JP2013029464A - Balance correction method of rotor and correction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that enables the imbalance of a rotor to be corrected without both adding of a weight to the surface of the rotor and excising of a portion of the rotor.SOLUTION: The present invention is a balance correction method in which a prescribed balance weight is fixed on a rotation axis of a rotor. When the balance weight is fixed on the rotation axis, any one of balance weights suitable for the correction amount of balance to be corrected is selected among multiple kinds of the balance weights corresponding to the different correction amount of balance from each other, and is press-fitted and fixed into a groove provided on the rotation axis of the rotor. Alternatively, a balance weight is formed such that the center of gravity thereof is made eccentric up to the position in accordance with the correction amount of balance to be corrected, and is press-fitted.

Description

  The present invention relates to a method and apparatus for correcting imbalance of a rotating body.

Conventionally, as a method of correcting the imbalance of the rotating body, based on the measurement result, a correction method by adding weights such as pins and putty having a predetermined weight to a predetermined position of the rotating body, There has been a correction method for excising a predetermined portion by a predetermined amount.
The inventor of the present application proposed a putty supply device that can be used in the former correction method in Patent Document 1.
The technique described in Patent Document 1 is an apparatus that can add a viscous material such as a putty added in correcting the unbalance of the rotating body to the side surface of the rotating body by ejecting the viscous material by an accurate volume.

JP 5-296868

However, in the method of adding weights such as pins and putty, there is a risk of peeling when the rotating body rotates at a high speed. Furthermore, it is necessary to prepare weights of a plurality of types according to the unbalance amount to be corrected.
Further, in the method of excising a part of the rotating body, there is a problem that if a part of the rotor of the motor or the generator is excised, the magnetic characteristics and the like are deviated from the intended characteristics.
Therefore, an object of the present invention is to provide a technique that makes it possible to correct the unbalance of the rotating body without adding a weight to the surface of the rotating body and without removing a part of the rotating body. It is said.

The invention according to claim 1 of the present invention includes:
A balance correction method for fixing a predetermined balance weight to a rotating shaft of a rotating body,
When fixing the balance weight to the rotating shaft,
One of the balance weights suitable for the balance correction amount to be corrected is selected from a plurality of types of balance weights corresponding to different balance correction amounts, and is fixed to the rotating shaft of the rotating body. This is a balance correction method.
In claim 2,
A balance correction method for fixing a predetermined balance weight to a rotating shaft of a rotating body,
When fixing the balance weight to the rotating shaft,
The distance from the axis of the rotating shaft to the center of gravity of the balance weight is fixed according to the distance corresponding to the balance correction amount to be corrected.
The balance weight structure may be, for example, a U-ring shape, a C-ring shape, or an E-ring shape.
In claim 3,
When providing the balance weight with a press-fitting hole for press-fitting into the rotating shaft,
The press-fitting hole is provided at a position eccentric from the center of gravity of the balance weight according to the balance correction amount to be corrected.
In claim 4,
When fixing the balance weight to the rotating shaft,
The balance weight is press-fitted into a groove provided on the rotating shaft.
The balance correction apparatus according to claim 5 is:
In a balance correction device that performs a balance correction by adding a predetermined balance weight according to the balance correction amount of the rotating body measured in advance,
Rotating body setting means for setting and holding the rotating body at a predetermined position;
Supply means for sequentially supplying balance weights for press-fitting into the rotating shaft of the rotating body set by the rotating body setting means to perform balance correction;
The balance weight is received from the supply means according to the measured balance correction amount to be corrected, and is press-fitted into the right rotation axis and the left rotation axis of the rotation body set in the rotation body setting means, respectively. Press-fitting means,
It has.
In claim 6,
The press-fitting unit selects and press-fits one of a plurality of types of balance weights supplied by the supply unit based on a balance correction amount to be corrected.
In claim 7,
The press-fitting means press-fits the center of gravity of the balance weight eccentrically at a position corresponding to the balance correction amount to be corrected.

According to the present invention,
When fixing a predetermined balance weight to the rotating shaft of the rotating body,
Since the distance from the axis of the rotating shaft to the center of gravity of the balance weight is fixed in accordance with the distance according to the balance measurement result, compared to the conventional method of excising a part of the rotating body, the magnetic property is improved. The influence can be eliminated.
In addition, even with one predetermined type of balance weight, by changing the distance from the axis of the rotating shaft to the center of gravity of the balance weight, it is possible to cope with some amount of unbalance that can be corrected. There is no need to keep weights aligned.
In addition, since the distance can be set to a desired distance, not a discrete distance, a precise balance correction according to the measurement result is possible.

It is a side view of the rotary body (rotor) made into object by the balance correction method of this invention. It is a top view of the balance weight used with the balance correction method of this invention. It is explanatory drawing of the depth which fits a balance weight. It is a top view of the balance weight which provided the recessed part in the notch | incision. It is an illustration of other shapes of balance weight. 6 is a plan view of a balance weight of Example 2. FIG. It is explanatory drawing of the balance weight which partly excised. It is a front view of the Example of the balance correction apparatus concerning this invention. It is a right view of a part of an embodiment of the balance correction device. It is a left view of a part of an embodiment of the balance correction device.

EMBODIMENT OF THE INVENTION Below, the form for implementing the balance correction method of the rotary body concerning this invention is demonstrated with reference to drawings.
FIG. 1 is a side view of a rotor of a motor as an example of a rotating body whose balance is to be corrected.

  The rotor 1 shown in FIG. 1 includes a rotating shaft 2, a coil, and a commutator. Shallow grooves 21 and 21 along the circumference are formed at two locations on the rotary shaft 2.

The balance weight 3 of the first embodiment shown in FIG. 2 is for correcting the balance of the rotor 1 by being fitted into the groove 21 and fixed. 2A is a plan view of the balance weight 3, and FIG. 2B is a side view of the balance weight 3.
The balance weight 3 is a disk-shaped metallic member having a U-shaped notch 31 formed on one side, and the width D2 of the notch 31 is slightly narrower than the outer diameter D1 of the groove 21. (D2 <D1). The thickness T2 in the vicinity of the notch 31 is slightly thicker than the width T1 of the groove 21 (T2> T1).
Thus, when the balance weight 3 is fitted into the groove 21 of the rotating shaft 2, the notch 31 of the balance weight 3 is slightly elastically deformed and spreads and fits into the groove 21, and then the cut. The balance weight 3 is firmly fixed to the rotating shaft 2 by sandwiching the outer periphery of the groove 21 by the elastic restoring force of the notch 31. In addition, when the vicinity of the notch 31 is sandwiched between the side walls of the groove 21, the balance weight 3 is more firmly fixed.
As described above, when the balance weight is fixed to the rotation shaft, the fixing work is provided by the fitting structure such as the groove 21 so that the fixing position is maintained. The fixed position can be prevented from shifting.

  At this time, as the balance weight 3, a plurality of types of balance weights corresponding to, for example, three types of balance correction amounts are prepared, and a balance weight suitable for the balance correction amount to be corrected is selected and press-fitted onto the rotary shaft. can do.

Alternatively, as shown in FIG. 3A, when the balance weight 3 is inserted deeply into the notch 31, the center of gravity of the balance weight 3 approaches the axis of the rotary shaft 2, so that the balance is corrected. The amount is reduced, and as shown in FIG. 3B, when the balance weight 3 is fitted at a shallow position of the notch 31, the center of gravity of the balance weight 3 is separated from the axis of the rotary shaft 2. The balance correction amount becomes large. As shown in FIG. 3C, when fitted at a shallower position, the center of gravity of the balance weight 3 is further away from the axis of the rotary shaft 2, so that the balance correction amount is further increased.
In this way, a desired balance correction amount can be obtained by adjusting the depth of fitting into the notch 31 even with one type of balance weight 3 in accordance with the balance correction amount to be corrected. It becomes possible.
The angle (the direction of the notch 31) for fitting the balance weight 3 is adjusted according to the balance correction angle to be corrected. Specifically, an angle when the rotor 1 is set in a balance correction device to be described later is set to a predetermined angle.

Since the balance weight 3 includes the notch 31, the balance weight 3 can be fitted from the direction orthogonal to the rotation shaft 2, and accurate positioning and excellent workability can be obtained.
A plurality of types of balance weights corresponding to the balance correction amount to be corrected may be prepared, and any one of them may be selected, but (A), (B), and FIG. As shown in (C), by fixing the notch 31 in the balance weight 3 at an arbitrary depth, a desired different balance correction amount can be obtained using one type of balance weight.

In addition, as shown in FIG. 4, a plurality of recesses 321, 322, and 323 may be provided on the inner surface of the notch 31 of the balance weight 3 at different depths of the notch 31 as a fitting structure. Good. When one of the recesses is fitted to the outer periphery of the rotating shaft when press-fitted into the rotating shaft, the balance weight is securely held on the rotating shaft at that depth.
In addition, although the said recessed part may be circular arc shape, V-shaped, U-shaped, and sawtooth-shaped unevenness | corrugation may be sufficient.

  Note that the shape of the notch 31 of the balance weight 3 is not limited to the shape shown in FIG. 2, but various shapes such as a C-shape and an E-shape as shown in FIGS. 5 (A) and 5 (B). Needless to say, these shapes are possible.

FIG. 6 is a plan view of the balance weight 4 according to the second embodiment. The balance weight 4 is provided with a press-fitting hole 41 for press-fitting the rotary shaft in the vicinity of the center of a disk-shaped member, for example. Structure. When the balance correction amount to be corrected is small, the press-fitting hole 41 is provided in the vicinity of the center (center of gravity) G of the disk as shown in FIG. The eccentric amount d1 between the center of gravity G and the center C of the press-fitting hole is small, and as the balance correction amount to be corrected is larger as a result of balance measurement, as shown in FIG. It is provided at a position away from the center (center of gravity) G of the disk, and the amount of eccentricity d2 between the center of gravity G of the disk and the center C of the press-fitting hole becomes large.
The inner diameter of the press-fitting hole 41 of the balance weight 4 is formed to be slightly smaller than the outer diameter of the rotary shaft 2 to constitute a fitting structure, and the balance weight 4 after press-fitting is firmly fixed and easily It is configured not to shift.
The shape of the balance weight 4 is not limited to a disk shape, and the outer diameter is not limited to a circle as long as it is a plate shape.
In the case of the balance weight 4 according to the second embodiment, since the press-fitting hole is formed instead of the notch, the press-fitting is performed from the axial direction of the rotating shaft. Therefore, it is not necessary to form a groove on the rotating shaft.

Thus, by changing the position of the press-fitting hole, a desired different balance correction amount can be obtained using one type of balance weight.
In addition, like the balance weight 5 shown in FIG. 7, the press-fitting hole 51 is provided, for example, at the center position of the balance weight, and a desired balance correction amount is obtained by providing a cutout portion 52 obtained by excising a part of the balance weight. It can also be done.

FIG. 8: shows the front view of the Example of the balance correction apparatus used for the balance correction method concerning this invention.
The balance correction device 6 includes:
Rotating body setting means 61 for setting and holding a rotating body (rotor) measured by a separately provided balance measuring device so that the balance correction angle is directly above;
Supply means 62 for sequentially supplying a plurality of types of balance weights for press-fitting into the rotating shaft of the rotating body set by the rotating body setting means 61 to perform balance correction;
An optimum balance weight is picked up from the balance weight supplied by the supply means 62 in accordance with the balance correction amount to be corrected measured by the balance measuring device, and is transferred to the rotating body setting means 61. A press-fitting means 63 for press-fitting the rotary shaft on the right side of the set rotary body and the rotary shaft on the left side;
It has.

The rotating body setting means 61 includes:
Set so that the balance correction angle of the left and right surfaces of the rotating body, for example, the left surface is directly above, press the predetermined balance weight on the left surface, rotate the rotating body around the rotation axis, Rotating means 611 (see FIGS. 8 and 10) is provided for resetting so that the balance correction angle on the other surface, for example, the right surface is directly above. For example, a stepping motor or a servo motor is used as the rotating unit 611.

The supply means 62 includes
The cassettes 621a, 621b, and 621c on which a plurality of balance weights 3a, 3b, and 3c corresponding to different balance correction amounts are placed are sequentially fed in the vertical direction so as to align them at the predetermined pickup positions. A vertical feeding means 621 is provided.
When one of the head balance weights is picked up by the press-fitting means, the vertical feed means 621 sequentially feeds the next balance weight so that it is aligned with the head pickup position.
Further, as shown in FIG.
According to the balance correction amount to be corrected, a lateral feed means 622 that slides in the horizontal direction so that the leading portion of an appropriate cassette among the plurality of cassettes is located at the pickup position is provided.

The press-fitting means 63 includes
The balance weight may be press-fitted from the rotation axis on either the left or right surface of the rotating body. For example, when the left surface comes first, the balance weight corresponding to the correction amount of the left surface is supplied at the pickup position. The balance weight at the head position of any cassette of the means 62 is picked up, moved horizontally to the press-fitting position on the left surface of the rotating shaft, then descended vertically, and pressed into the rotating shaft.
Then, it rises and returns to the pickup position.
Thereafter, the balance weight corresponding to the correction amount on the right side is picked up from the leading position of any cassette of the supply means 62 at the pickup position and horizontally moved to the press-fitting position on the right side of the rotating shaft.

Between the time when the supply means 62 moves away from the left surface of the rotating shaft and before the press-fitting to the right surface starts, the rotating means 611 rotates the rotating body around its axis so that the right surface balance correction angle is directly above. Rotate to
The press-fitting means 63 descends vertically and presses a balance weight onto the right surface of the rotating shaft.
In this way, when the balance weight press-fitting to both the left and right sides with respect to one rotating body is completed, it is possible to replace with the next rotating body and subsequently perform the balance correction work.

The number of cassettes in the supply means 62 is not limited to three, and can be set to one or more depending on the degree of variation in the balance amount to be corrected and the balance accuracy after correction.
Further, the supply means 62 is not limited to the vertical feed means 621 and the horizontal feed means 622, and any means may be used as long as it can supply a balance weight according to a necessary balance correction amount.

In the balance correction device having the above-described configuration, the balance correction device has a configuration in which an appropriate balance weight is selected and press-fitted according to the balance correction amount to be corrected.
For example, as shown in FIG. 2, by using a balance weight provided with one type of U-shaped notch 31, and press-fitting to a depth corresponding to the balance correction amount to be corrected, the amount of eccentricity in the balance weight By adjusting to an arbitrary amount, an accurate balance correction amount according to the balance correction amount to be corrected becomes possible.
In this case, as shown in FIG. 1, the rotary shaft 2 is provided with a groove 21 having a width slightly narrower than the thickness of the balance weight 3 to ensure that the press-fitted balance weight does not come off due to centrifugal force. It is necessary to ensure that it is retained.

In the balance correcting apparatus having the above configuration, the balance weight having the notch is used. However, instead of the notch, the balance weight having the press-fitting hole is used as shown in FIG. It is also possible to provide a press-fit hole at a position corresponding to the correction amount, and obtain a desired balance correction amount based on the amount of eccentricity between the position of the center of gravity of the balance weight and the position of the press-fit hole.
In this case, a balance weight provided with press-fitting holes can be prepared by setting several kinds of eccentric amounts in advance, and any one can be selected and press-fitted, but one type of balance weight can be used. On the other hand, a press-fitting hole may be provided at an eccentric position corresponding to the balance correction amount to be corrected, and the balance weight may be press-fitted into the rotating shaft. In this case, by determining an arbitrary eccentric position according to the balance correction amount to be corrected, accurate balance correction according to the balance correction amount to be corrected is possible.
Thus, in the case of a balance weight provided with a press-fitting hole, instead of the press-fitting means 63 shown in FIG. 6, a press-fitting means configured to press-fitting the rotary shaft from a position on the axial extension line of the rotary shaft is provided. Use it.

  As described above, according to the balance correction apparatus of the present invention, a plurality of types of balance weights may be prepared according to the balance amount to be corrected, and any one of them may be selected and press-fitted. However, one type of balance weight may be used, and a desired eccentric amount corresponding to the balance amount to be corrected may be given and press-fitted.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotating shaft 21 Groove 3 Balance weight 31 Notch 3a, 3b, 3c Balance weight 4, 5 Balance weight 6 Balance correction apparatus 61 Rotating body setting means 62 Supply means 63 Press fit means 611 Rotation means 621 Vertical feed means 622 Horizontal feed Means 621a, 621b, 621c cassette

Claims (7)

A balance correction method for fixing a predetermined balance weight to a rotating shaft of a rotating body,
When fixing the balance weight to the rotating shaft,
One of the balance weights suitable for the balance correction amount to be corrected is selected from a plurality of types of balance weights corresponding to different balance correction amounts, and is fixed to the rotating shaft of the rotating body. A method for correcting the balance of rotating bodies. When fixing the balance weight to the rotating shaft,
The balance correction method for a rotating body according to claim 1, wherein the balance weight is press-fitted into a groove provided on the rotating shaft. A balance correction method for fixing a predetermined balance weight to a rotating shaft of a rotating body,
When fixing the balance weight to the rotating shaft,
A method of correcting a balance of a rotating body, comprising fixing a distance from an axis of the rotating shaft to a center of gravity of the balance weight according to a distance corresponding to a balance correction amount to be corrected. When providing the balance weight with a press-fitting hole for press-fitting into the rotating shaft,
The method according to claim 3, wherein the press-fitting hole is provided at a position eccentric from the center of gravity of the balance weight according to a balance correction amount to be corrected. In a balance correction device that performs a balance correction by adding a predetermined balance weight according to the balance correction amount of the rotating body measured in advance,
Rotating body setting means for setting and holding the rotating body at a predetermined position;
Supply means for sequentially supplying balance weights for press-fitting into the rotating shaft of the rotating body set by the rotating body setting means to perform balance correction;
The balance weight is received from the supply means according to the measured balance correction amount to be corrected, and is press-fitted into the right rotation axis and the left rotation axis of the rotation body set in the rotation body setting means, respectively. Press-fitting means,
A balance correction device for a rotating body, comprising: 6. The press-fitting unit selects and press-fits one of a plurality of types of balance weights supplied by the supply unit based on a balance correction amount to be corrected. The rotating body balance correcting device as described. 6. The balance correction apparatus for a rotating body according to claim 5, wherein the press-fitting means press-fits the center of gravity of the balance weight by decentering it at a position corresponding to the balance correction amount to be corrected.

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