Roundness measuring structure of rotor annular magnet yoke

Abstract

The utility model provides a rotor annular magnet yoke roundness measuring structure, which comprises an annular magnet yoke, buttresses arranged below the annular magnet yoke and used for supporting the annular magnet yoke, supports arranged on two sides of the annular magnet yoke, a horizontal beam arranged on the supports, a positioner fixed on the horizontal beam, and a conductive steel wire wound on the surface of the positioner. The conductive steel wire is electrically connected with a battery pack, a heavy ball penetrating through the center of the annular magnet yoke is fixed to the lower end of the conductive steel wire, a micrometer is arranged between the inner surface of the annular magnet yoke and the conductive steel wire, and the outer surface of the annular magnet yoke is electrically connected with a resistor and a comparison module. The distance between each part of the inner wall of the annular magnet yoke and the conductive steel wire is measured through the micrometer, and the roundness and the center deviation are obtained after calculation; the structure is simple; the heavy ball is soaked in the insulating oil, and the conductive steel wire can be stably fixed without contact interference of the micrometer and is insulated from a grounding point; and whether the micrometer is contacted with the conductive steel wire or not is judged accurately and reliably by adopting the light-emitting diode.

Description

Technical Field

[0001] The utility model relates to the technical field of annular magnetic yoke roundness measurement, in particular to a rotor annular magnetic yoke roundness measurement structure. Background Art

[0002] In recent years, high-speed hydro-turbine generators with speeds greater than 375r / min have mostly adopted integral annular yokes to replace the original laminated yokes. Not only does it have good integrity, it also greatly saves the installation cycle, and has become the preferred structure for rotor yokes. The annular yoke is a rotating component. If eccentricity occurs during manufacturing and installation, it will seriously affect the performance of the generator, and even cause damage to the generator in severe cases. Due to the lack of positioning of the laminated yoke, the roundness and center positioning of the annular integral yoke need to be re-measured on site to understand whether eccentricity occurs during manufacturing and transportation. At the same time, it can provide data support for the setting of dynamic balancing blocks and rotor installation. The traditional method of measuring the roundness of annular devices mainly uses a circular measuring frame. The circular measuring frame has high requirements for fixing accuracy and is relatively complicated in layout and positioning. In addition, the inner diameter of the high-speed yoke is usually small, and it is difficult to directly purchase a circular measuring frame of this size on the market. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a rotor annular yoke roundness measurement structure, which can solve the problem that the traditional method of measuring the roundness of annular devices has high fixing accuracy requirements and is difficult to position.

[0004] To this end, the utility model adopts the following technical solutions:

[0005] A rotor annular yoke roundness measurement structure comprises an annular yoke, a pier for supporting the annular yoke is provided below the annular yoke, brackets are provided on both sides of the annular yoke, a horizontal beam is placed on the bracket, a positioner is fixed on the horizontal beam, a conductive steel wire is wound around the surface of the positioner, the conductive steel wire is electrically connected to a battery pack, a heavy ball passing through the center of the annular yoke is fixed to the lower end of the conductive steel wire, a micrometer is provided between the inner surface of the annular yoke and the conductive steel wire, and a resistor and a comparison module are electrically connected to the outer surface of the annular yoke.

[0006] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0007] The comparison module includes a power supply, a first resistor, a second resistor, a third resistor, a light-emitting diode and an operational amplifier. The input signal end of the comparison module is connected to the non-inverting input end of the operational amplifier, one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the inverting input end of the operational amplifier, one end of the second resistor is grounded, the other end of the third resistor is connected to the non-inverting input end of the operational amplifier, one end of the third resistor is grounded, the other end of the third resistor is connected to the output end of the operational amplifier, and a light-emitting diode is connected in series between the output end of the operational amplifier and the third resistor.

[0008] An insulating oil barrel is arranged below the heavy ball, the insulating oil barrel is filled with insulating oil, and the heavy ball is immersed in the insulating oil.

[0009] The surface of the annular yoke is provided with X-axis scale lines and Y-axis scale lines, and the surface of the annular yoke is provided with a first positioning steel wire and a second positioning steel wire passing through the X-axis scale lines respectively, the intersection of the first positioning steel wire and the second positioning steel wire is the design center of the annular yoke, and the conductive steel wire passes through the design center of the annular yoke.

[0010] The inner surface of the annular magnetic yoke is provided with a plurality of equally divided measuring points, and the micrometer can measure the distance between each measuring point and the conductive steel wire.

[0011] The voltage of the battery pack is set to Uo, the Uo range is 8V~12V, and the voltage range of the power supply is 0.9Uo~0.95Uo.

[0012] The value range of the first resistor and the second resistor is 1 kΩ~10 kΩ, and the value range of the third resistor is 10Ω~20Ω.

[0013] Compared with the prior art, the utility model has the following advantages and beneficial effects: the distance between each point of the inner wall of the annular magnetic yoke and the conductive steel wire is measured by a micrometer, and the roundness and center deviation are obtained after calculation, and the structure is simple; the heavy ball is immersed in insulating oil, the conductive steel wire can be firmly fixed, is not disturbed by the contact of the micrometer, and is insulated from the grounding point; the light-emitting diode is used to determine whether the micrometer is in contact with the conductive steel wire, which is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 For comparison module schematics.

[0016] Figure 3 Schematic diagram of the measurement point distribution of the annular yoke. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] The utility model provides a rotor annular yoke roundness measuring structure, comprising an annular yoke 5, a pier 1 for supporting the annular yoke 5 is provided below the annular yoke 5, brackets 2 are provided on both sides of the annular yoke 5, a horizontal beam 3 is placed on the bracket 2, a positioner 4 is fixed on the horizontal beam 3, a conductive steel wire 7 is wound around the surface of the positioner 4, the conductive steel wire 7 is electrically connected to a battery pack 10, a heavy ball 8 passing through the center of the annular yoke is fixed to the lower end of the conductive steel wire 7, a micrometer 6 is provided between the inner surface of the annular yoke 5 and the conductive steel wire 7, and a resistor 11 and a comparison module 12 are electrically connected to the outer surface of the annular yoke 5.

[0020] The comparison module 12 includes a power supply U1a, a first resistor R2, a second resistor R3, a third resistor R4, a light-emitting diode D2 and an operational amplifier D1. The input signal terminal Vin of the comparison module 12 is connected to the non-inverting input terminal of the operational amplifier D1, one end of the first resistor R2 is connected to the power supply U1a, the other end of the first resistor R2 is connected to the inverting input terminal of the operational amplifier D1, one end of the second resistor R3 is grounded, the other end of the third resistor R3 is connected to the non-inverting input terminal of the operational amplifier D1, one end of the third resistor R4 is grounded, the other end of the third resistor R4 is connected to the output terminal of the operational amplifier D1, and a light-emitting diode D2 is also connected in series between the output terminal of the operational amplifier D1 and the third resistor R4.

[0021] When the voltage value of the input signal terminal Vin is less than the power supply U1a, the light-emitting diode D2 is not turned on and is in an off state. When the voltage value of the input signal terminal Vin is greater than the power supply U1a, the light-emitting diode D2 is turned on and emits light.

[0022] An insulating oil barrel 9 is provided below the heavy ball 8. The insulating oil barrel 9 is filled with insulating oil, and the heavy ball 8 is immersed in the insulating oil.

[0023] The surface of the annular yoke 5 is provided with X-axis scale lines and Y-axis scale lines. The surface of the annular yoke 5 is provided with a first positioning steel wire 14 and a second positioning steel wire 15 passing through the X-axis scale lines respectively. The intersection of the first positioning steel wire 14 and the second positioning steel wire 15 is the design center of the annular yoke 5, and the conductive steel wire 7 passes through the design center of the annular yoke 5.

[0024] The inner surface of the annular magnetic yoke 5 is provided with a plurality of equally divided measuring points 16 , and the micrometer 6 can measure the distance between each measuring point 16 and the conductive steel wire 7 .

[0025] In this embodiment, 16 measuring points 16 are provided on the inner surface of the annular magnetic yoke.

[0026] The voltage of the battery pack 10 is set to Uo, the Uo range is 8V~12V, and the voltage range of the power supply Ula is 0.9Uo~0.95Uo.

[0027] The value range of the first resistor R2 and the second resistor R3 is 1 kΩ~10 kΩ, and the value range of the third resistor R4 is 10Ω~20Ω.

[0028] The utility model provides a rotor annular yoke roundness measurement structure, and the specific roundness measurement steps are as follows:

[0029] 1) Pull out the first positioning steel wire 14 and the second positioning steel wire 15 on the X-axis and Y-axis engraved lines of the annular magnetic yoke 5 respectively, and find the intersection point, which is the design center of the annular magnetic yoke 5;

[0030] 2) Adjust the position of the positioner 4 and the heavy ball 8 so that the conductive steel wire 7 hanging the heavy ball 8 passes through the design center of the annular magnetic yoke 5;

[0031] 3) Use an electric wire to connect the conductive steel wire 7 on the positioner 4 to the positive electrode of the battery pack 10;

[0032] 4) On the inner surface of the annular yoke 5, 16 measuring points 16 are equally divided from +Y;

[0033] 5) Place the tail end of the micrometer 6 in contact with the measuring point, shake the head of the micrometer 6, and when the head of the micrometer 6 just touches the conductive steel wire 7, the light-emitting diode D2 lights up. At this time, read the scale of the micrometer 6, which is the radius of the annular magnetic yoke 5 at the measuring point 16;

[0034] 6) Repeat the distance measurement of 16 measuring points, denoted as Ri, i=1,2,3…16.

[0035] 7) The difference between the maximum radius and the minimum radius measured is the roundness, the difference between the measured radius and the average radius is the roundness tolerance, and the center deviation is calculated as follows:

[0036]

[0037] ∆x, ∆y — The projection value from the center determined by the design center line to the centroid of the installed device, that is, the center deviation of the device with the tested annular yoke on the X and Y axes.

[0038] n is the total number of measured points, which is 16 in this example;

[0039] i is the measuring point number; R i is the micrometer reading at point i; θ i is the angle between the i-th point and the +X axis.

[0040] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use a rotor annular yoke roundness measurement structure of the present invention, and can produce the positive effects recorded in the present invention.

[0041] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0042] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

[0043] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and affect variations to the disclosed embodiments by studying the drawings, disclosure, and appended claims. In addition, in the claims and the specification, words such as "comprises", "comprising", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0044] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A rotor annular yoke roundness measurement structure, characterized in that: The invention comprises an annular magnetic yoke (5), a pier (1) for supporting the annular magnetic yoke (5) is provided below the annular magnetic yoke (5), brackets (2) are provided on both sides of the annular magnetic yoke (5), a horizontal beam (3) is placed on the bracket (2), a positioner (4) is fixed on the horizontal beam (3), a conductive steel wire (7) is wound around the surface of the positioner (4), the conductive steel wire (7) is electrically connected to a battery pack (10), a heavy ball (8) passing through the center of the annular magnetic yoke is fixed at the lower end of the conductive steel wire (7), a micrometer (6) is provided between the inner surface of the annular magnetic yoke (5) and the conductive steel wire (7), and a resistor (11) and a comparison module (12) are electrically connected to the outer surface of the annular magnetic yoke (5).

2. A rotor annular yoke roundness measurement structure as claimed in claim 1, characterized in that: The comparison module (12) comprises a power supply (Ula), a first resistor (R2), a second resistor (R3), a third resistor (R4), a light-emitting diode (D2) and an operational amplifier (D1); an input signal terminal (Vin) of the comparison module (12) is connected to the non-inverting input terminal of the operational amplifier (D1); one end of the first resistor (R2) is connected to the power supply (Ula); the other end of the first resistor (R2) is connected to the inverting input terminal of the operational amplifier (D1); one end of the second resistor (R3) is grounded; the other end of the third resistor (R3) is connected to the non-inverting input terminal of the operational amplifier (D1); one end of the third resistor (R4) is grounded; the other end of the third resistor (R4) is connected to the output terminal of the operational amplifier (D1); and a light-emitting diode (D2) is connected in series between the output terminal of the operational amplifier (D1) and the third resistor (R4).

3. A rotor annular yoke roundness measurement structure as claimed in claim 1, characterized in that: An insulating oil barrel (9) is provided below the heavy ball (8), the insulating oil barrel (9) contains insulating oil, and the heavy ball (8) is immersed in the insulating oil.

4. A rotor annular yoke roundness measurement structure as claimed in claim 1, characterized in that: The surface of the annular magnetic yoke (5) is provided with an X-axis scale line and a Y-axis scale line, and the surface of the annular magnetic yoke (5) is provided with a first positioning steel wire (14) and a second positioning steel wire (15) passing through the X-axis scale line respectively, the intersection of the first positioning steel wire (14) and the second positioning steel wire (15) is the design center of the annular magnetic yoke (5), and the conductive steel wire (7) passes through the design center of the annular magnetic yoke (5).

5. A rotor annular yoke roundness measurement structure as claimed in claim 1, characterized in that: The inner surface of the annular magnetic yoke (5) is provided with a plurality of equally divided measuring points (16), and the micrometer (6) is capable of measuring the distance between each measuring point (16) and the conductive steel wire (7).

6. A rotor annular yoke roundness measurement structure as claimed in claim 2, characterized in that: The voltage of the battery pack (10) is set to Uo, the Uo range is 8V~12V, and the voltage range of the power supply (Ula) is 0.9Uo~0.95Uo.

7. A rotor annular yoke roundness measurement structure as claimed in claim 2, characterized in that: The value range of the first resistor (R2) and the second resistor (R3) is 1 kΩ~10 kΩ, and the value range of the third resistor (R4) is 10Ω~20Ω.

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