Mounting a magnet module at a rotor housing

Abstract

A method of arranging permanent magnet modules (7) at a substantially cylindrical, in particular an outer rotor housing (6) of an electric machine, in particular a wind turbine generator, is described, the rotor housing (6) extending in an axial direction (3) and a circumferential direction (2) and comprising an axially extending guide structure (4) to provide a plurality of axially magnet module slots (sa, sb, sc,...) spaced apart in the circumferential direction, the method comprising: inserting the magnet modules (7) successively at the slots (sa, sb, sc,...) in a predetermined order of the slots until each slot is occupied by an expected number of magnet modules per slot, wherein the inserting of the magnet modules (7) is performed in an axial layer-wise manner or in a slot-wise manner.

Description

Technical Field

[0001] This invention relates to a method for arranging permanent magnet modules in the rotor housing of an electric motor, a method for manufacturing an electric motor rotor, and a method for manufacturing an electric motor, particularly a wind turbine generator. Background Technology

[0002] Today, generator rotors, such as those in wind turbines, have significantly increased dimensions. Therefore, assembling a generator carries the risk of rotor deformation during assembly, particularly during the insertion of magnet modules.

[0003] EP 2434616A1 discloses a method for determining the magnet arrangement of magnets for an electric motor rotor, wherein the performance parameters of the motor to be adjusted are identified, and the magnets are arranged relative to a reference magnet according to calculated arrangement variables.

[0004] EP 2555393B1 discloses a magnet loading device having a positioning device and a conveying device, the conveying device being adapted to simultaneously convey multiple magnetic pole pieces from the positioning device to the field of an electric motor.

[0005] However, it has been observed that conventional methods for arranging magnet modules at the rotor housing suffer from significant rotor deformation during assembly. Therefore, there may be a need for a method for arranging permanent magnet modules at the rotor housing, a need for a method for manufacturing the rotor housing, and a need for manufacturing the motor in which at least some of the aforementioned problems are alleviated. Summary of the Invention

[0006] This need can be met by the subject matter of the independent claims. The dependent claims describe advantageous embodiments of the invention.

[0007] According to an embodiment of the invention, a method is provided for arranging permanent magnet modules in a substantially cylindrical, particularly outer rotor housing, of an electric motor, particularly a wind turbine generator, the rotor housing extending in both axial and circumferential directions and including axially extending guide structures to provide a plurality of circumferentially spaced axial magnet module slots (e.g., magnet modules are arranged at predetermined axial module positions within the slots), the method comprising: sequentially inserting magnet modules into the slots in a predetermined order until each slot is occupied by a predetermined number of magnet modules for each slot, wherein the insertion of magnet modules is performed axially in a layered manner or in a slot-by-slot manner.

[0008] Each permanent magnet module may include a base such as a substantially rectangular metal plate, a permanent magnet attached to or mounted on the base, and a magnet cover covering the magnet. In particular, all magnet modules to be inserted may be configured to have substantially the same geometry, i.e., in the axial direction, the circumferential direction, and the radial direction.

[0009] The outer rotor housing may have axially extending guide structures disposed in a radially inner portion. The guide structures may include, for example, retaining rails, which may have, for example, a substantially T-shaped shape. Corresponding slots may be formed between circumferentially adjacent guide structures. During rotor assembly, permanent magnet modules can be inserted from one axial end of the rotor housing. In the complete rotor housing on which all permanent magnet modules are mounted, the permanent magnet modules in a slot may be substantially axially adjacent to each other. In other embodiments, axial spacers may be present between adjacent permanent magnet modules.

[0010] During assembly, the magnet module can be pushed along the slot, thereby being guided and its movement constrained by a guiding structure, so that the insertion direction is substantially axially oriented. The cylindrical axis of symmetry of the rotor housing (which can be substantially cylindrically symmetric) can be arranged parallel to or along the axial direction. It may be necessary to position the magnet module at a predetermined axial module location within the slot.

[0011] For example, each slot may be intended to hold five to ten magnet modules, or, for example, between five and twenty magnet modules. The method may, for example, include inserting a certain number of magnet modules in a first slot, and then inserting the same or a different number of modules in the next slot, determined by a predetermined order of the slots. The method may also include specifying how many magnet modules are inserted into which slot in what order.

[0012] The inventors have discovered that rotor housing deformation can be reduced when modules are inserted according to a specific slot sequence and a specific number of modules to be inserted into the corresponding slots. The number of magnet modules inserted sequentially into a slot can, for example, be less than the expected total number of magnet modules for each slot. The remaining magnet modules to be inserted into the slot in question can be inserted after several or more modules have been inserted into another slot (and all the remaining slots), determined by the predetermined slot sequence. When magnet modules are inserted according to the slot sequence and performed axially in a layered or slot-by-slot manner, deformation of the rotor housing and / or generator, or particularly deterioration of eccentricity, can be limited to acceptable tolerances.

[0013] According to an embodiment of the invention, the predetermined order of the slots is determined in advance such that the effect of the inserted magnet module on the deformation and / or eccentricity of the rotor housing and / or generator is at most below a threshold, and shape measurement data is optionally taken into account to change the order of the slots to be filled.

[0014] The slot sequence can be determined based on a physical / mathematical model or simulation that takes into account the magnetic forces acting during assembly. Thus, any deformation or shape change can be monitored by performing one or more measurements (e.g., optical measurements) to determine the axial shape of the rotor housing. For example, the distance between a reference point and a region within the slot, such as the mounting or contact area where the magnet modules within the slot should contact, can be measured. Furthermore, these measurement data can be processed to determine potential deviations from the designed shape of the rotor housing.

[0015] According to an embodiment of the invention, the insertion of magnet modules is performed in an axially layered manner, comprising: defining a predetermined number (less than the expected number of magnet modules in each slot) of one or more magnet modules to be inserted (at each slot) for each of a first axial range (of the slot) and at least one additional axial range, such that the sum of the predetermined number of magnet modules in all the first and at least one additional axial ranges is equal to the expected number of magnet modules in each slot.

[0016] A) Fill the first axial range of each slot with a first predetermined number of one or more magnet modules in a predetermined order;

[0017] B) Fill the additional axial range of each slot with one or more additional predetermined number of magnet modules in a predetermined order;

[0018] C) Repeat B for any remaining axial ranges (not filled with magnet modules) that are other axial ranges.

[0019] The axial layering approach can be a specific way, as discovered by the inventors, to limit any potential deformation of the rotor housing. Therefore, during the method of this embodiment, initially, a first axial range of all slots is filled or occupied by magnet modules according to a predetermined slot sequence, and thereafter, one or more additional axial ranges are again inserted or filled by magnet modules according to the slot sequence. Thus, the first axial range may correspond to the sum of the axial ranges of one or more magnet modules, and the at least one additional axial range may also correspond to the sum of the axial ranges of one or more magnet modules. Therefore, the insertion of magnet modules can be performed or completed circumferentially, layer by layer.

[0020] For example, a complete circumference of all magnetic poles can be completed with one module per pole (or even more modules per pole), followed by a second layer (e.g., one module per pole for a complete circumference), and so on, until the total number of modules to be inserted in each slot of each pole (e.g., seven) is completed. By doing so, the unbalanced magnetic force can be reduced, for example, to one-seventh. However, this embodiment, where exactly one magnet module is inserted in each axial range, may require a particularly long insertion time. Alternatively, to save assembly time, the process can be accelerated by inserting two, three, or four modules in the first circumference, where the risk of deformation is lower, i.e., due to its better fixation at the drive end, followed by inserting one or two modules in the second circumference, and then one circumference of modules until all are inserted. The number of steps can also be adjusted during assembly to find, for example, an optimal combination between the shortest time and the least deformation.

[0021] According to an embodiment of the invention, the predetermined sequence includes the next slot (with one or more magnet modules) to be enriched, immediately adjacent to the last slot that has been previously enriched (with one or more magnet modules).

[0022] The inventors discovered that this sequencing can limit, or even prevent, any potential deformation, and thus essentially maintain the low eccentricity required for the rotor housing and / or generator. After, for example, one or more modules have been inserted into the first slot, one or more modules can subsequently be inserted into the immediately adjacent slot on the circumference, i.e., the next slot. This process can continue in the same similar manner until all slots have been filled with one or more modules to complete an axial layer or axial range. The procedure can then continue to the next axial range or axial layer, inserting the same number of modules (as in the previous layer) or a different number of modules. This can then continue in a similar manner for one or more additional axial ranges or layers until the desired number of modules have been inserted into all slots.

[0023] According to one embodiment of the invention, the predetermined sequence includes filling another axial range starting from the same slot that has already begun filling the previous axial range.

[0024] Therefore, it offers the advantage that, after insertion within the first axial range is completed, the placement device moves precisely to the slot immediately adjacent to the last enriched or filled slot, which is circumferentially close to the last enriched slot. Thus, no insertion device or insertion apparatus needs to change its circumferential position over a large distance.

[0025] According to one embodiment of the invention, the predetermined sequence includes filling a first axial range starting with a first groove that is substantially 0° and continuing with a second groove that is substantially 180°, and / or then iteratively continuing with a groove that is one spaced apart from the first groove, and further continuing with a groove that is one spaced apart from the last enriched groove, and / or then iteratively continuing with the next groove relative to the first groove, and further continuing with the next groove relative to the last enriched groove.

[0026] According to this embodiment, the slots subsequently inserted or filled with one or more magnet modules may not be adjacent to each other, but may be spaced apart by a considerable distance, or may be spaced apart by one slot. The inventors have also found that this arrangement of the slots provides or results in low deformation or even no deformation.

[0027] According to one embodiment of the invention, the predetermined sequence of filling the first axial range is performed as follows: starting with a first groove that is substantially 0°, and continuing with a second groove that is substantially 180°, and / or then continuing to another groove that is substantially one of 90° and 270°, 60° and 120° and 240°, and 45° and 90° and 145°.

[0028] The exact number of angular positions that can be filled one after another can be determined, for example, from physical / mechanical simulations.

[0029] According to embodiments of the invention, the first and / or additional predetermined number of modules are one, two, three, or four (assuming the number of modules to be inserted is less than the number of missing modules). This provides great flexibility and makes it possible to find the optimal balance between insertion time and potential deformation.

[0030] According to embodiments of the invention, each of the first and at least one additional predetermined number of modules is one. The inventors have found that this embodiment results in relatively low or even no deformation of the rotor housing. However, it may require a relatively long insertion time.

[0031] The preceding embodiments described alternatives or improvements to the axial layer-by-layer insertion method. The following describes details or alternatives or improvements to the slot-by-slot insertion method.

[0032] According to an embodiment of the present invention, the insertion of magnet modules is performed in a slot-by-slot manner, comprising: inserting a predetermined number of magnet modules for each slot into a first slot; inserting a predetermined number of magnet modules for each slot into a second slot spaced substantially 180° from the first slot; iteratively inserting a predetermined number of magnet modules for each slot into a slot space skipping one relative to the first slot, and further continuing into slots skipping one relative to the last enriched slot; iteratively inserting a predetermined number of magnet modules for each slot into the next slot space relative to the first slot, and further continuing into the next slot space relative to the last enriched slot.

[0033] According to this embodiment, any slot is always filled with the total expected number of modules to be inserted into that slot, and thereafter, the next slot is filled with the specified magnet modules. A second slot that is substantially 180° (e.g., an azimuth angle) away from the first slot can be considered as a slot that is geometrically substantially opposite to the first slot (e.g., relative to the axis of a cylinder). The angular values ​​that separate the respective slots from each other can correspond to circumferential angle values. The method may include inserting magnet modules every other slot, starting from the first slot and / or starting from the next slot adjacent to the first slot, and then inserting magnet modules every other slot, starting from the next slot after the first slot.

[0034] According to an embodiment of the invention, a magnet module is inserted such that the magnetic orientation of the magnet module alternates in the circumferential direction and is the same in each slot (in the axial direction). Therefore, conventional rotor designs can be supported.

[0035] According to embodiments of the invention, the method further includes, in particular, during or after any magnet module insertion operation: measuring the geometric characteristics of the rotor housing; comparing the geometric characteristics with the design shape of the rotor housing to determine an amount indicating rotor housing deformation; and adjusting, depending on the amount, the sequence of slots to be filled and / or the number of magnet modules to be inserted into a particular slot to counteract any deformation above a threshold.

[0036] Therefore, during the arrangement or assembly process, the shape or geometry of the rotor housing can be monitored, and adjustments can be made to the slot order and / or the number of modules to be inserted.

[0037] According to an embodiment of the present invention, a method for manufacturing a rotor of an electric motor, particularly a wind turbine generator, particularly an external rotor, is provided, comprising: providing a rotor housing; and performing a method for arranging permanent magnet modules at the rotor housing according to any of the foregoing embodiments.

[0038] According to an embodiment of the present invention, a method for manufacturing an electric motor, particularly a wind turbine generator, is provided, comprising: providing a stator having stator windings; providing a rotor housing; rotatably supporting the rotor housing relative to the stator; and performing a method for arranging permanent magnet modules at the rotor housing according to any one of the foregoing embodiments.

[0039] The above and other aspects of the invention will be apparent from examples of embodiments described below, and have been explained with reference to these examples. The invention will now be described in more detail with reference to examples of embodiments, but the invention is not limited thereto. Attached Figure Description

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

[0041] Figure 1 and Figure 2 The illustration schematically depicts a method for arranging permanent magnet modules at a rotor housing according to an embodiment of the present invention;

[0042] Figure 3 and Figure 4 A method for arranging permanent magnet modules at a rotor housing according to another embodiment of the present invention is schematically illustrated; and

[0043] Figure 5 and Figure 6 The illustration schematically depicts a method for arranging permanent magnet modules at a rotor housing according to yet another embodiment of the present invention. Detailed Implementation

[0044] The descriptions in the accompanying drawings are schematic. Note that in different figures, elements that are similar or identical in structure and / or function are provided with the same reference numerals or reference numerals that differ only in the first numeral. Description of an element not described in one embodiment may be obtained from the description of that element with respect to another embodiment.

[0045] Figure 1 and Figure 2The rotor 1 is schematically illustrated in a rolled-up (i.e., straightened) form, with the circumferential direction 2 shown horizontally in the drawing plane and the axial direction 3 in the vertical direction. The rotor housing 6 extends in the axial direction 3 and includes axially extending guide structures 4 to provide a plurality of axial magnet module slots between the guide structures 4, labeled sa, sb, sc, sd, se, sf, sg, sh, si, sj, sk, ... . The module slots sa, sb, ... are spaced apart in the circumferential direction 2. Although the rotor housing 6 is shown in a flat manner, with the guide structures 4 provided therein to form slots 5a, 5b, the rotor housing 6, and therefore the rotor 1, is actually a substantially cylindrical rotor.

[0046] Arrow 5, especially arrows 5a, 5b, ..., 5k, indicates the chronological order of insertion of magnet modules 1a, 1b, 1c, ..., 1j, 1k (collectively labeled with reference numeral 7 in the attached figure), where the longer arrows 5a, 5b, ..., 5k indicate that the corresponding magnet module was inserted earlier than the magnet module associated with the shorter arrows 5a, 5b, ..., 5k. Therefore, the order of the slots is defined by the length of arrows 5a, 5b, ..., according to which magnet modules 1a, 1b, 1c, ... are inserted into slots 5a, 5b, ...

[0047] The insertion can be performed axially layer-wise or slot-wise, as will be explained in more detail below. The order of the slots can be determined beforehand to avoid or reduce undesirable deformation of the rotor housing 6.

[0048] Figure 1 and 2 An embodiment of inserting in an axially layered manner is shown. Thus, considering a first axial range ar1 and at least one additional axial range, here a second axial range ar2 (and also ar3, ar4, ar5, ar6, ar7), and for each of those axial ranges ar1, ar2 (and also ar3, ar4, ar5, ar6, ar7), a predetermined number of one or more magnet modules (collectively labeled 7) are defined to be inserted at each slot sa, sb, ... such that the sum of the predetermined number of magnet modules in all the first and at least one additional axial ranges equals the expected number of magnet modules in each slot.

[0049] Specifically, in the illustrated embodiment, seven axial ranges ar1, ar2, ar3, ar4, ar5, ar6, and ar7 are defined, and for each of the axial ranges ar1, ..., ar7, a predetermined number of one or more magnet modules is exactly one. In other embodiments, for each or at least one of the axial ranges ar1, ..., ar7, the number may be different from one of the predetermined numbers of magnet modules. Figure 1 You can understand it from the middle. Figure 1 The illustration shows the first time interval (or first stage) during the execution of the method. In particular, in order to form the first layer, a (single) magnet module 1a is first inserted into slot sa, and then the corresponding (single) magnet modules are successively inserted into slots sb, sc, sd, se, sf, sg, sh, si, sj, ... until all slots around the circumference have been inserted or filled with exactly one magnet module 7.

[0050] Therefore, the slot order is defined as having the characteristic that the slot immediately adjacent to the last slot previously enriched with one (or more) magnet modules will subsequently be enriched with one or more magnet modules. In this document, if there are no other slots between one slot and another, that slot is considered to be adjacent to said other slot. For example, from... Figure 1 As can be seen, slots sa and sb are adjacent to each other because there are no other slots between them, only guide structure 4.

[0051] After filling the first axial range ar1 with magnet modules, the axial range ar2 is also filled with magnet modules (in the order of 2a, ..., 2k) to complete the second layer or axial range according to the layer-by-layer insertion method. For example, from... Figure 2 As understood in the text, the second layer in the second axial range ar2 begins at groove sa, that is, from the same groove where the first layer also begins. Then, the process continues for the third, fourth, fifth, sixth, and seventh layers in the same manner as the first and second layers.

[0052] Figure 1 The diagram also schematically illustrates a measuring device 10, particularly an optical measuring device 10, configured to measure the distance between a reference point 11 and, for example, regions within a slot (particularly exemplarily indicated as points pj, pi, ph). Other embodiments may be configured to measure additional measuring points at substantially all or a subset of slots, particularly also along the axial direction. The measuring device 10 may, for example, include optical measuring devices, such as ranging devices (e.g., laser rangefinders), which employ lasers to measure the distances dj, di, dh between the reference point 11 and one or more regions or points on the rotor housing 6, particularly the distances at the mounting areas for mounting magnet modules.

[0053] The measuring setup or device 10 can communicate with the processing unit 12, which processes the measurement data from the optical measuring equipment 10 and determines the geometry of the rotor housing 6. The measured geometry of the rotor housing can be compared with the design geometry to identify potential deviations or deformations. Based on those deformations, the insertion method can be adjusted or changed, particularly the order in which the slots into which the magnet modules are inserted can be adjusted or changed. Similar measuring and evaluation equipment can also be used. Figure 2 , 3 In the embodiments shown in 4, 5, and 6.

[0054] For example, the insertion process can be employed in conjunction with rotor housing manufacturing tolerances / eccentricities, which are measured to reverse or reduce their effects on unbalanced magnetic forces, thus limiting any further deformation or greater eccentricity. The proposed techniques or embodiments can be used in conjunction with position sensors, where the insertion can be coordinated based on rotor housing deformation / eccentricity during the insertion process to counteract such impacts, which can lead to the reversal / elimination of these deformations.

[0055] Figure 3 and Figure 4 The illustration shows another embodiment of inserting magnet modules into the rotor housing according to a predetermined slot sequence. First, magnet module 1a is inserted into slot sa, which is considered to be at a 0° circumferential position. Next, slot sj is filled with a module 1j, where slot sj is substantially 180° away from slot sa. Then, slot sc, which is one slot away from the first slot sa, is filled with a magnet module 1c. Afterward, slot se, which is one slot away from the last enriched slot (the last enriched slot is sc), is inserted with a magnet module 1e, and this process continues until a slot with one slot in between is filled with a magnet module, as shown in the illustration. Figure 3 As shown. Thus, the first layer in the first axial range ar1 is completed.

[0056] Next, as Figure 4 As shown, the next layer is formed by first inserting magnet module 2a into the first slot sa, which is considered to be at position 0°. Next, module 2j is inserted into slot sj, which is 180° away from the first slot sa. Then, other modules are inserted into slots sc, se, sg, and si in a similar order to the first layer. Thus, the second layer in the second axial range ar2 is also completed.

[0057] The process then continues in the same manner until all the intended magnet modules have been inserted into slots sa, sc, se, sg, si, sj. In the subsequent steps, the remaining slots sb, sd, sf, sh… are filled sequentially with magnet modules, similar to the previously filled slots.

[0058] Instead of filling slots sc, se, sg, si, slots with specific angular intervals to the first slot sa or sj can be subsequently filled using magnet modules. Similar to... Figure 1 and Figure 2 As mentioned, the same applies to Figure 3 and Figure 4 In the insertion method shown, the number of magnet modules considered to form an axial range or axial layer can be one, two, three, or even more.

[0059] According to one embodiment of the invention, and also as described above (see...) Figure 3 , 4 At a single angle (e.g., 0°), a number of modules can be inserted between the total number of modules per pole and the total number of modules per pole. The same number of modules can be inserted at a position 180° from the previous position. This can be a single pole or several adjacent poles before moving to the diametrically opposite position. Furthermore, the appropriate angle after the initial pole at 0 / 180° can be selected or chosen, for example, 90°, 60°, or another angle.

[0060] Figure 5 and Figure 6 The illustration depicts the insertion of magnet modules in a slotted manner according to an embodiment of the present invention. In a first time span (or stage) of the method, for example, the total expected number of magnet modules for each slot is inserted in slot sa, representing the 0° position. Subsequently, the total expected number of magnet modules for each slot (here, seven) is inserted in slot sj, spaced 180° from the first slot sa. Subsequently, slots sc, se, sg, and si are also (successively) filled with the expected total number of magnet modules, as... Figure 6 As shown (this indicates that slot sc has been filled with all modules, and slot se is in the process of being filled with all modules).

[0061] After that, the remaining slots sb, sd, sf, and sh can also be filled with the total expected number of magnet modules.

[0062] It should be understood that the magnet modules are inserted such that the magnetic orientation of the magnet modules alternates in the circumferential direction and is the same in each slot.

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

Claims

1. A method for arranging permanent magnet modules (7) in a substantially cylindrical, particularly outer rotor housing (6), of an electric motor, particularly a wind turbine generator, the rotor housing (6) extending in an axial direction (3) and a circumferential direction (2), and including axially extending guide structures (4) to provide a plurality of circumferentially spaced axial magnet module slots (sa, sb, sc, ...), the method comprising: The magnet modules (7) are inserted sequentially into the slots (sa, sb, sc, ...) in a predetermined order until each slot is occupied by the expected number of magnet modules for each slot. The magnet insertion module (7) is performed axially in a layered manner or in a slotted manner.

2. The method according to the preceding claim, wherein, The predetermined order of the slots is determined in advance such that the effect of inserting the magnet module (7) on the deformation and / or eccentricity of the rotor housing (6) and / or the generator is at most below a threshold, and shape measurement data is optionally taken into account to change the order of the slots to be filled.

3. The method according to any one of the preceding claims, wherein, The insertion of the magnet module (7) is performed axially in a layered manner, including: A predetermined number of one or more magnet modules (7) to be inserted is defined for each of the first axial range (ar1) and at least one additional axial range (ar2, ..., ar7), such that the sum of the predetermined number of one or more magnet modules for all the first and at least one additional axial range is equal to the expected number of magnet modules for each slot. A) Fill the first axial range (ar1) of each slot (sa, sb, ...) with a first predetermined number of one or more magnet modules (7) in a predetermined order of slots; B) Fill the additional axial range (ar2, ..., ar7) of each slot (sa, sb, sc, ...) in a predetermined order with one or more additional predetermined number of magnet modules; C) Repeat B for any remaining axial ranges (ar3, ..., ar7) that are additional axial ranges.

4. The method according to the preceding claim, wherein, The predetermined sequence includes: a slot (sb) immediately adjacent to the last slot (sa) previously enriched with one or more magnet modules, followed by enrichment of one or more magnet modules.

5. The method according to any one of claims 3 or 4, wherein, The predetermined sequence includes filling another axial range (ar2) starting from the same slot (sa) where the previous axial range (ar1) has already begun.

6. The method according to claim 3, wherein, The predetermined sequence includes performing the filling of the first axial range (ar1) in such a way that it begins with a first groove (sa) that is substantially 0° and continues with a second groove (sj) that is substantially 180°, and / or Then, iteratively, slots (sc) are added one slot away from the first slot (sa), and further, slots (se) are added one slot away from the last enriched slot (sc), and / or Then, the process continues iteratively to the next slot (sb) relative to the first slot, and further to the next slot (sd) relative to the last enriched slot (sb).

7. The method according to claim 3, wherein, The predetermined sequence includes performing the filling of the first axial range (ar1) in such a way that it begins with a first groove (sa) that is substantially 0° and continues with a second groove (sj) that is substantially 180°, and / or then continues with another groove that is substantially 90° and 270° and 60° and 120° and 240° and 45° and 0° and 135°.

8. The method according to any one of claims 3 to 7, wherein, The first and / or additional predetermined number of modules are one, two, three, four or more.

9. The method according to any one of claims 3 to 8, wherein, Each of the first and at least one other predetermined number of modules is one.

10. The method according to claim 2, wherein, The magnet module (7) is inserted in a slotted manner, including: Insert the expected number of magnet modules (1a, 2a, ... 7a) into the first slot (sa); Insert the expected number of magnet modules (1j, 2j, ... 7j) of each slot into the second slot (sj) which is substantially 180° away from the first slot; The desired number of magnet modules for each slot are inserted into a slot (sc) that is one slot away from the first slot in an iterative manner, and this continues in a slot (sc) that is one slot away from the last enriched slot. The desired number of magnet modules for each slot are inserted in an iterative manner into the next slot (sb) relative to the first slot (sa), and this continues in the next slot relative to the last enriched slot.

11. The method according to any one of the preceding claims, wherein, Magnet modules (1a, ..., 7j) are inserted such that the magnetic orientation of the magnet modules alternates in the circumferential direction and is the same in each slot (in the axial direction).

12. The method according to any one of the preceding claims, particularly during or after any magnet module insertion operation, further comprises: Measure the geometric properties of the rotor housing (6); The geometric characteristics are compared with the design shape of the rotor housing in order to determine the amount of deformation indicating the rotor housing. The order of the slots to be filled and / or the number of magnet modules to be inserted in a particular slot are adjusted depending on the amount, in order to counteract any deformation above the threshold.

13. A method for manufacturing a rotor for an electric motor, particularly a wind turbine generator, especially an external rotor (1), comprising: Provide rotor housing (6); Perform the method of arranging a permanent magnet module (7) at the rotor housing (6) according to any one of the preceding claims.

14. A method for manufacturing an electric motor, particularly a wind turbine generator, comprising: Provide a stator with stator windings; Provide rotor housing (6); The rotor housing (6) is rotatably supported relative to the stator; Perform the method of arranging a permanent magnet module (7) at the rotor housing (6) according to any one of the preceding claims 1 to 12.

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