Device and method for measuring air gap of generator based on laser

Abstract

The invention relates to the technical field of generator maintenance, in particular to a device and a method for measuring an air gap of a generator based on laser. The device comprises a target ball, a laser tracker, a calculation module and a measuring head, the measuring head is arranged on the target ball, and the target ball is used for measuring the spatial positions of a rotor and a stator; the target ball is electrically connected with the laser tracker, and the laser tracker is used for receiving the spatial position when the target ball moves and converting the spatial position into spatial data; the laser tracker is electrically connected with the calculation module, and the calculation module establishes a space model by reading data of the laser tracker. According to the invention, the space models of the rotor and the stator are established through the laser measurement means and the movement of the target ball, and the calculation module is adopted to measure the gap, so that the size measurement precision is improved, and the gap abnormity can be identified before the rotor is reassembled and can be adjusted during reassembling.

Description

Technical Field

[0001] The present invention relates to the technical field of generator maintenance, and particularly to a device and a measurement method for measuring the air gap of a generator based on laser measurement. Background Art

[0002] The air gap between the stator and rotor of a generator refers to the gap between the rotor of the generator and the iron core of the stator of the generator. This air gap is required to be circumferentially uniform. Taking a 660MW generator as an example, the measured values in the four directions of up, down, left, and right of the air gap are required to have a difference from the average value of no more than 0.76 mm. Once the air gap is uneven, it will cause the magnetic field of the generator rotor to become unstable during operation, thereby affecting the operation stability of the generator. In addition, the uneven air gap will cause the efficiency of the generator to decrease and increase the energy consumption of the generator. Therefore, accurately measuring and controlling the uniformity of the air gap is very important for the operation and maintenance of the generator.

[0003] At present, the method for measuring the air gap of a generator is relatively simple, that is, after the unit is shut down, the generator end cover is opened, an insulating board is inserted into the gap between the stator and the rotor, and relying on the feeling of the measuring personnel, when it is considered that the thickness of the board is close to the gap, then the thickness of the board is measured as the distance of the stator-rotor gap. This method has some deficiencies: the measurement results depend on the feeling of the personnel, resulting in different measurement results for different personnel, which is not conducive to data management and control; at the same time, the insulating board usually uses epoxy resin or wood materials, with a large deformation, resulting in inaccurate measurement results. Summary of the Invention

[0004] The present invention provides a measurement method for measuring the air gap of a generator based on laser measurement, which is used to solve the problems that the method for measuring the stator-rotor gap in the prior art depends on the feeling of the operator and the insulating board used for measurement has a large deformation, resulting in inaccurate measurement results.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention proposes a device for measuring the air gap of a generator based on laser measurement. The device includes a target ball, a laser tracker, a calculation module, and a probe. The probe is provided on the target ball, and the target ball is used to measure the spatial positions of the rotor and the stator; the target ball is electrically connected to the laser tracker, and the laser tracker is used to receive the spatial positions when the target ball moves and convert them into spatial data; the laser tracker is electrically connected to the calculation module, and the calculation module establishes a spatial model by reading the data of the laser tracker.

[0007] The present invention proposes a measurement method for measuring the air gap of a generator based on laser measurement. The method includes:

[0008] Step 1: Measure the radial and axial distances at the oil baffle recess mating parts between the rotor and the stator of the generator respectively, and measure the axial distance between the end face of the oil baffle recess of the stator and the shaft shoulder of the generator rotor.

[0009] Step 2: Establish a spatial coordinate model of the rotor outer diameter;

[0010] Step 2.1: Withdraw the rotor from the generator and place it on the rotor bracket, and use a laser measuring device to establish a rotor size model at the mating part of the rotor and the oil baffle pocket;

[0011] Step 2.2: Use a laser measuring device to establish a rotor size model at the mating part of the rotor and the stator;

[0012] Step 2.3: Connect the outer edges of the profile paths of the rotor size model in Step 2.1 and the rotor size model in Step 2.2 to obtain a spatial coordinate model of the rotor outer diameter.

[0013] Step 3: Establish a spatial coordinate model of the stator inner diameter;

[0014] Step 3.1: Remove the adjacent steam turbine bearings of the stator, and use a laser measuring device to establish a stator size model at the mating part of the rotor and the oil baffle pocket;

[0015] Step 3.2: Use a laser measuring device to establish a stator size model at the mating part of the rotor and the stator;

[0016] Step 3.3: Connect the outer edges of the profile paths of the stator size model in Step 3.1 and the stator size model in Step 3.2 to obtain a spatial coordinate model of the stator inner diameter.

[0017] Step 4: According to the gap value between the generator rotor and the oil baffle pocket and the axial distance between the end face of the oil baffle pocket and the rotor shoulder of the generator measured in Step 1, use a laser measuring device to assemble the spatial coordinate model of the rotor outer diameter and the spatial coordinate model of the stator inner diameter, and calculate the stator-rotor air gap value of the assembled model.

[0018] In some embodiments, measuring the horizontal and vertical distances between the generator rotor and the stator oil baffle pocket in Step 1 specifically includes:

[0019] Step 1.1: Remove the outer oil baffle of the generator bearing, mark the leftmost horizontal point of the rotor at the mating part of the rotor and the oil baffle pocket as point a, and rotate counterclockwise by 90 degrees and 180 degrees respectively to mark points b and c;

[0020] Step 1.2: Use an internal micrometer to measure the radial clearances between the rotor and the oil baffle pocket at points a, b, and c respectively, record the measurement results, and measure and record the axial distance between the end face of the oil baffle pocket and the rotor shoulder.

[0021] In some embodiments, in step 2.1, a rotor size model at the mating part of the rotor and the oil baffle pocket is established using a laser measurement device. The laser measurement device includes a target ball, a laser tracker, a calculation module, and a probe. The probe is provided on the target ball, and the target ball is electrically connected to the laser tracker. A space coordinate system is established with the laser tracker as the origin. The laser tracker receives the spatial position of the probe of the target ball when it moves and records it in a three-dimensional coordinate system. The laser tracker is electrically connected to the calculation module; the calculation module determines the contour paths and centers of the stator and the rotor by receiving the spatial coordinates measured by the laser tracker.

[0022] In some embodiments, specifically, in step 2.1, establishing a rotor size model at the mating part of the rotor and the oil baffle pocket using a laser measurement device includes: arranging a laser tracker near the rotor, rotating the target ball along the outermost circumferential direction of the rotor at the mating part of the rotor and the oil baffle pocket, and pausing once every certain angle of rotation; the laser tracker records the spatial coordinates of the outer circumference of the rotor during the measurement process, and the calculation module establishes a rotor size model at the mating part of the rotor and the oil baffle pocket based on the measurement results.

[0023] In some embodiments, specifically, in step 2.2, establishing a rotor size model at the mating part of the rotor and the stator using a laser measurement device includes: keeping the position of the laser tracker unchanged, rotating the target ball along the outermost circumferential direction of the rotor at the mating part of the rotor and the stator, and pausing once every certain angle of rotation; the laser tracker records the spatial coordinates of the outer circumference of the rotor during the measurement process, and the calculation module establishes a rotor size model at the mating part of the rotor and the stator based on the measurement results.

[0024] In some embodiments, specifically, in step 3.1, establishing a stator size model at the mating part of the rotor and the oil baffle pocket using a laser measurement device includes: arranging a laser tracker on the steam turbine bearing box, rotating the target ball along the circumferential direction of the inner diameter of the stator at the mating part of the rotor and the oil baffle pocket, and pausing once every certain angle of rotation; the laser tracker records the spatial coordinates of the inner diameter of the stator during the measurement process, and the calculation module establishes a stator size model at the mating part of the rotor and the oil baffle pocket based on the measurement results.

[0025] In some embodiments, specifically, in step 3.2, establishing a stator size model at the mating part of the rotor and the stator using a laser measurement device includes: keeping the position of the laser tracker unchanged, rotating the target ball along the circumferential direction of the inner diameter of the stator at the mating part of the rotor and the stator, and pausing once every certain angle of rotation; the laser tracker records the spatial coordinates of the inner diameter of the stator during the measurement process, and the calculation module establishes a stator size model at the mating part of the rotor and the stator based on the measurement results.

[0026] In some embodiments, in step two, the target ball is operated to rotate along the outermost circumferential direction of the rotor, and it stops once every certain rotation angle, where the rotation angle is 30 degrees; in step three, the target ball is operated to rotate along the inner diameter of the stator in the circumferential direction, and it stops once every certain rotation angle, where the rotation angle is 30 degrees.

[0027] In some embodiments, a measurement method for measuring the air gap of a generator based on laser measurement is characterized in that the rotor size model at the mating part of the rotor and the oil baffle sump includes the rotor contour path and the center of the contour path at the mating part of the rotor and the oil baffle sump; the rotor size model at the mating part of the rotor and the stator includes the rotor contour path and the center of the contour path at the mating part of the rotor and the stator; the stator size model at the mating part of the rotor and the oil baffle sump includes the inner diameter contour path of the stator and the center of the contour path at the mating part of the rotor and the oil baffle sump; the stator size model at the mating part of the rotor and the stator includes the inner diameter contour path of the stator and the center of the contour path at the mating part of the rotor and the stator.

[0028] In some embodiments, in step four, calculating the air gap value between the rotor and the stator of the assembled model specifically includes: calculating the dimensional difference between the rotor contour path and the stator contour path to obtain the air gap value between the stator and the rotor of the generator.

[0029] Implementing the present invention has the following beneficial effects

[0030] The present invention provides a device and a measurement method for measuring the air gap of a generator based on laser measurement. Compared with the existing manual measurement method, through laser measurement means, a spatial model of the rotor and the stator is established by moving the target ball, and a calculation module is used for gap measurement, which improves the accuracy of dimension measurement, can identify abnormal gaps before reinstalling the rotor, and can be adjusted during reinstallation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the rotor of a measurement method for measuring the air gap of a generator based on laser measurement proposed in an embodiment of the present invention;

[0032] Figure 2 It is a cross-sectional view of the stator of a measurement method for measuring the air gap of a generator based on laser measurement proposed in an embodiment of the present invention;

[0033] Figure 3 It is a flowchart of a measurement method for measuring the air gap of a generator based on laser measurement proposed in an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of a laser measurement device of a measurement method for measuring the air gap of a generator based on laser measurement proposed in an embodiment of the present invention;

[0035] Figure 5Schematic diagram of the mating part between the rotor and the oil baffle depression for a measurement method of measuring the air gap of a generator based on laser proposed in an embodiment of the present invention;

[0036] Figure 6 Schematic diagram of the spatial coordinate model of the outer diameter of the rotor for a measurement method of measuring the air gap of a generator based on laser proposed in an embodiment of the present invention;

[0037] Figure 7 Schematic diagram of the measurement of the spatial coordinate model of the inner diameter of the stator for a measurement method of measuring the air gap of a generator based on laser proposed in an embodiment of the present invention;

[0038] Figure 8 Schematic diagram of the assembly of the rotor and the stator for a measurement method of measuring the air gap of a generator based on laser proposed in an embodiment of the present invention;

[0039] Description of the drawings: 1. Target ball; 2. Laser tracker; 3. Calculation module; 4. Probe; 5. Stator dimension model at the mating part between the rotor and the oil baffle depression; 6. Stator dimension model at the mating part between the rotor and the stator; 7. Rotor; 8. Stator; 9. Rotor contour path at the mating part between the rotor and the oil baffle depression; 10. Center of the rotor contour path at the mating part between the rotor and the oil baffle depression; 11. Rotor contour path at the mating part between the rotor and the stator; 12. Center of the rotor contour path at the mating part between the rotor and the stator; 13. Steam turbine bearing box; 14. Rotor dimension model at the mating part between the rotor and the oil baffle depression; 15. Rotor dimension model at the mating part between the rotor and the stator. Detailed implementation manners

[0040] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific implementation manners. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figures 1 to 8 shown, taking a 600 - 660MW class generator as an example, the present invention proposes a generator air gap device based on laser measurement. The device includes a target ball 1, a laser tracker 2, a calculation module 3, and a probe 4. The target ball 1 is provided with a probe 4, and the target ball 1 is used to measure the spatial positions of the rotor 7 and the stator 8; the target ball 1 is electrically connected to the laser tracker 2, and the laser tracker 2 is used to receive the spatial positions when the target ball 1 moves and convert them into spatial data; the laser tracker 2 is electrically connected to the calculation module 3, and the calculation module 3 establishes a spatial model by reading the data of the laser tracker 2.

[0042] The present invention proposes a measurement method for measuring the air gap of a generator based on laser, and the method includes:

[0043] Step 1: As shown in Figure 5 , measure the radial and axial distances at the mating part of the oil baffle pocket between the rotor 7 and the stator 8 of the generator respectively, and measure the axial distance between the end face of the oil baffle pocket of the stator 8 and the shoulder of the generator rotor 7;

[0044] Step 1.1: Remove the outer oil baffle of the generator bearing, mark the leftmost horizontal point of the rotor 7 as point a, and rotate counterclockwise by 90 degrees and 180 degrees respectively, and mark points b and c.

[0045] Step 1.2: Use an internal micrometer to measure the radial clearances between the rotor 7 and the oil baffle pocket at points a, b, and c respectively, and record the measurement results in Table 1. Measure and record the axial distance between the end face of the oil baffle pocket and the shoulder of the generator rotor 7 as the record of the axial position relationship between the generator rotor 7 and the generator stator 8.

[0046] Step 2: As shown in Figure 6 , establish a spatial coordinate model of the rotor 7;

[0047] Step 2.1: Withdraw the rotor 7 from the generator and place it on the rotor 7 bracket, and use a laser measuring device to establish a rotor 7 dimension model at the mating part of the rotor 7 and the oil baffle pocket. This step specifically includes: Arrange a laser tracker 2 near the rotor 7. After confirming that the target ball 1 is secure and the computer equipment power supply is available, use the position of the laser tracker 2 as the origin of the three-dimensional coordinate system in the calculation module 3, and then perform the measurement. Rotate the target ball 1 along the outermost circumferential direction of the rotor 7 at the mating part of the rotor 7 and the oil baffle pocket, and stop every about 30 degrees of rotation. The laser tracker 2 will automatically receive the spatial position of the target ball 1 during movement and record it in the three-dimensional coordinate system according to its position relationship with the origin. After the measurement of one full circle of the rotor 7 is completed, use the calculation module 3 to calculate the rotor profile path 9 at the mating part of the generator rotor and the oil baffle pocket and the center 10 of the rotor profile path at the mating part of the rotor and the oil baffle pocket, and establish a rotor dimension model 15 at the mating part of the rotor and the oil baffle pocket.

[0048] Step 2.2: Use a laser measuring device to establish a rotor 7 dimension model at the mating part of the rotor 7 and the stator 8. This step specifically includes: Keep the position of the laser tracker 2 unchanged, rotate the target ball 1 along the outermost circumferential direction of the rotor 7 at the mating part of the rotor 7 and the stator 8, and use an extension rod to connect the target ball 1 when the measurement distance is insufficient, and stop every about 30 degrees of rotation. The laser tracker 2 will automatically receive the spatial position of the target ball 1 during movement and record it in the three-dimensional coordinate system according to its position relationship with the origin. After the measurement of one full circle of the rotor 7 is completed, use the calculation module 3 to calculate the rotor profile path 11 at the mating part of the generator rotor and the stator and the center 12 of the rotor profile path at the mating part of the rotor and the stator, and establish a rotor dimension model 15 at the mating part of the rotor and the stator.

[0049] Step 2.3: Connect the outer edge of the contour path end face of the rotor 7 dimension model in Step 2.1 to that of the rotor 7 dimension model in Step 2.2, and obtain a cylinder-like shape in the three-dimensional coordinate system, which can represent the local dimensions and shape of the generator rotor 7, and obtain the outer diameter space coordinate model of the rotor 7. The size of this space coordinate model is an absolute value and is consistent with the actual object size.

[0050] Step Three: As Figure 7 shown, establish the inner diameter space coordinate model of the stator 8;

[0051] Step 3.1: Remove the adjacent steam turbine bearings of the stator 8, and use a laser measuring device to establish the stator dimension model 5 at the mating position of the rotor and the oil baffle pocket. This step specifically includes: Arrange the laser tracker 2 on the steam turbine bearing box 13 about 2 meters outside the end face of the generator stator 8. After confirming that the target ball 1 is firm and the power supply of the computer device is available, take the position where the laser tracker 2 is located as the origin of the three-dimensional coordinate system in the calculation module 3, and then perform the measurement. Rotate the target ball 1 along the circumference of the inner diameter of the stator 8 at the mating position of the rotor 7 and the oil baffle pocket, and stop every about 30 degrees of rotation; the laser tracker 2 will automatically receive the spatial position of the target ball 1 when it moves, and record it in the three-dimensional coordinate system according to its position relationship with the origin. After measuring one full circle of the rotor 7, use the calculation module 3 to calculate the inner diameter contour path of the stator 8 at the mating position of the generator rotor 7 and the oil baffle pocket and the center of the contour path, and establish the stator dimension model 5 at the mating position of the rotor and the oil baffle pocket.

[0052] Step 3.2: Use a laser measuring device to establish the stator dimension model 6 at the mating position of the rotor and the stator. This step specifically includes: Keep the position of the laser tracker 2 unchanged, rotate the target ball 1 along the circumference of the inner diameter of the stator 8 at the mating position of the rotor 7 and the stator 8. When the measurement distance is insufficient, a lengthening rod can be used to connect the target ball 1, and stop every about 30 degrees of rotation. The laser tracker 2 will automatically receive the spatial position of the target ball 1 when it moves, and record it in the three-dimensional coordinate system according to its position relationship with the origin. After measuring one full circle of the rotor 7, use the calculation module 3 to calculate the inner diameter contour path of the stator 8 at the mating position of the generator rotor 7 and the stator 8 and the center of the contour path, and establish the stator dimension model 6 at the mating position of the rotor and the stator.

[0053] Step 3.3: Connect the outer edge of the contour path end face of the stator 8 dimension model in Step 3.1 to that of the stator 8 dimension model in Step 3.2, and obtain a cylinder-like shape in the three-dimensional coordinate system, which can represent the local dimensions and shape of the generator stator 8, and obtain the outer diameter space coordinate model of the stator 8. The size of this space coordinate model is an absolute value and is consistent with the actual object size.

[0054] Step Four: As Figure 8As shown, according to the gap value between the generator rotor 7 and the oil baffle recess measured in Step 1 and the axial distance between the end face of the oil baffle recess and the shoulder of the generator rotor 7 shaft, the calculation module 3 is used to assemble the outer diameter space coordinate model of the rotor 7 and the inner diameter space coordinate model of the stator 8, calculate the dimensional difference between the contour paths of the rotor 7 and the stator 8, and obtain the air gap value of the generator stator and rotor 7. Select the calculated air gap values in the up, down, left, and right directions of the stator 8 and the rotor 7, record them, and calculate whether the absolute value of the difference between the calculated value of the air gap value of the stator and rotor 7 and the average value is less than 0.76 mm to evaluate whether the revised air gap value of the stator and rotor 7 is qualified. If it is unqualified, the relative position of the stator and rotor 7 can be changed by grinding the contact surface of the support bearing or adjusting the bottom load gasket of the generator stator 8. If it is qualified, the generator rotor 7 can be reinstalled.

[0055] The present invention proposes a measurement method for measuring the air gap of a generator based on laser measurement. Compared with the existing manual measurement method, this method improves the accuracy of dimension measurement through laser measurement means. At the same time, this method can identify abnormal gaps before reinstalling the rotor 7 and make adjustments during reinstallation.

[0056] In some embodiments, as Figure 4 shown, in Step 2.1, a dimensional model of the rotor 7 at the mating part of the rotor 7 and the oil baffle recess is established using a laser measurement device. The laser measurement device includes a target ball 1, a laser tracker 2, a calculation module 3, and a probe 4. The probe 4 is provided on the target ball 1, and the target ball 1 is electrically connected to the laser tracker 2. A space coordinate system is established with the laser tracker 2 as the origin. The laser tracker 2 receives the spatial position when the probe 4 of the target ball 1 moves and records it in a three-dimensional coordinate system. The laser tracker 2 is electrically connected to the calculation module 3; the calculation module 3 determines the contour paths and centers of the stator 8 and the rotor 7 by receiving the spatial coordinates measured by the laser tracker 2.

[0057] The above embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A generator air gap device based on laser measurement, characterized in that: The device includes a target ball, a laser tracker, a computing module and a probe. The probe is arranged on the target ball and is used to measure the spatial position of a rotor and a stator. The target ball is electrically connected to the laser tracker and the laser tracker is used to receive the spatial position of the target ball when it moves and convert it into spatial data. The laser tracker is electrically connected to the computing module and the computing module establishes a spatial model by reading the data of the laser tracker.

2. A method for measuring the air gap of a generator based on laser measurement, characterized in that: The method comprises: Step 1: Measure the radial and axial distances between the oil stopper pockets of the generator rotor and the stator, and measure the axial distance between the end face of the oil stopper pocket of the stator and the shaft shoulder of the generator rotor; Step 2: Establish the rotor outer diameter spatial coordinate model; Step 2.1: extract the rotor from the generator and place it on a rotor bracket, and use a laser measuring device to establish a rotor size model of the rotor and the oil retaining cavity; Step 2.2: Using a laser measuring device to establish a rotor size model of the rotor where the rotor and the stator are matched; Step 2.3: Connect the outer edge of the contour path end face of the rotor size model in step 2.1 and the rotor size model in step 2.2 to obtain the rotor outer diameter space coordinate model. Step 3: Establish the stator inner diameter space coordinate model; Step 3.1: removing the turbine bearing adjacent to the stator, and using a laser measuring device to establish a stator dimension model of the rotor and the oil stopper cavity; Step 3.2: Using a laser measuring device to establish a stator dimension model of the rotor and the stator; Step 3.3: Connect the stator size model in step 3.1 with the outer edge of the contour path end surface of the stator size model in step 3.2 to obtain the stator inner diameter space coordinate model. Step 4: Based on the gap value between the generator rotor and the oil stop pocket and the axial distance between the end face of the oil stop pocket and the generator rotor shoulder measured in step 1, use a laser measuring device to assemble the rotor outer diameter spatial coordinate model and the stator inner diameter spatial coordinate model, and calculate the rotor-stator air gap value of the assembled model.

3. The method for measuring the air gap of a generator based on laser measurement according to claim 2, characterized in that: The step 1 of measuring the horizontal and vertical distances between the generator rotor and the stator oil stop recess specifically includes: Step 1.1: Remove the outer oil baffle of the generator bearing, mark the leftmost horizontal part of the rotor where the rotor and the oil baffle groove fit as point a, rotate 90 degrees and 180 degrees counterclockwise respectively, and mark points b and c; Step 1.2: Use an inside micrometer to measure the clearance between the rotor and the oil stopper cavity at points a, b and c respectively, and record the measurement results. Also measure and record the axial distance between the end face of the oil stopper cavity and the rotor shoulder.

4. The method for measuring the air gap of a generator based on laser measurement according to claim 3, characterized in that: In the step 2.1, a laser measuring device is used to establish a rotor size model of the rotor and the oil stop pocket. The laser measuring device includes a target ball, a laser tracker, a computing module and a probe. The target ball is provided with a probe. The target ball is electrically connected to the laser tracker. A spatial coordinate system is established with the laser tracker as the origin. The laser tracker receives the spatial position of the probe of the target ball when it moves and records it in a three-dimensional coordinate system. The laser tracker is electrically connected to the computing module. The computing module determines the contour path and the center of the stator and the rotor by receiving the spatial coordinates measured by the laser tracker.

5. The method for measuring the air gap of a generator based on laser measurement according to claim 4, characterized in that: The step 2.1 of using a laser measuring device to establish a rotor size model at the point where the rotor and the oil stop pocket fit together specifically includes: arranging a laser tracker at the rotor attachment, rotating the target ball along the outermost circumferential direction of the rotor at the point where the rotor and the oil stop pocket fit together, and stopping once every rotation of a certain angle; the laser tracker records the spatial coordinates of the outer circumference of the rotor during the measurement process, and the calculation module establishes a rotor size model at the point where the rotor and the oil stop pocket fit together according to the measurement results.

6. The method for measuring the air gap of a generator based on laser measurement according to claim 5, characterized in that: In the step 2.2, a laser measuring device is used to establish a rotor size model at the fitting point of the rotor and the stator, which specifically includes: keeping the position of the laser tracker unchanged, rotating the target ball along the outermost circumferential direction of the rotor at the fitting point of the rotor and the stator, and stopping once every rotation of a certain angle; the laser tracker records the spatial coordinates of the outer circumference of the rotor during the measurement process, and the calculation module establishes the rotor size model at the fitting point of the rotor and the stator according to the measurement results.

7. The method for measuring the air gap of a generator based on laser measurement according to claim 6, characterized in that: In the step 3.1, a laser measuring device is used to establish a stator size model of the rotor and the oil stop pocket, which specifically includes: arranging the laser tracker on the turbine bearing box, rotating the target ball along the circumferential direction of the stator inner diameter of the rotor and the oil stop pocket, and stopping once every rotation of a certain angle; the laser tracker records the spatial coordinates of the stator inner diameter during the measurement process, and the calculation module establishes the stator size model of the rotor and the oil stop pocket according to the measurement results.

8. The method for measuring the air gap of a generator based on laser measurement according to claim 7, characterized in that: In the step 3.2, a laser measuring device is used to establish a stator size model of the rotor and the stator. Specifically, the steps include: keeping the position of the laser tracker unchanged, rotating the target ball along the circumferential direction of the stator inner diameter of the rotor and the stator, and stopping once every rotation of a certain angle; the laser tracker records the spatial coordinates of the stator inner diameter during the measurement process, and the calculation module establishes the stator size model of the rotor and the stator according to the measurement results.

9. The method for measuring the air gap of a generator based on laser measurement according to claim 8, characterized in that: In the step 2, the target ball is operated to rotate along the outermost circumferential direction of the rotor, and the rotation angle is 30 degrees after each rotation and stop. In the step 3, the target ball is operated to rotate along the circumferential direction along the inner diameter of the stator, and the rotation angle is 30 degrees after each rotation and stop.

10. The method for measuring the air gap of a generator based on laser measurement according to claim 9, characterized in that: The rotor size model at the matching place between the rotor and the oil stop pocket includes the rotor contour path and the center of the contour path at the matching place between the rotor and the oil stop pocket; the rotor size model at the matching place between the rotor and the stator includes the rotor contour path and the center of the contour path at the matching place between the rotor and the stator; the stator size model at the matching place between the rotor and the oil stop pocket includes the stator inner diameter contour path and the center of the contour path at the matching place between the rotor and the oil stop pocket; the stator size model at the matching place between the rotor and the stator includes the stator inner diameter contour path and the center of the contour path at the matching place between the rotor and the stator; the calculation of the rotor-stator air gap value of the assembled model in the step 4 specifically includes: calculating the size difference between the rotor contour path and the stator contour path to obtain the stator-rotor air gap value of the generator.

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