JPH1130557A - Apparatus and method for measuring shaft holding torque - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shaft holding torque-measuring apparatus that can easily confirm absolute value of the shaft holding toque under measuring, and measure a correct shaft holding torque. SOLUTION: The apparatus for measuring a shaft holding torque of a rotary body provides a suction force to stationarily hold a rotary shaft 3 by magnetic pole constitution 1, 2 on the fixed side and rotary side. The measuring apparatus has a driving device 23 for driving the rotary shaft from outside via a torque converter 6, couples the rotary shaft 3 with a shaft 25 of the torque converter by means of a coupling 7 which does not apply a restriction force at the stationary time, and includes recording devices 14, 15 recording a zero point and a peak value of the shaft hold torque between opposite magnetic poles every time the rotary shaft rotates once.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for measuring a shaft holding torque in a rotating body having a magnetic pole structure on a fixed side and a rotating side and having a suction force for holding the rotating shaft stationary.

[0002]

2. Description of the Related Art In the measurement of a shaft holding torque in a rotating body having a suction force for holding a rotating shaft stationary with a magnetic pole configuration on a fixed side and a rotating side, conventionally, a half coupling is provided at an end of the rotating shaft. And using the half coupling,
A method has been used in which a measurement arm having a predetermined length is fixed, and the end of the arm is measured over a circumference using a torque meter or a spring balance. Recently, a torque converter and a distortion amplifier are used, a torque converter is directly connected to a rotating shaft, a means for driving the torque converter is provided, and an output of the distortion amplifier (hereinafter referred to as an output of the torque converter) is read. A method has also been adopted.

[0003]

SUMMARY OF THE INVENTION In the prior art,
In the method of measuring over one circumference with a torque meter or a panel scale, the weight of the measurement arm is added when measuring upwards while measuring over one circumference unless the weight of the measurement arm is lightweight, When measuring downward, the weight of the measuring arm may be subtracted, causing a large error in the measured value.

In addition, every time measurement is performed over the number of magnetic poles, an indicated value of a torque meter, a spring balance, or the like must be read and recorded, so that much time is required for the measurement. When a torque converter is used, since the rotating shaft and the torque converter are directly connected, it is related to the arrangement of the magnetic poles for holding torque and the rotating speed for driving.However, the rotating shaft is constantly connected to the magnetic pole with the stronger force. It may not be possible to confirm the zero point of the torque output during measurement unless the direct connection between the rotating shaft and the torque converter is cut off.Therefore, even if the output of the torque converter is recorded by a pen recorder, etc. Even if the zero point shifts on the way, the absolute value (difference between the zero point and the peak value) of the shaft holding torque during the measurement cannot be confirmed each time, so that there is a possibility that the measurement may be performed with the zero point shifted.

Accordingly, it is an object of the present invention to provide a shaft holding torque measuring device capable of easily confirming the absolute value of the shaft holding torque during measurement and measuring the shaft holding torque accurately.

[0006]

According to the first aspect of the present invention, there is provided a rotating body having a magnetic pole configuration on a fixed side and a rotating side and having a suction force for holding a rotating shaft stationary. In the shaft holding torque measuring device, there is a driving device for driving the rotating shaft from the outside via a torque converter, and the rotating shaft and the shaft of the torque converter are connected by a coupling that does not apply a restraining force when stationary. And a recording device for recording a zero point and a peak value of the shaft holding torque for each of the opposed magnetic poles during one rotation of the rotating shaft.

According to a second aspect of the present invention, the driving device according to the first aspect of the present invention has a speed reducing device for reducing the rotation speed of the torque converter shaft between the torque converter and the driving motor. A shaft holding torque measuring device is provided.

According to a third aspect of the present invention, a reference position determining device for determining a reference position for measurement is provided on the rotating shaft according to the first or second aspect of the present invention, and the output thereof is input to a recording device. A shaft holding torque measuring device is provided.

According to a fourth aspect of the present invention, there is provided a method for measuring a shaft holding torque of a rotating body having a magnetic pole structure on a fixed side and a rotating side and having a suction force for holding the rotating shaft stationary, the torque conversion of the rotating shaft being performed. Externally driven through a container,
The rotating shaft and the torque transducer shaft are connected by a coupling that does not apply a restraining force when stationary, and the zero point and peak value of the shaft holding torque for each of the opposed magnetic poles during one rotation of the rotating shaft are recorded. A method for measuring a shaft holding torque is provided.

According to the first and fourth aspects of the present invention, the loose torque coupling is provided between the rotating shaft and the torque converter shaft, and the torque converter shaft is driven from the outside, so that the torque is reduced. With the output of the converter, the zero point and the peak value of the shaft holding torque can be measured for each of the opposed magnetic poles while the rotating shaft makes one revolution.

According to a second aspect of the present invention, a speed reducer or the like is disposed between the torque converter shaft driving device and the torque converter shaft in the first aspect of the present invention, and a direct connection between the portions is provided. By rotating the shaft at an extremely low speed, it is possible to obtain a record in which the absolute value (zero point and peak value) of the shaft holding torque can be visually confirmed with a pen recorder or the like.

According to the third aspect of the present invention, a distribution of a shaft holding torque with respect to one rotation of the rotating shaft is further provided in the above means.
A signal is generated at the timing of the measurement start position by the reference position determination device so that the position of the measurement record can be determined so that the positional relationship can be compared (for example, comparison of the number of objects).

[0013]

FIG. 1 shows an embodiment to which the present invention is applied, and the configuration will be described based on this embodiment. In FIG. 1, a magnetic pole 1 is arranged on the inner diameter side of the fixed side, and a rotating shaft 3 having teeth facing the magnetic pole 1 or an iron core 2 (or having the reverse configuration) is arranged on the rotating side. The body 4 is constituted. The rotating shaft 3 of the rotating body 4 has a shaft holding torque 5 for stopping the rotating shaft itself by a magnetic attraction force due to a magnetic pole configuration.

A driving device 23 whose rotation speed can be arbitrarily changed.
The shafts 24 and 25 of the torque converter 6 are directly connected to each other, and the coupling 25 between the shaft 25 on the opposite side of the torque converter 6 and the rotating shaft 3 does not apply a restraining force at rest, that is, the loose coupling 7.
It is directly connected with play.

The driving device 23 is a driving power source 8 for an electric motor which can control the rotation speed and the rotation direction arbitrarily, such as an inverter device or a Leonard device.
And a drive motor 9 electrically connected to the drive power source 8, such as an induction motor or a DC motor, and a reduction gear 10 (for example, a reduction gear) connected to the drive motor 9 by a shaft 26. I have.

A disk 11 having a reference position for detecting the shaft position is temporarily attached to the rotating shaft 3, and a photoelectric detector for detecting the reference position from the fixed side and outputting a signal correspondingly thereto. 12 are arranged.

In the above configuration, the output of the torque converter 6 is input to the pen recorder 14 having a memory function together with the signal of the photoelectric detector 12 via the distortion amplifier 13. Further, the pen recorder 14 is electrically connected to the computer 15 to input data.

The memory recording of the pen recorder 14 can be performed by setting a sampling time interval in consideration of the rotation speed of the rotating shaft 3 and the resolution according to the number of magnetic poles 1 when the computer 15 processes data. Each peak value can be extracted.

Next, the coupling 7 with play will be described with reference to FIG. A shaft 25 of the torque transducer 6;
Each half-coupling 16 of the rotary shaft 3 has a bolt hole 17 appropriately arranged in accordance with its size. The half-couplings 16 have bolts and nuts smaller in diameter than the bolt hole 17. At 18, the half coupling 16 is loosely tightened so that no restraining force is applied.

FIG. 3 shows an example of the output of the pen recorder 14 of the measurement result according to the present invention. The operation of the embodiment of the present invention will be described based on this. In the figure, the vertical axis indicates the shaft holding torque and the horizontal axis indicates the time t.

When the drive motor 9 is driven by the drive power supply 8 shown in FIG. 1, the torque converter 6 is rotated at a very low speed by the reduction gear 10 at a constant speed. During rotation, the magnetic pole 1 and the teeth of the rotating shaft 3
Alternatively, when the iron core 2 is at the same position, the rotating shaft 3 is stopped by the porcelain attractive force and is in a holding state, and the torque converter 6 is released by the loose coupling 7, and the torque output is shown in FIG. It becomes zero point 19.

When the magnetic pole 1 and the teeth or the iron core 2 of the rotating shaft 3 deviate from the same position, the backlash of the loose coupling 7 is restrained by the shaft holding torque and the rotational force on the measurement side, and the torque output has a peak value of 20. And this peak value 2
After 0, the restraint of the loose coupling 7 is gradually released, the torque output decreases, and the zero point 19 is reached.
This peak value 20 is the shaft holding torque 5. Then, the absolute value of the shaft holding torque is obtained from the difference between the peak value and the zero point.

Further, when the rotating shaft 3 reaches a reference position indicated on the disk 11, a reference position signal 21 is inputted from the photoelectric detector 12 and recorded. When the rotation direction is reversed, the torque output is reversed in polarity like the reverse rotation torque output 22, and similarly, the shaft holding torque such as the peak value 20 and the zero point 19 of the torque can be measured.

FIG. 4 shows a measurement example in which the embodiment of the present invention is applied to other portions without using a coupling without play. As can be seen, the peak value 20 of the torque between the magnetic poles is recorded, but since the zero point cannot be measured, the absolute value of the shaft holding torque during the measurement cannot be determined.
Except for the case where the values are exactly the same in the forward and reverse rotations, the torque may move in the forward or reverse rotation direction, and it is not always sufficient to halve the full swing width in the forward and reverse rotations.
Therefore, it is impossible to accurately measure the absolute value of the shaft holding torque.

Therefore, according to the shaft holding torque measuring device according to the embodiment of the present invention, the absolute value of the shaft holding torque can always be visually checked with a pen recorder or the like even during the measurement, so that the deviation of the zero point of the torque output can be noticed. You don't have to.

From the reference position signal and the number of magnetic poles, it is possible to perform effective measurement without excess or deficiency of the measurement, and the positional relationship in the forward / reverse rotation can be determined by the relationship with the reference position signal. Can be compared in reverse rotation.

Since the measurement in the human system is excluded, the measurement can be performed by a single measuring person only by setting the measuring instrument before the measurement, and the measurement accuracy and the reproducibility of the measurement are improved in each stage. Becomes In addition, a peak value for each magnetic pole is extracted from the data taken into the memory, a pie chart is drawn in forward / reverse rotation over one rotation of the rotation axis with respect to this peak value, a list of measurement results, a maximum value, a minimum value, Processing according to the purpose of use, such as average value output and determination, can be performed.

Thus, no matter which way the rotating shaft is rotated during actual operation, it is possible to accurately measure and determine the torque to be held for the rotating shaft.

[0029]

According to the first and fourth aspects of the present invention, since the loose coupling is arranged between the rotating shaft and the torque converting shaft, the rotating shaft makes one revolution with the output of the torque converter. It is possible to measure the zero point and the peak value of the shaft holding torque for each of the magnetic poles facing each other.

According to the second aspect of the present invention, since the speed reducer is provided in the drive unit, the absolute value of the shaft holding torque can be checked almost simultaneously by the recording device. According to the third aspect of the present invention, the position of the measurement record can be confirmed by the reference position determination device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a shaft holding torque measuring device to which the present invention is applied.

FIG. 2 is an enlarged side view showing a main part of the coupling shown in FIG. 1;

FIG. 3 is an explanatory diagram showing measurement results when the present invention is implemented.

FIG. 4 is an explanatory diagram showing a measurement result when application of a main part of the present invention is excluded.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic pole, 2 ... Teeth or iron core, 3 ... Rotating shaft, 4 ... Rotating body, 5 ... Shaft holding torque, 6 ... Torque converter, 7 ... Coupling, 8 ... Drive power supply, 9 ... Drive motor, 10 ... Reduction gear, 11: disk, 12: photoelectric detector, 13: distortion amplifier, 14: pen recorder, 15: computer, 16 ...
Half coupling, 17 Holt hole, 18 Bolt, nut, 19 Zero point, 20 Peak value, 21 Reference position signal, 22 Reverse rotation torque output, 23 Drive unit, 24, 2
5, 26 ... axis.

Claims (4)

[Claims] An apparatus for measuring the torque of a rotating body having a magnetic pole structure on a fixed side and a rotating side and having a suction force for holding the rotating shaft stationary, wherein the rotating shaft is externally driven via a torque converter. A driving device that couples the rotating shaft and the shaft of the torque converter by a coupling that does not apply a restraining force when stationary, and a shaft holding torque for each opposed magnetic pole during one rotation of the rotating shaft. 1. A shaft holding torque measuring device comprising a recording device for recording zero and peak values of the shaft holding torque. 2. The shaft holding torque according to claim 1, wherein the driving device includes a speed reduction device for reducing the rotation speed of the torque converter shaft between the torque converter and the driving motor. measuring device. 3. The shaft holding torque according to claim 1, wherein a reference position discriminating device for discriminating a reference position for measurement is provided on the rotating shaft, and an output thereof is inputted to a recording device. measuring device. 4. A method of measuring a shaft holding torque of a rotating body having a suction force for holding a rotating shaft stationary with a magnetic pole configuration on a fixed side and a rotating side, wherein the rotating shaft is externally driven via a torque converter. The rotating shaft and the shaft of the torque converter are connected by a coupling that does not apply a restraining force when stationary, and the zero point and peak value of the shaft holding torque for each of the opposed magnetic poles during one rotation of the rotating shaft. The method for measuring a shaft holding torque, characterized by recording the following.