JPH04190662A - Method of correcting unbalance of rotor - Google Patents

Abstract

PURPOSE:To reduce the vibration in the rotating condition of a rotor, and decrease the dispersion of the vibration in the same quantity of unbalance by putting the phases of the quantities of residual unbalance on the two independent planes perpendicular to the axis in and around 180 deg. (reverse phase). CONSTITUTION:The quantities of the dynamic unbalance in rotation of a rotor 1 is measured as the quantities of moment of mara and mbrb, at dynamic unbalance modification faces 7a and 7b. According to the quantities ma and mb of unbalance, by the cutting of an iron core or a balance pate, the quantities of unbalance are modified. And after modification of the dynamic unbalance, on a static unbalance modification face 9, the quantity mc of static unbalance is measured, and modification is performed similar to the dynamic unbalance modification method. By this static unbalance modification, the phases of the quantities of residual unbalance at the dynamic unbalance modification faces becomes the distribution centering on 180 deg. (reverse phase). That is, it can be made the motor with low vibration and small vibratory dispersion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for correcting an unbalance in a rotating body such as a commutator motor used in a vacuum cleaner.

Conventional Technology In recent years, the competition for higher output and lower noise in household vacuum cleaners has become increasingly intense, and there has been a demand for high-speed, low-vibration motors for commutator motors, which are key components. Therefore, there has been a demand for a method of correcting the unbalance of a rotating body that is more accurate and effective for the vibration of an electric motor, especially in order to reduce vibration.

Hereinafter, a conventional method for correcting an unbalance amount will be described with reference to the drawings.

FIG. 4 is a partial sectional view showing the external appearance of the rotating body according to the conventional correction method, and FIG. 5 is a model diagram showing the position of correcting the unbalance of the rotating body in FIG. 4. Moreover, FIG. 6 is a perspective view showing the phase relationship of the residual unbalance amount after the unbalance correction.

In FIG. 4, 1 is a rotating body, 2 is an iron core made of laminated iron plates having a plurality of slots on the outer periphery, 3 is a rotating shaft that is press-fitted into the iron core 2 and rotates together with the iron core 2, and 4 is the rotating shaft 2.
a commutator, 6, which is press-fitted and fixed to the
is a bearing that supports the rotating shaft 3. In Figure 5, 1,
2.3.6 shows the modeled rotating body, core, shaft, and bearing, respectively.

Conventionally, the method of measuring the amount of unbalance of a rotating body as shown in Fig. 5 is to use the laminated thickness Ω of the iron core 2 and the radius r, and when Ωter: dynamic balance Ω - When: Static balance is used, but with the exception of a unique motor (flat motor), as shown in Figure 4, for boat fishing, it is a Ω motor. Therefore, measurement and correction using dynamic balancing methods have become mainstream. In addition, as a method of dynamic balance, the amount of dynamic hooking while the rotating body is rotating is measured on two independent planes that face each other across the center of gravity of the rotating body and are orthogonal to the axis of rotation.・This is a method of correction. That is,
In the rotating body 1 shown in FIG. 5, the two dynamic small hook engagement correction surfaces are set to both end surfaces 7a and 7b of the iron core 2, and the dynamic small hook engagement amount of the entire rotating body l is adjusted to the dynamic small hook engagement amount. alignment correction surface 7a, ?
Separate on b, unbalance amount mar *, mb
It is measured as the amount of moment of r b.

Then, the amount of unbalance ma and mbl on the dynamic small hook correction surface 7a and Tb are generally r, = rb = r (= core diameter)
In many cases, the amount of unbalance can be regarded as m 2 rmb. ), the amount of unbalance was corrected by cutting the core 2 or applying balance putty.

Problems that the invention aims to solve However, in the method described above, the correction surface 6a.

Since 6b is an independent surface, the phase of the residual unbalance m=', mb' (θ in Fig. 6) after correction is 0.
The angles will exist randomly from 0° to 360°.

Here, the relationship between the phases of the residual unbalance amounts ml' and m2' and the vibration μ in the rotating state of the rotating body is that the vibration μ changes with the phase θ as shown in FIG.
” (in-phase), the vibration μ is large and 180° (
When the phase is near (opposite phase), the vibration μ becomes small. In other words, even if the unbalance amounts ma' and mb' are reduced,
If the phases are in the same phase, the vibration will become thicker.On the other hand, the method of changing the phase to the opposite phase when correcting the amount of unbalance is difficult to automate, and the amount of core cut is It had the disadvantage of being too large.

In view of the above-mentioned problems, the present invention provides a method for correcting the amount of unbalance of a rotating body, which can reduce vibrations of a motor using a relatively easy method.

Means for Solving the Problems In order to solve the above problems, the correction method of the present invention is such that the dynamic small hooking amount of the rotating body is located on both sides of the center of gravity of the rotating body in the axial direction and perpendicular to the rotation axis. In addition to correcting the two independent dynamic hooks, the static imbalance of the rotating body is corrected on the static unbalance correction plane narrowed above and located at or near the center of gravity of the rotating body and perpendicular to the axis of rotation. The feature is that the balance amount is also corrected.

Effect The present invention uses the method described above to change the phase of the residual unbalance on two planes perpendicular to independent axes to 180' (
Since the rotation state of the rotating body can be made near (inverse phase), vibrations in the rotating state of the rotating body can be reduced. Furthermore, the variation in vibration for the same amount of unbalance can also be reduced.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view showing the appearance of a rotating body according to the correction method of the present invention, and FIG. 2 is a model diagram showing the position of the unbalance correction surface of the rotating body in FIG. FIG. 3 is a graph showing the phase distribution of residual unbalance after correction by the correction method of the present invention. In FIGS. 1 and 2, 1 is a rotating body, 2 is an iron core, 3 is a rotating shaft, 4 is a commutator, 5 is a winding, and 6 is a bearing, which are the same as in the conventional example.

7a and 7b are correction surfaces located independently on both sides of the center of gravity 8 of the rotating body 1 in the axial direction to measure and correct the amount of dynamic small hook engagement; 9 is located at or near the center of gravity of the rotating body; This is a correction plane perpendicular to the rotation axis 3 that measures and corrects the amount of static unbalance. Also, rTla.

mb2mc is the amount of unbalance on the correction surfaces 7a, 7b, and 9, respectively.

Next, the correction order will be explained.

First, the amount of dynamic hand balance during the rotation of the rotary body 1 is determined by mar on the dynamic hand balance correction surfaces 7a and 7b.
It is measured as the amount of moment a r mt + r b. Then, the unbalance amounts ma and mb on the dynamic hand balance correction surfaces 7a and 7b (generally j, = rb = r
(iron core diameter) (, unbalance amount is rn
It can be considered as a * rll b. ), the amount of unbalance is corrected by cutting the core 2 or applying balance putty. After the dynamic hand balance correction, the static hand balance amount me is measured on the static hand balance correction surface 9, and the unbalance is corrected by cutting and balance putty in the same way as in the dynamic hand balance correction method. . Due to the above-mentioned static hand balance correction, the phase of the residual unbalance amount on the dynamic hand balance correction surface becomes 1 as shown in Fig. 3.
The distribution is centered around 80° (reverse phase). In other words, as can be seen from the relationship between the phase θ and the vibration value μ in FIG. 4, the rotating body can achieve a motor with low vibration and small vibration variation.

Effects of the Invention As described above, the present invention adjusts the amount of dynamic hand balance in a rotating body on two independent dynamic hand balance correction surfaces perpendicular to the rotation axis located on both sides in the axial direction with respect to the center of gravity of the rotating body. At the same time, by correcting the amount of static hand balance of the rotating body on a static hand balance correction plane perpendicular to the axis that is narrowed between the both end faces and located at or near the center of gravity of the rotating body, The rotating body can be made to have a distribution in which the phase of the residual unbalance amount on the dynamic hand balance correction surface is centered at 18 degrees, and a motor with low vibration and small vibration variation can be made.

In addition, compared to conventional correction methods, the dynamic hand balance correction surface has a static hand balance correction surface at the appropriate position, so corrections are not only easier, but also extremely useful for automation. becomes.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional external view showing the appearance of the rotating body according to the correction method of the present invention, FIG. 2 is a model diagram showing the position of the unbalance correction surface of the rotating body in FIG. 1, and FIG. 3 is the present invention. A graph showing the phase distribution of residual unbalance after correction by the correction method, Fig. 4 is a partial cross-sectional external view showing the appearance of the rotating body by the conventional correction method, and Fig. 5 shows the rotation body in Fig. 4. Fig. 6 is a perspective view showing the phase relationship of the residual unbalance amount after the unbalance correction, and Fig. 7 shows the relationship between the phase of the residual unbalance amount and the vibration of the rotating body. This is a graph representing 1... Rotating body, 3... Rotating shaft, 7a,
7b...Dynamic hand balance correction surface, 8...
- Center of gravity, 9... Static hand balance correction surface. Name of agent: Patent attorney Haruaki Ogata and 2 others Fig. 2 Fig. 3 [4 bites 9 go 5, amount ma, mb, I stand o eyes] Fig. 5 Fig. 6 b [Rotating book + ti Kai i: Mel〕 S Fan

Claims (1)

[Claims] In correcting the unbalance of a rotating body, the amount of unbalance of the rotating body is corrected on two planes that face each other with the center of gravity in between. An unbalance correction method for a rotating body that corrects the amount of static unbalance of the rotating body on a static unbalance correction plane perpendicular to .