Coil winding wiring structure, connection and disconnection method and three-phase motor

Abstract

The invention provides a coil winding wiring structure, a wiring method and a three-phase motor, and relates to the technical field of motors, the coil winding wiring structure comprises double-layer windings arranged in 72 stator slots of the motor, the double-layer windings comprise an A-phase winding, a B-phase winding and a C-phase winding, and the A-phase winding, the B-phase winding and the C-phase winding are combined in a variable pitch combination mode of 1-10, 1-13 and 1-14. Four-path parallel winding wiring of a 72-slot 6-pole three-phase motor is realized, the limitation of the number of parallel branches in the traditional design is broken through, and the use requirement of a high-performance motor can be met; moreover, each phase of coil is distributed in a stator slot according to a specified pitch, and the number of coils of each pitch is ensured to be consistent among each phase, so that the balance of three-phase resistance is ensured, the slot current can be improved, the distribution uniformity of an internal magnetic field of the motor can be improved, the harmonic distortion rate can be reduced, and the service life of the motor can be prolonged. And the efficiency and the stability of the motor in the operation process are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a coil winding connection structure, a wire connection method and a three-phase electric motor. Background Art

[0002] In the traditional 72-slot 6-pole three-phase motor, a double-layer winding connection method with a fixed pitch is usually adopted. Among them, the number of conventional parallel branches of the stator winding needs to be designed as a divisor of the number of motor poles, that is, the number of parallel branches is 2, 3 and 6, to meet the output power requirements of the motor.

[0003] However, in special demand scenarios, the 72-slot, 6-pole three-phase motor with conventional parallel connections has problems with low slot current and high harmonic distortion rate, resulting in poor generator power generation efficiency and difficulty in meeting the actual usage needs of users. Summary of the invention

[0004] The problem solved by the invention is how to increase the slot current of a 72-slot 6-pole three-phase motor and reduce the harmonic distortion rate.

[0005] In order to solve the above problems, the present invention provides a coil winding connection structure, a connection method and a three-phase motor.

[0006] In a first aspect, the present invention provides a coil winding connection structure, comprising a double-layer winding arranged in 72 stator slots of a motor, the double-layer winding comprising an A-phase winding, a B-phase winding and a C-phase winding, the A-phase winding comprising a first branch, a second branch, a third branch and a fourth branch, the B-phase winding comprising a fifth branch, a sixth branch, a seventh branch and an eighth branch, and the C-phase winding comprising a ninth branch, a tenth branch, an eleventh branch and a twelfth branch;

[0007] The first branch includes the 1st, 25th, 51st, 3rd, 27th, and 52nd coils connected in sequence, the second branch includes the 16th, 40th, 62nd, 14th, 38th, and 63rd coils connected in sequence, the third branch includes the 2nd, 26th, 50th, 4th, 28th, and 49th coils connected in sequence, the fourth branch includes the 13th, 37th, 61st, 15th, 39th, and 64th coils connected in sequence, the fifth branch includes the 9th, 33rd, 59th, 11th, 35th, and 60th coils connected in sequence, the sixth branch includes the 24th, 48th, 71st, and 81st coils connected in sequence 0, 22, 46, and 71 coils, the seventh branch includes the 10th, 34th, 58th, 12th, 36th, and 57th coils, the eighth branch includes the 21st, 45th, 69th, 23rd, 47th, and 72nd coils, the ninth branch includes the 5th, 29th, 55th, 7th, 31st, and 56th coils, the tenth branch includes the 20th, 44th, 66th, 18th, 42nd, and 67th coils, the eleventh branch includes the 6th, 30th, 54th, 8th, 32nd, and 53rd coils, and the twelfth branch includes the 17th, 41st, 65th, 19th, 43rd, and 68th coils.

[0008] Optionally, the 1st coil, the 16th coil, the 2nd coil and the 13th coil are connected, the 52nd coil, the 63rd coil, the 49th coil and the 64th coil are connected, the 5th coil, the 20th coil, the 6th coil and the 17th coil are connected, the 56th coil, the 67th coil, the 53rd coil and the 68th coil are connected, the 9th coil, the 24th coil, the 10th coil and the 21st coil are connected, and the 60th coil, the 71st coil, the 57th coil and the 72nd coil are connected.

[0009] Optionally, six coils are arranged in each parallel branch of the A-phase winding, the B-phase winding and the C-phase winding.

[0010] Optionally, the rated frequency of the motor winding coil is one of 50 Hz and 60 Hz.

[0011] Optionally, an insulating unit is further included, and the insulating unit is arranged between effective sides of different coils of the stator slot.

[0012] In a second aspect, the present invention further provides a method for connecting a wire, which is used for any one of the motor coil winding structures, comprising:

[0013] Winding the coil of the motor coil winding structure;

[0014] embedding the 72 coils into 72 stator slots of the motor;

[0015] Respectively connect the first branch, the second branch, the third branch and the fourth branch of the A-phase winding of the motor coil winding structure, respectively connect the fifth branch, the sixth branch, the seventh branch and the eighth branch of the B-phase winding of the motor coil winding structure, respectively connect the ninth branch, the tenth branch, the eleventh branch and the twelfth branch of the C-phase winding of the motor coil winding structure;

[0016] The first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch are connected.

[0017] Optionally, the wiring of the first branch of the A-phase winding of the motor coil winding structure includes:

[0018] Connect the 1st, 25th, 51st, 3rd, 27th and 52nd coils in series in sequence;

[0019] The wiring of the second branch of the A-phase winding of the motor coil winding structure includes:

[0020] Connect the 16th, 40th, 62nd, 14th, 38th and 63rd coils in series in sequence;

[0021] The wiring of the third branch of the A-phase winding of the motor coil winding structure includes:

[0022] Connect the 2nd, 26th, 50th, 4th, 28th and 49th coils in series in sequence;

[0023] The wiring of the fourth branch of the A-phase winding of the motor coil winding structure includes:

[0024] The 13th, 37th, 61st, 15th, 39th and 64th coils are connected in series in sequence;

[0025] The wiring of the fifth branch of the B-phase winding of the motor coil winding structure includes:

[0026] Connect the 9th, 33rd, 59th, 11th, 35th and 60th coils in series in sequence;

[0027] The wiring of the sixth branch of the B-phase winding of the motor coil winding structure includes:

[0028] The 24th, 48th, 70th, 22nd, 46th and 71st coils are connected in series in sequence;

[0029] The wiring of the seventh branch of the B-phase winding of the motor coil winding structure includes:

[0030] Connect the 10th, 34th, 58th, 12th, 36th and 57th coils in series in sequence;

[0031] The wiring of the eighth branch of the B-phase winding of the motor coil winding structure includes:

[0032] The 21st, 45th, 69th, 23rd, 47th and 72nd coils are connected in series in sequence;

[0033] The wiring of the ninth branch of the C-phase winding of the motor coil winding structure comprises:

[0034] Connect the 5th, 29th, 55th, 7th, 31st and 56th coils in series in sequence;

[0035] The wiring of the tenth branch of the C-phase winding of the motor coil winding structure includes:

[0036] The 20th, 44th, 66th, 18th, 42nd and 67th coils are connected in series in sequence;

[0037] The wiring of the eleventh branch of the C-phase winding of the motor coil winding structure comprises:

[0038] Connect the 6th, 30th, 54th, 8th, 32nd and 53rd coils in series in sequence;

[0039] The wiring of the twelfth branch of the C-phase winding of the motor coil winding structure includes:

[0040] The 17th, 41st, 65th, 19th, 43rd and 68th coils are connected in series in sequence.

[0041] Optionally, the connecting the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch comprises:

[0042] Connecting one end of the first branch with one end of the second branch, the third branch, and the fourth branch, and connecting the other end of the first branch with the other ends of the second branch, the third branch, and the fourth branch;

[0043] Connecting one end of the fifth branch to one end of the sixth branch, the seventh branch, and the eighth branch, and connecting the other end of the fifth branch to the other ends of the sixth branch, the seventh branch, and the eighth branch;

[0044] One end of the ninth branch is connected to one end of the tenth branch, the eleventh branch, and the twelfth branch, and the other end of the ninth branch is connected to the other ends of the tenth branch, the eleventh branch, and the twelfth branch.

[0045] Optionally, the connecting the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch further comprises:

[0046] The first coil, the sixteenth coil, the second coil and the thirteenth coil are connected, the fifty-second coil, the sixty-third coil, the forty-ninth coil and the sixty-fourth coil are connected, the fifth coil, the twentieth coil, the sixth coil and the seventeenth coil are connected, the fifty-sixth coil, the sixty-seventh coil, the fifty-third coil and the sixty-eighth coil are connected, the ninth coil, the twenty-fourth coil, the tenth coil and the twenty-first coil are connected, and the sixty-second coil, the seventy-first coil, the fifty-seventh coil and the seventy-second coil are connected.

[0047] In a third aspect, the present invention provides a three-phase motor, comprising any one of the motor coil winding structures described.

[0048] Compared with the prior art, the present invention has the following beneficial effects: the coil winding connection structure is applied to a 72-slot 6-pole three-phase motor, and a 4-way parallel winding connection of a 72-slot 6-pole three-phase motor is realized through a combination of 1-10, 1-13, and 1-14 variable pitches, breaking through the limitation of the number of parallel branches in the traditional design and being able to meet the use requirements of high-performance motors; furthermore, each phase coil is distributed in the stator slots according to a specified pitch, and the number of coils of each pitch is kept consistent between the phases to ensure the balance of the three-phase resistance, which can improve the distribution uniformity of the magnetic field inside the motor while increasing the slot current, reduce the harmonic distortion rate, and thus improve the efficiency and stability of the motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic structural diagram of a coil winding connection structure according to an embodiment of the present invention;

[0050] Figure 2 The figure is a flow chart of a method for connecting a line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0053] Generally, the number of parallel branches of the motor stator winding needs to follow the motor-related design manual. For a single-layer winding with a 60° phase belt, when the number of slots per pole per phase is an even number, the maximum number of parallel branches is 2P, where P represents the number of motor pole pairs. When the number of slots per pole per phase is an odd number, the maximum number of parallel branches is P. For a double-layer winding with a 60° phase belt, when the number of slots per pole per phase is an integer, the maximum number of parallel branches is 2P; when the number of slots per pole per phase is a fraction, the maximum number of parallel branches is 2P / d, where d represents the denominator of the fraction. In actual use, the number of parallel branches of the motor is a divisor of the maximum number of parallel branches. That is, for a 6-pole three-phase motor with a double-layer winding connection method, the conventional number of parallel branches of its stator winding is 2, 3, and 6. However, in special demand scenarios, the 72-slot, 6-pole three-phase motor with conventional parallel connections has problems with low slot current and high harmonic distortion rate, resulting in poor generator power generation efficiency and difficulty in meeting the actual usage needs of users.

[0054] Reference Figure 1 In order to solve the above technical problems, an embodiment of the present invention provides a coil winding connection structure, including a double-layer winding arranged in 72 stator slots of a motor, the double-layer winding including an A-phase winding, a B-phase winding and a C-phase winding, the A-phase winding including a first branch, a second branch, a third branch and a fourth branch, the B-phase winding including a fifth branch, a sixth branch, a seventh branch and an eighth branch, and the C-phase winding including a ninth branch, a tenth branch, an eleventh branch and a twelfth branch;

[0055] The first branch includes the 1st, 25th, 51st, 3rd, 27th, and 52nd coils connected in sequence, the second branch includes the 16th, 40th, 62nd, 14th, 38th, and 63rd coils connected in sequence, the third branch includes the 2nd, 26th, 50th, 4th, 28th, and 49th coils connected in sequence, the fourth branch includes the 13th, 37th, 61st, 15th, 39th, and 64th coils connected in sequence, the fifth branch includes the 9th, 33rd, 59th, 11th, 35th, and 60th coils connected in sequence, the sixth branch includes the 24th, 48th, 71st, and 81st coils connected in sequence 0, 22, 46, and 71 coils, the seventh branch includes the 10th, 34th, 58th, 12th, 36th, and 57th coils, the eighth branch includes the 21st, 45th, 69th, 23rd, 47th, and 72nd coils, the ninth branch includes the 5th, 29th, 55th, 7th, 31st, and 56th coils, the tenth branch includes the 20th, 44th, 66th, 18th, 42nd, and 67th coils, the eleventh branch includes the 6th, 30th, 54th, 8th, 32nd, and 53rd coils, and the twelfth branch includes the 17th, 41st, 65th, 19th, 43rd, and 68th coils.

[0056] It needs to be explained that the embodiment of the present invention arranges the slot positions and wiring for a double-layer winding motor with 72 stator slots, 6 poles and three phases, through a combination of 1-10, 1-13, and 1-14 variable pitches, that is, the two effective sides of a coil are embedded in an interval of 10 slots, 13 slots or 14 slots, so as to maximize the space utilization of the motor and efficiently use the magnetic field, and subdivide each phase winding of the three-phase A, B, and C into 4 parallel branches, thereby achieving the balance of the three-phase circuit, which can improve the operating efficiency and stability of the motor while reducing the harmonic distortion rate, and reduce the loss of the motor.

[0057] The specific positions of the 72 stator slots of the winding are set, and the 72 stator slots are defined as the first slot, the second slot...the seventy-second slot in a clockwise and then counterclockwise direction, and the first slot and the seventy-second slot are adjacent. The 72 coils are set in the 72 stator slots in the order of the stator slot numbers from small to large to complete the arrangement of the 72 coils in the 72 stator slots. In the motor coil winding structure, each phase winding is provided with 24 coils, each phase leads to 8 outlets, and the entire winding leads to 24 outlets in total. Through the series-parallel connection of the winding outlets, the triangle connection or star connection of the three-phase winding can be realized.

[0058] The upper and lower coils in the double-layer winding in this embodiment are connected by straight-parallel head sleeves, oblique-parallel head sleeves and short copper rings to form coils with three different pitches. The coils in each branch are alternately distributed in the upper and lower layers of the 72 stator slots, connected in series to form four branches, and connected in parallel at the ends to complete the winding structure.

[0059] Furthermore, the 72 stator slots, 6-pole, 3-phase double-layer winding motor adopts a triangle connection to obtain a larger current output, which is suitable for application scenarios that require a higher starting torque. At the same voltage, the triangle connection has a higher output power than the star connection; while the 72 stator slots, 6-pole, 3-phase double-layer winding motor adopts a triangle connection to provide a higher operating voltage, and at the same output power, the star connection has a lower operating current, and can use thinner cables and smaller switchgear, thus reducing the cost of the equipment. The specific connection method can be flexibly set according to the actual situation, and no specific restrictions are made here.

[0060] In one embodiment, the 1st coil, the 16th coil, the 2nd coil and the 13th coil are connected, the 52nd coil, the 63rd coil, the 49th coil and the 64th coil are connected, the 5th coil, the 20th coil, the 6th coil and the 17th coil are connected, the 56th coil, the 67th coil, the 53rd coil and the 68th coil are connected, the 9th coil, the 24th coil, the 10th coil and the 21st coil are connected, and the 60th coil, the 71st coil, the 57th coil and the 72nd coil are connected.

[0061] Through the wiring arrangement of the above embodiment, different coils can be connected in a specific manner. On the one hand, it can ensure that the current is evenly distributed in the winding, thereby avoiding local overheating and reducing the operating loss of the motor; on the other hand, it can reduce the harmonic distortion of the motor and improve the operating efficiency of the motor.

[0062] In one embodiment, six coils are arranged in each parallel branch of the A-phase winding, the B-phase winding, and the C-phase winding.

[0063] Specifically, in the 72 stator slots, 6-pole, 3-phase double-layer winding motor, 6 coils are arranged in each parallel branch of each phase winding. By evenly distributing the 6 coils of each winding group on the stator, the motor can generate a balanced rotating magnetic field and achieve balanced operation of the motor. Compared with the 4-pole motor, the 6-pole motor has a lower synchronous speed and can be effectively used in low-speed, high-torque application scenarios.

[0064] In one embodiment, the rated frequency of the motor winding coil is one of 50 Hz and 60 Hz.

[0065] By setting the rated frequency of the motor winding coil to one of 50 Hz and 60 Hz, efficient operation of the motor is ensured. In actual use scenarios, the rated frequency of the motor winding coil may also be other unconventional frequencies, which are not specifically limited here.

[0066] In one embodiment, an insulating unit is further included, and the insulating unit is arranged between effective sides of different coils of the stator slot.

[0067] Specifically, the insulating unit is arranged between the effective sides of different coils in the stator slots, and is used to electrically isolate the coils, thereby preventing problems such as leakage and short circuit between different coils; and when in a high-voltage working environment, the rated voltage difference between different coils may cause breakdown, and the insulating unit can improve the insulation strength in the stator slot; furthermore, the insulating unit can also reduce the electromagnetic energy and electromagnetic interference between the coils, and improve the stability of the electromagnetic performance of the motor.

[0068] Reference Figure 2 The embodiment of the present invention further provides a method for connecting a wire, which is used for any of the motor coil winding structures described above, comprising:

[0069] S11, winding the coil of the motor coil winding structure.

[0070] S12, embedding the 72 coils into 72 stator slots of the motor;

[0071] S13, respectively connecting the first branch, the second branch, the third branch and the fourth branch of the A-phase winding of the motor coil winding structure, respectively connecting the fifth branch, the sixth branch, the seventh branch and the eighth branch of the B-phase winding of the motor coil winding structure, respectively connecting the ninth branch, the tenth branch, the eleventh branch and the twelfth branch of the C-phase winding of the motor coil winding structure;

[0072] S14, connecting the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch.

[0073] Specifically, in order to ensure the controllability during the coil manufacturing process and facilitate the testing and maintenance of the coil, in step S11, the stator coil is wound in advance, that is, the pre-wound stator coil is embedded in the 72 stator slots of the motor stator, and the wiring of the coils in the branches of phase A, phase B and phase C is respectively carried out through step S13, and finally the wiring between the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch is realized through S14. Among them, the wiring between the branches can be star wiring or delta wiring, which can be flexibly set according to actual needs.

[0074] In one embodiment, the wiring of the first branch of the A-phase winding of the motor coil winding structure includes:

[0075] Connect the 1st, 25th, 51st, 3rd, 27th and 52nd coils in series in sequence;

[0076] The wiring of the second branch of the A-phase winding of the motor coil winding structure includes:

[0077] Connect the 16th, 40th, 62nd, 14th, 38th and 63rd coils in series in sequence;

[0078] The wiring of the third branch of the A-phase winding of the motor coil winding structure includes:

[0079] Connect the 2nd, 26th, 50th, 4th, 28th and 49th coils in series in sequence;

[0080] The wiring of the fourth branch of the A-phase winding of the motor coil winding structure includes:

[0081] The 13th, 37th, 61st, 15th, 39th and 64th coils are connected in series in sequence;

[0082] The wiring of the fifth branch of the B-phase winding of the motor coil winding structure includes:

[0083] Connect the 9th, 33rd, 59th, 11th, 35th and 60th coils in series in sequence;

[0084] The wiring of the sixth branch of the B-phase winding of the motor coil winding structure includes:

[0085] The 24th, 48th, 70th, 22nd, 46th and 71st coils are connected in series in sequence;

[0086] The wiring of the seventh branch of the B-phase winding of the motor coil winding structure includes:

[0087] Connect the 10th, 34th, 58th, 12th, 36th and 57th coils in series in sequence;

[0088] The wiring of the eighth branch of the B-phase winding of the motor coil winding structure includes:

[0089] The 21st, 45th, 69th, 23rd, 47th and 72nd coils are connected in series in sequence;

[0090] The wiring of the ninth branch of the C-phase winding of the motor coil winding structure comprises:

[0091] Connect the 5th, 29th, 55th, 7th, 31st and 56th coils in series in sequence;

[0092] The wiring of the tenth branch of the C-phase winding of the motor coil winding structure includes:

[0093] The 20th, 44th, 66th, 18th, 42nd and 67th coils are connected in series in sequence;

[0094] The wiring of the eleventh branch of the C-phase winding of the motor coil winding structure comprises:

[0095] Connect the 6th, 30th, 54th, 8th, 32nd and 53rd coils in series in sequence;

[0096] The wiring of the twelfth branch of the C-phase winding of the motor coil winding structure includes:

[0097] The 17th, 41st, 65th, 19th, 43rd and 68th coils are connected in series in sequence.

[0098] Specifically, in step S13, the coils in the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch are respectively connected in series to obtain the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch that meet the requirements.

[0099] In one embodiment, the connecting of the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch comprises:

[0100] Connecting one end of the first branch with one end of the second branch, the third branch, and the fourth branch, and connecting the other end of the first branch with the other ends of the second branch, the third branch, and the fourth branch;

[0101] Connecting one end of the fifth branch to one end of the sixth branch, the seventh branch, and the eighth branch, and connecting the other end of the fifth branch to the other ends of the sixth branch, the seventh branch, and the eighth branch;

[0102] One end of the ninth branch is connected to one end of the tenth branch, the eleventh branch, and the twelfth branch, and the other end of the ninth branch is connected to the other ends of the tenth branch, the eleventh branch, and the twelfth branch.

[0103] Specifically, through the connection method of step S14, the first branch, the second branch, the third branch and the fourth branch in phase A form a parallel structure, the fifth branch, the sixth branch, the seventh branch and the eighth branch in phase B form a parallel structure, and the ninth branch, the tenth branch, the eleventh branch and the twelfth branch in phase C form a parallel structure. By connecting multiple branches of each phase winding in parallel, it can ensure that the current is evenly distributed in each branch when the motor is running, thereby increasing the slot current of the motor. Moreover, connecting each phase branch in parallel can improve the overall conductivity of the winding and reduce the current burden of a single winding; in addition, such a connection method can maintain the symmetry of the winding, help to balance the distribution of the motor, reduce local heating, and thus extend the service life of the motor.

[0104] In one embodiment, the connecting the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch further comprises:

[0105] The first coil, the sixteenth coil, the second coil and the thirteenth coil are connected, the fifty-second coil, the sixty-third coil, the forty-ninth coil and the sixty-fourth coil are connected, the fifth coil, the twentieth coil, the sixth coil and the seventeenth coil are connected, the fifty-sixth coil, the sixty-seventh coil, the fifty-third coil and the sixty-eighth coil are connected, the ninth coil, the twenty-fourth coil, the tenth coil and the twenty-first coil are connected, and the sixty-second coil, the seventy-first coil, the fifty-seventh coil and the seventy-second coil are connected.

[0106] Specifically, the above embodiments describe the connection method between coils of different winding branches, which can enhance the symmetry and uniformity of the winding and effectively balance the electromagnetic field of the motor; and the evenly distributed electromagnetic field reduces the vibration and noise during the operation of the motor, which helps to improve the operating stability of the motor.

[0107] The present invention also provides a three-phase motor, comprising any one of the motor coil winding structures described above.

[0108] In this embodiment, the 72-slot 6-pole three-phase motor adopts the above-mentioned motor coil winding structure and utilizes the combination of 1-10, 1-13, and 1-14 variable pitches to achieve 4-way parallel winding connection of the 72-slot 6-pole three-phase motor, breaking through the limitation of the number of parallel branches in the traditional design, thereby meeting the use requirements of high-performance motors; furthermore, each phase coil is distributed in the stator slots according to the specified pitch, and the number of coils of each pitch is ensured to be consistent between the phases to ensure the balance of the three-phase resistance, which can improve the distribution uniformity of the magnetic field inside the motor while increasing the slot current, reduce the harmonic distortion rate, and thus improve the efficiency and stability of the motor during operation.

[0109] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0110] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A coil winding connection structure, characterized in that: A double-layer winding including 72 stator slots of the motor, the double-layer winding including an A-phase winding, a B-phase winding and a C-phase winding, the A-phase winding including a first branch, a second branch, a third branch and a fourth branch, the B-phase winding including a fifth branch, a sixth branch, a seventh branch and an eighth branch, and the C-phase winding including a ninth branch, a tenth branch, an eleventh branch and a twelfth branch; The first branch includes the 1st, 25th, 51st, 3rd, 27th, and 52nd coils connected in sequence, the second branch includes the 16th, 40th, 62nd, 14th, 38th, and 63rd coils connected in sequence, the third branch includes the 2nd, 26th, 50th, 4th, 28th, and 49th coils connected in sequence, the fourth branch includes the 13th, 37th, 61st, 15th, 39th, and 64th coils connected in sequence, the fifth branch includes the 9th, 33rd, 59th, 11th, 35th, and 60th coils connected in sequence, the sixth branch includes the 24th, 48th, 71st, and 81st coils connected in sequence 0, 22, 46, and 71 coils, the seventh branch includes the 10th, 34th, 58th, 12th, 36th, and 57th coils, the eighth branch includes the 21st, 45th, 69th, 23rd, 47th, and 72nd coils, the ninth branch includes the 5th, 29th, 55th, 7th, 31st, and 56th coils, the tenth branch includes the 20th, 44th, 66th, 18th, 42nd, and 67th coils, the eleventh branch includes the 6th, 30th, 54th, 8th, 32nd, and 53rd coils, and the twelfth branch includes the 17th, 41st, 65th, 19th, 43rd, and 68th coils.

2. The coil winding connection structure according to claim 1, characterized in that: The 1st coil, the 16th coil, the 2nd coil and the 13th coil are connected, the 52nd coil, the 63rd coil, the 49th coil and the 64th coil are connected, the 5th coil, the 20th coil, the 6th coil and the 17th coil are connected, the 56th coil, the 67th coil, the 53rd coil and the 68th coil are connected, the 9th coil, the 24th coil, the 10th coil and the 21st coil are connected, and the 60th coil, the 71st coil, the 57th coil and the 72nd coil are connected.

3. The coil winding connection structure according to claim 1, characterized in that: Six coils are arranged in each parallel branch of the A-phase winding, the B-phase winding and the C-phase winding.

4. The coil winding connection structure according to claim 1, characterized in that: The rated frequency of the motor winding coil is one of 50 Hz and 60 Hz.

5. The coil winding connection structure according to claim 1, characterized in that: An insulating unit is also included, and the insulating unit is arranged between effective sides of different coils of the stator slot.

6. A method for connecting a wire, used for the motor coil winding structure according to any one of claims 1 to 5, characterized in that: include: Winding the coil of the motor coil winding structure; embedding the 72 coils into 72 stator slots of the motor; Respectively connect the first branch, the second branch, the third branch and the fourth branch of the A-phase winding of the motor coil winding structure, respectively connect the fifth branch, the sixth branch, the seventh branch and the eighth branch of the B-phase winding of the motor coil winding structure, respectively connect the ninth branch, the tenth branch, the eleventh branch and the twelfth branch of the C-phase winding of the motor coil winding structure; The first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch are connected.

7. The method for connecting the line according to claim 6, characterized in that: The wiring of the first branch of the A-phase winding of the motor coil winding structure includes: Connect the 1st, 25th, 51st, 3rd, 27th and 52nd coils in series in sequence; The wiring of the second branch of the A-phase winding of the motor coil winding structure includes: Connect the 16th, 40th, 62nd, 14th, 38th and 63rd coils in series in sequence; The wiring of the third branch of the A-phase winding of the motor coil winding structure includes: Connect the 2nd, 26th, 50th, 4th, 28th and 49th coils in series in sequence; The wiring of the fourth branch of the A-phase winding of the motor coil winding structure includes: The 13th, 37th, 61st, 15th, 39th and 64th coils are connected in series in sequence; The wiring of the fifth branch of the B-phase winding of the motor coil winding structure includes: Connect the 9th, 33rd, 59th, 11th, 35th and 60th coils in series in sequence; The wiring of the sixth branch of the B-phase winding of the motor coil winding structure includes: The 24th, 48th, 70th, 22nd, 46th and 71st coils are connected in series in sequence; The wiring of the seventh branch of the B-phase winding of the motor coil winding structure includes: Connect the 10th, 34th, 58th, 12th, 36th and 57th coils in series in sequence; The wiring of the eighth branch of the B-phase winding of the motor coil winding structure includes: The 21st, 45th, 69th, 23rd, 47th and 72nd coils are connected in series in sequence; The wiring of the ninth branch of the C-phase winding of the motor coil winding structure comprises: Connect the 5th, 29th, 55th, 7th, 31st and 56th coils in series in sequence; The wiring of the tenth branch of the C-phase winding of the motor coil winding structure includes: The 20th, 44th, 66th, 18th, 42nd and 67th coils are connected in series in sequence; The wiring of the eleventh branch of the C-phase winding of the motor coil winding structure comprises: Connect the 6th, 30th, 54th, 8th, 32nd and 53rd coils in series in sequence; The wiring of the twelfth branch of the C-phase winding of the motor coil winding structure includes: The 17th, 41st, 65th, 19th, 43rd and 68th coils are connected in series in sequence.

8. The method for connecting a line according to claim 6, characterized in that: The connecting of the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch comprises: Connecting one end of the first branch with one end of the second branch, the third branch, and the fourth branch, and connecting the other end of the first branch with the other ends of the second branch, the third branch, and the fourth branch; Connecting one end of the fifth branch to one end of the sixth branch, the seventh branch, and the eighth branch, and connecting the other end of the fifth branch to the other ends of the sixth branch, the seventh branch, and the eighth branch; One end of the ninth branch is connected to one end of the tenth branch, the eleventh branch, and the twelfth branch, and the other end of the ninth branch is connected to the other ends of the tenth branch, the eleventh branch, and the twelfth branch.

9. The method for connecting a line according to claim 8, characterized in that: The connecting of the first branch, the second branch, the third branch, the fourth branch, the fifth branch, the sixth branch, the seventh branch, the eighth branch, the ninth branch, the tenth branch, the eleventh branch and the twelfth branch further includes: The first coil, the sixteenth coil, the second coil and the thirteenth coil are connected, the fifty-second coil, the sixty-third coil, the forty-ninth coil and the sixty-fourth coil are connected, the fifth coil, the twentieth coil, the sixth coil and the seventeenth coil are connected, the fifty-sixth coil, the sixty-seventh coil, the fifty-third coil and the sixty-eighth coil are connected, the ninth coil, the twenty-fourth coil, the tenth coil and the twenty-first coil are connected, and the sixty-second coil, the seventy-first coil, the fifty-seventh coil and the seventy-second coil are connected.

10. A three-phase motor, characterized in that: The invention comprises a motor coil winding structure as claimed in any one of claims 1 to 5.

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