut, 112... Closing lid, 115, 120... Damping element, 121... Cylindrical container, 121a... Side part, 121b... End part, 122... Fixed shaft, 123... Movable weight, 124... Communication hole, 125... Cavity, 126... Fluid medium, 127... Sealed space, 127a... First space, 127b... Second space, 130... Flow path, 200... Rotating electric machine

Claims (5)

A rotor having a rotor shaft that extends in the axial direction and is rotatably supported, and a rotor core that is attached to the outer side in the radial direction of the rotor shaft,
Provided so as to surround the rotor core on the outer side in the radial direction of the rotor core with a gap, the plurality of electromagnetic steel plates and a plurality of electromagnetic steel plates in which a plurality of teeth are formed on the inner side in the radial direction A cylindrical stator core having a plurality of clamp rods for tightening in the axial direction and a vibration damping structure that is arranged in parallel with the plurality of clamp rods and extends in the axial direction; A stator having a stator winding passing through
And two bearings for rotatably supporting the rotor shaft on both sides of the axial direction of the rotor shaft across the rotor core,
A rotating electric machine comprising:
The damping structure is
A penetrating pipe formed by penetrating a part of the stator iron core or the stator iron core in the axial direction and fixing both ends of the plurality of electromagnetic steel plates so that the electromagnetic steel plates can be tightened in the axial direction .
A damping element arranged in the through pipe,
A rotating electrical machine comprising: The damping element is
A tubular container that extends in the axial direction and is filled with a fluid medium inside, and is fixed to the through pipe,
A movable weight that is movable in the axial direction in the cylindrical container and divides a space in the cylindrical container into a first space and a second space in the axial direction;
Have
A flow path of the fluidized medium is formed between the first space and the second space,
The rotary electric machine according to claim 1, wherein The damping element is
A tubular container fixed to the through pipe, the fluid medium being filled inside to extend in the radial direction ,
A movable weight for dividing the space of the tubular within an a movable in the radial direction container the cylindrical container into a first space and a second space in the radial direction,
Have
A flow path of the fluidized medium is formed between the first space and the second space,
The rotary electric machine according to claim 1, wherein The rotary electric machine according to claim 2 or 3, wherein the through pipe is provided at the same radial position as the plurality of clamp rods . A rotor, a cylindrical stator core having a plurality of electromagnetic steel plates and a plurality of clamp rods for axially tightening the plurality of electromagnetic steel plates, and a stator winding that penetrates the stator core in the axial direction. A stator core damping structure for a rotating electrical machine comprising:
A penetrating pipe formed by penetrating a part of the stator core or the stator core in the axial direction and fixing both ends of the plurality of electromagnetic steel plates so that the electromagnetic steel plates can be tightened in the axial direction.
A damping element arranged in the through pipe,
Stator core damping structure characterized by comprising.

Images