Stator winding of fractional slot permanent magnet motor distributed in whole circle

Abstract

The invention discloses a stator winding of a fractional-slot permanent magnet motor distributed in a whole circle, which comprises a three-phase winding formed by a plurality of coils arranged in stator slots of a stator core, and the three-phase winding is a fractional-slot double-layer short-distance distribution winding. The method is characterized in that the time distribution and the space distribution of each coil in the branch circuit to which the coil belongs are arranged according to the principle of symmetry in a whole circle range; the motor has the advantages that the arrangement scheme of the three-phase windings enables a single branch of each phase winding to adopt a principle of symmetry in a whole circle range in time and space distribution, so that the problem of magnetic circuit imbalance between branches of a stator caused by a rotor magnetic circuit imbalance design is avoided; the whole rotor magnetic circuit is relatively symmetrical, the motor rotates stably, and noise generated during operation is relatively low.

Description

Technical Field

[0001] The invention relates to a stator winding structure of a motor, in particular to a stator winding of a permanent magnet motor with fractional slots distributed in a whole circle. Background Art

[0002] In order to improve the flexibility of the stator winding design of the fractional-slot permanent magnet motor, especially when the rated voltage is low or the rated speed is high, the design of the stator winding of the fractional-slot permanent magnet motor is more sensitive and limited. Therefore, the design of multi-branch fractional-slot stator winding is particularly important.

[0003] When designing a fractional slot permanent magnet motor, in order to reduce the influence of the cogging effect, it is a common method to adopt an asymmetric magnetic circuit structure for the rotor. The conventional multi-branch fractional slot stator winding arrangement scheme is usually based on the pole phase group. Each phase winding adopts the principle of proximity, and the coils of adjacent pole phase groups are connected in series or in parallel. The branches of each phase winding are evenly distributed within the whole circle, but the single branch is not evenly distributed within the whole circle in terms of spatial distribution. At this time, when the stator winding adopts a multi-branch winding scheme, such as Figure 7 As shown, the asymmetric structure of the rotor magnetic circuit will cause some adverse effects such as vibration and noise, and in severe cases, the motor may even become unusable. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a stator winding of a fractional slot permanent magnet motor with a full-circle distribution, in which the rotor magnetic circuit is relatively symmetrical as a whole, the motor rotates stably and the noise generated during operation is relatively small.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a stator winding of a fractional slot permanent magnet motor with full-circle distribution, including a plurality of coils arranged in stator slots of a stator core, a plurality of the coils forming a three-phase winding, the three-phase winding being a fractional slot double-layer short-distance distributed winding, the number of stator slots of the three-phase winding being 36, the total number of coils being 36, the number of motor poles being 8, the number of pole-phase groups being 24, the number of slots per pole per phase being 1.5, the number of parallel branches being 2, the three phases of the three-phase winding comprising an AX phase, a BY phase and a CZ phase, the first branch of the AX phase, the second branch of the AX phase, the first branch of the BY phase, the second branch of the BY phase, the first branch of the CZ phase and the second branch of the BY phase. The temporal and spatial distributions of each coil in the second branch of the CZ phase are arranged symmetrically within the entire circle; the current of the first branch of the AX phase is input from coil No. 28 and output from coil No. 24, the current of the second branch of the AX phase is input from coil No. 1 and output from coil No. 33, the current of the first branch of the BY phase is input from coil No. 31 and output from coil No. 27, the current of the second branch of the BY phase is input from coil No. 4 and output from coil No. 36, the current of the first branch of the CZ phase is input from coil No. 34 and output from coil No. 30, and the current of the second branch of the CZ phase is input from coil No. 7 and output from coil No. 3.

[0006] Compared with the prior art, the advantage of the present invention is that the coils belonging to the same pole phase group in the original winding structure are broken up, and the coils of each phase are connected in series or in parallel according to the principle of whole circle distribution. The arrangement scheme makes the single branch of each phase winding adopt the principle of symmetry within the whole circle in terms of time and space distribution, avoiding the problem of unbalanced magnetic circuit between each branch of the stator due to the unbalanced rotor magnetic circuit design. The rotor magnetic circuit is more symmetrical as a whole, the motor rotates stably and the noise generated during operation is small.

[0007] Specifically, the first branch of the AX phase is composed of coil No. 28, coil No. 2, coil No. 6, coil No. 10, coil No. 20 and coil No. 24, which are sequentially distributed according to the direction of current flow; the second branch of the AX phase is composed of coil No. 1, coil No. 11, coil No. 15, coil No. 19, coil No. 29 and coil No. 33, which are sequentially distributed according to the direction of current flow; the current direction of coil No. 1, coil No. 2, coil No. 10, coil No. 11, coil No. 19, coil No. 20, coil No. 28 and coil No. 29 is clockwise, and the current direction of coil No. 6, coil No. 15, coil No. 24 and coil No. 33 is counterclockwise; The first branch of the BY phase is connected in sequence by coil No. 31, coil No. 5, coil No. 9, coil No. 13, coil No. 23 and coil No. 27, which are sequentially distributed according to the direction of current flow; the second branch of the BY phase is composed of coil No. 4, coil No. 14, coil No. 18, coil No. 22, coil No. 32 and coil No. 36, which are sequentially distributed according to the direction of current flow; the current direction of coil No. 4, coil No. 5, coil No. 13, coil No. 14, coil No. 22, coil No. 23, coil No. 31 and coil No. 32 is clockwise, and the current direction of coil No. 9, coil No. 18, coil No. 27 and coil No. 36 is counterclockwise; The first branch of the CZ phase is composed of coil No. 34, coil No. 8, coil No. 12, coil No. 16, coil No. 26 and coil No. 30, which are sequentially distributed according to the direction of current flow; the second branch of the CZ phase is composed of coil No. 7, coil No. 17, coil No. 21, coil No. 25, coil No. 35 and coil No. 3, which are sequentially distributed according to the direction of current flow. The current direction of coil No. 7, coil No. 8, coil No. 16, coil No. 17, coil No. 25, coil No. 26, coil No. 34 and coil No. 35 is clockwise, and the current direction of coil No. 3, coil No. 12, coil No. 21 and coil No. 30 is counterclockwise. The above arrangement scheme of coil windings breaks up the coils in the same pole phase group, and connects the coils of each phase in series or in parallel according to the principle of full circle distribution, so that the single branch of each phase winding adopts the principle of symmetry within the full circle in terms of time and space distribution, thereby improving the rotation stability.

[0008] Specifically, in the first branch of the AX phase, the coil No. 28 is connected to the coil No. 2 through the first bridge line, the coil No. 2 is connected to the coil No. 6 through the second bridge line, the coil No. 6 is connected to the coil No. 10 through the third bridge line, the coil No. 10 is connected to the coil No. 20 through the fourth bridge line, and the coil No. 20 is connected to the coil No. 24 through the fifth bridge line; in the second branch of the AX phase, the coil No. 1 is connected to the coil No. 11 through the sixth bridge line, the coil No. 11 is connected to the coil No. 15 through the seventh bridge line, the coil No. 15 is connected to the coil No. 19 through the eighth bridge line, the coil No. 19 is connected to the coil No. 29 through the ninth bridge line, and the coil No. 29 is connected to the coil No. 33 through the tenth bridge line; In the first branch of the BY phase, the coil No. 31 is connected to the coil No. 5 through the eleventh bridge line, the coil No. 5 is connected to the coil No. 9 through the twelfth bridge line, the coil No. 9 is connected to the coil No. 13 through the thirteenth bridge line, the coil No. 13 is connected to the coil No. 23 through the fourteenth bridge line, and the coil No. 23 is connected to the coil No. 27 through the fifteenth bridge line; in the second branch of the BY phase, the coil No. 4 is connected to the coil No. 14 through the sixteenth bridge line, the coil No. 14 is connected to the coil No. 18 through the seventeenth bridge line, the coil No. 18 is connected to the coil No. 22 through the eighteenth bridge line, the coil No. 22 is connected to the coil No. 32 through the nineteenth bridge line, and the coil No. 32 is connected to the coil No. 36 through the twentieth bridge line; In the first branch of the CZ phase, the No. 34 coil is connected to the No. 8 coil through the 21st bridge wire, the No. 8 coil is connected to the No. 12 coil through the 22nd bridge wire, the No. 12 coil is connected to the No. 16 coil through the 23rd bridge wire, the No. 16 coil is connected to the No. 26 coil through the 24th bridge wire, and the No. 26 coil is connected to the No. 30 coil through the 25th bridge wire; in the second branch of the CZ phase, the No. 7 coil is connected to the No. 17 coil through the 26th bridge wire, the No. 17 coil is connected to the No. 21 coil through the 27th bridge wire, the No. 21 coil is connected to the No. 25 coil through the 28th bridge wire, the No. 25 coil is connected to the No. 35 coil through the 29th bridge wire, and the No. 35 coil is connected to the No. 3 coil through the 30th bridge wire. The setting of each bridge wire enables each coil to be connected across a longer spacing, and finally forms a winding connection scheme distributed in a whole circle.

[0009] Specifically, the winding paths of the first branch of the AX phase are: slot No. 28 (lower), slot No. 32 (upper), slot No. 2 (lower), slot No. 6 (upper), slot No. 10 (upper), slot No. 6 (lower), slot No. 10 (lower), slot No. 14 (upper), slot No. 20 (lower), slot No. 24 (upper), slot No. 28 (upper), slot No. 24 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the AX phase are: slot 1 (lower), slot 5 (upper), slot 11 (lower), slot 15 (upper), slot 19 (upper), slot 15 (lower), slot 19 (lower), slot 23 (upper), slot 29 (lower), slot 33 (upper), slot 1 (upper), and slot 33 (lower).

[0010] Specifically, the winding paths of the first branch of the BY phase are: slot 31 (lower), slot 35 (upper), slot 5 (lower), slot 9 (upper), slot 13 (upper), slot 9 (lower), slot 13 (lower), slot 17 (upper), slot 23 (lower), slot 27 (upper), slot 31 (upper), slot 27 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the BY phase are: slot No. 4 (lower), slot No. 8 (upper), slot No. 14 (lower), slot No. 18 (upper), slot No. 22 (upper), slot No. 18 (lower), slot No. 22 (lower), slot No. 26 (upper), slot No. 32 (lower), slot No. 36 (upper), slot No. 4 (upper), slot No. 36 (lower).

[0011] Specifically, the winding paths of the first branch of the CZ phase are: slot 34 (lower), slot 2 (upper), slot 8 (lower), slot 12 (upper), slot 16 (upper), slot 12 (lower), slot 16 (lower), slot 20 (upper), slot 26 (lower), slot 30 (upper), slot 34 (upper), slot 30 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the CZ phase are: slot No. 7 (lower), slot No. 11 (upper), slot No. 17 (lower), slot No. 21 (upper), slot No. 25 (upper), slot No. 21 (lower), slot No. 25 (lower), slot No. 29 (upper), slot No. 35 (lower), slot No. 3 (upper), slot No. 7 (upper), slot No. 3 (lower). BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The specific winding structure of the AX phase in Example 1 of the present invention; Figure 2 The specific winding structure of the BY phase in Example 1 of the present invention; Figure 3 The specific winding structure of the CZ phase in Example 1 of the present invention; Figure 4 The specific winding structure of the AX phase in Example 1 of the present invention; Figure 5 The specific winding structure of the BY phase in Example 1 of the present invention; Figure 6 The specific winding structure of the CZ phase in Example 1 of the present invention; Figure 7 This is the specific winding structure of the AX phase in the prior art. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings.

[0014] A stator winding of a fractional slot permanent magnet motor with full-circle distribution includes a plurality of coils arranged in stator slots of a stator core, the plurality of coils constitute a three-phase winding, the three-phase winding is a fractional slot double-layer short-distance distribution winding, the number of stator slots of the three-phase winding is 36, the total number of coils is 36, the number of motor poles is 8, the number of pole-phase groups is 24, the number of slots per pole per phase is 1.5, the number of parallel branches is 2, the three phases of the three-phase winding include AX phase, BY phase and CZ phase, the first branch of the AX phase, the second branch of the AX phase, the first branch of the BY phase, the second branch of the BY phase, the first branch of the CZ phase and the second branch of the CZ phase are all arranged symmetrically within the full circle in terms of time and space. It should be noted that the number of each coil is the same as the number of the stator slot where the end of the coil close to the outer circle side of the stator core is located, for example, coil No. 1 is defined as the coil with one end located in slot No. 1 close to the outer circle side of the stator core.

[0015] Example 1: like Figure 1 to Figure 3As shown, the first branch of the AX phase is composed of coil No. 28 A28a, coil No. 2 A2a, coil No. 6 A6a, coil No. 10 A10a, coil No. 20 A20a and coil No. 24 A24a, which are sequentially distributed according to the direction of current flow, and the second branch of the AX phase is composed of coil No. 1 A1b, coil No. 11 A11b, coil No. 15 A15b, coil No. 19 A19b, coil No. 29 A29b and coil No. 33, which are sequentially distributed according to the direction of current flow. The current direction of coil No. 1 A1b, coil No. 2 A2a, coil No. 10 A10a, coil No. 11 A11b, coil No. 19 A19b, coil No. 20 A20a, coil No. 28 A28a and coil No. 29 A29b is clockwise, and the current direction of coil No. 6 A6a, coil No. 15 A15b, coil No. 24 A24a and coil No. 33 A33b is counterclockwise; in the first branch of phase AX, coil No. 28 Coil A28a is connected to coil A2a No. 2 via the first bridge line L1, coil A2a No. 2 is connected to coil A6a No. 6 via the second bridge line L2, coil A6a No. 6 is connected to coil A10a No. 10 via the third bridge line L3, coil A10a No. 10 is connected to coil A20a No. 20 via the fourth bridge line L4, coil A20a No. 20 is connected to coil A24a No. 24 via the fifth bridge line L5; in the second branch of phase AX, Coil No. 1 A1b is connected to coil No. 11 A11b through the sixth bridge wire L6, coil No. 11 A11b is connected to coil No. 15 A15b through the seventh bridge wire L7, coil No. 15 A15b is connected to coil No. 19 A19b through the eighth bridge wire L8, coil No. 19 A19b is connected to coil No. 29 A29b through the ninth bridge wire L9, and coil No. 29 A29b is connected to coil No. 33 A33b through the tenth bridge wire L10.

[0016] The winding paths of the first branch of the AX phase are: slot 28 (lower), slot 32 (upper), slot 2 (lower), slot 6 (upper), slot 10 (upper), slot 6 (lower), slot 10 (lower), slot 14 (upper), slot 20 (lower), slot 24 (upper), slot 28 (upper), slot 24 (lower), where "(lower)" indicates the outer circle side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circle side of the corresponding stator slot close to the stator core; The winding paths of the second branch of phase AX are as follows: slot 1 (lower), slot 5 (upper), slot 11 (lower), slot 15 (upper), slot 19 (upper), slot 15 (lower), slot 19 (lower), slot 23 (upper), slot 29 (lower), slot 33 (upper), slot 1 (upper), and slot 33 (lower).

[0017] The first branch of the BY phase is connected in sequence with coil No. 31 B31a, coil No. 5 B5a, coil No. 9 B9a, coil No. 13 B13a, coil No. 23 B23a and coil No. 27 B27a, which are distributed in sequence according to the direction of current flow; the second branch of the BY phase is connected in sequence with coil No. 4 B4b, coil No. 14 B14b, coil No. 18 B18b, coil No. 22 B22b, coil No. 32 B32b and coil No. 36 B36, which are distributed in sequence according to the direction of current flow. b, the current direction of coil No. 4 B4b, coil No. 5 B5a, coil No. 13 B13a, coil No. 14 B14b, coil No. 22 B22b, coil No. 23 B23a, coil No. 31 B31a and coil No. 32 B32b is clockwise, and the current direction of coil No. 9 B9a, coil No. 18 B18b, coil No. 27 B27a and coil No. 36 B36b is counterclockwise; in the first branch of BY phase, coil No. 31 B31a passes through the tenth The first bridge wire L11 is connected to the No. 5 coil B5a, the No. 5 coil B5a is connected to the No. 9 coil B9a through the twelfth bridge wire L12, the No. 9 coil B9a is connected to the No. 13 coil B13a through the thirteenth bridge wire L13, the No. 13 coil B13a is connected to the No. 23 coil B23a through the fourteenth bridge wire L14, the No. 23 coil B23a is connected to the No. 27 coil B27a through the fifteenth bridge wire L15; in the second branch of the BY phase, the No. 4 coil B4b is connected to coil No. 14 B14b through the sixteenth bridge wire L16, coil No. 14 B14b is connected to coil No. 18 B18b through the seventeenth bridge wire L17, coil No. 18 B18b is connected to coil No. 22 B22b through the eighteenth bridge wire L18, coil No. 22 B22b is connected to coil No. 32 B32b through the nineteenth bridge wire L19, and coil No. 32 B32b is connected to coil No. 36 B36b through the twentieth bridge wire L20.

[0018] The winding paths of the first branch of the BY phase are: slot 31 (lower), slot 35 (upper), slot 5 (lower), slot 9 (upper), slot 13 (upper), slot 9 (lower), slot 13 (lower), slot 17 (upper), slot 23 (lower), slot 27 (upper), slot 31 (upper), slot 27 (lower), where "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the BY phase are: slot 4 (lower), slot 8 (upper), slot 14 (lower), slot 18 (upper), slot 22 (upper), slot 18 (lower), slot 22 (lower), slot 26 (upper), slot 32 (lower), slot 36 (upper), slot 4 (upper), and slot 36 (lower).

[0019] The first branch of the CZ phase consists of coil No. 34 C34a, coil No. 8 C8a, coil No. 12 C12a, coil No. 16 C16a, coil No. 26 C26a and coil No. 30 C30a, which are distributed in sequence according to the direction of current flow; the second branch of the CZ phase consists of coil No. 7 C7b, coil No. 17 C17b, coil No. 21 C21b, coil No. 25 C25b, coil No. 35 C35b and coil No. 3 C3b, which are distributed in sequence according to the direction of current flow. The current directions of coil No. 7 C7b, coil No. 8 C8a, coil No. 16 C16a, coil No. 17 C17b, coil No. 25 C25b, coil No. 26 C26a, coil No. 34 C34a and coil No. 35 C35b are clockwise, and the current directions of coil No. 3 C3b, coil No. 12 C12a, coil No. 21 C21b and coil No. 30 C30a are counterclockwise; in the first branch of phase CZ, coil No. 34 C34a passes through the twenty-first bridge line L 21 is connected to coil No. 8 C8a, coil No. 8 C8a is connected to coil No. 12 C12a through the 22nd bridge wire L22, coil No. 12 C12a is connected to coil No. 16 C16a through the 23rd bridge wire L23, coil No. 16 C16a is connected to coil No. 26 C26a through the 24th bridge wire L24, coil No. 26 C26a is connected to coil No. 30 C30a through the 25th bridge wire L25; in the second branch of phase CZ, coil No. 7 C7b is connected to coil No. 17 C17b through the twenty-sixth bridge wire L26, coil No. 17 C17b is connected to coil No. 21 C21b through the twenty-seventh bridge wire L27, coil No. 21 C21b is connected to coil No. 25 C25b through the twenty-eighth bridge wire L28, coil No. 25 C25b is connected to coil No. 35 C35b through the twenty-ninth bridge wire L29, and coil No. 35 C35b is connected to coil No. 3 C3b through the thirtieth bridge wire L30.

[0020] The winding paths of the first branch of the CZ phase are: slot 34 (lower), slot 2 (upper), slot 8 (lower), slot 12 (upper), slot 16 (upper), slot 12 (lower), slot 16 (lower), slot 20 (upper), slot 26 (lower), slot 30 (upper), slot 34 (upper), slot 30 (lower), where "(lower)" indicates the outer circle side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circle side of the corresponding stator slot close to the stator core; The winding paths of the second branch of phase CZ are: slot 7 (lower), slot 11 (upper), slot 17 (lower), slot 21 (upper), slot 25 (upper), slot 21 (lower), slot 25 (lower), slot 29 (upper), slot 35 (lower), slot 3 (upper), slot 7 (upper), and slot 3 (lower).

[0021] Example 2: like Figures 4 to 6 As shown, the rest of the structure is the same as Example 1, the difference is that in the AX phase, the current direction of coil No. 1 A1b, coil No. 2 A2a, coil No. 10 A10a, coil No. 11 A11b, coil No. 19 A19b, coil No. 20 A20a, coil No. 28 A28a and coil No. 29 A29b is counterclockwise, and the current direction of coil No. 6 A6a, coil No. 15 A15b, coil No. 24 A24a and coil No. 33 A33b is clockwise; in the BY phase, coil No. 4 B4b, coil No. 5 B5a, coil No. 13 B13a, coil No. 14 B14b, coil No. 22 B22b, coil No. 23 B The current direction of coil No. 23a, No. 31 B31a and No. 32 B32b is counterclockwise, and the current direction of coil No. 9 B9a, coil No. 18 B18b, coil No. 27 B27a and coil No. 36 B36b is clockwise; in phase CZ, the current direction of coil No. 7 C7b, coil No. 8 C8a, coil No. 16 C16a, coil No. 17 C17b, coil No. 25 C25b, coil No. 26 C26a, coil No. 34 C34a and coil No. 35 C35b is counterclockwise, and the current direction of coil No. 3 C3b, coil No. 12 C12a, coil No. 21 C21b and coil No. 30 C30a is clockwise.

[0022] The basic principle of Example 2 is the same as that of Example 1. The difference is that the direction of the current in each coil is changed, and the position and direction of the corresponding coil and bridge line will also change. However, the overall design is still based on the original intention of full-circle distribution. When working, the overall magnetic field distribution is more uniform, and the motor is not prone to jitter during operation. Therefore, the rotation is smoother and the working noise is smaller.

Claims

1. A stator winding of a fractional slot permanent magnet motor with full-circle distribution, comprising a plurality of coils arranged in stator slots of a stator core, wherein the plurality of coils constitute a three-phase winding, wherein the three-phase winding is a fractional slot double-layer short-distance distribution winding, wherein the number of stator slots of the three-phase winding is 36, the total number of coils is 36, the number of motor poles is 8, the number of pole-phase groups is 24, the number of slots per pole per phase is 1.5, the number of parallel branches is 2, and the three phases of the three-phase winding include AX phase, BY phase and CZ phase, characterized in that The temporal and spatial distribution of each coil in the first branch of the AX phase, the second branch of the AX phase, the first branch of the BY phase, the second branch of the BY phase, the first branch of the CZ phase, and the second branch of the CZ phase within the corresponding branch is arranged symmetrically within the whole circle; The current of the first branch of the AX phase is input from coil No. 28 and output from coil No. 24, the current of the second branch of the AX phase is input from coil No. 1 and output from coil No. 33, the current of the first branch of the BY phase is input from coil No. 31 and output from coil No. 27, the current of the second branch of the BY phase is input from coil No. 4 and output from coil No. 36, the current of the first branch of the CZ phase is input from coil No. 34 and output from coil No. 30, and the current of the second branch of the CZ phase is input from coil No. 7 and output from coil No.

3.

2. The stator winding of a permanent magnet motor with fractional slots distributed in a full circle according to claim 1, characterized in that The first branch of the AX phase is composed of coil No. 28, coil No. 2, coil No. 6, coil No. 10, coil No. 20 and coil No. 24, which are sequentially distributed according to the direction of current flow; the second branch of the AX phase is composed of coil No. 1, coil No. 11, coil No. 15, coil No. 19, coil No. 29 and coil No. 33, which are sequentially distributed according to the direction of current flow; the current direction of coil No. 1, coil No. 2, coil No. 10, coil No. 11, coil No. 19, coil No. 20, coil No. 28 and coil No. 29 is clockwise, and the current direction of coil No. 6, coil No. 15, coil No. 24 and coil No. 33 is counterclockwise; The first branch of the BY phase is connected in sequence by coil No. 31, coil No. 5, coil No. 9, coil No. 13, coil No. 23 and coil No. 27, which are sequentially distributed according to the direction of current flow; the second branch of the BY phase is composed of coil No. 4, coil No. 14, coil No. 18, coil No. 22, coil No. 32 and coil No. 36, which are sequentially distributed according to the direction of current flow; the current direction of coil No. 4, coil No. 5, coil No. 13, coil No. 14, coil No. 22, coil No. 23, coil No. 31 and coil No. 32 is clockwise, and the current direction of coil No. 9, coil No. 18, coil No. 27 and coil No. 36 is counterclockwise; The first branch of the CZ phase is composed of coil No. 34, coil No. 8, coil No. 12, coil No. 16, coil No. 26 and coil No. 30, which are distributed in sequence according to the direction of current flow; the second branch of the CZ phase is composed of coil No. 7, coil No. 17, coil No. 21, coil No. 25, coil No. 35 and coil No. 3, which are distributed in sequence according to the direction of current flow. The current direction of coil No. 7, coil No. 8, coil No. 16, coil No. 17, coil No. 25, coil No. 26, coil No. 34 and coil No. 35 is clockwise, and the current direction of coil No. 3, coil No. 12, coil No. 21 and coil No. 30 is counterclockwise.

3. The stator winding of the permanent magnet motor with full-circle distribution of fractional slots according to claim 2 is characterized in that In the first branch of the AX phase, the coil No. 28 is connected to the coil No. 2 through the first bridge line, the coil No. 2 is connected to the coil No. 6 through the second bridge line, the coil No. 6 is connected to the coil No. 10 through the third bridge line, the coil No. 10 is connected to the coil No. 20 through the fourth bridge line, and the coil No. 20 is connected to the coil No. 24 through the fifth bridge line; in the second branch of the AX phase, the coil No. 1 is connected to the coil No. 11 through the sixth bridge line, the coil No. 11 is connected to the coil No. 15 through the seventh bridge line, the coil No. 15 is connected to the coil No. 19 through the eighth bridge line, the coil No. 19 is connected to the coil No. 29 through the ninth bridge line, and the coil No. 29 is connected to the coil No. 33 through the tenth bridge line; In the first branch of the BY phase, the coil No. 31 is connected to the coil No. 5 through the eleventh bridge line, the coil No. 5 is connected to the coil No. 9 through the twelfth bridge line, the coil No. 9 is connected to the coil No. 13 through the thirteenth bridge line, the coil No. 13 is connected to the coil No. 23 through the fourteenth bridge line, and the coil No. 23 is connected to the coil No. 27 through the fifteenth bridge line; in the second branch of the BY phase, the coil No. 4 is connected to the coil No. 14 through the sixteenth bridge line, the coil No. 14 is connected to the coil No. 18 through the seventeenth bridge line, the coil No. 18 is connected to the coil No. 22 through the eighteenth bridge line, the coil No. 22 is connected to the coil No. 32 through the nineteenth bridge line, and the coil No. 32 is connected to the coil No. 36 through the twentieth bridge line; In the first branch of the CZ phase, the coil No. 34 is connected to the coil No. 8 through the twenty-first bridge line, the coil No. 8 is connected to the coil No. 12 through the twenty-second bridge line, the coil No. 12 is connected to the coil No. 16 through the twenty-third bridge line, the coil No. 16 is connected to the coil No. 26 through the twenty-fourth bridge line, and the coil No. 26 is connected to the coil No. 30 through the twenty-fifth bridge line; in the second branch of the CZ phase, the coil No. 7 is connected to the coil No. 17 through the twenty-sixth bridge line, the coil No. 17 is connected to the coil No. 21 through the twenty-seventh bridge line, the coil No. 21 is connected to the coil No. 25 through the twenty-eighth bridge line, the coil No. 25 is connected to the coil No. 35 through the twenty-ninth bridge line, and the coil No. 35 is connected to the coil No. 3 through the thirtieth bridge line.

4. The stator winding of a permanent magnet motor with fractional slots distributed in a full circle according to claim 3 is characterized in that The winding paths of the first branch of the AX phase are: slot 28 (lower), slot 32 (upper), slot 2 (lower), slot 6 (upper), slot 10 (upper), slot 6 (lower), slot 10 (lower), slot 14 (upper), slot 20 (lower), slot 24 (upper), slot 28 (upper), slot 24 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the AX phase are: slot 1 (lower), slot 5 (upper), slot 11 (lower), slot 15 (upper), slot 19 (upper), slot 15 (lower), slot 19 (lower), slot 23 (upper), slot 29 (lower), slot 33 (upper), slot 1 (upper), and slot 33 (lower).

5. The stator winding of the permanent magnet motor with fractional slots distributed in a full circle according to claim 4, characterized in that The winding paths of the first branch of the BY phase are: slot 31 (lower), slot 35 (upper), slot 5 (lower), slot 9 (upper), slot 13 (upper), slot 9 (lower), slot 13 (lower), slot 17 (upper), slot 23 (lower), slot 27 (upper), slot 31 (upper), slot 27 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the BY phase are: slot No. 4 (lower), slot No. 8 (upper), slot No. 14 (lower), slot No. 18 (upper), slot No. 22 (upper), slot No. 18 (lower), slot No. 22 (lower), slot No. 26 (upper), slot No. 32 (lower), slot No. 36 (upper), slot No. 4 (upper), slot No. 36 (lower).

6. The stator winding of the permanent magnet motor with fractional slots distributed in a full circle according to claim 5, characterized in that The winding paths of the first branch of the CZ phase are: slot 34 (lower), slot 2 (upper), slot 8 (lower), slot 12 (upper), slot 16 (upper), slot 12 (lower), slot 16 (lower), slot 20 (upper), slot 26 (lower), slot 30 (upper), slot 34 (upper), slot 30 (lower), wherein "(lower)" indicates the outer circumferential side of the corresponding stator slot close to the stator core, and "(upper)" indicates the inner circumferential side of the corresponding stator slot close to the stator core; The winding paths of the second branch of the CZ phase are: slot No. 7 (lower), slot No. 11 (upper), slot No. 17 (lower), slot No. 21 (upper), slot No. 25 (upper), slot No. 21 (lower), slot No. 25 (lower), slot No. 29 (upper), slot No. 35 (lower), slot No. 3 (upper), slot No. 7 (upper), slot No. 3 (lower).

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