JPS6016186B2 - How to balance a rotating body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called balancing method for correcting imbalance during rotation of a rotating body such as a rotor for a rotating electric machine.

A conventional method for balancing a rotating body will be explained with reference to FIGS. 1 to 3, taking an armature of a DC rotating electric machine as an example.

Figure 1 shows the main structure of the armature.

To outline the manufacturing process of this armature, groove insulation 3 is applied to an iron core 2 fixed to a shaft 1, a winding 4 is installed, and a sliding door 5 is formed.
Insert. Next, after the commutator 6 is attached to the shaft 1, the wires are connected 7 and a binding material 8 is applied to prevent the winding 4 from deforming due to centrifugal force, followed by varnish treatment. At this time, due to the bias of the winding 4 and the impregnated varnish, it is not possible to equalize the weight of each part on the same D circle as the shaft 1. In other words, when rotated around axis 1, there is an imbalance in weight, which causes increased vibration. Correcting this imbalance is a balancing process, which requires a process to compensate for excess or deficiency in the weight of each part. As shown in Fig. 2, the conventional method is to insert a coil 5 onto the winding 4.
There is a method in which a small piece 9 of a predetermined weight is driven into the top of the shaft 1, or a screw hole 11 is created in advance in the ring 10 attached to the shaft 1 as shown in Fig. 3, and a screw 12 is attached thereto. Imbalances are corrected through methods such as scraping. In this process, an unbalanced portion is detected while rotating the armature using a balancing device, and a predetermined weight is reduced or added. However, with such a balancing means, when driving the small piece 9, there is a risk of damaging the wire 5 and the winding 4, and it is necessary to take measures to prevent the varnish from entering the screw hole 12, resulting in poor workability. The disadvantage is that many small pieces and screws of different weights must be prepared because the required weights vary. The present invention has been made in view of the above points, and it is an object of the present invention to provide a method that is easy to work with, can easily obtain the required weight, and can ensure balance.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6.

First, an inorganic filler is mixed into a synthetic resin to form a clay-like substance (
(hereinafter referred to as putty). When this putty is irradiated with ultraviolet rays, it hardens to a predetermined hardness in one second to obtain the predetermined adhesive force, and when heated, it hardens to the predetermined hardness in several hours to obtain the predetermined adhesive force. put. Typical compositions and formulations of this putty are shown in Tables 1 and 2 below. Table 1: Composition and formulation of Putty A Table 2: Composition and formulation of Putty B Figure 5 shows the relationship between the degree of hardening of the putty (as indicated by the Barcol hardness meter) and the ultraviolet irradiation time, and shows the measurement conditions. is as follows.

Specimen: As shown in FIG. 4, putty was deposited on the coil end of the armature to a thickness of about 2 fences, and ultraviolet rays were irradiated.

The irradiation time was changed to 5, 10, 20, and 3 times. Further, ultraviolet irradiation was performed at a distance of 5 degrees below an ultra-high pressure mercury lamp with an output of W. ■Measurement method: ASTM-D
Based on 2583, Barcol hardness tester (GYZJ934-
1, hardness 80), and the dial indication value (average of 5 times) of the hardness meter was determined for the hardened putty (1-).

Further, FIG. 6 is a diagram showing the effect of heat treatment on the degree of hardening of the putty (as indicated by a Barcol hardness meter) when the inside is uncured, and the measurement conditions are as follows.

Measurement condition '1) Sample: Under measurement condition '1'' in FIG. 5, a sample under ultraviolet irradiation time of 5 seconds was used as the target sample.

(In other words, the surface layer of the putty is hardened, but the inside is unhardened).
, 3 and 4 hours, respectively. [21 Measurement method: The heat-treated sample of '1) was left to cool to room temperature, and then
The degree of hardening was determined in the same manner as measurement condition '2' in the figure. Then, weigh the wire 13 having the above-mentioned properties by a weight corresponding to the unbalanced portion, and place it tightly on any part of the armature (in this example, on the winding 4) as shown in Fig. 4. let

Next, the entire surface of this putty 13 is irradiated with ultraviolet rays 15 generated by an ultraviolet generator 14 for several seconds to harden the putty 13 to a predetermined hardness (for example, using putty B shown in Table 2,
Under the same conditions as shown in FIG. 5, irradiation with ultraviolet rays gives a hardening degree of about 50 on the Barcol hardness tester, and the material is bonded onto the winding 4 of the armature.

At this time, when the putty 13 is attached to a plurality of parts, the armature is rotated gently so that the putty 13 is uniformly irradiated with the ultraviolet rays 15.

Then rotate the armature and check for any other imbalances.

In this step, as shown in FIG. 5, the putty 13 has a composition that hardens in 1 minute of irradiation time with the ultraviolet rays 15, so it does not peel off due to centrifugal force, and the putty 13 does not peel off due to centrifugal force. It can be implemented immediately. Next, ultraviolet 15
However, there may be some parts that do not penetrate this putty 13 and are insufficiently hardened, so after completely balancing the armature with putty 13, this putty 13 is heated to a predetermined hardness over several hours (for example, after hardening). When putty B shown in Table 2 is used and the conditions are the same as shown in FIG. 6, the degree of hardening is improved by heating for 2 hours (the degree of hardening is approximately 65 on the Barcol hardness scale).

In this case, the putty 13 on the surface layer is hardened, and the flow of the unhardened putty 13 inside is completely blocked, so this putty 13 may flow or deform during heat curing. Not at all. By doing as described above, the putty 13 that can withstand the temperature and centrifugal force during operation can be adhered onto the winding 4, and an armature that rotates uniformly can be obtained. Although this embodiment describes the case of the armature of a DC rotating electrical machine, it goes without saying that it can also be applied to balancing other rotating bodies such as the rotor of an AC rotating electrical machine. It can also be applied to repair leaks or to bond or repair parts that cannot be easily heated, such as equipment installed underwater.

As described above, according to the present invention, a viscous material that is cured by ultraviolet light and has adhesive strength is used to balance the rotating body, so the work is simple, and the required weight can be easily obtained and ensured. Balance can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of main parts of an armature of a DC rotating electric machine, Figs. 2 and 3 are partial views showing an example of a conventional balancing method, and Fig. 4 is for explaining a balancing method according to the present invention. Figure 6 is a diagram showing the relationship between the degree of hardening of the clay-like material used in the present invention and the ultraviolet irradiation time, and Figure 6 shows that the inside of the clay-like material used in the present invention is uncured. FIG. 3 is a diagram showing the effect of heat treatment on the degree of hardening of this clay-like material in the case of FIG. Note that the same reference numerals in the drawings indicate the same or corresponding parts, 4 is a winding, 13 is a clay-like material that hardens with ultraviolet light, and 15 is ultraviolet light. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. Balancing of a rotating body, characterized in that the rotating body is balanced by bringing a clay-like substance that hardens with ultraviolet rays into close contact with any part of the rotating body, and bonding it by irradiating it with ultraviolet rays. How to take it. 2. A method for balancing a rotating body according to claim 1, characterized in that ultraviolet rays are irradiated while rotating the rotating body. 3. A method for balancing a rotating body according to claim 1 or 2, wherein the rotating body is a rotor for a rotating electric machine.