JPH10239040A - Gap measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the measurement of a gap, and eliminate the dispersion due to individuals for obtaining high reliability by making a flexible mechanism of a gap-measuring sensor of remote operation which is arranged to a plurality of measuring points. SOLUTION: The measuring output of a gap measuring sensor 2 is sent to a measuring monitor 10 through a transmitting system that is wired inside a flexible arm 1. This measuring monitor 10 displays in monitor the change in the electric resistance measured by the gap measuring sensor 2. While, on the other hand, a fiberscope 11 as an optical system having an image pickup action for confirming the arrangement position of the gap measuring sensor 2 is detachably fitted to the flexible arm 1 by means of fitting members 12. The fiberscope 11 has a flexible structure and transmits the pickup image in the vicinity of the gap measuring sensor 2, and a monitor 13 for confirming the position is connected to the other end thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a rotating electric machine.
For quality control in adjustment, for example, the present invention relates to a gap measuring device that measures a gap between a structural rotor and a stator.

[0002]

2. Description of the Related Art In a rotary electric machine, for example, an induction motor, there is a gap of several millimeters between a structural rotor and a stator. This gap is an important value for ensuring the performance of the induction motor, and it is necessary to adjust the assembly within a specified tolerance.

[0003] Also, at the time of inspection of the induction motor, the gap value is an important control value for maintenance, so that it is necessary to be able to easily measure it at any time. For this reason, when adjusting the gap, a clearance gauge is inserted from the axial direction of the rotor into the gap between the rotor and the stator to measure the gap.

[0004]

However, the above-described gap measurement has the following problems. (a) It is necessary to observe the gap between the rotor and the stator from the axial direction after assembly, but due to the structure of the induction motor,
Since the cooling fan exists in the space before the clearance gauge is inserted into the gap, the visual field is obstructed, and the insertion position of the clearance gauge may not be clearly confirmed. (b) In the rotor of an induction motor, since there is an end ring or retaining ring whose diameter is larger than the rotor surface to reach the rotor surface for gap measurement, when inserting the clearance gauge, Must find the rotor surface. (c) For such reasons (a) and (b), skill is required to accurately perform the gap, and the data of the gap measurement varies depending on the person. Therefore, an object of the present invention is to provide a highly reliable gap measuring apparatus that simplifies gap measurement, eliminates data variation between persons, and provides a highly reliable gap measuring apparatus.

[0005]

According to the present invention, there is provided a gap measuring sensor for measuring a distance between a gap between two measuring points, and a flexible arrangement for remotely arranging the gap measuring sensor at the two measuring points. And a mechanism for measuring the gap.

According to a second aspect of the present invention, in the gap measuring apparatus according to the first aspect, an optical system having an image forming function for confirming an arrangement position of the gap measuring sensor is detachably provided. According to claim 3, in the gap measuring device according to claim 2, the optical system is a fiberscope.

According to a fourth aspect, in the gap measuring device according to the first aspect, the gap measuring sensor has a function of outputting a distance between two measuring points as an electric resistance.
According to a fifth aspect of the present invention, in the gap measuring device according to the first aspect, the gap measuring sensor detects a distance between two measuring points as a pressure change of the fluid when the fluid flows between the measuring points.

According to a sixth aspect, in the gap measuring device according to the first aspect, the gap measuring sensor has a function of outputting a distance between two measuring points as a voltage change.
According to claim 7, in the gap measuring device according to claim 1, the gap measuring sensor has a function of outputting a distance between two measurement points as a change in metal strain.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of the gap measuring device. A gap measuring sensor 2 is attached to the tip of the flexible arm 1. The flexible arm 1 is provided with an operation handle 3. By operating the operation handle 3, the gap measurement sensor 2 attached to the distal end of the flexible arm 1 can be moved between arbitrary measurement points, for example, a rotor on the structure of an induction motor. And a gap of several millimeters between the stator and the stator.

The gap measuring sensor 2 measures the distance between a gap of several millimeters between a rotor and a stator on the structure of an induction motor, for example, and FIG. 2 is a block diagram showing a specific example thereof. It is.

When the gap between the rotor 4 and the stator 5 of the induction motor is to be measured, two moving bodies 6, 7 formed in a wedge shape are arranged between the rotor 4 and the stator 5. ing.

The moving bodies 6 and 7 are mutually connected to the respective inclined surfaces 6.
For example, one moving body 6 is fixed, and the other moving body 7 is slidably moved.

Each of the moving bodies 6 and 7 is formed of an electric conductor. Of these, an insulating layer 8 is formed on a surface of the moving body 6 other than the inclined surface 6a, and a portion that comes into contact with the stator 5 is provided. And insulation.

An ohmmeter 9 is connected between the moving bodies 6 and 7, and a change in the electric resistance of the contact surface when the area of the contact surface with the moving bodies 6 and 7 changes. It is to be measured.

Accordingly, the gap measuring sensor 2 determines the height d when the moving bodies 6 and 7 slide with respect to each other, that is, the gap between the rotor 4 and the stator 5 to the contact surface between the moving bodies 6 and 7. The measurement output is made as a change in electric resistance.

The measurement output of the gap measuring sensor 2 is:
It is sent to the measurement monitor 10 through a transmission system wired inside the flexible arm 1. The measurement monitor 10 has a function of displaying a change in the electric resistance measured by the gap measurement sensor 2 on a monitor, or displaying the change in the electric resistance converted into a gap.

On the other hand, the flexible arm 1 is provided with, for example, a fiberscope 11 as an optical system having an image forming function for confirming the arrangement position of the gap measuring sensor 2 so as to be detachable by a mounting bracket 12.

The fiberscope 11 has a flexible structure, and captures and transmits an image near the gap measuring sensor 2. A monitor 13 for position confirmation is connected to the other end.

With such a configuration, the operation handle 3
, The flexible arm 1 moves freely inside a complicated internal structure such as an induction motor, for example, between the gap between the rotor 4 and the stator 5.

At this time, the moving position of the gap measuring sensor 2 attached to the distal end of the flexible arm 1 is photographed by the fiber scope 11 and transmitted to the position confirming monitor 13.

Thus, the gap measuring sensor 2 can watch the image displayed on the position confirmation monitor 13 while watching the image.
It is moved by operating the operation handle 3. Since the flexible arm 1 and the fiberscope 11 having the same flexible structure are used for moving the gap measuring sensor 2, the gap measuring sensor 2 can be freely moved in the induction motor.

The gap measuring sensor 2 reaches the gap between the rotor 4 and the stator 5 of the induction motor by the movement of the flexible arm 1 as described above. In this gap measuring sensor 2, as shown in FIG. 2, moving bodies 6, 7 are inserted between the rotor 4 and the stator 5, and the moving bodies 6, 7 slide and move with each other, so that the height d thereof is reduced. Change.

When these moving bodies 6 and 7 are caught between the rotor 4 and the stator 5 and moved until they stop, their height d
Is the same as the value of the gap d between the rotor 4 and the stator 5. At this time, with the movement of the moving bodies 6 and 7, the area of the contact surface between the moving bodies 6 and 7 changes, and the electrical resistance of the contact surface changes. This electric resistance is measured by a resistance meter 9 and sent to a measurement monitor 10 through a transmission system wired inside the flexible arm 1.

The measurement monitor 10 displays a change in the electric resistance measured by the gap measuring sensor 2 on a monitor or converts the change in the electric resistance into a gap d and displays it.

As described above, in the first embodiment, the gap measuring sensor 2 is attached to the distal end of the flexible arm 1 and the fiberscope 11 is attached. The gap between the measurement points, for example, between the rotor 4 and the stator 5 on the structure of the induction motor is arranged in a gap of several millimeters, so that the gap between the rotor 4 and the stator 5 of the induction motor is measured. There is a cooling fan or the like in the space before the sensor 2 is inserted. However, the field of view is not blocked by the cooling fan by the fiber scope 11, and the rotor of the induction motor reaches the surface of the rotor 4 for gap measurement. End ring or retaining ring with a diameter larger than the surface of the rotor 4 by The insertion position of the capacitors 2 can see clearly the can accurately gap measurement.

The gap measurement can be accurately performed with high reliability without requiring any skill to accurately perform the gap and without causing variation in the data of the gap measurement by a person. (2) Next, a second embodiment of the present invention will be described.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 is a configuration diagram of a gap measuring sensor used in the gap measuring device. This gap measuring sensor 2
Numeral 0 replaces the gap measuring sensor 2 shown in FIG.

The gap measuring sensor 20 determines the gap D between two measurement points, for example, between the rotor 4 and the stator 5 of the induction motor, and the fluid between the rotor 4 and the stator 5, for example, It has a function of detecting as a pressure change P of the inserted air when air is introduced.

Specifically, the gap measuring sensor 20 comprises a moving body 22 with an orifice having a nozzle 21 for air outflow formed at the tip thereof.
2, a pump 23 is inserted through the flexible arm 1.
Air is introduced from the air. The nozzle 21 is formed in a diameter phi _d.

The pressure gauge 24 measures a change in the pressure of the air flowing into the moving body 22 with an orifice, and sends a measurement signal to a measurement monitor 25 through a transmission system wired inside the flexible arm 1. Have been.

The measurement monitor 25 has a function of displaying a change in the pressure of the air measured by the pressure gauge 24 on a monitor, or displaying the change in the pressure in terms of a gap.

With such a configuration, the operation handle 3
, The flexible arm 1 moves freely inside a complicated internal structure such as an induction motor, for example, between the gap between the rotor 4 and the stator 5.

At this time, the moving position of the gap measuring sensor 20 attached to the distal end of the flexible arm 1 is photographed by the fiber scope 11 and transmitted to the position confirming monitor 13.

As a result, the gap measuring sensor 20
The user moves by operating the operation handle 3 while watching the image displayed on the position confirmation monitor 13. The gap measuring sensor 20 reaches the gap between the rotor 4 and the stator 5 of the induction motor by such a movement of the flexible arm 1.

As shown in FIG. 3, the gap measuring sensor 20 is inserted between the rotor 4 and the stator 5 with the orifice-equipped moving body 22 as the stator 5 side. Air is supplied by the operation of the pump 23, and the air is ejected from the nozzle 21.

At this time, the air pressure supplied to the inside of the orifice-equipped moving body 22 varies with the distance h between the nozzle 21 and the rotor 4, that is, the air pressure which varies in relation to the gap D between the rotor 4 and the stator 5. It changes according to the resistance.

The pressure gauge 24 measures the air pressure supplied to the inside of the movable body 22 with an orifice, and sends a measurement signal to a measurement monitor 25 through a transmission system wired inside the flexible arm 1.

The measurement monitor 25 displays the pressure change of the air measured by the pressure gauge 24 on a monitor or converts the pressure change into a gap and displays it. As described above, according to the second embodiment, the gap measurement sensor 2
0 is measured as a change in air pressure supplied to the inside of the orifice-equipped moving body 22, for example, the rotor 4 and the stator 5
And the gap D between the rotor 4 and the stator 5 of the induction motor is measured in the same manner as in the first embodiment.
There is a cooling fan or the like in the space before the gap measurement sensor 2 is inserted into the gap, but the field of view is not obstructed by the cooling fan by the fiber scope 11, and in the rotor of the induction motor, the rotor for gap measurement is used. 4
There is an end ring or holding ring whose diameter is larger than the surface of the rotor 4 before reaching the surface of the rotor 4. However, the insertion position of the gap measurement sensor 2 can be clearly confirmed without being hindered by these, and accurate gap measurement can be performed. it can.

The gap measurement can be accurately performed with high reliability without requiring any skill to accurately perform the gap and without causing variation in the data of the gap measurement by a person. (3) Next, a third embodiment of the present invention will be described.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 4A and 4B are configuration diagrams of a gap measuring sensor used in the gap measuring device. FIG. 4A is a configuration diagram as viewed from above, and FIG. 4B is a configuration diagram as viewed from a side. This gap measuring sensor 30 is used in place of the gap measuring sensor 2 shown in FIG.

Specifically, the gap measuring sensor 30 includes a fixed arm 31 on which a hinge 32 is mounted.
A movable arm 33 is provided rotatably about the hinge 32 via the. The movable arm 33
Are provided on the hinge 32 at an angle with respect to the hinge 32 substantially at the center.

By the rotation of the movable arm 33, the tip 33a of the movable arm 33 moves in the vertical direction (a). The other end 33 b of the movable arm 33 is connected to a piezoelectric element 35 via a spring 34. The spring 34 has a biasing force toward the movable arm 33 (in the direction of arrow B), and has a function of applying pressure applied to the piezoelectric element 34 when the movable arm 33 rotates.

The piezoelectric element 34 is fixed on the fixed arm 31, receives a pressure applied when the movable arm 33 rotates through a spring 34, and sends a voltage corresponding to the applied pressure to the displacement meter 36. Has become.

The displacement meter 36 has a function of converting a voltage generated in the piezoelectric element 35 into a displacement amount, for example, a gap between the rotor 4 and the stator 5 of the induction motor. 10.

The other end of the movable arm 33 is provided with a wire 37. The wire 37 is led out through the flexible arm 1 toward the measurement monitor 10, and the movable arm 33 rotates around the hinge 32 by, for example, pulling the wire 37.

With such a configuration, the operation handle 3
, The flexible arm 1 moves freely inside a complicated internal structure such as an induction motor, for example, between the gap between the rotor 4 and the stator 5.

At this time, the moving position of the gap measuring sensor 30 attached to the distal end of the flexible arm 1 is photographed by the fiberscope 11 and transmitted to the position confirming monitor 13.

As a result, the gap measuring sensor 30
The user moves by operating the operation handle 3 while watching the image displayed on the position confirmation monitor 13. The gap measurement sensor 30 reaches the gap between the rotor 4 and the stator 5 of the induction motor by such movement of the flexible arm 1.

As shown in FIG. 4, the gap measuring sensor 30 is inserted between the rotor 4 and the stator 5 with the fixed arm 31 facing the stator 5, and in this state, the wire 37 is moved in the direction of the arrow (c). Is drawn to.

By the pulling operation of the wire 37, the movable arm 33 rotates about the hinge 32, and its tip 33a moves in the vertical direction (a). This movable arm 3
The tip 33 a contacts the rotor 4 due to the vertical movement of 3.

At this time, the rotation of the movable arm 33 applies a pressure to the piezoelectric element 35 via the spring 34 in accordance with the amount of vertical movement of the movable arm 33. This piezoelectric element 34
The spring 3 applies the pressure applied when the movable arm 33 rotates.
4, and sends a voltage corresponding to the applied pressure to the displacement meter 36.

The displacement meter 36 converts the voltage generated in the piezoelectric element 35 into a displacement amount, that is, a gap between the rotor 4 and the stator 5 of the induction motor, and sends it to the measurement monitor 10. As described above, according to the third embodiment, the gap measuring sensor 30 is detected as a voltage applied to the piezoelectric element 35 according to the amount of vertical movement of the movable arm 33, and this voltage is converted into a displacement. Therefore, it goes without saying that the same effect as that of the first embodiment can be obtained. (4) Next, a fourth embodiment of the present invention will be described.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a configuration diagram of a gap measuring sensor used in the gap measuring device. This gap measuring sensor 4
Numeral 0 replaces the gap measuring sensor 2 shown in FIG.

Specifically, the gap measuring sensor 40 outputs a gap between two measuring points, for example, a gap between the rotor 4 and the stator 5 of the induction motor as a change in metal strain.
Specifically, a curved leaf spring 42 is provided at the tip of the moving body 41, and a strain gauge 43 is attached to one surface (the inner surface of the curve) of the leaf spring 42.

The leaf spring 42 has a biasing force in the direction of the arrow (d), and the free state where no pressure is applied is indicated by a dotted line. In the strain gauge 43,
A displacement gauge 44 is connected, and the displacement gauge 44 detects a strain generated in the strain gauge 43 to detect a displacement amount. The displacement output of the displacement meter 44 is sent to and displayed on the measurement monitor 10.

With such a configuration, the operation handle 3
, The flexible arm 1 moves freely inside a complicated internal structure such as an induction motor, for example, between the gap between the rotor 4 and the stator 5.

At this time, the moving position of the gap measuring sensor 40 attached to the distal end of the flexible arm 1 is photographed by the fiberscope 11 and transmitted to the position confirmation monitor 13.

As a result, the gap measuring sensor 40
The user moves by operating the operation handle 3 while watching the image displayed on the position confirmation monitor 13. The gap measuring sensor 40 reaches the gap between the rotor 4 and the stator 5 of the induction motor by such a movement of the flexible arm 1.

The gap measuring sensor 40 is inserted between the rotor 4 and the stator 5 with the moving body 41 facing the stator 5 as shown in FIG. This gap measuring sensor 40
, The leaf spring 42 is deformed according to the gap between the rotor 4 and the stator 5, and the strain gauge 43 is distorted according to the deformation of the leaf spring 4.

The strain generated in the strain gauge 43 is detected by the displacement gauge 44 and converted into the displacement of the leaf spring 4 and output. The displacement output of the displacement meter 44 is sent to the measurement monitor 10 and displayed.

As described above, according to the fourth embodiment, the gap measuring sensor 40 detects a distortion corresponding to the deformation of the leaf spring 42 and converts this distortion into a displacement. Needless to say, the same effect as the effect of the first embodiment is obtained.

The present invention is not limited to the first to fourth embodiments, but may be modified as follows.
For example, the measurement target is not limited to the measurement of the gap between the rotor 4 and the stator 5 of the induction motor, and can be applied to the measurement of each gap in a mechanism having a complicated structure.

[0063]

As described above, according to the present invention, it is possible to provide a highly reliable gap measuring apparatus which simplifies gap measurement, eliminates variations in data caused by humans.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a gap measuring device according to the present invention.

FIG. 2 is a specific configuration diagram of a gap measurement sensor using electric resistance measurement in the same device.

FIG. 3 is a configuration diagram showing a second embodiment of the gap measuring device according to the present invention.

FIG. 4 is a configuration diagram showing a third embodiment of the gap measuring device according to the present invention.

FIG. 5 is a configuration diagram showing a fourth embodiment of the gap measuring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flexible arm, 2, 20, 30, 40 ... Gap measurement sensor, 3 ... Operation handle, 4 ... Rotor, 5 ... Stator, 6, 7 ... Moving body, 8 ... Insulating layer, 9 ... Resistance meter, 10 , 25: Monitor for measurement, 11: Fiberscope, 13: Monitor for position confirmation, 21: Nozzle, 22: Moving body with orifice, 23: Pump, 24: Pressure gauge, 31: Fixed arm, 32: Hinge, 33 ... movable arm, 35: piezoelectric element, 36: displacement gauge, 37: wire, 41: moving body, 42: leaf spring, 43: strain gauge, 44: displacement gauge.

Claims (7)

[Claims] 1. A gap measuring sensor for measuring a distance between a gap between two measuring points, and a flexible mechanism for remotely arranging the gap measuring sensor at the two measuring points. Gap measuring device. 2. The gap measuring apparatus according to claim 1, wherein an optical system having an image forming function for confirming an arrangement position of the gap measuring sensor is detachably provided. 3. The gap measuring device according to claim 2, wherein said optical system is a fiberscope. 4. The gap measuring device according to claim 1, wherein the gap measuring sensor has a function of outputting a distance between the two measuring points as an electric resistance. 5. The gap measuring sensor according to claim 1, wherein the gap measuring sensor detects a distance between the two measuring points as a pressure change of the fluid when the fluid flows between the measuring points. Gap measuring device. 6. The gap measuring device according to claim 1, wherein the gap measuring sensor has a function of outputting a distance between the two measurement points as a voltage change. 7. The gap measuring apparatus according to claim 1, wherein the gap measuring sensor has a function of outputting a distance between the two measuring points as a change in metal strain.