JPH0750011B2 - Dynamic balance tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention, when measuring the dynamic imbalance of a test body, does not have the shape of the test body (for example, a pulley or a gear itself does not have a rotating spindle). The present invention relates to a dynamic balance testing machine for measuring a dynamic imbalance by mounting a test body on an adapter mounted on a rotating main shaft for measurement in order to adapt to the shape) and improve work efficiency.

B. Prior art In a dynamic balance test using an adapter, it is necessary to correct the adapter eccentricity.

As shown in the unbalanced vector diagram of FIG. 7 (A),
The adapter eccentricity vector _a is an adapter imbalance vector _ar caused by unevenness of the mass distribution of the adapter with respect to the measurement rotary spindle, and a deviation between the centerline of the fitting portion between the adapter and the test body and the measurement rotary spindle. It is a composite vector with the apparent imbalance vector _as of the test body caused by. That is, _a = _ar + _as ....

Detection imbalance vector _D obtained from the imbalance detection unit
Is a composite vector of the unbalance vector _t of the test body itself and the adapter eccentricity vector _a, and _D = _t + _a .

As is clear from the above, the detection imbalance vector _D includes the adapter eccentricity vector _a as an error.

This adapter eccentricity vector _a is a constant amount that is irrelevant to the individual difference of the test body if the test body type is the same.

Therefore, in order to obtain the test body imbalance vector _t , the eccentricity correction vector (offset vector) _os is
_{As os} = _-a, as shown in FIG. 7B, the eccentricity correction vector _os may be added to the detection imbalance vector _D at the time of actual measurement. That is, _D + _os = ( _t + _a ) + ( _-a ) = _t ... and the test body imbalance vector _t itself can be obtained.

Conventionally, the following 2 is used as a method for _obtaining the eccentricity correction vector _os.
Two methods [1] and [2] are considered.

[1] Conventional first method Shift the mounting position of the test body by 90 degrees with respect to the adapter,
The detection imbalance vector _D is measured each time. The detection imbalance vector _D obtained by this is
_{Let them be D11} , _D12 , _D13 , and _D14 . Of these, _D11
And _D12 are shown in FIG. 8 (A).

Detection unbalance vector when the mounting angle is 0 degree
_D11 is a composite vector of the adapter eccentricity vector _a11 and the test body unbalance vector _t11, and the detection unbalance vector _D12 when the mounting angle is 90 degrees is a combination of the adapter eccentricity vector _a12 and the test body unbalance vector _t12. Is a vector. That is, _D11 = _a11 + _t11 ... _D12 = _a12 + _t12 ....

The angle θ formed by the two test body imbalance vectors _t11 and _t12 is 90 degrees, which is the same as the difference between the mounting angles.

The two adapter eccentricity vectors _a11 and _{a12 are} slightly different from each other because there is a difference in the deviation between the center line of the fitting portion between the adapter and the test body and the rotating main shaft for measurement due to the mounting angle. .

However, the difference between _a11 and _{a12 is} the difference between _D11 and _D12 and
_Since it is sufficiently smaller than the difference between _t11 and _t12 , it is ignored and treated as the same vector.

FIG. 8 (B) is a vector diagram when _a11 = _a12 = _a01 . In this case, the equations are _D11 = _a01 + _t11 ... _D12 = _a01 + _t12 ... respectively. Since the vector _t12 is obtained by rotating the vector _t11 by an angle θ (= 90 degrees), it can be expressed as _t12 = _t11 · ejθ. Substituting the equation into the equation gives _D12 = _a01 + _t11 · ejθ. ， When _t11 is deleted from the formula, Becomes

From the formula, the detection unbalance vector when the mounting angle is 0 degree
_D11 and detection unbalance vector when the mounting angle is 90 degrees
_The adapter eccentricity vector _a01 can be obtained from _D12 and the angle θ (= 90 degrees).

Similarly, the adapter eccentricity vector _a02 can be obtained from the detected unbalance vector _D11 when the mounting angle is 0 degree, the detected unbalance vector _D13 when the mounting angle is 180 degree, and the mounting angle 0 degree. detection and unbalance vector _D11, and the detected unbalance vector _D14 when the mounting angle 270 °, the angle θ and adapter eccentricity from vector when the
You can ask for _a03 .

Three adapter eccentricity vectors obtained in this way
FIG. 8C shows _a01 , _a02 , and _a03 .

These three adapter eccentricity vectors _a01 , _a02 ,
_{The reason} that _a03 is different is that, as described above, the mounting angle causes a difference in the deviation between the center line of the fitting portion between the adapter and the test body and the rotating main shaft for measurement.

These three adapter eccentricity vectors _a01 , _a02 ,
_The vector obtained by averaging _a03 is the adapter eccentricity vector _a
And Becomes

The eccentricity correction vector _os is a vector symmetrical with respect to the origin O of the coordinates with respect to the adapter eccentricity vector _a , and _os = _-a .

From the above, the eccentricity correction vector _os is obtained,
If the eccentricity correction vector _os is added to the detected imbalance vector _D at the time of actual measurement, _D + _os = _t ... according to the formula, and the test body imbalance vector _t itself is obtained.

[2] Second conventional method The test body is attached to the adapter for each angle obtained by dividing 360 degrees by a natural number n of 3 or more, and the detection imbalance vector _D is measured each time.

When n is set to 3, for example, the mounting angles are 0 degree, 120 degrees, and 240 degrees. The detection imbalance vector obtained in this way
_D is three, and these are the same as in [1].
_{These are D21} , _D22 , and _D23 .

As shown in FIG. 9, the detection imbalance vector _D21 when the mounting angle is 0 degree is a composite vector of the adapter eccentricity vector _a21 and the test body imbalance vector _t21 ,
Detection unbalance vector when the mounting angle is 120 degrees
_D22 is a composite vector of the adapter eccentricity vector _a22 and the test body imbalance vector _t22 . The detection imbalance vector _D23 when the mounting angle is 240 degrees is a composite vector of the adapter eccentricity vector _a23 and the test object imbalance vector _t23 . That is, _D21 = _a21 + _t21 ... _D22 = _a22 + _t22 ... _D23 = _a23 + _t23 ....

Three test body imbalance vectors _t21 , _t22 ,
_Since the sizes of _t23 are equal to each other and the angle between them is 120 degrees, their combined vector is a zero vector. That is, _t21 + _t22 + _t23 = ... Therefore, the three detection imbalance vectors _D21 ,
_{When D22} and _D23 are combined and the average vector is calculated, three adapter eccentricity vectors _a21 ,
_{It is} the average vector of _a22 and _a23 .

That is, if the average vector is _AVE , ~
From the formula, Becomes

This average vector _AVE is a vector indicating the center of a triangle having the tips of the three adapter eccentricity vectors _a21 , _a22 , and _a23 as its vertex, and this is the adapter eccentricity vector _a (not shown). That is, Becomes

The eccentricity correction vector _os is a vector symmetrical with respect to the origin O of the coordinates with respect to the adapter eccentricity vector _a , and _os = _-a .

From the above, the eccentricity correction vector _os is obtained,
If the eccentricity correction vector _os is added to the detected imbalance vector _D at the time of actual measurement, _D + _os = _t ... according to the formula, and the test body imbalance vector _t itself is obtained.

C. Problems to be Solved by the Invention However, such a conventional correction method [1],
Both [2] have the following problems.

That is, in obtaining the eccentricity correction vector _os ,
A plurality of mounting angular positions are set as the mounting angular positions of the test body with respect to the adapter, and the detection imbalance vector is obtained at each mounting angular position. The angle had to be adjusted very strictly when changing.

If an error occurs in the mounting angle position even a little, the eccentricity correction vector _os itself will include an error, and the correction accuracy, and thus the measurement accuracy of the test piece imbalance vector, will be poor. .

In addition, if the mounting angle position is adjusted in such a strict manner, the workability is deteriorated.

The present invention has been made in view of such circumstances, and makes the mounting angle position of the test body with respect to the adapter when obtaining the eccentricity correction vector arbitrary, and improves the workability of changing the mounting angle. It is an object of the present invention to accurately obtain an eccentricity correction vector and to improve the correction accuracy and thus the measurement accuracy of the test object imbalance vector.

D. Means for Solving Problems The present invention has the following configuration in order to achieve such an object.

That is, the dynamic balance tester of the present invention, an adapter to which a test body is attached and rotated, an imbalance detection unit for detecting an imbalance of a rotating test body, and a mounting angle with respect to the adapter at the time of collecting correction data. First storage means for storing data of n detection imbalance vectors obtained from the imbalance detection unit in different n mounting modes (n is a natural number of 3 or more), and the first storage means. Calculating means for obtaining coordinates of a center of a circle passing through each tip of the n detected imbalance vectors stored in the storage means or the vicinity thereof and obtaining a vector symmetrical with respect to the origin with respect to a vector of center coordinates of the circle; The second storage means for storing the vector thus obtained as the data of the eccentricity correction vector, and the detection error obtained from the imbalance detection unit at the time of actual measurement. Fits eccentricity correction vectors stored in said second storage means to the vector is obtained and a correction means for adding.

E. Operation The operation of the structure of the present invention will be described with reference to FIG. FIG. 1A is a vector diagram showing the principle of correction data collection, and FIG. 1B is a vector diagram showing the principle of correction for the detection imbalance vector.

As shown in FIG. 1 (A), n correction imbalance vectors obtained from the imbalance detection unit at the time of collecting the correction data.
_{Let D} be _D1 , _D2 , ..., _Dn . The data of these detection imbalance vectors _D1 , _D2 , ..., _Dn are
Is stored in the storage means.

These n detection imbalance vectors _D1 , _D2 , ...,
_For each of the coordinate points P1, P2, ..., Pn at the tip of _Dn , these n
It is possible to draw a circle C passing through the coordinate points P1, P2, ..., Pn of the tips or the vicinity thereof.

The circle C is defined as all detection imbalance vectors _D1 ,
_The circle is the smallest in total of the distances from the coordinate points P1, P2, ..., Pn of the tips of _D2 , ..., _Dn (the distance between each coordinate point in the radial direction of the circle C and the circle C).

The vector from the origin O _{1 of the} vector coordinates to the coordinate point O ₂ at the center of the circle C is _o , and the vectors from the tip of the center coordinate vector _o to the coordinate points P1, P2, ..., Pn are respectively.
_{If P1} , _P2 , ..., _Pn , Becomes

Each vector _{P1, P2,} ......, _Pn, each coordinate of the circle C on or near the center point O ₂ of the circle C P1, P2, ......, P
Since they are directed toward n, their magnitudes are substantially equal to each other, and | _P1 | ≈ | _P2 | ≈ …… ≒ ｜ _Pn | (2), and these vectors _P1 , _P2 ,…, _Pn is
It is a test body imbalance vector obtained at each mounting angle. These vectors _{P1, P2,} ......, respectively _{Pn t1, t2,} ......, may be expressed as _tn.

The central coordinate vector _o is common to all the detection imbalance vectors _D1 , _D2 , ..., _Dn , which is the adapter eccentricity vector _a ( _o = _a ).

The calculation means obtains a vector ( _−o ) symmetrical with respect to the origin O ₁ with respect to the center coordinate vector _o of the circle C.
This vector ( _-o ) is stored in the second storage means as data of the eccentricity correction vector _os , _os = _-o = _-a (3).

Then, as shown in FIG. 1 (B), during actual measurement,
The correction means adds the eccentricity correction vector _os to the detected imbalance vector _D obtained from the imbalance detection unit.

The detection imbalance vector _D is the test body imbalance vector.
_t is a composite vector of the adapter eccentricity vector _a ( _D = _t + _a ), and the eccentricity correction vector _os
Is added, _D + _os = ( _t + _a ) + ( _-a ) = _t ... from the equation (3).
(4) Then, the test body imbalance vector _t itself is obtained.

In this case, the center coordinate vector _o can be obtained regardless of the coordinate points P1, P2, ..., Pn of the tips of the n detection imbalance vectors _D1 , _D2 , ..., _Dn. Yes, this is the eccentricity correction vector
_This means that the mounting angle position of the test body with respect to the adapter when determining _os may be arbitrary.

F. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

First Embodiment FIG. 2 is a block circuit diagram of a dynamic balance testing machine according to the first embodiment of the present invention.

In FIG. 2, reference numeral 1 denotes a measuring rotary spindle rotated by a drive mechanism (not shown), 2 denotes an adapter attached to the measuring rotary spindle 1, and M denotes a test body fitted and supported by the adapter 2.

Reference numeral 3 denotes an unbalance detecting unit, which detects that the rotational axis of the measuring rotary spindle 1 is displaced due to the eccentricity of the test body M and the adapter 2 with respect to the measuring rotary spindle 1. The dynamic unbalance (unbalance vector _{D 1} ) of the test body M and the adapter 2 is detected, and a signal including the data of the unbalance vector _D is output as the displacement signal S ₁ .

This displacement signal S ₁ is configured to be transmitted to the synchronous rectification circuit 5 as the addition signal S ₂ via the addition circuit 4.

Reference numeral 6 denotes a reference phase detector, which detects the rotation phase of the measuring rotary spindle 1 every 90 degrees, and the rotation phase signal S ₃ is transmitted to the two-phase pulse generation circuit 7. It is configured to be.

The two-phase pulse generation circuit 7 corresponds to the rotation phase of the measurement rotating main shaft 1 and has two-phase pulse signals S ₄ and S ₅ whose phases are different from each other by 90 degrees.
Is output to the synchronous rectification circuit 5 and the chopper circuit 14 described later.

There is no output from the chopper circuit 14 when the correction data is collected, and the displacement signal from the adder circuit 4 to the synchronous rectifier circuit 5 is output.
Only S ₁ is input (S ₂ = S ₁ ). The synchronous rectification circuit 5 outputs the displacement signal S ₁ to the A / D conversion circuit 8 as displacement signals S _X and S _{Y in the X} and Y directions which are orthogonal to each other based on the two-phase pulse signals S ₄ and S _5. Is configured.

The A / D conversion circuit 8 is configured to output an unbalance signal S ₆ indicating the detected unbalance vector _D to the CPU 9 as a digital signal based on the X direction displacement signal S _X and the Y direction displacement signal S _Y. .

The CPU 9 includes a storage unit 10 including a ROM storing a program and a RAM storing various data, a display unit 11 displaying measurement conditions, measurement results, and the like, and a keyboard for inputting measurement conditions, measurement data processing methods, and the like. 12 are connected.

The D / A conversion circuit 13 and the chopper circuit 14 connected to the output port of the CPU 9 form a correction signal generation circuit 15.

The correction signal generation circuit 15 is activated by a command from the CPU 9 during actual measurement.

The CPU 9 reads the correction digital signal S ₇ corresponding to the eccentricity correction vector _os stored in the storage unit 10 from
The D / A conversion circuit 13 outputs the correction digital signal S ₇ into an X-direction component and a Y-direction component and converts them into an analog signal, which is output to the A conversion circuit 13. S _X ′ and a Y-direction displacement signal S _Y ′ for correction are output to the chopper circuit 14.

The chopper circuit 14 inputs the X-direction displacement signal S _X ′ and the Y-direction displacement signal S _Y ′ for correction, and based on the two-phase pulse signals S ₄ and S ₅ from the two-phase pulse generation circuit 7, both signals S _X ', S _Y '
Are combined and output as a corrected displacement signal S ₁ ′ to the adder circuit 4.

The correspondence with the configuration of the invention will be described.
The RAM has n detection imbalance vectors _D1 obtained from the imbalance detection unit 3 in each of the n ways (n is a natural number of 3 or more) of attachment modes having different attachment angles with respect to the adapter 2 when collecting the correction data. The first storage means stores the data of _D2 , ..., _Dn , and the second storage means stores the data of the eccentricity correction vector _os obtained by the CPU 9.

Further, the CPU 9 obtains the coordinates O ₂ of the center of the circle C passing through the tips of the n detection imbalance vectors _{D 1} , _{D 2} , ..., _Dn stored in the storage unit 10 or their vicinity, and circles with respect to the origin O ₁ . It corresponds to a calculation means for obtaining the eccentricity correction vector _os which is symmetrical with respect to the origin O ₁ with respect to the center coordinate vector _o of C.

The correction signal generation circuit 15 corresponds to a correction unit that adds the eccentricity correction vector _os to the detected imbalance vector _D obtained from the imbalance detection unit 3 during actual measurement.

Next, the operation when the number n of the attachment modes of the test body M to the adapter 2 is 3 will be described.

Operation when collecting correction data By operating the keyboard 12, the correction data collection mode is input to the CPU 9. As a result, the CPU 9 disables the correction signal generation circuit 15. Therefore, the signal input to the adder circuit 4 is only the displacement signal S ₁ from the imbalance detection unit 3.

As shown in FIG.
Are fitted and supported at the first mounting position Q1 which is an arbitrary angle θ ₁ .

By rotating the measuring rotary spindle 1, the adapter 2
When the test body M is integrally rotated, the rotation axis of the measurement rotary spindle 1 is displaced due to the eccentricity of the test body M and the adapter 2 with respect to the measurement rotary spindle 1.

The displacement is detected by the imbalance detection unit 3 and output to the addition circuit 4 as a displacement signal S ₁ . This displacement signal S
₁ includes data of the unbalance vector _D1 of the test body M and the adapter 2 at the first mounting position Q1.

Since the correction displacement signal S ₁ ′ from the chopper circuit 14 in the correction signal generation circuit 15 is not input to the addition circuit 4, the displacement signal S ₁ from the imbalance detection unit 3 passes through the addition circuit 4 as it is. , Addition signal S ₂ (= S ₁ ) is input to the synchronous rectification circuit 5.

On the other hand, the reference phase detector 6 detects the rotational phase of the measuring rotary spindle 1 every 90 degrees and outputs the rotational phase signal S3 to the two-phase pulse generation circuit 7. The two-phase pulse generation circuit 7 outputs to the synchronous rectification circuit 5 two-phase pulse signals S ₄ and S ₅ corresponding to the rotational phase of the measuring rotary spindle 1 and having phases different from each other by 90 degrees based on the rotational phase signal S _3. .

The synchronous rectification circuit 5 uses the addition signal S ₂ input from the addition circuit 4.
Based on the two-phase pulse signals S ₄ and S ₅ , (= S ₁ ) is separated into displacement signals S _X and S _Y in the X direction and the Y direction which are orthogonal to each other and output to the A / D conversion circuit 8.

The A / D conversion circuit 8 uses the X-direction displacement signal S _X and the Y-direction displacement signal S _Y as a digital signal to the CPU 9 as an imbalance signal S ₆ indicating the detection imbalance vector _D 1 for the first mounting position Q 1. Output.

CPU9 is the unbalance signal S _6, that is, the first mounting position described above.
After the data of the detection imbalance vector _D1 about Q1 is stored in the RAM of the storage unit 10, the rotation of the measuring rotary spindle 1 is stopped.

Then, the fitting support of the adapter 2 with respect to the test body M is once released, and the test body M is again attached to the adapter 2 at an arbitrary angle θ ₂ as shown in FIG. 3B. Fit and support at position Q2.

Then, the measurement rotating main shaft 1 is rotated, and the detection imbalance vector for the second mounting position Q2 is performed in the same manner as the previous time.
_After the data of _D2 is stored in the RAM of the storage unit 10, the rotation of the measuring rotary spindle 1 is stopped.

Then, the fitting support of the adapter 2 with respect to the test body M is released, and as shown in FIG. 3 (C), the test body M is again attached to the adapter 2 at a third mounting position at an arbitrary angle θ _3. Q3
Are fitted and supported at.

Then, the measurement rotary spindle 1 is rotated, and the detection imbalance vector for the third mounting position Q3 is performed in the same manner as the previous time.
_After the data of _D3 is stored in the RAM of the storage unit 10, the rotation of the measuring rotary spindle 1 is stopped.

As a result, the data of the detection imbalance vectors _D1 , _D2 , _D3 for the first to third mounting positions Q1 to Q3 are stored in the storage unit 10.

Next, the CPU 9 causes the three detection imbalance vectors _D1 ,
_The operation of _obtaining the eccentricity correction vector _os based on _D2 and _D3 will be described with reference to FIG.

The CPU 9 reads out the data of the three detection imbalance vectors _D1 , _D2 , _D3 stored in the storage unit 10, and coordinates points P1, P at the tips of the detection imbalance vectors _D1 , _D2 , _D3.
A center coordinate vector _o of one circle C passing through 2, P3 is obtained.

Since there are three coordinate points P1, P2, P3, a circle C passing through them
Only one is always required by the geometry theorem.

Then, the CPU 9 causes the origin O _{1 with} respect to the center coordinate vector _o.
A vector ( _-o ) symmetrical with respect to is obtained, and this is stored in the RAM of the storage unit 10 as data of the eccentricity correction vector _os .

As described above, the eccentricity correction vector _os for the adapter 2 and the test body M used is obtained.

Operation during Actual Measurement Next, the operation during actual measurement of the test body imbalance vector _t will be described.

The actual measurement mode is input to the CPU 9 by operating the keyboard 12. As a result, the CPU 9 activates the correction signal generation circuit 15.

When the measurement rotary spindle 1 is rotated while the test body M is still fitted and supported at the third mounting position Q3 of the adapter 2,
The reference phase detector 6 detects the rotational phase of the measuring rotary spindle 1 by 90 degrees.
The rotation phase signal S ₃ is input to the two-phase pulse generation circuit 7 every time.

The two-phase pulse generation circuit 7 corresponds to the rotation phase of the measurement rotating main shaft 1 and has two-phase pulse signals S ₄ and S ₅ whose phases are different from each other by 90 degrees.
Is output to the synchronous rectification circuit 5 and the chopper circuit 14.

In addition, the unbalance vector of the test body M and the adapter 2 from the unbalance detection unit 3 in accordance with the rotation of the measuring rotary spindle 1.
_The displacement signal S _{1 including} the data of _D3 is input to the adder circuit 4. Since the unbalance vector _{D3 in} this case is the one at the time of actual measurement, for convenience of description, it will be expressed as the unbalance vector _D below.

On the other hand, the CPU 9 reads the data of the correction digital signal S ₇ corresponding to the eccentricity correction vector _os stored in the storage unit 10 and outputs it to the D / A conversion circuit 13.

The D / A conversion circuit 13 separates the correction digital signal S ₇ into an X-direction component and a Y-direction component and converts them into an analog signal,
The correction X-direction displacement signal S _X ′ and the correction Y-direction displacement signal S _Y ′ are output to the chopper circuit 14.

The chopper circuit 14 inputs the X-direction displacement signal S _X ′ and the Y-direction displacement signal S _Y ′ for correction, and based on the two-phase pulse signals S ₄ and S ₅ from the two-phase pulse generation circuit 7, both signals S _X ', S _Y '
_Are combined and output to the adder circuit 4 as a corrected displacement signal S ₁ ′ containing the data of the eccentricity correction vector _os .

In the adder circuit 4, the displacement signal S _{1 including} the data of the detected imbalance vector _D from the imbalance detection unit 3 and the corrected displacement signal S ₁ ′ including the data of the eccentricity correction vector _os from the chopper circuit 14 are generated. Is added.

Addition of _{(S 1 + S 1 '=} S 2) , as is clear from FIG. 1 _{(B), D + os =} (t + a) + (- a) = corresponds to _t.

Therefore, the addition signal S _{2 including} the data of only the test body imbalance vector _t is output from the addition circuit 4 to the synchronous rectification circuit 5.

The synchronous rectification circuit 5 uses the addition signal S ₂ input from the addition circuit 4.
On the basis of the two-phase pulse signals S ₄ and S ₅ to separate X-direction and Y-direction displacement signals S _X and S _Y , which are orthogonal to each other, and then the A / D conversion circuit 8
Output to.

The A / D conversion circuit 8 outputs an unbalance signal S ₆ indicating only the unbalance vector _{t of the} test object as a digital signal to the CPU 9 based on the X direction displacement signal S _X and the Y direction displacement signal S _Y , and outputs it to the CPU 9.
U9, together with storing data for only a disproportionately signal S ₆ That specimen disproportionately vector _t to the RAM of the storage unit 10, the test body disproportionately on the display unit 11 vector
After displaying the data of _t, the rotation of the measuring rotary spindle 1 is stopped.

It goes without saying that the data of the test body imbalance vector _t stored in the storage unit 10 and displayed on the display unit 11 does not include the adapter eccentricity vector _a which is an error.

Second Example Next, a second example will be described. Also in the second embodiment,
The structure of the block circuit is similar to that of the first embodiment (FIG. 2).

The second embodiment is different from the first embodiment in that
It is in the way of taking the coordinate points P1, P2, P3 which are the reference for obtaining the circle C.

That is, as shown in FIG. 5, three detection imbalance vectors _D1-1 , _D1-2 , and
_D1-3 are sequentially obtained, and each detection _imbalance vector
Data in which data indicating the first mounting position Q1 is added to each of _D1-1 , _D1-2 , and _D1-3 is stored in the storage unit 10.

The second mounting position three detecting unbalance vector even in Q2 _{D2-1, D2-2,} sequentially seeking _D2-3, each detection unbalance vector _{D2-1, D2-2,} each _D2-3 The data to which the data indicating the second mounting position Q2 is added is stored in the storage unit 10. Similarly, at the third mounting position Q3, three detection imbalance vectors _D3-1 ,
_D3-2, sequentially seeking _D3-3, each detection unbalance vector _{D3-1, D3-2,} the data added with data indicating the third mounting position Q3 to the respective _D3-3 in the storage unit 10 Remember.

The data of the first to third attachment positions Q1 to Q3 is added by inputting from the keyboard 12.

The CPU 9 sequentially reads the data of the detection imbalance vector from the storage unit 10 and calculates the average vector of only the data of the detection imbalance vectors indicating the same mounting position. That is, Ask for. And these three average vectors _AVE1 ,
_{Store AVE2} and _AVE3 in the storage unit 10.

Next, the CPU 9 _reads the data of the average vectors _AVE1 , _AVE2 , and _AVE3 at the first to third attachment positions Q1 to Q3 from the storage unit 10, and the average vectors _AVE1 , _AVE2 ,
The center coordinate vector _o of one circle C passing through the coordinate points R1, R2, R3 (points indicated by circles in the figure) at the tip of _AVE3 is obtained.

As described above, the second embodiment differs from the first embodiment in the method of obtaining the circle C that is the basis for _obtaining the center coordinate vector _o .

The other points are similar to those of the first embodiment.

That is, the CPU 9 determines the origin of the central coordinate vector _o .
A vector ( _−o ) symmetrical with respect to O ₁ is obtained, and this is stored in the RAM of the storage unit 10 as the eccentricity correction vector _os .
In the embodiment, this eccentricity correction vector _os is added to the detection imbalance vector _D.

In the case of the second embodiment, the adapter 2 is used to obtain the circle C.
Since the reference vector is the average vector of the three detection imbalance vectors collected in the same mounting manner of the test body M with respect to, the influence due to the variation of the detection imbalance vectors can be reduced, and the effect of the first embodiment can be reduced. Higher precision measurement than in the case is possible.

The number of detection imbalance vectors sampled and averaged in the same mounting manner may be other than three, that is, two or four or more.

Third Example Next, a third example will be described.

In the first and second embodiments, the test body imbalance vector
A correction signal generation circuit 15 including a D / A conversion circuit 13 and a chopper circuit 14 and an addition circuit 4 are provided as a configuration for adding the eccentricity correction vector _os to the detection imbalance vector _D when performing correction for obtaining only _t. Although the correction is performed by the hardware configuration using and, in the third embodiment, this correction is processed by the software in the CPU 9.

The block configuration in this case is as shown in FIG. 6, and the load on the software is increased, but the configuration of the hardware is simplified, which is advantageous for cost reduction.

In the case of this embodiment, the CPU 9 serves as the calculating means and the correcting means in the configuration of the invention.

G. Effects of the Invention According to this invention, the following effects are exhibited.

For the n coordinate points P1, P2, ..., Pn at the tips of the n detection imbalance vectors _D1 , _D2 , ..., _Dn obtained from the imbalance detection unit at the time of collecting the correction data, these n coordinate points P
The center coordinate vector _o of a circle C passing through 1, P2, ..., Pn or its vicinity is all detection imbalance vectors.
_{It is} a vector common to _D1 , _D2 , ..., _Dn and becomes an adapter eccentricity vector _a ( _o = _a ).

About this center coordinate vector _o , a vector ( _−o ) symmetric with respect to the origin O ₁ is used as an eccentricity correction vector _os (= −
_o = _-a ), and the detection imbalance vector _D (= _t + _a ) obtained from the imbalance detection unit at the time of actual measurement.
Since the eccentricity correction vector _os is added to the above, _D + _os = ( _t + _a ) _-a = _t, and the test body imbalance vector _t itself can be obtained.

In this case, the center coordinate vector _o can be obtained regardless of the coordinate points P1, P2, ..., Pn of the tips of the n detection imbalance vectors _D1 , _D2 , ..., _Dn. Therefore, the mounting angular position of the test body with respect to the adapter when _obtaining the eccentricity correction vector _os can be set arbitrarily.

Therefore, the problem of having to adjust extremely strictly when changing the mounting angle because there are multiple mounting angle positions as in the past, and the problem of the influence from the error of the mounting angle position are solved. To be done.

That is, according to the present invention, the workability of changing the mounting angle can be improved, the eccentricity correction vector can be accurately obtained, and the correction accuracy and thus the measurement accuracy of the test piece imbalance vector can be improved. .

[Brief description of drawings]

FIG. 1 is provided for explaining the operation of the present invention. (A) is a vector diagram showing a principle of correction data collection, and (B) is a vector diagram showing a principle of correction for a detection imbalance vector. 2 to 4 relate to the first embodiment of the present invention, and FIG. 2 is a block circuit diagram of a dynamic balance tester, and FIG.
FIG. 4C is a schematic plan view showing a change in the manner of mounting the test body on the adapter, and FIG. 4 is a vector diagram showing how to obtain the eccentricity correction vector. FIG. 5 is a vector diagram showing how to obtain the eccentricity correction vector in the case of the second embodiment, and FIG. 6 is a block circuit diagram of the third embodiment. FIG. 7A is an unbalanced vector diagram, and FIG. 7B is a vector diagram showing the principle of correction for the detection imbalance vector. 8A to 8C are vector diagrams showing a conventional first method for obtaining an eccentricity correction vector, and FIG. 9 is a vector diagram showing a conventional second method for obtaining an eccentricity correction vector. Is. 2 ... adapter 3 ... imbalance detection unit 9 ... CPU (calculation unit, correction unit) 10 ... storage unit (first and second storage unit) 15 ... correction signal generation circuit (correction unit) M ... … Specimen C …… Circle O ₁ …… Origin O ₂ …… Center of circle C _os …… Eccentricity correction vector _t …… Specimen imbalance vector _D …… Detection imbalance vector _{D 1} , _D2 , _D3 , _Dn …… Detection _imbalance vectors _D1-1 , _D1-2 , _D1-3 , _D2-1 , _D2-2 ,
_{D2-3, D3-1, D3-2, D3-3} ...... detecting unbalance vectors P1, P2, P3, Pn ...... detecting unbalance vectors _{D1, D2,}
Coordinate points of the tip of _{D3 AVE1} , _AVE2 , _AVE3 …… Average vector R1, R2, R3 …… Coordinate points of the tip of _AVE1 , _AVE2 , _AVE3

Claims (3)

[Claims] 1. An adapter for mounting and rotating a test body,
An unbalance detection unit that detects an unbalance of a rotating test body, and the unbalance detection in each of n (n is a natural number of 3 or more) mounting modes in which the mounting angle to the adapter is different when collecting the correction data. First storage means for storing the data of the n detection imbalance vectors obtained from the section, and a circle passing through each tip of the n detection imbalance vectors stored in the first storage means or in the vicinity thereof. Arithmetic means for obtaining the coordinates of the center of the circle and a vector symmetrical with respect to the origin for the vector of the coordinates of the center of the circle with respect to the origin, and second storage means for storing the thus obtained vector as data of the eccentricity correction vector At the time of actual measurement, the eccentricity correction vector stored in the second storage means is calculated with respect to the detected imbalance vector obtained from the imbalance detection unit. Dynamic balancing tester and a calculation for correcting unit. 2. The number n of the mounting modes is 3, and the computing means obtains the coordinates of the center of a circle passing through the tips of the three detection imbalance vectors, and the vector of the coordinates of the center of the circle with respect to the origin. The dynamic balance testing machine according to claim (1), which obtains a vector symmetrical with respect to the origin. 3. The detection imbalance vector stored in the first storage means in each of the attachment modes is an average vector of a plurality of detection imbalance vectors sampled in the same attachment mode. The dynamic balance tester according to item (1) or (2).