10K-slot double-layer winding five-phase alternating current motor

Abstract

The invention relates to the technical field of motors, in particular to a 10K-slot double-layer winding five-phase alternating current motor, which comprises a motor rotor and a motor stator, and a five-phase winding is wound on the motor stator; the motor stator comprises 10K stator teeth, and K is an integer greater than or equal to 1; the stator teeth are connected through stator yokes; stator grooves are arranged between two adjacent stator teeth, and the number of the stator grooves is equal to that of the stator teeth. The stator slots adopt a stator winding mode of double-layer windings, each winding is nested in two stator slots, and each stator slot contains two sides of two windings. Compared with a traditional three-phase alternating current motor, the 10K-slot double-layer winding five-phase alternating current motor provided by the invention has higher winding coefficient, higher efficiency and higher torque / power density.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a 10K-slot double-layer winding five-phase AC motor. Background Art

[0002] The five-phase motor decomposes the three-phase electricity into five-phase electricity, and introduces five stator circuits in the rotor to form five weak magnetic fields, which can greatly improve the efficiency of the motor and reduce noise and vibration. Compared with ordinary three-phase motors, five-phase motors have higher stability when carrying loads and longer life.

[0003] Five-phase motors are gradually being used in various occasions, especially in heavy industry and advanced machinery and equipment. In the industrial production process, the five-phase voltage and the current of the five-phase motor will produce a more stable current and stronger torque, making the machine's performance better and working more efficient. Five-phase motors are also gradually being widely used in various special occasions, such as aviation, rail transportation and other fields.

[0004] The existing five-phase motors have many shortcomings, such as being only suitable for small motors, low torque density of single-layer winding schemes, and complex windings that are not suitable for mass production; moreover, single-layer windings affect the torque / power density and efficiency of the motors. Summary of the invention

[0005] The embodiment of the present application provides a 10K-slot double-layer winding five-phase AC motor, which has a higher winding coefficient, higher efficiency, and higher torque / power density than a traditional three-phase AC motor.

[0006] In order to solve the above technical problems, an embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, including: a motor rotor and a motor stator, a five-phase winding is wound on the motor stator; the motor stator includes 10K stator teeth, wherein K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of stator slots and stator teeth is equal; the stator slot adopts a stator winding method of a double-layer winding, each winding is nested in two stator slots, and each stator slot contains two sides of two windings.

[0007] In some exemplary embodiments, the motor stator is an outer rotor structure stator core or an inner rotor structure stator core; when the motor stator is an outer rotor structure stator core, the stator yoke of the outer rotor structure stator core is located on the inner side of the core, the hole enclosed by the stator yoke is used to place the rotor bearing, and the motor rotor is enclosed on the outer side of the stator teeth; when the motor stator is an inner rotor structure stator core, the stator yoke of the inner rotor structure stator core is located on the outer side of the core, and the motor rotor is placed in the center of the hole enclosed by the stator teeth.

[0008] In some exemplary embodiments, the five-phase winding is a concentrated five-phase winding or a distributed five-phase winding.

[0009] In some exemplary embodiments, the above-mentioned 10K-slot double-layer winding five-phase AC motor further includes: rotor poles matching the five-phase AC motor, and the number of the rotor poles is 10K±2 or 10K±4.

[0010] In some exemplary embodiments, the five-phase winding is wound on the stator of the motor according to a winding calculation method for the five-phase winding and each stator slot and stator tooth; wherein the winding calculation method comprises: first, calculating the number of basic winding units based on the number of pole pairs of the motor rotor; then, calculating the number of slots of each basic winding unit and the number of poles of each basic winding unit based on the number of basic winding units; next, based on the number of slots of each basic winding unit and the number of poles of each basic winding unit, a table with 5 rows and 2K columns is listed; finally, the number of the stator slot is filled in the table.

[0011] In some exemplary embodiments, the number of basic winding units is calculated based on the number of pole pairs of the motor rotor, including: calculating the number of slots per pole per phase based on the number of pole pairs of the motor rotor; calculating the number of basic winding units based on the number of slots per pole per phase; assuming that the number of pole pairs of the motor rotor is P, where P is equal to 5K±1 or 5K±2, the number of slots per pole per phase is calculated by formula (1):

[0012]

[0013] Where q is the number of slots per pole per phase; a is the largest integer less than q; z is calculated by formula (2):

[0014] z=2P(qa) (2)

[0015] The number of basic winding units is represented by t, where t is the greatest common divisor of z and P; the number of basic winding units t represents that the motor winding is divided into t groups of windings that are repeated in form.

[0016] In some exemplary embodiments, based on the number of basic winding units, the number of slots of each basic winding unit and the number of poles of each basic winding unit are calculated, including: based on the number of basic winding units, using formula (3) to calculate the number of slots of each basic winding unit:

[0017]

[0018] Where, t is the number of basic winding units; N t is the number of slots for each basic winding unit;

[0019] Based on the number of basic winding units, the number of pole pairs of each basic winding unit is calculated using formula (4):

[0020]

[0021] Where P is the number of pole pairs of the motor rotor, P is equal to 5K±1 or 5K±2; P t The number of pole pairs for each basic winding unit.

[0022] In some exemplary embodiments, the numbers of the stator slots are filled into a table, comprising the following steps: Step 1: Fill the slot No. 1 in the first row and first column of the table, i.e. (1,1); then fill the next slot number across P in each basic winding unit in a sequence from left to right and from top to bottom. t Then fill the new cell with the i-th slot in iP t +1; when the rightmost cell of each row under the current basic winding unit is filled, start filling from a new row under the current basic winding unit; fill in the numbers of all stator slots in the table cells in the order of filling one basic winding unit first and then filling the next basic winding unit; if a cell has been filled with other slot numbers, fill it in the nearest empty cell in sequence; Step 2: Divide the cells under each basic winding unit in the table into a left half and a right half, the left half is Column, the right half is Column; among them, N t The value of / 10 is rounded up; the left half is kept unchanged, and the rows of the right half are shifted upward by two rows as a whole, that is, the first row of the right half moves to the fourth row, the second row moves to the fifth row, the third row moves to the first row, the fourth row moves to the second row, and the fifth row moves to the third row; after the movement, the number of each stator slot is multiplied by -1, indicating that the coil side in the stator slot generates a reverse potential, and the coil side in the stator slot is the coil side; Step 3: Form a five-phase motor winding arrangement table; determine the slot number of each phase winding of the motor and the direction of the coil side in the slot according to the data in each row of the table.

[0023] In some exemplary embodiments, the numbers in the five-phase motor winding arrangement table represent the stator slot number where the coil side of each coil is located, and the motor phase number to which the coil side belongs.

[0024] In some exemplary embodiments, in the five-phase motor winding arrangement table, the coil side in the stator slot in the first row belongs to the coil of phase A of the five-phase motor, and the positive slot number represents that the back electromotive force is positive, and the negative slot number represents that the back electromotive force is negative; the coil side in the stator slot in the second row of the table belongs to the coil of phase B of the five-phase motor; the coil side in the stator slot in the third row belongs to phase C; the coil side in the stator slot in the fourth row belongs to phase D; and the coil side in the stator slot in the fifth row belongs to phase E.

[0025] In some exemplary embodiments, if a concentrated winding scheme is adopted, the numbers of the stator slots in the five-phase motor winding arrangement table are the tooth numbers of the teeth around which the slots are wound.

[0026] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0027] The embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, including: a motor rotor and a motor stator, a five-phase winding is wound on the motor stator; the motor stator includes 10K stator teeth, wherein K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of stator slots and stator teeth is equal; the stator slot adopts a stator winding method of a double-layer winding, each winding is nested in two stator slots, and each stator slot contains two sides of two windings. The present application proposes a five-phase AC motor with a 10K slot stator double-layer winding, and based on the stator structure, proposes a stator winding scheme under the coordination of the pole slots of 10K±2 or 10K±4 magnetic poles of the rotor. The stator structure, motor pole slot coordination scheme, winding winding method, etc. proposed in the present application have the advantages of simple structure, convenient large-scale production and manufacturing, and high torque / power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute proportional limitations.

[0029] Figure 1 A schematic diagram of the stator core structure of an outer rotor structure provided in one embodiment of the present application.

[0030] Figure 2 A schematic diagram of the stator core structure of an inner rotor structure provided in one embodiment of the present application.

[0031] Figure 3 A schematic diagram of the structure of an outer rotor motor provided in one embodiment of the present application.

[0032] Figure 4 A schematic diagram of the structure of an inner rotor motor provided in one embodiment of the present application.

[0033] Figure 5 A schematic diagram of a double-layer concentrated winding structure provided in one embodiment of the present application.

[0034] Figure 6 A schematic diagram of the structure of a double-layer distributed winding (span is 2) provided in one embodiment of the present application.

[0035] Figure 7A schematic diagram of the winding method of a 20-slot, 16-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0036] Figure 8 A schematic diagram of the winding method of a 30-slot, 32-pole, five-phase double-layer concentrated winding (span y=2) motor provided in an embodiment of the present application.

[0037] Fig. 9 A schematic diagram of the winding method of a 20-slot, 18-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0038] Fig.10 A schematic diagram of the winding method of a 20-slot, 22-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0039] Fig.11 A schematic diagram of the winding method of a 20-slot, 24-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0040] Fig.12 Schematic diagram of the winding method of a 30-slot, 32-pole, five-phase double-layer concentrated winding (span y=1) motor provided in one embodiment of the present application.

[0041] Fig.13 A schematic diagram of the winding method of a 30-slot, 34-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0042] Fig.14 A schematic diagram of the winding method of a 30-slot, 28-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0043] Fig.15 A schematic diagram of the winding method of a 30-slot, 26-pole, five-phase double-layer concentrated winding (span y=1) motor provided in an embodiment of the present application.

[0044] Reference numerals: 101 - stator teeth; 102 - stator slots; 103 - stator yoke; 104 - rotor bearing holes; 105 - rotor core; 106 - rotor poles; 107 - rotor shaft. DETAILED DESCRIPTION

[0045] As can be seen from the background technology, the existing five-phase motors have many shortcomings, such as being only suitable for small motors, the single-layer winding solution has a low torque density, and the winding is complex and not suitable for mass production; moreover, the single-layer winding affects the torque / power density and efficiency of the motor.

[0046] The related art proposes a five-phase motor structure with ten stator teeth (10 slots) and its winding method. However, this motor is suitable for small servos and has a small number of poles. It is not suitable for medium and large-volume, high-power servo systems. Another related art proposes a five-phase motor with 20K slots and (20±2)K rotor poles, where K is an integer. However, this solution requires that each winding be nested in two slots, and each slot contains only one side of a winding, that is, the motor is in the form of a single-layer winding. Another related art proposes another five-phase motor structure with ten stator teeth (10 slots) and its winding method. However, this motor is a single-layer winding, resulting in low torque density and power density.

[0047] The related technology proposes a 45-slot five-phase motor and winding method. The 45 slots are divided into 3 groups of 15-slot units. Through the 15-slot stator unit, each stator slot unit is wound with 2 single-layer windings and 1 double-layer winding to achieve the enhancement of the third harmonic. However, this method has too many slots and the winding is complicated, which is not conducive to mass production. Another related technology proposes a 60-slot five-phase motor and winding method, but the scheme has too many slots and the winding is complicated, which is not conducive to mass production. The related technology proposes a brushed DC motor rotor structure based on a 20-slot rotor. However, this structure is a rotor structure of a DC brushed motor, and a commutator (brush) is required to rotate the motor. There is also a five-phase motor structure for electric vehicles in the related technology, but the structure consists of 45 slots, but this scheme is also a single-layer winding, and the torque density is low.

[0048] As mentioned above, the existing five-phase motors either have a single-layer winding solution with low torque density, or the winding is complex and not suitable for mass production, or are only suitable for small motors, or the single-layer winding affects the torque / power density and efficiency of the motor.

[0049] Therefore, in order to solve the above technical problems, the embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, including: a motor rotor and a motor stator, a five-phase winding is wound on the motor stator; the motor stator includes 10K stator teeth, wherein K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of stator slots and stator teeth is equal; the stator slot adopts a stator winding method of a double-layer winding, each winding is nested in two stator slots, and each stator slot contains two sides of two windings. The embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, which has a higher winding coefficient, higher efficiency, and higher torque / power density than a traditional three-phase AC motor.

[0050] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present application can be implemented.

[0051] The number of teeth (slots), the number of motor poles, the number of motor phases, and the winding method of the motor winding of the AC motor directly determine important indicators such as the efficiency, torque density, and power density of the motor. The embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, including: a motor rotor and a motor stator, a five-phase winding is wound on the motor stator; the motor stator includes 10K stator teeth, where K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of stator slots and stator teeth is equal; the stator slot adopts a stator winding method of double-layer winding, each winding is nested in two stator slots, and each stator slot contains two sides of two windings. The five-phase AC motor with a 10K slot stator double-layer winding provided in the present application has the advantages of simple structure, convenient large-scale production and manufacturing, and high torque / power density.

[0052] In some embodiments, the motor stator is an outer rotor structure stator core or an inner rotor structure stator core; when the motor stator is an outer rotor structure stator core, the stator yoke of the outer rotor structure stator core is located on the inner side of the core, the hole enclosed by the stator yoke is used to place the rotor bearing, and the motor rotor is enclosed on the outer side of the stator teeth; when the motor stator is an inner rotor structure stator core, the stator yoke of the inner rotor structure stator core is located on the outer side of the core, and the motor rotor is placed in the center of the hole enclosed by the stator teeth.

[0053] Specifically, the stator core of the 10K tooth / slot five-phase AC motor proposed in the embodiment of the present application can be divided into an outer rotor structure core (such as Figure 1 As shown) and the inner rotor structure core (as Figure 2 As shown in Figure 1 and Figure 2 As shown, the stator core structure of the five-phase AC motor with 10K teeth / slots proposed in the present application includes 10K stator teeth 101, and a stator slot 102 is provided between two adjacent stator teeth 101. The number of stator slots 102 is equal to the number of stator teeth 101, that is, the number of stator slots 102 is also 10K, wherein K is an integer greater than or equal to 1; each stator tooth 101 is connected to each other through a stator yoke 103.

[0054] According to the different ways of setting the motor rotor, the motor stator can be divided into an outer rotor structure stator core and an inner rotor structure stator core. The stator yoke 103 of the outer rotor structure stator core is located on the inner side of the rotor core 105 (such as Figure 3 As shown in FIG. 1 , the hole enclosed by the stator yoke 103 is used to place the rotor bearing, the motor rotor is enclosed on the outside of the stator teeth 101, and stator slots 102 are provided between adjacent stator teeth 101. Figure 3 As shown, the rotor core 105 is located outside the stator teeth 101, and the rotor poles 106 are arranged inside the rotor core 105. The stator yoke 103 of the inner rotor structure stator core is located outside the rotor core 105 (as shown in FIG. Figure 4 As shown in FIG. 1 , the rotor core 105 is arranged at the center of the hole surrounded by the stator teeth 101, the rotor core 105 is provided with a rotor pole 106, and the rotor shaft 107 is provided at the center of the hole.

[0055] In some embodiments, the five-phase winding is a concentrated five-phase winding or a distributed five-phase winding.

[0056] The 10K tooth / slot stator proposed in this application adopts double-layer winding. "Double-layer" means that two phase winding coils are embedded in one tooth slot at the same time. Figure 5 The coils of the first phase winding and the second phase winding each have one coil side located in the slot between the 19th and 20th teeth. In particular, when each winding coil is wound around only one stator tooth 101 and not wound around other teeth, it is called "concentrated" winding, e.g. Figure 5 The second phase winding is only wound on the 19th tooth, and the first phase winding is only wound on the 20th tooth. This winding method is called "concentrated" winding. "Concentrated" winding is a special case of the 10K slot structure proposed in this application. Figure 6 As shown in the figure, the first phase winding spans across two stator teeth, so it is no longer a concentrated winding, but a distributed winding with a span y=2.

[0057] like Figure 3 and Figure 4 As shown, in some embodiments, the above-mentioned 10K slot double-layer winding five-phase AC motor further includes: a rotor pole 106 matched with the five-phase AC motor, and the number of the rotor poles 106 is 10K±2 or 10K±4. After testing, such a number of rotor poles and a 10K slot double-layer winding stator have the best motor performance.

[0058] In some embodiments, according to the winding calculation method of the five-phase winding and each stator slot and stator tooth, the five-phase winding is wound on the stator of the motor; wherein the winding calculation method comprises the following steps: first, based on the number of pole pairs of the motor rotor, the number of basic winding units is calculated; then, based on the number of basic winding units, the number of slots of each basic winding unit and the number of poles of each basic winding unit are calculated; next, based on the number of slots of each basic winding unit and the number of poles of each basic winding unit, a table with 5 rows and 2K columns is listed; finally, the number of the stator slot is filled in the table.

[0059] In some embodiments, the number of basic winding units is calculated based on the number of pole pairs of the motor rotor, including: calculating the number of slots per pole per phase based on the number of pole pairs of the motor rotor; calculating the number of basic winding units based on the number of slots per pole per phase; assuming that the number of pole pairs of the motor rotor is P, where P is equal to 5K±1 or 5K±2, the number of slots per pole per phase is calculated by formula (1):

[0060]

[0061] Where q is the number of slots per pole per phase; a is the largest integer less than q; z is calculated by formula (2):

[0062] z=2P(qa) (2)

[0063] The number of basic winding units is represented by t, where t is the greatest common divisor of z and P; the number of basic winding units t represents that the motor winding is divided into t groups of windings that are repeated in form.

[0064] In some embodiments, based on the number of basic winding units, the number of slots of each basic winding unit and the number of poles of each basic winding unit are calculated, including: based on the number of basic winding units, using formula (3) to calculate the number of slots of each basic winding unit:

[0065]

[0066] Where, t is the number of basic winding units; N t is the number of slots for each basic winding unit;

[0067] Based on the number of basic winding units, the number of pole pairs of each basic winding unit is calculated using formula (4):

[0068]

[0069] Where P is the number of pole pairs of the motor rotor, P is equal to 5K±1 or 5K±2; P t The number of pole pairs for each basic winding unit.

[0070] Specifically, based on the number of slots of each basic winding unit and the number of poles of each basic winding unit, a table with 5 rows and 2K columns is listed, as shown in Table 1. The number filled in the cell between the row and column in Table 1 is the number of the cell at that location in Table 1.

[0071] Table 1 Table cell number

[0072]

[0073] In some embodiments, filling in the numbers of the stator slots into a table comprises the following steps:

[0074] Step 1: Fill slot 1 in the first row and first column of the table, that is, (1,1); then in each basic winding unit, from left to right and from top to bottom, fill in the next slot number across P t Then fill the new cell with the i-th slot in iP t +1; when the rightmost cell in each row under the current basic winding unit is filled, start filling from a new row under the current basic winding unit; fill in the numbers of all stator slots in the table cells in the order of filling one basic winding unit first and then the next basic winding unit; if a cell has been filled with other slot numbers, fill it in the nearest empty cell in sequence.

[0075] Step 2: Divide the cells under each basic winding unit in the table into left and right halves. The left half is Column, the right half is Column; among them, N t The value of / 10 is rounded up; keeping the left half unchanged, the rows of the right half are shifted upward by two rows as a whole, that is, the first row of the right half moves to the fourth row, the second row moves to the fifth row, the third row moves to the first row, the fourth row moves to the second row, and the fifth row moves to the third row; after the movement, the number of each stator slot is multiplied by -1, indicating that the coil side in the stator slot generates a reverse electric potential, and the coil side in the stator slot is the coil side.

[0076] Step 3: Form a five-phase motor winding arrangement table; determine the slot number of each phase winding of the motor and the direction of the coil edge in the slot based on the data in each row of the table.

[0077] In some embodiments, the numbers in the five-phase motor winding arrangement table represent the stator slot number where the coil side of each coil is located, and the motor phase number to which the coil side belongs.

[0078] Specifically, in step 1, fill slot 1 in the first row and first column of the table, that is, (1,1), and then fill slot 2 in the number P backward. t The position of the cell, that is, P t +1 cell. Then fill slot 3 in 2P t +1, and so on, place the i-th slot (i≤N t / P t ) Fill in the iP t +1 cell. When i is greater than N t / P t When, iP t +1 will be greater than N t , then more than N tThe part is still filled in from the first row and first column of the cell under the basic winding unit. If this cell has been filled with other slot numbers, it is filled in the nearest empty cell in sequence. For example, if the current is the tth basic winding, then from (t-1)N t +1 cell is filled in the nearest empty cell in sequence until all cells under the basic unit winding are filled, and then the first cell under the new basic unit winding (the t+1th basic winding), that is, tN t +1 cell, and fill it in. And so on, until all the slot numbers are filled in the cells of table 1.

[0079] After completing step 1 above, in step 2, the cells under each basic winding unit in Table 1 are divided into left and right parts, and then the left half is kept unchanged, and the rows of the right half are shifted upward by two rows, that is, the first row of the right half is moved to the fourth row, the second row is moved to the fifth row, the third row is moved to the first row, the fourth row is moved to the second row, and the fifth row is moved to the third row. After the movement, the number of each slot is multiplied by -1, indicating that the coil side in the slot generates a reverse potential.

[0080] After the above operation, Table 1 shows the potential trend of the coil side in each slot and which phase of the motor the coil side belongs to.

[0081] In some embodiments, in the five-phase motor winding arrangement table, the coil side in the stator slot in the first row belongs to the coil of phase A of the five-phase motor, the positive slot number represents that the back electromotive force is positive, and the negative slot number represents that the back electromotive force is negative; the coil side in the stator slot in the second row of the table belongs to the coil of phase B of the five-phase motor; the coil side in the stator slot in the third row belongs to phase C; the coil side in the stator slot in the fourth row belongs to phase D; the coil side in the stator slot in the fifth row belongs to phase E.

[0082] Therefore, the back EMF direction of a winding coil side and the phase of the motor to which the coil side belongs have been determined in each of the 10K slots of the stator, and the slot numbers in Table 1 are the numbers of the coil side on the left side of each coil. Therefore, if a centralized winding is used, the slot numbers in Table 1 are also the tooth numbers of the teeth wound by the centralized winding. Since the proposed stator winding method is a double-layer winding, that is, there are two coil sides in each slot, the slot number of the other coil side of each coil in Table 1 is the slot number in Table 1 plus the span y and then the reverse sign. For easy observation, a column can be added to the right of each column of cells in Table 1 to fill in the corresponding slot number of the other coil side.

[0083] At this point, the 10K slot double-layer winding method proposed in this application has been introduced. The following will take several pole-slot combinations as examples to specifically introduce the practical application of the above winding calculation method. Specifically, the winding winding method of a double-layer winding five-phase motor with 20 slots and 16 poles, 30 slots and 32 poles, 20 slots and 18 poles, 20 slots and 22 poles, 20 slots and 24 poles, 30 slots and 34 poles, 30 slots and 28 poles, and 30 slots and 26 poles is specifically described below.

[0084] First, the application of the above winding calculation method in a 20-slot 16-pole five-phase double-layer winding motor is introduced.

[0085] Step 1: Since the number of stator slots is 20, K = 2; 16 poles correspond to the number of rotor pole pairs P = 8. Substituting into equations (1) to (4), we have q = 2 / 8; a = 0; z = 4; t = 4; N t =5;P t =2. According to the above results, N t =5 is substituted into Table 1, then Table 1 can be rewritten as Table 2.

[0086] Table 2 20-slot 16-pole meter cell number

[0087]

[0088]

[0089] Start numbering the slots from 1, and number each slot in the cells under a basic winding unit from left to right and from top to bottom in the order of P in step 1 above. t Fill in the cells in Table 2. When all cells under a basic winding unit are filled, start filling in the cells under the next basic winding. t =2, so Table 2 filled in according to step 1 is as shown in Table 3.

[0090] Table 3 20-slot 16-pole five-phase motor winding arrangement table (step 1)

[0091]

[0092] Step 2: According to the above step 2, the cells under each basic winding unit in Table 3 need to be divided into two parts, because N t =5, That is, after the cells under each basic winding unit in Table 3 are divided into left and right halves, the left half is column 1 and the right half is column 0. According to step 2, the left half of column 1 of each basic winding unit does not need to be operated, so after step 2 is operated, Table 3 does not change.

[0093] Step 3: Table 3 shows the potential direction of the coil side in each slot of the 20-slot, 16-pole, five-phase double-layer winding motor, and which phase of the motor the coil side belongs to. The coil side in the stator slot in the first row of the table belongs to the coil of phase A of the five-phase motor, and the slot number is positive, which means that the back electromotive force is positive. The coil side in the stator slot in the second row of the table belongs to the coil of phase B of the five-phase motor; the coil side in the stator slot in the third row belongs to phase C; the coil side in the stator slot in the fourth row belongs to phase D; the coil side in the stator slot in the fifth row belongs to phase E. Thus, the back electromotive force direction of a winding coil side and which phase of the motor the coil side belongs to have been determined in each of the 20 slots of the stator, and the slot numbers in Table 3 are the numbers of the coil side on the left side of each coil. Since the proposed stator winding method is a double-layer winding, that is, there are two coil sides in each slot, the slot number of the other coil side of each coil in Table 3 is the slot number in Table 3 plus the span y and then reversed.

[0094] For the convenience of observation, a column can be added to the right of each column cell in Table 3 to fill in the corresponding slot number of the other coil side. Taking the winding method with span y=1 as an example, the phases and back EMF directions of all coil sides are filled into Table 3 according to step 3 to obtain Table 4.

[0095] Table 4 20-slot 16-pole five-phase motor winding arrangement table (step 3)

[0096]

[0097]

[0098] According to the slot number, back EMF direction, and motor phase of the coil side in Table 4, the winding method of the 20-slot 16-pole five-phase double-layer concentrated winding (span y=1) motor is obtained as follows: Figure 7 As shown. Since the span y = 1, that is, the winding is a concentrated winding, the slot numbers in Table 3 are also the tooth numbers of the teeth wound by the concentrated winding. The corresponding coil side of the slot number in Table 4 is Figure 7 In the figure, the coil side with negative slot number is Figure 7 Indicated by ⊕.

[0099] Similarly, the stator winding calculation method for a 30-slot, 32-pole, five-phase, double-layer winding motor topology is as follows.

[0100] Step 1: Since the number of stator slots is 30, K = 3; 32 poles correspond to the number of rotor pole pairs P = 16. Substituting into equations (1) to (4), we have q = 3 / 16; a = 0; z = 6; t = 2; N t =15;P t =8. According to the above results, N t =15; Substitute into Table 1, then Table 1 can be rewritten as Table 5.

[0101] Table 5 30-slot 32-pole meter cell number

[0102]

[0103] Start numbering the slots from 1, and number each slot in the cells under a basic winding unit from left to right and from top to bottom in the order of P in step 1 above. t Fill in the cells in Table 5. When all the cells under a basic winding unit are filled, start filling in the cells under the next basic winding. t =8, so Table 5 filled in according to step 1 is as shown in Table 6.

[0104] Table 6 30-slot 32-pole five-phase motor winding arrangement table (step 1)

[0105]

[0106] Step 2: According to the above step 2, the cells under each basic winding unit in Table 6 need to be divided into two parts, because N t =15, That is, after the cells under each basic winding unit in Table 6 are divided into two halves, the left half has 2 columns and the right half has 1 column. According to step 2, the 2 columns in the left half of each basic winding unit do not need to be operated, and the 1 column in the right half is moved up by two cells as a whole. Therefore, after step 2, Table 6 changes to Table 7. Among them, the negative sign represents that the back electromotive force of the coil side in the slot is opposite.

[0107] Table 7 30-slot 32-pole five-phase motor winding arrangement table (step 2)

[0108]

[0109] Step 3: Table 7 shows the direction of the potential of the coil side in each slot of the 30-slot, 32-pole, five-phase double-layer winding motor, and which phase of the motor the coil side belongs to. The coil side in the stator slot in the first row of the table belongs to the coil of phase A of the five-phase motor, and the slot number is positive, which means that the back electromotive force is positive. The coil side in the stator slot in the second row of the table belongs to the coil of phase B of the five-phase motor; the coil side in the stator slot in the third row belongs to phase C; the coil side in the stator slot in the fourth row belongs to phase D; and the coil side in the stator slot in the fifth row belongs to phase E. Thus, the back electromotive force direction of a winding coil side and which phase of the motor the coil side belongs to have been determined in each of the 20 slots of the stator, and the slot numbers in Table 7 are the numbers of the coil side on the left side of each coil. Since the proposed stator winding method is a double-layer winding, that is, there are two coil sides in each slot, the slot number of the other coil side of each coil in Table 7 is the slot number in Table 7 plus the span y and then the reverse sign.

[0110] For the convenience of observation, a column can be added to the right of each column cell in Table 7 to fill in the corresponding slot number of the other coil side. Taking the winding method with span y=2 as an example, the phases and back EMF directions of all coil sides are filled into Table 7 according to step 3 to obtain Table 8.

[0111] Table 8 30-slot 32-pole five-phase motor winding arrangement table (step 3)

[0112]

[0113] According to the slot number, back EMF direction, and motor phase of the coil side in Table 8, the winding method of the 30-slot 32-pole five-phase double-layer winding (span y=2) motor is obtained as follows: Figure 8 As shown in Table 8, the coil side corresponding to the positive slot number is Figure 8 In the figure, the coil side with negative slot number is Figure 8 Indicated by ⊕.

[0114] Similarly, other pole-slot combinations with better performance can be calculated by the method proposed above, such as: 20-slot 18-pole five-phase double-layer winding motor, 20-slot 22-pole five-phase double-layer winding motor, 20-slot 24-pole five-phase double-layer winding motor, 30-slot 32-pole five-phase double-layer winding motor, 30-slot 34-pole five-phase double-layer winding motor, 30-slot 28-pole five-phase double-layer winding motor, 30-slot 26-pole five-phase double-layer winding motor. These pole-slot combinations with better performance are introduced below.

[0115] For a 20-slot, 18-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 9.

[0116] Table 9 20-slot 18-pole five-phase motor winding arrangement table (step 3)

[0117]

[0118] According to the slot number, back EMF direction, and motor phase of the coil side in Table 9, the winding method of the 20-slot 18-pole five-phase double-layer winding (span y=1) motor is obtained as follows: Fig. 9 As shown in Table 9, the coil side corresponding to the positive slot number is Fig. 9 In the figure, the coil side with negative slot number is Fig. 9 Indicated by ⊕.

[0119] For a 20-slot, 22-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table obtained by using the winding calculation method proposed in this application is shown in Table 10.

[0120] Table 10 20-slot 22-pole five-phase motor winding arrangement table (step 3)

[0121]

[0122] According to the slot number, back EMF direction, and motor phase of the coil side in Table 10, the winding method of the 20-slot 22-pole five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.10 As shown in Table 10, the coil side corresponding to the positive slot number is Fig.10 In the figure, the coil side with negative slot number is Fig.10 Indicated by ⊕.

[0123] For a 20-slot, 24-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 11.

[0124] Table 11 20-slot 24-pole five-phase motor winding arrangement table (step 3)

[0125]

[0126] According to the slot number, back EMF direction, and motor phase of the coil side in Table 11, the winding method of the 20-slot 24-pole five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.11 As shown in Table 11, the coil side corresponding to the positive slot number is Fig.11 In the figure, the coil side with negative slot number is Fig.11 Indicated by ⊕.

[0127] For a 30-slot, 32-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 12.

[0128] Table 12 30-slot 32-pole five-phase motor winding arrangement table (step 3)

[0129]

[0130] According to the slot number, back EMF direction, and motor phase of the coil side in Table 12, the winding method of the 30-slot, 32-pole, five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.12 As shown in Table 12, the coil side corresponding to the positive slot number is Fig.12 In the figure, the coil side with negative slot number is Fig.12 Indicated by ⊕.

[0131] For a 30-slot, 34-pole, five-phase double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 13.

[0132] Table 13 30-slot 34-pole five-phase motor winding arrangement table (step 3)

[0133]

[0134]

[0135] According to the slot number, back EMF direction, and motor phase of the coil side in Table 13, the winding method of the 30-slot 34-pole five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.13 As shown in Table 13, the coil side corresponding to the positive slot number is Fig.13 In the figure, the coil side with negative slot number is Fig.13 Indicated by ⊕.

[0136] For a 30-slot, 28-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 14.

[0137] Table 14 30-slot 28-pole five-phase motor winding arrangement table (step 3)

[0138]

[0139] According to the slot number, back EMF direction, and motor phase of the coil side in Table 14, the winding method of the 30-slot, 34-pole, five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.14 As shown in Table 14, the coil side corresponding to the positive slot number is Fig.14 In the figure, the coil side with negative slot number is Fig.14 Indicated by ⊕.

[0140] For a 30-slot, 26-pole, five-phase, double-layer concentrated winding motor, the motor winding arrangement table is obtained using the winding calculation method proposed in this application as shown in Table 15.

[0141] Table 15 30-slot 26-pole five-phase motor winding arrangement table (step 3)

[0142]

[0143]

[0144] According to the slot number, back EMF direction, and motor phase of the coil side in Table 15, the winding method of the 30-slot 26-pole five-phase double-layer winding (span y=1) motor is obtained as follows: Fig.15 As shown in Table 15, the coil side corresponding to the positive slot number is Fig.15 In the figure, the coil side with negative slot number is Fig.15 Indicated by ⊕.

[0145] Compared with the prior art, the 10K slot double-layer winding five-phase AC motor provided by the present application has the following advantages:

[0146] First, the motor of the prior art requires that each winding be nested in two adjacent slots, and each slot contains only one side of a winding, that is, the motor is in a single-layer winding form, and the power density is relatively low. The solution proposed in this application is a double-layer winding form, that is, each slot contains two sides of two windings, which can increase the torque density and efficiency of the motor. Moreover, the number of slots proposed in this application is 10K, and the number of rotor poles is 10K±2 or 10K±4.

[0147] Secondly, the brushed DC motor rotor structure based on a 20-slot rotor in the prior art is a rotor structure of a brushed DC motor, which requires a commutator (brush) to rotate the motor. The structure proposed in this application is an AC motor stator structure, which can generate a rotating magnetic field to drive the rotor to rotate without a commutator (brush). The present application proposes a five-phase AC motor stator structure and a winding method corresponding to different pole numbers. The proposed scheme has a higher winding coefficient, higher efficiency, and higher torque / power density than the traditional three-phase AC motor. In addition, the present application also proposes a stator winding calculation method for the proposed different pole-slot matching schemes. After verification, the scheme is feasible and has strong applicability.

[0148] Based on the above technical scheme, the embodiment of the present application provides a 10K slot double-layer winding five-phase AC motor, including: a motor rotor and a motor stator, a five-phase winding is wound on the motor stator; the motor stator includes 10K stator teeth, wherein K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of stator slots and stator teeth is equal; the stator slot adopts a stator winding method of a double-layer winding, each winding is nested in two stator slots, and each stator slot contains two sides of two windings. The present application proposes a five-phase AC motor with a 10K slot stator double-layer winding, and based on the stator structure, a stator winding scheme is proposed under the coordination of the pole slots of 10K±2 or 10K±4 magnetic poles of the rotor. The stator structure, motor pole slot coordination scheme, winding winding method, etc. proposed in the present application have the advantages of simple structure, convenient large-scale production and manufacturing, and high torque / power density.

[0149] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art can make their own changes and modifications without departing from the spirit and scope of the present application, so the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A 10K slot double-layer winding five-phase AC motor, characterized in that: include: A motor rotor and a motor stator, wherein the motor stator is wound with a five-phase winding; The motor stator includes 10K stator teeth, wherein K is an integer greater than or equal to 1; each stator tooth is connected by a stator yoke; a stator slot is provided between two adjacent stator teeth, and the number of the stator slots is equal to the number of the stator teeth; The stator slot adopts a stator winding method of double-layer windings, each winding is nested in two stator slots, and each stator slot contains two sides of two windings.

2. The 10K slot double-layer winding five-phase AC motor according to claim 1, characterized in that: The motor stator is an outer rotor structure stator core or an inner rotor structure stator core; When the motor stator is an outer rotor structure stator core, the stator yoke of the outer rotor structure stator core is located inside the core, the hole enclosed by the stator yoke is used to place the rotor bearing, and the motor rotor is enclosed outside the stator teeth; When the motor stator is an inner rotor structure stator core, the stator yoke of the inner rotor structure stator core is located outside the core, and the motor rotor is placed at the center of a hole surrounded by stator teeth.

3. The 10K slot double-layer winding five-phase AC motor according to claim 1, characterized in that: The five-phase winding is a centralized five-phase winding or a distributed five-phase winding.

4. The 10K slot double-layer winding five-phase AC motor according to claim 1, characterized in that: Also includes: The number of rotor magnetic poles matched with the five-phase AC motor is 10K±2 or 10K±4.

5. The 10K slot double-layer winding five-phase AC motor according to claim 1, characterized in that: According to the winding calculation method of the five-phase winding and each stator slot and stator tooth, the five-phase winding is wound on the stator of the motor; wherein the winding calculation method includes: Calculate the number of basic winding units based on the number of pole pairs of the motor rotor; Based on the number of basic winding units, the number of slots of each basic winding unit and the number of poles of each basic winding unit are calculated; Based on the number of slots of each basic winding unit and the number of poles of each basic winding unit, a table with 5 rows and 2K columns is listed; Enter the stator slot numbers into the table.

6. The 10K slot double-layer winding five-phase AC motor according to claim 5, characterized in that: Based on the number of pole pairs of the motor rotor, calculate the number of basic winding units, including: Based on the number of pole pairs of the motor rotor, calculate the number of slots per pole per phase; Calculate the number of basic winding units based on the number of slots per pole and per phase; Let the number of pole pairs of the motor rotor be P, where P is equal to 5K±1 or 5K±2, then the number of slots per pole per phase is calculated by formula (1): Where q is the number of slots per pole per phase; a is the largest integer less than q; z is calculated by formula (2): z=2P(q-a) (2) The number of basic winding units is represented by t, where t is the greatest common divisor of z and P; the number of basic winding units t represents that the motor winding is divided into t groups of windings that are repeated in form.

7. The 10K slot double-layer winding five-phase AC motor according to claim 5, characterized in that: Based on the number of basic winding units, the number of slots per basic winding unit and the number of poles per basic winding unit are calculated, including: Based on the number of basic winding units, the number of slots in each basic winding unit is calculated using formula (3): Where, t is the number of basic winding units; N t is the number of slots for each basic winding unit; Based on the number of basic winding units, the number of pole pairs of each basic winding unit is calculated using formula (4): Where P is the number of pole pairs of the motor rotor, P is equal to 5K±1 or 5K±2; P t The number of pole pairs for each basic winding unit.

8. The 10K slot double-layer winding five-phase AC motor according to claim 7, characterized in that: Fill in the stator slot numbers in the table, including the following steps: Step 1: Fill slot 1 in the first row and first column of the table, that is, (1,1); then in each basic winding unit, from left to right and from top to bottom, fill in the next slot number across P t Then fill the new cell with the i-th slot in iP t +1; when the rightmost cell of each row under the current basic winding unit is filled, start filling from a new row under the current basic winding unit; fill all the stator slot numbers into the table cells in the order of filling one basic winding unit first and then the next basic winding unit; if a cell has been filled with other slot numbers, fill it in the nearest empty cell in sequence; Step 2: Divide the cells under each basic winding unit in the table into left and right halves. The left half is Column, the right half is Column; among them, Indicates that the value of Nt / 10 is rounded up; keep the left half unchanged, and move the rows of the right half upward by two rows as a whole, that is, the first row of the right half moves to the fourth row, the second row moves to the fifth row, the third row moves to the first row, the fourth row moves to the second row, and the fifth row moves to the third row; after the movement, the number of each stator slot is multiplied by -1, indicating that the coil side in the stator slot generates a reverse potential, and the coil side in the stator slot is the coil side; Step 3: Form a five-phase motor winding arrangement table; determine the slot number of each phase winding of the motor and the direction of the coil edge in the slot based on the data in each row of the table.

9. The 10K slot double-layer winding five-phase AC motor according to claim 8, characterized in that: The numbers in the five-phase motor winding arrangement table represent the stator slot number where the coil side of each coil is located, and the motor phase number to which the coil side belongs; In the five-phase motor winding arrangement table, the coil side in the stator slot in the first row belongs to the coil of phase A of the five-phase motor, and a positive slot number represents that the back electromotive force is positive, and a negative slot number represents that the back electromotive force is negative; the coil side in the stator slot in the second row of the table belongs to the coil of phase B of the five-phase motor; the coil side in the stator slot in the third row belongs to phase C; the coil side in the stator slot in the fourth row belongs to phase D; and the coil side in the stator slot in the fifth row belongs to phase E.

10. The 10K-slot double-layer winding five-phase AC motor according to claim 8, if a centralized winding solution is adopted, the numbers of each stator slot in the five-phase motor winding arrangement table are all tooth numbers of the wound teeth.

Images