JPS60216751A - Correcting method for unbalance of rotor - Google Patents

Abstract

PURPOSE:To readily automate the correcting work of an unbalance of a rotor by press-fitting two main and sub balance plates of the same shape into a shaft of the rotor under special conditions. CONSTITUTION:A rotor A of a motor is composed of a shaft 1, a commutator 2, a core 3 and a winding 4. In order to correct the unbalance of the rotor A, a set of two main metal balance plates 5 of the same shape, and a sub balance plate 6 extremely reduced in the thickness are employed. The plates 5 are formed of a semicircular unit having a long radius with an axial hole at the center and a semicircular unit having a short radius in an asymmetrical shape. Thus, in the correcting work, the central line of the superposing angle alpha of the plates 5 is brought in coincidence with the composite vector direction of the unbalance of the rotor A, and the plates 5 are press-fitted to the shaft 1 at the angular position where the composite vector direction is displaced at 180 deg.C. Then, the remaining unbalance is corrected by the sub plate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for correcting unbalance of a rotor of a rotating electric machine such as a motor or a generator.

If the rotor of the rotating electric machine is an annular lance, vibration will occur, causing noise, and the bearings and brushes will wear heavily, reducing durability. The child imbalance must be corrected.

Conventionally, methods for correcting the unbalance of the rotor include a method of detecting the direction of the unbalance of the rotor using a balancing machine and gluing putty on the surface of the winding portion, and a method of cutting the outer periphery of the core. Applied.

However, with the former method, it is difficult to quantify the putty;
Also, since the surface of the winding part to which the putty is glued is constant and strong,
It can only be done manually, is difficult to automate, and has drawbacks such as the need to dry the putty. On the other hand, in the latter method, the cutting range of the core is limited, so there is a limit to the correction ability, and since the outer periphery of the core is cut, the amount of magnetic flux decreases, resulting in a decrease in motor performance. There are disadvantages such as debris falling into the gaps between the windings.

This invention was made in order to solve the above problems, and the unbalance can be easily corrected regardless of the rotor core shape and the size of the unbalance, and chips are not generated due to core cutting. The main object of the present invention is to provide a rotor unbalance correction method that does not cause a decrease in motor performance and can easily automate the correction work.

A further object of the present invention is to provide a rotor unbalance correction method that allows residual unbalance to be easily corrected after the unbalance correction work is completed.

The rotor unbalance correction method according to the present invention can be mounted on the shaft of the rotor in an overlapping manner, have a center of gravity at a portion off the axis, and can be divided into at least two groups of the same number. A plurality of main balance plates of the same shape, -
Using one or more sub-balance plates that are thinner than the main balance plate of the set, the balance soil of the two sets is determined according to the balance amount obtained by measuring the unbalance of the rotor. The overlapping angle of the plates is determined, and the unbalance resultant vector direction obtained by the rotor unbalance measurement is shifted by 180 degrees from the center of the overlapping angle of the two sets of balance main plates. After fixing the two sets of balance main plates to the shaft and performing the first unbalance correction work, and then measuring the residual unbalance of the rotor, perform the same procedure as the first unbalance correction work. Alternatively, the secondary balance plate is fixed to the shaft to perform the second unbalance correction work.

Hereinafter, this invention will be specifically explained based on drawings showing various types of flow sides.

In Figures 1 to 4, (8) is the rotor of the motor, (1) is the shaft, (2) is the commutator, (3) is the core,
(4) is a winding.

(6) In order to correct the unbalance of the rotor, the shaft (
1) is a set of two metal main balance plates of the same shape that are press-fitted and fixed, and (6) is a sub-balance plate whose plate thickness is extremely thin.

In the illustrated example, the balance main plate (5) has a thickness (
1), a half interior (5b) with a long radius (rl) and a half interior (5C) with a short radius (r2) with a shaft hole (5a) in the center.
It is formed in an asymmetrical shape with the center of gravity shifted from the center of the shaft hole.

The main balance plate (5) (5) is used for the primary unbalance correction work of the rotor, and also used as the secondary balance plate (6).
is used for the second unbalance correction work.

To perform the primary unbalance correction work of the rotor (8) using the same-shaped balance main plate (5) (5),
First, the rotor is placed on a well-known balancing machine.
The amount of unbalance and the direction of the resultant vector of the anno (lance) are measured.

In the conventional putty correction method, a putty of the same amount as the measured unbalance is added at a position 180 degrees away from the direction of the resultant vector of the measured unbalance. The unbalanced amount is removed in the same direction as the vector direction of the rotor, and the lance of the rotor is corrected.

In contrast, this invention corrects unbalance by press-fitting and fixing the two same-shaped balance main plates (5) ff+) to the rotor shaft under the following condition. It is.

That is, as shown in Fig. 3, the balance main plate (5
) The center line (X-X) of the overlapping angle (b) in (5) is the base line, and this center * (X-X) is aligned with the direction of the resultant vector of the rotor unbalance described above, At an angular position where the resultant direction of the unbalance of the rotor and the resultant vector direction of the balance main plate (5) are shifted by 180 degrees, the double plate +5) (5) is press-fitted onto the shaft (1) and fixed.

The main plate body may be fixed to the shaft by caulking, adhesion, welding, screw tightening, or the like.

The overlapping angle of the main balance plate (5) (5) (
(b) The amount of unbalance measured with a conventionally known balancing machine is measured by the balance main plate used (
Based on the overlapping angle (b) in 5), it is calculated from the following equation, which is determined by vector calculation.

w=, ρt(rt3-y23)sing＼, W:
Amount of unbalance ρ: Specific gravity of the balance plate material rl: Radius of the large half inside of the main balance plate r2: Radius α of the small half inside of the main balance plate: Overlapping angle of the two main balance plates t: Thickness of the balance plate Thus, by the above-described first unbalance correction work, most of the unbalance of the rotor is corrected.

What is shown in FIGS. 5 to 6 and 7 to 8 is as follows.
Another embodiment of the balance main plate used in the balance correction method of the present invention, in which two balance plates (5) are used.
Among (5), a large number of recesses (5d) arranged in the circumferential direction are provided on the outer peripheral part or the inner peripheral part of one plate,
The other plate is provided with convex portions (5e) that are fitted into the four portions, and by fitting the concave and convex portions, it is possible to securely hold the stacked bipolar plates.

What is shown in Figures 9 and 10 is a balance plate (5
) is another embodiment of the synthetic resin circular substrate (5f
) has a shaft hole (5a) in the center, and a sector-shaped weight plate (5g) made of metal with a higher specific gravity than the substrate is fitted into the eccentric part.

Moreover, in the one shown in FIGS. 11 and 12, the main balance plate (5) made of metal is rectangular, and a shaft hole (5a) is provided at one end thereof.

Furthermore, in the one shown in FIGS. 13 to 14, the main balance plate (5) made of metal is disk-shaped, and the shaft hole (5a) is provided at a portion offset from the center. It is.

The balance main plate (6) (5) is connected to the rotor shaft (1).
), for example, the means shown in FIGS. 15 to 16
As shown in the figure, a tapered part (1a) is provided on the 11th axis (1), and the main plate (5) (F,) is temporarily press-fitted into this tapered part, allowing fine adjustment in the direction of rotation. Then, measure the unbalance of the rotor again, and if an unbalance occurs, turn the main plate (5) to the optimal angular position to eliminate the unbalance. There is also a two-step press-fitting means that adjusts and further press-fits and fixes at that angle. According to this press-fitting means, the accuracy of unbalance correction by the unbalance main plate (5) (5) is improved.

In addition, as a two-step press-fitting means, as shown in FIGS. 17 to 18, a stepped portion (1b) is provided in the fill (1), and the main plate (5) (5) is stepped in the same manner as described above. Attached part (
After temporarily press-fitting into 1b), measure the unbalance again.
There is also a method of adjusting the angle of the plate and then press-fitting it further to fix it.

As mentioned above, the unbalance of the rotor can be corrected by press-fitting and fixing the two unbalance main plates to the rotor shaft at the required angle, but after press-fitting and fixing the two main plates, a slight unbalance can be fixed. In some cases, this residual imbalance may be corrected as follows.

In order to correct the residual unbalance, as shown in FIGS. 1 and 1A, the secondary unbalance plate (6) is made extremely thinner than the main balance plate (5).
) is used.

That is, the rotor, whose unbalance has been corrected using the main plate (5), is set on the balancing machine again, and the amount of residual unbalance and the direction of the unbalance resultant vector are measured, as shown in Fig. 19. , when the main plate is press-fitted and fixed, an unbalanced lid named Pl is generated. If a vector named P2, which is equal in magnitude to P2, is formed in the opposite direction to this vector (direction shifted by 180 degrees), then
Since the resultant vector is zero, press-fit and fix the center of gravity (G) of the ultra-thin sub-plate (6) to the shaft (1) at an angular position 180 degrees off from the direction of the unbalanced vector P1. . In that case, Pl is too thick, and with one sub-plate, P,
If =P2 is not achieved, adjust by stacking 2 and 6 sheets.

What is shown in FIG. 20 is another embodiment of the balance plate. In this embodiment, a plurality of balance plates (6a, 6b, 6c) having the same thickness as the sub-balance plate (6) are used.
, 6d, 6e) are stacked to form the balance main plate (
5), and in this example, the plates (6a), (6b), (6d), and (6e) are treated as the main balance plates, and the i ! +! By press-fitting and fixing to II (1), unbalance can be corrected.

Thus, according to the rotor unbalance correction method described above, all the problems of the conventional unbalance correction method, which involves gluing putty to the winding surface and cutting the outer periphery of the core, can be solved. Excellent effects can be obtained.

(1) In the conventional repair method of cutting the outer periphery of the rotor core, the correction ability is limited by the shape of the core and the size of the unbalance. You can correct the agitation balance without any problems.

＼ (2) According to the above correction method, cutting waste is not generated due to core cutting, so if cutting waste enters the winding,
Since the amount of magnetic flux is not reduced by cutting the outer periphery of the core, there is no risk of deterioration in motor performance after modification.

(3) In the conventional repair method of gluing putty to the surface of the winding, it is difficult to quantify the amount of putty, the surface of the winding to which the putty is adhered is not constant, and the putty must be dried. However, according to the unbalance correction method described above, the balance correction processing work can be easily automated.

(4) According to the rotor unbalance correcting method using a main balance plate and a sub-balance plate whose plate thickness is reduced, the amount of rotor unbalance can be suppressed to a minimum. , accuracy can be improved. Moreover, from this, it is possible to manufacture a highly efficient motor with less noise.

(5) According to the balance correction method described above, the unbalance plate fitted and fixed to the shaft of the rotor can also serve as a thrust receiver.

(6) According to the method of correcting the unbalance of the rotor by press-fitting and fixing the main balance plate and the sub-balance plate to the shaft, it is possible to automate all the work processes.

As described above, according to the present invention, the rotor can be mounted on the shaft of the rotor in an overlapping manner, the center of gravity is located off the axis of the rotor, and the distribution is made into at least two equal groups. By using a plurality of main balance plates of the same shape and one or more sub-balance plates that are thinner than the main balance plates of the set, it is possible to obtain results by measuring rotor imbalance. The overlapping angle of the two sets of balance main plates is determined according to the balance amount obtained, and the unbalance resultant vector direction obtained by the rotor unbalance measurement and the two sets of balance main plates are determined. The two sets of main balance plates were fixed to the shaft at an angular position 180 degrees shifted from the center of the overlapping angle of After that, perform the lance correction work in the second water annulation by fixing the secondary plate for the lance to the shaft using the same procedure as the first annulation (lance correction work). Compared to conventional unbalance correction methods that involve cutting wires attached to the winding surface or cutting the outer periphery of the core, there is no limit to the correction ability, and there is no risk of degrading motor performance. It is possible to obtain a method for correcting unbalance that can be suppressed to a minimum, and can greatly contribute to the automation of the unbalance correction work process.

[Brief explanation of the drawing]

FIG. 1 is a side view of a rotor of a motor showing an embodiment of the present invention, FIG. 1A is an exploded perspective view of a main balance plate and a sub-plate, and FIG. 2 is a front view of the main balance plate. FIG. 3 is a front view of the overlapping balance main plates, FIG. 4 is a side view, FIG. 5 is a front view of the balance main plate used in another embodiment, and FIG. 6 is a longitudinal sectional view. Fig. 7 is a front view of the main balance plate used in another embodiment, - Fig. 8 is a vertical sectional view, Fig. 9 is a front view of the main balance plate used in another embodiment, and Fig. 10. is a longitudinal sectional view, FIG. 11 is a front view of the balance main plate showing another embodiment, and FIG. 12 is a side view.
Fig. 13 is a front view of the balance main plate showing another embodiment, Fig. 14 is a side view, and Figs. A partially cutaway side view, FIGS. 19 to 19 are vector diagrams of a secondary balance plate, and FIG. 20 is a side view of a combined plate portion of a main balance plate and a secondary plate according to another embodiment. (1) °°・rotor axis, (2)... commutator, (3
)...core, (4)...winding, (5)...main plate for balance, (5a)...shaft hole, (5b) (5c)
---Semicircular part, (5d) ... Concave part, (5e)
- Convex portion, (5f)... circular base plate, (5g)... weight plate, (6)... (sub plate for lance. Figure 1Δ Figure 1A Figure 3 Figure 2 × Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18

Claims (7)

[Claims] (1) A plurality of main balance plates of the same shape that can be attached to the rotor shaft in an overlapping manner, have a center of gravity at a location off the axis, and can be divided into at least two groups of the same number. and one or more sub-balance plates that are thinner than the main balance plate of the set,
Determining the overlapping angle of the two sets of balance main plate bodies according to the amount of balance obtained by measuring the unbalance of the rotor, and determining the direction of the resultant vector of the unbalance obtained by measuring the unbalance of the rotor, The first unbalance correction work is performed by fixing the two sets of main balance plates to the shaft at an angular position that is 180 degrees shifted from the center of the overlapping angle of the two sets of main balance plates, and then the rotor After measuring the residual unbalance, perform the 7'% y72 correction work on the □O centering on the □1iill board, using the same procedure as the first unbalance correction work. Features a rotor unbalance correction method. (2) The main balance plate and the sub-balance plate include a plate consisting of a long-radius half-interior with a shaft hole in the center and a short-radius half-interior. How to correct rotor imbalance. (3) A balance main plate which is provided with a concave portion on one side and a convex portion on the other side of the overlapping main balance plates, and the overlapping main balance plates are fixedly held by fitting the concave and convex portions. A rotor unbalance correction method according to claim 2, which uses a rotor body. (4) The main balance plate body is composed of a synthetic resin circular substrate having a center (support) shaft hole, and a metal fan-shaped heavy frog plate embedded in a part eccentric from the axis. 2. A rotor unbalance correction method according to claim 1, which uses a plate body. (5) The rotor unbalance correcting method according to claim 1, wherein the main balance plate is a rectangular plate having a shaft hole at one end. (6) The rotor unbalance correcting method according to claim 1, wherein the main balance plate is a circular plate having a shaft hole at an eccentric portion. (7) Provide a tapered part of the shaft of the rotor with a stepped part, and after fitting the balance main plate into this part, measure the rotor unbalance again, and adjust the main plate in the rotational direction based on that. 2. A rotor unbalance correcting method according to claim 1, wherein the rotor is rotated to perform fine adjustment, and then press-fitted into a predetermined shaft portion at that angle and fixed.