JPH0363695B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention decomposes the unbalance vector of a specimen obtained by a balance test into component force vectors in a plurality of correctable directions of the specimen. The present invention relates to an apparatus for positioning a specimen at a predetermined position in the direction of a component force vector in order to perform balancing correction processing in the direction of the component force vector.

(b) Prior art When determining the direction and magnitude of the unbalance of the specimen, that is, the unbalance vector, through a balance test, and performing balance correction processing on the specimen based on the results, it is necessary to Depending on the shape, etc., there may be restrictions on the direction in which modifications can be made. In such cases, a method is usually adopted in which the obtained unbalance vector is decomposed into component force vectors in two directions to improve the modifiability of the specimen using a component force calculation circuit, and corrections are made in those directions. .

Conventionally, automatic positioning devices for making the above-mentioned corrections first stop the reference position of the specimen at a fixed position, and then move the specimen by a predetermined angle based on the output signal from the component force calculation circuit. Rotate the first
Machining was performed by stopping the vector direction of the second component force at a fixed position, and then stopping the second component force vector direction at a fixed position. According to this conventional device, the operation of temporarily stopping the reference position of the specimen at a fixed position is redundant, and if an error occurs in positioning the reference position to the fixed position, the positioning in the direction of the force component is affected. However, there were problems with work efficiency and positioning accuracy.

(C) Purpose The present invention has been made in view of the above, and it is possible to directly position in the direction of the force component without positioning to a fixed reference position, thereby simplifying the positioning operation and improving efficiency. Another object of the present invention is to provide a positioning device in the direction of unbalanced force based on a balance test, which can also improve positioning accuracy.

(d) Configuration The present invention is characterized by first and second DC signal generators each capable of generating DC signals of a plurality of preset magnitudes, and a first and second DC signal generator capable of generating DC signals of two types of input DC signals. , a two-component synthesis circuit that outputs an alternating current signal synchronized with the reference phase signal by chopping and adding square wave signals that are synchronized with the reference phase signal and have a phase difference of 90 degrees from each other; a selection circuit that selectively inputs the output signals of the first and second DC signal generators to the two-component synthesis circuit based on the direction of the component force vector obtained by decomposing the balance vector; A rotational phase detector that inputs the reference phase signal and outputs the phase as a signal in phase with the rotational phase of the specimen, and a phase difference between the output signal of the rotational phase detector and the output signal of the two-component synthesis circuit. and a motor drive control circuit that stops the rotation of the specimen so that the phase difference detection result by the phase comparison circuit becomes zero, and the input to the two-component synthesis circuit by the selection circuit is provided. By sequentially changing the signals, the direction of the component force vector of the specimen is sequentially stopped at the fixed position.

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

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

In this embodiment, an example will be described in which the force component axes (correctable directions) are in directions of 0°, 90°, 180°, and 270° with respect to the reference position of the specimen. In this case, the first and second DC signal generators 1 and 2 generate DC signals with magnitudes of +1 and -1, respectively. The +1 output signal of the first DC signal generator 1 is led to one input terminal of _the two-component combining circuit ₃ through the switch S1, and the -1 output signal is led to the one input terminal of the two-component combining circuit 3 through the switch S2. The +1 output signal of the second DC signal generator 2 is led to the other input terminal of the two-component combining circuit ₃ through the switch _S3 , and the -1 output signal is led to the other input terminal of the second DC signal generator 2 through the switch S4. .

The two-component synthesis circuit 3 chops the input signals Dx and Dy from the respective input terminals using the square wave signals x and y supplied from the square wave shaping circuit 4, adds them, and filters them. By passing it through, an alternating current signal A is formed and output.

The square wave shaping circuit 4 generates, from the reference phase signal from the reference phase signal generator 5, a square wave signal x having a phase of 0° with respect to the reference phase signal and a switching ratio of 180°, and a reference phase signal. A square wave signal y having a phase difference of 90° and a switching ratio of 180° is shaped and supplied to the two-component synthesis circuit 3.

The specimen W is rotated by a motor 6 at a predetermined test rotation speed, and vibrations generated by the rotation are detected by a vibration sensor 7. The output of the vibration sensor 7 is introduced into an unbalance detection circuit 8, and the magnitude and direction of the unbalance of the specimen W, that is, the unbalance vector, is detected by a known method.
The unbalance vector is decomposed into two component force vectors on the previously set component force axis in the component force calculation circuit 9.

Signals related to the directions (angles with respect to the reference position of the specimen) of the two component force vectors, the first and second component force vectors, determined by the component force calculation circuit 9 are supplied to the input selection circuit 10. Ru. In response to the signal, the input selection circuit 10 first selects one of the switches S ₁ to S ₄ according to the direction of the first component force vector.
Select the magnitude of the input signals Dx and Dy to the two-component synthesis circuit 3 by closing appropriate ones,
Next, the switch is activated depending on the direction of the second component force vector.
It is configured to close appropriate ones from _S1 to _S4 and select the sizes of Dx and Dy.

A resolver 11 that uses a reference phase signal as a primary input signal is connected to the main shaft that rotates the specimen W, and the resolver 11 has the same period as the reference phase signal and the rotational phase of the specimen W. Outputs a signal with the same phase as. When the reference position of the specimen W is located at a fixed position where a drill for correction machining, etc. is arranged, a positional relationship is adopted such that the output signal of the resolver 11 is in the same phase as the reference phase signal. There is. The output signal of the resolver 11 is compared with the output signal A of the two-component synthesis circuit 3 in a phase comparator 12, and the phase difference between the two signals is detected and supplied to the motor drive control circuit 13. The motor drive control circuit 13 rotates the motor 6 so that the phase difference becomes zero.

Next, we will discuss the effect. As described above, in this example, as shown in FIG. 2, the force axis coordinates of the specimen W are 0°, 90°, and 90° with respect to the reference position of the specimen W.
force axes in the directions of 180° and 270°, respectively,
, and. For example, if the unbalance vector obtained by the balance test has a direction between the component force axis and It is decomposed into a force vector and a second force component vector on the force component axis. Based on this decomposition result, the input selection circuit 10 first closes only the switch _S1 in order to position the direction of the first component force vector, that is, the component force axis, at a fixed position. As a result, the input signal to the two-component synthesis circuit 3 becomes Dx=+1 and Dy=0. In the two-component synthesis circuit 3, this Dx is chopped with a square wave x and Dy is chopped with a square wave y and added to each other, so the signal after the addition and this are passed through a filter and the fundamental wave component is extracted from the AC output signal A. is as shown in FIG. 3a. This signal A will have a phase difference of 0° with respect to the reference phase signal. Therefore, when the motor 6 is rotated and stopped so that the output signal of the resolver 11 has a phase difference of zero with respect to the signal A, the force axis of the specimen W is positioned at a fixed position. When a correction process is performed on the component force axis in proportion to the magnitude of the first component force vector, the direction of the second component force vector, that is, the direction of the component force axis, is determined, for example, by the processing end signal. Positioning to the position is performed. In this case, only switch _S3 is closed, and Dx=0 and Dy=1 are input to the two-component synthesis circuit 3. In the same way, the signals obtained by chopping and adding each other in x and y and the AC output signal A become as shown in Figure 3b, and with respect to the reference phase signal.
Has a phase difference of 90°. Therefore, when the specimen W is positioned so that the output signal of the resolver 11 is in the same phase as the signal A, the force component axis is stopped at a fixed position.

The component force axis to be stopped at a fixed position, the switch closed by the input selection circuit 10, and the input signal of the two-component synthesis circuit 3 due to the switching
Table 1 shows the relationship between the magnitudes of Dx and Dy and the phase difference between the AC output signal A of the two-component synthesis circuit 3 and the reference phase signal. Further, the waveform of the AC output signal A at that time is shown in FIGS. 3a to 3d. in this way,
By closing the switches S ₁ to S ₄ according to the direction of the component force vector, the desired component force axis of the specimen W is stopped at a fixed position.

In the above embodiments, the balance of the specimen was described when the specimen had four force component axes spaced at 90° intervals, but the present invention can be applied to specimens having force component axes at arbitrary angular intervals. . For example 60°
To explain a specimen having component force axes at intervals, from the first DC signal generator 1 to +1, -
1 DC signal from the second DC signal generator 2 +
They are configured to generate DC signals of √3−√3, respectively, and are introduced into the two-component combining circuit 3 via switches S ₁ , S ₂ , and S ₃ , S _{4 ,} respectively. In this case, by closing the switch as shown in Table 2, the desired force component axis is stopped at a fixed position.

For example, the process of forming the AC output signal A in the two-component synthesis circuit 3 when positioning the 60° component force axis at a fixed position is as shown in FIG.

(f) Effects As explained above, according to the present invention, by changing the magnitude of the DC input signals Dx and Dy of the two-component combining circuit 3 according to the direction of the component force vector, to form an AC output signal A with a predetermined phase difference, rotate and stop the specimen so that the rotational phase detection signal of the specimen is in the same phase as the signal A, and generate the first and second component force vectors. Since the direction of the specimen is positioned at a fixed position, there is no need for the conventional operation of once positioning the reference position of the specimen at a fixed position, thereby improving work efficiency.
Moreover, it is also possible to improve positioning accuracy.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention. Fig. 2 is a diagram showing the component force axis coordinates of the specimen in the embodiment. Fig. 3 shows the output signal A of the two-component synthesis circuit 3 and the reference phase. Waveform diagram showing signal relationships, 4th
The figure is an example of a waveform diagram showing the relationship between the reference phase signal and the output signal A of the two-component synthesis circuit 3 in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... First DC signal generator, 2... Second DC signal generator, 3... Two-component synthesis circuit, 4... Square wave shaping circuit, 5... Reference phase signal generator, 6...
... Motor, 9 ... Component force calculation circuit, 10 ... Input selection circuit, 11 ... Resolver, 12 ... Phase comparator, 13 ... Motor control circuit, S ₁ , S ₂ , S ₃ , S ₄ ...
...Switch.

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Claims (1)

[Claims] 1 The unbalance vector of the specimen measured in the balance test is decomposed into multiple component force vectors in the preset correctable direction of the specimen, and based on the results, the unbalance vector of the specimen is corrected. In addition, in an apparatus for positioning the direction of the component force vector of a specimen at a predetermined position, first and second DC signal generators each capable of generating DC signals of a plurality of preset magnitudes are provided. By chopping and adding the two input DC signals using square wave signals that are each synchronized with the reference phase signal and have a phase difference of 90 degrees, an AC signal that is synchronized with the reference phase signal is generated. a two-component synthesis circuit for outputting, and a selection circuit for selecting the output signals of the first and second DC signal generators as input signals to the two-component synthesis circuit based on the direction of the component force vector; , a rotational phase detector which inputs the reference phase signal and outputs the phase as a signal in phase with the rotational phase of the specimen, and a phase difference between the output signal of the rotational phase detector and the output signal of the two-component synthesis circuit. A phase comparison circuit for detecting a phase difference, and a motor drive control circuit for stopping the rotation of the specimen so that the phase difference detection result by the phase comparison circuit becomes zero, and the selection circuit controls the two-component synthesis circuit. 1. A positioning device for unbalance component force direction based on a balance test, characterized in that the direction of the component force vector of the specimen is sequentially stopped at the fixed position by sequentially changing an input signal.