JPH08163841A - Eccentricity measuring apparatus and eccentricity correction apparatus for rotor - Google Patents

Abstract

PURPOSE: To facilitate measurement of the eccentricity of a rotor by measuring the eccentricity of a journal part and the rotor core of a rotor shaft, respectively, through first and second electric dial gauges and then calculating the eccentricity at a calculating section based on the measurements. CONSTITUTION: A first electric dial gauge 5 for measuring deflection of the surface of rotor core 1a in a rotor 1 is secured to the upper surface of a deflection observing base 4. Second electric dial gauges 5 for measuring deflection of a journal part 2a are fixed symmetrically to the opposite sides of the deflection observing base 4. A personal computer recorder 6 is disposed on the rear left side of a right rolling base 3 and connected with each electric dial gauge 5. When the outer circumference of a rotor core 1a is turned slowly by hand, measurement at each measuring point is delivered from each electric dial gauge 5 to the personal computer recorder 6 which automatically outputs the eccentricity with respect to the rotor core journal part 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentricity measuring device for measuring the bending of a rotor and an eccentricity correcting device for correcting the bending of the rotor.

[0002]

2. Description of the Related Art Among rotors of rotating electric machines, for example,
As in the case of a squirrel-cage induction motor, an assembly method by shrink fitting may be adopted in which an annular rotor core is heated and then inserted into a rotary shaft and fixed.

Further, the rotor core is shrink-fitted onto the rotating shaft, and then the rotor bars are inserted into the slots formed on the outer circumference. In these rotor bars, the portions protruding from both ends of the rotor core are short-circuit rings. Attached.

In such a rotary electric machine, the rotor core is inserted into the rotary shaft by shrink fitting, or the rotor shaft fitted to the outer circumference of the rotor core is heated by the brazing of both ends of the rotor bar and the short-circuit ring. It may bend slightly.

Therefore, an eccentricity measuring operation for measuring the bending of the rotor is performed in an intermediately assembled state before being assembled through the bearing of the fixed frame of the rotating electric machine. If a bending over the allowable value is detected by this eccentricity measurement work, in order to reduce the vibration generated by the rotation of the rotor and prevent the life of the bearing from being shortened, the rotor shrink-fitted to this rotor A method of slightly processing the outer circumference of the iron core is adopted.

FIG. 3 is a perspective view showing a conventional rotor eccentricity measuring device and eccentricity correcting method. In FIG. 3, a pair of T-shaped mounting blocks 9A as viewed from the front are mounted on the upper surface of the processing bed 1a of the large lathe 11 at predetermined intervals. The V blocks 12 are respectively placed in the centers of the upper surfaces of the mounting blocks 9A, and the rotor cores 1a are shrink-fitted in the central portions on the upper surfaces of the V grooves of these V blocks 12. The journal portions 2a on both sides of 2 are mounted.

The right end of the rotor 1 in FIG. 3 is held by a claw with respect to the central portion of the chuck portion 1b of the large lathe 11. On the other hand, between the pair of mounting blocks 9A, a small mounting block 9B is provided with respect to the processing bed 1a on the front side.
Is placed and fixed. The base end of the tool rest 7 is fixed to the upper surface of the mounting block 9B, and the cutting tool 7a is fixed to the tip of the tool rest 7.

Further, on the side surfaces of the left and right V blocks 12,
The base end of the dial gauge 10 is fixed, and the tips of the stylus of the dial gauge 10 are in contact with the outer peripheries of the left and right journals.

In the rotor eccentricity measuring device constructed as described above, when the bending of the rotor is measured, the chuck portion 1b of the large lathe 11 is slowly rotated manually to touch the dial gauges 10 on the left and right. Adjust the dial gauge 10 and the claws of the chuck 1b until the needle does not shake.

Next, the stylus of a plurality of dial gauges is applied to the center and both sides of the left and right journals 2 and the outer circumference of the rotor core 1a, and the claws 1b of the large lathe 11 are slowly rotated manually. The presence or absence of eccentricity of the rotary shaft 2 and the rotor core 1a and the value thereof are measured.

Conventionally, among rotors measured by the inventors by this method, for example, the outer diameter of the central portion of the rotor shaft is about 3 mm.
There was a rotor in which the rotor core was shrink-fitted to the rotor shaft of 00 mm, and the eccentric amount of the outer circumference of the rotor core was up to 1.5 mm.

In the rotor whose eccentricity is measured in this way, the outer periphery of the rotor core 1a is machined with the binder 7a,
The eccentricity of the outer circumference of the rotor core 1a is corrected so as to be a predetermined value or less. The amount of eccentricity measured by the dial gauges on both sides of the journal was less than the allowable value in the conventional rotating electrical machine, so there is no example of processing for correction, but it is recorded and saved as inspection data. .

[0013]

However, in the measuring method by the eccentricity measuring device for the rotor configured as described above, the dial gauge 1 fixed to the pair of V blocks 12 is used.
Also, reading the scales of the dial gauges attached to both sides of the journal portion 2a requires careful attention and skill and takes time.

That is, since the swing of the dial gauge 10 may be different depending on the tightening force of the chuck portion 1b, the fine adjustment of the dial gauge 10 and the chuck portion 1b must be repeated many times. Moreover, the large lathe cannot be used for cutting other products during this measurement.

Therefore, an object of the present invention is to obtain a rotor eccentricity measuring device and an eccentricity correcting device which can easily measure the amount of eccentricity of the rotor and correct the eccentric rotor bending. is there.

[0016]

According to a first aspect of the present invention, there is provided a rotor eccentricity measuring device comprising: a pair of bearing bases having a bearing portion on which a journal portion of a rotor shaft is mounted; A support that is provided parallel to the rotor shaft and is fixed with a first electric dial gauge for measuring the eccentric amount of the journal portion and a second electric dial gauge for measuring the eccentric amount of the rotor core of the rotor shaft. And a calculator for inputting measured values of the first dial gauge and the second dial gauge and outputting the amount of eccentricity of the rotor iron core with respect to the journal portion.

In the eccentricity correcting device for a rotor according to a second aspect of the present invention, a pair of bearing bases having a bearing portion on which a journal portion of the rotor shaft is mounted is provided on an upper portion, and the rotor shaft is provided on the rotor shaft. A support part provided in parallel with a first electric dial gauge for measuring the eccentric amount of the journal part and a second electric dial gauge for measuring the eccentric amount of the rotor core of the rotor shaft, A first drive unit that is connected to one end of the rotor shaft and drives the rotor shaft; and a second drive unit that is movably provided in parallel with the rotor shaft and that drives a binder that processes the outer circumference of the rotor core. The present invention is characterized by including a calculation unit that inputs measured values of the first dial gauge and the second dial gauge and outputs an eccentric amount of the rotor core with respect to the journal portion.

[0018]

According to the first aspect of the invention, the eccentricity of the rotor core with respect to the journal portion is calculated by the calculation unit in which the measured values are input from the first electric dial gauge and the second electric dial gauge. And output from this calculation unit.

According to the second aspect of the invention,
The amount of eccentricity of the rotor core with respect to the journal portion is corrected by the rotor core of the rotor shaft driven by the first drive unit and the cutting tool driven by the second drive unit for processing.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotor eccentricity measuring device and an eccentricity correcting device of the present invention will be described below with reference to the drawings. FIG.
[Fig. 3] is a perspective view showing an example of a rotor eccentricity measuring device of the present invention, and is a diagram corresponding to Fig. 3 shown in the prior art. The same elements as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, on a surface plate (not shown),
A pair of rolling bases 3 are erected at predetermined intervals, and the rolling bases 3
It is fixed to the surface plate via the base 3a at the lower end of the.
Mounting holes 3a1 for fixing the rolling base 3 to the surface plate with bolts are formed in advance at the four corners of the base 3a.

A trapezoidal guide groove 3a2 is previously formed in the center of the upper surface of these bases 3a. Both sides of the lower end of the substantially H-shaped moving frame 3b are loosely fitted in these guide grooves 3a2. A U-shaped guide groove is symmetrically formed at the upper end of the moving frame 3b with respect to the center of the inner facing surface.

In the guide groove, both sides of the upper portion of the substantially T-shaped bearing portion 3c are loosely fitted through a flat bearing (not shown) fixed to the bottom portion of the guide groove. A male screw is formed in the lower portion of the guide rod 3c1 vertically provided in the center of the bearing 3c, and is formed in the center of the moving frame 3b.
A handle (not shown) for rotation is attached to the lower end.

A pair of rollers 3c is provided above the bearing 3c.
2 are mounted symmetrically via a shaft (not shown), and the journal portion 2 of the rotor 1 is mounted on the upper surface of these rollers 3c2.
a is supported.

On the left side of the upper ends of the pair of rolling bases 3, a strip-shaped swinging base 4 is provided in parallel with the axis of the rotor 1 and horizontally. A contact-type electric dial gauge (hereinafter, simply referred to as dial gauge) 5 for measuring the deflection of the surface of the rotor core 1a of the rotor 1 is fixed to the upper surface of the deflection table 4 with respect to the intermediate portion. There is.

Similarly, dial gauges 5 for measuring the shake of the outer end of the journal portion 2a are symmetrically attached to the left and right ends of the swing table 4, and inside the dial gauges 5, the journal portion 5a is mounted. A dial gauge 5 for measuring the contact between the center of 2a and the inside of the journal 2a is attached.

On the other hand, a personal computer recorder 6 with a printer is installed behind the right rolling base 3 on the left side, and the connecting electric wires connected to the above-mentioned total 7 dial gauges 5 respectively have connectors on the right side. Connected through.

Further, a position detector (not shown) is attached to the central portion of the deflection table 4 at a position opposed to one side surface of the rotor core 1, and this position detection is performed on one side surface of the rotor core 1a. The device is provided with a protrusion for detecting the rotation angle of the rotor core, and the signal line of the position detector for detecting the position of the protrusion is also connected to the personal computer recorder 6 via a connector.

In the rotor eccentricity measuring apparatus having the above-described structure, the operator slowly rotates the outer circumference of the rotor core 1a by hand. The measured values at the respective measurement points measured by the dial gauges 5 by the rotation of the rotor 1 are input to the personal computer recorder 6, of which the journal portion 2a
The difference between the measured values of the dial gauges 5 excluding the dial gauge 5 for measuring the runout of the dial gauge 5 and the measured values of the dial gauges 5 for measuring the runout of the adjacent journal portion 2a is determined, and Recorded as runout.

Further, the difference between the measured value of the dial gauge 5 for measuring the touch of the central portion of the rotor core 1a and the average value of the measured values of the dial gauge for measuring the touch of the left and right journal portions 2a is calculated. , Is recorded as the shake value of the measurement point.

Further, the rotation angle of the rotor 1 is also stored in the personal computer recorder 6 by the signal input from the position detector which is activated by the approach of the protrusion projecting on the side surface of the rotor core. It

The above-mentioned measured values of the dial gauges 5 and the measurement results of the rotation angle detector input to the personal computer recorder 6 are output from the printer of the personal computer recorder 6 as shown in FIG.

In the rotor eccentricity measuring device constructed as described above, it is not necessary to adjust each dial gauge 5 for measuring the journal portion 2a, so that even an unskilled person may not be able to adjust the eccentricity of each portion of the rotor. The amount can be easily measured. Moreover, since it is not necessary to use a high-class large lathe for measuring the eccentricity of the rotor, it is possible to eliminate the possibility of disturbing the manufacturing process of other processed parts. Further, since the lathe can be straightened only to the rotor that needs to be straightened, it is possible to omit the conventional step of transporting all the rotors from the assembly plant to the processing plant.

Next, FIG. 2 is a perspective view showing an example of the rotor eccentricity correcting device according to the second aspect of the present invention and is a view corresponding to FIG. Therefore, the same elements as those in FIG.

2 is different from the rotor eccentricity measuring device shown in FIG. 1 in that the width of the base 3d for guiding the lower right end of the moving frame 3b is wider than that of the base 3a shown in FIG. As shown in FIG. 2, the base 3d is common to the left and right moving frames 3b.

On the upper surface of the base 3d, a wide groove 3d2 is formed in parallel with the right side of the trapezoidal groove in which the lower right end of the moving frame 3b is guided. Bearing pedestals 3f are attached to the upper portions on both sides of the groove 3d2, and both ends of the ball screw 3g are supported by these bearing pedestals 3f.

A mounting block 9 having a substantially convex shape is formed in the groove 3d2.
A convex portion formed at the lower end of C is fitted, and a nut (not shown) with which the ball screw 3g is screwed is incorporated inside the mounting block 9C. A drive mechanism for moving the tool back and forth is built in the mounting block 9C. The base end of a tool rest 7, which is the same as the tool rest 7 shown in FIG. 3, is fixed to the upper surface of the mounting block 9C.

A drive device 8 is connected to the left end of the rotor shaft 2 via a flexible joint (not shown). A drive motor and a speed reducer are housed inside the drive device 8, and a flexible joint is attached to the end of the output shaft of the speed reducer.

On the other hand, on the right side of the rolling base 3A, the control device 10
Is installed. This control device 10 includes a mounting block 9
A drive motor (not shown) connected to the end of the ball screw 3g passing through C is turned on / off via a switch, and an electric motor of a drive mechanism (not shown) incorporated in the mounting block 9C is driven. .

Therefore, in the eccentricity correcting device constructed as described above, first, the driving device 8 is driven to drive the rotor 1
Is rotated at a low constant speed, and the eccentric amount of each part is measured by each dial gauge 5.

The operator confirms the eccentricity amount of each part by the data output from the personal computer recorder 6. If the eccentricity amount more than the allowable value is output, the controller 10 controls the ball screw 3g The drive motor connected to the end is driven to move the mounting block 9C to a predetermined range.

Along with the movement of the mounting block 9C, the rotor 1 is rotated by the drive unit 8 and the surface of the rotor core 1a is processed by the cutting tool 7a to correct the eccentricity. Therefore, by installing this eccentricity correction device for the rotor at the assembly location of the rotating electric machine, it is possible to omit the step of transferring to the lathe of the cutting factory.

[0043]

As described above, according to the invention of claim 1,
The bearing portion on which the journal portion of the rotor shaft is placed is provided in parallel with the pair of bearing bases provided on the upper portion,
First electric dial gauge for measuring the amount of eccentricity of the journal part and second for measuring the amount of eccentricity of the rotor core of the rotor shaft
By including a support unit to which the electric dial gauge of is fixed, and a calculation unit that inputs the measured values of the first dial gauge and the second dial gauge and outputs the eccentric amount of the rotor core with respect to the journal unit, The amount of eccentricity of the rotor iron core with respect to the journal portion can be adjusted according to the first electric dial gauge and the second electric dial gauge.
Since the measurement value is automatically output from the electric dial gauge in which the measurement value is input, it is possible to obtain the rotor eccentricity measuring device that can easily measure the eccentricity amount of the rotor.

According to the second aspect of the present invention, the bearing portion on which the journal portion of the rotor shaft is mounted is provided parallel to the rotor shaft, and the pair of bearing bases are provided on the upper portion. A support part to which a first electric dial gauge for measuring the eccentric amount of the journal part and a second electric dial gauge for measuring the eccentric amount of the rotor core of the rotor shaft are fixed, and one end of the rotor shaft. A first drive unit connected to drive the rotor shaft;
A second drive unit that is provided so as to be movable parallel to the rotor shaft and that drives a binder that processes the outer circumference of the rotor core; and measurement values of the first dial gauge and the second dial gauge are input to the journal unit. By providing the calculation unit that outputs the eccentricity amount of the rotor core, the eccentricity amount of the rotor core with respect to the journal unit is driven by the rotor core of the rotor shaft driven by the first drive unit and the second drive unit. Since it is corrected by the bite to be processed, it is possible to obtain the rotor eccentricity correction device which can easily correct the eccentricity of the rotor.

[Brief description of drawings]

1 is a perspective view showing an embodiment of an eccentricity measuring device for a rotor according to claim 1;

FIG. 2 is a perspective view showing an embodiment of the rotor eccentricity measuring device according to claim 2;

FIG. 3 is a perspective view showing an example of a conventional rotor eccentricity measuring device and an eccentricity correcting device.

[Explanation of symbols]

1 ... Rotor, 1a ... Rotor core, 2 ... Rotor shaft, 2a ...
Journal part, 3, 3A ... Rolling base, 3a, 3d ... Base, 3b ... Moving frame, 3c ... Bearing part, 4 ... Deflection stand, 5 ...
Contact type electric dial gauge, 6 ... PC recorder, 7
... turret, 7a ... bite, 8 ... drive device, 9C ... mounting block, 10 ... control device.

Claims (2)

[Claims] 1. A pair of bearing pedestals having a bearing part on which a journal part of a rotor shaft is mounted, and a pair of bearing bases provided in parallel with the rotor shaft for measuring an eccentric amount of the journal part. Of the first dial gauge and the second dial gauge, the support portion to which the second electric dial gauge for measuring the eccentric amount of the rotor iron core of the rotor shaft is fixed; An eccentricity measuring device for a rotor, comprising: a calculation unit that receives a measured value and outputs an eccentric amount of the rotor iron core with respect to the journal unit. 2. A pair of bearing pedestals having a bearing portion on which a journal portion of a rotor shaft is mounted, and a pair of bearing pedestals provided parallel to the rotor shaft for measuring the amount of eccentricity of the journal portion. The electric dial gauge of No. 1 and a support portion to which a second electric dial gauge for measuring the eccentricity of the rotor core of the rotor shaft is fixed, and the rotor shaft connected to one end of the rotor shaft. A first drive unit for driving, a second drive unit that is movably provided in parallel with the rotor shaft and that drives a cutting tool that processes the outer circumference of the rotor iron core, the first dial gauge, and the first dial gauge. An eccentricity measuring device for a rotor, comprising: a calculation unit which receives a measured value of a dial gauge and outputs an eccentricity amount of the rotor iron core with respect to the journal unit.