Parametric modeling method for outer rotor permanent magnet synchronous motor

Abstract

The invention discloses a parametric modeling method for an outer rotor permanent magnet synchronous motor, and relates to the technical field of motor design, and the method comprises the steps: repeatedly calling modeling modules in finite element analysis software, and respectively defining the modeling modules as a stator modeling module and a magnetic steel modeling module; stator design parameters and a to-be-solved parameter calculation formula are written in the stator modeling module, the slot shoulder bottom width, the slot bottom width and the stator tooth width serve as to-be-solved parameters and have a geometric constraint relation, and all the to-be-solved parameters are obtained through calculation of related design parameters; magnetic steel parameters and numerical values are written in the magnetic steel modeling module; the stator modeling module and the magnetic steel modeling module are operated, an outer rotor permanent magnet synchronous motor assembling model is obtained, the rotor yoke surrounds the outer ring of the stator tooth part, and the magnetic steel is located between the rotor yoke and the stator tooth part. According to the method, the motor design model is quickly adjusted and optimized by changing the parameter values, the motor design precision is remarkably improved, and the research and development period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of motor design, and in particular to a parameterized modeling method for an outer rotor permanent magnet synchronous motor. Background Art

[0002] In today's rapidly developing industrial automation field, the performance and efficiency of the motor as the core component of the drive system play a decisive role in the stability and economy of the entire system. Outer Rotor Permanent Magnet Synchronous Motor (OR-PMSM) has been widely used in many high-end fields such as industrial automation, new energy vehicles, aerospace, etc. due to its compact structure, high efficiency and fast response. However, in the face of growing complex application needs, the traditional motor design method that relies on empirical formulas and test data has shown limitations such as long design cycle, high cost, and difficulty in personalized customization.

[0003] In addition, when optimizing the motor model, it is only possible to analyze whether the motor performance has been improved by modifying each motor-related parameter individually. Repeated modification of single parameters makes the model optimization process cumbersome and inefficient, lacking a comprehensive evaluation of the overall performance of the motor, and facing the challenges of large computational complexity and insufficient precision when processing full-size motor models. Summary of the invention

[0004] In view of the above problems and technical requirements, the inventors have proposed a parametric modeling method for an outer rotor permanent magnet synchronous motor, which utilizes modern numerical calculation technology, especially finite element analysis (FEA), combined with script parametric modeling technology to achieve efficient and accurate design of the motor model. The technical solution of the present invention is as follows:

[0005] A parametric modeling method for an outer rotor permanent magnet synchronous motor comprises the following steps:

[0006] Repeatedly call the modeling modules in the finite element analysis software, which are defined as a stator modeling module and a magnetic steel modeling module respectively;

[0007] In the stator modeling module, write the stator design parameters and the calculation formula of the parameters to be solved. Among them, the slot shoulder bottom width, slot bottom width and stator tooth width are the parameters to be solved and there is a geometric constraint relationship. Each parameter to be solved is calculated through the relevant design parameters;

[0008] In the magnetic steel modeling module, enter the magnetic steel parameters and values;

[0009] Run the stator modeling module and the magnetic steel modeling module to obtain the outer rotor permanent magnet synchronous motor assembly model, in which the rotor yoke surrounds the outer ring of the stator teeth and the magnetic steel is located between the rotor yoke and the stator teeth.

[0010] Its further technical solution is that the design process of the groove shoulder bottom width calculation formula includes:

[0011] In the isosceles trapezoid formed by the slot opening and the slot shoulder bottom of the stator slot, the upper base of the trapezoid is the slot width Bs 0 , the bottom of the trapezoid is the width of the bottom of the groove shoulder Bs 1 , the trapezoid height is the slot shoulder height Hs 1 , the bottom angle of the trapezoid is the groove shoulder angle α, Bs 0 , Hs 1 and α are stator design parameters;

[0012] According to the geometric relationship of the isosceles trapezoid, the width of the bottom of the groove shoulder is Bs 1 It is expressed as:

[0013]

[0014] A further technical solution is that the design process of the stator tooth width calculation formula includes:

[0015] Assume that the angle between the center axes of two adjacent stator teeth is the slot angle β, extend the bottom edge CD of the slot shoulder to intersect the center axis of the stator tooth on the side close to point D at point P, draw a perpendicular line through point D to the center axis of the stator tooth and intersect it at point H;

[0016] In the right triangle DHP, DH is half of the stator tooth width, ∠HDP is half of the slot angle β, and the stator tooth width ToothWidth is expressed as:

[0017]

[0018] Where SlotNum is the number of stator slots.

[0019] A further technical solution is that the calculation method for obtaining the PD length includes:

[0020] Assume that the center axis of two adjacent stator teeth intersects at point O, and the center axis of the stator slot intersects the bottom edge CD of the slot shoulder at point M, then PD = PM-DM, where DM is the bottom width of the slot shoulder Bs 1 half of;

[0021] In the right triangle OMP, ∠MOP is half of the slot angle β, then:

[0022]

[0023] In the formula, DiaGap 1 is the stator outer diameter; Hs 0 is the slot height, Hs 1 is the slot shoulder height, Hs 0 and Hs1 Design parameters for the stator.

[0024] A further technical solution is that the design process of the groove bottom width calculation formula includes:

[0025] Assume that the angle between the center axes of two adjacent stator teeth is the slot pitch angle β. The center axis of the stator slot intersects the slot shoulder bottom edge CD and the slot bottom edge at points M and F respectively. In the right-angle trapezoid FMDE formed by the slot shoulder bottom and the slot bottom of the stator slot, draw a perpendicular line from the slot bottom end point E to MD and intersect it at point G. Then FM=Hs 2 =EG, EF = MG and is the groove bottom width Bs 2 Half of the width of the groove shoulder, where MG = MD-GD, MD is the width of the groove shoulder bottom Bs 1 Half of Hs 2 is the height from the bottom of the groove shoulder to the bottom of the groove, then the groove bottom width Bs 2 It is expressed as:

[0026] Bs 2 =Bs 1 -2GD.

[0027] A further technical solution is that the calculation method for obtaining the GD length includes:

[0028] In the right triangle EGD, ∠GED is half of the slot angle β, then:

[0029]

[0030] Where SlotNum is the number of stator slots.

[0031] A further technical solution is that when the width of the bottom of the groove shoulder is Bs 1 and groove bottom width Bs 2 When the slot shoulder angle α in is the same, the motor stator is a slot type with equal tooth width; when the slot shoulder bottom width Bs 1 and groove bottom width Bs 2 When the slot shoulder angle α in is different, the motor stator is a non-equal tooth width and heterogeneous slot type.

[0032] A further technical solution is that the parameters to be solved also include the stator yoke thickness StatorYokeThk and the rotor outer diameter DiaOuter, which are respectively expressed as:

[0033]

[0034] DiaOuter=DiaGap 1 +2AirGap+2MagThk+2RotorYokeThk;

[0035] In the formula, DiaGap 1is the stator outer diameter, DiaStatorYoke is the stator yoke inner diameter, Hs 0 Hs is the height of the slot in the stator slot. 1 Hs is the height of the slot shoulder in the stator slot 2 is the height from the bottom of the slot shoulder to the bottom of the slot, Rs is the radius of the slot bottom fillet; AirGap is the air gap length between the stator and the magnetic steel, MagThk is the magnetic steel thickness, RotorYokeThk is the rotor yoke thickness; Hs 0 , Hs 1 , Hs 2 , AirGap, MagThk and RotorYokeThk are stator design parameters.

[0036] Its further technical solution is that in the stator modeling module, the stator outer diameter is set to 200mm-210mm, the stator yoke inner diameter is set to 151mm-161mm, and the rotor outer diameter is set to 215mm-229mm, and the outer rotor permanent magnet synchronous motor assembly model is modeled within this range.

[0037] A further technical solution is that the magnetic steel parameters include the magnetic steel inner diameter DiaGap 2 , magnet outer diameter DiaYoke, magnet length and angle information, magnet pole number, half-axis parameters, core information; Among them:

[0038] DiaGap 2 =DiaGap 1 +2AirGap;

[0039] DiaYoke=DiaGap 1 +2AirGap+2MagThk;

[0040] In the formula, DiaGap 1 is the stator outer diameter, AirGap is the air gap length between the stator and the magnetic steel, MagThk is the magnetic steel thickness, and AirGap and MagThk are stator design parameters.

[0041] The beneficial technical effects of the present invention are:

[0042] This method uses a modeling module in a reusable finite element analysis software. This module is a standardized module that designers can reuse and quickly adjust and optimize motor components by changing parameter values, thereby simplifying the motor design process. In this method, the geometric constraint relationship between the slot shoulder bottom width and the slot bottom width and stator tooth width is designed. Therefore, when the slot shoulder bottom width changes, the slot bottom width and stator tooth width will automatically change accordingly, which not only enhances the flexibility of motor design, but also significantly reduces the repetitive work in the traditional design process. By precisely controlling the design variables, the accuracy of motor performance prediction is improved.

[0043] This method not only solves the efficiency bottleneck in traditional design, but also opens the door to personalization and customization of motor design through digitalization and parameterization technology. This will greatly shorten the R&D cycle of motor products, reduce costs, and improve product performance and reliability, meet the market's urgent demand for high-efficiency and energy-saving motors, and further provide strong support for subsequent motor optimization analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of the parametric modeling method of the outer rotor permanent magnet synchronous motor provided in this application.

[0045] Figure 2 This is the full model of the stator core provided in this application.

[0046] Figure 3 It is a schematic diagram of a single-pole single-slot model provided in this application.

[0047] Figure 4 It is the calculation model of the groove shoulder bottom width provided in this application.

[0048] Figure 5 It is the stator tooth width calculation model provided in this application.

[0049] Figure 6 It is the groove bottom width calculation model provided in this application.

[0050] Figure 7 It is a schematic diagram of the outer rotor permanent magnet synchronous motor assembly model provided in this application. DETAILED DESCRIPTION

[0051] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0052] This application provides a parametric modeling method for an outer rotor permanent magnet synchronous motor. This method cleverly combines advanced simulation industrial software with the VBS (Visual Basic Scripting) scripting language to achieve efficient construction and accurate simulation of the motor model. This combination not only improves the digital level of motor design, but also achieves parameterization of the model, thus bringing unprecedented flexibility and accuracy to motor design. This application takes the outer rotor permanent magnet synchronous motor as an example to explain in detail the proposed motor parametric modeling method, combined with Figure 1 The specific steps shown include:

[0053] Step 1: Call the modeling module that comes with the finite element analysis software and define it as the stator modeling module.

[0054] Step 2: In the stator modeling module, use VBS scripting language to write the stator design parameters and the calculation formula of the parameters to be solved. The overall stator model is as follows: Figure 2 As shown in Table 1, a groove with equal area is punched out on the entire silicon steel strip. The size of the groove is mainly determined by the following parameters:

[0055] Table 1. Stator parameters

[0056] Parameter name parameter Numeric unit Number of stator slots SlotNum 54 / Magnetic pole number NumPoles 60 / Stator outer diameter <![CDATA[DiaGap 1 ]]> 210 mm Stator yoke inner diameter DiaStatorYoke 153 mm Notch height <![CDATA[Hs 0 ]]> Design value mm Groove shoulder height <![CDATA[Hs 1 ]]> Design value mm Shoulder Angle α Design value deg Groove Depth <![CDATA[Hs 2 ]]> Design value mm Slot width <![CDATA[Bs 0 ]]> Design value mm Groove shoulder bottom width <![CDATA[Bs 1 ]]> Calculated Value mm Groove bottom width <![CDATA[Bs 2 ]]> Calculated Value mm Stator tooth width ToothWidth Calculated Value mm Stator yoke thickness StatorYokeThk Calculated Value mm Slot Angle β Fixed value deg Air gap length AirGap Design value mm Magnetic steel thickness MagThk Design value mm Rotor yoke thickness RotorYokeThk Design value mm Rotor outer diameter DiaOuter Calculated Value mm

[0057] For the specific meaning of the above physical dimensions, please refer to Figure 3 , Figure 7 , determine the design value part of the above parameters, each parameter to be solved can be calculated through the relevant design parameters, and then the punching of a motor stator can be determined, and the parameters can be optimized based on a certain motor performance target. 1 , Groove bottom width Bs 2 The stator tooth width ToothWidth and the stator tooth width ToothWidth are the parameters to be solved and have the following geometric constraints:

[0058] <1> Groove shoulder bottom width Bs 1 The design process of the calculation formula includes:

[0059] like Figure 4 As shown, in the isosceles trapezoid ABCD formed by the slot opening and the slot shoulder bottom of the stator slot, the central axis of the stator slot intersects the slot opening and the slot shoulder bottom at points N and M respectively, and the upper base AB of the trapezoid is Bs 0 , the lower base of the trapezoid CD=Bs 1 , trapezoid height MN = Hs 1 , the bottom angle of the trapezoid = ∠α, then according to the geometric relationship of the isosceles trapezoid, the bottom width of the groove shoulder is Bs 1 It is expressed as:

[0060]

[0061] <2> The design process of the stator tooth width ToothWidth calculation formula includes:

[0062] like Figure 5 As shown, let the angle between the central axes of two adjacent stator teeth be the slot pitch angle β, and they intersect at point O (i.e., the center of the stator circle O. Since the attached figure is an enlarged schematic diagram, point O is outside the paper). Extend the bottom edge CD of the slot shoulder to intersect the central axis of the stator tooth on the side close to point D at point P. Draw a perpendicular line from point D to the central axis of the stator tooth and intersect at point H. In the right triangle OMP, ∠MOP is half of the slot pitch angle β. Combined with the length of MO, the length of PM can be calculated. In the right triangle DHP, DH is half of the stator tooth width, and ∠HDP is half of the slot pitch angle β. Then the stator tooth width ToothWidth can be solved using the following formula:

[0063]

[0064] Where DM is the width of the bottom of the groove shoulder Bs 1 half.

[0065] <3> Groove bottom width Bs 2 The design process of the calculation formula includes:

[0066] like Figure 6 As shown, the central axis of the stator slot intersects the slot shoulder bottom edge CD and the slot bottom edge at points M and F. In the right-angle trapezoid FMDE formed by the slot shoulder bottom and the slot bottom of the stator slot, a perpendicular line is drawn from the slot bottom end point E to MD and intersects at point G, then FM=Hs 2 =EG, EF = MG and is the groove bottom width Bs 2 In the right triangle EGD, ∠GED is half of the slot angle β. Combined with the length of EG, the length of GD can be calculated, and the slot bottom width Bs 2 The following formula can be used to solve it:

[0067]

[0068] In the calculation process of the above parameters, when the groove shoulder bottom width Bs 1 and groove bottom width Bs 2 When the slot shoulder angle α in is the same, the motor stator is a slot type with equal tooth width; when the slot shoulder bottom width Bs 1 and groove bottom width Bs 2 When the slot shoulder angle α in is different, the motor stator is a non-equal tooth width and heterogeneous slot type.

[0069] Combination Figure 2 , Figure 3 As shown in the figure, the parameters to be solved, stator yoke thickness StatorYokeThk and rotor outer diameter DiaOuter, can be solved using the following formula:

[0070]

[0071] DiaOuter=DiaGap 1 +2AirGap+2MagThk+2RotorYokeThk (5)

[0072] Where Rs is the radius of the slot bottom fillet. In this embodiment, the stator outer diameter DiaGap 1 The inner diameter of the stator yoke is set to 200mm-210mm, the inner diameter of the stator yoke DiaStatorYoke is set to 151mm-161mm, and the outer diameter of the rotor DiaOuter is set to 215mm-229mm. The outer rotor permanent magnet synchronous motor assembly model is obtained by modeling within this range.

[0073] Step 3: Call the modeling module that comes with the finite element analysis software and define it as a magnetic steel modeling module.

[0074] Step 4: In the magnetic steel modeling module, use VBS scripting language to write magnetic steel parameters and values. Magnetic steel parameters include magnetic steel inner diameter DiaGap 2 , magnet outer diameter DiaYoke, magnet length and angle information, magnet pole number, half-axis parameters, core information. Among them:

[0075] DiaGap 2 =DiaGap 1 +2AirGap (6)

[0076] DiaYoke = DiaGap 1 +2AirGap+2MagThk (7)

[0077] Step 5: Run the stator modeling module and the magnetic steel modeling module to obtain the outer rotor permanent magnet synchronous motor assembly model. Figure 7 As shown, the rotor yoke 1 surrounds the outer ring of the stator teeth 2 , and the magnetic steel 3 is located between the rotor yoke 1 and the stator teeth 2 .

[0078] In this embodiment, the above modeling method is mainly implemented by VBS scripting language combined with the modeling module of finite element analysis software, wherein the stator modeling process uses the finite element's own modeling toolbox to write the above formulas (1) to (5) into the relevant parameters. Specifically, the stator parameters are defined using the VBS script toolbox, and the parameter names and parameter values ​​are as follows:

[0079] Name:="DiaGap 1 ",Value:="DiaGap"(stator outer diameter)

[0080] Name:="DiaYoke 1 ",Value:="DiaStatorYoke"(Inner diameter of stator)

[0081] Name:="Length",Value:="Stator_Lam_Length"(Stator Laminate Thickness)

[0082] Name:="Skew",Value:="StatorSkewAngle"(Stator skew angle)

[0083] Name:="Slots",Value:="SlotNumber_Stator"(Number of stator slots)

[0084] Name:="SlotType",Value:="3" (stator slot type, in this embodiment, the value 3 represents a trapezoidal slot)

[0085] Name:="Hs 0 ",Value:="Hs 0 _Stator"(notch height)

[0086] Name:="Hs 1 ",Value:="Hs 1 _Stator"(groove shoulder height)

[0087] Name:="Hs 2 ",Value:="Hs 2 _Stator"(groove depth)

[0088] Name:="Bs 0 ",Value:="Bs 0 _Stator"(slot width)

[0089] Name:="Bs 1 ",Value:="Bs 1 _Stator" (width of the bottom of the groove shoulder)

[0090] Name:="Bs 2 ","Value:="Bs 2 _Stator" (groove bottom width)

[0091] Name:="Rs","Value:="Rs_Stator"(groove chamfer)

[0092] Name:="FilletType",Value:="1" (Insulation type, slot insulation paper is used in this embodiment)

[0093] Name:="HalfSlot",Value:="0"(Half slot)

[0094] Name:="SegAngle",Value:="15deg"(angle information)

[0095] Name:="LenRegion",Value:="Model_Length"(Model length)

[0096] Name:="InfoCore",Value:="0"(Core information)

[0097] The above parameters are non-fixed values ​​and are parameterizable variables, among which Bs1 , Bs 2 The parameter values ​​of ToothWidth, StatorYokeThk, and DiaOuter are calculated by solving the written formulas (1) to (5).

[0098] Similarly, use the VBS script toolbox to define the magnetic steel parameters. The parameter names and values ​​are as follows:

[0099] Name:="DiaGap 2 ","Value:=","DiaGap 1 +2*AirGap"(magnetic steel inner diameter)

[0100] Name:="DiaYoke 2 ","Value:=","DiaGap 1 +2*Airgap+2*MagThk"(magnetic steel outer diameter)

[0101] Name:="Length","Value:=","0mm"(length information, 0 represents two-dimensional data, 1 represents three-dimensional data)

[0102] Name:="SegAngle","Value:=","0deg"(angle information)

[0103] Name:="Fractions","Value:=","NumPoles"(Number of magnetic poles)

[0104] Name:="HalfAxial","Value:=","HalfAxial"(Half-axis parameter)

[0105] Name:="InfoCore","Value:=","0"(Core information)

[0106] According to the above modeling process and modeling method, the maximum torque and torque pulsation of the motor are taken as the optimization target, and the design parameter Bs is optimized. 0 , Hs 0 , Hs 1 , Hs 2 The motor scanning calculation results can be found in Table 2.

[0107] Table 2. Parameterized scan calculation results

[0108]

[0109]

[0110] Table 2 is the result screened out from many design schemes, and the screening indicators are target torque Torque greater than 80Nm and torque pulsation rppile less than 1.8. The above results are not the optimal solutions, but only feasible solutions formulated according to the goals. As for the optimal solution, it should be the optimal result of compromise obtained by combining the optimization algorithm and the Pareto frontier. This content is the next step of work after running the parametric modeling method provided by this application. It can be seen from the above scanning data that the parametric modeling of this application is conducive to the realization of multi-parameter scanning calculation in the subsequent parameter optimization. The motor performance indicators can be optimized and improved based on a certain performance indicator, which illustrates the feasibility of this modeling method.

[0111] The parametric modeling method provided in this application allows designers to quickly adjust and optimize motor design models by changing parameter values, significantly improving the efficiency of design iterations. It not only enhances the flexibility and reusability of the design, but also reduces human errors and promotes collaborative work in multiple disciplines through automated scripts and custom calculation formulas to be solved. In addition, parametric modeling helps to accurately predict motor performance, cost estimation and adapt manufacturing processes, ensuring that the design results are more in line with actual application needs, thereby significantly improving the efficiency, quality and innovation of motor design work. This method can also realize modeling of other slot-type stator punchings, which can bring breakthrough progress to the field of motor design and achieve more efficient, economical and reliable motor product development.

[0112] The above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A parametric modeling method for an outer rotor permanent magnet synchronous motor, characterized in that: The method comprises: Repeatedly call the modeling modules in the finite element analysis software, which are defined as a stator modeling module and a magnetic steel modeling module respectively; In the stator modeling module, stator design parameters and calculation formulas for parameters to be solved are written, wherein the slot shoulder bottom width, slot bottom width and stator tooth width are geometrically constrained parameters to be solved, and each parameter to be solved is calculated through relevant design parameters; In the magnetic steel modeling module, write magnetic steel parameters and values; The stator modeling module and the magnetic steel modeling module are run to obtain an outer rotor permanent magnet synchronous motor assembly model, wherein the rotor yoke surrounds the outer ring of the stator teeth, and the magnetic steel is located between the rotor yoke and the stator teeth.

2. The parametric modeling method of the outer rotor permanent magnet synchronous motor according to claim 1 is characterized in that: The design process of the calculation formula for the bottom width of the groove shoulder includes: In the isosceles trapezoid formed by the slot opening and the slot shoulder bottom of the stator slot portion, the upper base of the trapezoid is the slot opening width Bs0, the lower base of the trapezoid is the slot shoulder bottom width Bs1, the height of the trapezoid is the slot shoulder height Hs1, and the bottom angle of the trapezoid is the slot shoulder angle α, and Bs0, Hs1 and α are the stator design parameters; According to the geometric relationship of the isosceles trapezoid, the bottom width of the groove shoulder Bs1 is expressed as:

3. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 1 is characterized in that: The design process of the stator tooth width calculation formula includes: Assume that the angle between the center axes of two adjacent stator teeth is the slot pitch angle β, extend the bottom edge CD of the slot shoulder to intersect the center axis of the stator tooth on the side close to point D at point P, draw a perpendicular line through point D to the center axis of the stator tooth and intersect at point H; In the right triangle DHP, DH is half of the stator tooth width, ∠HDP is half of the slot angle β, and the stator tooth width ToothWidth is expressed as: Where SlotNum is the number of stator slots.

4. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 3 is characterized in that: The calculation method for obtaining the PD length includes: Assume that the center axes of two adjacent stator teeth intersect at point O, and the center axis of the stator slot intersects the bottom edge CD of the slot shoulder at point M, then PD = PM-DM, where DM is half of the width Bs1 of the bottom of the slot shoulder; In the right triangle OMP, ∠MOP is half of the slot angle β, then: Wherein, DiaGap1 is the outer diameter of the stator; Hs0 is the slot height, Hs1 is the slot shoulder height, and Hs0 and Hs1 are the stator design parameters.

5. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 2 is characterized in that: The design process of the groove bottom width calculation formula includes: Assume that the angle between the center axes of two adjacent stator teeth is the slot pitch angle β, and the center axis of the stator slot intersects the slot shoulder bottom edge CD and the slot bottom edge at points M and F respectively; in the right-angled trapezoid FMDE formed by the slot shoulder bottom and the slot bottom of the stator slot, a perpendicular line is drawn from the slot bottom end point E to MD and intersects at point G, then FM = Hs2 = EG, EF = MG and is half of the slot bottom width Bs2, where MG = MD-GD, MD is half of the slot shoulder bottom width Bs1, Hs2 is the height from the slot shoulder bottom to the slot bottom, and the slot bottom width Bs2 is expressed as: Bs2=Bs1-2GD.

6. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 5 is characterized in that: The calculation method for obtaining the GD length includes: In the right triangle EGD, ∠GED is half of the slot angle β, then: Where SlotNum is the number of stator slots.

7. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 5 is characterized in that: When the slot shoulder bottom width Bs1 and the slot shoulder angle α in the slot bottom width Bs2 have the same value, the motor stator is an equal tooth width slot type; when the slot shoulder bottom width Bs1 and the slot shoulder angle α in the slot bottom width Bs2 have different values, the motor stator is an unequal tooth width slot type.

8. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 1, characterized in that: The parameters to be solved also include the stator yoke thickness StatorYokeThk and the rotor outer diameter DiaOuter, which are respectively expressed as: DiaOuter=DiaGap1+2AirGap+2MagThk+2RotorYokeThk; In the formula, DiaGap1 is the outer diameter of the stator, DiaStatorYoke is the inner diameter of the stator yoke, Hs0 is the height of the slot in the stator slot, Hs1 is the height of the slot shoulder in the stator slot, Hs2 is the height from the bottom of the slot shoulder to the bottom of the slot, and Rs is the fillet radius of the slot bottom; AirGap is the air gap length between the stator and the magnetic steel, MagThk is the magnetic steel thickness, and RotorYokeThk is the thickness of the rotor yoke; Hs0, Hs1, Hs2, AirGap, MagThk and RotorYokeThk are the stator design parameters.

9. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 8, characterized in that: In the stator modeling module, the stator outer diameter is set to 200mm-210mm, the stator yoke inner diameter is set to 151mm-161mm, and the rotor outer diameter is set to 215mm-229mm. The outer rotor permanent magnet synchronous motor assembly model is modeled within this range.

10. The outer rotor permanent magnet synchronous motor parameter modeling method according to claim 1, characterized in that: The magnetic steel parameters include magnetic steel inner diameter DiaGap2, magnetic steel outer diameter DiaYoke, magnetic steel length and angle information, magnetic steel pole number, semi-axis parameters, and core information; wherein: DiaGap2 = DiaGap1 + 2AirGap; DiaYoke=DiaGap1+2AirGap+2MagThk; In the formula, DiaGap1 is the outer diameter of the stator, AirGap is the air gap length between the stator and the magnetic steel, MagThk is the magnetic steel thickness, and the AirGap and MagThk are the stator design parameters.

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