JP2021023055A - Method of adjusting unbalance of rotor - Google Patents

Abstract

To efficiently adjust the unbalance while suppressing the expansion of the motor's physique.SOLUTION: A laminated steel sheet 11 and an end plate 12 disposed on an edge side in a lamination direction of the laminated steel sheet 11 are provided. The end plate 12 has a plurality of oil holes 32. The plurality of oil holes 32 has projections 32a extending in a radial direction of the end plate 12. A rotor body 1 is formed by assembling the laminated steel plate 11 and the end plate 12. The balance of the rotor body 1 is measured, and according to the result of the balance measurement, the balance is adjusted by cutting the projections 32a formed on the end plate 12.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for adjusting the imbalance of a rotor.

The rotor is formed by fastening a rotating shaft and a laminated steel plate. However, if the center of gravity of the rotor shifts and becomes unbalanced, there are problems that torque transmission abnormality, generation of abnormal noise, and shortening of the air gap that greatly contributes to torque become difficult.

Conventionally, Japanese Patent Application Laid-Open No. 11-299191 is available as a technique in such a field. In the method for adjusting the imbalance of the rotor described in this publication, it is disclosed that the rotor is provided with a protrusion for adjusting the weight and the protrusion at the portion causing the imbalance is cut.

Japanese Unexamined Patent Publication No. 11-299191 JP-A-2018-042426 Japanese Unexamined Patent Publication No. 2012-205402

However, in the conventional method for adjusting the cause of imbalance described above, it is conceivable to adjust the imbalance by using low-rigidity protrusions in order to improve the processing efficiency. There is room for improvement in terms of.

Specifically, Japanese Patent Application Laid-Open No. 2018-042426 describes that the imbalance can be alleviated by laminating laminated steel sheets as a method for correcting the imbalance of the rotor. However, it is difficult to eliminate the imbalance due to the characteristics of laminating steel plates. Furthermore, the state of unbalance after the shaft is fastened ultimately affects the occurrence of torque transmission abnormalities, etc., and correction of the unbalance by rolling laminated steel sheets after assembly including shaft fastening is possible. It is especially difficult.

Further, Japanese Patent Application Laid-Open No. 2012-205402 describes that a member for fastening a laminated steel sheet can be eccentric to eliminate imbalance. However, it is considered difficult to suppress the eccentricity of the core made of the laminated steel sheet because the imbalance varies widely.

In addition, the balance can be adjusted by scraping the end plate with a drill or making a hole. However, since the stainless steel used for the end plate is hard as a material, there is a problem that the blade holding of the drill is poor and the cost increases.

Further, as described in Japanese Patent Application Laid-Open No. 11-299191 described above, it is conceivable that the rotor is provided with protrusions in the axial direction and the protrusions in the axial direction are cut off to adjust the imbalance. However, since the protrusion in the axial direction has a shape that protrudes from the original motor shape, the physique of the motor expands.

The present invention provides a rotor unbalance adjustment method for efficiently performing unbalance adjustment while suppressing the expansion of the physique of the motor.

The rotor unbalance adjusting method according to the present invention is a rotor unbalance adjusting method including a laminated steel plate and an end plate arranged on the end side of the laminated steel plate in the laminating direction, and the end plate is , The plurality of oil holes have protrusions extending in the radial direction of the end plate, and the laminated steel plate and the end plate are assembled to form a rotor body. The balance of the rotor body is measured, and the balance is adjusted by cutting the protrusion formed on the end plate according to the result of the measurement of the balance.
Thereby, the imbalance can be adjusted by cutting off the protrusion formed in the oil hole.

As a result, the imbalance can be efficiently adjusted while suppressing the expansion of the physique of the motor.

It is a figure which shows an example of the structure of a rotor. It is a figure which shows the protrusion of the oil hole of an end plate. It is a top view of the rotor main body which shows the state of measuring the pressure difference between the assembled laminated steel plate and an end plate with a balance measuring instrument. It is a top view which shows the state which operates the rotor main body in the direction of increasing pressure. It is a figure which shows the procedure of an unbalance adjustment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the rotor main body 1 includes a laminated steel plate 11 and an end plate 12. Further, a balance measuring instrument 13 for measuring the balance of the rotor is arranged on the rotor main body 1.

The laminated steel plate 11 is formed by laminating a plurality of flat steel plates. Here, the laminating direction of the laminated steel plate 11 is the Z direction. The directions perpendicular to the Z direction are the X direction and the Y direction. Each of the steel plates forming the laminated steel plate 11 is formed with a hole 21 penetrating in the Z direction at the central portion in the XY direction. Further, the laminated steel plate 11 is formed with a plurality of oil holes continuous in the circumferential direction and penetrating in the Z direction at positions separated from the hole 21 in the radial direction by a predetermined distance.

Further, as shown in FIG. 1, the substantially disk-shaped end plates 12 are arranged above and below the laminated steel plate 11 in the Z direction so as to sandwich the laminated steel plate 11 in the Z direction. A hole 31 penetrating in the Z direction is formed in the central portion of the end plate 12 in the XY direction. Further, the end plate 12 is formed with a plurality of oil holes 32 which are continuous in the circumferential direction and penetrate in the Z direction at positions separated in the radial direction by a predetermined distance from the hole portion 31 formed in the center. ..

When the laminated steel plate 11 and the end plate 12 are assembled, the shaft is inserted into the hole 21 of the laminated steel plate 11 and the hole 31 of the end plate 12. That is, the laminated steel plate 11 and the end plate 12 are assembled so that the positions of the central portions and the oil holes are aligned.

A protrusion 32a projecting in the radial direction is formed on the wall surface forming the oil hole 32. More specifically, as shown in FIG. 2, the protrusion 32a is formed so as to protrude outward in the radial direction from a substantially central position in the circumferential direction on the inner wall surface in the radial direction of one oil hole 32. ..

For example, the shape of the protrusion 32a can be substantially cylindrical. The shape of the protrusion 32a can be freely changed, such as by making the shape of the protrusion 32a conical. The protrusion 32a is formed so as to be removable by a method such as a laser, a press, or a water jet. The method of cutting the protrusion 32a does not matter. For example, the protrusion 32a is formed to have low rigidity, and when the protrusion 32a is cut with a drill, wear of the drill can be suppressed and the blade holding can be improved.

Further, as shown in FIG. 2, the protrusion 32a can freely change the cutting position in the radial direction.

When assembling the laminated steel plate 11 and the end plate 12, the shaft is inserted into the hole 21 of the laminated steel plate 11 and the hole 31 of the end plate 12.

The balance measuring instrument 13 measures the balance of the laminated steel plate 11 and the end plate 12. For example, in the balance measuring instrument 13, measurement is performed with the laminated steel plate 11 and the end plate 12 assembled and the pin, which is a terminal, inserted into the hole 21 and the hole 31. Typically, the balance measuring instrument 13 is a pressure gauge that detects pressure.

As shown in FIG. 3, the balance measuring instrument 13 measures the pressure difference of the rotor main body 1 to specify the position where the imbalance occurs. Further, the balance measuring instrument 13 can identify the position where the unbalance occurs by detecting the phase when the rotor is rotated.

Here, as shown in FIGS. 3 and 4, when the pressure in one direction in the XY direction is large and the pressure in the opposite direction across the center is small, the center position of the rotor body 1 is positioned before the protrusion 32a is cut. Can be moved to adjust the balance. That is, when the unbalanced state is measured by the balance measuring instrument 13, the unbalance is adjusted by excision of the protrusion 32a after the adjustment is performed by a method other than the adjustment of the imbalance by excision of the protrusion 32a. be able to.

Next, the procedure for adjusting the imbalance of the rotor will be described with reference to FIG.

Assemble the rotor body 1 (step S1). At this time, a shaft may be attached to the rotor main body 1, or the shaft may not be assembled. That is, the balance can be adjusted by the following procedure before or after the shaft is fastened.

The balance is measured by the balance measuring instrument 13 (step S2). At this time, it is determined in which direction the adjustment is necessary and the strength of the adjustment is determined. If it is determined that adjustment is necessary (Yes in step S2), the protrusion 32a formed in any of the oil holes 32 is cut, and the cutting position of the protrusion 32a to be cut is determined. The decision is made and the process proceeds to step S3. If it is determined that adjustment is not necessary (No in step S2), the process proceeds to step S4.

Next, unbalance adjustment is performed (step S3). That is, the imbalance is adjusted by cutting the protrusion 32a at the cut position determined in step S2 using the device for cutting the protrusion 32a. After that, the process proceeds to step S4.

When the imbalance adjustment is not necessary or the unbalance adjustment is completed, the process proceeds to the next step (step S4).

If the unbalance adjustment is performed by cutting off the protrusion 32a in step S3, the balance may be remeasured using the balance measuring instrument 13 and further adjusted by returning to step S2.

In this way, the imbalance can be efficiently adjusted by providing the protrusion 32a in the oil hole 32, selecting the protrusion 32a to be cut, and adjusting the cutting position of the protrusion 32a.

More specifically, by lowering the rigidity of the protrusion 32a, it is possible to improve the holding of the drill bit and suppress the occurrence of burrs.

Further, since the position where the protrusion 32a is formed is inside the oil hole 32 and within the physique of the rotor body 1, the physique of the rotor body 1 does not expand. Further, since the protrusion 32a is not shaped so as to protrude in the axial direction (Z direction), the generation of wind noise and the like is suppressed.

Further, the extending direction of the protrusion 32a formed in the oil hole 32 is the radial direction. Therefore, the balance can be adjusted directly in the radial direction by cutting the protrusion 32a. Therefore, the effect of adjustment can be enhanced as compared with the case where the protrusion for cutting is provided so as to project in the axial direction.

Further, by providing the protrusion 32a in the oil hole 32, the man-hours for machining the end plate 12 can be suppressed as compared with the case where the protrusion is provided in another place. Further, when cutting the protrusion 32a with a drill, even if the drill operates so as to penetrate the oil hole 32, the oil hole of the laminated steel plate 11 is at the tip of the oil hole 32 of the end plate 12. Since it is arranged, it is possible to suppress the occurrence of damage to the laminated steel plate 11 which is the core. Therefore, it is possible to improve the yield.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. That is, the above description has been omitted or simplified as appropriate for the sake of clarification of the description, and those skilled in the art can easily change, add, or convert each element of the embodiment within the scope of the present invention. It is possible.

For example, although the rotor has been described above, the target is not limited to the rotor as long as it is desired to avoid eccentricity and imbalance of the shaft. For example, the present invention can be applied to fans, bearings, and the like.

Further, although it has been described that a pressure gauge is used as a balance measuring instrument and the balance is measured using pressure, a method other than pressure may be used. For example, the imbalance of an object can be measured by measuring the displacement with a displacement meter, and the protrusion can be cut and adjusted according to the measurement result.

1 Rotor body 11 Laminated steel plate 12 End plate 13 Balance measuring instrument 21 Hole 31 Hole 32 Oil hole 32a Protrusion

Claims (1)

A method for adjusting the imbalance of a rotor including a laminated steel plate and an end plate arranged on the end side of the laminated steel plate in the laminating direction.
The end plate has a plurality of oil holes and has a plurality of oil holes.
The plurality of oil holes have protrusions extending in the radial direction of the end plate.
The laminated steel plate and the end plate are assembled to form a rotor body.
Measure the balance of the rotor body and
The balance is adjusted by cutting the protrusion formed on the end plate according to the result of the balance measurement.
How to adjust the unbalance of the rotor.

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