Mounting magnet module at rotor housing

Abstract

A method of mounting a magnet module (9) at a rotor casing (4) of a rotor (10) of a permanent magnet synchronous machine (1) is described, the method comprising: determining radial distances (r1, r2, r3) between a center point (CP) at a rotation axis (2) and surface measurement positions (s1, s2, s3) at an inner surface (5) of an axial end portion (6) of the rotor casing (4) at a plurality of circumferential positions (cp1, cp2, cp3); selecting a mounting track (81) having a determined radial distance greater than a threshold value from a plurality of magnet mounting tracks (81, 82, 83) extending in the axial direction and spaced apart in the circumferential direction (cd), the selected mounting track (81) in particular having the property of the maximum radial distance (r1); inserting the magnet module (9) in the axial direction (2), in particular from the axial end portion (6), at the selected mounting rail (81); at least the steps of selecting and inserting are repeated for unfilled mounting rails (82, 83) until a plurality of mounting rails are filled with magnet modules (9).

Description

Technical Field

[0001] The present invention relates to a method for installing a magnet module at a rotor shell of a permanent magnet synchronous motor, and also relates to a method for manufacturing the permanent magnet synchronous motor. Background Art

[0002] The generators of wind turbines are extremely large, and their size increases with each new generation of wind turbines. Consequently, the shape of the rotor shell becomes increasingly difficult to control. This can be a particular problem when permanent magnets are inserted into the rotor shell.

[0003] EP2555393 A1 describes a magnet loading device for loading magnetic pole pieces onto the magnetic field of an electric motor, the device comprising: a positioning mechanism, which is implemented to maintain a magnetic pole piece of a plurality of magnetic pole pieces in an appropriate position relative to its designated position on the magnetic field; and a transfer mechanism, which is implemented to simultaneously transfer the plurality of magnetic pole pieces from the positioning mechanism to the magnetic field of the electric motor.

[0004] In conventional magnet installation methods, collisions may occur between the magnets and the stator segments. Conventionally, as a solution, spacers and / or inflatable air cushions are inserted between the rotor housing and the stator segments to avoid collisions or mitigate the impact of the collisions.

[0005] Thus, there may be a need for a method of mounting a magnet module at a rotor housing of a rotor of a permanent magnet synchronous machine, and a method of manufacturing a permanent magnet synchronous machine that mitigates disadvantages observed in conventional methods, particularly reducing collisions. Summary of the Invention

[0006] This need is met by the subject matter according to the independent claim. Advantageous embodiments of the invention are described by the dependent claims.

[0007] According to an embodiment of the present invention, a method for installing a magnet module at a rotor shell of a permanent magnet synchronous motor is provided, the method comprising: determining a radial distance between a center point at the axis of rotation and an inner surface (surface measurement position at the inner surface) located at an axial end portion of the rotor shell at multiple circumferential positions; selecting a mounting track having a determined radial distance greater than a threshold from a plurality of magnet mounting tracks extending in an axial direction and spaced apart in a circumferential direction, wherein the selected mounting track particularly has or is associated with a property of a maximum radial distance; inserting a magnet module at the selected mounting track in an axial direction, particularly from the axial end portion; repeating at least the steps of selecting and inserting for unfilled mounting tracks until a plurality of mounting tracks are filled with magnet modules.

[0008] The electric machine may be configured as a generator that provides, for example, three-phase AC power or provides AC power having more than three phases.

[0009] The rotor shell may have substantially cylindrical symmetry, having a cross section that is circular in shape. The rotor shell may have a diameter, for example, between 5 and 20 meters, and may have a height (or extension in the axial direction), for example, between 5 and 15 meters. Other values ​​are possible. The fully assembled rotor may comprise a rotor shell, a plurality of magnet modules mounted at a plurality of mounting rails, and reinforcement rings, in particular brake discs, mounted at the axial ends of the rotor shell. In particular, the rotor may be an outer rotor, i.e. a rotor that rotates radially outward relative to an inner stator.

[0010] The stator of a synchronous machine may include a ferromagnetic, magnetically permeable laminate with a plurality of teeth arranged, for example, radially outward (for an outer rotor) or radially inward (for an inner rotor). The rotor winding may be wound around the plurality of stator teeth using a distributed winding topology or a concentrated winding topology.

[0011] Each magnet module may include: a base plate; one or more permanent magnets fixed on the base plate; and a cover covering the one or more permanent magnets. When viewed in a radial direction in a cross section, the magnet module may have a substantially rectangular shape.

[0012] The radial distance may correspond to the radius (or distance) from the center point to the inner surface of the rotor shell at an axial end or axial end portion of the rotor shell (surface measurement location at the inner surface). The rotor shell may, for example, extend from one axial end to the other axial end in the axial direction, for example, with the axial end ends being spaced apart from each other in the axial direction by, for example, 5 to 15 meters. The radial direction is perpendicular to the axial direction and also perpendicular to the circumferential direction. The radial distance may, for example, be determined for 20 to 100 circumferential locations across the entire circumference of the rotor shell.

[0013] The radial distance can be determined in particular for surface measurement locations on the inner surface at a plurality of locations where a mounting rail is present or arranged. In particular, the respective surface measurement locations can represent a contact surface on the back side of a base plate of a magnet module. The surface measurement location on the inner surface can in particular represent at least a portion of a contact surface on the back side of a base plate of the axially last magnet module to be mounted or inserted into the respective mounting rail.

[0014] In other embodiments, the last magnet module inserted or to be inserted or mounted at the rotor shell may be slightly offset radially inward from the inner surface for which the radial distance is determined. The inner surface may be a surface portion of the inner surface of the rotor shell that is located axially closer to the axial end of the rotor shell and at which no magnet module would be mounted in a completely populated rotor shell.

[0015] The magnet mounting rails can enable multiple magnet modules to be inserted in the axial direction and can also provide a retaining element or retaining or fixing member to ultimately fix the magnet modules when they are in the correct axial and circumferential positions. Each of the mounting rails can be associated with a specific circumferential position or area. The mounting rails can exist over the entire circumference of the rotor shell.

[0016] The surface measurement location may be at the top (eg, substantially circular front face) of the rotor housing (eg, when the axis of the rotor housing is oriented vertically); the stator may already be connected to / placed with the rotor housing.

[0017] A mounting track having or associated with a property of a maximum radial distance may be associated with or characterized as having or having a maximum radial distance. This mounting track may (or may not) be selected for insertion into a subsequent magnet module.

[0018] The selected mounting track may be among the mounting tracks (referred to as (multiple) large-radius mounting tracks) having a radial distance greater than a threshold value. The threshold value may be defined in different ways depending on the embodiment. For example, the threshold value may be greater than the average value of the radial distances, and / or the threshold value may be greater than 0.9 times the maximum determined radial distance, and / or the threshold value may be defined such that less than 20%, or less than 10%, or less than 5%, or less than 2% of the determined radial distances have a value greater than the threshold value; and / or the selected mounting track (8_1) may not have the property of or be not associated with the maximum radial distance (r1), but may be among the (multiple) large-radius mounting tracks.

[0019] When the inner surface (or the surface measurement position for which the radial distance is to be measured) is respectively located within the considered mounting rail, the radial distance determined for this inner surface can be directly taken into account in order to find the maximum radial distance for a plurality of mounting rails. When the surface measurement position at the inner surface for which the radial distance is determined is not located within the respective mounting rail, the radial distance of the surface within the mounting rail can be estimated, for example by processing and / or interpolating and / or extrapolating a plurality of radial distances available for other portions of the inner surface of the rotor housing, which are located in the vicinity of the region between or within the considered mounting rails.

[0020] Determining the radial distance may comprise performing one or more measurements, in particular optical measurements, and / or performing some measurement signal or measurement data processing.

[0021] The mounting track with the property of the largest radial distance is not yet filled with any magnet module. When repeating at least the steps of selecting and inserting (particularly and determining step), the filled mounting tracks may be disregarded for selecting the respective next mounting track with the property of the largest radial distance.

[0022] The magnet module can be inserted so that the back side of the base plate contacts the portion of the inner surface of the rotor housing within the corresponding mounting track. In particular, for the inner rotor, the permanent magnets, which may be covered with a cover, will then protrude radially inwards. The magnet module can represent a predetermined individual of the magnet module, which may also have been measured in advance (in particular with respect to its respective height or radial extension). One or more of the above-mentioned steps of determining, selecting and inserting can therefore be performed respectively only considering the unfilled mounting tracks, and the corresponding next mounting track among the (multiple) large-radius mounting tracks, in particular the mounting track with the property of the largest radial distance, is selected from the unfilled mounting tracks.

[0023] When repeating one or more of the above steps, the step of determining the radial distance is not necessarily performed in each cycle, as it can be assumed that the corresponding radial distance does not change significantly after the magnet module has been inserted on the selected mounting rail or several selected mounting rails selected during the repeated steps.

[0024] However, according to an embodiment, each time a mounting track has been filled (or only after two or three tracks), determining the radial distance is performed before selecting the next mounting track.

[0025] When the magnet module is inserted into the selected mounting rail, magnetic pull may act between the magnets and the rotor housing, causing slight deformation of the rotor housing. Consequently, after the entire mounting rail has been inserted into the magnet module, the shape of the inner surface of the rotor housing, at least at the axial end portions, may have changed. Consequently, the corresponding radial distances throughout the circumference may have changed, resulting in the next mounting rail being different from the one that would have been selected based on the predetermined step of determining the radial distances.

[0026] Therefore, the selection can be improved and the rotor shell shape can be slightly changed to be closer to a circular or cylindrical shape.Thus, the air gap between the radially inner end of the magnet module and the radially outer end of the stator can be formed to have a more uniform size distribution throughout the entire circumference.

[0027] According to an embodiment of the present invention, the method further comprises repeating the steps of determining, selecting and inserting until all mounting rails are populated with magnet modules.

[0028] When all steps of determining, selecting and inserting are repeated in or for each (repeated) cycle, control of the air gap can still be improved, since the shape of the rotor shell can resemble a cylindrical or circular shape with greater accuracy.

[0029] According to an embodiment of the present invention, determining the radial distance includes: performing optical measurement using an optical measuring device placed at the device position to determine multiple auxiliary distances from the device position to the inner surface of the rotor shell for multiple circumferential positions; and deriving the radial distance based on the multiple auxiliary distances.

[0030] Optical measurement may involve acquiring multiple measurement data regarding the distance from a device location to a surface measurement location on the inner surface of the rotor shell at a radial end. Specifically, the optical measurement device may include two mirrors that can rotate about two perpendicular rotation axes to scan across multiple surface measurement locations (on the inner surface of the rotor shell). The device location does not necessarily need to be located at the center of the entire machine or the rotor shell's rotation axis. This improves flexibility.

[0031] According to an embodiment of the present invention, the optical measurement device comprises at least one of the following: a laser tracker; a laser radar; a LIDAR device. Therefore, the method can be implemented using a commonly available measurement system.

[0032] According to an embodiment of the present invention, inserting the magnet modules includes inserting the magnet modules predetermined for the selected mounting track in an order predetermined for the selected mounting track, thereby arranging the predetermined magnet modules at predetermined axial mounting positions and predetermined circumferential mounting positions.

[0033] The predetermined magnet modules and the predetermined sequence can be predetermined without having to rely on online measurements performed during installation of the magnet modules. The predetermined magnet modules and the predetermined sequence can be obtained based on even more accurate measurements (regarding, for example, the shape of the rotor shell and / or the radial dimensions of the magnet modules).

[0034] According to an embodiment of the present invention, a predetermined axial mounting position and a predetermined circumferential mounting position for the magnet module have been determined in advance based on (optical) measurements (related to shape) of the inner surface of the rotor shell for multiple circumferential positions and multiple axial positions (between an axial end portion and another axial end portion of the rotor shell).

[0035] Optical measurements may also utilize optical measurement devices, such as laser trackers and / or laser radar and / or LIDAR devices.

[0036] The predetermined shape measurements may include further data on the shape of the rotor shell, also in the axial direction, which can be advantageously used to determine the order in which the magnet modules are to be inserted into the mounting rail in the axial direction. Actual shape irregularities of the rotor shell, which represent deviations from a cylindrical shape, can be partially compensated for in the predetermined order by placing magnet modules having a relatively greater height at those axial and circumferential positions of the rotor shell where the rotor shell has a relatively greater radius.

[0037] According to an embodiment of the present invention, the predetermined axial installation position and the predetermined circumferential installation position for the magnet module have also been determined in advance based on the measured height of the magnet module.

[0038] Furthermore, due to manufacturing tolerances, the height (or radial extension) of the manufactured magnet modules may vary (e.g., according to a Gaussian distribution). For example, magnet modules with a lower height can be arranged circumferentially and axially on the rotor shell at a relatively small radius of the rotor shell. Consequently, the gap between the rotor and stator can also be improved in terms of gap size uniformity.

[0039] According to an embodiment of the present invention, a predetermined axial mounting position and a predetermined circumferential mounting position for the magnet module have been predetermined when the internal space of the rotor shell is empty and / or not occupied by the stator and / or when a reinforcement ring, in particular a brake disc, is connected to an axial end portion of the rotor shell.

[0040] When the interior space of the rotor shell is empty, the rotor shell can be measured in an improved manner over substantially its entire axial extension. Furthermore, when performing the above-mentioned measurement, when the reinforcement ring (which is also mounted to the rotor shell in the assembled generator) is present, the shape of the rotor shell can be more accurately compared to the shape of the rotor shell in the assembled generator.

[0041] According to an embodiment of the present invention, inserting the magnet module into the selected mounting track includes: guiding one magnet module after another to the axial end portion at the beginning of the mounting track; sliding one magnet module after another in the mounting track in a direction away from the axial end portion toward the other axial end portion until reaching a predetermined axial position; fixing the magnet module at the corresponding predetermined axial mounting position in the selected mounting track.

[0042] In particular, one or more magnet insertion equipment, devices, or machines may be utilized to perform the method. The method may be performed, for example, with the rotor housing axis oriented substantially vertically. The axial position of each magnet module may be monitored to ensure that the respective magnet module is actually positioned and secured at the intended, predetermined axial position and predetermined circumferential position on the rotor housing.

[0043] According to an embodiment of the present invention, the inner surface at the axial end portion of the rotor shell (the surface measurement location at the inner surface) is substantially at the edge of the rotor shell. The axial end portion may substantially refer to the axial end edge of the rotor shell. The measuring device may, for example, be located, arranged, or fixed to a fixed shaft (e.g., a portion of a stator), for example, close to or at the axis of rotation, such that the measurement locations around the entire circumference are within the measurable area of ​​the device.

[0044] According to an embodiment of the invention, the method is performed with the (inner) stator connected to the rotor via bearings. Thus, it is possible to avoid installing the stator after the magnets have already been installed, which has been observed to be very difficult due to the very small air gap.

[0045] According to an embodiment of the present invention, the method is performed without the reinforcement ring, in particular the brake disc, being connected to the rotor. The reinforcement ring or in particular the brake disc may substantially cover the axial end of the mounting rail, which means that the magnet module cannot be inserted when the reinforcement ring is connected to the axial end of the rotor housing.

[0046] According to an embodiment of the present invention, a method for manufacturing a permanent magnet synchronous motor is provided, the method comprising: providing a rotor shell having a plurality of axially extending magnet mounting tracks at a plurality of circumferential positions on the inner surface of the rotor shell; performing measurements on the shape of the inner surface of the rotor shell and on the height of a plurality of magnet modules so as to determine the installation positions of the plurality of magnet modules; connecting the rotor shell and the stator via bearings; performing the method for installing the magnet modules at the rotor shell according to one of the aforementioned embodiments; and installing a reinforcement ring, in particular a brake disc, at the axial end portion of the rotor shell.

[0047] The electrical machine may be configured as a generator, in particular as a generator of a wind turbine.

[0048] The aspects defined above and further aspects of the invention are apparent from the examples of embodiment to be described hereinafter and are 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

[0049] 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.

[0050] Figure 1 A portion of an electric machine manufactured according to an embodiment of the present invention is schematically illustrated.

[0051] Figure 2 The diagram shows measurement results during determination of the radial distance of the inner surface of the axial end portion of the rotor shell relative to the center point at the rotation axis. DETAILED DESCRIPTION

[0052] The illustrations in the drawings are in schematic form.

[0053] Figure 1 Schematically illustrated in a top view along an axial direction 2 , which is perpendicular to the radial direction 3 and also perpendicular to the circumferential direction cd, is a permanent-magnet synchronous machine 1 comprising a rotor shell 4 of a rotor 10 during the method for mounting a magnet module, the rotor shell 4 having an inner surface 5 which represents a radial inner surface in the illustrated embodiment.

[0054] Initially, all mounting rails 8_1, 8_2, 8_3 are empty and no magnet module 9 is inserted. According to the mounting method, the rotation axis (perpendicular to the magnet module 9) is determined for a plurality of circumferential positions CP1, CP2, CP3. Figure 1 The drawing plane extends through the center point CP) and the center point CP at the axial end portion 6 (basically at Figure 1 The radial distances r1, r2, r3 between the surface measurement positions s1, s2, s3 at the inner surface 5 (at the drawing plane of the rotor shell) are determined over the entire circumference of the rotor shell.

[0055] Respective mounting rails 8_1, 8_2, 8_3, ... are provided between respective retaining members or rail members 7 provided on the inner side of the rotor case 4. The respective mounting rails 8_1, 8_2, 8_3, ... extend in the axial direction 2 and are spaced apart in the circumferential direction cd. Surface measurement positions s1, s2, s3 are located within the mounting rails 8_1, 8_2, 8_3, ...

[0056] The mounting track having the property of the largest radial distance r1, r2, r3, ... is selected from the plurality of mounting tracks 8_1, 8_2, 8_3, ... In other embodiments, the mounting track may be selected from large radius mounting track(s) (having radial distances greater than a threshold).

[0057] In the embodiment shown, the radius r1 is the maximum distance. Thus, during the installation method, a mounting track 8_1 is selected. At the selected mounting track 8_1, the magnet module 9 is inserted from the axial end portion 6.

[0058] exist Figure 1 The last magnet module 9 to be installed can be seen in FIG, but a plurality of other magnet modules have been inserted at other axial positions toward the other axial end of the rotor shell 4. Together with the magnet modules finally inserted into all the mounting rails and including the rotor shell 4, a rotor 10 is formed.

[0059] exist Figure 1In the embodiment illustrated in FIG, radial distances r1, r2, r3, ... are determined by optical measurement using an optical measuring device 11. This optical measuring device 11 is placed at a device position 12 to determine a plurality of auxiliary distances d1, d2, d3 from device position 12 to surface measurement positions s1, s2, s3, ... on the inner surface of rotor housing 4. By appropriately processing the measured distances d1, d2, d3, the corresponding radial distances r1, r2, r3, ... can be derived. In the illustrated embodiment, measuring device 11 is a LIDAR device.

[0060] After the magnet module 9 has been inserted into the selected mounting track 8_1, the step of determining the corresponding radial distance is repeated using the measuring device 11. The radial distance may have changed compared to the initially determined radial distance. In the next step of the installation method, an unfilled mounting track is again selected, now with the attribute of the largest radial distance. In the illustrated embodiment, the next selected mounting track may be mounting track 8_2. The magnet module 9 will then also be inserted into this mounting track 8_2.

[0061] It should be noted that the respective magnet modules 9 inserted into the respective mounting rails are predetermined (individual) modules and are inserted in a predetermined order, as explained above. In order to determine the respective predetermined groups of magnet modules and the respective order of the magnet modules, the heights h1, h2, and h3 of the respective magnet modules 9 may also be predetermined or measured. The heights h1, h2, and h3, etc., may represent the radial extent of the respective magnet modules 9.

[0062] In the illustrated embodiment, the inner surface at the axial end portion 6 of the rotor shell 4 is substantially at the edge 13 of the rotor shell 4 .

[0063] If you can Figure 1 As can be seen in FIG, when the mounting method is performed, the inner stator 14 is connected to the rotor 10 via a bearing not shown. The stator 14 includes teeth not shown in detail, around which a plurality of stator windings are wound. Thus, Figure 1 The stator 14 is only very schematically illustrated in FIG. In the fully assembled generator or electrical machine 1 , in a final manufacturing step of manufacturing the generator, a reinforcement ring or brake disc, not shown, may then be connected or coupled to the axial end 6 or edge 13 of the rotor shell.

[0064] Figure 1 An air gap between the rotor 10 and the stator 14 is indicated in FIG. 1 and is labeled with reference numeral 16 .

[0065] Figure 2 The diagram shows, for example, Figure 1The line marked with reference numeral 15 represents the radial distance r for a plurality of circumferential positions (along the circumferential direction cd), for example, Figure 1 The center point CP shown in the figure is Figure 1 The distances between the surface areas s1 , s2 , s3 , . . . at the inner surface 5 of the rotor housing of the electric machine 1 shown in FIG.

[0066] As can be seen from the measurement curve 15 , the radial distance varies for different circumferential positions, thus deviating from the circular shape. Figure 2 The numbers on the circumference of the outer circle shown in the figure represent the installation track numbers, i.e. Figure 1 The numbers of the corresponding mounting rails 8_1, 8_2, 8_3, ... are shown schematically in FIG. Figure 2 The track with number 11 in the figure may correspond to the initially selected mounting track 8_1, since this track is the one with the property of the largest radial distance r1. After the predetermined magnet modules are installed into this mounting track 8_1 in a predetermined order, the radial distance may be measured repeatedly, and the next unfilled mounting track may be selected, for example corresponding to Figure 1 The mounting rail 8_2 shown in FIG. 8 has the mounting rail number 11.

[0067] According to an embodiment of the present invention, a measuring device (such as a laser radar or a laser tracker) can detect the shape at the upper side (or axial end portion) of the rotor shell. This may indicate that the track numbers 11 / 9-13 (see Figure 2 ) is the first mounting track filled with magnet modules. After the magnet modules are placed, the shape of the rotor housing may change, and another mounting track may have the maximum distance. Here, the next magnet module can be inserted. This process can be repeated until all mounting tracks are filled.

[0068] Embodiments of the present invention may have the following advantages:

[0069] Thanks to real-time measurement of magnet insertion (asymmetric magnetic pull is a major issue affecting magnet shape during insertion), the rotor housing shape can be controlled throughout the insertion and installation process. This speeds up the insertion and installation process and supports the optimal shape for achieving the smallest air gap.

[0070] It should be noted that the word "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Elements associated with different embodiments may also be combined. It should also be noted that the reference signs in the claims should not be understood as limiting the scope of the claims.

Claims

1. A method for installing a magnet module (9) on a rotor shell (4) of a rotor (10) of a permanent magnet synchronous motor (1), the method comprising: determining radial distances (r1, r2, r3) between a center point (CP) at the axis of rotation (2) and surface measurement locations (s1, s2, s3) at the inner surface (5) of the axial end portion (6) of the rotor shell (4) at a plurality of circumferential locations (cp1, cp2, cp3); selecting a mounting track (8_1) having a determined radial distance greater than a threshold value from a plurality of magnet mounting tracks (8_1, 8_2, 8_3) extending in an axial direction and spaced apart in a circumferential direction (cd), wherein the selected mounting track (8_1) in particular has the property of or is associated with a maximum radial distance (r1); Inserting a magnet module (9) at the selected mounting rail (8_1) in the axial direction (2), in particular from the axial end portion (6); At least the steps of selecting and inserting are repeated for unpopulated mounting rails (8_2, 8_3) until a plurality of mounting rails are populated with magnet modules (9).

2. The method according to the preceding claim, in, The threshold is greater than the average value of the radial distances, and / or wherein the threshold is greater than 0.9 times the maximum determined radial distance, and / or wherein the threshold is defined such that less than 20%, or less than 10%, or less than 5%, or less than 2% of the determined radial distances have a value greater than the threshold; and / or The selected mounting track (8_1) does not have the property of a maximum radial distance (r1) or is not associated therewith.

3. The method according to any one of the preceding claims, further comprising: The steps of determining, selecting and inserting are repeated until all mounting rails (8_1, 8_2, 8_3) are filled with magnet modules (9).

4. The method according to claim 1, wherein: Determining the radial distance includes: performing optical measurements using an optical measuring device (11) placed at a device location (12) to determine a plurality of auxiliary distances (d1, d2, d3) from the device location (12) to the inner surface (s1, s2, s3) of the rotor shell (4) for the plurality of circumferential locations; The radial distances (r1, r2, r3) are derived based on the plurality of auxiliary distances (d1, d2, d3).

5. The method according to claim 1, wherein: The optical measuring device (11) comprises at least one of the following: Laser tracker; LiDAR; LIDAR device.

6. The method according to claim 1, wherein: Inserting the magnet module includes: The magnet modules (9) predetermined for the selected mounting track (8_1) are inserted in a sequence predetermined for the selected mounting track, thereby arranging the predetermined magnet modules at predetermined axial mounting positions and predetermined circumferential mounting positions.

7. The method according to claim 1, in, The predetermined axial installation position and the predetermined circumferential installation position for the magnet module have been previously determined based on measurements of a plurality of circumferential positions and a plurality of axial positions of the inner surface of the rotor case.

8. The method according to claim 1, in, The predetermined axial installation position and the predetermined circumferential installation position for the magnet module (9) have also been previously determined based on the measured magnet module heights (h1, h2, h3).

9. The method according to claim 1, in, In the case where the interior space of the rotor housing (4) is empty and / or not occupied by the stator (14), and / or In case a reinforcement ring, in particular a brake disc, is connected to the axial end portion of the rotor shell, The predetermined axial installation position and the predetermined circumferential installation position for the magnet module (9) have been predetermined.

10. The method according to claim 1, in, Inserting the magnet module at the selected mounting track (8_1) comprises: guiding one magnet module (9) after another to the axial end portion (6) where the mounting track (8_1) begins; Sliding one magnet module (9) after another magnet module (9) in the mounting track (8_1) in a direction away from the axial end portion toward the other axial end portion until reaching the predetermined axial position; The magnet module (9) is fixed at a corresponding predetermined axial installation position within the selected installation track.

11. The method according to claim 1, in, The surface measurement positions (s1, s2, s3) at the inner surface (5) of the axial end portion of the rotor shell are substantially at the edge (13) of the rotor shell (4).

12. The method according to claim 1, in, The method is performed with the stator (14) connected to the rotor (10) via bearings.

13. The method according to claim 1, in, The method is performed without a reinforcement ring, in particular a brake disc, being connected to the rotor (10).

14. A method for manufacturing a permanent magnet synchronous motor (1), the method comprising: Providing a rotor shell (1) having a plurality of axially extending magnet mounting tracks (8_1, 8_2, 8_3) at a plurality of circumferential positions at an inner surface (5) of the rotor shell (4); Performing measurements on the shape of the inner surface (5) of the rotor case (4) and on the heights (h1, h2, h3) of the plurality of magnet modules (9) in order to determine installation positions of the plurality of magnet modules; Connecting the rotor housing (4) and the stator (14) via bearings; performing the method for mounting the magnet module (9) on the rotor housing (4) according to one of the preceding claims; A reinforcement ring, in particular a brake disc, is mounted at the axial end portion of the rotor shell.

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