Flat wire winding structure and stator and motor including the same

Abstract

The present invention discloses a flat wire winding structure and a stator and a motor including the same. The flat wire winding structure is arranged in a stator core, and a plurality of wire slots are provided in the teeth of the stator core. Each wire slot is provided with a plurality of radially arranged and even-numbered mounting positions for accommodating the pins of a plurality of flat wire coil conductors. The flat wire winding structure includes a first phase winding, a second phase winding and a third phase winding, and each phase winding includes four parallel branches. The first phase winding, the second phase winding and the third phase winding are all double-layer winding structures. In one circle of winding around the stator core, each parallel branch is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot, and two different parallel branches of the same phase winding overlap in the wire slot to form the double-layer winding structure. The motor involved in the present invention has good torque output performance and high power factor.

Description

Technical Field

[0001] The present invention relates to the field of motors in electric vehicles, and in particular to a flat wire winding structure and a stator and a motor comprising the same. Background Art

[0002] With the development of electric vehicle technology, the requirements for the operating performance of the drive motor are getting higher and higher. As a key component of electric vehicles, the output performance of the drive motor directly affects the efficient operation of the whole machine.

[0003] Compared with traditional round wire motors, the current flat wire motors have the advantages of higher slot fill rate, better temperature performance and wider high-efficiency zone. Their windings are generally made of several square conductors connected by welding, and the number of square conductors in the motor stator core slots is generally 2, 4 or 8, and the number of parallel branches is generally 1 or 2.

[0004] A four-way parallel flat wire motor winding structure in the prior art reduces the high-speed skin effect of the conductor by increasing the number of conductors per slot in the stator core under a certain DC bus voltage platform, improves the temperature rise performance of the flat wire motor under high-speed working conditions, broadens the selection space of the number of winding turns and the number of parallel branches in the motor scheme design stage, and is conducive to optimizing the motor design scheme to better meet the motor performance and temperature rise requirements. However, this type of winding structure is a single-layer arrangement, the height of the motor winding end is relatively high, and the copper loss is relatively high, which does not meet the current high performance requirements of electric vehicles for drive motors.

[0005] Therefore, there is an urgent need for a double-layer flat wire winding structure so that the motor has better torque output performance and higher power factor. Summary of the invention

[0006] The invention provides a flat wire winding structure and a stator and a motor comprising the same, which are used to improve the torque output performance and the problem of low power factor of the existing flat wire winding motor.

[0007] In order to solve the above technical problems, the first aspect of the present invention provides a flat wire winding structure, which is arranged in a stator core, and a plurality of wire slots are opened in the teeth of the stator core, and each of the wire slots is provided with a plurality of radially arranged and even-numbered mounting positions for accommodating the pins of a plurality of the flat wire coil conductors, characterized in that: the flat wire winding structure includes a first phase winding, a second phase winding and a third phase winding, and each phase winding includes four parallel branches, and the first phase winding, the second phase winding and the third phase winding are all double-layer winding structures; in one circle of winding around the stator core, each of the parallel branches is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot, and two different parallel branches of the same phase winding overlap in the wire slot to form the double-layer winding structure.

[0008] Preferably, each parallel branch of the first phase winding, the second phase winding and the third phase winding is formed by alternately connecting flat wire coil conductors with a span of 6 slots or a span of 7 slots to avoid circulating current between different parallel branches.

[0009] Preferably, the number of turns of each parallel branch around the stator core is n, wherein: when n is an even number, the number of turns of each parallel branch from the first to the second is n. and The nth turn is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot across 6 wire slots; the first to The loop is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot across 7 wire slots; when n is an odd number, the 1st to 2nd of each parallel branch and The nth turn is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot across 6 wire slots; the first to or to The loop is introduced from the upper layer of one wire trough and led out from the lower layer of another wire trough across 7 wire troughs.

[0010] Preferably, each of the wire slots is provided with 12 installation positions for accommodating the flat wire coil conductors, and the flat wire coil conductors passing through the 12 installation positions of each wire slot belong to at least two parallel branches respectively.

[0011] The second aspect of the present invention provides a stator, comprising a stator core and the flat wire winding structure as described above; one axial end of the stator core is a winding hairpin end, and the other axial end is a winding welding end; the flat wire winding structure is arranged in the stator core having a plurality of wire slots, and the flat wire coil conductor is inserted into the wire slots to complete the arrangement of the flat wire winding structure.

[0012] Preferably, the first phase winding, the second phase winding and the third phase winding each include a first parallel branch, a second parallel branch, a third parallel branch and a fourth parallel branch, and the relative positions of the three-phase winding lead wires and the star point line are as follows: the input lead ends of the parallel branches of the first phase winding, the second phase winding, and the third phase winding are arranged at the winding hairpin end in the order of the first parallel branch of the first phase winding, the second parallel branch of the first phase winding, the first parallel branch of the second phase winding, the second parallel branch of the second phase winding, the first parallel branch of the third phase winding, the second parallel branch of the third phase winding, the third parallel branch of the first phase winding, the fourth parallel branch of the first phase winding, the third parallel branch of the second phase winding, the fourth parallel branch of the second phase winding, the third parallel branch of the third phase winding and the fourth parallel branch of the third phase winding.

[0013] Preferably, the outgoing terminals of the first phase winding, the second phase winding and the third phase winding are connected via a busbar.

[0014] Preferably, each of the wire slots accommodates an even number of 10 or more flat wire coil conductors.

[0015] Preferably, the stator core has 48 slots.

[0016] A third aspect of the present invention provides a flat wire motor, comprising the stator as described above and a rotor, wherein the rotor is coaxially disposed in the stator.

[0017] The above-mentioned flat wire winding structure has a three-phase winding with a double-layer winding structure. Compared with the single-layer winding structure of the existing motor, its slot fill rate is higher, so that the motor has a smaller copper loss, and the motor can have better torque output performance and higher power factor at low speed; and the flat wire winding adopts a double-layer winding structure to make the motor end lower and reduce copper loss, thereby improving the overall efficiency range of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a 3D assembly forward schematic diagram of a flat wire winding structure in an embodiment of the present invention;

[0019] Figure 2 is a 3D assembly axial schematic diagram of a flat wire winding structure in an embodiment of the present invention;

[0020] Figure 3 is a wiring diagram of one of the parallel branches in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the single-phase winding arrangement and routing structure in an embodiment of the present invention;

[0022] Figure 5Schematic diagram of part of the winding in an embodiment of the present invention.

[0023] In the figure,

[0024] 1. Stator core, 2. Flat wire coil conductor. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information. It should be noted that the drawings of this scheme are only principled system diagrams, and do not fully show all the components of the present invention. When adding components to this system, the core principle remains the same as that of this scheme.

[0028] Combination Figure 1 and Figure 2 An embodiment of the present invention provides a flat wire winding structure, which is arranged in a stator core 1, and a plurality of wire slots are opened in the teeth of the stator core 1, each wire slot is provided with a plurality of radially arranged mounting positions for accommodating the pins of a plurality of flat wire coil conductors 2; wherein the flat wire winding structure includes a first phase winding, a second phase winding and a third phase winding, and each phase winding includes four parallel branches, and the first phase winding, the second phase winding and the third phase winding are all double-layer winding structures; in one circle of winding around the stator core, each parallel branch is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot, and two different parallel branches of the same phase winding overlap in the wire slot to form the double-layer winding structure.

[0029] For the convenience of description, the installation positions in the slots are arranged in ascending order according to the direction close to the center of the stator core, and are recorded as the 1st layer, the 2nd layer, the 3rd layer, the 4th layer, etc.; the slots are marked in circumferential order as the 1st slot, the 2nd slot, the 3rd slot, the 4th slot, etc. Among them, the double-layer winding structure refers to the overlap of two different parallel branches of the same phase winding in the slot to form a double-layer winding structure.

[0030] For example, the two parallel branches of the first layer and the second layer passing through the first slot are stacked on each other in the winding structure, specifically, the flat wire coil conductor passing through the first layer in the first slot is connected to the flat wire coil conductor of the second layer in the Mth slot (M is not equal to 1), and the flat wire coil conductor passing through the second layer in the first slot is connected to the flat wire coil conductor of the first layer in the Mth slot; then the flat wire coil conductor passing through the second layer in the Mth slot is connected to the flat wire coil conductor of the first layer in the Lth slot (L is not equal to M), and the flat wire coil conductor passing through the first layer in the Mth slot is connected to the flat wire coil conductor of the second layer in the Lth slot... and so on, the connections are made in the above order and according to the rules until the first and second layers of all slots on the stator core are completed. The connection method of the flat wire coil conductor of the 3rd layer and the flat wire coil conductor of the 4th layer in the same wire slot is the same as the connection method of the flat wire coil conductor of the 1st layer and the flat wire coil conductor of the 2nd layer. The connection method of the flat wire coil conductor of the 5th layer and the flat wire coil conductor of the 6th layer in the same wire slot is the same as the connection method of the flat wire coil conductor of the 1st layer and the flat wire coil conductor of the 2nd layer, and so on.

[0031] It is worth noting that when the flat wire coil conductor of the second layer has completed nearly one circle in the circumferential order, the flat wire coil conductor of the second layer will be connected to the flat wire coil conductor of the third layer in the next wire slot to be connected; when the flat wire coil conductor of the fourth layer has completed nearly one circle in the circumferential order, the flat wire coil conductor of the fourth layer will be connected to the flat wire coil conductor of the fifth layer in the next wire slot to be connected; when the flat wire coil conductor of the sixth layer has completed nearly one circle in the circumferential order, the flat wire coil conductor of the sixth layer will be connected to the flat wire coil conductor of the seventh layer in the next wire slot to be connected; and so on, to ensure that a complete circuit loop is formed.

[0032] In addition, the flat wire coil conductors described above are all hairpin coils, which have a bending portion and two pins. During the connection process, all flat wire coil conductors are inserted from one end of the stator core, wherein the two pins of each flat wire coil conductor are inserted into the installation positions in the two wire slots to be inserted. The two flat wire coil conductors that need to be connected to each other are connected to each other by bending the pins. For example, the connection method of the first flat wire coil conductor with the second pin inserted into the second layer of the 7th wire slot and the second flat wire coil conductor with the first pin inserted into the first layer of the 13th wire slot is: the second pin of the first flat wire coil conductor is bent respectively to abut against each other and connected by welding to ensure the formation of a complete circuit loop.

[0033] A flat wire winding structure provided in the first aspect of an embodiment of the present invention has a three-phase winding with a double-layer winding structure. Compared with the single-layer winding structure of the existing motor, its slot fill rate is higher, so that the motor has a smaller copper loss, and the motor can have better torque output performance and higher power factor at low speed; and the flat wire winding adopts a double-layer flat wire winding structure to make the motor end lower and reduce copper loss, thereby improving the overall efficiency range of the motor.

[0034] Furthermore, each parallel branch of the first phase winding, the second phase winding and the third phase winding is formed by alternatingly connecting flat wire coil conductors with a span of 6 slots or a span of 7 slots to avoid circulating current between different parallel branches, that is, the 1st slot and the Mth slot differ by 6 slots or 7 slots, and the Mth slot and the Lth slot differ by 6 slots or 7 slots. The specific number of slots can be determined according to the actual slot positions and connection conditions.

[0035] Specifically, the installation positions in the wire slots are arranged in ascending order according to the direction close to the center of the stator core, and the flat wire coil conductors passing through the middle sequence number are crossed in a manner of 7 wire slots, and the flat wire coil conductors passing through the remaining sequence numbers are crossed in a manner of 6 wire slots;

[0036] Specifically, if it is assumed that the number of turns of each parallel branch around the stator core is n, then:

[0037] When n is an even number, the 1st to 2nd branches of the parallel circuit are connected. and The nth turn is introduced from the upper layer of a wire slot and leads out from the lower layer of another wire slot across 6 wire slots; the first to The loop is introduced from the upper layer of one wire trough and led out from the lower layer of another wire trough across 7 wire troughs;

[0038] When n is an odd number, the first to the second parallel branches and The nth turn is introduced from the upper layer of a wire slot and leads out from the lower layer of another wire slot across 6 wire slots; the first to or to The loop is introduced from the upper layer of one wire trough and led out from the lower layer of another wire trough across 7 wire troughs.

[0039] That is, if each wire slot is provided with 12 installation positions, the flat wire coil conductor passing through the 6th layer of a certain wire slot and the 7th layer of the next wire slot to be connected (the flat wire coil conductor connecting from the wire slot with a higher wire slot number to the wire slot with a lower wire slot number) needs to be connected across 7 wire slots, and the rest of the cases are connected by crossing 6 wire slots. Similarly, if each wire slot is provided with 10 installation positions, the flat wire coil conductor passing through the 5th layer of a certain wire slot and the 6th layer of the next wire slot to be connected (the flat wire coil conductor connecting from the wire slot with a higher wire slot number to the wire slot with a lower wire slot number) needs to be connected across 7 wire slots, and the rest of the cases are connected by crossing 6 wire slots. Preferably, when the stator core is provided with 48 wire slots, since the flat wire winding structure has a total of three-phase windings, each winding has a total of 4 parallel branches, and therefore the span of 7 wire slots appears 4 times in each phase winding, and a total of 12 times in the three-phase winding.

[0040] It should be noted that each wire slot is provided with 12 installation positions for accommodating flat wire coil conductors, and the flat wire coil conductors passing through the 12 installation positions belong to at least two parallel branches respectively.

[0041] A second aspect of an embodiment of the present invention provides a stator, which includes a stator core 1 and the flat wire winding structure as described above; one axial end of the stator core 1 is a winding hairpin end, and the other axial end is a winding welding end; the flat wire winding structure is arranged in the stator core 1 with a plurality of wire slots, and the flat wire coil conductor is inserted into the wire slot to complete the arrangement of the flat wire winding structure.

[0042] Furthermore, combined with Figure 5 The first phase winding, the second phase winding and the third phase winding are all distributed to include a first parallel branch, a second parallel branch, a third parallel branch and a fourth parallel branch, and the relative positions of the three-phase winding lead wires and the star point line are as follows: the input lead wire ends of the parallel branches of the first phase winding, the second phase winding, and the third phase winding are arranged at the winding card end in the order of the first parallel branch of the first phase winding, the second parallel branch of the first phase winding, the first parallel branch of the second phase winding, the second parallel branch of the second phase winding, the first parallel branch of the third phase winding, the second parallel branch of the third phase winding, the third parallel branch of the first phase winding, the fourth parallel branch of the first phase winding, the third parallel branch of the second phase winding, the fourth parallel branch of the second phase winding, the third parallel branch of the third phase winding and the fourth parallel branch of the third phase winding.

[0043] It is worth noting that the above winding structure distribution is one of the preferred embodiments of the present invention. Other similar winding structures improved according to the preferred embodiment are, for example, sequentially modified into a first parallel branch of the first phase winding, a second parallel branch of the first winding, a third parallel branch of the third phase winding, a fourth parallel branch of the third phase winding, a first parallel branch of the second phase winding, a second parallel branch of the second phase winding, a third parallel branch of the first phase winding, a fourth parallel branch of the first phase winding, a first parallel branch of the third phase winding, a second parallel branch of the third phase winding, a third parallel branch of the second phase winding, and a fourth parallel branch of the second phase winding;

[0044] Alternatively, the sequence is modified in turn to the first parallel branch, the second parallel branch, the third parallel branch and the fourth parallel branch of the first phase winding; the first parallel branch, the second parallel branch, the third parallel branch and the fourth parallel branch of the third phase winding; and the connection method of the first parallel branch, the second parallel branch, the third parallel branch and the fourth parallel branch of the second phase winding is similar to the idea of ​​the embodiments of the present invention and also falls within the protection scope of the present invention.

[0045] Furthermore, the output terminal of the three-phase winding is output through a welded busbar or a busbar injection molded part, which has better assembly feasibility.

[0046] Furthermore, each wire slot can accommodate 10 or more even-numbered flat wire coil conductors, preferably 12 in this embodiment.

[0047] Furthermore, the number of slots of the stator core is 48.

[0048] The following describes the structure of a specific embodiment of the present invention, taking a stator with 48 slots, 12 mounting positions in each slot, and 4 parallel branches per phase as an example. Also for the convenience of description, the mounting positions in the slots are sorted in ascending order in the direction close to the center of the stator core, and are recorded as the 1st layer, the 2nd layer... the 11th layer, the 12th layer; the slots are marked as the 1st slot, the 2nd slot... the 47th slot, the 48th slot in the circumferential order; also in order to distinguish different flat wire coil conductors, each flat wire coil conductor is marked as #1, #2, #3, #4...

[0049] Combination Figure 3 and Figure 4, specifically describing the connection of one of the parallel branches: the parallel branch starts from the first layer of the first wire slot, the first pin of the #1 flat wire coil conductor is inserted into the first layer of the first wire slot, and the second pin is inserted into the second layer of the seventh wire slot; then, the first pin of the #2 flat wire coil conductor is inserted into the first layer of the 13th wire slot, the second pin is inserted into the second layer of the 19th wire slot, and the second pin of the #1 flat wire coil conductor and the first pin of the #2 flat wire coil conductor are welded to each other by bending the pins at the other end surface of the stator core; then, the first pin of the #3 flat wire coil conductor is inserted into the first layer of the 25th wire slot, the second pin is inserted into the second layer of the 31st wire slot, and the second pin of the #2 flat wire coil conductor and the first pin of the #3 flat wire coil conductor are welded to each other by bending the pins at the other end surface of the stator core; Next, the first pin of the #4 flat wire coil conductor is inserted into the first layer of the 37th wire slot, the second pin is inserted into the second layer of the 43rd wire slot, the second pin of the #3 flat wire coil conductor and the first pin of the #4 flat wire coil conductor are bent and welded to each other at the other end face of the stator core... After the #4 flat wire coil conductor passes through the second layer of the 43rd wire slot, since the remaining number of slots can no longer provide slots for connection according to the above connection method, the first pin of the #5 flat wire coil conductor is inserted into the third layer of the 1st wire slot, the second pin is inserted into the fourth layer of the 7th wire slot, the second pin of the #4 flat wire coil conductor and the first pin of the #5 flat wire coil conductor are bent and welded to each other at the other end face of the stator core... The next connection method is connected by analogy using this double-layer winding method.

[0050] In particular, after the first pin of the #N flat wire coil conductor is inserted into the 5th layer of the 37th wire slot and the second pin is inserted into the 6th layer of the 43rd wire slot, the first pin of the #N+1 flat wire coil conductor needs to be inserted into the 7th layer of the 2nd wire slot and the second pin is inserted into the 8th layer of the 8th wire slot. The second pin of the #N flat wire coil conductor and the first pin of the #N+1 flat wire coil conductor are welded to each other by bending the pins at the other end surface of the stator core; that is, the wire slot where the second pin of the #N flat wire coil conductor is located differs from the wire slot where the first pin of the #N+1 flat wire coil conductor is located by 7 wire slot positions, instead of 6 wire slot positions. This setting is conducive to avoiding circulating currents between different parallel branches.

[0051] Then, the subsequent connection method is similar to the connection rule described above, using a span of 6 wire slots until it is connected to the 12th layer of the 44th wire slot. From the above description, it is not difficult to see that the wiring of the parallel branch is led out at the 1st layer of the 1st wire slot and the 12th layer of the 44th wire slot.

[0052] The above is a connection method for one of the parallel branches of a phase winding. The connection method for other parallel branches of the phase winding or parallel branches of other phase windings is similar to the above connection method, except that the installation position of the connection and the installation position where the wiring lead is located are different.

[0053] A motor provided in the third aspect of an embodiment of the present invention comprises a stator as described above and a rotor, wherein the rotor is coaxially arranged in the stator. Since the motor adopts the flat wire winding structure provided in the first aspect of the embodiment of the present invention, when the second pins and the first pins of different flat wire coil conductors are bent and welded to each other, the end of the motor can be lower than the end of the single-layer flat wire winding structure in the prior art. Specifically, when the pins of different flat wire coil conductors are bent and welded to each other, the single-layer flat wire winding structure in the prior art needs to span at least 7 wire slots due to process requirements; the flat wire winding structure involved in this embodiment adopts a span of 6 wire slots or 7 wire slots, which is at least 10% lower than the end height of the prior art. Therefore, the motor involved in this embodiment has good torque output performance and high power factor at low speed, so that the motor has good efficiency performance while outputting.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A flat wire winding structure, arranged in a stator core, wherein the teeth of the stator core are provided with a plurality of wire slots, each of the wire slots is provided with a plurality of radially arranged and even-numbered mounting positions for accommodating pins of a plurality of flat wire coil conductors, characterized in that: The flat wire winding structure includes a first phase winding, a second phase winding and a third phase winding, and each phase winding includes four parallel branches, and the first phase winding, the second phase winding and the third phase winding are all double-layer winding structures; in one circle of winding around the stator core, each parallel branch is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot, and two different parallel branches of the same phase winding overlap in the wire slot to form the double-layer winding structure; Each parallel branch of the first phase winding, the second phase winding and the third phase winding is formed by alternately connecting flat wire coil conductors with a span of 6 slots or a span of 7 slots, so as to avoid circulating current between different parallel branches; The number of turns of each parallel branch around the stator core is n, wherein: when n is an even number, the turns of each parallel branch from 1 to and The nth turn is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot across 6 wire slots; the first to The loop is introduced from the upper layer of one wire trough and led out from the lower layer of another wire trough across 7 wire troughs; When n is an odd number, the first to the second parallel branches of each of the parallel branches are and The nth turn is introduced from the upper layer of a wire slot and led out from the lower layer of another wire slot across 6 wire slots; the first to or to The loop is introduced from the upper layer of a wire trough and leads out from the lower layer of another wire trough across 7 wire troughs; The flat wire coil conductors are all hairpin coils, which have a bending portion and two pins. During the connection process, all flat wire coil conductors are inserted from one end of the stator core, wherein the two pins of each flat wire coil conductor are inserted into the installation positions in the two wire slots to be inserted, and the two flat wire coil conductors that need to be connected to each other are connected to each other by bending the pins.

2. The flat wire winding structure according to claim 1, characterized in that: Each of the wire slots is provided with 12 installation positions for accommodating the flat wire coil conductors, and the flat wire coil conductors passing through the 12 installation positions of each of the wire slots belong to at least two parallel branches respectively.

3. A stator, characterized in that: It comprises a stator core and the flat wire winding structure as claimed in any one of claims 1 to 2; one axial end of the stator core is a winding hairpin end, and the other axial end is a winding welding end; the flat wire winding structure is arranged in the stator core with a plurality of wire slots, and the flat wire coil conductor is inserted into the wire slots to complete the arrangement of the flat wire winding structure.

4. The stator according to claim 3, characterized in that: The first phase winding, the second phase winding and the third phase winding each include a first parallel branch, a second parallel branch, a third parallel branch and a fourth parallel branch, and the relative positions of the three-phase winding lead wires and the star point line are as follows: the input lead ends of the parallel branches of the first phase winding, the second phase winding, and the third phase winding are arranged at the winding card end in the order of the first parallel branch of the first phase winding, the second parallel branch of the first phase winding, the first parallel branch of the second phase winding, the second parallel branch of the second phase winding, the first parallel branch of the third phase winding, the second parallel branch of the third phase winding, the third parallel branch of the first phase winding, the fourth parallel branch of the first phase winding, the third parallel branch of the second phase winding, the fourth parallel branch of the second phase winding, the third parallel branch of the third phase winding and the fourth parallel branch of the third phase winding.

5. The stator according to claim 4, characterized in that: The outgoing wire ends of the first phase winding, the second phase winding and the third phase winding are connected via a busbar.

6. The stator according to claim 3, characterized in that: Each of the wire slots accommodates an even number of 10 or more flat wire coil conductors.

7. The stator according to claim 3, characterized in that: The number of slots of the stator core is 48.

8. A motor, characterized in that: Comprising a stator as claimed in any one of claims 3 to 7.

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