Method for measuring gap between stator and rotor of auxiliary exciter

Abstract

The invention discloses an auxiliary exciter stator and rotor gap measurement method, which is used for measuring a gap between a stator and a rotor of an auxiliary exciter, and comprises the following steps: S1, forming a plurality of measurement holes in the stator of the auxiliary exciter; s2, taking the coordinate of the stator circle center O of the auxiliary exciter as an original point of a coordinate system, and establishing a measurement coordinate system corresponding to the original point of the coordinate system; s3, enabling the plurality of distance measuring sensors to emit rays towards the circle center O of the stator, obtaining the coordinates of the plurality of positioning points, and determining the coordinate of the circle center P of the rotor of the auxiliary exciter; s4, the distances between the circle center O of the stator and the corresponding measuring points in different measuring directions are obtained; and S5, obtaining the gaps between the stator and the rotor of the auxiliary exciter in different measurement directions. According to the auxiliary exciter stator-rotor gap measurement method, the tightness of the bolt does not need to be adjusted blindly, so that the adjustment result is visualized in real time, the stator-rotor gap adjustment time is shortened, the efficiency is higher, the stator-rotor gap can be visually shown through a theoretical value, and experience is avoided.

Description

Technical Field

[0001] The invention relates to the field of auxiliary exciter maintenance, and in particular to a method for measuring the gap between a stator and a rotor of an auxiliary exciter. Background Art

[0002] When reinstalling the auxiliary exciter stator in a power plant, a feeler gauge is usually used to measure the stator-rotor air gap. However, different people have different feelings about the tightness of the feeler gauge after inserting it into the air gap, and the measurement results are somewhat subjective. In addition, if the feeler gauge is too tight, it may damage the insulating paint of the stator. At the same time, each time the stator bolts are tightened, it is necessary to measure again with a feeler gauge, which is time-consuming and laborious. Therefore, making a set of suitable measuring tools is crucial to shorten the maintenance period and increase the measurement accuracy. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for measuring the gap between the stator and rotor of an auxiliary exciter.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for measuring the gap between the stator and rotor of an auxiliary exciter, which is used to measure the gap between the stator and the rotor of the auxiliary exciter, and comprises the steps of:

[0005] S1. A plurality of measuring holes are opened on the stator of the auxiliary exciter, the extension shaft is coaxially connected to the rotor of the auxiliary exciter, the mounting base is coaxially connected to the stator of the auxiliary exciter, and a plurality of distance measuring sensors are installed on the mounting base;

[0006] S2. Taking the coordinates of the stator center O of the auxiliary exciter as the origin of the coordinate system, a measurement coordinate system corresponding to the origin of the coordinate system is established;

[0007] S3, making the plurality of distance measuring sensors emit rays toward the stator center O, taking the intersection of the rays emitted by each distance measuring sensor and the outer wall surface of the extended shaft as a positioning point, obtaining the coordinates of the plurality of positioning points, and determining the coordinates of the rotor center P of the auxiliary exciter through the coordinates of the plurality of positioning points;

[0008] S4, taking the direction from the stator center O toward the measuring hole as the measuring direction, taking the intersection of the straight line from the stator center O toward the measuring direction and the outer wall surface of the rotor of the auxiliary exciter as the measuring point, and using the coordinates of the rotor center P obtained in step S3 to obtain the distance between the stator center O and its corresponding measuring point in different measuring directions;

[0009] S5. Determine the actual radius of the rotor of the auxiliary exciter, and use the distance between the stator center O and its corresponding measuring point in different measuring directions obtained in step S4 to obtain the gap between the stator and the rotor of the auxiliary exciter in different measuring directions.

[0010] In some embodiments, in step S1, the number of the measuring holes is four, the four measuring holes are evenly spaced and arranged along the stator center of the auxiliary exciter, and the angle between the straight line from each measuring hole to the stator center O and the horizontal axis is 45°.

[0011] In some embodiments, the number of the distance measuring sensors is three, the three distance measuring sensors are evenly spaced about the central axis of the extension shaft, and the lasers emitted by the three distance measuring sensors intersect at the stator center O of the auxiliary exciter;

[0012] The three distance measuring sensors are divided into a first distance measuring device, a second distance measuring device and a third distance measuring device; the positioning point corresponding to the first distance measuring device is set as a first positioning point T1, the positioning point corresponding to the second distance measuring device is set as a second positioning point T2, and the positioning point corresponding to the third distance measuring device is set as a third positioning point T3;

[0013] The radius of the circle formed by the three ranging sensors is D, the distance from the first rangefinder to the first positioning point T1 is A, the distance from the second rangefinder to the second positioning point T2 is B, the distance from the third rangefinder to the third positioning point T3 is C, the coordinates of the first positioning point T1 are set to (X1, Y1), the coordinates of the second positioning point T2 are set to (X2, Y2), and the coordinates of the third positioning point T3 are set to (X3, Y3).

[0014] In some embodiments, in step S3, the coordinates of the third positioning point T3 are located on the X-axis of the measurement coordinate system, the coordinates of the first positioning point T1 are located in the fourth quadrant of the measurement coordinate system, and the coordinates of the second positioning point T2 are located in the third quadrant of the measurement coordinate system. The coordinates of each positioning point are calculated by a first formula, and the first formula is:

[0015] X1=(DA)sin30°, Y1=(DA)cos30°;

[0016] X2=(DB)sin30°, Y2=(DB)cos30°;

[0017] X3=DC, Y3=0.

[0018] In some embodiments, in step S3, the coordinates of the rotor center P of the auxiliary exciter are set to (X, Y), and the coordinates of the rotor center P of the auxiliary exciter are calculated by a second formula, and the second formula is:

[0019] (X-X1) 2 +(Y-Y1) 2 =(X-X2) 2 +(Y-Y2) 2 ;

[0020] (X-X1) 2 +(Y-Y1) 2 =(X-X3) 2 +(Y-Y3) 2 .

[0021] In some embodiments, in step S4, the distance G from the rotor center P to the stator center O is calculated by a third formula;

[0022] The third formula is:

[0023] In some embodiments, in step S4, the angle J° between the straight line from the rotor center P to the stator center O and the X-axis of the measurement coordinate system is calculated by the fourth formula;

[0024] The fourth formula is:

[0025] In some embodiments, in step S4, the distances between the stator center O and its corresponding measuring points in different measuring directions are calculated using the four measuring holes (11) as reference points;

[0026] The four measuring holes (11) are respectively set to be a first measuring hole E1, a second measuring hole E2, a third measuring hole E3 and a fourth measuring hole E4, wherein the first measuring hole E1 is located in a first quadrant of the measuring coordinate system, the second measuring hole E2 is located in a second quadrant of the measuring coordinate system, the third measuring hole E3 is located in a third quadrant of the measuring coordinate system, and the fourth measuring hole E4 is located in a fourth quadrant of the measuring coordinate system;

[0027] The measuring point when the first measuring hole E1 is used as a reference is M1, the measuring point when the second measuring hole E2 is used as a reference is M2, the measuring point when the third measuring hole E3 is used as a reference is M3, the measuring point when the fourth measuring hole E4 is used as a reference is M4, and the radius of the rotor of the auxiliary exciter is r 转 ;

[0028] The angle F1° between the straight line from the rotor center P to the measuring point M1 and the straight line from the stator center O to the measuring point M1 is calculated by the fifth formula, the angle F2° between the straight line from the rotor center P to the measuring point M2 and the straight line from the stator center O to the measuring point M2 is calculated by the sixth formula, the angle F3° between the straight line from the rotor center P to the measuring point M3 and the straight line from the stator center O to the measuring point M3 is calculated by the seventh formula, and the angle F4° between the straight line from the rotor center P to the measuring point M4 and the straight line from the stator center O to the measuring point M4 is calculated by the eighth formula;

[0029] The fifth formula is:

[0030] The sixth formula is:

[0031] The seventh formula is:

[0032] The eighth formula is:

[0033] In some embodiments, in step S4, the distance H1 from the measuring point M1 to the stator center O is calculated by the ninth formula, the distance H2 from the measuring point M2 to the stator center O is calculated by the tenth formula, the distance H3 from the measuring point M3 to the stator center O is calculated by the eleventh formula, and the distance H4 from the measuring point M4 to the stator center O is calculated by the twelfth formula;

[0034] The ninth formula is:

[0035] The tenth formula is:

[0036] The eleventh formula is:

[0037] The twelfth formula shown is:

[0038] In some embodiments, in step S5, the radius of the stator of the auxiliary exciter is r 定 , the gap W1 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M1 is calculated by the thirteenth formula, the gap W2 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M2 is calculated by the fourteenth formula, the gap W3 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M3 is calculated by the fifteenth formula, and the gap W4 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M4 is calculated by the sixteenth formula;

[0039] The thirteenth formula is: W1 = H1 - r 定 ;

[0040] The fourteenth formula is: W2 = H2-r 定 ;

[0041] The fifteenth formula is: W3 = H3 - r 定 ;

[0042] The sixteenth formula is: W4 = H4 - r 定 .

[0043] The implementation of the present invention has the following beneficial effects: the auxiliary exciter stator-rotor gap measurement method does not need to blindly adjust the tightness of the bolts, so that the adjustment result can be visualized in real time, the adjustment time of the stator-rotor gap can be reduced, the efficiency is higher, and the stator-rotor gap can be intuitively expressed through theoretical values, avoiding empiricism. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0045] Figure 1 is a schematic structural diagram of a stator-rotor gap measuring device for an auxiliary exciter in some embodiments of the present invention;

[0046] Figure 2 is a schematic diagram of calculating the center of a rotor in some embodiments of the present invention;

[0047] Figure 3 It is a schematic diagram for calculating the gap W1 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M1;

[0048] Figure 4 It is a schematic diagram for calculating the gap W2 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M2;

[0049] Figure 5 It is a schematic diagram for calculating the gap W3 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M3;

[0050] Figure 6 It is a schematic diagram for calculating the gap W4 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M4. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0052] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or one or more intermediate elements may be provided. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] See also Figure 1 , is a stator-rotor clearance measuring device for an auxiliary exciter in some embodiments of the present invention, and Figures 2 to 6 A method for measuring the gap between the stator and rotor of an auxiliary exciter in some embodiments of the present invention is used to measure the gap between the stator and the rotor of the auxiliary exciter, which comprises the steps of:

[0054] S1. A plurality of measuring holes 11 are opened on the stator of the auxiliary exciter, an extension shaft 12 is coaxially connected to the rotor of the auxiliary exciter, a mounting seat 13 is coaxially connected to the stator of the auxiliary exciter, and a plurality of distance measuring sensors 14 are installed on the mounting seat 13;

[0055] S2. Taking the coordinate of the stator center O of the auxiliary exciter as the origin of the coordinate system, establish a measurement coordinate system corresponding to the origin of the coordinate system;

[0056] S3, making multiple distance measuring sensors 14 emit rays toward the stator center O, taking the intersection of the rays emitted by each distance measuring sensor 14 and the outer wall surface of the extension shaft 12 as the positioning point, obtaining the coordinates of the multiple positioning points, and determining the coordinates of the rotor center P of the auxiliary exciter through the coordinates of the multiple positioning points;

[0057] S4, taking the direction from the stator center O to the measuring hole 11 as the measuring direction, taking the intersection of the straight line from the stator center O to the measuring direction and the outer wall surface of the rotor of the auxiliary exciter as the measuring point, and using the coordinates of the rotor center P obtained in step S3 to obtain the distance between the stator center O and its corresponding measuring point in different measuring directions;

[0058] S5. Determine the actual radius of the rotor of the auxiliary exciter, and obtain the gap between the stator and the rotor of the auxiliary exciter in different measuring directions by the distance between the stator center O and its corresponding measuring point in different measuring directions obtained in step S4.

[0059] Specifically, the auxiliary exciter stator-rotor gap measurement method is based on the auxiliary exciter stator-rotor gap measurement device, such as Figure 1 As shown, the auxiliary exciter stator-rotor gap measuring device comprises an extension shaft 12, a mounting seat 13 and a plurality of distance measuring sensors 14. The extension shaft 12 is coaxially connected to the rotor of the auxiliary exciter and is used to extend the rotating shaft of the auxiliary exciter rotor. The mounting seat 13 is coaxially connected to the stator of the auxiliary exciter and is cylindrically arranged with an outer diameter of 230 mm and a height of 67 mm. The mounting seat 13 is provided with a positioning stop to ensure the relative position with the auxiliary exciter stator, and the mounting seat 13 can be fixed to the auxiliary exciter stator by a set bolt. A plurality of distance measuring sensors 14 can be installed on the mounting seat 13, and the distance measuring sensor 14 is preferably a laser distance measuring sensor, which can measure the distance from the laser distance measuring sensor 14 to the outer wall of the extension shaft 12 by the emitted laser beam. It can be understood that the extension shaft 12 and the auxiliary exciter rotor are an integral body, and the mounting seat 13 and the distance measuring sensor 14 are an integral body with the auxiliary exciter stator.

[0060] like Figure 2 As shown, there are three ranging sensors 14, and the three ranging sensors 14 are evenly spaced about the central axis of the extension shaft 12, and the lasers emitted by the three ranging sensors 14 intersect the stator center O of the auxiliary exciter. Further, the three ranging sensors 14 are divided into a first ranging sensor 141, a second ranging sensor 142, and a third ranging sensor 143, and the positioning point corresponding to the first ranging sensor 141 is set as the first positioning point T1, the positioning point corresponding to the second ranging sensor 142 is set as the second positioning point T2, and the positioning point corresponding to the third ranging sensor 143 is set as the third positioning point T3. The radius of the circle formed by the three ranging sensors 14 is D, the distance from the first rangefinder 141 to the first positioning point T1 is A, the distance from the second rangefinder 142 to the second positioning point T2 is B, the distance from the third rangefinder 143 to the third positioning point T3 is C, the coordinates of the first positioning point T1 are set to (X1, Y1), the coordinates of the second positioning point T2 are set to (X2, Y2), and the coordinates of the third positioning point T3 are set to (X3, Y3). The angle difference between each ranging sensor 14 is 120°.

[0061] In step S3, the coordinates of the third positioning point T3 are located on the X-axis of the measurement coordinate system, the coordinates of the first positioning point T1 are located in the fourth quadrant of the measurement coordinate system, and the coordinates of the second positioning point T2 are located in the third quadrant of the measurement coordinate system. The coordinates of each positioning point are calculated by the first formula, which is:

[0062] X1=(DA)sin30°, Y1=(DA)cos30°;

[0063] X2=(DB)sin30°, Y2=(DB)cos30°;

[0064] X3=DC, Y3=0.

[0065] In the first formula, the radius D of the circle formed by the three distance measuring sensors (14) is determined, and the values ​​of A, B, and C can be obtained by each distance measuring sensor (14), thereby obtaining the coordinates of each positioning point.

[0066] In step S3, the coordinates of the rotor center P of the auxiliary exciter are set to (X, Y), and the coordinates of the rotor center P of the auxiliary exciter are calculated by the second formula, which is:

[0067] (X-X1) 2 +(Y-Y1) 2 =(X-X2) 2 +(Y-Y2) 2 ;

[0068] (X-X1) 2 +(Y-Y1) 2 =(X-X3) 2 +(Y-Y3) 2 .

[0069] It can be understood that in step S3, the coordinates of each positioning point are obtained and substituted into the coordinate value of each positioning point to solve the X value and Y value of the coordinate of the center P of the rotor.

[0070] In step S4, the distance G from the rotor center P to the stator center O is calculated by the third formula;

[0071] The third formula is:

[0072] The coordinate of the stator center O is the origin of the coordinate axis, that is, (0,0), and the coordinate of the rotor center P has been calculated by the second formula. The distance G from the rotor center P to the stator center O can be calculated by the third formula.

[0073] Further, in step S4, the angle J° between the straight line from the rotor center P to the stator center O and the X-axis of the measurement coordinate system is calculated by the fourth formula;

[0074] The fourth formula is:

[0075] like Figures 2 to 6As shown, in step S1, the number of measuring holes 11 is four, and the four measuring holes 11 are evenly spaced and arranged along the center of the stator of the auxiliary exciter, and the angle between the straight line from each measuring hole 11 to the center O of the stator and the horizontal axis is 45°. According to the four measuring holes 11 set in step S1, in step S4, the distance from the outer wall of the rotor to the center O of the stator is calculated with the four measuring holes 11 as reference points. Among them, the four measuring holes 11 are set as the first measuring hole E1, the second measuring hole E2, the third measuring hole E3 and the fourth measuring hole E4, respectively. The first measuring hole E1 is located in the first quadrant of the measuring coordinate system, the second measuring hole E2 is located in the second quadrant of the measuring coordinate system, the third measuring hole E3 is located in the third quadrant of the measuring coordinate system, and the fourth measuring hole E4 is located in the fourth quadrant of the measuring coordinate system;

[0076] The intersection of the straight line from the outer wall of the rotor to the center of the stator O and the outer wall of the rotor is taken as the measuring point. The measuring point when the first measuring hole E1 is used as the reference is M1, the measuring point when the second measuring hole E2 is used as the reference is M2, the measuring point when the third measuring hole E3 is used as the reference is M3, the measuring point when the fourth measuring hole E4 is used as the reference is M4, and the radius of the rotor of the auxiliary exciter is r 转 .

[0077] The angle F1° between the straight line from the rotor center P to the measuring point M1 and the straight line from the stator center O to the measuring point M1 is calculated by the fifth formula, the angle F2° between the straight line from the rotor center P to the measuring point M2 and the straight line from the stator center O to the measuring point M2 is calculated by the sixth formula, the angle F3° between the straight line from the rotor center P to the measuring point M3 and the straight line from the stator center O to the measuring point M3 is calculated by the seventh formula, and the angle F4° between the straight line from the rotor center P to the measuring point M4 and the straight line from the stator center O to the measuring point M4 is calculated by the eighth formula;

[0078] The fifth formula is:

[0079] The sixth formula is:

[0080] The seventh formula is:

[0081] The eighth formula is:

[0082] Understandably, the 转The value of is the value from the rotor center P to each measuring point, is the radius of the rotor of the auxiliary exciter, and is a fixed value. In this embodiment, to measure the gap between the stator and the rotor of the auxiliary exciter in the direction of each measuring point, the angle between the straight line from each rotor center P to each measuring point and the straight line from the stator center O to each measuring point is first calculated by the fifth formula, the sixth formula, the seventh formula, and the eighth formula. In other embodiments, more measuring points can be set, or the arrangement of the measuring points can be adaptively adjusted.

[0083] In step S4, the distance H1 from the measuring point M1 to the stator center O is calculated by the ninth formula, the distance H2 from the measuring point M2 to the stator center O is calculated by the tenth formula, the distance H3 from the measuring point M3 to the stator center O is calculated by the eleventh formula, and the distance H4 from the measuring point M4 to the stator center O is calculated by the twelfth formula;

[0084] The ninth formula is:

[0085] The tenth formula is:

[0086] The eleventh formula is:

[0087] The twelfth formula is:

[0088] In step S5, the radius of the stator of the auxiliary exciter is r 定 , the gap W1 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M1 is calculated by the thirteenth formula, the gap W2 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M2 is calculated by the fourteenth formula, the gap W3 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M3 is calculated by the fifteenth formula, and the gap W4 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M4 is calculated by the sixteenth formula;

[0089] The thirteenth formula is: W1 = H1-r 定 ;

[0090] The fourteenth formula is: W2=H2-r 定 ;

[0091] The fifteenth formula is: W3 = H3-r 定 ;

[0092] The sixteenth formula is: W4 = H4-r 定 .

[0093] Among them, the radius r of the stator of the auxiliary exciter 定The value of is fixed, and the gap between the stator and the rotor of the auxiliary exciter in the direction of each measuring point can be calculated based on the distance from each measuring point to the stator center O obtained in step S4.

[0094] The above formulas can be automatically calculated in a computer. When the stator and the rotor of the auxiliary exciter are disassembled, the mounting seat 13 and the sensor are not removed. After the stator and the rotor of the auxiliary exciter are reassembled after the maintenance, the gap between the stator and the rotor of the auxiliary exciter in the direction of each measuring point after reassembly can be calculated by a computer according to the above formula, and then the gap between the stator and the rotor of the auxiliary exciter in the direction of each measuring point before disassembly can be compared to adjust the rotor of the auxiliary exciter until the data before and after correspond to each other.

[0095] The auxiliary exciter stator-rotor clearance measurement method does not need to blindly adjust the tightness of the bolts, so that the adjustment result can be visualized in real time, the adjustment time of the stator-rotor clearance can be reduced, and the efficiency is higher. The stator-rotor clearance can be intuitively expressed through theoretical values, avoiding empiricism.

[0096] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A method for measuring the gap between the stator and rotor of an auxiliary exciter, used to measure the gap between the stator and rotor of the auxiliary exciter, characterized in that: Includes steps: S1. A plurality of measuring holes (11) are provided on the stator of the auxiliary exciter, an extension shaft (12) is coaxially connected to the rotor of the auxiliary exciter, a mounting seat (13) is coaxially connected to the stator of the auxiliary exciter, and a plurality of distance measuring sensors (14) are installed on the mounting seat (13); S2. Taking the coordinates of the stator center O of the auxiliary exciter as the origin of the coordinate system, a measurement coordinate system corresponding to the origin of the coordinate system is established; S3, making the plurality of distance measuring sensors (14) emit rays toward the stator center O, taking the intersection of the rays emitted by each distance measuring sensor (14) and the outer wall surface of the extended shaft (12) as a positioning point, obtaining the coordinates of the plurality of positioning points, and determining the coordinates of the rotor center P of the auxiliary exciter through the coordinates of the plurality of positioning points; S4, taking the direction from the stator center O toward the measuring hole (11) as the measuring direction, taking the intersection of the straight line from the stator center O toward the measuring direction and the outer wall surface of the rotor of the auxiliary exciter as the measuring point, and using the coordinates of the rotor center P obtained in step S3 to obtain the distance between the stator center O and its corresponding measuring point in different measuring directions; S5. Determine the actual radius of the rotor of the auxiliary exciter, and use the distance between the stator center O and its corresponding measuring point in different measuring directions obtained in step S4 to obtain the gap between the stator and the rotor of the auxiliary exciter in different measuring directions.

2. The method for measuring the stator-rotor gap of the auxiliary exciter according to claim 1, characterized in that: In step S1, the number of the measuring holes (11) is four, the four measuring holes (11) are evenly spaced and arranged along the center of the stator of the auxiliary exciter, and the angle between the straight line from each measuring hole (11) to the center O of the stator and the horizontal axis is 45°.

3. The method for measuring the stator-rotor gap of the auxiliary exciter according to claim 2, characterized in that: The number of the distance measuring sensors (14) is three, the three distance measuring sensors (14) are evenly spaced about the central axis of the extension shaft (12), and the lasers emitted by the three distance measuring sensors (14) intersect at the stator center O of the auxiliary exciter; The three distance measuring sensors (14) are divided into a first distance measuring device (141), a second distance measuring device (142) and a third distance measuring device (143); the positioning point corresponding to the first distance measuring device (141) is set as a first positioning point T1, the positioning point corresponding to the second distance measuring device (142) is set as a second positioning point T2, and the positioning point corresponding to the third distance measuring device (143) is set as a third positioning point T3; The radius of a circle formed by connecting the three distance measuring sensors (14) is D, the distance from the first distance measuring device (141) to the first positioning point T1 is A, the distance from the second distance measuring device (142) to the second positioning point T2 is B, the distance from the third distance measuring device (143) to the third positioning point T3 is C, the coordinates of the first positioning point T1 are set to (X1, Y1), the coordinates of the second positioning point T2 are set to (X2, Y2), and the coordinates of the third positioning point T3 are set to (X3, Y3).

4. The method for measuring the stator-rotor gap of the auxiliary exciter according to claim 3, characterized in that: In step S3, the coordinates of the third positioning point T3 are located on the X-axis of the measurement coordinate system, the coordinates of the first positioning point T1 are located in the fourth quadrant of the measurement coordinate system, and the coordinates of the second positioning point T2 are located in the third quadrant of the measurement coordinate system. The coordinates of each positioning point are calculated by the first formula, and the first formula is: X1=(DA)sin30°, Y1=(DA)cos30°; X2=(DB)sin30°, Y2=(DB)cos30°; X3=DC, Y3=0.

5. The method for measuring the stator-rotor gap of the auxiliary exciter according to claim 4, characterized in that: In step S3, the coordinates of the rotor center P of the auxiliary exciter are set to (X, Y), and the coordinates of the rotor center P of the auxiliary exciter are calculated by the second formula, and the second formula is: (X-X1) 2 +(Y-Y1) 2 =(X-X2) 2 +(Y-Y2) 2 ; (X-X1) 2 +(Y-Y1) 2 =(X-X3) 2 +(Y-Y3) 2 。 6. The method for measuring the stator-rotor gap of an auxiliary exciter according to claim 5, characterized in that: In step S4, the distance G from the rotor center P to the stator center O is calculated by the third formula; The third formula is:

7. The method for measuring the stator-rotor gap of an auxiliary exciter according to claim 6, characterized in that: In step S4, the angle J° between the straight line from the rotor center P to the stator center O and the X-axis of the measurement coordinate system is calculated by the fourth formula; The fourth formula is:

8. The method for measuring the stator-rotor gap of an auxiliary exciter according to claim 7, characterized in that: In step S4, the distances between the center O of the stator and its corresponding measuring points in different measuring directions are calculated using the four measuring holes (11) as reference points; The four measuring holes (11) are respectively set to be a first measuring hole E1, a second measuring hole E2, a third measuring hole E3 and a fourth measuring hole E4, wherein the first measuring hole E1 is located in a first quadrant of the measuring coordinate system, the second measuring hole E2 is located in a second quadrant of the measuring coordinate system, the third measuring hole E3 is located in a third quadrant of the measuring coordinate system, and the fourth measuring hole E4 is located in a fourth quadrant of the measuring coordinate system; The measuring point when the first measuring hole E1 is used as a reference is M1, the measuring point when the second measuring hole E2 is used as a reference is M2, the measuring point when the third measuring hole E3 is used as a reference is M3, the measuring point when the fourth measuring hole E4 is used as a reference is M4, and the radius of the rotor of the auxiliary exciter is r 转 ; The angle F1° between the straight line from the rotor center P to the measuring point M1 and the straight line from the stator center O to the measuring point M1 is calculated by the fifth formula, the angle F2° between the straight line from the rotor center P to the measuring point M2 and the straight line from the stator center O to the measuring point M2 is calculated by the sixth formula, the angle F3° between the straight line from the rotor center P to the measuring point M3 and the straight line from the stator center O to the measuring point M3 is calculated by the seventh formula, and the angle F4° between the straight line from the rotor center P to the measuring point M4 and the straight line from the stator center O to the measuring point M4 is calculated by the eighth formula; The fifth formula is: The sixth formula is: The seventh formula is: The eighth formula is:

9. The method for measuring the stator-rotor gap of an auxiliary exciter according to claim 8, characterized in that: In step S4, the distance H1 from the measuring point M1 to the stator center O is calculated by the ninth formula, the distance H2 from the measuring point M2 to the stator center O is calculated by the tenth formula, the distance H3 from the measuring point M3 to the stator center O is calculated by the eleventh formula, and the distance H4 from the measuring point M4 to the stator center O is calculated by the twelfth formula; The ninth formula is: The tenth formula is: The eleventh formula is: The twelfth formula shown is:

10. The method for measuring the stator-rotor gap of an auxiliary exciter according to claim 9, characterized in that: In step S5, the radius of the stator of the auxiliary exciter is r 定 , the gap W1 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M1 is calculated by the thirteenth formula, the gap W2 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M2 is calculated by the fourteenth formula, the gap W3 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M3 is calculated by the fifteenth formula, and the gap W4 between the stator and the rotor of the auxiliary exciter in the direction of the measuring point M4 is calculated by the sixteenth formula; The thirteenth formula is: W1 = H1 - r 定 ; The fourteenth formula is: W2 = H2-r 定 ; The fifteenth formula is: W3 = H3 - r 定 ; The sixteenth formula is: W4 = H4 - r 定 .

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