A stator winding of a double-layer integer-slot permanent magnet motor

Abstract

The application discloses a kind of stator winding of double-layer integer-slot permanent magnet motor, including multiple coils arranged in stator slot, define the motor pole number of stator winding as m, stator slot number is N, phase number is k, k=3, and N / (mk) is integer, the characteristics are the number of coil in each phase c=2N / (mk), the coil in the same phase is divided into first coil group and second coil group, and the winding path of each coil is set according to a specific rule, and finally the structure of the whole stator winding is formed by the cooperation of initial connection section and corresponding compensation connection section;The advantage is that by changing the coil connection mode of the single branch in the original motor stator winding, four uniform magnetic density regions are formed in the entire circumferential range, and if the motor rotor is eccentric, this winding connection mode can effectively offset the influence of rotor eccentricity when current is input.

Description

Technical Field

[0001] This invention relates to a stator winding structure, and more particularly to a stator winding of a double-layer integer slot permanent magnet motor. Background Technology

[0002] Permanent magnet motors have been widely used in high-performance rotating motors in industries such as industry, medicine, and aerospace in recent years. However, due to limitations in installation processes, it is impossible to perfectly align the stator center point with the rotor center point, resulting in rotor eccentricity. Existing solutions to problems such as changes in no-load back EMF, reduced power factor, and increased vibration and noise caused by rotor eccentricity in permanent magnet motors mostly focus on control strategies, such as harmonic current injection and dynamic slip vector control. These require significant investment from manufacturers. Other solutions involve adding a control winding to the motor, which also increases manufacturing costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stator winding of a double-layer integer slot permanent magnet motor with less structural modification and lower cost. If the motor rotor is eccentric, the influence of rotor eccentricity can be offset when current is applied.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problem is as follows: a stator winding of a double-layer integer slot permanent magnet motor, comprising multiple coils disposed in stator slots, wherein the number of motor poles of the stator winding is defined as m, the number of stator slots as N, and the number of phases as k, k = 3, and N / (mk) is an integer, the number of coils in each phase is c = 2N / (mk), and the c coils are equally divided into a first coil group and a second coil group, each coil in the first coil group is defined as an initial coil and numbered sequentially, and two adjacent initial coils in the first coil group... The difference in the starting slot number is 1. Each initial coil has a unique corresponding compensation coil in the second coil group. The compensation coil has the same serial number as the corresponding initial coil. The initial coil consists of (N / m-1) initial connecting segments connected end to end and numbered sequentially. The compensation coil consists of (N / m-1) compensation connecting segments connected end to end and numbered sequentially. The number of slots n1 occupied by the initial connecting segments with odd serial numbers is N / m, and the number of slots n2 occupied by the initial connecting segments with even serial numbers is N / m+2.

[0005] In the compensation coil corresponding to the initial coil, the starting slot number of each compensation connection segment is the slot number of the initial connection segment with the same sequence number plus the difference α, where α = N / m, and the number of slots occupied by the compensation connection segment with the same sequence number is the same as that of the initial connection segment.

[0006] The starting slot number of the initial coil in the next phase is the starting slot number of the initial coil with the same sequence number in the previous phase plus the difference β, where β = 2N / (mk).

[0007] Compared with existing technologies, the advantages of this invention lie in that it simply changes the coil connection method of a single branch in the stator winding of the original motor, dividing the coils in the same phase into a first coil group and a second coil group, and setting the winding path of each coil according to a specific rule. Finally, through the cooperation of the initial connection section and the corresponding compensation connection section, four uniform magnetic flux density regions are formed throughout the entire circumference. If the motor rotor is eccentric, this winding connection method can effectively counteract the influence of rotor eccentricity when current is applied. Comparative calculations using the A-phase winding show that the magnetic flux density imbalance of the A-phase winding in this invention is only 0.67%, while the imbalance of the A-phase winding in a conventional motor is 2.61%. This proves that the stator winding connection method of this invention can effectively reduce the magnetic flux density imbalance caused by eccentricity, i.e., effectively reduce the imbalance of no-load back EMF. Furthermore, the setting of the initial connection section and the compensation connection section ensures that the connection length of each coil is sufficient while maintaining good overall magnetic flux density balance.

[0008] Specifically, the stator winding has 4 motor poles m, 24 stator slots N, 3 phases k, and 4 coils in each phase. The stator winding is defined as including the A-phase winding, B-phase winding and C-phase winding of the first type of stator. Each stator slot is numbered sequentially, and the p-th stator slot is denoted as slot p, where 1 ≤ p ≤ 24.

[0009] The A-phase winding of the first type of stator includes a first A-phase coil, a second A-phase coil, a third A-phase coil, and a fourth A-phase coil. The winding path of the first A-phase coil is: upper layer of slot 1, lower layer of slot 6, upper layer of slot 13, and lower layer of slot 18; the winding path of the second A-phase coil is: upper layer of slot 2, lower layer of slot 7, upper layer of slot 14, and lower layer of slot 19; the winding path of the third A-phase coil is: upper layer of slot 7, lower layer of slot 12, upper layer of slot 19, and lower layer of slot 24; and the winding path of the fourth A-phase coil is: upper layer of slot 8, lower layer of slot 13, upper layer of slot 20, and lower layer of slot 1.

[0010] The B-phase winding of the first type of stator includes a first B-phase coil, a second B-phase coil, a third B-phase coil, and a fourth B-phase coil. The winding path of the first B-phase coil is: upper layer of slot 5, lower layer of slot 10, upper layer of slot 17, and lower layer of slot 22; the winding path of the second B-phase coil is: upper layer of slot 6, lower layer of slot 11, upper layer of slot 18, and lower layer of slot 23; the winding path of the third B-phase coil is: upper layer of slot 11, lower layer of slot 16, upper layer of slot 23, and lower layer of slot 4; the winding path of the fourth B-phase coil is: upper layer of slot 12, lower layer of slot 17, upper layer of slot 24, and lower layer of slot 5.

[0011] The first type of stator's C-phase winding includes a first C-phase coil, a second C-phase coil, a third C-phase coil, and a fourth C-phase coil. The winding path of the first C-phase coil is: upper layer of slot 9, lower layer of slot 14, upper layer of slot 21, and lower layer of slot 2. The winding path of the second C-phase coil is: upper layer of slot 10, lower layer of slot 15, upper layer of slot 22, and lower layer of slot 3. The winding path of the third C-phase coil is: upper layer of slot 15, lower layer of slot 20, upper layer of slot 3, and lower layer of slot 8. The winding path of the fourth C-phase coil is: upper layer of slot 16, lower layer of slot 21, upper layer of slot 4, and lower layer of slot 9.

[0012] Another stator winding structure is as follows: the number of motor poles m = 4, the number of stator slots N = 48, the number of phases k = 3, and the number of coils in each phase c = 8. In this case, the stator winding is defined as including the A-phase winding of the second type of stator, the B-phase winding of the second type of stator, and the C-phase winding of the second type of stator. Each stator slot is numbered sequentially, and the q-th stator slot is denoted as slot number q, where 1 ≤ q ≤ 48.

[0013] The second-type stator's A-phase winding includes the second-type stator's A-phase first coil, second coil, third coil, fourth coil, fifth coil, sixth coil, seventh coil, and eighth coil. The winding path of the second-type stator's A-phase first coil is: upper layer of slot 1, lower layer of slot 12, upper layer of slot 25, and lower layer of slot 36. The winding path of the second-type stator's A-phase second coil is: upper layer of slot 2, lower layer of slot 13, upper layer of slot 26, and lower layer of slot 37. The winding path of the second-type stator's A-phase third coil is: upper layer of slot 3, lower layer of slot 14, and lower layer of slot 27. The winding path of the fourth coil of phase A in the second type of stator is: upper layer of slot 4, lower layer of slot 15, upper layer of slot 28, lower layer of slot 39; the winding path of the fifth coil of phase A in the second type of stator is: upper layer of slot 13, lower layer of slot 24, upper layer of slot 37, lower layer of slot 48; the winding path of the sixth coil of phase A in the second type of stator is: upper layer of slot 14, lower layer of slot 25, upper layer of slot 38, lower layer of slot 1; the winding path of the seventh coil of phase A in the second type of stator is: upper layer of slot 15, lower layer of slot 26, upper layer of slot 39, lower layer of slot 2; the winding path of the eighth coil of phase A in the second type of stator is: upper layer of slot 16, lower layer of slot 27, upper layer of slot 40, lower layer of slot 3.

[0014] The B-phase winding of the second type of stator includes the first, second, third, fourth, fifth, sixth, and seventh B-phase coils of the second type of stator, and the eighth B-phase coil of the second type of stator. The winding path of the first B-phase coil of the second type of stator is: upper layer of slot 9, lower layer of slot 20, upper layer of slot 33, and lower layer of slot 44; the winding path of the second B-phase coil of the second type of stator is: upper layer of slot 10, lower layer of slot 21, upper layer of slot 34, and lower layer of slot 45; the winding path of the third B-phase coil of the second type of stator is: upper layer of slot 11, lower layer of slot 22, and lower layer of slot 35. The winding path of the fourth coil of phase B in the second type of stator is: upper layer of slot 12, lower layer of slot 23, upper layer of slot 36, lower layer of slot 47; the winding path of the fifth coil of phase B in the second type of stator is: upper layer of slot 21, lower layer of slot 32, upper layer of slot 45, lower layer of slot 8; the winding path of the sixth coil of phase B in the second type of stator is: upper layer of slot 22, lower layer of slot 33, upper layer of slot 46, lower layer of slot 9; the winding path of the seventh coil of phase B in the second type of stator is: upper layer of slot 23, lower layer of slot 34, upper layer of slot 47, lower layer of slot 10; the winding path of the eighth coil of phase B in the second type of stator is: upper layer of slot 24, lower layer of slot 35, upper layer of slot 48, lower layer of slot 11.

[0015] The C-phase winding of the second type of stator includes the first, second, third, fourth, fifth, sixth, and seventh C-phase coils of the second type of stator, and the eighth C-phase coil of the second type of stator. The winding path of the first C-phase coil is: upper layer of slot 17, lower layer of slot 28, upper layer of slot 41, and lower layer of slot 4; the winding path of the second C-phase coil is: upper layer of slot 18, lower layer of slot 29, upper layer of slot 42, and lower layer of slot 5; the winding path of the third C-phase coil is: upper layer of slot 19, lower layer of slot 30, and lower layer of slot 43. The winding path of the fourth coil of phase C in the second type of stator is: upper layer of slot 20, lower layer of slot 31, upper layer of slot 44, lower layer of slot 7; the winding path of the fifth coil of phase C in the second type of stator is: upper layer of slot 29, lower layer of slot 40, upper layer of slot 5, lower layer of slot 16; the winding path of the sixth coil of phase C in the second type of stator is: upper layer of slot 30, lower layer of slot 41, upper layer of slot 6, lower layer of slot 17; the winding path of the seventh coil of phase C in the second type of stator is: upper layer of slot 31, lower layer of slot 42, upper layer of slot 7, lower layer of slot 18; the winding path of the eighth coil of phase C in the second type of stator is: upper layer of slot 32, lower layer of slot 43, upper layer of slot 8, lower layer of slot 19. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection structure of phase A winding in Example 1;

[0017] Figure 2 This is a schematic diagram of the connection structure of phase B winding in Example 1;

[0018] Figure 3 This is a schematic diagram of the connection structure of the C-phase winding in Example 1;

[0019] Figure 4 This is the magnetic flux density distribution structure of phase A winding in Example 1;

[0020] Figure 5 This is the magnetic flux density distribution structure of phase A winding in a conventional motor winding;

[0021] Figure 6 This is a schematic diagram of the connection structure of phase A winding in Example 2;

[0022] Figure 7 This is a schematic diagram of the connection structure of phase B winding in Example 2;

[0023] Figure 8 This is a schematic diagram of the connection structure of the C-phase winding in Example 2. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, wherein each slot number is marked on the outside of the corresponding stator slot, and the upper layer of the stator slot is located on the inner ring, and the lower layer of the stator slot is located on the outer ring.

[0025] Example 1: A stator winding of a double-layer integer-slot permanent magnet motor includes multiple coils disposed in stator slots. The number of motor poles of the stator winding is defined as m, the number of stator slots as N, and the number of phases as k, where k = 3 and N / (mk) is an integer. The number of coils in each phase is c = 2N / (mk), and the c coils are divided into a first coil group and a second coil group. Each coil in the first coil group is defined as an initial coil and numbered sequentially. The difference in the starting slot number between two adjacent initial coils in the first coil group is 1. Each initial coil has a unique corresponding compensation coil in the second coil group. The compensation coil has the same serial number as the corresponding initial coil. The initial coil consists of (N / m-1) initial coils connected end-to-end. The connecting segments are arranged and numbered sequentially. The compensation coil consists of (N / m-1) interconnected compensation connecting segments, which are also numbered sequentially. The initial connecting segments with odd numbers occupy N / m slots (n1), and the initial connecting segments with even numbers occupy N / m+2 slots (n2). In the compensation coil corresponding to the initial coil, the starting slot number of each compensation connecting segment is the slot number of the initial connecting segment with the same number plus a difference α, where α = N / m. The compensation connecting segments with the same number occupy the same number of slots as the initial connecting segments. The starting slot number of the initial coil in the next phase is the starting slot number of the initial coil with the same number in the previous phase plus a difference β, where β = 2N / (mk).

[0026] A specific example is, for instance Figure 1 As shown, the motor has 4 poles, 24 stator slots, and 3 phases. The number of coils in each phase is 4. The stator winding is defined as including the A-phase winding, the B-phase winding, and the C-phase winding of the first type of stator. Each stator slot is numbered sequentially, and the p-th stator slot is denoted as slot p, where 1 ≤ p ≤ 24.

[0027] The A-phase winding of the first type of stator includes the first A-phase coil A1, the second A-phase coil A2, the third A-phase coil A3, and the fourth A-phase coil A4. The winding path of the first A-phase coil A1 is: upper layer of slot 1, lower layer of slot 6, upper layer of slot 13, and lower layer of slot 18. The winding path of the second A-phase coil A2 is: upper layer of slot 2, lower layer of slot 7, upper layer of slot 14, and lower layer of slot 19. The winding path of the third A-phase coil A3 is: upper layer of slot 7, lower layer of slot 12, upper layer of slot 19, and lower layer of slot 24. The winding path of the fourth A-phase coil A4 is: upper layer of slot 8, lower layer of slot 13, upper layer of slot 20, and lower layer of slot 1.

[0028] Here, we will only use the A-phase winding of the first type of stator to describe the winding structure of one phase in the entire stator winding. The rules for the structure of the other phases can be deduced from this.

[0029] The first coil A1 and the second coil A2 of phase A of the first type of stator form the first coil group in the phase A winding. The third coil A3 and the fourth coil A4 of phase A of the first type of stator form the second coil group in the phase A winding. The third coil A3 of phase A of the first type of stator is a compensation coil corresponding to the first coil A1 of phase A of the first type of stator, and the fourth coil A4 of phase A of the first type of stator is a compensation coil corresponding to the second coil A2 of phase A of the first type of stator. The first coil A1 of phase A of the stator consists of three initial connection segments connected end-to-end. The first initial connection segment is from the upper layer of slot 1 to the lower layer of slot 6; the second initial connection segment is from the lower layer of slot 6 to the upper layer of slot 13; and the third initial connection segment is from the upper layer of slot 13 to the lower layer of slot 18. The third coil A3 of phase A of the first type of stator consists of three compensation connection segments connected end-to-end. The first compensation connection segment is from the upper layer of slot 7 to the lower layer of slot 12; the second compensation connection segment is from the lower layer of slot 12 to the lower layer of slot 18. The upper layer of slot 9, and the third compensation connection section are from the upper layer of slot 19 to the lower layer of slot 24; among them, the number of slots n1 occupied by the initial connection section with odd number is N / m = 6, and the number of slots n2 occupied by the initial connection section with even number is N / m + 2 = 8; the starting slot number of each compensation connection section is the slot number of the initial connection section with the same number plus the difference α, α = N / m = 6, for example, the starting slot number "7" of the first compensation connection section is the slot number "1" of the first initial connection section plus the difference. 6. It is obtained that the starting slot number "12" of the second compensation connection segment is obtained by adding the difference 6 to the slot number "6" of the second initial connection segment; and the compensation connection segments with the same serial number occupy the same number of slots as the initial connection segments. For example, the number of slots occupied by the first compensation connection segment and the first initial connection segment is N / m = 6, the number of slots occupied by the second compensation connection segment and the second initial connection segment is N / m + 2 = 8, and the number of slots occupied by the third compensation connection segment and the third initial connection segment is N / m = 6.

[0030] The B-phase windings of the first type of stator include the first phase B-phase coil B1, the second phase B-phase coil B2, the third phase B-phase coil B3, and the fourth phase B-phase coil B4. The winding path of the first phase B-phase coil B1 is: upper layer of slot 5, lower layer of slot 10, upper layer of slot 17, lower layer of slot 22; the winding path of the second phase B-phase coil B2 is: upper layer of slot 6, lower layer of slot 11, upper layer of slot 18, lower layer of slot 23; the winding path of the third phase B-phase coil B3 is: upper layer of slot 11, lower layer of slot 16, lower layer of slot 23, lower layer of slot 24, lower layer of slot 25, lower layer of slot 26, lower layer of slot 27, lower layer of slot 28, lower layer of slot 29, lower layer of slot 20, lower layer of slot 21, lower layer of slot 22, lower layer of slot 23, lower layer of slot 24, lower layer of slot 25, lower layer of slot 26, lower layer of slot 27, lower layer of slot 28, lower layer of slot 29, lower layer of slot 21 ...1, lower layer of slot 21, lower layer of slot 21, lower layer of slot 21, lower layer of slot 21, lower layer of slot The upper layer of slot 3 and the lower layer of slot 4; the winding path of the fourth coil B4 of phase B of the first type of stator is: upper layer of slot 12, lower layer of slot 17, upper layer of slot 24, and lower layer of slot 5; here, the starting slot number of the initial coil in the phase B winding of the first type of stator is the starting slot number of the initial coil with the same serial number in the phase A winding of the first type of stator plus the difference β, β=2N / (mk)=4. For example, the starting slot number "5" of the first coil B1 of phase B of the first type of stator is obtained by adding the difference 4 to the starting slot number "1" of the first coil A1 of phase A of the first type of stator with the same serial number in the phase A winding of the first type of stator.

[0031] The C-phase windings of the first type of stator include the first C-phase coil C1, the second C-phase coil C2, the third C-phase coil C3, and the fourth C-phase coil C4. The winding path of the first C-phase coil C1 is: upper layer of slot 9, lower layer of slot 14, upper layer of slot 21, and lower layer of slot 2. The winding path of the second C-phase coil C2 is: upper layer of slot 10, lower layer of slot 15, upper layer of slot 22, and lower layer of slot 3. The winding path of the third C-phase coil C3 is: upper layer of slot 15, lower layer of slot 20, upper layer of slot 3, and lower layer of slot 8. The winding path of the fourth C-phase coil C4 is: upper layer of slot 16, lower layer of slot 21, upper layer of slot 4, and lower layer of slot 9.

[0032] The following uses the no-load back EMF deviation as an example to calculate the suppression effect of the stator winding on the winding eccentricity proposed in Example 1. The no-load back EMF of a three-phase synchronous motor is denoted as E, E = 4.44fNφ, where f is the power supply frequency, N is the number of turns, φ is the air gap flux, φ = ∫SB·dS, B is the air gap magnetic flux density, and S is the area through which the air gap flux passes. From this, it can be concluded that the no-load back EMF of a three-phase synchronous motor is proportional to the air gap magnetic flux density. Therefore, to determine the influence of motor eccentricity on the no-load back EMF, it is only necessary to calculate the air gap magnetic flux density.

[0033] Taking phase A winding as an example, such as Figure 2 The diagram shows the magnetic flux density distribution structure of phase A winding in the stator winding mentioned in Embodiment 1, which includes 4 magnetic flux density regions. Figure 3The diagram shows the magnetic flux density distribution structure of phase A winding in a conventional motor winding, which includes two magnetic flux density regions.

[0034] The following parameters are set to calculate the average magnetic flux density of each magnetic flux density region, and the remanence of the magnet is defined as B. r B r = 1.2672T, define the thickness of the magnet as L M L M =4mm, define the air gap length as L air L air =0.9mm, define the eccentricity as x, x = 0.1mm, define the observation angle as θ, then the average magnetic flux density B of the first magnetic flux density region new1 in Example 1 is... new1 (x) is:

[0035]

[0036] The average magnetic flux density B of the second magnetic flux density region new2 in Example 1 new2 (x) is:

[0037]

[0038] The average magnetic flux density B of the third magnetic flux density region new3 in Example 1 new3 (x) is:

[0039]

[0040] The average magnetic flux density B of the fourth magnetic flux density region new4 in Example 1 new4 (x) is:

[0041]

[0042] The average magnetic flux density B of the two magnetic flux density regions new1 and new3 N1 (x) is:

[0043]

[0044] The average magnetic flux density B of the two magnetic flux density regions new2 and new4 N2 (x) is:

[0045]

[0046] The average magnetic flux density B of the first magnetic flux density region old1 of a conventional motor winding old1 (0.1) is:

[0047]

[0048] The average magnetic flux density B of the second magnetic flux density region old2 of a conventional motor winding old2 (0.1) is:

[0049]

[0050] Let B(0) be the average magnetic flux density without eccentricity, where B(0) = 1.034T. Then, in Example 1, the unbalance Δ of the magnetic flux density of phase A winding is... new for: The magnetic flux density imbalance Δ of phase A winding in a conventional motor winding old for:

[0051] This proves that the stator winding connection method proposed in Embodiment 1 can effectively reduce the imbalance of magnetic flux density caused by eccentricity, that is, it can effectively reduce the imbalance of no-load back EMF.

[0052] Example 2: The rest is the same as Example 1, except that the number of motor poles m = 4, the number of stator slots N = 48, the number of phases k = 3, and the number of coils in each phase c = 8. In this case, the stator winding is defined as including the A phase winding of the second type of stator, the B phase winding of the second type of stator, and the C phase winding of the second type of stator. Each stator slot is numbered in sequence, and the qth stator slot is recorded as slot number q, 1≤q≤48;

[0053] The A-phase windings of the second-type stator include the first A-phase coil a1, the second A-phase coil a2, the third A-phase coil a3, the fourth A-phase coil a4, the fifth A-phase coil a5, the sixth A-phase coil a6, the seventh A-phase coil a7, and the eighth A-phase coil a8. The winding path of the first A-phase coil a1 is: upper layer of slot 1, lower layer of slot 12, upper layer of slot 25, and lower layer of slot 36; the winding path of the second A-phase coil a2 is: upper layer of slot 2, lower layer of slot 13, upper layer of slot 26, and lower layer of slot 37; the winding path of the third A-phase coil a3 is: upper layer of slot 3, lower layer of slot 14, upper layer of slot 15, lower layer of slot 16, upper layer of slot 17, and lower layer of slot 37; the winding path of the third A-phase coil a3 is: upper layer of slot 3, upper layer of slot 14, lower layer of slot 15, upper layer of slot 16, lower layer of slot 17, upper layer of slot 18, lower layer of slot 19, upper layer of slot 10, lower layer of slot 11, lower layer of slot 12, upper layer of slot 25, and lower layer of slot 36. The winding path of the fourth coil a4 of phase A in the second type of stator is: upper layer of slot 4, lower layer of slot 15, upper layer of slot 28, lower layer of slot 39; the winding path of the fifth coil a5 of phase A in the second type of stator is: upper layer of slot 13, lower layer of slot 24, upper layer of slot 37, lower layer of slot 48; the winding path of the sixth coil a6 of phase A in the second type of stator is: upper layer of slot 14, lower layer of slot 25, upper layer of slot 38, lower layer of slot 1; the winding path of the seventh coil a7 of phase A in the second type of stator is: upper layer of slot 15, lower layer of slot 26, upper layer of slot 39, lower layer of slot 2; the winding path of the eighth coil a8 of phase A in the second type of stator is: upper layer of slot 16, lower layer of slot 27, upper layer of slot 40, lower layer of slot 3.

[0054] The B-phase windings of the second-type stator include the first B-phase coil b1, the second B-phase coil b2, the third B-phase coil b3, the fourth B-phase coil b4, the fifth B-phase coil b5, the sixth B-phase coil b6, the seventh B-phase coil b7, and the eighth B-phase coil b8. The winding path of the first B-phase coil b1 is: upper layer of slot 9, lower layer of slot 20, upper layer of slot 33, and lower layer of slot 44; the winding path of the second B-phase coil b2 is: upper layer of slot 10, lower layer of slot 21, upper layer of slot 34, and lower layer of slot 45; the winding path of the third B-phase coil b3 is: upper layer of slot 11, lower layer of slot 22, upper layer of slot 23, upper layer of slot 34, and lower layer of slot 45; the winding path of the third B-phase coil b3 is: upper layer of slot 11, upper layer of slot 22, upper layer of slot 34, and lower layer of slot 45. The winding path of the fourth coil b4 of phase B in the second type of stator is: upper layer of slot 12, lower layer of slot 23, upper layer of slot 36, lower layer of slot 47; the winding path of the fifth coil b5 of phase B in the second type of stator is: upper layer of slot 21, lower layer of slot 32, upper layer of slot 45, lower layer of slot 8; the winding path of the sixth coil b6 of phase B in the second type of stator is: upper layer of slot 22, lower layer of slot 33, upper layer of slot 46, lower layer of slot 9; the winding path of the seventh coil b7 of phase B in the second type of stator is: upper layer of slot 23, lower layer of slot 34, upper layer of slot 47, lower layer of slot 10; the winding path of the eighth coil b8 of phase B in the second type of stator is: upper layer of slot 24, lower layer of slot 35, upper layer of slot 48, lower layer of slot 11.

[0055] The C-phase windings of the second-type stator include the first C-phase coil c1, the second C-phase coil c2, the third C-phase coil c3, the fourth C-phase coil c4, the fifth C-phase coil c5, the sixth C-phase coil c6, the seventh C-phase coil c7, and the eighth C-phase coil c8. The winding path of the first C-phase coil c1 is: upper layer of slot 17, lower layer of slot 28, upper layer of slot 41, lower layer of slot 4; the winding path of the second C-phase coil c2 is: upper layer of slot 18, lower layer of slot 29, upper layer of slot 42, lower layer of slot 5; the winding path of the third C-phase coil c3 is: upper layer of slot 19, lower layer of slot 30, upper layer of slot 41, lower layer of slot 5, upper layer of slot 18, lower layer of slot 29, upper layer of slot 42, lower layer of slot 5; the winding path of the third C-phase coil c3 is: upper layer of slot 19, upper layer of slot 30, lower layer of slot 41, upper layer of slot 5 ...61, upper layer of slot 41, lower layer of slot 5, upper layer of slot 61, upper layer of slot 71, lower layer of slot 81, upper layer of slot 91, lower layer of slot 10, lower layer of slot 11, lower layer of slot 12, upper layer of slot 13, lower layer of slot 14, lower layer of slot 15, upper layer of slot 16, lower layer of slot 17, lower layer of The winding path of the fourth coil c4 of phase C in the second type of stator is: upper layer of slot 20, lower layer of slot 31, upper layer of slot 44, lower layer of slot 7; the winding path of the fifth coil c5 of phase C in the second type of stator is: upper layer of slot 29, lower layer of slot 40, upper layer of slot 5, lower layer of slot 16; the winding path of the sixth coil c6 of phase C in the second type of stator is: upper layer of slot 30, lower layer of slot 41, upper layer of slot 6, lower layer of slot 17; the winding path of the seventh coil c7 of phase C in the second type of stator is: upper layer of slot 31, lower layer of slot 42, upper layer of slot 7, lower layer of slot 18; the winding path of the eighth coil c8 of phase C in the second type of stator is: upper layer of slot 32, lower layer of slot 43, upper layer of slot 8, lower layer of slot 19.

[0056] Similar to Embodiment 1 and Embodiment 2, the stator winding structure set according to the same rules is also applicable to 36-slot 6-pole three-phase motors and 72-slot 12-pole three-phase motors.

Claims

1. A stator winding of a double-layer integer-slot permanent magnet motor, comprising multiple coils disposed in stator slots, wherein the number of motor poles of the stator winding is defined as m, the number of stator slots as N, and the number of phases as k, k = 3, and N / (mk) is an integer, characterized in that, The number of coils in each phase is c = 2N / (mk), and the c coils are divided into a first coil group and a second coil group. Each coil in the first coil group is defined as an initial coil and numbered sequentially. The difference between the starting slot numbers of two adjacent initial coils in the first coil group is 1. Each initial coil has a unique corresponding compensation coil in the second coil group. The compensation coil has the same serial number as the corresponding initial coil. The initial coil consists of (N / m-1) initial connecting segments connected end to end and numbered sequentially. The compensation coil consists of (N / m-1) compensation connecting segments connected end to end and numbered sequentially. The initial connecting segments with odd serial numbers occupy N / m slots n1, and the initial connecting segments with even serial numbers occupy N / m+2 slots n2. In the compensation coil corresponding to the initial coil, the starting slot number of each compensation connection segment is the slot number of the initial connection segment with the same sequence number plus the difference α, where α = N / m, and the number of slots occupied by the compensation connection segment with the same sequence number is the same as that of the initial connection segment. The starting slot number of the initial coil in the next phase is the starting slot number of the initial coil with the same sequence number in the previous phase plus the difference β, where β = 2N / (mk).

2. The stator winding of a double-layer integer slot permanent magnet motor according to claim 1, characterized in that... The stator winding has 4 motor poles m, 24 stator slots N, 3 phases k, and 4 coils in each phase. The stator winding is defined as including the A-phase winding, B-phase winding and C-phase winding of the first type of stator. Each stator slot is numbered sequentially, and the p-th stator slot is denoted as slot p, where 1 ≤ p ≤ 24. The A-phase winding of the first type of stator includes a first A-phase coil, a second A-phase coil, a third A-phase coil, and a fourth A-phase coil. The winding path of the first A-phase coil is: upper layer of slot 1, lower layer of slot 6, upper layer of slot 13, and lower layer of slot 18; the winding path of the second A-phase coil is: upper layer of slot 2, lower layer of slot 7, upper layer of slot 14, and lower layer of slot 19; the winding path of the third A-phase coil is: upper layer of slot 7, lower layer of slot 12, upper layer of slot 19, and lower layer of slot 24; and the winding path of the fourth A-phase coil is: upper layer of slot 8, lower layer of slot 13, upper layer of slot 20, and lower layer of slot 1. The B-phase winding of the first type of stator includes a first B-phase coil, a second B-phase coil, a third B-phase coil, and a fourth B-phase coil. The winding path of the first B-phase coil is: upper layer of slot 5, lower layer of slot 10, upper layer of slot 17, and lower layer of slot 22; the winding path of the second B-phase coil is: upper layer of slot 6, lower layer of slot 11, upper layer of slot 18, and lower layer of slot 23; the winding path of the third B-phase coil is: upper layer of slot 11, lower layer of slot 16, upper layer of slot 23, and lower layer of slot 4; the winding path of the fourth B-phase coil is: upper layer of slot 12, lower layer of slot 17, upper layer of slot 24, and lower layer of slot 5. The first type of stator's C-phase winding includes a first C-phase coil, a second C-phase coil, a third C-phase coil, and a fourth C-phase coil. The winding path of the first C-phase coil is: upper layer of slot 9, lower layer of slot 14, upper layer of slot 21, and lower layer of slot 2. The winding path of the second C-phase coil is: upper layer of slot 10, lower layer of slot 15, upper layer of slot 22, and lower layer of slot 3. The winding path of the third C-phase coil is: upper layer of slot 15, lower layer of slot 20, upper layer of slot 3, and lower layer of slot 8. The winding path of the fourth C-phase coil is: upper layer of slot 16, lower layer of slot 21, upper layer of slot 4, and lower layer of slot 9.

3. The stator winding of a double-layer integer slot permanent magnet motor according to claim 1, characterized in that... The stator winding has 4 motor poles m, 48 stator slots N, 3 phases k, and 8 coils in each phase. The stator winding is defined as including the A-phase winding of the second type of stator, the B-phase winding of the second type of stator, and the C-phase winding of the second type of stator. Each stator slot is numbered sequentially, and the q-th stator slot is denoted as slot q, where 1 ≤ q ≤ 48. The second-type stator's A-phase winding includes the second-type stator's A-phase first coil, second coil, third coil, fourth coil, fifth coil, sixth coil, seventh coil, and eighth coil. The winding path of the second-type stator's A-phase first coil is: upper layer of slot 1, lower layer of slot 12, upper layer of slot 25, and lower layer of slot 36. The winding path of the second-type stator's A-phase second coil is: upper layer of slot 2, lower layer of slot 13, upper layer of slot 26, and lower layer of slot 37. The winding path of the second-type stator's A-phase third coil is: upper layer of slot 3, lower layer of slot 14, and lower layer of slot 27. The winding path of the fourth coil of phase A in the second type of stator is: upper layer of slot 4, lower layer of slot 15, upper layer of slot 28, lower layer of slot 39; the winding path of the fifth coil of phase A in the second type of stator is: upper layer of slot 13, lower layer of slot 24, upper layer of slot 37, lower layer of slot 48; the winding path of the sixth coil of phase A in the second type of stator is: upper layer of slot 14, lower layer of slot 25, upper layer of slot 38, lower layer of slot 1; the winding path of the seventh coil of phase A in the second type of stator is: upper layer of slot 15, lower layer of slot 26, upper layer of slot 39, lower layer of slot 2; the winding path of the eighth coil of phase A in the second type of stator is: upper layer of slot 16, lower layer of slot 27, upper layer of slot 40, lower layer of slot 3. The B-phase winding of the second type of stator includes the first, second, third, fourth, fifth, sixth, and seventh B-phase coils of the second type of stator, and the eighth B-phase coil of the second type of stator. The winding path of the first B-phase coil of the second type of stator is: upper layer of slot 9, lower layer of slot 20, upper layer of slot 33, and lower layer of slot 44; the winding path of the second B-phase coil of the second type of stator is: upper layer of slot 10, lower layer of slot 21, upper layer of slot 34, and lower layer of slot 45; the winding path of the third B-phase coil of the second type of stator is: upper layer of slot 11, lower layer of slot 22, and lower layer of slot 35. The winding path of the fourth coil of phase B in the second type of stator is: upper layer of slot 12, lower layer of slot 23, upper layer of slot 36, lower layer of slot 47; the winding path of the fifth coil of phase B in the second type of stator is: upper layer of slot 21, lower layer of slot 32, upper layer of slot 45, lower layer of slot 8; the winding path of the sixth coil of phase B in the second type of stator is: upper layer of slot 22, lower layer of slot 33, upper layer of slot 46, lower layer of slot 9; the winding path of the seventh coil of phase B in the second type of stator is: upper layer of slot 23, lower layer of slot 34, upper layer of slot 47, lower layer of slot 10; the winding path of the eighth coil of phase B in the second type of stator is: upper layer of slot 24, lower layer of slot 35, upper layer of slot 48, lower layer of slot 11. The C-phase winding of the second type of stator includes the first, second, third, fourth, fifth, sixth, and seventh C-phase coils of the second type of stator, and the eighth C-phase coil of the second type of stator. The winding path of the first C-phase coil is: upper layer of slot 17, lower layer of slot 28, upper layer of slot 41, and lower layer of slot 4; the winding path of the second C-phase coil is: upper layer of slot 18, lower layer of slot 29, upper layer of slot 42, and lower layer of slot 5; the winding path of the third C-phase coil is: upper layer of slot 19, lower layer of slot 30, and lower layer of slot 43. The winding path of the fourth coil of phase C in the second type of stator is: upper layer of slot 20, lower layer of slot 31, upper layer of slot 44, lower layer of slot 7; the winding path of the fifth coil of phase C in the second type of stator is: upper layer of slot 29, lower layer of slot 40, upper layer of slot 5, lower layer of slot 16; the winding path of the sixth coil of phase C in the second type of stator is: upper layer of slot 30, lower layer of slot 41, upper layer of slot 6, lower layer of slot 17; the winding path of the seventh coil of phase C in the second type of stator is: upper layer of slot 31, lower layer of slot 42, upper layer of slot 7, lower layer of slot 18; the winding path of the eighth coil of phase C in the second type of stator is: upper layer of slot 32, lower layer of slot 43, upper layer of slot 8, lower layer of slot 19.

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