JP2008267907A - Device and method for measuring rotational balance of high-speed rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for measuring the rotational balance of a high-speed rotor, capable of accurately detecting the angle of a corrected part with a little angle detection lag and an angle and acceleration phase lag even when the rotational speed exceeds 300,000 rpm and substantially free from malfunction due to paint peel-off and the like. <P>SOLUTION: The device of measuring the rotational balance of the high-speed rotor includes a rotation support 12 for rotatably supporting the high-speed rotor 1 having a rotation shaft 2 whose end 2a is divided into two and magnetized to have N and S poles, an acceleration sensor 14 for detecting acceleration of the rotation support 12, a magnetometric sensor 16 provided near the shaft end surface to output sine and cosine wave signals according to the rotation of the rotation shaft, a rotation angle detector 18 for calculating the rotation angle of the rotation shaft from the sine and cosine wave signals, and a processing unit 20 for calculating the quantity of high-speed balance correction and its angle from the detected acceleration and the rotation angle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotation balance measuring apparatus and method for measuring a balance correction amount and angle of a high-speed rotating body.

  For example, Patent Literatures 1 to 3 have already been proposed as means for measuring and correcting the rotational balance of a high-speed rotating body such as a supercharger for a vehicle.

The “balance adjustment method and apparatus for a high-speed rotating device” disclosed in Patent Document 1 is intended to reduce the influence of vibration of the casing of the high-speed rotating device and the like, and facilitate balance adjustment during high-speed rotation.
Therefore, in the present invention, as shown in FIG. 10, a high-speed rotating device 54 to be balanced is mounted on a rigid base 53 supported by a support spring 52, and the resonance rotational speed of the rigid base 53 due to the rotation of the high-speed rotating device. By detecting the amount of vibration of the rigid base in the vicinity, balance adjustment is performed, and the rigid base 53 and the high-speed rotating device 54 are resonated in an integrated state to increase sensitivity and absorb individual differences of the high-speed rotating device. It is.

Patent Document 2 “Supercharger High-Speed Balance Correction Device and Method” aims to improve the reproducibility and correction accuracy of inspection data, reduce the number of high-speed balance corrections, and improve the number of production. To do.
Therefore, as shown in FIG. 11, the apparatus of the present invention includes an acceleration pickup 65 that picks up the acceleration of the supercharger 61 and has a magnet, and a rotation detector that detects an unbalance amount when the compressor wheel 64 rotates at high speed. 66, an arithmetic unit 67 for calculating based on the input signals detected from these detectors, and a vibration table 68 having a turbine casing mounting plate 63 for attaching the turbine casing 62, and the acceleration pickup of the vibration table. It is attached to the turbine casing mounting plate.

The “high-speed rotating body balance correction method” of Patent Document 3 aims to perform high-accuracy and highly reproducible balance correction using a conventional balance machine.
Therefore, as shown in FIG. 12, the present invention fixes and fastens the high-speed rotating body 72 by fitting and fixing the high-speed rotating body 72 to the balance correcting rotating shaft 71, and determines the unbalance amount of the high-speed rotating body 72 on the balance machine. The mounting phase of the high-speed rotating body 72 fitted and fixed to the balance correcting rotating shaft 71 is changed to measure the unbalance amount at least four times, and the apparent rotation center O ₁ of the balance correcting rotating shaft 71 is determined. The balance is corrected by obtaining the unbalance amount of the high-speed rotating body 72 with respect to the apparent rotation center O _{1 of the} balance correcting rotary shaft 1.
As a result, balance correction with high accuracy and high reproducibility is achieved by finding the unbalance amount of the high-speed rotating body with respect to the apparent center of rotation of the rotation axis for balance correction, which is difficult to correct by itself. become able to.

Japanese Patent Laid-Open No. 6-82328, “Balance adjustment method and apparatus for high-speed rotating equipment” Japanese Patent Laid-Open No. 2002-39904, “High-speed balance correction device and method for turbocharger” Japanese Patent Application Laid-Open No. 2004-150986, “Balance Correction Method for High-Speed Rotating Body”

  In rotation balance measurement of a high-speed rotating body, an acceleration sensor that detects the acceleration of a high-speed rotating body (for example, a supercharger) and a rotation detection sensor that measures the number of rotations of a shaft (rotating shaft) are used to obtain an unbalance amount. Two types of sensors are generally provided.

  FIG. 1 is a schematic diagram of a conventional rotational balance measurement, FIG. 2 is a configuration diagram of a conventional rotational balance measuring device, FIG. 3 is a relationship diagram between a rotation angle and acceleration by a conventional means, and FIG. 4 is a rotational speed ( It is a relationship diagram between a rotation speed) and acceleration.

In conventional rotation balance measurement, for example, as shown in FIG. 1, a marker for a rotation sensor is painted on the side surface or end surface of the shaft, and this is detected by an optical pickup (optical sensor).
The acceleration signal is measured by the acceleration sensor corresponding to the internal sampling pulse regardless of the rotation angle.
The rotation sensor detects the marker with an optical pickup and generates one pulse for each rotation.

The arithmetic processing unit in FIG. 2 measures the required time between pulses and calculates the rotation speed (rotation speed).
At the same time, as shown in FIG. 3, the required time between pulses is divided into a predetermined number (for example, if it is divided into 360, it corresponds to a rotation angle of 1 degree) and matched with the acceleration signal measured by the acceleration sensor. The size and position (angle) of the unbalance are obtained. In this figure, the thin line is the reference signal, and the thick line is the acceleration signal.

Further, as shown in FIG. 4, by tracking the peak value of the acceleration for each rotational speed based on the calculated rotational speed, the balance state of the rotating body is grasped and the necessity of balance correction is determined.
When it is determined that the balance correction is necessary, the correction amount (cutting amount) and the correction location (azimuth) are calculated from the relation data of the rotation angle (azimuth) and acceleration at a predetermined correction rotation speed in the arithmetic processing unit of FIG. Based on the result, balance correction (processing) is performed.

However, the conventional rotational balance measurement described above has the following problems.
(1) In a rotation detector using an optical pickup, the angle is roughly calculated (n-divided) from one pulse signal per rotation, so the accuracy of the correction location (orientation) is poor.
(2) Since the angle (azimuth) and the acceleration sensor signal are not synchronized, an error is further superimposed when the calculated orientation and the acceleration data are matched.
(3) It is necessary to apply marker paint to the rotating shaft for optical pickup, which is complicated.
Further, if the paint part is scratched during the work, an unintended pulse is generated at the paint peeling part, resulting in an erroneous calculation result.
(4) As the speed of the rotating body increases, the rotation detector using an optical pickup has a larger phase delay due to the limit of response speed, and further increases the error.

Due to the above-mentioned problems, in the conventional rotational balance measurement, the rotation speed of a high-speed rotating body (for example, a vehicle supercharger) in which the rotational speed exceeds 300,000 rpm and the response speed reaches several tens of kHz (for example, about 30 kHz or more). When measuring, there is a problem that the delay (detection delay) of the rotation detector is large (for example, 10 to 15 degrees or more) and greatly affects the accuracy of unbalance correction.
Further, if the paint is peeled off during the process, it is erroneously detected or the painting work is complicated.

  The present invention has been developed to solve the above-described problems. That is, the object of the present invention is that even when the rotational speed exceeds 300,000 rpm, the angle measurement detection delay is small, the angle and acceleration phase shifts are small, the angle at the correction location can be accurately detected, paint peeling, etc. An object of the present invention is to provide an apparatus and method for measuring the rotational balance of a high-speed rotating body that does not substantially cause malfunction due to.

According to the present invention, a rotary support that supports a high-speed rotary body having a rotary shaft whose shaft end surface is magnetized by being divided into N and S poles so as to be capable of high-speed rotation;
An acceleration sensor for detecting the acceleration of the rotating support during high-speed rotation of the high-speed rotating body;
A magnetic sensor provided close to the shaft end face and outputting a sine wave signal and a cosine wave signal by rotation of the rotating shaft;
A rotation angle detector for detecting a rotation angle of the rotation shaft from the sine wave signal and the cosine wave signal;
A rotation balance measuring device for a high-speed rotating body is provided, comprising: a balance correction amount of the high-speed rotating body and an arithmetic processing unit for calculating the angle from the detected acceleration and rotation angle.

  According to a preferred embodiment of the present invention, the magnetic sensor has two magnetoresistors arranged orthogonal to each other in a plane facing the shaft end surface.

  The rotation angle detector is a resolver / digital converter that outputs a rotation angle from an sine wave signal and a cosine wave signal as an absolute signal and an incremental signal.

  In addition, a zero angle detector is provided that generates a reference point pulse signal from the difference between the sine wave signal and the cosine wave signal.

Further, according to the present invention, the shaft end surface of the rotating shaft of the high-speed rotating body is magnetized by being divided into the N pole and the S pole,
The high-speed rotating body is supported by a rotating support so as to be able to rotate at high speed,
Detecting the acceleration of the rotating support by rotating the high-speed rotating body at a high speed;
At the same time, a sine wave signal and a cosine wave signal are output by a magnetic sensor provided close to the shaft end surface,
Detecting the rotation angle of the rotating shaft from the sine wave signal and cosine wave signal,
There is provided a method for measuring the rotational balance of a high-speed rotating body, wherein the balance correction amount and angle of the high-speed rotating body are calculated from the detected acceleration and rotational angle.

  According to a preferred embodiment of the present invention, the rotation angle is output from the sine wave signal and the cosine wave signal as an absolute signal and an incremental signal.

  A reference point pulse signal is generated from the difference between the sine wave signal and the cosine wave signal.

  According to the apparatus and method of the present invention described above, the shaft end surface of the rotating shaft of the high-speed rotating body is magnetized by being divided into the N pole and the S pole, and the rotating shaft is rotated by the magnetic sensor provided close to the shaft end surface. Therefore, even when the rotational speed exceeds 300,000 rpm, the detection delay in angle measurement can be reduced.

  In addition, the sine wave signal and cosine wave signal are output by the magnetic sensor, and the rotation angle detector detects the rotation angle of the rotating shaft from the sine wave signal and cosine wave signal, so the rotation angle can be calculated accurately rather than just the right amount. Can be obtained. In addition, there is essentially no malfunction due to paint peeling or the like.

Furthermore, since the acceleration of the rotating support is detected by the acceleration sensor and at the same time, the angle is measured by the magnetic sensor without any detection delay, there is little deviation between the phase of the angle and the acceleration, and the angle of the corrected portion can be detected accurately.
Therefore, the acceleration synchronized with the angle can be accurately measured, and the accuracy of unbalance measurement can be improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

FIG. 5 is a schematic diagram of rotation balance measurement according to the present invention, and FIG. 6 is a configuration diagram of a rotation balance measurement apparatus according to the present invention.
As shown in FIGS. 5 and 6, the rotation balance measuring device of the present invention includes a rotation support 12, an acceleration sensor 14, a magnetic sensor 16, a rotation angle detector 18, and an arithmetic processing device 20.

  In the present invention, the shaft end surface 2a of the rotating shaft 2 of the high-speed rotating body 1 is magnetized in advance by dividing it into N and S poles. The high-speed rotating body 1 is, for example, a rotor of a vehicle supercharger, but the present invention is not limited to this, and may be a motor, a crankshaft, a turbine, or the like that requires correction of the rotation balance.

The rotation support body 12 is, for example, a housing for a vehicle supercharger, and supports the high-speed rotation body so as to be capable of high-speed rotation.
The acceleration sensor 14 is attached to the rotary support 12 and detects the acceleration of the rotary support 12 when the high-speed rotary body rotates at high speed. The detected acceleration signal is input to the arithmetic processing unit 20 via the amplifier 15.

FIG. 7 is an output signal diagram of the magnetic sensor 16. In this figure, a curve passing through the origin is a sine wave signal, and a curve whose phase is shifted by 90 ° is a cosine wave signal.
The magnetic sensor 16 is provided close to the shaft end surface 2 of the high-speed rotating body 1, and outputs a sine wave signal and a cosine wave signal by the rotation of the rotating shaft. The magnetic sensor 16 has two magnetoresistors (not shown) arranged orthogonally in a plane facing the shaft end surface 2a.
When the magnetic field formed by the N pole and S pole of the shaft end surface 2a rotates, the resistance value of the magnetoresistor changes. As a result, the magnetic sensor 16 outputs a sine wave signal and a cosine wave signal as shown in FIG.

FIG. 8 is an output signal diagram of the rotation angle detector 18.
The rotation angle detector 18 detects the rotation angle of the rotary shaft 2 from the outputs (two sine wave signals) of the magnetic sensor 16.
The rotation angle detector 18 is preferably a resolver / digital converter (R / D converter), and outputs the rotation angle from the sine wave signal and the cosine wave signal as an incremental signal (A) and an absolute signal (B). It has become.

The arithmetic processing unit 20 calculates the rotation speed, the balance correction amount of the high-speed rotating body, and the angle from the acceleration signal detected by the acceleration sensor 14 and the rotation angle (incremental signal: output 1) output from the rotation angle detector 18. Calculate. The calculated correction amount and correction direction are output to a balance correction processing unit (not shown).
Further, from the rotation angle (absolute signal: output 2) output from the rotation angle detector 18, the detection position of the rotation axis (work direction) is also output to the balance correction processing unit and can be used for balance correction.

FIG. 9 is an operation explanatory diagram of the zero angle detector.
The rotation balance measuring device of the present invention further includes a zero angle detector 19. The zero angle detector 19 is a differential comparator, for example, and generates a reference point pulse signal (Z phase) from a difference between a sine wave signal and a cosine wave signal (A phase and B phase).

In the method of the present invention using the above-described apparatus, the shaft end surface 2a of the rotating shaft 2 of the high-speed rotating body 1 is magnetized by being divided into the N pole and the S pole, and the high-speed rotating body 1 is rotated at a high speed by the rotary support 12. The high-speed rotating body 1 is rotated at a high speed, the acceleration sensor 14 detects the acceleration of the rotating support body 12, and at the same time, the magnetic sensor 16 provided close to the shaft end surface 2a is used to detect a sine wave signal and a cosine wave. Output a signal.
The rotation angle detector 18 detects the rotation angle of the rotary shaft 2 from the sine wave signal and the cosine wave signal, and the arithmetic processing unit 20 calculates the balance correction amount and angle of the high-speed rotating body from the detected acceleration and rotation angle. To do.

Examples of the present invention will be described below.
Vibration generated by imbalance is measured by the acceleration sensor 14.
The rotation shaft end 2a is magnetized in advance to the S / N pole, and a rotation signal is measured using the magnetic sensor 16 using a magnetic resistance.
As the magnetic sensor 16, a magnetic sensor constituted by a magnetoresistor arranged perpendicular to the X axis / Y axis direction is used.
By rotating the magnetized shaft 2, a sine wave signal and a cosine wave signal as shown in FIG. 7 can be obtained.

[R / D converter 18: resolver (synchro) digital converter]
The R / D converter 18 converts the output signal (sine wave and cosine wave) of the magnetic sensor 16 into a rotation angle signal.
The R / D converter 18 has two types of output forms, an incremental mode (A) and an absolute mode (B) shown in FIG.
In the balance measurement by the arithmetic processing unit 20, the incremental mode (A) is used, this pulse signal is used as an AD sampling pulse, and acceleration data for each rotation angle of the shaft is input with a necessary resolution.
When the balance is corrected, the absolute mode (B) is set, and the angle signal is used to determine the machining position (orientation).
For example, if the conversion resolution of the R / D converter 18 is 10 bits (1024), it becomes 0.35 ° (= 360/1024), and measurement of 1 ° or less is possible.

  Zero angle detector 19: When the R / D converter 18 is used in the incremental mode, it is necessary to know the reference point (zero angle), so the output signal of the magnetic sensor 16 (sine wave = A phase, cosine wave = B 9B, a reference point pulse signal (= Z phase) can be generated by generating a reference point pulse signal (Z phase) from the difference between the sine wave signal and the cosine wave signal, as shown in FIG. 9B. it can.

  According to the apparatus and method of the present invention described above, a magnetic sensor provided by magnetizing the shaft end surface 2a of the rotating shaft 2 of the high-speed rotating body 1 by dividing the shaft end surface 2a into N and S poles in the vicinity of the shaft end surface 2a. Since the rotation of the rotary shaft 2 is detected by 16, there is no detection delay like an optical pickup, and even when the rotation speed exceeds 300,000 rpm, the detection delay of angle measurement can be reduced.

  Further, the sine wave signal and the cosine wave signal are output by the magnetic sensor 16, and the rotation angle of the rotary shaft 2 is detected by the rotation angle detector 18 from the sine wave signal and the cosine wave signal. It can be calculated accurately. In addition, there is essentially no malfunction due to paint peeling or the like.

Furthermore, since the acceleration of the rotary support 1 is detected by the acceleration sensor 14 and at the same time the angle is measured by the magnetic sensor 16 without detection delay, the angle between the angle and the acceleration is small, and the angle at the correction location can be detected accurately. .
Therefore, the acceleration synchronized with the angle can be accurately measured, and the accuracy of unbalance measurement can be improved.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a schematic diagram of the conventional rotation balance measurement. It is a block diagram of the conventional rotation balance measuring device. It is a related figure of the rotation angle and acceleration by the conventional means. It is a related figure of the rotation speed (rotation speed) and acceleration by the conventional means. It is a schematic diagram of the rotation balance measurement by this invention. It is a block diagram of the rotation balance measuring device by this invention. FIG. 6 is an output signal diagram of the magnetic sensor 16. FIG. 6 is an output signal diagram of the rotation angle detector 18. It is operation | movement explanatory drawing of a zero angle detector. It is a schematic diagram of the apparatus of patent document 1. FIG. It is a schematic diagram of the apparatus of patent document 2. FIG. It is a schematic diagram of the method of patent document 3. FIG.

Explanation of symbols

1 high-speed rotating body, 2 rotating shaft, 2a shaft end face,
12 rotation support body, 14 acceleration sensor,
15 amplifier, 16 magnetic sensor, 18 rotation angle detector,
19 zero angle detector, 20 arithmetic processing unit

Claims (7)

A rotation support body that supports a high-speed rotation body having a rotation axis whose axis end surface is magnetized by being divided into an N-pole and an S-pole in a manner capable of high-speed rotation;
An acceleration sensor for detecting the acceleration of the rotating support during high-speed rotation of the high-speed rotating body;
A magnetic sensor provided close to the shaft end face and outputting a sine wave signal and a cosine wave signal by rotation of the rotating shaft;
A rotation angle detector for detecting a rotation angle of the rotation shaft from the sine wave signal and the cosine wave signal;
A rotation balance measuring device for a high-speed rotating body, comprising: a balance correction amount of the high-speed rotating body and an arithmetic processing unit for calculating the angle from the detected acceleration and rotation angle.   2. The rotation balance measuring device for a high-speed rotating body according to claim 1, wherein the magnetic sensor has two magnetoresistors arranged orthogonally in a plane facing the shaft end surface.   The rotation of the high-speed rotating body according to claim 1, wherein the rotation angle detector is a resolver / digital converter that outputs a rotation angle from an sine wave signal and a cosine wave signal as an absolute signal and an incremental signal. Balance measuring device.   The rotation balance measuring device for a high-speed rotating body according to claim 1, further comprising a zero angle detector that generates a reference point pulse signal from a difference between the sine wave signal and the cosine wave signal. The shaft end face of the rotating shaft of the high-speed rotating body is magnetized by dividing it into N pole and S pole,
The high-speed rotating body is supported by a rotating support so as to be able to rotate at high speed,
Detecting the acceleration of the rotating support by rotating the high-speed rotating body at a high speed;
At the same time, a sine wave signal and a cosine wave signal are output by a magnetic sensor provided close to the shaft end surface,
Detecting the rotation angle of the rotating shaft from the sine wave signal and cosine wave signal,
A rotation balance measuring method for a high-speed rotating body, comprising calculating a balance correction amount and the angle of the high-speed rotating body from the detected acceleration and rotation angle.   6. The method for measuring the rotational balance of a high-speed rotating body according to claim 5, wherein the rotation angle is output as an absolute signal and an incremental signal from the sine wave signal and cosine wave signal.   6. The method for measuring the rotational balance of a high-speed rotating body according to claim 5, wherein a reference point pulse signal is generated from a difference between the sine wave signal and the cosine wave signal.

Images