Stator winding of double-layer integer slot permanent magnet motor

Abstract

The invention discloses a stator winding of a double-layer integer slot permanent magnet motor, which comprises a plurality of coils arranged in stator slots, the number of motor poles of the stator winding is defined as m, the number of the stator slots is defined as N, the number of phases is defined as k, k is equal to 3, and N / (mk) is an integer, and is characterized in that the number c of the coils in each phase is equal to 2N / (mk), the coils in the same phase are equally divided into a first coil group and a 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 through mutual cooperation of the initial connection section and the corresponding compensation connection section. The stator winding structure has the advantages that four uniform flux density areas are formed in the whole circumferential range by changing the coil connection mode of a single branch in the stator winding of the original motor, and if the motor rotor is eccentric, the winding connection mode can effectively counteract the influence of rotor eccentricity when current is introduced.

Description

Technical Field

[0001] The invention relates to a stator winding structure, in particular to a stator winding of a double-layer integer-slot permanent magnet motor. Background Art

[0002] Permanent magnet motors (PMMs) have been widely used in high-performance rotating motors for industrial, medical, aerospace, and other fields in recent years. However, due to limitations in installation processes, it's impossible to completely align the stator center with the rotor center, resulting in rotor eccentricity. Existing solutions to the problems of no-load back EMF variation, reduced power factor, and increased vibration and noise caused by PMM rotor eccentricity primarily rely on control strategies, such as harmonic current injection and dynamic slip vector control, which require significant investment from manufacturers. Other solutions involve adding a set of control windings 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 minor structural changes and low cost. If the motor rotor is eccentric, the influence of the rotor eccentricity can be offset when current is passed through.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a stator winding of a double-layer integer slot permanent magnet motor, including a plurality of coils arranged in the stator slots, defining the number of motor poles of the stator winding as m, the number of stator slots as N, the number of phases as k, k=3, and N / (mk) is an integer, the number of coils in each phase 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 in sequence, and the adjacent two initial coils in the first coil group are The difference in starting slot numbers is 1. Each of the initial coils 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 is composed of (N / m-1) initial connection segments connected end to end and numbered in sequence. The compensation coil is composed of (N / m-1) compensation connection segments connected end to end and numbered in sequence. The number n1 of slots occupied by the odd-numbered initial connection segments is N / m, and the number n2 of slots occupied by the even-numbered initial connection segments is N / m+2.

[0005] 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 serial number plus the difference α, α=N / m, and the number of slots occupied by the compensation connecting segment with the same serial number is the same as that of the initial connecting 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 serial number in the previous phase plus a difference β, β=2N / (mk).

[0007] Compared with the prior art, the present invention has the advantage of simply changing the coil connection method of a single branch in the original motor's stator winding, 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. Ultimately, through the mutual cooperation of the initial connection section and the corresponding compensation connection section, four uniform magnetic flux density areas are formed throughout the entire circumference. If the motor rotor is eccentric, when current is passed, this winding connection method can effectively offset the effect of rotor eccentricity. Calculation and comparison of the A-phase winding showed that the magnetic flux imbalance of the A-phase winding in the present invention was only 0.67%, while the magnetic flux imbalance of the A-phase winding in the conventional motor winding was 2.61%. This proves that the stator winding connection method of the present invention can effectively reduce the magnetic flux imbalance caused by eccentricity, that is, it can effectively reduce the unbalance of the no-load back electromotive force. In addition, the arrangement of the initial connection section and the compensation connection section can ensure that the connection length of each coil is sufficient while ensuring that the overall magnetic flux density has a relatively good balance.

[0008] Specifically, the stator winding has a motor pole number m=4, a stator slot number N=24, a phase number k=3, and a coil number c=4 in each phase. The stator winding is defined as comprising a first-type stator A-phase winding, a first-type stator B-phase winding, and a first-type stator C-phase winding. Each stator slot is numbered sequentially, and the p-th stator slot is designated as slot number p, where 1≤p≤24.

[0009] The A-phase winding of the first type of stator includes an A-phase first coil of the first type of stator, an A-phase second coil of the first type of stator, an A-phase third coil of the first type of stator and an A-phase fourth coil of the first type of stator. The winding path of the A-phase first coil of the first type of stator 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 A-phase second coil of the first type of stator 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 A-phase third coil of the first type of stator 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 A-phase fourth coil of the first type of stator 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 B-phase first coil of the first type of stator, a B-phase second coil of the first type of stator, a B-phase third coil of the first type of stator and a B-phase fourth coil of the first type of stator. The winding path of the B-phase first coil of the first type of stator is: upper layer of slot No. 5, lower layer of slot No. 10, upper layer of slot No. 17, lower layer of slot No. 22; the winding path of the B-phase second coil of the first type of stator is: upper layer of slot No. 6, lower layer of slot No. 11, upper layer of slot No. 18, lower layer of slot No. 23; the winding path of the B-phase third coil of the first type of stator is: upper layer of slot No. 11, lower layer of slot No. 16, upper layer of slot No. 23, lower layer of slot No. 4; the winding path of the B-phase fourth coil of the first type of stator is: upper layer of slot No. 12, lower layer of slot No. 17, upper layer of slot No. 24, lower layer of slot No. 5;

[0011] The C-phase winding of the first type of stator includes a C-phase first coil of the first type of stator, a C-phase second coil of the first type of stator, a C-phase third coil of the first type of stator and a C-phase fourth coil of the first type of stator. The winding path of the C-phase first coil of the first type of stator is: upper layer of slot No. 9, lower layer of slot No. 14, upper layer of slot No. 21, lower layer of slot No. 2; the winding path of the C-phase second coil of the first type of stator is: upper layer of slot No. 10, lower layer of slot No. 15, upper layer of slot No. 22, lower layer of slot No. 3; the winding path of the C-phase third coil of the first type of stator is: upper layer of slot No. 15, lower layer of slot No. 20, upper layer of slot No. 3, lower layer of slot No. 8; the winding path of the C-phase fourth coil of the first type of stator is: upper layer of slot No. 16, lower layer of slot No. 21, upper layer of slot No. 4, lower layer of slot No. 9.

[0012] Another specific structure of the stator winding is as follows: the number of motor poles m of the stator winding is 4, the number of stator slots N is 48, the number of phases k is 3, and the number of coils in each phase is c is 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, where 1≤q≤48;

[0013] The A-phase winding of the second type of stator includes the A-phase first coil of the second type of stator, the A-phase second coil of the second type of stator, the A-phase third coil of the second type of stator, the A-phase fourth coil of the second type of stator, the A-phase fifth coil of the second type of stator, the A-phase sixth coil of the second type of stator, the A-phase seventh coil of the second type of stator and the A-phase eighth coil of the second type of stator. The winding path of the A-phase first coil of the second type of stator is: upper layer of slot No. 1, lower layer of slot No. 12, upper layer of slot No. 25, lower layer of slot No. 36; the winding path of the A-phase second coil of the second type of stator is: upper layer of slot No. 2, lower layer of slot No. 13, upper layer of slot No. 26, lower layer of slot No. 37; the winding path of the A-phase third coil of the second type of stator is: upper layer of slot No. 3, lower layer of slot No. 14, lower layer of slot No. 27 The winding path of the fourth coil of the A phase of the second type of stator is: the upper layer of slot No. 4, the lower layer of slot No. 15, the upper layer of slot No. 28, and the lower layer of slot No. 39; the winding path of the fifth coil of the A phase of the second type of stator is: the upper layer of slot No. 13, the lower layer of slot No. 24, the upper layer of slot No. 37, and the lower layer of slot No. 48; the winding path of the sixth coil of the A phase of the second type of stator is: the upper layer of slot No. 14, the lower layer of slot No. 25, the upper layer of slot No. 38, and the lower layer of slot No. 1; the winding path of the seventh coil of the A phase of the second type of stator is: the upper layer of slot No. 15, the lower layer of slot No. 26, the upper layer of slot No. 39, and the lower layer of slot No. 2; the winding path of the eighth coil of the A phase of the second type of stator is: the upper layer of slot No. 16, the lower layer of slot No. 27, the upper layer of slot No. 40, and the lower layer of slot No. 3;

[0014] The B-phase winding of the second type of stator includes a B-phase first coil of the second type of stator, a B-phase second coil of the second type of stator, a B-phase third coil of the second type of stator, a B-phase fourth coil of the second type of stator, a B-phase fifth coil of the second type of stator, a B-phase sixth coil of the second type of stator, a B-phase seventh coil of the second type of stator and a B-phase eighth coil of the second type of stator. The winding path of the B-phase first coil of the second type of stator is: upper layer of slot No. 9, lower layer of slot No. 20, upper layer of slot No. 33, lower layer of slot No. 44; the winding path of the B-phase second coil of the second type of stator is: upper layer of slot No. 10, lower layer of slot No. 21, upper layer of slot No. 34, lower layer of slot No. 45; the winding path of the B-phase third coil of the second type of stator is: upper layer of slot No. 11, lower layer of slot No. 22, lower layer of slot No. 35 The winding path of the fourth coil of the B phase of the second type of stator is: the upper layer of slot No. 12, the lower layer of slot No. 23, the upper layer of slot No. 36, and the lower layer of slot No. 47; the winding path of the fifth coil of the B phase of the second type of stator is: the upper layer of slot No. 21, the lower layer of slot No. 32, the upper layer of slot No. 45, and the lower layer of slot No. 8; the winding path of the sixth coil of the B phase of the second type of stator is: the upper layer of slot No. 22, the lower layer of slot No. 33, the upper layer of slot No. 46, and the lower layer of slot No. 9; the winding path of the seventh coil of the B phase of the second type of stator is: the upper layer of slot No. 23, the lower layer of slot No. 34, the upper layer of slot No. 47, and the lower layer of slot No. 10; the winding path of the eighth coil of the B phase of the second type of stator is: the upper layer of slot No. 24, the lower layer of slot No. 35, the upper layer of slot No. 48, and the lower layer of slot No. 11;

[0015] The C-phase winding of the second type of stator includes a C-phase first coil of the second type of stator, a C-phase second coil of the second type of stator, a C-phase third coil of the second type of stator, a C-phase fourth coil of the second type of stator, a C-phase fifth coil of the second type of stator, a C-phase sixth coil of the second type of stator, a C-phase seventh coil of the second type of stator and a C-phase eighth coil of the second type of stator. The winding path of the C-phase first coil of the second type of stator is: upper layer of slot No. 17, lower layer of slot No. 28, upper layer of slot No. 41, lower layer of slot No. 4; the winding path of the C-phase second coil of the second type of stator is: upper layer of slot No. 18, lower layer of slot No. 29, upper layer of slot No. 42, lower layer of slot No. 5; the winding path of the C-phase third coil of the second type of stator is: upper layer of slot No. 19, lower layer of slot No. 30, lower layer of slot No. 43 The upper layer of slot No. 1 and the lower layer of slot No. 6; the winding path of the C-phase fourth coil of the second type stator is: the upper layer of slot No. 20, the lower layer of slot No. 31, the upper layer of slot No. 44, and the lower layer of slot No. 7; the winding path of the C-phase fifth coil of the second type stator is: the upper layer of slot No. 29, the lower layer of slot No. 40, the upper layer of slot No. 5, and the lower layer of slot No. 16; the winding path of the C-phase sixth coil of the second type stator is: the upper layer of slot No. 30, the lower layer of slot No. 41, the upper layer of slot No. 6, and the lower layer of slot No. 17; the winding path of the C-phase seventh coil of the second type stator is: the upper layer of slot No. 31, the lower layer of slot No. 42, the upper layer of slot No. 7, and the lower layer of slot No. 18; the winding path of the C-phase eighth coil of the second type stator is: the upper layer of slot No. 32, the lower layer of slot No. 43, the upper layer of slot No. 8, and the lower layer of slot No. 19. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the connection structure of the A-phase winding in Example 1;

[0017] Figure 2 Schematic diagram of the connection structure of the B-phase winding in Example 1;

[0018] Figure 3 Schematic diagram of the connection structure of the C-phase winding in Example 1;

[0019] Figure 4 The magnetic flux distribution structure of the A-phase winding in Example 1;

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

[0021] Figure 6 Schematic diagram of the connection structure of the A-phase winding in Example 2;

[0022] Figure 7 Schematic diagram of the connection structure of the B-phase winding in Example 2;

[0023] Figure 8 Schematic diagram of the connection structure of the C-phase winding in Example 2. DETAILED DESCRIPTION

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

[0025] Embodiment 1: A stator winding of a double-layer integer slot permanent magnet motor includes a plurality of coils arranged in stator slots, wherein the number of motor poles of the stator winding is defined as m, the number of stator slots is N, the number of phases is 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 in sequence, 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, and the initial coil is composed of (N / m-1) initial coils connected end to end The compensation coil is composed of (N / m-1) compensation connection segments connected end to end and numbered in sequence, wherein the number of slots n1 occupied by the initial connection segments with odd numbers is N / m, and the number of slots n2 occupied by the initial connection segments with even numbers is N / m+2; 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 serial number plus the difference α, α=N / m, and the number of slots occupied by the compensation connection segment with the same serial number is the same as that of the initial connection segment; the starting slot number of the initial coil located in the next phase is the starting slot number of the initial coil with the same serial number located in the previous phase plus the difference β, β=2N / (mk).

[0026] A specific example is, Figure 1 As shown, the number of motor poles of the stator winding is m=4, the number of stator slots is N=24, the number of phases is k=3, and the number of coils in each phase is c=4. In this case, the stator winding is defined as including the A-phase winding of the first type of stator, the B-phase winding of the first type of stator, and the C-phase winding of the first type of stator. Each stator slot is numbered in sequence, and the p-th stator slot is recorded as slot number p, 1≤p≤24;

[0027] The A-phase winding of the first type of stator includes the A-phase first coil A1 of the first type of stator, the A-phase second coil A2 of the first type of stator, the A-phase third coil A3 of the first type of stator and the A-phase fourth coil A4 of the first type of stator. The winding path of the A-phase first coil A1 of the first type of stator is: upper layer of slot No. 1, lower layer of slot No. 6, upper layer of slot No. 13, lower layer of slot No. 18; the winding path of the A-phase second coil A2 of the first type of stator is: upper layer of slot No. 2, lower layer of slot No. 7, upper layer of slot No. 14, lower layer of slot No. 19; the winding path of the A-phase third coil A3 of the first type of stator is: upper layer of slot No. 7, lower layer of slot No. 12, upper layer of slot No. 19, lower layer of slot No. 24; the winding path of the A-phase fourth coil A4 of the first type of stator is: upper layer of slot No. 8, lower layer of slot No. 13, upper layer of slot No. 20, lower layer of slot No. 1.

[0028] Here, only the A-phase winding of the first type of stator is used to illustrate the winding structure of one phase in the entire stator winding, and the structural composition rules of the remaining phases can be inferred from this.

[0029] The A-phase first coil A1 of the first type stator and the A-phase second coil A2 of the first type stator constitute the first coil group in the A-phase winding, the A-phase third coil A3 of the first type stator and the A-phase fourth coil A4 of the first type stator constitute the second coil group in the A-phase winding, the A-phase third coil A3 of the first type stator is the compensation coil corresponding to the A-phase first coil A1 of the first type stator, and the A-phase fourth coil A4 of the first type stator is the compensation coil corresponding to the A-phase second coil A2 of the first type stator; the first type stator The first coil A1 of the A phase of the stator is composed of three initial connection sections connected end to end. The first initial connection section is: the upper layer of slot 1 to the lower layer of slot 6, the second initial connection section is: the lower layer of slot 6 to the upper layer of slot 13, and the third initial connection section is: the upper layer of slot 13 to the lower layer of slot 18; the third coil A3 of the A phase of the first type of stator is composed of three compensation connection sections connected end to end. The first compensation connection section is: the upper layer of slot 7 to the lower layer of slot 12, and the second compensation connection section is: the lower layer of slot 12 to 1 The upper layer of slot 9, the third compensating connecting section is: the upper layer of slot 19 to the lower layer of slot 24; among them, the number of slots n1 occupied by the initial connecting sections with odd numbers is N / m=6, and the number of slots n2 occupied by the initial connecting sections with even numbers is N / m+2=8; the starting slot number of each compensating connecting section is the slot number of the initial connecting section with the same number plus the difference α, α=N / m=6, for example, the starting slot number "7" of the first compensating connecting section is the slot number "1" of the first initial connecting section plus the difference 6, the starting slot number "12" of the No. 2 compensating connection segment is obtained by adding the difference 6 to the slot number "6" of the No. 2 initial connection segment; and the compensating connection segments and the initial connection segments with the same serial number occupy the same number of slots, such as the No. 1 compensating connection segment and the No. 1 initial connection segment both occupy N / m=6, the No. 2 compensating connection segment and the No. 2 initial connection segment both occupy N / m+2=8, and the No. 3 compensating connection segment and the No. 3 initial connection segment both occupy N / m=6.

[0030] The B-phase winding of the first type of stator includes the B-phase first coil B1 of the first type of stator, the B-phase second coil B2 of the first type of stator, the B-phase third coil B3 of the first type of stator and the B-phase fourth coil B4 of the first type of stator. The winding path of the B-phase first coil B1 of the first type of stator is: the upper layer of slot 5, the lower layer of slot 10, the upper layer of slot 17, and the lower layer of slot 22; the winding path of the B-phase second coil B2 of the first type of stator is: the upper layer of slot 6, the lower layer of slot 11, the upper layer of slot 18, and the lower layer of slot 23; the winding path of the B-phase third coil B3 of the first type of stator is: the upper layer of slot 11, the lower layer of slot 16, and the lower layer of slot 2 The upper layer of slot 3 and the lower layer of slot 4; the winding path of the fourth coil B4 of the B phase of the first type stator is: the upper layer of slot 12, the lower layer of slot 17, the upper layer of slot 24, and the lower layer of slot 5; here, the starting slot number of the initial coil in the B phase winding of the first type stator is the starting slot number of the initial coil with the same serial number in the A phase winding of the first type stator plus the difference β, β=2N / (mk)=4, such as the starting slot number "5" of the first coil B1 of the B phase of the first type stator is the starting slot number "1" of the first coil A1 of the A phase of the first type stator with the same serial number in the A phase winding of the first type stator plus the difference 4.

[0031] The C-phase winding of the first type of stator includes a C-phase first coil C1 of the first type of stator, a C-phase second coil C2 of the first type of stator, a C-phase third coil C3 of the first type of stator and a C-phase fourth coil C4 of the first type of stator. The winding path of the C-phase first coil C1 of the first type of stator is: upper layer of slot No. 9, lower layer of slot No. 14, upper layer of slot No. 21, lower layer of slot No. 2; the winding path of the C-phase second coil C2 of the first type of stator is: upper layer of slot No. 10, lower layer of slot No. 15, upper layer of slot No. 22, lower layer of slot No. 3; the winding path of the C-phase third coil C3 of the first type of stator is: upper layer of slot No. 15, lower layer of slot No. 20, upper layer of slot No. 3, lower layer of slot No. 8; the winding path of the C-phase fourth coil C4 of the first type of stator is: upper layer of slot No. 16, lower layer of slot No. 21, upper layer of slot No. 4, lower layer of slot No. 9.

[0032] The following uses the no-load back EMF deviation as an example to calculate the effectiveness of the stator winding in suppressing the effects of winding eccentricity, as proposed in Example 1. The no-load back EMF of a three-phase synchronous motor is denoted as E, where E = 4.44fNφ, where f is the power frequency, N is the number of turns, φ is the air gap flux, and φ = ∫SB·dS, where B is the air gap flux density, and S is the area through which the air gap flux passes. This indicates that the no-load back EMF of a three-phase synchronous motor is proportional to the air gap flux density. Therefore, to determine the effect of motor eccentricity on the no-load back EMF, one only needs to calculate the air gap flux density.

[0033] Take the A-phase winding as an example, Figure 2 The figure shows the magnetic flux distribution structure of the A-phase winding in the stator winding mentioned in the first embodiment, including four magnetic flux areas; Figure 3The figure shows the magnetic flux distribution structure of the A-phase winding in a conventional motor winding, which includes two magnetic flux areas.

[0034] Set the following parameters to calculate the average magnetic flux density of each magnetic flux density area, and define the remanence of the magnetic steel as B r , B r =1.2672T, define the magnetic steel thickness 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 density B of the first magnetic density area new1 in Example 1 is new1 (x) is:

[0035]

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

[0037]

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

[0039]

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

[0041]

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

[0043]

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

[0045]

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

[0047]

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

[0049]

[0050] The average value of the magnetic flux density when there is no eccentricity is defined as B(0), B(0) = 1.034T, then the unbalanced degree of the magnetic flux density of the A-phase winding in the first embodiment is Δ new for: The magnetic flux imbalance Δ of the A-phase winding in a conventional motor winding old for:

[0051] This proves that the stator winding connection method proposed in Example 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 electromotive force.

[0052] Example 2: The rest is the same as Example 1, except that the number of motor poles m of the stator winding is 4, the number of stator slots N is 48, the number of phases k is 3, and the number of coils in each phase is 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, where 1≤q≤48;

[0053] The A-phase winding of the second type of stator includes the A-phase first coil a1 of the second type of stator, the A-phase second coil a2 of the second type of stator, the A-phase third coil a3 of the second type of stator, the A-phase fourth coil a4 of the second type of stator, the A-phase fifth coil a5 of the second type of stator, the A-phase sixth coil a6 of the second type of stator, the A-phase seventh coil a7 of the second type of stator and the A-phase eighth coil a8 of the second type of stator. The winding path of the A-phase first coil a1 of the second type of stator is: upper layer of slot No. 1, lower layer of slot No. 12, upper layer of slot No. 25, lower layer of slot No. 36; the winding path of the A-phase second coil a2 of the second type of stator is: upper layer of slot No. 2, lower layer of slot No. 13, upper layer of slot No. 26, lower layer of slot No. 37; the winding path of the A-phase third coil a3 of the second type of stator is: upper layer of slot No. 3, lower layer of slot No. 14 The winding path of the fourth coil a4 of the A phase of the second type of stator is: the upper layer of slot No. 4, the lower layer of slot No. 15, the upper layer of slot No. 28, and the lower layer of slot No. 39; the winding path of the fifth coil a5 of the A phase of the second type of stator is: the upper layer of slot No. 13, the lower layer of slot No. 24, the upper layer of slot No. 37, and the lower layer of slot No. 48; the winding path of the sixth coil a6 of the A phase of the second type of stator is: the upper layer of slot No. 14, the lower layer of slot No. 25, the upper layer of slot No. 38, and the lower layer of slot No. 1; the winding path of the seventh coil a7 of the A phase of the second type of stator is: the upper layer of slot No. 15, the lower layer of slot No. 26, the upper layer of slot No. 39, and the lower layer of slot No. 2; the winding path of the eighth coil a8 of the A phase of the second type of stator is: the upper layer of slot No. 16, the lower layer of slot No. 27, the upper layer of slot No. 40, and the lower layer of slot No. 3;

[0054] The B-phase winding of the second type of stator includes the B-phase first coil b1 of the second type of stator, the B-phase second coil b2 of the second type of stator, the B-phase third coil b3 of the second type of stator, the B-phase fourth coil b4 of the second type of stator, the B-phase fifth coil b5 of the second type of stator, the B-phase sixth coil b6 of the second type of stator, the B-phase seventh coil b7 of the second type of stator and the B-phase eighth coil b8 of the second type of stator. The winding path of the B-phase first coil b1 of the second type of stator is: upper layer of slot No. 9, lower layer of slot No. 20, upper layer of slot No. 33, lower layer of slot No. 44; the winding path of the B-phase second coil b2 of the second type of stator is: upper layer of slot No. 10, lower layer of slot No. 21, upper layer of slot No. 34, lower layer of slot No. 45; the winding path of the B-phase third coil b3 of the second type of stator is: upper layer of slot No. 11, lower layer of slot No. 22 The winding path of the fourth coil b4 of the B phase of the second type of stator is: the upper layer of slot No. 12, the lower layer of slot No. 23, the upper layer of slot No. 36, and the lower layer of slot No. 47; the winding path of the fifth coil b5 of the B phase of the second type of stator is: the upper layer of slot No. 21, the lower layer of slot No. 32, the upper layer of slot No. 45, and the lower layer of slot No. 8; the winding path of the sixth coil b6 of the B phase of the second type of stator is: the upper layer of slot No. 22, the lower layer of slot No. 33, the upper layer of slot No. 46, and the lower layer of slot No. 9; the winding path of the seventh coil b7 of the B phase of the second type of stator is: the upper layer of slot No. 23, the lower layer of slot No. 34, the upper layer of slot No. 47, and the lower layer of slot No. 10; the winding path of the eighth coil b8 of the B phase of the second type of stator is: the upper layer of slot No. 24, the lower layer of slot No. 35, the upper layer of slot No. 48, and the lower layer of slot No. 11;

[0055] The C-phase winding of the second type of stator includes the C-phase first coil c1 of the second type of stator, the C-phase second coil c2 of the second type of stator, the C-phase third coil c3 of the second type of stator, the C-phase fourth coil c4 of the second type of stator, the C-phase fifth coil c5 of the second type of stator, the C-phase sixth coil c6 of the second type of stator, the C-phase seventh coil c7 of the second type of stator and the C-phase eighth coil c8 of the second type of stator. The winding path of the C-phase first coil c1 of the second type of stator 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 C-phase second coil c2 of the second type of stator 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 C-phase third coil c3 of the second type of stator is: upper layer of slot 19, lower layer of slot 30 The winding path of the fourth coil c4 of the C phase of the second type of stator is: the upper layer of slot No. 20, the lower layer of slot No. 31, the upper layer of slot No. 44, and the lower layer of slot No. 7; the winding path of the fifth coil c5 of the C phase of the second type of stator is: the upper layer of slot No. 29, the lower layer of slot No. 40, the upper layer of slot No. 5, and the lower layer of slot No. 16; the winding path of the sixth coil c6 of the C phase of the second type of stator is: the upper layer of slot No. 30, the lower layer of slot No. 41, the upper layer of slot No. 6, and the lower layer of slot No. 17; the winding path of the seventh coil c7 of the C phase of the second type of stator is: the upper layer of slot No. 31, the lower layer of slot No. 42, the upper layer of slot No. 7, and the lower layer of slot No. 18; the winding path of the eighth coil c8 of the C phase of the second type of stator is: the upper layer of slot No. 32, the lower layer of slot No. 43, the upper layer of slot No. 8, and the lower layer of slot No. 19.

[0056] Similar to the first and second embodiments, the stator winding structure arranged according to the same rule is also applicable to a 36-slot 6-pole three-phase motor and a 72-slot 12-pole three-phase motor.

Claims

1. A stator winding of a double-layer integer-slot permanent magnet motor, comprising a plurality of coils disposed in stator slots, wherein the number of motor poles of the stator winding is defined as m, the number of stator slots is defined as N, the number of phases is defined 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 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 in sequence. 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 is composed of (N / m-1) initial connection segments connected end to end and numbered in sequence. The compensation coil is composed of (N / m-1) compensation connection segments connected end to end and numbered in sequence. The number n1 of slots occupied by initial connection segments with odd serial numbers is N / m, and the number n2 of slots occupied by initial connection segments with even serial numbers is N / m+2. 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 serial number plus the difference α, α=N / m, and the number of slots occupied by the compensation connecting segment and the initial connecting segment with the same serial number is the same; The starting slot number of the initial coil in the next phase is the starting slot number of the initial coil with the same serial number in the previous phase plus a difference β, 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 a motor pole number m=4, a stator slot number N=24, a phase number k=3, and a coil number c=4 in each phase. The stator winding is defined as comprising a first-type stator A-phase winding, a first-type stator B-phase winding, and a first-type stator C-phase winding. Each stator slot is numbered sequentially, and the p-th stator slot is designated as slot number p, where 1≤p≤24. The A-phase winding of the first type of stator includes an A-phase first coil of the first type of stator, an A-phase second coil of the first type of stator, an A-phase third coil of the first type of stator and an A-phase fourth coil of the first type of stator. The winding path of the A-phase first coil of the first type of stator 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 A-phase second coil of the first type of stator 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 A-phase third coil of the first type of stator 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 A-phase fourth coil of the first type of stator 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 B-phase first coil of the first type of stator, a B-phase second coil of the first type of stator, a B-phase third coil of the first type of stator and a B-phase fourth coil of the first type of stator. The winding path of the B-phase first coil of the first type of stator is: upper layer of slot No. 5, lower layer of slot No. 10, upper layer of slot No. 17, lower layer of slot No. 22; the winding path of the B-phase second coil of the first type of stator is: upper layer of slot No. 6, lower layer of slot No. 11, upper layer of slot No. 18, lower layer of slot No. 23; the winding path of the B-phase third coil of the first type of stator is: upper layer of slot No. 11, lower layer of slot No. 16, upper layer of slot No. 23, lower layer of slot No. 4; the winding path of the B-phase fourth coil of the first type of stator is: upper layer of slot No. 12, lower layer of slot No. 17, upper layer of slot No. 24, lower layer of slot No. 5; The C-phase winding of the first type of stator includes a C-phase first coil of the first type of stator, a C-phase second coil of the first type of stator, a C-phase third coil of the first type of stator and a C-phase fourth coil of the first type of stator. The winding path of the C-phase first coil of the first type of stator is: upper layer of slot No. 9, lower layer of slot No. 14, upper layer of slot No. 21, lower layer of slot No. 2; the winding path of the C-phase second coil of the first type of stator is: upper layer of slot No. 10, lower layer of slot No. 15, upper layer of slot No. 22, lower layer of slot No. 3; the winding path of the C-phase third coil of the first type of stator is: upper layer of slot No. 15, lower layer of slot No. 20, upper layer of slot No. 3, lower layer of slot No. 8; the winding path of the C-phase fourth coil of the first type of stator is: upper layer of slot No. 16, lower layer of slot No. 21, upper layer of slot No. 4, lower layer of slot No.

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 a motor pole number m=4, a stator slot number N=48, a phase number k=3, and a coil number c=8 in each phase. The stator winding is defined as comprising a second-type stator A-phase winding, a second-type stator B-phase winding, and a second-type stator C-phase winding. Each stator slot is numbered sequentially, and the qth stator slot is designated as slot number q, where 1≤q≤48. The A-phase winding of the second type of stator includes the A-phase first coil of the second type of stator, the A-phase second coil of the second type of stator, the A-phase third coil of the second type of stator, the A-phase fourth coil of the second type of stator, the A-phase fifth coil of the second type of stator, the A-phase sixth coil of the second type of stator, the A-phase seventh coil of the second type of stator and the A-phase eighth coil of the second type of stator. The winding path of the A-phase first coil of the second type of stator is: upper layer of slot No. 1, lower layer of slot No. 12, upper layer of slot No. 25, lower layer of slot No. 36; the winding path of the A-phase second coil of the second type of stator is: upper layer of slot No. 2, lower layer of slot No. 13, upper layer of slot No. 26, lower layer of slot No. 37; the winding path of the A-phase third coil of the second type of stator is: upper layer of slot No. 3, lower layer of slot No. 14, lower layer of slot No. 27 The winding path of the fourth coil of the A phase of the second type of stator is: the upper layer of slot No. 4, the lower layer of slot No. 15, the upper layer of slot No. 28, and the lower layer of slot No. 39; the winding path of the fifth coil of the A phase of the second type of stator is: the upper layer of slot No. 13, the lower layer of slot No. 24, the upper layer of slot No. 37, and the lower layer of slot No. 48; the winding path of the sixth coil of the A phase of the second type of stator is: the upper layer of slot No. 14, the lower layer of slot No. 25, the upper layer of slot No. 38, and the lower layer of slot No. 1; the winding path of the seventh coil of the A phase of the second type of stator is: the upper layer of slot No. 15, the lower layer of slot No. 26, the upper layer of slot No. 39, and the lower layer of slot No. 2; the winding path of the eighth coil of the A phase of the second type of stator is: the upper layer of slot No. 16, the lower layer of slot No. 27, the upper layer of slot No. 40, and the lower layer of slot No. 3; The B-phase winding of the second type of stator includes a B-phase first coil of the second type of stator, a B-phase second coil of the second type of stator, a B-phase third coil of the second type of stator, a B-phase fourth coil of the second type of stator, a B-phase fifth coil of the second type of stator, a B-phase sixth coil of the second type of stator, a B-phase seventh coil of the second type of stator and a B-phase eighth coil of the second type of stator. The winding path of the B-phase first coil of the second type of stator is: upper layer of slot No. 9, lower layer of slot No. 20, upper layer of slot No. 33, lower layer of slot No. 44; the winding path of the B-phase second coil of the second type of stator is: upper layer of slot No. 10, lower layer of slot No. 21, upper layer of slot No. 34, lower layer of slot No. 45; the winding path of the B-phase third coil of the second type of stator is: upper layer of slot No. 11, lower layer of slot No. 22, lower layer of slot No. 35 The winding path of the fourth coil of the B phase of the second type of stator is: the upper layer of slot No. 12, the lower layer of slot No. 23, the upper layer of slot No. 36, and the lower layer of slot No. 47; the winding path of the fifth coil of the B phase of the second type of stator is: the upper layer of slot No. 21, the lower layer of slot No. 32, the upper layer of slot No. 45, and the lower layer of slot No. 8; the winding path of the sixth coil of the B phase of the second type of stator is: the upper layer of slot No. 22, the lower layer of slot No. 33, the upper layer of slot No. 46, and the lower layer of slot No. 9; the winding path of the seventh coil of the B phase of the second type of stator is: the upper layer of slot No. 23, the lower layer of slot No. 34, the upper layer of slot No. 47, and the lower layer of slot No. 10; the winding path of the eighth coil of the B phase of the second type of stator is: the upper layer of slot No. 24, the lower layer of slot No. 35, the upper layer of slot No. 48, and the lower layer of slot No. 11; The C-phase winding of the second type of stator includes a C-phase first coil of the second type of stator, a C-phase second coil of the second type of stator, a C-phase third coil of the second type of stator, a C-phase fourth coil of the second type of stator, a C-phase fifth coil of the second type of stator, a C-phase sixth coil of the second type of stator, a C-phase seventh coil of the second type of stator and a C-phase eighth coil of the second type of stator. The winding path of the C-phase first coil of the second type of stator is: upper layer of slot No. 17, lower layer of slot No. 28, upper layer of slot No. 41, lower layer of slot No. 4; the winding path of the C-phase second coil of the second type of stator is: upper layer of slot No. 18, lower layer of slot No. 29, upper layer of slot No. 42, lower layer of slot No. 5; the winding path of the C-phase third coil of the second type of stator is: upper layer of slot No. 19, lower layer of slot No. 30, lower layer of slot No. 43 The upper layer of slot No. 1 and the lower layer of slot No. 6; the winding path of the C-phase fourth coil of the second type stator is: the upper layer of slot No. 20, the lower layer of slot No. 31, the upper layer of slot No. 44, and the lower layer of slot No. 7; the winding path of the C-phase fifth coil of the second type stator is: the upper layer of slot No. 29, the lower layer of slot No. 40, the upper layer of slot No. 5, and the lower layer of slot No. 16; the winding path of the C-phase sixth coil of the second type stator is: the upper layer of slot No. 30, the lower layer of slot No. 41, the upper layer of slot No. 6, and the lower layer of slot No. 17; the winding path of the C-phase seventh coil of the second type stator is: the upper layer of slot No. 31, the lower layer of slot No. 42, the upper layer of slot No. 7, and the lower layer of slot No. 18; the winding path of the C-phase eighth coil of the second type stator is: the upper layer of slot No. 32, the lower layer of slot No. 43, the upper layer of slot No. 8, and the lower layer of slot No. 19.

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