JPH0122110Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a device for correcting the unbalance of a rotating body by additional correction.

(B) Prior Art Conventionally, motor rotor unbalance correction has been carried out by a method of deletion and correction based on the unbalance amount and unbalance position output by a balance tester. That is, for example, JP-A-49
−68786 “Method and device for balancing rotating bodies”
As shown in , this method involves cutting the iron part of the motor rotor with a milling cutter or the like.

However, not only is the correction operation itself complicated, but also the accuracy is not sufficient. In order to improve correction accuracy, it is necessary to set the feed rate and cutting depth of the milling cutter with extremely high precision, but this requires a more complex configuration. Furthermore, cutting correction reduces the strength of the iron part of the motor rotor (the part that becomes the magnetic pole column) and reduces its function as a magnetic pole.
It is impossible to cut more than a certain amount. Therefore, it is necessary to add two or three cutting positions. Moreover, such modification also deteriorates the appearance and performance of the motor rotor.

Instead of such mechanical processing methods, processing methods using laser beams, etc.
No. 49878 ``Rotational balance automatic correction device'' has also been proposed. This laser correction method is a method in which the laser irradiation time is controlled in accordance with the amount of unbalance, but the apparatus becomes large and the laser melting removal method has problems with accuracy.

For this reason, corrections are made by additions, as opposed to deletions. That is, it is a method in which the operator glues a putty-like substance or the like to the position corresponding to the unbalanced position, especially the position of the winding (coil) part. The following methods have been proposed.

(C) Problems to be solved by the invention However, the content of this proposed addition/correction method is to add intermittently to the unbalanced position during unbalance measurement, and the correction accuracy is basically low. In particular, the proposed method is a method in which additional material is released by hydraulic shock in synchronization with the unbalanced position, and the device is large, making it nearly impossible to control minute additions and making precise corrections impossible.

The present invention attempts to solve the drawbacks of conventional addition corrections by a new device that allows addition corrections to be performed while the rotating body is fixed.

(D) Means and effects for solving the problem The basic features of this invention are a mechanism for fixing a rotating body in a predetermined position on the balance test machine, and an additional mechanism for fixing the rotating body to the fixed rotating body. The main feature is that it is equipped with a mechanism for properly injecting and adding materials.
The additional material must be selected depending on the object to be corrected, but it is desirable that the material has an adhesive function or an adhesive function based on a shape factor, and that it can be applied to any object of rotation.
Next, the added material must harden quickly and, after hardening, must have creep properties that can withstand the centrifugal force generated when the rotating body rotates.However, in order to facilitate the addition, the material must be able to be injected from a nozzle at the time of addition. It is necessary that there be. That is, it is desirable that the additional material can be added to the rotating body without contact, and it is necessary that the additional material can be injected with a nozzle to facilitate the adding operation. In short, the additional material is a material that has fluidity and adhesive properties before injection and hardens on the rotating body that is the adherend, and specifically includes thermoplastic resins such as hot-melt adhesives or post-curable compositions. For example, we confirmed that reactive adhesives (epoxy adhesives) are suitable.

In the case of a motor rotor, in addition to fast curing and adhesive strength, insulation is required because the added position is the coil position. Apply pressure and inject from the nozzle. The location of the addition by injection is important, and it is practical to position the coil as close to the outer circumference of the rotor as possible. In other words, the position indicated by the arrow in Fig. 1 (coil position)
It is. The reason why it is desirable to add it to this position is as follows. Now, assuming that the weight of the motor rotor is WKg, the amount of additional correction is mg, and the radius to the correction position is rmm, the eccentric distance e of the center of gravity (radius from the center) due to unbalance is expressed by the following equation.

e=r·m/W As is clear from the formula, this eccentric distance is on the order of microns and is determined using a balance tester. This value is corrected to make it zero, but it is desirable for the quality of the motor rotor that the correction amount m be as small as possible.
Therefore, it is sufficient to make r as large as possible. However, if r is increased and added to the outer peripheral surface of the motor rotor, the quality of the motor rotor will be impaired. Therefore, the addition position was made to make r as large as possible and placed it on the coil close to the magnetic pole column. This has the effect that the attachment surface is a coil and the attachment is improved.

Now, the correction device of the present invention is based on a combination of a balance tester and an additional material injection machine for correcting unbalance.

As a balance testing machine for measuring the amount of unbalance and the position of unbalance, either a hard type or a soft type dynamic balance testing machine may be used, but it has the following characteristics. That is, a detector that detects the rotational state of the rotating body, an unbalance position measuring mechanism that measures the unbalanced position of the rotating body based on the signal from this detector, and an unbalance position measuring mechanism that measures the unbalanced position of the rotating body based on the signal from the detector, and a signal from the detector after measuring the unbalance. a rotation reduction detection mechanism for detecting that the rotation speed of the rotating body has decreased below a predetermined rotation speed; and an output from this rotation reduction detection mechanism brings the unbalanced position of the rotation body to a position that can be corrected by the injection mechanism. A fixing mechanism for fixing the rotating body and a storage mechanism for storing and holding the unbalance amount signal until a state in which the rotating body is fixed and corrected by the fixing mechanism is established.

On the other hand, the injection machine is characterized in that it is equipped with a control mechanism that controls the injection operation time of the additional material necessary for correction in accordance with the signal of the unbalance amount.

(E) Example The example shown in FIGS. 2 and 3 will be described below. The embodiment shown in FIG. 2 is an embodiment of the present invention for measuring and correcting the unbalance of a motor rotor.
The block diagram shows an ideal device in which the unbalance position (position for compensating for unbalance) after measurement is regulated to the injection nozzle position.

1 is a small motor rotor which is the object to be measured. In the illustrated example, the motor rotor 1 has eight magnetic pole columns and windings (coils) 2, and its rotating shaft 3 is rotatably supported by a bearing portion 4 of an unbalance detector 5.

Reference numeral 6 denotes an inductive detector installed close to the outer peripheral surface of the motor rotor 1, that is, a detector for detecting the rotational state, and outputs a pulse-like signal m each time each magnetic pole column approaches the detector 6. . This signal m is input to the counting circuit 7, and n signals N (N-1, N-2, N-3...N-
8) is output. That is, one pulse of each signal N is generated for each rotation of the motor rotor 1. Therefore, these n signals N
-1, N-2, N-3...If output is taken from one of N-8, only the signal from the same magnetic pole column will be output, and in that case, the magnetic pole column can be used as the reference position. In the end, a reference position signal is obtained. In the case of the illustrated example, the N-1 output of the N outputs of the counting circuit 7 is taken out and inputted as a reference signal to the measuring circuit 8 for the balance tester.

In this manner, the balance tester is operated using the detection signal from the unbalance detector 5 and the reference signal N-1, and the unbalance position (angle) and amount of unbalance are measured by the measuring circuit 8. The measured unbalance amount is displayed on an indicator (not shown), and the output of the unbalance position signal is input to the gate circuit 11. Then, a signal N (N-1, N-2, N-3,...) from the counting circuit 7 that matches the unbalanced position is output.
...N-8), for example, if the signal is now N-8, the timing signal corresponding to the unbalanced position signal passes through the gate circuit 11 only when the signal of N-8 is input to the gate circuit 11. is now being output.

Reference numeral 10 denotes a rotational speed counting circuit, which in the illustrated example receives the output signal N-1 from the counting circuit 7, and operates when the frequency of the signal N-1, that is, the rotational speed of the motor rotor 1, decreases to a certain value. to close the switch circuit 12. That is, when the unbalance measurement of the motor rotor 1 is completed, the rotation of the rotational drive source (not shown) is stopped, and the rotational speed of the motor rotor 1 is reduced. When the speed is reached, the switch circuit 12 is closed. Then, the signal N-8 passing through the gate circuit 11 is outputted via the switch circuit 12 to operate the stopper mechanism 14. Therefore, the stopper 15 protrudes and forcibly stops the motor rotor. After all, this operation of the stopper 15 is performed when the unbalanced position of the motor rotor 1 reaches a predetermined position, that is, a correction position to be described later. This correction position may be on the pole column or on the winding. In this way, the detector 6 has the dual role of detecting the rotational state in order to fix the motor 1 at a predetermined position, and also detecting the rotational state in order to measure the unbalanced position.

On the other hand, the output signal from the switch circuit 12 is input to the injection machine 16 via the delay circuit 13 as the operation signal b of the injection machine 16. At the same time, an output corresponding to the amount of unbalance is taken out from the unbalance measuring circuit 8 via the correction control circuit 9 as a signal a, and is input to the injection machine 16. In short, this signal is a signal that controls the injection time of the additional material, and is a control signal converted so that the injection amount matches the unbalanced amount. Note that the correction control circuit 9 stores and holds the unbalanced amount signal until the injection machine 16 is activated by the output signal b from the delay circuit 13.
Functions as a storage mechanism.

Both signals a and b are sent to the injection machine 1 as shown in Figure 3.
6, the gate circuit is triggered by the b signal, and the gate is opened for the duration of the signal by the a signal. That is, the injection machine 16 does not operate unless the motor rotor 1 stops rotating. In the injection machine 16, a hot-melt adhesive such as an ethylene vinyl acetate adhesive heated to a molten state is stored in a tank 19, and is pressurized to a constant pressure by a pump mechanism 22, so that a solenoid valve part 20 is heated. It is now being supplied to 18 is an injection nozzle, and 17 is a supply pipe (supply path). In response to the input of both signals a and b, the solenoid valve 20 is opened for a predetermined period of time, and a necessary amount of adhesive is injected from the nozzle 18 onto the coil portion of the motor rotor 1, thereby correcting the unbalance.

The balance testing machine for a correction device according to the present invention is not limited to the automatic positioning type testing machine for the unbalanced position as described above, but also includes a type of machine that manually sets the injection nozzle position as described above.

Of course, the present invention can also be applied to correction of rotating bodies other than motor rotors.

(F) Effects Since the present invention is as explained above, it is possible to appropriately correct unbalance using the additive method. In other words, since the added material has adhesive properties, it is suitable for addition modification, and
Since it has fluidity before injection, injection addition by the nozzle is guaranteed, and since the injection time is controlled in accordance with the amount of unbalance, accurate addition correction can be performed.

In particular, since the rotating body can be accurately stopped at the additional correction position after unbalance measurement, the accuracy of unbalance correction is improved. In addition, the output of the detector that detects the rotation state of the rotating body is used not only to measure the unbalance of the rotating body, but also to stop (fix) the rotation of the rotating body. (electric circuit) can be simplified.

[Brief explanation of the drawing]

FIG. 1 is an external view of a motor rotor, FIG. 2 is a schematic diagram of a correction device according to the present invention, and FIG. 3 is a block diagram showing the configuration of the injection mechanism shown in FIG. 2. 1...Motor rotor, 2...Coil part, 5...
...Detector, 6...Detector, 7...Counting circuit, 8...
...Balance test measurement circuit, 9...Modification control circuit,
10... Rotation speed counting circuit, 11... Gate circuit,
12...Switch circuit, 14...Stopper mechanism,
15... Stopper, 16... Injection machine, 17... Supply pipe, 18... Nozzle, 19... Tank, 2
0... Solenoid valve, 21... Gate circuit,
22... Pump mechanism, a, b... Actuation signal.

Claims (1)

[Scope of utility model registration request] A balance tester rotates a rotating body to measure its unbalance position and amount, and outputs a signal corresponding to the unbalance. and an injection mechanism that injects an additional material that has adhesive properties and hardens on the rotating body to a position that compensates for the unbalance of the rotating body, and the balance testing machine detects the rotational state of the rotating body. an unbalance position measuring mechanism that measures the unbalance position of the rotating body based on a signal from the detector; and an unbalance position measuring mechanism that measures the unbalance position of the rotating body based on a signal from the detector; a rotation reduction detection mechanism for detecting a rotation drop detection mechanism; a fixing mechanism for fixing the unbalanced position of the rotating body at a position that can be corrected by the injection mechanism based on an output from the rotation rotation detection mechanism; and this fixing mechanism. a storage mechanism that stores and holds the unbalance amount signal until a state in which the rotating body is fixed and corrected is established;
The injection mechanism includes an injection nozzle that injects the additional material, a pump mechanism that supplies the additional material to the injection nozzle at a constant pressure, and a balance tester that determines the injection operation time of the additional material by the pump mechanism and the injection nozzle. An unbalance correcting device for a rotating body, comprising: a control mechanism that performs control in accordance with the unbalance amount signal from the rotating body.