Design method of alternating current winding capable of generating multipolar magnetomotive force

Abstract

The invention belongs to the related technical field of motor winding design, and discloses a design method of an alternating current winding capable of generating multipolar magnetomotive force, which comprises the following steps of: selecting n three-phase symmetrical winding units according to n required magnetomotive forces and determining the number of fundamental wave pole pairs, performing star connection on three-phase windings in each three-phase symmetrical winding unit, the same-phase windings of the n three-phase symmetrical winding units are connected in series to form a winding assembly, and star connection is kept; according to the fundamental wave pole pair number of each three-phase symmetric winding unit, determining the arrangement of the corresponding three-phase symmetric winding unit in the iron core slot, and obtaining the initial arrangement of the winding assembly in the slot; and based on the equal ampere-turn principle of the alternating current winding, combining and simplifying the winding coil conductor in each slot to obtain the final arrangement of the winding assembly in the slots. An alternating current winding is designed based on the method, useless harmonic components can be suppressed, and various principal wave magnetomotive forces with any number of pole pairs and any turning direction can be generated.

Description

Technical Field

[0001] The present invention belongs to the technical field related to the design of motor windings, and more specifically, relates to a design method for an alternating current winding capable of generating a multi-pole magnetomotive force. Background Art

[0002] The new special motor technology is widely used in important industrial fields such as new energy, aerospace, and high-end equipment manufacturing. The alternating current winding is the core component for realizing the electro-mechanical energy conversion in the motor, known as the "heart" of the motor, and directly affects key indicators such as the efficiency, power factor, and power density of the motor. Currently, a series of new motor topologies represented by the magnetic field modulation motor have emerged continuously, not only expanding the application scenarios of the motor, but also enriching the theoretical system of electromechanics. The magnetic field modulation motor breaks through the limitation of the traditional motor that only relies on a magnetic field with one pole-pair to generate electromagnetic torque. It can utilize the main wave magnetic fields with multiple pole-pairs to work together to generate multiple main wave working magnetic fields, thereby promising to fully explore the potential of the motor torque density.

[0003] In order to meet the needs of new special motors represented by the magnetic field modulation motor for multiple main wave magnetic fields, the existing design techniques generally change the air-gap permeance through magnetic circuit editing of the magnetic field, so as to generate multiple main wave working magnetic fields simultaneously. However, this approach will also generate a series of low-order harmonic magnetic fields while generating other multiple main wave magnetic fields, resulting in the decline of indicators such as the power factor and efficiency of the motor, which is not conducive to the popularization and application of new special motors. Summary of the Invention

[0004] Aiming at the above-mentioned defects or improvement requirements of the existing technology, the present invention provides a design method for an alternating current winding capable of generating a multi-pole magnetomotive force, aiming to generate main wave magnetic fields with multiple pole-pairs without changing the air-gap permeance, and at the same time suppressing the generation of useless harmonics, so as to provide a technical approach for the multi-main wave collaborative working requirements of new special motors.

[0005] To achieve the above object, according to the first aspect of the present invention, a design method for an alternating current winding capable of generating a multi-pole magnetomotive force is provided, which includes:

[0006] Select n three-phase symmetric winding units according to the required n magnetomotive forces, n≥2. The i-th three-phase symmetric winding unit is used to generate the i-th magnetomotive force. The fundamental pole-pairs of the n three-phase symmetric winding units are respectively designed as the fundamental pole-pairs corresponding to the required n magnetomotive forces. Among them, the three-phase windings in each three-phase symmetric winding unit are connected in star, and the same-phase windings of the n three-phase symmetric winding units are connected in series to form a winding assembly and remain connected in star;

[0007] Determine the arrangement of each three-phase symmetrical winding unit in the stator core slots or rotor core slots according to the fundamental pole pairs of each three-phase symmetrical winding unit, and obtain the initial arrangement of the winding assembly in the slots;

[0008] Based on the equal ampere-turn principle of the AC winding, merge and simplify the winding coil conductors in each slot. If the sum of the magnetomotive forces of multiple winding coil conductors in a slot is zero, delete the winding coil conductors with the sum of magnetomotive forces equal to zero from the corresponding slot. If the sum of the magnetomotive forces of two winding coil conductors in a slot is equal to the magnetomotive force of one winding coil conductor, replace the two winding coil conductors with an equivalent single winding coil conductor. After merging and simplifying each slot, obtain the final arrangement of the winding assembly in the slots.

[0009] Optionally, the method further includes designing the phase sequence arrangement of each of the three-phase symmetrical winding units according to the rotation direction of the magnetomotive force: taking any one of the three-phase symmetrical winding units as a reference winding, defining the rotation direction of its magnetomotive force as the positive direction. If the rotation directions of the magnetomotive forces of any other three-phase symmetrical winding units are the same as the positive direction, make the spatial three-phase phase sequence arrangement of its three-phase symmetrical winding unit the same as that of the reference winding. If the rotation direction of the magnetomotive force of any other winding is the opposite direction, make the spatial three-phase phase sequence arrangement of its winding opposite to that of the reference winding.

[0010] Optionally, independently design the number of turns, pitch, and number of layers of the coils of each three-phase symmetrical winding unit to optimize its magnetomotive force harmonic content and fundamental winding factor.

[0011] Optionally, the three-phase symmetrical winding unit adopts a regular winding or an irregular winding.

[0012] Optionally, the core slot is an integral slot structure or a fractional slot structure; when it is an integral slot structure, the number of slots is a positive integer multiple of 6 times the least common multiple of the fundamental pole pairs of each of the three-phase symmetrical winding units. When it is a fractional slot structure, for each of the three-phase symmetrical winding units, the denominator of the number of slots per pole per phase should not be 3 or a multiple of 3.

[0013] Optionally, each of the three-phase symmetrical winding units adopts a double-layer short-pitch winding or a single-layer full-pitch winding or a double-layer full-pitch winding.

[0014] According to the second aspect of the present invention, there is provided an electronic device, including a memory and a processor, where the memory stores a computer program, and wherein when the processor executes the computer program, the steps of the design method described in any one of the above are implemented.

[0015] According to the third aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, and wherein when the computer program is executed by a processor, the steps of the design method described in any one of the above are implemented.

[0016] According to a fourth aspect of the present invention, there is provided a computer program product, including a computer program or instructions, wherein when the computer program or instructions are executed by a processor, the steps of the design method described in any one of the above are implemented.

[0017] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the present invention mainly has the following beneficial effects:

[0018] The present invention first selects a corresponding number of three-phase symmetric winding units according to the required number of magnetomotive forces, and the same-phase windings of all three-phase symmetric winding units are connected in series to form a winding assembly, so as to ensure that the currents of the same-phase windings are the same, which is convenient for subsequent merging and simplification, and the winding assembly remains in a star connection, so that the three-phase currents of the simplified winding remain symmetric; the distributions of the corresponding three-phase symmetric winding units in the iron core slots are determined respectively according to the required magnetomotive forces to obtain an initial arrangement. Although each winding unit can independently achieve the corresponding magnetomotive force, in the scenario where multiple magnetomotive forces need to be generated, there is an interaction between multiple winding units, and finally it is almost impossible to achieve the required multiple magnetomotive forces. Therefore, the present invention further optimizes the initial arrangement. Specifically, by merging and simplifying the winding coil conductors in each slot, while ensuring that the magnetomotive force in the slot remains unchanged, the number of conductors is reduced to obtain a simplified distribution as the final arrangement of the winding in the slot. It is found that by designing the AC winding based on the above method, the useless harmonic components can be suppressed, and multiple main wave magnetomotive forces with any number of pole pairs and any rotation direction can be generated. According to the working mode and operation requirements of the new special motor, the air-gap magnetic field can be flexibly edited, providing a technical approach for the multi-main wave collaborative working requirements of the new special motor. Description of the Drawings

[0019] Figure 1 is a flowchart of the steps of the AC winding design method in an embodiment of the present invention;

[0020] Figure 2 is a connection schematic diagram of three three-phase symmetric winding units with pole pairs p1 = 1, p2 = 3, and p3 = 5 respectively in an embodiment of the present invention;

[0021] Fig. 3(a) is a three-phase slot number phase distribution diagram of the first winding unit with p1 = 1 in Embodiment 1;

[0022] Fig. 3(b) is a three-phase slot number phase distribution diagram of the second winding unit with p2 = 3 and the magnetomotive force rotation direction the same as that of the first winding unit in Embodiment 1;

[0023] Fig. 3(c) is a three-phase slot number phase distribution diagram of the third winding unit with p3 = 5 and the magnetomotive force rotation direction the same as that of the first winding unit in Embodiment 1;

[0024] Figure 4 It is a schematic diagram of the conductor combination and simplification in slot No. 10 during the design process of an AC winding that can simultaneously generate fundamental magnetomotive forces with 1 pole pair, 3 pole pairs, and 5 pole pairs, and the rotation directions of the fundamental magnetomotive forces of the three winding units are the same.

[0025] Figure 5 It is a wiring diagram of an AC winding in Embodiment 1 that can simultaneously generate fundamental magnetomotive forces with 1 pole pair, 3 pole pairs, and 5 pole pairs, and the rotation directions of the three fundamental magnetomotive forces are the same.

[0026] Figure 6(a) is a three-phase slot number phase distribution diagram of the first winding unit with p1 = 1 in Embodiment 2.

[0027] Figure 6(b) is a three-phase slot number phase distribution diagram of the second winding unit with p2 = 3 and the rotation direction of the magnetomotive force opposite to that of the first winding unit in Embodiment 2.

[0028] Figure 6(c) is a three-phase slot number phase distribution diagram of the third winding unit with p3 = 5 and the rotation direction of the magnetomotive force opposite to that of the first winding unit in Embodiment 2.

[0029] Figure 7 It is a schematic diagram of the conductor combination and simplification in slot No. 9 during the design process of an AC winding that can simultaneously generate fundamental magnetomotive forces with 1 pole pair, 3 pole pairs, and 5 pole pairs, and the rotation directions of the fundamental magnetomotive forces with 3 pole pairs and 5 pole pairs are both opposite to that of the fundamental magnetomotive force with 1 pole pair.

[0030] Figure 8 It is a wiring diagram of an AC winding in Embodiment 2 that can simultaneously generate fundamental magnetomotive forces with 1 pole pair, 3 pole pairs, and 5 pole pairs, and the rotation directions of the fundamental magnetomotive forces with 3 pole pairs and 5 pole pairs are both opposite to that of the fundamental magnetomotive force with 1 pole pair. Detailed implementation manners

[0031] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The present invention provides a design method for an AC winding capable of generating a multi-pole magnetomotive force. As Figure 1 shown in the flowchart of the steps of the AC winding design method in an embodiment of the present invention, the steps are described in detail below.

[0033] S1. Select n three-phase symmetric winding units according to the required n magnetomotive forces. The i-th three-phase symmetric winding unit is used to generate the i-th magnetomotive force. The fundamental pole pairs of the n three-phase symmetric winding units are respectively designed as the fundamental pole pairs corresponding to the required n magnetomotive forces. Among them, the three-phase windings in each three-phase symmetric winding unit are star-connected, and the windings of the same phase of the n three-phase symmetric winding units are connected in series to form a winding assembly, and the star connection is maintained.

[0034] Specifically, first clarify the number and magnetic field parameters of the required main wave magnetic fields. Assume that n main wave magnetic fields need to be generated, then there are corresponding n magnetomotive forces. In the present invention, n three-phase symmetric winding units are correspondingly selected. The i-th three-phase symmetric winding unit is used to generate the i-th magnetomotive force. The n three-phase symmetric winding units correspondingly generate n magnetomotive forces, and the fundamental pole pairs of each three-phase symmetric winding unit are determined according to the required magnetomotive force.

[0035] For example, the fundamental pole pairs of the n three-phase symmetric winding units are respectively denoted as p1, p2, p3, ……, p n , where p i is the fundamental pole pair of the i-th three-phase symmetric winding unit, and the fundamental pole pair p i is determined by the i-th magnetomotive force.

[0036] Specifically, the three-phase symmetric winding unit can be a regular winding with 60° phase belts or other non-regular windings. The coil turns, pitches, and layers of each winding unit can be independently designed by referring to the traditional AC winding design method, and indicators such as the harmonic content of the magnetomotive force and the fundamental winding coefficient are optimized. Specifically, in order to reduce the harmonic magnetomotive force generated by the winding, the first to the third winding units all adopt double-layer short-pitch windings. In other embodiments, single-layer full-pitch windings or double-layer full-pitch windings can also be used.

[0037] As Figure 2 shown is a connection diagram of three three-phase symmetric winding units with fundamental pole pairs p1 = 1, p2 = 3, and p3 = 5 in an embodiment of the present invention. The way of star-connecting the three-phase windings in a single three-phase symmetric winding unit is not shown. The A-phase windings of the 3 three-phase symmetric winding units are connected in series to form the A-phase of the winding assembly, the B-phase windings of the 3 three-phase symmetric winding units are connected in series to form the B-phase of the winding assembly, and the C-phase windings of the 3 three-phase symmetric winding units are connected in series to form the C-phase of the winding assembly. Connecting the windings of the same phase of different units in series can ensure that the three-phase currents of the finally designed winding remain symmetric, and the winding assembly remains star-connected. The windings of each phase of all three-phase symmetric winding units are wired according to the above rules.

[0038] S2. Determine the arrangement of each three-phase symmetrical winding unit in the stator core slots or rotor core slots according to the fundamental pole pairs of each three-phase symmetrical winding unit, and obtain the initial arrangement of the winding assembly in the slots.

[0039] Specifically, place each three-phase symmetrical winding unit in different slots of the stator or rotor core, and arrange them according to the magnetomotive force they need to generate to form a slot number phase diagram of the corresponding three-phase symmetrical winding unit. Among them, the three-phase windings in each three-phase symmetrical winding unit are star-connected, and the same-phase windings of n three-phase symmetrical winding units are connected in series to form a winding assembly. The winding assembly remains star-connected to obtain the initial arrangement of the winding assembly in the slots.

[0040] In one embodiment, the core slots are of integral slot structure, and the number of slots is a positive integer multiple of 6 times the least common multiple of the fundamental pole pairs of each three-phase symmetrical winding unit. For example, if the pole pairs of 3 three-phase symmetrical winding units are p1 = 1, p2 = 3, and p3 = 5 respectively, then 6 times the least common multiple of the fundamental pole pairs is 15 * 6 = 90, and the number of slots Z of the core slots should be a positive integer multiple of 90.

[0041] In another embodiment, the core slots can also be of fractional slot structure. For each of the three-phase symmetrical winding units, the denominator of the number of slots per pole per phase should not be 3 or a multiple of 3.

[0042] In the present invention, the phase sequence arrangement of each winding unit can also be designed according to the rotation direction of the magnetomotive force. If the rotation direction of the magnetomotive force of any one of the winding units is taken as the positive direction, if the spatial three-phase phase sequence arrangement of the remaining windings is the same as it, then the rotation direction of its magnetomotive force is also the positive direction. If the phase sequence is opposite to it, then the rotation direction of its rotating magnetomotive force is the reverse direction. Thus, the rotation direction of the magnetomotive force generated by different winding units can be controlled.

[0043] S3. Based on the equal ampere-turn principle of the AC winding, merge and simplify the winding coil conductors in each slot. If the sum of the magnetomotive forces of multiple winding coil conductors in a slot is zero, then delete the winding coil conductors with the sum of magnetomotive forces being zero from the corresponding slot. If the sum of the magnetomotive forces of two winding coil conductors in a slot is equal to the magnetomotive force of one winding coil conductor, then replace the two winding coil conductors with an equivalent one winding coil conductor. After merging and simplifying each slot, obtain the final arrangement of the winding assembly in the slots.

[0044] Specifically, when determining the arrangement scheme of each winding unit and star-connecting each winding unit to obtain the initial arrangement of the winding assembly in the slots, based on the equal ampere-turn principle of the AC winding, the coil conductors of different winding units in each slot are combined and simplified. While changing the conductor distribution structure and connection method, the ampere-turns (the product of current and number of turns) of the modified winding and the original winding in one slot are kept equal to ensure the equivalence of its magnetomotive force characteristics and present a new function of being able to generate magnetomotive forces with multiple different pole numbers simultaneously, effectively improving the conductor utilization rate.

[0045] The following is an illustration with a specific example.

[0046] Embodiment 1

[0047] Provide an AC winding that can simultaneously generate fundamental magnetomotive forces with 1 pole pair, 3 pole pairs, and 5 pole pairs, and the three fundamental magnetomotive forces have the same rotation direction. The specific design steps are as follows.

[0048] 1) First, take three three-phase symmetric winding units with pole pairs p1 = 1, p2 = 3, and p3 = 5 respectively, which are the 1st to 3rd winding units. Adopt the integer slot and regular 60° phase belt arrangement scheme, and take the number of core slots Z as 90. To reduce the harmonic magnetomotive forces generated by the winding, the windings of the 1st to 3rd winding units all adopt double-layer short-pitch windings. Then, the coil pitch of the 1-pole-pair winding is taken as 36, the coil pitch of the 3-pole-pair winding is taken as 12, and the coil pitch of the 5-pole-pair winding is taken as 7. The number of conductors per layer of the 1st to 3rd winding units in the slot is set to N turns. Each three-phase symmetric winding unit needs to be star-connected, and the windings of the same phase of different three-phase symmetric winding units are connected in series to ensure the symmetry of the three-phase current of the finally designed winding.

[0049] 2) Second, arrange the arrangement scheme of the 1-pole-pair winding unit. As shown in Fig. 3(a), take the rotation direction of the magnetomotive force of the 1-pole-pair winding as positive. Then, to make the rotation directions of the magnetomotive forces of the 3-pole-pair winding unit and the 5-pole-pair winding unit both positive, it is necessary to ensure that the space phase sequence of the 3-pole-pair winding unit and the 5-pole-pair winding unit is the same as that of the 1-pole-pair winding unit. Thus, arrange the arrangement schemes of the 3-pole-pair winding unit and the 5-pole-pair winding, as shown in Fig. 3(b) and Fig. 3(c) respectively.

[0050] 3) Finally, based on the equal ampere-turn principle of the AC winding, combine and simplify the different conductors in the slot. Taking slot No. 10 as an example, the comparison schematic diagrams before and after simplification are as Figure 4 shown, where (a) is the schematic diagram before simplification of slot No. 10, and (b) is the schematic diagram after simplification of slot No. 10. In the figure, +Ni A , -Ni C , +Ni B , -Ni C , -Ni A, -Ni A , where the "+" and "-" respectively represent the current flow direction in the slot. Here, the current flowing into the paper surface is positive, and the current flowing out of the paper surface is negative. N represents the number of turns of a single layer of the conductor, and i A , i B and i C are the currents in the corresponding conductors respectively. For slot No. 10, the magnetomotive force generated by the conductor with +Ni A cancels out the magnetomotive force generated by the conductor with -Ni A , and the sum magnetic field intensity generated by the two is zero, which can be equivalently replaced by no conductor current; since i A + i B + i C = 0, so the magnetomotive force synthesized by the conductor with conductor current -Ni C and the conductor with conductor current -Ni A is equivalent to the magnetomotive force generated by the conductor with conductor current +Ni B . Finally, the magnetomotive force generated by all the conductor currents in slot No. 10 can be equivalently the superposition of the magnetomotive forces generated by the conductors with +Ni B , +Ni B and -Ni C . That is, in slot No. 10, it is only necessary to ensure that there are conductors with +i B and the total number of turns is 2N, and there are also conductors with -i C and the total number of turns is N. After processing the conductors in all the remaining slots in turn according to the above principle, a wiring diagram of a three-phase symmetrical winding containing fundamental wave rotating magnetomotive forces with 1, 3, and 5 pairs of poles and the same rotating direction of the magnetomotive force can be finally generated as shown in Figure 5 . Among them, the first input terminal represents the current i A of phase A, the second input terminal represents the current i B of phase B, the third input terminal represents the current i C of phase C. The wiring corresponding to slot No. 10 in the figure includes 10 (2N) and 10 (1N) , indicating that slot No. 10 has conductors with the forward-phase B current i B flowing through and the total number of turns of this conductor is 2N, and conductors with the reverse-phase C current i C flowing through and the total number of turns of this conductor is N. The final arrangement obtained clarifies the conductor current and its flow direction in each slot and the number of turns of each conductor.

[0051] In this example, the analysis results of the fundamental wave and harmonic content of the magnetomotive force of the new AC winding are shown in Table 1 as follows: the winding coefficient of the fundamental wave component with 1 pair of poles is 0.6387, the winding coefficient of the fundamental wave component with 3 pairs of poles is 0.6397, and the winding coefficient of the fundamental wave component with 5 pairs of poles is 0.6342. The winding coefficients of the three main waves are high, while the harmonic winding coefficients are low. The winding has both high conductor utilization rate and low harmonic content, achieving the generation of main wave magnetic fields with multiple pole pairs without changing the air-gap permeance, and at the same time suppressing the generation of useless harmonics.

[0052] Table 1 Analysis Results of the Magnetomotive Force of the Winding in Example 1

[0053]

[0054] Example 2

[0055] Provide an AC winding that can simultaneously generate fundamental magnetomotive forces with 1 pair of poles, 3 pairs of poles, and 5 pairs of poles, and the rotation directions of the fundamental magnetomotive forces with 3 pairs of poles and 5 pairs of poles are both opposite to the rotation direction of the fundamental magnetomotive force with 1 pair of poles. The specific design steps are as follows.

[0056] 1) First, take three three-phase symmetrical winding units with pole numbers p1 = 1, p2 = 3, and p3 = 5 respectively, which are the 1st to 3rd winding units. Adopt the integer-slot and regular 60° phase-band arrangement scheme, and take the number of slots Z in the iron core as 90. In order to reduce the harmonic magnetomotive force generated by the winding, the windings of the 1st to 3rd winding units all adopt double-layer short-pitch windings. Then, the coil pitch of the 1-pair-pole winding is taken as 36, the coil pitch of the 3-pair-pole winding is taken as 12, and the coil pitch of the 5-pair-pole winding is taken as 7. The number of conductors per layer in the slot of the 1st to 3rd winding units is set to N turns. Each three-phase symmetrical winding unit needs to be star-connected, and the windings of the same phase of different three-phase symmetrical winding units are connected in series to ensure the symmetry of the three-phase current of the finally designed winding.

[0057] 2) Secondly, arrange the layout scheme of the 1-pair-pole winding unit. As shown in Figure 6(a), take the rotation direction of the magnetomotive force of the 1-pair-pole winding as positive. Then, in order to make the rotation directions of the magnetomotive forces of the 3-pair-pole winding unit and the 5-pair-pole winding unit both positive, it is necessary to ensure that the spatial phase sequence of the 3-pair-pole winding unit and the 5-pair-pole winding unit is the same as that of the 1-pair-pole winding unit. Thus, the layout schemes of the 3-pair-pole winding unit and the 5-pair-pole winding are arranged, as shown in Figure 6(b) and Figure 6(c) respectively.

[0058] 3) Finally, based on the equal-ampere-turn principle of the AC winding, the conductors of different units in the slot are combined and simplified. The comparison schematic diagrams of slot No. 9 before and after simplification are as Figure 7 shown, where Figure (a) is the schematic diagram before the simplification of slot No. 9, and (b) is the schematic diagram after the simplification of slot No. 9. In the figure, +Ni A 、-Ni C, +Ni B , -Ni C , -Ni A , -Ni A , where the "+" and "-" respectively represent the current flow direction in the slot, with the current flowing into the paper surface being positive and the current flowing out of the paper surface being negative, N represents the number of turns of a single layer of the conductor, and i A , i B and i C are the currents in the corresponding conductors respectively. For slot No. 9, since i A + i B + i C = 0, the magnetomotive force generated by the conductor with a conductor current of -Ni C and the conductor with a conductor current of -Ni B is equivalent to the magnetomotive force generated by the conductor with a conductor current of +Ni A after synthesis. Finally, the magnetomotive force generated by all the conductor currents in slot No. 9 can be equivalent to the superposition of the magnetomotive forces generated by the conductors with conductor currents of +Ni A , +Ni A , +Ni A , +Ni A and -Ni C , that is, in slot No. 9, it is only necessary to ensure that there are conductors with +i A and their total number of turns is 4N, and there are also conductors with -i C and their total number of turns is N. After processing the conductors in all the remaining slots in turn according to the above principle, a wiring diagram of a three-phase symmetrical winding that can finally generate fundamental wave rotating magnetomotive forces with 1, 3, and 5 pairs of poles and the rotating directions of the fundamental wave magnetomotive forces with 3 and 5 pairs of poles are both opposite to the rotating direction of the fundamental wave magnetomotive force with 1 pair of poles is as shown in Figure 8 , where the first input terminal represents the A-phase current i A , the second input terminal represents the B-phase current i B , the third input terminal represents the C-phase current i C , and the wiring corresponding to slot No. 9 in the figure includes 9 (4N) and 9 (1N) , indicating that slot No. 9 has conductors with a forward A-phase current i A and the total number of turns of this conductor is 4N, and conductors with a reverse C-phase current i C and the total number of turns of this conductor is N. The resulting final arrangement clarifies the conductor current and its flow direction in each slot and the number of turns of each conductor.

[0059] In this example, the analysis results of the fundamental wave and harmonic content of the magnetomotive force of the new AC winding are shown in Table 2, where: the winding coefficient of the fundamental wave component with 1 pair of poles is 0.5757, the winding coefficient of the fundamental wave component with 3 pairs of poles is 0.5767, and the winding coefficient of the fundamental wave component with 5 pairs of poles is 0. ...

[0060] Table 2 Analysis Results of the Winding Magnetomotive Force in Example 2

[0061]

[0062] In summary, based on the AC winding designed in the present invention, useless harmonic components can be suppressed, and multiple fundamental wave magnetomotive forces with arbitrary pole pairs and arbitrary rotation directions can be generated. The air-gap magnetic field can be flexibly edited according to the working mode and operation requirements of the new special motor, providing a technical approach for the multi-fundamental wave collaborative working requirements of the new special motor.

[0063] The present invention also relates to an electronic device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0064] The electronic device can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The so-called processor can be a Central Processing Unit (CPU), or other general processors, Digital Signal Processors (DSPs), Application-Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The memory can be used to store computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory, various functions of the electronic device can be realized.

[0065] The present invention also relates to a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0066] Specifically, the memory may include a high-speed random access memory, and may also include non-volatile memories, such as hard disks, internal memories, plug-in hard disks, smart media cards (SMCs), secure digital (SD) cards, flash cards, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

[0067] An embodiment of the present invention provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the steps of the method in the above embodiments of the present invention.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification. It should be noted that the "in an embodiment of the present invention", "for example", "again, for example", etc. in the present invention are intended to illustrate the present invention, rather than to limit the present invention.

[0069] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An AC winding design method capable of generating multi-pole magnetomotive force, characterized in that, Including: Select n three-phase symmetrical winding units according to the required n magnetomotive forces, where n≥2. The i-th three-phase symmetrical winding unit is used to generate the i-th magnetomotive force. The fundamental pole pairs of the n three-phase symmetrical winding units are respectively designed as the fundamental pole pairs corresponding to the required n magnetomotive forces. Among them, the three-phase windings in each three-phase symmetrical winding unit are star-connected, and the same-phase windings of the n three-phase symmetrical winding units are connected in series to form a winding assembly and remain star-connected; Determine the arrangement of each three-phase symmetrical winding unit in the stator core slots or rotor core slots according to the fundamental pole pairs of each three-phase symmetrical winding unit to obtain the initial arrangement of the winding assembly in the slots; Based on the equal ampere-turn principle of the AC winding, merge and simplify the winding coil conductors in each slot. If the sum of the magnetomotive forces of multiple winding coil conductors in the slot is zero, delete the winding coil conductors with the sum of magnetomotive forces being zero from the corresponding slot. If the sum of the magnetomotive forces of two winding coil conductors in the slot is equal to the magnetomotive force of one winding coil conductor, replace the two winding coil conductors with an equivalent single winding coil conductor. After merging and simplifying each slot, obtain the final arrangement of the winding assembly in the slots.

2. The AC winding design method according to claim 1, characterized in that The method further includes designing the phase sequence arrangement of each three-phase symmetrical winding unit according to the rotation direction of the magnetomotive force: taking any one of the three-phase symmetrical winding units as the reference winding, defining the rotation direction of its magnetomotive force as the positive direction. If the rotation directions of the magnetomotive forces of the remaining any three-phase symmetrical winding units are also the positive direction, make the spatial three-phase phase sequence arrangement of its three-phase symmetrical winding unit the same as that of the reference winding. If the rotation direction of the magnetomotive force of the remaining any winding is the reverse direction, make the spatial three-phase phase sequence arrangement of its winding opposite to that of the reference winding.

3. The AC winding design method according to claim 1, characterized in that, Independently design the number of turns, pitch, and number of layers of the coils of each three-phase symmetrical winding unit to optimize its magnetomotive force harmonic content and fundamental winding coefficient.

4. The AC winding design method according to claim 1, characterized in that The three-phase symmetrical winding unit adopts a regular winding or an irregular winding.

5. The AC winding design method according to claim 1, wherein The core slots are of integral slot structure or fractional slot structure; when it is of integral slot structure, the number of slots is a positive integer multiple of 6 times the least common multiple of the fundamental pole pairs of each three-phase symmetrical winding unit. When it is of fractional slot structure, for each three-phase symmetrical winding unit, the denominator of the number of slots per pole per phase should not be 3 or a multiple of 3.

6. The AC winding design method according to claim 1, wherein, Each three-phase symmetrical winding unit adopts a double-layer short-pitch winding or a single-layer full-pitch winding or a double-layer full-pitch winding.

7. An electronic device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the design method described in any one of claims 1 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the design method described in any one of claims 1 to 6.

9. A computer program product comprising a computer program or instructions, characterized in that, When the computer program or instruction is executed by the processor, it implements the steps of the design method described in any one of claims 1 to 6.

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