Stator for rotating rotating field machine

Abstract

The present invention relates to a stator for a rotating rotating field machine, the stator having a stator base (3), a geometrical machine axis (4) associated with the stator (1), the stator (1) having a stator slot (5) and a stator coil arrangement (6) having a plurality of stator coil strands (7) connectable to a rotating supply voltage at respective phase terminals (8) to generate a rotating field, the stator coil strands (7) being made up of a plurality of conductors (101, 102, ... 103). n ) and each bundle (9) has conductors (101, 102, ... 10 n ) are commonly arranged in the stator slot (5) to form respective star inductances (11), and the conductors (101, 102, ... 10 n ) each has one phase terminal side section (12) and one star point side section (13), and the conductors (101, 102, ... 10) of one bundle (9) n ) are electrically connected to the phase terminals (8) of the respective stator coil strands (7) through the phase terminal side sections (12). n ) are connected to each star point (141, 142, ..., 14) via the star point side section (13). n ) and each star point (141, 142, ..., 14 n ) are electrically isolated from each other.

Description

[Technical Field]

[0001] The invention relates to a stator for a rotating rotating field machine according to the preamble of claim 1, to a rotating rotating field machine according to claim 10 and to a method for manufacturing a stator for a rotating rotating field machine according to the preamble of claim 11.

[0002] The rotating field machines described above are used in many applications. Exemplary applications include electric motors and generators for land, air and water vehicles. Further applications are found in the fields of industrial automation and power generation.

[0003] The stator includes a stator coil arrangement having a plurality of stator coil strands connectable to a rotating supply voltage at respective phase terminals to generate a rotating magnetic field. The stator coil strands are electrically connected to star points in a star circuit.

[0004] In particular, for the relatively high power outputs realized by rotating field machines, the stator coil strands are at least partially formed by respective conductor bundles, so that the required cross-sectional area of ​​the stator coil strands can be provided by multiple conductors. The conductor bundles of the stator coil strands are usually commonly led to a common star point and electrically connected to each other there. In this case, the star inductance is formed by multiple conductors connected in parallel.

[0005] The use of conductor bundles can generally simplify the processing of stator coil strands, particularly the manufacture of windings for star inductances, and can reduce AC losses, but presents a challenge in that the conductor bundle configuration can introduce additional electrical losses.

[0006] The present invention is based on the problem of designing and developing a stator for a rotating electric rotating machine in such a way that the electrical losses in the stator coil arrangement are further reduced.

[0007] The above problem is solved by the features of the characterizing part of claim 1.

[0008] The present invention is based on the premise that each stator coil strand has one bundle having a plurality of conductors, and the conductors of one bundle are commonly arranged in a stator groove to form a star inductance for each stator coil strand. Each conductor has one phase terminal side section and one star point side section, and in this case, the conductors of one bundle are electrically connected to the phase terminals of the respective stator coil strand via the phase terminal side section.

[0009] The present invention is based on the recognition that voltage differences can occur between the individual conductors, particularly due to changes in the position and length of the conductors, and that in this case, a short circuit, conventionally provided in the star-point sections of the conductors of the different stator coil strands at a single common star point, can result in circular currents due to the resulting direct parallel connection of the conductors of the individual bundles, and thus significant electrical losses.

[0010] The key consideration here is the fundamental fact that the conductors of the bundle of stator coil strands are interconnected via multiple, independently located star points, which achieves star-circuit separation for the individual conductors, thereby significantly suppressing circular currents in the bundle conductors.

[0011] In particular, it is proposed that the conductors of the bundles of different stator coil strands are electrically connected to each other based on the respective star points via the star point side sections, and that the star points are electrically isolated from each other.

[0012] The configurations according to claims 2 and 3 provide for the respective star-point triplets to be electrically insulated from one another, which likewise allows for the realization of a star-triangle circuit for the stator coil strands based on the teachings of the present invention. Preferably, the triangular inductances provided between the star points of the star-point triplets are formed by separate bundles of conductors.

[0013] Furthermore, the configuration according to claim 5 is particularly significant, in which the conductors of the bundles in the stator slots are arranged in a geometrically defined order, and thus at least partially ordered. Furthermore, the conductors of the different stator coil strands are electrically connected to each other randomly via star points, so that voltage differences arising due to the arrangement and length of the conductors are at least partially compensated statistically. Accordingly, the occurrence of voltage differences can be significantly minimized.

[0014] The bundled conductors are preferably used in a wound inductance, which is described in claim 6. It is also conceivable to configure them as plug-in inductances using hairpins. A further preferred configuration of the bundle is described in claim 7.

[0015] According to another teaching of claim 9, which has an independent meaning, a rotating rotating field machine is claimed, which comprises a stator according to the proposal and a rotor which magnetically interacts with the stator coil arrangement. Reference is made to all statements relating to the stator according to the proposal.

[0016] According to another teaching of claim 10, which likewise has an independent meaning, a method for manufacturing a stator for a rotating rotating field machine is also claimed. It is important here that the conductors of the bundles of different stator coil strands are electrically connected to each other via star-point sections based on the respective star points, and that the star points are configured to be electrically isolated from each other. Reference is also made to all the descriptions relating to the proposed stator.

[0017] The invention will now be explained in more detail with reference to the drawings, which represent only one embodiment, in which: FIG. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing a proposed stator. [Figure 2] FIG. 2 is a circuit diagram showing a stator coil device in a first configuration. [Figure 3] FIG. 10 is a circuit diagram showing a stator coil device in a second configuration. [Figure 4] FIG. 10 is a circuit diagram showing a stator coil device in a third configuration.

[0019] The stator 1 shown in Figure 1 can be widely used in rotating rotating field machines, in particular electric motors and generators, including, for example, synchronous or asynchronous machines, which may be self-excitable or externally excitable.

[0020] The stator 1 preferably has a hollow stator interior 2 for accommodating a rotor (not shown). Alternatively, the rotor may be arranged outside the stator 1, particularly if the rotating field machine is an outer rotor. In this case, the stator interior 2 can be omitted. In another preferred configuration, the rotating field machine is configured as an axial flux motor. The stator 1 further shows a metallic stator base 3, to which a geometrical mechanical axis 4 is assigned. The stator base 3 has stator slots 5. In the variant with a hollow stator interior 2 shown here, the stator slots 5 are arranged in the stator base 3 and distributed around the mechanical axis 4. FIG. 1 shows a simplified configuration of the stator 1 in a schematic view with the mechanical axis 4 extending perpendicular to the plane of the drawing.

[0021] The stator coil device 6 is used to generate a rotating magnetic field that interacts with the rotor described above. For this purpose, the stator coil device 6 forms electromagnetic poles in a current-carrying state, and the configuration of these electromagnetic poles depends on the structure of the stator coil device 6. The proposed solution can be realized by different structures of the stator coil device 6.

[0022] The stator coil arrangement 6 forms a plurality of, preferably three, stator coil strands 7, each having at least one stator coil. FIG. 1 shows one stator coil per stator coil strand. In principle, a plurality of stator coils may be provided per stator coil strand 7, particularly to form stator coil pairs, and these stator coils are distributed around the machine axis 4. The term "stator coil strand" should therefore be interpreted broadly in this specification. A stator coil strand includes any connection of a plurality of stator coils. The stator coil strands 7 can be connected to rotating supply voltages u, v, and w at respective phase terminals 8 to generate a rotating magnetic field. The rotating supply voltages u, v, and w can be supply voltages with any number of phases, preferably three.

[0023] The stator coil strand 7 is made up of a plurality of conductors 101, 102, ... 10 n In this case, the conductors 101, 102, ... 10 n are commonly arranged in the stator slot 5 to form each star inductance 11. The term "bundle" refers to the individual conductors 101, 102, ... 10 n are electrically connected to one another as will be described in more detail. n However, the bundles 9 are commonly arranged in the stator slots 5, so that the conductors 101, 102, ... 10 of the bundles 9 are n101, 102, ... 103 of the bundle 9 extend at least partially in the same stator slot 5 and at least partially in the same direction. n 1, the conductors 101, 102, ... 10 of the bundle 9 extend at least partially geometrically one after the other. n are, for example, twisted together and can be commonly guided by the stator slot 5. Preferably, each conductor 101, 102, ... 10 n are similar, for example having the same cross-sectional area and / or made from the same material, more preferably copper wire.

[0024] Conductors 101, 102,...10 n Each of the phase terminal sections 12 and the star point section 13 has a phase terminal section 12 and a star point section 13. Preferably, the phase terminal section 12 and the star point section 13 are made of conductors 101, 102, ... 10 n These are end portions located on opposite sides of the

[0025] Conductors 101, 102, ... 10 of bundle 9 n are electrically connected to the phase terminals 8 of the respective stator coil strands 7 via the phase terminal side sections 12. As a result, the stator coil strands 7 having the bundles 9 are made up of a plurality of conductors 101, 102, ... 103 arranged in succession to some extent (starting from the phase terminals 8). n Preferably, all conductors 101, 102, ... 10 of the bundle 9 of the stator coil strands 7 are divided into n The electrical contact points are at the phase terminals 8 or at the supply lines provided at the phase terminals 8 .

[0026] The important thing here is that the conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7 n However, each star point 141, 142, …, 14 n are electrically connected to each other through the star point side section 13 based on the star points 141, 142, ..., 14 n are electrically isolated from each other.

[0027] Conductors 101, 102, ... 10 of bundle 9 n and one common star point 141, 142, …, 14 n Instead of the conventional electrical connection of the conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7, according to the present proposal, n A plurality of star-shaped points 141, 142, ..., 14 n Star points 141, 142, …, 14 n The "electrically isolated from each other" configuration means that the conductors 101, 102, ... 10 n This means that the electrical contact between the star-point sections 13 of the star points 14 is non-existent or sufficiently small beyond the star points 14, so that currents between the star points are suppressed under the conditions that occur during operation of the rotating rotating field machine. n can be connected to each other via a relatively high resistance or indirectly via, for example, a neutral conductor terminal. n remain at floating potential relative to each other. In particular, star points 141, 142, ..., 14 n are electrically connected via the stator coil strands 7, here only indirectly via the phase terminals 8.

[0028] FIG. 2 shows a circuit diagram of a first configuration of the stator 1, in which the conductors 101, 102, . . . 10 of the bundle 9 are n , each of the individual star points 141, 142, ..., 14 n This essentially results in a number of star circuits connected in parallel to the phase terminals 8, each of which preferably includes one or more conductors 101, 102, ... 103 of the bundle 9 of the respective stator coil strands 7. n and each star point 141, 142, …, 14 n It is formed through

[0029] In this case, conductors 101, 102, ... 10n The voltage difference that may occur due to the arrangement and individual characteristics of the conductors 101, 102, ... 10 can be almost negligible. n A much higher electrical resistance is created for the circular currents in the stator coil 10, because the circular current between, for example, two stator coil strands 7 passes through the star inductances 11 of the two stator coil strands 7.

[0030] Conductors 101, 102, ... 10 of different stator coil strands 7 n In order to connect the plurality of star points 141, 142, ..., 14 n In another configuration shown in FIG. 2, the conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7 may be n is connected to the star point triplet 151, 152, ..., 15 via the star point side section 13. n , 151, 152, . . . , 15 n are electrically isolated from each other.

[0031] Each star point triplet 151, 152, …, 15 n are here preferably electrically connected to one another via a delta circuit, so that a star-delta circuit as a whole is obtained between the phase terminals 8 for the stator coil arrangement 6.

[0032] Furthermore, according to FIG. 3, the stator coil device 6 preferably includes a plurality of conductors 101, 102, . . . 10 n 10, and the other bundle 16 has conductors 101, 102, . . . 10 n are commonly arranged in the stator slot 5 to form a triangular inductance 17, and the conductors 10 of the other bundle 16 form a star-point triplet 151, 152, ..., 15 n The star points of are interconnected in each triangular circuit.

[0033] 3 shows a circuit diagram of the stator coil strands 7 of another embodiment of the stator 1. Here, essentially, a plurality of star-triangle circuits are realized connected in parallel to the phase terminals 8, where each parallel star-triangle circuit preferably comprises one or more conductors of a bundle 9 of the respective stator coil strand 7, three or more conductors 101, 102, ... 103 of another bundle 16. n and each star point triplet 151, 152,…,15 n Here, preferably, three separate bundles 16 are provided, and more preferably, the conductors 101, 102, ... 10 of the separate bundles 16 are formed via n The number of conductors 101, 102, ... 10 in the bundle 9 of the stator coil strand 7 is n corresponds to the number of

[0034] Basically, multiple star points 141, 142, …, 14 n , but a plurality of conductors 101, 102, ... 10 n Here, the star points are 141, 142, …, 14 n However, it is particularly preferred to electrically connect each conductor 101, 102, ... 10 of the bundle 9. n There is exactly one star point 141, 142, …, 14 n Or exactly one star point triplet 151, 152, ..., 15 with the star point side section 13 electrically connected n This allows the occurrence of a circular current in the stator coil device 6 to be optimally suppressed.

[0035] In one configuration, the conductors 101, 102, ... 10 of the bundle 9 n are configured to be geometrically arranged in the stator slots 5 in the order according to their respective conductor indices to form respective star-shaped windings.

[0036] The above sequence can be achieved by arranging, in particular winding, the conductors 101, 102 one after the other in the stator slot 5 as shown in FIG.n A certain regularity in the geometrical arrangement of the conductors 101, 102, ... 10 n 1 are present in the stator coil in the order (101-102-101-102-101-102) when viewed radially from the machine axis 4. This can lead to systematic errors in the properties of the conductors 101, 102, which in turn can lead to voltage differences.

[0037] Therefore, the conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7 n are electrically connected to one another by different conductor indices, preferably via the star point section 13. In FIG. 1, for example, the conductor 101 provided for the rotary supply voltage U and the conductor 102 provided for the rotary supply voltages V and W are connected to the star point 142. The conductors 101, 102, ... 10 n Systematic errors in the characteristics of can be at least partially compensated for by "mixing" the conductor indices, which results in a smaller overall voltage difference.

[0038] The teachings of the present proposal are particularly preferably applied to a stator 1 having a wound stator coil arrangement 6, where the star inductance 11 is preferably configured as a star winding. In the above-mentioned configuration with the triangular inductance 17, the triangular inductance 17 is preferably configured as a triangular winding.

[0039] Alternatively or additionally, it is also conceivable that the stator coil arrangement 6 is at least partially of pluggable construction, in which case the conductors 101, 102, . . . 10 n As a result, a star inductance 11 and / or a triangular inductance 17 of a bundle 9 with several hairpins is formed. In this case, the requirements on the geometry of the hairpins are smaller.

[0040] In Fig. 1, the stator 1 is shown diagrammatically in a simple configuration with a centralized inductance and only three star inductances 11 configured as star windings. All embodiments according to the invention correspond accordingly to other possible structural configurations of the stator coil arrangement 6. In a particularly preferred configuration of the stator 1, the stator coil arrangement 6 is configured with distributed inductances, in particular distributed star windings. As already mentioned, a larger number of stator coils, and in particular stator coil pairs, are possible.

[0041] The star inductance 11 is formed by connecting the conductors 101, 102, . . . 10 n 1. The inductance can be formed by a plurality of inductances, in particular by a star-shaped winding, electrically connected in series with the conductors 101, 102, ... 103. Another circuit diagram is shown in FIG. 4, which is complementary to the circuit diagram of FIG. n For each of the conductors 101, 102, ... 103, there is a respective series circuit of inductors, here windings, forming a star inductance 11. n The series-connected inductances are arranged in different stator slots 5. Here, the conductors 101, 102, ... 10 n The conductors are electrically isolated from each other, even between the series-connected inductances, to prevent possible circular currents.

[0042] For each bundle 9, at least two conductors 101, 102, ... 10 n More preferably, the conductors 101, 102, ... 10 n The number of each bundle 9 is a maximum of 20, preferably a maximum of 10.

[0043] In particular, multiple, up to seven conductors 101, 102, ... 10 per bundle 9 n This allows for improved processing of the conductors 10 under the overall cross-sectional area of ​​the bundle 9 which is optimal for many applications.

[0044] Conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7 n For the connection of the rotors 11 and 12, electrical connection elements are provided, which are preferably arranged here via the star-point side sections 13, in particular on the axial front and / or rear side of the stator in relation to the machine axis 4.

[0045] More preferably, the connection elements are provided as connection conductors, connection rails and / or connection terminals, so that the plurality of star points 141, 142, . . . , 14 n As connecting conductors, it is equally possible to use conductors such as wires. In the simplest case, the conductors 101, 102, ... 10 of the bundle 9 are n are the star points 141, 142,…,14 n are interconnected by material bonds to form

[0046] 1 shows the configuration of the connection element with a connection rail arranged on the stator front or rear face and extending, for example, in an annular manner along the stator base body 3. Each conductor 101, 102, ... 10 n are electrically connectable to the connection rails. n and each star point 141, 142, …, 14 n An electrical connection is provided between the

[0047] According to another teaching of independent significance, a rotating field machine (not shown) is proposed, which comprises a stator 1 and a rotor which interacts magnetically with a stator coil arrangement 6 .

[0048] The rotating field machine may be an electric motor or a generator, as mentioned above. In this case, any type of machine may be used. Examples here include synchronous machines, asynchronous machines, or the like, which can be self-excited or externally excited. See the full description of the proposed stator 1.

[0049] According to another teaching, which is also of independent significance, there is provided a method for manufacturing a stator 1 for a rotating rotating field machine, in which a stator base 3 is provided, to which is associated a geometrical machine axis 4 and stator grooves 5 distributed about said machine axis 4 in the stator base 3, and which is connectable to a rotating supply voltage at respective phase terminals 8 to generate a rotating field, and which is connected to a plurality of conductors 101, 102, ... 10 n A stator coil device 6 is provided which includes a plurality of stator coil strands 7 each having one bundle 9, and the conductors 101, 102, ... 10 of one bundle 9 are n are commonly arranged in the stator slot 5 to form respective star inductances, and the conductors 101, 102, . . . 10 n Each of the conductors 101, 102, ... 10 has one phase terminal side section 12 and one star point side section 13. n are electrically connected to the phase terminals 8 of the respective stator coil strands 7 via the phase terminal side sections 12.

[0050] In the proposed method, the conductors 101, 102, ... 10 of the bundle 9 of each different stator coil strand 7 are n are connected to the star points 141, 142, ..., 14 via the star point side section 13. n It is important that the star points are electrically connected to one another based on the stator 1 and the star points are electrically isolated from one another. See all the descriptions relating to the proposed stator 1 and the proposed rotating field machine.

[0051] Furthermore, it is preferred here that the star inductance 11 is manufactured using a flyer winding, and it is preferred that the stator coil arrangement 6 is made up of a plurality of conductors 101, 102, . . . 10 n 10, and the bundle 16 has conductors 101, 102, . . . 10 n are commonly arranged in the stator slots 5 to form a triangular winding, and the conductors 101, 102, . . . 10 of the other bundle 16 are n is the star point triplet 151,152,…,15 nStar points 141, 142, …, 14 n are connected to each other in each delta circuit 17, and the delta inductance 17 is constructed as a delta winding using a flyer winding.

[0052] In this case, the proposed method allows for a simple processing of the stator coil strands 7, as already described for the proposed stator 1, and in this case, in particular the conductors 101, 102, ... 10 of the bundle 9. n Due to the relatively small cross section of the coil, flyer windings can be used to produce wound inductances.

[0053] Alternatively or additionally, plug-in inductances can also be used, in particular based on hairpin technology.

Claims

1. A stator for a rotating rotating field machine, comprising a stator base (3), A geometric mechanical axis (4) is associated with the stator (1), the stator (1) having a stator slot (5) and a stator coil arrangement (6) having a plurality of stator coil strands (7) connectable to a rotating supply voltage at respective phase terminals (8) to generate a rotating magnetic field; The stator coil strand (7) is made up of a plurality of conductors (10 １ , 10 ２ , …10 ｎ ) and the conductors (10) of each bundle (9) １ , 10 ２ , …10 ｎ ) are commonly arranged in the stator groove (5) to form star inductances (11) of the respective stator coil strands (7), The conductor (10 １ , 10 ２ , …10 ｎ ) each having one phase terminal side section (12) and one star point side section (13), A bundle (9) of conductors (10 １ , 10 ２ , …10 ｎ ) are electrically connected to the phase terminals (8) of the respective stator coil strands (7) via the phase terminal side sections (12). In the stator, The conductors (10) of the bundles (9) of the different stator coil strands (7) １ , 10 ２ , …10 ｎ ) are connected to each star point (14) via the star point side section (13). １ , 14 ２ , …, 14 ｎ ) and are electrically connected to each other based on Each star point (14 １ , 14 ２ , …, 14 ｎ ) are electrically isolated from each other. A stator characterized by:

2. The conductors (10) of the bundles (9) of the different stator coil strands (7) １ , 10 ２ , …10 ｎ ) is connected to the star point triplet (15) via the star point side section (13). １ , 15 ２ , …, 15 ｎ ) and are interconnected based on Preferably, each star point triplet (15 １ , 15 ２ , …, 15 ｎ ) are electrically isolated from each other. The stator of claim 1 .

3. The stator coil device (6) includes a plurality of conductors (10 １ , 10 ２ , …10 ｎ ) and another bundle (16) with The conductors (10) of the other bundle (16) １ , 10 ２ , …10 ｎ ) are commonly arranged in the stator slot (5) to form a triangular inductance (17), The conductors (10) of the other bundle (16) １ , 10 ２ , …10 ｎ ) is a star-point triplet (15 １ , 15 ２ , …, 15 ｎ ) star points are interconnected as respective triangular circuits, The stator according to claim 2.

4. Each conductor (10) of one bundle (9) １ , 10 ２ , …10 ｎ ) to which the star point side section (13) is electrically connected, exactly one star point (14) １ , 14 ２ , …, 14 ｎ ) or exactly one star point triplet (15 １ , 15 ２ , …, 15 ｎ 4. The stator according to claim 1, wherein the first and second rotors are connected to the first and second rotors.

5. A bundle (9) of conductors (10 １ , 10 ２ , …10 ｎ ) are geometrically arranged in the stator slots (5) in order according to their respective conductor indices to form respective star-shaped windings, The conductors (10) of the bundles (9) of the different stator coil strands (7) １ , 10 ２ , …10 ｎ ) are electrically connected to each other via star-point side sections (13) with different conductor indexes, 5. A stator according to any one of claims 1 to 4.

6. 6. The stator according to claim 1, wherein the star inductance (11) is configured as a star winding, and preferably the triangular inductance (17) is configured as a triangular winding.

7. The star inductances (11) each have one conductor (10 １ , 10 ２ , …10 ｎ 7. The stator according to claim 1, wherein the stator is constituted by a plurality of inductances, in particular star-shaped windings, electrically connected in series with the rotor.

8. The conductor (10 １ , 10 ２ , …10 ｎ 8. A stator according to claim 1, wherein the number of coils per bundle (9) is at most 20, preferably at most 10, more preferably at most 7.

9. The conductors (10) of the bundles (9) of the different stator coil strands (7) １ , 10 ２ , …10 ｎ ) are provided over the star-point section (13), in particular arranged on the stator front and / or rear faces in the axial direction relative to the machine axis (4), Preferably, the connection elements are provided as connecting conductors, connecting rails and / or connecting terminals. A stator according to any one of claims 1 to 8.

10. A rotating rotating field machine comprising a stator (1) according to any one of claims 1 to 9 and a rotor magnetically interacting with the stator coil arrangement (6).

11. A method for manufacturing a stator (1) for a rotating rotating field machine, comprising the steps of: A stator base (3) is provided, A geometric mechanical axis (4) is associated with the stator (1), A plurality of conductors (10) connectable to a rotating supply voltage at respective phase terminals (8) to form a rotating magnetic field. １ , 10 ２ , …10 ｎ a stator coil device (6) comprising a plurality of stator coil strands (7), each having one bundle (9) comprising a plurality of stator coil strands (7); A bundle (9) of conductors (10 １ , 10 ２ , …10 ｎ ) are commonly arranged in the stator grooves (5) of the stator base (3) to form respective star inductances (11); The conductor (10 １ , 10 ２ , …10 ｎ ) each having one phase terminal side section (12) and one star point side section (13), A bundle (9) of conductors (10 １ , 10 ２ , …10 ｎ ) are electrically connected to the phase terminals (8) of the respective stator coil strands (7) via the phase terminal side sections (12). In the method, The conductors (10) of the bundles (9) of the different stator coil strands (7) １ , 10 ２ , …10 ｎ ) are connected to each star point (14) via the star point side section (13). １ , 14 ２ , …, 14 ｎ ) are electrically connected to each other based on Each star point (14 １ , 14 ２ , …, 14 ｎ ) are electrically isolated from each other. A method characterized by:

12. The star inductance (11) is manufactured as a star winding using a flyer winding, Preferably, the stator coil device (6) comprises a plurality of conductors (10 １ , 10 ２ , …10 ｎ ) and another bundle (16) with The conductors (10) of the other bundle (16) １ , 10 ２ , …10 ｎ ) are commonly arranged in the stator slots (5) to form a triangular winding, The conductors (10) of the other bundle (16) １ , 10 ２ , …10 ｎ ) by star triplet (15 １ , 15 ２ , …, 15 ｎ ) are connected to each other in respective triangular circuits, The triangular inductance (17) is manufactured as a triangular winding using flyer windings. The method of claim 11.

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