Assembly method of multi-segment stator

Abstract

A method for determining a re-adjustment value in terms of the position and / or orientation of a stator segment (101) of a multi-segment stator of an electric machine is described, the stator segment to be assembled together with a shaft (103), the method comprising: using a camera system (105) to detect the position of a plurality of first reference objects (107a, 107b, 107c) attached to the stator segment (101); using a laser tracking system (109) to detect the position of a plurality of second reference objects (111a, ..., 111f) attached to the shaft (103); using the laser tracking system (109) to detect the position of a plurality of third reference objects (113a, 113b) attached to the camera system (105); and determining a re-adjustment value (121) in terms of the position and / or orientation of the stator segment (101) based on the positions of the plurality of first, second and third reference objects.

Description

Technical Field

[0001] The invention relates to a method and an arrangement for determining re-adjustment values ​​in terms of position and / or orientation of stator segments of a multi-segment stator of an electric machine. In addition, the invention relates to a method of assembling stator segments of such a multi-segment stator together with a shaft and further to a method of assembling a multi-segment stator of an electric machine. Background Art

[0002] Building an electric machine such as a generator or a motor requires assembling a stator, and further assembling a rotor and putting the stator and rotor together. As electric machines are now becoming larger and larger, stators are conventionally assembled from multiple stator segments. Multiple stator segments need to be assembled correctly. Assembling multiple stator segments requires correctly adjusting or aligning or arranging those stator segments with respect to position and / or orientation.

[0003] Conventionally, photogrammetry systems have been used to measure the position of the stator segments. Furthermore, the values ​​of the rotor housing of the rotor are conventionally entered into an Excel table, in which the operator finds out how much each corner of each stator segment needs to be moved. Conventionally, after adjusting all segments of the stator, the entire stator is measured again with photogrammetry to verify that the adjustment has worked as intended. Therefore, conventional systems work in an iterative manner, and the results of the readjustment can only be verified when the next complete measurement has been performed.

[0004] It has been observed that, when the generator becomes larger, conventional measurement systems often deliver results without being sufficiently accurate compared to assembly tolerances. When the stator segments are not correctly arranged or assembled with respect to position and / or orientation, collisions with the rotor may occur, or at least deviations from the desired air gap size of the rotor on which a plurality of magnets are mounted. Furthermore, it has been observed that the assembly process is very time consuming, since conventional measurements only provide position results after each iteration of the production process, in which the adjuster block is changed based on the first measurement. Therefore, the operator does not know the result of the adjustment process until the next measurement has been performed. This conventionally leads to multiple iterations of adjustment and measurement, which is very time consuming.

[0005] Therefore, there may be a need for a method and arrangement for determining a readjustment value for the position and / or orientation of a stator segment of a multi-segment stator of an electric machine, which is to be assembled with a shaft, wherein the accuracy of correct assembly with respect to the position and / or orientation is improved while reducing the time required compared to conventional methods and systems. Summary of the invention

[0006] Advantageous embodiments of the invention are described below.

[0007] According to an embodiment of the present invention, a method for determining a readjustment value in terms of the position and / or orientation of a stator segment of a multi-segment stator of an electric motor is provided, wherein the stator segment is to be assembled together with a shaft, the method comprising: using a camera system to detect the positions of a plurality of first reference objects attached to the stator segment; using a laser tracking system to detect the positions of a plurality of second reference objects attached to the shaft; using a laser tracking system to detect the positions of a plurality of third reference objects attached to the camera system; and determining the readjustment value in terms of the position and / or orientation of the stator segment based on the positions of the plurality of first, second and third reference objects.

[0008] The method may be performed by an arrangement for determining a readjustment value according to an embodiment of the invention. The method may be implemented partly in software and / or hardware. The readjustment value may relate to a value regarding a position and / or a value regarding an orientation of a stator segment. The readjustment value may be given, for example, in length units and / or in angle units such as degrees. The multi-segment stator may have a substantially cylindrical shape. The electrical machine may be a generator or a motor. In particular, the electrical machine may be a generator of a wind turbine.

[0009] The stator segments may comprise ferromagnetic material, in particular soft ferromagnetic material with high magnetic permeability. The complete stator may further comprise one or more (e.g. three-phase) winding sets wound around teeth comprised in each stator segment or through slots comprised in each stator segment. The shaft may also have a cylindrical shape and may comprise a central axis, in particular an axis of symmetry. Each stator segment is to be assembled with the shaft and then, after successful positioning, must be mounted thereon.

[0010] The first reference object and also the second reference object and also the third reference object may be objects that are easily visible by imaging the object using one or more cameras of the camera system. The reference objects may be active reference objects - such as light sources, or may be non-active reference objects - such as specific reflectors (such as cat's eye reflectors). The reference objects may have a relatively small (lateral) extension or size, such as, for example, between 0.5 mm and 10 mm, and may have an even smaller thickness, such as between 0.01 mm and 1 mm. All reference objects may be attached to the respective stator segments or shafts or camera systems at predetermined positions. By detecting the position of the reference objects, the position and orientation of the entire objects to which they are respectively attached - i.e. the stator segments, shafts and camera systems - may be derived and derived by the method.

[0011] For example, the first reference objects may all be attached to the radially outer surface of the respective stator segment, in particular also including a first reference object at each corner (or edge) of the stator segment. The second reference objects may be attached at the radially outer surface of the shaft, in particular including at least some of the second reference objects, which are arranged in the same plane perpendicular to the axis of the shaft. The third reference object may also be attached to the camera system (the frame or housing of one or more cameras of the camera) at a predetermined position.

[0012] The laser tracking system may include a laser source for generating a laser beam, a goniometer for guiding the laser beam in a specific direction and for measuring an angle of direction, in particular two angles (e.g., of a spherical coordinate system). For example, the laser tracking system may further include a distance measurement capability using a laser beam and an interferometer. Thus, the laser tracking system is enabled to determine the three-dimensional position of each third reference object and each second reference object. The camera system does not need to acquire image data from the axis. Only the position and / or orientation of the axis can be detected using the laser tracking system. Since the laser tracking system also detects the positions of multiple third reference objects attached to the camera system, a position and orientation relationship between the position and orientation of the camera system and the position and orientation of the axis can be established. Therefore, the relative arrangement of the stator segment relative to the axis can also be established or derived by this method. Thus, it can be determined whether the stator segment is positioned and oriented in a desired or target position and orientation, in particular relative to the axis. Thus, a re-adjustment value, i.e., a value according to which the stator segment is to be rearranged (to produce a target position and / or orientation), can be easily determined. Furthermore, accuracy can be improved because the laser tracking system is enabled to determine the position of relatively distant objects with high accuracy, whereas the camera system can provide position data with decreasing accuracy for increasingly distant objects. Thus, the position of the axis will not yet be determined with such high accuracy using a camera system as compared to using a laser tracking system.

[0013] According to an embodiment of the invention, the method further comprises determining a position and an orientation of the axis of the shaft based on positions of a plurality of second reference objects, wherein determining the re-adjustment value is further based on the determined position and orientation of the axis of the shaft.

[0014] The axis of the shaft may be the axis of cylindrical symmetry of the shaft.In a fully assembled electrical machine, such as a generator, the axis of the shaft may further coincide with the axis of the electrical machine rotor, in particular an outer rotor, to which, for example, permanent magnets are attached.

[0015] The second reference objects can be arranged, for example, around the outer surface of the shaft, in particular in one or several planes perpendicular to the axis of the shaft, at equal distances in the circumferential direction. For example, the arithmetic mean of the (e.g. 3D) positions of all second reference objects can define the position of the axis of the shaft in the plane. It can then be inferred that the axis is perpendicular to the plane. Alternatively or additionally, measuring the second reference objects in several (axially spaced) planes also enables the direction of the axis to be derived. The outer surface of the stator segment (or any other point) can, for example, be intended to be arranged at a specific distance from the axis of the shaft. Therefore, knowing the position and / or orientation of the axis can easily allow the readjustment value to be determined.

[0016] According to an embodiment of the invention, the camera system comprises at least two or three or four cameras or more, each camera acquiring 2D image data from the stator segment from a different viewing area, wherein detecting the positions of the plurality of first reference objects comprises 3D reconstruction of the volumetric portion including the first reference objects based on the 2D image data of each of the at least two cameras.

[0017] The one or more cameras may be visible light sensitive cameras, each camera comprising, for example, a two-dimensional array of photosensitive elements. The cameras may be sensitive to electromagnetic radiation of different spectral ranges, such as infrared, visible light, ultraviolet light and combinations thereof. The two or more cameras may be arranged at different positions and may be arranged in different or the same orientations. Thus, different cameras may view the stator segments from different viewing directions and / or positions. The first reference object may, for example, be imaged as a relatively bright feature in the image. The first reference object may be searched in the image or the reconstructed 3D volume by, for example, any peak detection method. The 3D reconstruction may, for example, comprise back-projection of two-dimensional images using different cameras, or may also involve Fourier techniques. Since the position of the camera system (in particular each camera included in the camera system) is known from the detection of the position of a third reference object using a laser tracking system, which also determines the position of the second reference object on the shaft, a positional relationship between the shaft and the stator segments may be established.

[0018] According to an embodiment of the invention, the plurality of first reference objects comprises at least 9, in particular between 9 and 100 or more first reference objects, which are in particular attached to the radial outer surface of the stator segment, and / or wherein the plurality of second reference objects comprises at least 3, in particular between 3 and 6 or more second reference objects, at least 3 of which are arranged in the same plane perpendicular to the axis of the shaft, and / or wherein the plurality of third reference objects, in particular for each camera of the camera system, comprises at least 4 or more third reference objects, wherein the first and / or second and / or third reference objects in particular comprise light reflectors attached using an adhesive.

[0019] The first reference objects may, for example, comprise three first reference objects or more than three (such as four, five, six or even more) objects in each plane (one or more) perpendicular to the cylindrical axis of the corresponding stator element. As an example, the first reference objects may be arranged in three axially spaced apart planes, each plane having three first reference objects. In particular, all first reference objects may be visible and imaged by all cameras of the camera system. The second reference objects may be arranged around the outer circumference of the shaft, for example at the same angular distance from each other. If it is assumed that the placement of the shaft and the second reference objects is cylindrically symmetrical, detecting three such second reference objects will be sufficient in order to determine the position and orientation of the axis of the shaft.

[0020] The camera system may comprise one or more cameras at fixed relative positions and orientations. In this case, it may be sufficient to apply, for example, four third reference objects (e.g. arranged at the four corners of the camera system). The viewing angles of all cameras included in the camera system may then be derived from the predetermined relative positions of all cameras within the camera system (and the pre-known orientations of the cameras within the camera system) and the positions of the at least four third reference objects.

[0021] The method may be simplified by using a light reflector as a reference object, which is attached using an adhesive.

[0022] According to an embodiment of the present invention, the laser tracking system is configured to detect positions of the plurality of second and third reference objects by detecting two angle values ​​and a distance value of each of the second and third reference objects.

[0023] The laser tracking system may comprise a goniometer for measuring the direction of a laser beam emitted by the laser tracking system. Thereby, the goniometer allows the determination of two angles such as spherical angles. Further having a distance value (towards the detected reference object) determined by the laser tracking system allows the determination of the three-dimensional coordinates of the corresponding detected reference object.

[0024] According to an embodiment of the present invention, the camera system and / or the laser tracking system is configured to acquire measurement data at a rate between 1 Hz and 10 Hz or more. When the camera system and / or the laser tracking system has a relatively high acquisition rate, the assembly process can be accelerated. In particular, the assembly process may resemble a real-time process in which, after a slight rearrangement, the measurement results are immediately available.

[0025] According to an embodiment of the invention, determining the re-adjustment value in the position and / or orientation of the stator segments is further based on: a target geometry of the stator, and / or a target position and orientation of the stator segments relative to the shaft.

[0026] The target geometry may be related to the geometry of the complete stator outer surface.The target position and orientation of the stator segments may, for example, comprise a definition of a distance between the axis of the shaft and the outer surface of the respective stator segment.

[0027] According to an embodiment of the invention, the target geometry of the stator segments and / or the target position and orientation of the stator segments relative to the shaft are derived from geometry data of a rotor, in particular an outer rotor, of the electrical machine, which rotor is to be assembled with the complete stator.

[0028] Ideally, the rotor may have a radially inner surface of, for example, (at least substantially) cylindrical shape. However, due to manufacturing tolerances or errors, the radially inner surface of the rotor may not exactly correspond to a cylinder. The rotor may have different radii at different circumferential (and / or axial) positions, in particular. In order to avoid collisions between parts of the rotor and the complete stator, the target geometry of the stator may be defined so as to have a maximum diameter that is smaller than the minimum radially inner diameter of the rotor (e.g., up to the drive air gap). Thus, the stator can be assembled in a shape that is individually defined for a specific rotor. Thus, the method can be applied to rotors of different shapes.

[0029] According to an embodiment of the invention, the geometric shape data of the rotor in particular at least include data indicating or defining the minimum diameter of the rotor. Using, for example, reconstructed two-dimensional image data or using laser tracking data, the 3D coordinates of the corresponding reference objects can be easily determined. Internally, the method can not only work with the corresponding 3D coordinates of all reference objects, but also the geometric shape or shape data of the corresponding stator segment and / or shaft and / or rotor.

[0030] According to an embodiment of the invention, the stator segments are shaped as cylindrical segments, spanning between 20° and 180°; and / or wherein the shaft has a cylindrical shape. The stator can, for example, be assembled from two, three, four, five, six or even more individual stator segments. Thus, relatively large electrical machines and corresponding stators can also be assembled and constructed by applying the method. In other embodiments, the shaft can differ from a cylindrical shape, for example have a square, rectangular or oval cross section.

[0031] According to an embodiment of the present invention, a method for assembling a stator segment of a multi-segment stator of an electric machine together with a shaft is provided, the method comprising: performing a method for determining a re-adjustment value in terms of position and / or orientation of a stator segment of the multi-segment stator according to one of the aforementioned embodiments; changing the position and / or orientation of the stator segment according to the re-adjustment value; and installing the stator segment to the shaft if the re-adjustment value in terms of position and / or orientation is below a threshold value.

[0032] Changing the position and orientation may be performed manually, for example by applying inserting suitable spacer elements or distance changing elements. In other embodiments, changing the position and orientation may be performed using a hydraulic and / or electric motor manipulator system that holds the stator segments and is enabled to move the stator segments to a predefined or desired length extension and to rotate the stator segments around a desired axis with a desired angle.

[0033] The method of determining a readjustment value and changing the stator segment position and / or orientation may be performed in an iterative manner until the readjustment value is below a threshold value, or until the achieved stator segment position and / or orientation is equal to a target position and / or orientation, or deviates from the target position and / or orientation by only a tolerable amount.

[0034] According to an embodiment of the present invention, a method for assembling a multi-segment stator of an electric machine is provided, the method comprising: performing the method of assembling the stator segments of the multi-segment stator together with a shaft for all stator segments according to the aforementioned embodiment, wherein in particular the laser tracking system and / or the camera system is fixed; and assembling the multi-segment stator together with a rotor, in particular an outer rotor, the outer rotor in particular comprising a plurality of mounted permanent magnets.

[0035] After the first stator segment has been assembled with the shaft, the system of stator segments that have been assembled with the shaft may be rotated to bring the next stator segment to be assembled into the field of view of the tracking system and the camera system.

[0036] In other embodiments of the invention, an emerging stator comprising a stator segment already assembled with a shaft may remain stationary and the camera system and laser tracking system may be rotated or moved to the next position where the next stator segment is to be assembled.

[0037] It should be understood that the features of the method of determining the position and / or orientation of the stator segments of a multi-segment stator of an electric machine disclosed, described, explained or provided, alone or in any combination, are also applicable, alone or in any combination, to the arrangement of determining the readjustment values ​​according to an embodiment of the present invention, and vice versa.

[0038] According to an embodiment of the present invention, an arrangement is provided for determining a re-adjustment value in terms of position and / or orientation of a stator segment of a multi-segment stator of an electric motor, the stator segment to be assembled together with a shaft, the arrangement comprising: a camera system configured to detect the position of a plurality of first reference objects attached to the stator segment; a laser tracking system configured to: detect the position of a plurality of second reference objects attached to the shaft; detect the position of a plurality of third reference objects attached to the camera system; and a processor configured to determine the re-adjustment value in terms of position and / or orientation of the stator segment based on the positions of the plurality of first, second and third reference objects.

[0039] The aspects defined above and further aspects of the invention are apparent from the examples of embodiment to be described hereinafter and explained with reference to the examples of embodiment.The invention will be described in more detail hereinafter with reference to examples of embodiment but to which the invention is not limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Embodiments of the present invention will now be described with reference to the accompanying drawings. The present invention is not limited to the embodiments shown or described.

[0041] Figure 1 Schematically illustrates in front view an arrangement for determining readjustment values ​​in terms of position and / or orientation of stator segments of a multi-segment stator of an electrical machine according to an embodiment of the invention when performing a method according to an embodiment of the invention;

[0042] Figure 2 Schematically illustrates in perspective view an arrangement according to another embodiment of the invention for determining readjustment values ​​with respect to the position and / or orientation of a stator segment of a multi-segment stator of an electrical machine when performing a method according to an embodiment of the invention;

[0043] Figure 3 A method according to an embodiment of the present invention is schematically illustrated. DETAILED DESCRIPTION

[0044] The illustrations in the drawings are in schematic form. Note that in different figures, similar or identical elements in structure and / or function are provided with the same reference numerals or reference numerals that differ only within the first digit. The description of an element not described in one embodiment can be taken from the description of the element in relation to another embodiment.

[0045] An arrangement 100 for determining a readjustment value in terms of a position and / or orientation of a stator segment 101 of an electric machine (not fully illustrated), wherein the stator segment 101 is to be assembled together with a shaft 103, comprises a camera system 105 configured to detect the position of a plurality of first reference objects 107a, 107b, 107c attached to the stator segment 101. The arrangement 100 further comprises a laser tracking system 109 configured to detect the position of a plurality of second reference objects 111a, ..., 111f attached to the shaft 103. The laser tracking system 109 is further configured to detect the position of a plurality of third reference objects 113a, 113b attached to the camera system 105. Thereby, a laser beam 110 is generated and emitted in a specific direction related to distance and angle measurement.

[0046] The arrangement 100 further comprises a processor 115 which receives data from the camera system 105 and from the laser tracking system 109 via control and signal lines 117 and is configured to determine readjustment values ​​in terms of the position and / or orientation of the stator segment 101 based on a plurality of first (107a, 107b, 107c), second (111a, ..., 111f) and third (113a, 113b) reference objects.

[0047] exist Figure 1 , an arrangement 100 is depicted in a front view along the axis 119 of the shaft 103, the arrangement 100 comprising a stator segment 101 to be assembled currently and other stator segments 102, 104 to be assembled later, and comprising a shaft 103, the axis 119 of which will coincide with the rotor axis of the complete generator. The arrangement 100 is configured to perform a method of determining a re-adjustment value in terms of position and / or orientation of a stator segment 101 of a multi-segment stator of an electrical machine.

[0048] After the tracking system 109 has determined the positions of the second reference objects 111a, 111b, ..., 111f, the position of the shaft axis 109 is determined based on the positions of the plurality of second reference objects 111a, ..., 111f. Then, a readjustment value, exemplarily depicted as a translation arrow 121, is determined based on the position and orientation of the axis 119 of the shaft 103. After the measurement has been performed, the stator segment 101 can actually be displaced or moved according to the readjustment value 121 (which can also include a definition of intended rotation or rotation).

[0049] exist Figure 1 In the embodiment illustrated in , the camera system 105 includes two cameras 123a, 123b in one horizontal plane and two other cameras (not shown) in another horizontal plane, which are arranged in fixed relative positions in a frame 125 (e.g., made of warp-resistant carbon) or supported by a frame 125 (e.g., made of warp-resistant carbon). A total of four cameras including the two cameras 123a, 123b have slightly different viewing angles and image each of the first reference objects 107a, 107b, 107c. The 3D construction can then reconstruct a volumetric portion including the first reference objects 107a, 107b, 107c based on the 2D image data acquired by the two (or more) different cameras 123a, 123b. In other embodiments, more than two cameras may be provided to even more increase the accuracy or position determination.

[0050] As from Figure 1It can be appreciated that the first reference objects 107a, 107b, 107c are arranged at the radially outer surface 127 of the stator segment 101 and are also arranged in a plane of the drawing that coincides with a plane perpendicular to the axis 119 of the shaft. The second reference objects 111a, ..., 111f are arranged at the outer radial surface 129 of the shaft 103 and are also arranged in the same plane perpendicular to the axis 109 of the shaft 103.

[0051] According to an embodiment of the invention, the stator segment 101 is to be assembled with the shaft 103 such that the radius r, ie the distance between the axis 119 of the shaft 103 and the stator segment outer surface 127 is smaller than the smallest radius of the rotor to be assembled with the complete stator.

[0052] As from Figure 1 It will be appreciated that the stator segments span an angular region of approximately 30°. In other embodiments, the stator segments may span another angular range. Figure 1 It is understood that the shaft 103 has a cylindrical shape and is particularly shaped as shown in FIG. Figure 1 The shape depicted in also extends in the axial direction (the direction of the axis 119). After the correct position of the stator segment 101 has been adjusted, the assembly consisting of the shaft and the mounted stator segment can be rotated (clockwise or counterclockwise) and the next stator segment (i.e. stator segment 102 or 104) can be correctly aligned or readjusted before also mounting that stator segment to the shaft 103. The stator segments can be mounted using bolts or a frame or a rod or the like.

[0053] Figure 2 An arrangement 200 for determining a rescaling value according to another embodiment of the present invention is schematically illustrated in a perspective view. Figure 1 and Figure 2 In the drawings, similar elements in structure and / or function are marked with the same reference numerals, differing only in the first digit. The description of an element that is not described in detail with reference to a specific embodiment can be obtained from the description of the element in another embodiment or figure.

[0054] The shaft 203 has four second reference objects 211a, 211b, 211c, 211d attached, instead of Figure 1, 107i. The laser tracking system 209 detects the positions of all four second reference objects 211a, ..., 211d. In addition, the tracking system 209 also detects the positions of third reference objects 213a, 213b, 213c, 213d of the camera system 205. Each camera 223a, 223b, 223c, 223d of the camera system 205 covers at least a viewing range 231 including six first reference objects 107a, ..., 107i at the stator segment 201. These reference objects 107a, ..., 107i are grouped into three groups of reference objects, each group including a first reference object arranged in a plane perpendicular to the axis 219 of the shaft 203.

[0055] The arrangement 200 is enclosed in an enclosure 214 which also includes a processor and a viewing screen 204 which can be viewed by an operator 206. In addition, an input module 216 is provided for allowing the operator 206 to start or stop the measurement process.

[0056] The arrangement may include a robot for calibrating the four cameras. For this purpose, a ruler is placed into the measurement volume or viewing area and imaged by all cameras. Additionally, an artifact with a reference object placed on the stator segment may be imaged in order to know the position for photogrammetry. Using the artifact image, the data from the laser tracker and the data from the camera system can be mapped (linked) to each other.

[0057] The arrangement 200 further comprises a rotating table 233 on which the stator segments 201, 202 and the shaft 203 are placed. The rotating table 233 is rotatable to allow different stator segments to be assembled with the shaft 203 to be successively brought into the viewing range 231 of the camera system 205. When all stator segments 201, 202 are mounted to the shaft 203, the stator 212 is formed.

[0058] According to an embodiment of the invention, the measurement system 100 or 200 may return real-time feedback to the automatic adjustment / manipulator system. An overall control (e.g., hardware and / or software) may handle all data from the measurement and manipulator systems. The measurement system may consist of two different measurement tools, a laser tracking system for basic alignment between a fixed axis and two scanners (e.g., cameras) that may detect the surface of the stator segment. The system (e.g., an arrangement for determining readjustment values) may be able to take into account changes in values ​​from many different parameters (e.g., rotor housing data, stator plate data, magnetic pull, airbag target, or final generator) so that an optimal position of the segment may be achieved.

[0059] The output values ​​of the measurement system (e.g., stator size, position of each corner of each segment) can be stored (e.g., in an electronic storage device accessible to processor 115, see ) along with data from incoming parts (e.g., rotor housing, stationary shaft, and stator plate) and other important process data (e.g., date, time, production order ID, temperature of the segment, magnet pool). Figure 1 ) so that some input variables (e.g. magnetic pull) may change when the data is combined with the final air gap of the finished generator.

[0060] The measurement hardware, such as the camera system 105 and the laser tracking system 109, may have a fixed position on the ground, and the stator to be measured may be rotated in steps so that the system can measure and align only one stator segment at a time.

[0061] Figure 3 A method according to an embodiment of the invention is schematically illustrated. In element 301, data from a supplier of the rotor housing (and stator plates, magnets, fixed shaft) is obtained, for example from a computer or network cloud 303. The data is provided to a human machine interface (HMI) and a controller 305, which contains prediction templates and performs machine learning. A measurement system 307 (e.g., implemented as Figure 1 or Figure 2 306 . The stator is schematically shown and labeled with reference numeral 309. The segment adjustment tool 311 obtains the data and provides it to the HMI controller 305. After the realignment and assembly are completed, the final stator data is stored on the server 313, such as in the cloud 315. As a further opportunity, the stator adjustment process statistics can be exported and stored in element 317, and the actual air gap can be evaluated in element 319 compared to the predicted air gap. The system can be operated by an operator 321 who has been provided with a computing system 323. The HMI controller 305 performs the stator adjustment process monitoring and feedback loop 306.

[0062] Embodiments that combine two different measurement tools for measuring stator magnet position and / or orientation can produce higher accuracy than achieved in conventional measurement systems. Figure 3 The processor 115 in the system may provide unique programming that can feed back the current position of each segment within a few milliseconds, which enables the adjustment process to be performed with greater accuracy. Instead of fixing the measurement hardware and rotating the stator, it may be possible to fix the stator and then move the measurement system hardware around the part being measured. Thus, for each movement of the measurement system hardware, the system must be realigned. Another alternative is to use multiple laser trackers on all high pedestals, but this has not been shown to have any degree of uncertainty.

[0063] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Elements described in association with different embodiments may also be combined. It should also be noted that reference signs in the claims should not be interpreted as limiting the scope of the claims.

Claims

1. A method for determining a re-adjustment value in terms of position and / or orientation of a stator segment (101) of a multi-segment stator of an electric machine, said stator segment being to be assembled with a shaft (103), said method include: detecting positions of a plurality of first reference objects (107a, 107b, 107c) attached to the stator segment (101) using a camera system (105); detecting positions of a plurality of second reference objects (111a, ..., 111f) attached to the shaft (103) using a laser tracking system (109); detecting the positions of a plurality of third reference objects (113a, 113b) attached to the camera system (105) using a laser tracking system (109); determining a re-adjustment value (121) in terms of the position and / or orientation of the stator segment (101) based on the positions of the plurality of first reference objects, the second reference object and the third reference object; and determining the position and orientation of the axis (110) of the shaft (103) based on the positions of a plurality of second reference objects (111a, ..., 111f), Wherein determining the re-adjustment value (121) is further based on the determined position and orientation of the axis (119) of the shaft (103).

2. The method according to claim 1, wherein the camera system (105) comprises at least two or three or four cameras or more cameras (123a, 123b), each camera acquiring 2D image data from the stator segment (103) from a different viewing area and / or angle, Wherein detecting the positions of the plurality of first reference objects (107a, 107b, 107c) comprises performing a 3D reconstruction of a volume portion including the first reference objects (107a, 107b, 107c) based on 2D image data of each of the at least two cameras (123a, 123b).

3. The method according to claim 1 or 2, wherein the plurality of first reference objects (107a, 107b, 107c) comprises at least 9 or more first reference objects, the first reference objects being attached to a radially outer surface (127) of the stator segment (101), and / or wherein the plurality of second reference objects (111a, ..., 111f) include at least three or more second reference objects, at least three of which are arranged in the same plane of an axis (119) perpendicular to the axis (103), and / or wherein the plurality of third reference objects (113a, 113b) comprises at least 4 or more third reference objects for each camera of the camera system, Wherein the first and / or second and / or third reference object comprises a light reflector attached using an adhesive.

4. The method according to claim 1 or 2, wherein the laser tracking system (109) is configured to detect the positions of multiple second reference objects (111a, ..., 111f) and third reference objects (113a, 113b) by detecting two angle values ​​and a distance value of each of the second and third reference objects.

5. The method according to claim 1 or 2, wherein the camera system (105) and / or the laser tracking system (109) is configured to acquire measurement data at a rate between 1 Hz and 10 Hz or more.

6. The method according to claim 1 or 2, wherein determining a readjustment value (121) in terms of the position and / or orientation of the stator segment is further based on: The target geometry of the stator, and / or Target position and orientation of the stator segments relative to the shaft.

7. The method according to claim 6, wherein the target geometry of the stator (212) and / or the target position and orientation of the stator segments (201) relative to the shaft (203) are derived from geometry data of a rotor of the electrical machine to be assembled with the complete stator.

8. The method of claim 7, wherein the geometric data of the rotor comprises at least data indicating or defining a minimum diameter of the rotor.

9. The method according to claim 1 or 2, wherein detecting the position of the first and / or second and / or third reference object comprises detecting 3D coordinates of the first and / or second and / or third reference object, respectively.

10. The method according to claim 1 or 2, wherein the stator segments (101) are shaped as cylindrical segments spanning between 20° and 180°; and / or Wherein the shaft (103) has a cylindrical shape.

11. A method for assembling a stator segment (101) of a multi-segment stator (212) of an electric machine together with a shaft (203), the method include: Execution of a method for determining a readjustment value (121) in terms of the position and / or orientation of a stator segment (101, 201) of a multi-segment stator according to any of the preceding claims; changing the position and / or orientation of the stator segments according to the re-adjustment value (121); and If the re-adjustment value in position and / or orientation is below a threshold value, the stator segment (101) is mounted to the shaft (103).

12. A method of assembling a multi-segment stator (212) of an electric machine, the method include: performing the method of assembling a stator segment (101) of a multi-segment stator (212) together with a shaft (203) according to the preceding claim 11 for all stator segments (201, 202), wherein the laser tracking system (209) and / or the camera system (205) are stationary; and A multi-segment stator (212) is assembled with a rotor, wherein the outer rotor includes a plurality of mounted permanent magnets.

13. An arrangement (100, 200) for determining a readjustment value (121) in terms of position and / or orientation of a stator segment (101, 201) of a multi-segment stator (212) of an electrical machine, the stator segment being to be assembled with a shaft (103, 203), the arrangement include: a camera system (105) configured to detect positions of a plurality of first reference objects (107a, 107b, 107c) attached to the stator segment (101); A laser tracking system (109) configured to: detecting positions of a plurality of second reference objects (111a, ..., 111f) attached to the shaft (103); detecting positions of a plurality of third reference objects (113a, 113b) attached to the camera system (105); as well as A processor (115) is configured to determine a re-adjustment value (121) in terms of the position and / or orientation of the stator segment (101) based on the positions of the plurality of first reference objects, the second reference object and the third reference object, and to determine the position and orientation of the axis (110) of the shaft (103) based on the positions of the plurality of second reference objects (111a, ..., 111f), wherein determining the re-adjustment value (121) is further based on the determined position and orientation of the axis (119) of the shaft (103).

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