Method and device for generating permanent magnet motor winding with flat wires of any layer number, storage medium and flat wire winding

Abstract

The invention relates to a method and device for generating a winding of a flat wire permanent magnet motor with any layer number, a storage medium and a flat wire winding, and the method comprises the steps: S1, importing design parameters which comprise the stator slot number Q, the pole pair number p, the parallel branch number b and the slot number q of each pole and each phase of the motor; s2, designing to obtain a basic connection unit; s3, designing to obtain a special connection unit for connecting the basic connection units to form a primary branch based on the basic connection units; s4, judging whether the number b of parallel branches of the motor is 1 or not, if yes, connecting all primary branches in series, and if not, executing the step S5; s5, judging whether the stator slot number Q of the motor reaches 2 or not, if yes, connecting all primary branches in parallel, and otherwise, executing the step S6; and S6, changing the pitch of a special connecting coil in the winding layout, and selecting and adjusting the positions of the wire inlet end and the wire outlet end and the rotating direction of a parallel branch. Compared with the prior art, the invention has the advantages of adapting to different pole slot matching and coil pitches, reducing the manufacturing difficulty and cost and the like.

Description

Technical Field

[0001] The present invention relates to, in particular to, a method, a device, a storage medium and a flat wire winding for generating a flat wire permanent magnet motor with an arbitrary number of layers. Background Art

[0002] Compared with traditional gasoline and diesel vehicles, electric vehicles have obvious advantages in environmental protection and energy conservation and emission reduction. As the core of the electric vehicle drive system, the performance of the drive motor is directly related to the endurance and operational reliability of the electric vehicle. In recent years, flat wire technology has been increasingly used in permanent magnet motors for electric vehicles because it can significantly improve the power density of the motor. Compared with traditional round wire windings, flat wire windings can significantly increase the slot fill rate, thereby reducing the copper loss of the motor. In addition, the flat wire winding has a low end height and a compact structure, so it can effectively reduce the size and weight of the motor and improve the torque density.

[0003] As electric vehicle drive motors gradually develop towards high speed, the increase in AC copper loss in flat wire windings will seriously affect the efficiency and reliability of the motor. In order to reduce AC copper loss, 4-layer, 6-layer, 8-layer and even 10-layer flat wire winding designs have appeared in recent years. However, the increase in the number of flat wire layers will inevitably increase the complexity of its production and manufacturing. In addition, although new flat wire winding topologies such as Litz wire winding, segmented conductor and hybrid flat wire winding can effectively reduce AC copper loss, their manufacturing processes are complex and difficult to achieve mass production. The design method of flat wire winding is different from that of traditional round wire winding because of its diverse connection methods. When designing flat wire windings, not only should the classical AC winding theory be met, but also the impedance balance of each branch should be considered. The existing flat wire winding design method is limited to even-layer windings, and its basic connection unit is a double-layer wave winding form. Jumpers with different pitches and same-layer connection coils are required to connect each basic connection unit, which undoubtedly increases the manufacturing cost. In addition, the even-layer flat wire winding design method increases the difficulty of matching the torque-speed curve with the DC bus voltage, which is not conducive to serial production design. Although the design of odd-number-layer flat wire windings has emerged in recent years, it is limited to the combination of 5-layer flat wire windings and 8-pole 48-slot motors. Therefore, it is of great significance to explore the general design method of flat wire windings with any number of layers under different pole slot combinations and coil pitches. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device, storage medium and flat wire winding for generating a flat wire permanent magnet motor winding with any number of layers.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A method for generating a flat-wire permanent magnet motor winding with an arbitrary number of layers, comprising:

[0007] Step S1: importing design parameters, wherein the design parameters include the number of stator slots Q, the number of pole pairs p, the number of parallel branches b, and the number of slots per pole per phase q of the motor;

[0008] Step S2: according to the design parameters, determine the circumferential rotation mode of the flat wire winding, the number of slots and layers occupied by the basic connection unit, and the coil pitch of the basic connection unit, and design the basic connection unit;

[0009] Step S3: Based on the basic connection unit, with the goal of covering all slots and layers, a special connection unit is designed to connect the basic connection units to form an elementary branch;

[0010] Step S4: determine whether the number b of parallel branches of the motor is 1, if yes, connect all elementary branches in series, otherwise, execute step S5;

[0011] Step S5: determine whether the number of stator slots Q of the motor reaches 2, if yes, connect all elementary branches in parallel, otherwise, execute step S6;

[0012] Step S6: changing the pitch of the special connection coil in the winding layout to achieve phase-changing connection, and at the same time, adjusting the position of the incoming and outgoing terminals and the rotation direction of the parallel branches to avoid crossing.

[0013] The flat wire coils in the basic connection unit are connected in sequence in all layers, and the directions are reversed at the top and bottom layers by connecting coils on the same layer. The basic connection units all start and end at the same layer.

[0014] The coil pitch of the basic connection unit obtained in step S2 is an integral pitch:

[0015] τ=Q / 2p

[0016] Where: τ is the coil pitch.

[0017] The special connection unit includes a jumper and a same-layer connection coil, and the pitches of the special connection coils obtained in step S3 are all full pitches:

[0018] τ=Q / 2p

[0019] Where: τ is the coil pitch.

[0020] In the step S4, a plurality of primary branches are connected in series using the end winding busbar.

[0021] In step S6, the phase-changing connection between the parallel branches is realized by the following method: the pitch of the special connection coil is changed from full pitch to long pitch or short pitch alternately.

[0022] The number of winding layers is set to an even number or an odd number.

[0023] A flat wire winding is produced by the method as described above.

[0024] A device for generating windings of a flat-wire permanent magnet motor with an arbitrary number of layers comprises a memory, a processor, and a program stored in the memory, wherein the processor implements the above-mentioned method when executing the program.

[0025] A storage medium stores a program, which implements the above method when executed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The winding can be designed with any number of layers, which has a high degree of design freedom and is conducive to reducing the difficulty of matching the torque-speed curve with the DC bus voltage.

[0028] 2. It can adapt to different pole slot combinations and coil pitches, reducing the demand for coils with different pitches, thereby reducing manufacturing difficulty and cost, and making it easy to implement serialized production design. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the technical route of the present invention;

[0030] Figure 2 A schematic diagram of the method provided by the present invention;

[0031] Figure 3 The schematic diagram of the traditional even-layer flat wire winding design method;

[0032] Figure 4 This is a schematic diagram of a connection of a 6-layer flat wire winding according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a connection of a 7-layer flat wire winding according to an embodiment of the present invention;

[0034] Figure 6 This is a connection diagram of a 6-layer flat wire winding under the traditional even-number-layer flat wire winding design method;

[0035] Figure 7 This is a schematic diagram of the crown side and welding side structure of a 6-layer flat wire winding end in an embodiment of the present invention;

[0036] Figure 8 The present invention is a schematic diagram of the crown side and welding side structure of a 7-layer flat wire winding end.

[0037] Fig. 9 The figure is a schematic flow chart of the main steps of the method of the present invention. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0039] A method for generating a flat-wire permanent magnet motor winding with an arbitrary number of layers, such as Figure 1 and Fig. 9 As shown, including:

[0040] Step S1: importing design parameters, wherein the design parameters include the number of stator slots Q, the number of pole pairs p, the number of parallel branches b, and the number of slots per pole per phase q of the motor;

[0041] The above design parameters are determined according to the design requirements and will not be described in detail because they belong to the prior art.

[0042] Step S2: according to the design parameters, determine the circumferential rotation mode of the flat wire winding, the number of slots and layers occupied by the basic connection unit, and the coil pitch of the basic connection unit, and design the basic connection unit;

[0043] like Figure 2 As shown, the flat wire coils in the basic connection unit are connected sequentially in all layers, and the direction is reversed by connecting coils on the same layer at the top and bottom layers. The basic connection units all start and end on the same layer. Obviously, this design of the basic connection unit can be used for both even-numbered layer windings and odd-numbered layer windings. Figure 2 In the figure, the solid line represents the connection on the crown side of the flat wire winding end, and the dotted line represents the connection on the welding side; the numbers in square brackets represent the coil pitch.

[0044] To reduce the manufacturing difficulty, the conventional coil pitch in the basic connection unit can be designed to be an integral pitch:

[0045] τ=Q / 2p

[0046] Where: τ is the coil pitch.

[0047] The pitch of the coils connected on the same layer can be designed to be full pitch, long pitch or short pitch.

[0048] In contrast, Figure 3 It can be seen that the basic connection unit in the traditional even-layer flat wire winding design method is a double-layer wave winding form, and the flat wire coil rotates up and down in the basic connection unit. Since the basic connection unit only occupies 2 layers of winding, this method cannot be used for the design of odd-layer windings.

[0049] Step S3: Based on the basic connection unit, with the goal of covering all slots and layers, a special connection unit is designed to connect the basic connection units to form an elementary branch;

[0050] The special connection units include jumpers and same-layer connection coils. The pitches of the special connection coils obtained in step S3 are all full pitches:

[0051] τ=Q / 2p

[0052] Where: τ is the coil pitch.

[0053] Step S4: determine whether the number b of parallel branches of the motor is 1, if yes, connect all elementary branches in series, otherwise, execute step S5;

[0054] When b = 1, the parallel branch of the motor contains only one elementary branch, which is composed of several basic connection units in series. Figure 2 As shown in the figure, each basic connection unit in the arbitrary layer flat wire winding design method only covers part of the stator slots. The same layer connection coils should be used to connect different basic connection units to cover all the stator slots of the motor. The pitch of the same layer connection coils can be designed to be full pitch. In contrast, the basic connection unit in the traditional even-layer flat wire winding design method only covers 2 layers, so jumpers are needed to connect basic connection units of different layers, such as Figure 3 shown.

[0055] When b=1 and q=1, the design method of any layer of flat wire winding only includes one elementary branch, while the traditional design method of even-numbered layers of flat wire winding still includes two elementary branches. At this time, these two elementary branches should be connected in series through the same-layer connecting coils; if there are multiple elementary branches in the motor, that is, b=1 and q≥2, the end winding busbar should be used to connect all elementary branches in series.

[0056] Step S5: determine whether the number of stator slots Q of the motor reaches 2, if yes, connect all elementary branches in parallel, otherwise, execute step S6;

[0057] When b≥2, there are multiple parallel branches in the motor, which are formed by connecting several elementary branches in parallel. In order to ensure the voltage distribution balance between the parallel branches, the phase-changing connection can be achieved by changing the pitch of the special connection coil (jumper or same-layer connection). In the arbitrary-layer flat wire winding design method, since the same-layer connection coils are always located at the top and bottom layers, it is only necessary to change the pitch of the same-layer connection coils from full pitch to long pitch or short pitch alternately, that is, τ=Q / 2p±1, while the pitch of other conventional coils remains full pitch, so that the phase-changing connection between the parallel branches can be easily achieved. For the traditional even-layer flat wire winding design method, the phase-changing connection can be achieved by adjusting the jumper pitch. At the same time, reasonable input and output terminal positions and parallel branch rotation directions should be selected to avoid crossing.

[0058] Step S6: changing the pitch of the special connection coil in the winding layout to achieve phase-changing connection, and at the same time, adjusting the position of the incoming and outgoing terminals and the rotation direction of the parallel branches to avoid crossing.

[0059] By changing the pitch of the conventional coil alternately to long or short along the layer direction, the full-pitch winding can be adjusted to a short-pitch winding, thereby effectively suppressing the back electromotive force harmonics and torque pulsation of the motor.

[0060] The specific implementation of a method for designing a flat wire permanent magnet motor winding with an arbitrary number of layers of the present invention is described below in combination with specific embodiments and drawings.

[0061] like Figure 4 , Figure 5 As shown, the embodiment of the present invention takes an 8-pole 48-slot permanent magnet motor with q=2 and b=2 as an example, and designs 6-layer and 7-layer flat wire winding layouts respectively. In order to achieve phase-changing connection and avoid crossing, the two parallel branches of the flat wire winding rotate in opposite directions along the circumference of the motor respectively. Most conventional coils are full pitch, that is, τ=Q / 2p=6, while the coils connected on the same layer are long or short pitch, that is, τ=Q / 2p±1, thereby achieving phase-changing connection between parallel branches. All special connection coils are located on the top and bottom layers, and the coil pitches of the top and bottom layers are 5 or 7 respectively. At this time, the number of coil types required does not increase compared to when b=1. In contrast, in the traditional even-layer flat wire winding design method, the pitch of the special connection coils changes alternately in different layers, such as Figure 6 As shown, the number of coil types required at this time will double compared to when b=1, and the manufacturing cost will also increase accordingly.

[0062] Figure 7 and Figure 8 The schematic diagrams are the structural diagrams of the crown side and welding side of the 6-layer and 7-layer flat wire winding ends, respectively. The inlet and outlet ends of the winding are both located on the welding side. Figure 7 , Figure 8 As shown, the 6-layer and 7-layer flat wire windings have similar topological structures, which is conducive to the realization of serial production design.

[0063] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

Claims

1. A method for generating a flat wire permanent magnet motor winding with any number of layers, characterized in that: include: Step S1: importing design parameters, wherein the design parameters include the number of stator slots Q, the number of pole pairs p, the number of parallel branches b, and the number of slots per pole per phase q of the motor; Step S2: according to the design parameters, determine the circumferential rotation mode of the flat wire winding, the number of slots and layers occupied by the basic connection unit, and the coil pitch of the basic connection unit, and design the basic connection unit; Step S3: Based on the basic connection unit, with the goal of covering all slots and layers, a special connection unit is designed to connect the basic connection units to form an elementary branch; Step S4: determine whether the number b of parallel branches of the motor is 1, if yes, connect all elementary branches in series, otherwise, execute step S5; Step S5: determine whether the number of stator slots Q of the motor reaches 2, if yes, connect all elementary branches in parallel, otherwise, execute step S6; Step S6: changing the pitch of the special connection coil in the winding layout to achieve phase-changing connection, and at the same time, adjusting the position of the incoming and outgoing terminals and the rotation direction of the parallel branches to avoid crossing.

2. A method for generating a flat wire permanent magnet motor winding with any number of layers according to claim 1, characterized in that: The flat wire coils in the basic connection unit are connected in sequence in all layers, and the directions are reversed in the top layer and the bottom layer through the same layer connection coils, and the basic connection units all start and end in the same layer.

3. A method for generating a flat wire permanent magnet motor winding with any number of layers according to claim 2, characterized in that: The coil pitch of the basic connection unit obtained in step S2 is an integral pitch: τ=Q / 2p Where: τ is the coil pitch.

4. The method for generating a flat wire permanent magnet motor winding with any number of layers according to claim 1, characterized in that: The special connection unit includes a jumper and a same-layer connection coil, and the pitches of the special connection coils obtained in step S3 are all full pitches: τ=Q / 2p Where: τ is the coil pitch.

5. The method for generating a flat wire permanent magnet motor winding with any number of layers according to claim 1, characterized in that: In the step S4, a plurality of primary branches are connected in series using the end winding busbar.

6. The method for generating a flat wire permanent magnet motor winding with any number of layers according to claim 1, characterized in that: In step S6, the phase-changing connection between the parallel branches is realized by the following method: the pitch of the special connection coil is changed from full pitch to long pitch or short pitch alternately.

7. The method for generating a flat-wire permanent magnet motor winding with any number of layers according to claim 1, characterized in that: The number of winding layers is set to an even number or an odd number.

8. A flat wire winding, characterized in that: Generated by the method according to any one of claims 1 to 7.

9. A device for generating a flat-wire permanent magnet motor winding with any number of layers, comprising a memory, a processor, and a program stored in the memory, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A storage medium having a program stored thereon, characterized in that: When the program is executed, the method according to any one of claims 1 to 7 is implemented.

Images