STATOR FOR AN ELECTRICAL MACHINE, ELECTRICAL MACHINE, AND VEHICLE
A stator for an electrical machine includes: a stator core which has a longitudinal axis, an end side, a further end side opposite the end side and a plurality of slots arranged in the circumferential direction and extending from the end side to the further end side, and a stator winding which has a number N of strands, in which N≥3. Each strand occupies a plurality of winding zones in the slots and has at least one continuous current path with a first end and with a second end opposite the first end.
1 . A stator for an electrical machine, comprising a stator core which has a longitudinal axis, an end side, a further end side opposite the end side and a plurality of slots arranged in the circumferential direction and extending from the end side to the further end side, and a stator winding which has a number N of strands, wherein N≥3, wherein
each strand occupies a plurality of winding zones in the slots and has at least one continuous current path with a first end and with a second end opposite the first end, wherein
each winding zone is radially divided into first to L-th layers, which are named according to their order in the radial direction, wherein
the layers form first to (L/2)-th double layers, wherein the i-th of the double layers comprises the (2i−1)-th of the layers and the (2i)-th of the layers for every 1≤i≤(L/2), wherein L≥4 and is straight,
wherein the j-th of the double layers is offset in relation to the (j−1)-th of the double layers for every 2≤j≤(L/2) by a slot along a predetermined circumferential direction, wherein N, L, i and j are natural numbers,
wherein
each of the current paths forms in each case a combined wave and lap winding extending over all of the double layers.
2 . The stator as claimed in claim 1 , wherein
each of the current paths is formed in each case by a plurality of connecting portions of the first type, which are arranged on the end side, a plurality of connecting portions of the second type, which are arranged on the further end side, and a plurality of inner portions, which are arranged within the slots and are connected in series by means of the connecting portions.
3 . The stator as claimed in claim 2 , wherein
each of the connecting portions of the first type connects two inner portions, which are arranged in different double layers, in series.
4 . The stator as claimed in claim 2 , wherein
each of the connecting portions of the second type connects an inner portion, which is arranged in one of the even-numbered layers, in series with an inner portion, which is arranged in one of the odd-numbered layers and follows the inner portion, which is arranged in the even-numbered layer, along the predetermined circumferential direction or along a circumferential direction opposite the predetermined circumferential direction.
5 . The stator as claimed in claim 1 , wherein
the respective ends of the respective current paths are arranged in winding zones which are adjacent with respect to the circumferential direction.
6 . The stator as claimed in claim 1 , wherein
a first and a second current path are provided for each strand.
7 . The stator as claimed in claim 6 , wherein
the first end of the first current path and the first end of the second current path are arranged in the same slot and/or in different layers of the same double layer, and/or
the second end of the first current path and the second end of the second current path are arranged in different, in particular directly adjacent, slots and/or in different, in particular directly adjacent, double layers.
8 . The stator as claimed in claim 6 , further comprising
a star-point connection and, for each strand, a phase connection, wherein
the first ends of the current paths of a respective strand are connected to the phase connection for the respective strand and
the second end of a respective current path of a respective strand is connected to the star-point connection, or
the second end of the first current path of a respective strand is connected to the star-point connection, and the stator has a further star-point connection to which the second end of the second current path of a respective strand is connected;
or
the current paths of a respective strand are connected in series, one of the ends of the first current path of a respective strand is connected to the phase connection for the strand and one of the ends of the second current path of the respective strand is connected to the star-point connection.
9 . The stator as claimed in claim 6 , wherein
the first current path and the second current path extend from the first end to the second end in opposite circumferential directions about the stator core.
10 . The stator as claimed in claim 2 , wherein
each winding zone is divided in the circumferential direction into first to q-th partial winding zones which each comprise all of the layers and are named according to their order in the circumferential direction, in particular their order counter to the predetermined circumferential direction, and the current path has first to q-th partial windings, which are connected in series in the order of their naming, wherein q≥2 and is a natural number, wherein the partial windings are arranged in different partial winding zones, in particular the k-th partial winding in the k-th partial winding zone for every 1≤k≤q, wherein k is a natural number.
11 . The stator as claimed in claim 10 , wherein
each partial winding forms a full revolution about the stator core.
12 . The stator as claimed in claim 10 , wherein
in one of the minimum of one current path, a respective partial winding comprises a set of first to P-th conductor sequences of the first type, which follow one another in the order of their naming with respect to the current path and are arranged in each case in two directly adjacent winding zones, wherein
each conductor sequence of the first type comprises first to (L/2)-th pairs of a first of the inner portions and a second of the inner portions and the pairs are named according to their order along the current path, wherein
the first and second inner portions are arranged in different layers of the double layer corresponding to the naming of the pair, wherein
the first to (P−1)-th conductor sequences of the first type are connected by one of the connecting portions, in particular the connecting portions of the first type, to the conductor sequence of the first type following along the current path and the following conductor sequence of the first type is arranged in two directly adjacent winding zones.
13 . The stator as claimed in claim 10 , wherein
in one of the minimum of one current path, a respective partial winding comprises a set of first to P-th conductor sequences of the second type, which follow one another in the order of their naming with respect to the current path and are arranged in each case in first to fourth directly adjacent winding zones, wherein
each conductor sequence of the second type comprises first to (L/2)-th pairs of a first of the inner portions, and a second of the inner portions, and the pairs are named according to their order along the current path, wherein
the first and second inner portions are arranged in different layers of the same double layer, wherein
the first pair is arranged in the first double layer, wherein
the second pair is arranged in the (L/2)-th double layer, wherein
the third pair is arranged in the second double layer or the third to (L/2)-th pairs are arranged in the second to [(L/2)−1]-th double layer, wherein
the third winding zone, in which the inner portions of the first to (P−1)-th conductor sequences of the second type are arranged, is the first winding zone, in which the conductor sequence following the conductor sequence with respect to the current path is arranged, wherein
the fourth winding zone, in which the inner portions of the first to (P−1)-th conductor sequences of the second type are arranged, is the second winding zone, in which the conductor sequence of the second type following the conductor sequence with respect to the current path is arranged.
14 . An electrical machine, comprising a stator as claimed in claim 1 and a rotor mounted rotatably relative to the stator.
15 . A vehicle, comprising an electrical machine as claimed in claim 14 , wherein the electrical machine is configured for driving the vehicle.
16 . The stator as claimed in claim 1 , wherein
each winding zone is divided in the circumferential direction into first to q-th partial winding zones which each comprise all of the layers and are named according to their order in the circumferential direction, in particular their order counter to the predetermined circumferential direction, and the current path has first to q-th partial windings, which are connected in series in the order of their naming, wherein q≥2 and is a natural number, wherein the partial windings are arranged in different partial winding zones, in particular the k-th partial winding in the k-th partial winding zone for every 1≤k≤q, wherein k is a natural number.
17 . The stator as claimed in claim 3 , wherein
each of the connecting portions of the second type connects an inner portion, which is arranged in one of the even-numbered layers, in series with an inner portion, which is arranged in one of the odd-numbered layers and follows the inner portion, which is arranged in the even-numbered layer, along the predetermined circumferential direction or along a circumferential direction opposite the predetermined circumferential direction.
18 . The stator as claimed in claim 2 , wherein
the respective ends of the respective current paths are arranged in winding zones which are adjacent with respect to the circumferential direction.
19 . The stator as claimed in claim 2 , wherein
a first and a second current path are provided for each strand.
20 . The stator as claimed in claim 19 , wherein
the first end of the first current path and the first end of the second current path are arranged in the same slot and/or in different layers of the same double layer, and/or
the second end of the first current path and the second end of the second current path are arranged in different, in particular directly adjacent, slots and/or in different, in particular directly adjacent, double layers.