Low-short-circuit current motor stator winding design method and system and medium

Abstract

The invention discloses a low-short-circuit current motor stator winding design method and system and a medium, and the method comprises the following steps: obtaining all feasible stator winding slot position distribution and arrangement schemes based on the slot number Z, the pole pair number p and the phase number m of a motor stator, and enabling the coil turn number and the parallel branch number Pa of each phase stator winding to be consistent; all feasible stator winding slot position distribution and arrangement schemes, the number of turns of coils of stator windings and the number of parallel branches Pa are used as optimization variables, and short-circuit current peak value characteristic minimization and winding copper consumption minimization of all phases are used as optimization targets. And searching an optimal solution of the stator winding slot position distribution and arrangement scheme, the coil turn number of the stator winding and the parallel branch number Pa combination so as to obtain the optimal stator winding slot position distribution and arrangement scheme and the coil turn number combination of the stator winding. According to the invention, the applicability of the stator winding design can be improved, and the suppression effect on the short-circuit current is improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a design method, system, and medium for a low short-circuit current motor stator winding. Background Technology

[0002] Permanent magnet synchronous generators, with their core advantages of high efficiency and high power density, have become the mainstream model in the wind power generation field, especially in high-power wind turbine units. However, with the continuous increase in the single-unit capacity of wind turbine units and the increasing demands of the power grid for the safety and stability of grid-connected equipment, the problem of excessive short-circuit current is becoming increasingly prominent. This not only causes impact damage to core components such as the generator stator windings and rotor permanent magnets, but also affects the grid's low-voltage ride-through (LVRT) capability, restricting the grid compatibility of large-capacity wind turbine units and becoming a key technical bottleneck that the industry urgently needs to address.

[0003] To suppress short-circuit current in permanent magnet wind turbines, existing technologies have mainly developed two core solutions: First, adopting a double three-phase winding topology and configuring specific phase shift angles (such as 7.5° or 30°) to reduce harmonic components in the windings and improve winding self-inductance parameters through optimized phase shift angle design, thereby achieving the purpose of suppressing short-circuit current; Second, combining distributed winding structure with star connection method to enhance the electromagnetic isolation effect of each phase winding and reduce the short-circuit current amplification effect caused by inter-phase electromagnetic coupling.

[0004] However, existing technologies still have significant shortcomings, specifically: 1) The optimization effect of phase shift angle is highly dependent on the specific structural parameters of the motor, such as slot-to-pole ratio and pole-to-arc ratio. A phase shift angle scheme designed for a specific combination of parameters is difficult to directly adapt to permanent magnet wind turbines with different structural specifications. 2) The number of winding turns is also one of the core factors affecting the inductance parameters of the motor: self-inductance and mutual inductance are approximately proportional to the square of the number of winding turns. A reasonable design of the number of turns can directly optimize the inductance characteristics and thus suppress short-circuit current. However, the existing technology has not incorporated the number of winding turns into a systematic optimization framework for short-circuit current suppression. It only relies on a fixed number of turns in conjunction with phase shift angle adjustment, and fails to accurately control the inductance parameters through the number of turns, resulting in limited short-circuit current suppression effect. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a design method, system and medium for a low short-circuit current motor stator winding, which addresses the above-mentioned problems in the prior art. The present invention aims to improve the applicability of stator winding design and improve the suppression effect on short-circuit current.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for designing stator windings of a low short-circuit current motor includes the following steps: S101, based on the number of slots in the motor stator Z polar number p Sum of phases m Obtain all feasible stator winding slot allocation schemes and the number of coil turns of each phase stator winding. and the number of parallel branches P a Consistent; S102, based on all feasible stator winding slot allocation and arrangement schemes, and the number of coil turns of the stator winding. Number of parallel branches of stator winding P a To optimize the variables, with the minimization of short-circuit current peak characteristics and the minimization of copper losses in each phase winding as the optimization objectives, we seek the stator winding slot allocation scheme and the number of coil turns in the stator winding. Number of parallel branches of combined and stator windings P a The optimal solution is obtained, thus yielding the optimal stator winding slot allocation scheme and the optimal number of turns in the stator winding. Number of parallel branches of stator winding P a combination.

[0007] Optionally, the magnitude of the short-circuit current peak characteristic is related to the short-circuit current rise rate. The short-circuit current rise rate is used as an evaluation criterion. The expression is: , in, It is a flux linkage matrix. , Indicates the first Total flux linkage of the phase stator winding; It is the inductance function matrix. , This represents the self-inductance of the first phase winding. This indicates the mutual inductance between the second phase winding and the first phase winding.

[0008] Optionally, the total flux linkage of the stator winding is calculated as follows: , in, Indicates the first Total flux linkage of the phase stator winding, Indicates the first The self-inductance of the stator winding, Indicates the first Phase stator winding and the first Mutual inductance of phase stator windings Indicates the first Permanent magnet flux linkage of the stator winding, Indicates the rotor position angle, Indicates the first The current in the phase stator winding, Indicates the first Current in the phase stator winding; No. permanent magnet flux linkage of phase stator winding The expression is: , in, Indicates the first Phase stator winding function, Indicates the air gap magnetic flux density of the permanent magnet. Represents the electrical angle in space; No. Self-inductance of phase stator winding The expression is: , No. Phase stator winding and the first Mutual inductance of phase stator windings The expression is: , in, Represents the permeability of free space. Indicates the air gap length. Indicates the first Phase stator winding function.

[0009] Optionally, the total copper loss of each phase winding is calculated as follows: , in, This indicates the total copper loss of each phase winding. Represents the current matrix. Represents the resistance matrix; ,in, No. Current in the phase stator winding; ,in, Indicates the first The resistance of the phase stator winding, ,in It is the resistivity of the stator winding. It is the length of the stator winding conductor. It is the cross-sectional area of ​​the stator winding conductor.

[0010] Optionally, in step S102, the stator winding slot allocation scheme and the number of coil turns of the stator winding are determined. Number of parallel branches of stator winding P a Finding the optimal solution for the combination involves identifying a stator winding slot allocation scheme that satisfies the following constraints: the number of turns per phase stator winding. The optimal solution for the combination: , in, This indicates torque pulsation. This represents the target torque ripple threshold. , Indicates the magnitude of torque ripple. This represents the average torque. Indicates output power. , Indicates the target output power. Indicates the rated speed of the motor. This indicates the specified lower threshold value of the stator winding terminal voltage. This indicates the specified upper limit threshold of the stator winding terminal voltage. This indicates the voltage at the stator winding terminals. , Indicates magnetic flux.

[0011] Optionally, in step S102, a multi-objective optimization algorithm is used to find the stator winding slot allocation scheme and the number of coil turns of the stator winding. Number of parallel branches of stator winding P a The optimal solution for the combination.

[0012] Optionally, before step S102, the method further includes selecting an effective stator winding slot allocation scheme from all stator winding slot allocation schemes; in step S102, the effective stator winding slot allocation scheme and the number of coil turns per phase stator winding are used as the basis for the selection. To optimize variables, the effective stator winding slot allocation scheme satisfies the following condition: the winding function of each phase stator winding... Within the preset set of harmonic orders to be suppressed The corresponding harmonic subspaces are orthogonal, i.e., they satisfy the following condition: , in, Indicates the first Phase stator winding function, express Permanent magnet air gap magnetic flux density under subharmonics Represents the electrical angle in space. Indicates the rotor position angle; Furthermore, the present invention also provides a low short-circuit current motor stator winding design system, including a microprocessor and a memory interconnected thereto, the microprocessor being programmed or configured to execute the low short-circuit current motor stator winding design method.

[0013] Furthermore, the present invention also provides a computer-readable storage medium storing a computer program or instructions that are programmed or configured to execute the low short-circuit current motor stator winding design method by a processor.

[0014] In addition, the present invention also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the low short-circuit current motor stator winding design method by a processor.

[0015] Compared with the prior art, the present invention can mainly achieve the following beneficial effects: This invention uses feasible stator winding slot allocation schemes, the number of stator winding turns, and the number of parallel branches in the stator winding as triple optimization variables to synergistically control the motor's inductance characteristics. It precisely minimizes the peak short-circuit current characteristics from an electromagnetic perspective, effectively improving short-circuit current suppression and enhancing the safety of motor and power grid operation. Simultaneously, maintaining a consistent number of turns in each phase, coupled with an adaptive slot allocation scheme based on the number of slots, pole pairs, and phases, ensures balanced electromagnetic characteristics between phases, significantly reducing torque ripple and harmonic interference, and enhancing the unit's fault tolerance and operational stability. This invention employs a dual-objective optimization design that minimizes both peak short-circuit current characteristics and winding copper losses. While efficiently suppressing short-circuit current, it effectively reduces winding temperature rise and energy loss, balancing motor output performance and thermal stability to meet long-term reliable operation requirements. Furthermore, the solution does not rely on specific phase shift angles or fixed structural parameters, allowing for flexible adaptation to motors with different numbers of slots, pole pairs, and phases, thus demonstrating good applicability. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the low short-circuit current motor stator winding design method of the present invention.

[0017] Figure 2 This is a schematic diagram of the motor structure in a specific case.

[0018] Figure 3 This is a schematic diagram showing the connection of the first, second, and third branches of the first phase stator winding in a specific case.

[0019] Figure 4 This is a schematic diagram showing the connection of the fourth, fifth, and sixth branches of the first phase stator winding in a specific case.

[0020] Figure 5This is a schematic diagram showing the connection of the seventh, eighth, and ninth branches of the first phase stator winding in a specific case. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] like Figure 1 As shown, this embodiment provides a method for designing a low short-circuit current motor stator winding, including the following steps: S101, based on the number of slots in the motor stator Z polar number p Sum of phases m Obtain all feasible stator winding slot allocation schemes and the number of coil turns of each phase stator winding. and the number of parallel branches P a Consistent; S102, based on all feasible stator winding slot allocation and arrangement schemes, and the number of coil turns of the stator winding. Number of parallel branches of stator winding P a To optimize the variables, with the minimization of short-circuit current peak characteristics and the minimization of copper losses in each phase winding as the optimization objectives, we seek the stator winding slot allocation scheme and the number of coil turns in the stator winding. Number of parallel branches of stator winding P a The optimal solution for the combination is obtained, thus yielding the optimal stator winding slot allocation scheme and the optimal number of turns in the stator winding. Number of parallel branches of stator winding P a Combination. It should be noted that a feasible stator winding slot allocation scheme refers to a scheme that allows the motor to operate normally.

[0023] This embodiment of the low short-circuit current motor stator winding design method uses feasible stator winding slot allocation schemes, stator winding coil turns, and the number of parallel branches of the stator winding as triple optimization variables to synergistically control the motor's inductance characteristics. This precisely minimizes the peak characteristics of the short-circuit current from an electromagnetic perspective, effectively improving the suppression of short-circuit current and enhancing the safety of motor and power grid operation. Simultaneously, maintaining a consistent number of coil turns in each phase, combined with an adaptive slot allocation scheme based on the number of slots, pole pairs, and phases, ensures balanced electromagnetic characteristics between phases, significantly reducing torque ripple and harmonic interference, and enhancing the unit's fault tolerance and operational stability. The dual-objective optimization design of minimizing short-circuit current peak characteristics and winding copper losses effectively suppresses short-circuit current while reducing winding temperature rise and energy loss, balancing motor output performance and thermal stability to meet long-term reliable operation requirements. Furthermore, the solution does not rely on specific phase shift angles or fixed structural parameters, allowing for flexible adaptation to motors with different numbers of slots, pole pairs, and phases, demonstrating good applicability.

[0024] Optionally, the magnitude of the short-circuit current peak characteristic is related to the short-circuit current rise rate. The rate of rise of short-circuit current is used as an evaluation criterion. The expression is: (1) in, It is a flux linkage matrix. , Indicates the first Total flux linkage of the phase stator winding; It is the inductance function matrix. , This represents the self-inductance of the first phase winding. This indicates the mutual inductance between the second phase winding and the first phase winding.

[0025] Furthermore, in this embodiment, the total flux linkage of the stator winding is calculated as follows: (2) in, Indicates the first Total flux linkage of the phase stator winding, Indicates the first The self-inductance of the stator winding, Indicates the first Phase stator winding and the first Mutual inductance of phase stator windings Indicates the first Permanent magnet flux linkage of the stator winding, Indicates the rotor position angle, Indicates the first The current in the phase stator winding, Indicates the first Current in the phase stator winding; No. permanent magnet flux linkage of phase stator winding The expression is: (3) in, Indicates the first Phase stator winding function, Indicates the air gap magnetic flux density of the permanent magnet. Represents the electrical angle in space; No. Self-inductance of phase stator winding The expression is: (4) No. Phase stator winding and the first Mutual inductance of phase stator windings The expression is: (5) in, Represents the permeability of free space. Indicates the air gap length. Indicates the first Phase stator winding function.

[0026] Furthermore, in this embodiment, the formula for calculating the total copper loss of each phase winding is: (6) in, This indicates the total copper loss of each phase winding. Represents the current matrix. Represents the resistance matrix; ,in, No. Current in the phase stator winding; ,in, Indicates the first The resistance of the phase stator winding, ,in It is the resistivity of the stator winding. It is the length of the stator winding conductor. It is the cross-sectional area of ​​the stator winding conductor.

[0027] Specifically, the rate of rise of short-circuit current Based on the functional expression of the phase-to-phase short-circuit transient current, the functional expression of the phase-to-phase short-circuit transient current is: (7) in, Indicates transient current. This represents the electric angular velocity. From equation (7), it can be seen that the transient current... The size depends on and The product of these two factors is used to define the rate of rise of the short-circuit current. .

[0028] Furthermore, in this embodiment, step S102 involves finding the stator winding slot allocation scheme and the number of coil turns of the stator winding. Finding the optimal solution for the combination involves identifying a stator winding slot allocation scheme that satisfies the following constraints: the number of turns per phase stator winding. The optimal solution for the combination: (8) in, This indicates torque pulsation. This represents the target torque ripple threshold. , Indicates the magnitude of torque ripple. This represents the average torque. Indicates output power. , Indicates the target output power. Indicates the rated speed of the motor. This indicates the specified lower threshold value of the stator winding terminal voltage. This indicates the specified upper limit threshold of the stator winding terminal voltage. This indicates the voltage at the stator winding terminals. , This represents magnetic flux. Adding constraints on torque ripple, output power, and stator winding terminal voltage effectively ensures smooth motor operation, reduces vibration and noise, lowers fatigue wear on mechanical components, and extends motor lifespan. Simultaneously, by constraining the stator winding terminal voltage and output power to target values, it ensures that the optimized winding design does not sacrifice the motor's core power generation capacity, meeting power output requirements under actual operating conditions. Furthermore, the addition of constraints narrows the search range for the optimal solution, accelerating the design process.

[0029] Furthermore, in this embodiment, in step S102, a multi-objective optimization algorithm is used to find the stator winding slot allocation scheme and the number of coil turns per phase stator winding. Number of parallel branches of stator winding P aThe optimal solution for the combination. A multi-objective optimization algorithm can simultaneously address three potentially conflicting objectives: minimizing the peak short-circuit current characteristics, minimizing the combined copper losses of each phase winding (e.g., increasing the number of turns may reduce short-circuit current but increase copper losses). Under the premise of satisfying constraints such as torque ripple and output power, a balanced solution that considers multiple objectives is found, avoiding performance imbalances caused by single-objective optimization and improving the practicality and engineering adaptability of the solution. Available multi-objective optimization algorithms include: NSGA-II (Non-Dominated Sorting Genetic Algorithm), MOPSO (Multi-Objective Particle Swarm Optimization), and MOEA / D (Decomposition-Based Multi-Objective Evolutionary Algorithm).

[0030] Furthermore, in this embodiment, before step S102, the method further includes selecting an effective stator winding slot allocation scheme from all stator winding slot allocation schemes; in step S102, the effective stator winding slot allocation scheme and the number of coil turns per phase stator winding are used as the basis for the selection. To optimize variables, the effective stator winding slot allocation scheme must satisfy the following conditions: the winding function of each phase stator winding. Within the preset set of harmonic orders to be suppressed The corresponding harmonic subspaces are orthogonal, i.e., they satisfy the following condition: (9) in, Indicates the first Phase stator winding function, , Indicates the harmonic order. and These are the Fourier expansion coefficients. express Permanent magnet air gap magnetic flux density under subharmonics Represents the electrical angle in space. The rotor position angle is indicated. By pre-screening effective slot allocation schemes that meet the orthogonality condition of the harmonic subspace, the preset harmful harmonics (such as harmonics that cause short-circuit current amplification, torque pulsation, or increased copper loss) are suppressed from the source, reducing the interference of invalid schemes on the subsequent optimization process and improving design efficiency and the reliability of the final scheme. Specifically, the orthogonality condition (9) ensures that there is no electromagnetic coupling in the harmonic subspace to be suppressed for each phase winding, which can directly weaken the phase-to-phase interference caused by these harmonics, reduce the deterioration effect of harmonics on short-circuit current and copper loss, and form a synergy with the subsequent optimization objectives of minimizing the peak characteristics of short-circuit current and minimizing the copper loss of each phase winding, thus avoiding the waste of computing power in invalid schemes with severe harmonic pollution during the optimization process.

[0031] As an optional implementation, when the number of motor phases m is 12, a preset set of harmonic orders to be suppressed is used. Of course, in other embodiments, the set of harmonic orders to be suppressed can also be different, as long as the following formula is satisfied: (10) in, Represents a positive integer.

[0032] As an optional implementation, all feasible stator winding slot allocation schemes satisfy the following conditions: the structural parameters of the stator windings of each phase are set to be consistent, and the electrical angle between the stator windings of two adjacent phases is 360° / m.

[0033] This embodiment is based on a low short-circuit current motor stator winding design method, and analyzes it in conjunction with a specific case—the design object is a motor with 216 stator slots, 18 pole pairs, and 12 phases, and each stator slot is divided into upper and lower slots (see...). Figure 2 ), The constraints are: target torque ripple threshold of 2%, target output power of 15MW, lower limit of stator winding terminal voltage of 750V, and upper limit of stator winding terminal voltage of 790V. The optimal stator winding slot allocation scheme, the number of turns N in the stator winding, and the number of parallel branches Pa in the stator winding are combined as follows: number of turns N in the stator winding... N The number of parallel branches is 18. P a The stator winding slot allocation scheme is as follows: the coil of the first branch of the first phase winding includes (see...). Figure 3 ): Two coils connected in series, 1 (bottom) - 6 (top) and 13 (bottom) - 18 (top); the coil of the second branch of the first phase winding includes (see...) Figure 3 ): Two coils connected in series: 25 (bottom) - 30 (top) and 37 (bottom) - 42 (top); the coil of the third branch of the first phase winding includes (see...) Figure 3 ): 49 (bottom) - 54 (top) and 61 (bottom) - 66 (top) are two coils connected in series; the coil of the fourth branch of the first phase winding includes (see...) Figure 4 ): Two coils connected in series: 73 (bottom) - 78 (top) and 85 (bottom) - 90 (top); the coil of the fifth branch of the first phase winding includes (see...) Figure 4 ): Two coils connected in series: 97 (bottom) - 102 (top) and 109 (bottom) - 114 (top); the coil of the sixth branch of the first phase winding includes (see...) Figure 4 ): Two coils connected in series: 121 (bottom) - 126 (top) and 133 (bottom) - 138 (top); the coil of the seventh branch of the first phase winding includes (see...) Figure 5): Two coils connected in series: 145 (bottom) - 150 (top) and 157 (bottom) - 162 (top); the coil of the eighth branch of the first phase winding includes (see...) Figure 5 ): Two coils connected in series: 169 (bottom) - 174 (top) and 181 (bottom) - 186 (top); the coil of the ninth branch of the first phase winding includes (see...) Figure 5 ): Two coils connected in series: 193 (bottom) - 198 (top) and 205 (bottom) - 210 (top). The slot pitch between the second phase winding and the first phase winding is... 4， The coils of the first branch of the second phase winding are defined as follows: two coils connected in series, 5 (bottom) - 10 (top) and 17 (bottom) - 22 (top); the coils of the second branch of the second phase winding are defined as follows: two coils connected in series, 29 (bottom) - 34 (top) and 41 (bottom) - 46 (top); the coils of the third branch of the second phase winding are defined as follows: two coils connected in series, 53 (bottom) - 58 (top) and 65 (bottom) - 70 (top); the coils of the fourth branch of the second phase winding are defined as follows: two coils connected in series, 77 (bottom) - 82 (top) and 89 (bottom) - 94 (top); the coils of the fifth branch of the second phase winding are defined as follows: 101 (bottom) - 106 (top) and 113... The second phase winding consists of two coils connected in series: 125 (bottom) - 130 (top) and 137 (bottom) - 142 (top); the second phase winding consists of two coils connected in series: 149 (bottom) - 154 (top) and 161 (bottom) - 166 (top); the second phase winding consists of two coils connected in series: 173 (bottom) - 178 (top) and 185 (bottom) - 190 (top); the second phase winding consists of two coils connected in series: 197 (bottom) - 202 (top) and 209 (bottom) - 214 (top). Similarly, with each phase having a slot pitch of 4 units from its adjacent phase, the coil positions of the other ten phase stator windings can be obtained.

[0034] Furthermore, this embodiment also provides a low short-circuit current motor stator winding design system, including a microprocessor and a memory interconnected, wherein the microprocessor is programmed or configured to execute the above-described low short-circuit current motor stator winding design method.

[0035] In addition, this embodiment also provides a computer-readable storage medium storing a computer program or instructions that are programmed or configured to execute the above-described low short-circuit current motor stator winding design method by a processor.

[0036] In addition, this embodiment also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the above-described low short-circuit current motor stator winding design method by a processor.

[0037] Those skilled in the art will understand that the technical solutions provided by this invention may take the form of a method, system, or computer program product. Therefore, this invention may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention may take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, produce an implementation of the flowchart... Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0038] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for designing the stator winding of a low short-circuit current motor, characterized in that, Includes the following steps: S101, based on the number of slots in the motor stator Z polar number p Sum of phases m Obtain all feasible stator winding slot allocation schemes and the number of coil turns of each phase stator winding. and the number of parallel branches P a Consistent; S102, based on all feasible stator winding slot allocation and arrangement schemes, and the number of coil turns of the stator winding. Number of parallel branches of stator winding P a To optimize the variables, with the minimization of short-circuit current peak characteristics and the minimization of copper losses in each phase winding as the optimization objectives, we seek the stator winding slot allocation scheme and the number of coil turns in the stator winding. Number of parallel branches of stator winding P a The optimal solution for the combination is obtained, thus yielding the optimal stator winding slot allocation scheme and the optimal number of turns in the stator winding. Number of parallel branches of stator winding P a combination.

2. The low short-circuit current motor stator winding design method according to claim 1, characterized in that, The magnitude of the short-circuit current peak characteristic is related to the short-circuit current rise rate. The short-circuit current rise rate is used as an evaluation criterion. The expression is: ， in, It is a flux linkage matrix. , Indicates the first Total flux linkage of the phase stator winding; It is the inductance function matrix. , This represents the self-inductance of the first phase winding. This indicates the mutual inductance between the second phase winding and the first phase winding.

3. The low short-circuit current motor stator winding design method according to claim 2, characterized in that, The formula for calculating the total flux linkage of the stator winding is: ， in, Indicates the first Total flux linkage of the phase stator winding, Indicates the first The self-inductance of the stator winding, Indicates the first Phase stator winding and the first Mutual inductance of phase stator windings Indicates the first Permanent magnet flux linkage of the stator winding, Indicates the rotor position angle, Indicates the first The current in the phase stator winding, Indicates the first Current in the phase stator winding; No. permanent magnet flux linkage of phase stator winding The expression is: ， in, Indicates the first Phase stator winding function, Indicates the air gap magnetic flux density of the permanent magnet. Represents the electrical angle in space; No. Self-inductance of phase stator winding The expression is: ， No. Phase stator winding and the first Mutual inductance of phase stator windings The expression is: ， in, Represents the permeability of free space. Indicates the air gap length. Indicates the first Phase stator winding function.

4. The low short-circuit current motor stator winding design method according to claim 1, characterized in that, The formula for calculating the total copper loss of each phase winding is: ， in, This indicates the total copper loss of each phase winding. Represents the current matrix. Represents the resistance matrix; ,in, No. Current in the phase stator winding; ,in, Indicates the first The resistance of the phase stator winding, ,in It is the resistivity of the stator winding. It is the length of the stator winding conductor. It is the cross-sectional area of ​​the stator winding conductor.

5. The low short-circuit current motor stator winding design method according to claim 1, characterized in that, In step S102, the stator winding slot allocation and arrangement scheme and the number of coil turns of the stator winding are determined. Number of parallel branches of stator winding P a Finding the optimal solution for the combination involves identifying a stator winding slot allocation scheme that satisfies the following constraints: the number of turns per phase stator winding. The optimal solution for the combination: ， in, This indicates torque pulsation. This represents the target torque ripple threshold. , Indicates the magnitude of torque ripple. This represents the average torque. Indicates output power. , Indicates the target output power. Indicates the rated speed of the motor. This indicates the specified lower threshold value of the stator winding terminal voltage. This indicates the specified upper limit threshold of the stator winding terminal voltage. This indicates the voltage at the stator winding terminals. , Indicates magnetic flux.

6. The low short-circuit current motor stator winding design method according to claim 1, characterized in that, In step S102, a multi-objective optimization algorithm is used to find the stator winding slot allocation scheme and the number of coil turns of the stator winding. Number of parallel branches of stator winding P a The optimal solution for the combination.

7. The low short-circuit current motor stator winding design method according to claim 1, characterized in that, Before step S102, the method further includes selecting an effective stator winding slot allocation scheme from all stator winding slot allocation schemes; in step S102, the effective stator winding slot allocation scheme and the number of coil turns per phase stator winding are used as the basis for the selection. To optimize variables, the effective stator winding slot allocation scheme satisfies the following condition: the winding function of each phase stator winding... Within the preset set of harmonic orders to be suppressed The corresponding harmonic subspaces are orthogonal, i.e., they satisfy the following condition: ， in, Indicates the first Phase stator winding function, express Permanent magnet air gap magnetic flux density under subharmonics Represents the electrical angle in space. Indicates the rotor position angle.

8. A low short-circuit current motor stator winding design system, comprising a microprocessor and a memory interconnected, characterized in that, The microprocessor is programmed or configured to execute the low short-circuit current motor stator winding design method according to any one of claims 1 to 7.

9. A computer-readable storage medium storing a computer program or instructions, characterized in that, The computer program or instructions are programmed or configured to execute the low short-circuit current motor stator winding design method according to any one of claims 1 to 7 via a processor.

10. A computer program product, comprising a computer program or instructions, characterized in that, The computer program or instructions are programmed or configured to execute the low short-circuit current motor stator winding design method according to any one of claims 1 to 7 via a processor.

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