JPH0363694B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention involves positioning a specimen at a predetermined angular position where an unbalance exists in order to make corrections to the specimen based on a balance test. Regarding equipment.

(b) Prior Art In this type of conventional device, the unbalance angle position of the specimen is positioned at a predetermined fixed position, for example, at a position where a correction drill is installed. By the way, when modifying a specimen, it is often not possible to balance it out by modifying one location, depending on the magnitude of the imbalance. In such a case, correction processing is performed at a plurality of locations centered on the unbalanced angular position. With conventional positioning devices, the unbalance angle position is positioned at a fixed position regardless of the size of the unbalance, so there is no problem if only one location needs to be corrected, but if multiple locations need to be corrected. , the operator intuitively allocates correction points around the stop position and makes corrections, and in this case, a balancing error is likely to occur. Furthermore, even if the angle pitch for corrective machining is determined to be 10 degrees, and the position of the specimen is linked to the meter, etc., this alone will cause the following problems, resulting in machining errors. This is likely to occur and is inefficient. In other words, when an odd number needs to be corrected, it is necessary to make corrections at the stop position, that is, the unbalance angle position, and every 10 degrees on both sides of it, as shown in Figure 4.When an even number needs to be corrected, the correction must be made at the stop position. Without any machining, correction machining must be performed at positions 5°, 15°, etc. on both sides from that position. Since the operator has to perform correction work after making this judgment, errors in judgment and efficiency problems cannot be resolved.

(c) Purpose The present invention has been made in view of the above, and instead of stopping the unbalance angle position at a fixed position, it adjusts the angle position according to the number of correction points based on the magnitude of the unbalance.
Among one or more correction points based on a preset pitch, the most extreme correction point can be positioned at a fixed position, and correction errors can be reduced by making corrections at the above-mentioned constant pitch from that position. It is an object of the present invention to provide a positioning device that can perform correction work efficiently and without any problems.

(d) Structure The feature of the present invention is that the unbalance vector of the specimen obtained by the balance test is 90°.
The magnitude and angular position of the unbalance can be determined by chopping and combining two types of DC signals corresponding to component force components using square wave signals that are synchronized with the reference phase signal and have a phase difference of 90°. In the device for determining the magnitude of the unbalance, the magnitude of the unbalance is discriminated into a plurality of ranks corresponding to the number of correction points set in advance, and the phase of the above-mentioned reference phase signal is adjusted to a predetermined value according to the discrimination result. By shifting by the angle, the farthest correction point among one or more correction points based on the preset pitch is positioned at the fixed position depending on the number of correction points based on the size of the unbalance. The reason is that it is configured so that

(e) Examples Examples of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention.

The characteristic feature of this embodiment of the present invention over the conventional device is that a phase shift circuit 7 and a rank discrimination circuit 6 are provided, and the phase of the reference phase signal is phase shifted by an amount corresponding to the discrimination result by the rank discrimination circuit 6. The reason is that the shift is performed by the circuit 7.

A two-component synthesis circuit 1 receives direct current signals x and y corresponding to 90° component force components of the unbalanced belt of the specimen obtained by the balance test, and converts them into 90° A square wave signal having a phase difference of 1 and 2 is chopped, respectively, and a signal obtained by combining these signals is output. The square wave shaping circuit 2 inputs the reference phase signal via the phase shift circuit 7, and generates a square wave signal and a square wave signal having a phase difference of 0° and 90° with respect to the input signal, respectively, and a switching ratio of 180°. Output.

The output 4 of the two-component synthesis circuit 1 is rectified by the rectifier circuit 3, and then introduced into the storage circuit 4 and stored therein. In addition, the output A is introduced into a phase comparator circuit 5, which compares the phase of the output A with the output signal of the resolver that is linked to the rotation of the specimen, and outputs a signal according to the difference. Output. A reference phase signal is used as the primary side input signal of the resolver.

A rank discriminating circuit 6 determines which rank the size of the stored contents of the memory circuit 4 has among a plurality of preset ranks.
The shift amount of the phase shift circuit 7 is determined based on the determination result.

Next, we will discuss the effect. The signal waveform of each part when the shift amount by the phase shift circuit 7 is 0° is
As shown in the figure. In this case, the square wave signal and the phase difference with respect to the reference phase signal are 0° and
It becomes 90°. The two-component synthesis circuit 1 outputs a signal A using the DC signals x and y and the square wave signal according to the following procedure. That is, the DC signal x is chopped with a square wave signal, and the signal y is chopped with a square wave signal, and the obtained signals B and C are added to obtain a signal D. By passing the signal D through a filter, a sine wave signal A containing only the fundamental wave component of the reference phase signal is obtained. The amplitude U of this signal A is proportional to the magnitude of the unbalance of the specimen;
The phase difference θ with respect to the reference phase signal has a certain relationship with the angular position where the unbalance of the specimen exists. The above is a known technique, and the contents of the memory circuit 4 that stores the rectified signal A is a detected value of the magnitude of unbalance of the specimen, and
By comparing the phases of the signal A and the output signal of the resolver and positioning the specimen at a point where the difference becomes 0, that is, by using the output of the phase comparator circuit 5 as an angular positioning signal, the defect of the specimen is determined. The balance angle position can be positioned in a fixed position.

Now, when the number of correction points is one or more depending on the magnitude of the imbalance, the reference voltage of the rank discrimination circuit 6 is set in correspondence with the number of correction points. In other words, if the size of the unbalance requires correction in one place, it will be ranked 1, if it is in two places, it will be ranked 2...
According to the contents of the memory circuit 4, the rank discrimination circuit 6
output changes. With this output, the number of correction points is displayed and the amount of shift of the reference phase signal by the phase shift circuit 7 is changed. for example,
If it is specified to be corrected at a pitch of 10°,
The shift amount for each rank is set to 0° for rank 1 (number of correction points is 1), 5° for rank 2 (same 2), 10° for rank 3 (same 3), etc. If the phase of the reference phase signal is shifted by α° by the phase shift circuit 7 and input to the square wave shaping circuit 2, the output signal A of the two-component synthesis circuit 1 will be shifted by θ with respect to the original reference phase signal.
There will be a phase difference of +α°. Therefore, so that this signal A matches the phase of the output signal of the resolver whose primary side input signal is the original reference phase signal,
When the specimen is positioned, the unbalance angular position of the specimen is shifted by α° from the normal position. By setting this α° for each rank corresponding to the number of points requiring correction as described above, one of the extreme points of the points requiring correction is positioned at a fixed position, as shown in Figure 3. . Therefore, the operator first needs to correct the position, and then sequentially shifts the specimen by 10 degrees in a predetermined direction depending on the number of points that require correction.

In addition, when shifting the specimen in a predetermined direction by, for example, 10 degrees, the angle can be accurately determined by the following three methods. One of them is
The meter is caused to swing by the output of the phase comparison circuit 5, and the specimen is rotated by hand so that the indicated value becomes 0°. This means that the first positioning stop has been performed. Then, attach a scale every 10 degrees to the meter,
This method involves sequentially rotating the specimen so that the indicated value changes by 10 degrees. The second is the phase comparator circuit 5
The output signal is supplied to the control circuit of the motor that drives the specimen, and the motor is stopped so that the output signal of the phase comparator circuit 5 becomes 0, thereby performing the first positioning stop. Then, a notch was provided at every 5° on the rotating main shaft of the specimen, and a notch that fit into the notch was provided.
In this method, the specimen is rotated by hand from the initial positioning stop position, and corrections are made each time the notch fits into the second notch. Furthermore, thirdly, in the first positioning, the motor is automatically stopped so that the output of the phase comparator circuit 7 becomes 0, as in the second position above, and then the shift amount by the phase shift circuit 7 is changed by two ranks. This method automatically rotates the motor in 10° increments by decreasing the amount by 10°. In the present invention, the above three
It can be applied to any of the two positioning methods.

(F) Effect As explained above, according to the present invention, the unbalance angular position of the specimen deviates from the normal position by a predetermined angle depending on the number of correction points based on the magnitude of the unbalance. As a result of this positioning, among the one or more correction points, the farthest correction point in a predetermined direction is stopped at the fixed position, so corrections are made every predetermined pitch in a predetermined direction from the stopped position. By adding , accurate corrections can be made, and error-free and efficient correction work can be performed without relying on the operator's sense and judgment as in the past.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, Fig. 2 is a signal waveform diagram of each part thereof, Fig. 3 is an explanatory diagram of its operation, and Fig. 4 is an explanatory diagram of the operation of a conventional positioning device. . DESCRIPTION OF SYMBOLS 1... Two-component synthesis circuit, 2... Square wave shaping circuit, 3... Rectifier circuit, 4... Memory circuit, 5... Phase comparison circuit, 6... Rank discrimination circuit, 7... Phase shift circuit.

Claims (1)

[Claims] 1. Two types of DC signals corresponding to the 90° component of the unbalance vector of the specimen obtained in the balance test are each synchronized with the reference phase signal.
By chopping and synthesizing square waves with a phase difference of 90°, the magnitude and angular position of the unbalance existing in the specimen are determined, and the above angular position is set at a predetermined position in order to make corrections to the specimen. A device for positioning and stopping at a position includes a circuit that discriminates the magnitude of the unbalance into a plurality of preset ranks, and a circuit that shifts the phase of the reference phase signal by a predetermined angle in accordance with the discrimination result. The above rank corresponds to the number of correction points based on the size of the imbalance, and according to the number, the most extreme correction point among one or more correction points based on a predetermined pitch is determined. A positioning device for an unbalance correction position, characterized in that it is configured to be positioned at the above-mentioned fixed position.