A method for obtaining high-frequency impedance parameters of motors based on numerical simulation

Abstract

The present invention discloses a method for obtaining the high-frequency impedance parameters of a motor based on numerical simulation. This method employs a "whole prototype - segmented simulation - decomposition calculation - re-calculation" process. The motor prototype is decomposed into three simulation spaces: the front end winding emission space, the rear end winding emission space, and the main winding emission space. The resistance, inductance, and capacitance parameters of the high-frequency impedance are simulated and calculated for each simulation space. A multi-conductor decomposition calculation model is then used to obtain the resistance, inductance, and capacitance parameters of the single-conductor high-frequency impedance for each simulation space. Finally, the resistance, inductance, and capacitance parameters of the multi-turn high-frequency impedance are re-calculated based on the high-frequency impedance external winding connection model. Compared with existing technologies, the present method not only quickly and accurately obtains the high-frequency impedance parameters of the motor, but also provides model parameters for comprehensive analysis of system electromagnetic compatibility signals before prototype manufacturing.

Description

Technical Field

[0001] The present invention relates to a method for obtaining high-frequency impedance parameters of a motor, in particular to a method for obtaining high-frequency impedance parameters of a motor based on numerical simulation. Background Art

[0002] Currently, there are two known methods for obtaining high-frequency impedance parameters of a motor.

[0003] The first method for obtaining the motor's high-frequency impedance parameters is through testing with an impedance tester. This method requires obtaining a motor prototype and connecting the motor windings to the impedance tester according to the impedance requirements. The impedance tester then inputs voltage signals of varying frequencies into the motor windings, detects the current signal and phase deviation, and calculates the impedance from the voltage and current signals to obtain the motor's high-frequency impedance parameters. However, this testing method can only be performed after the motor prototype has been manufactured. It cannot provide the motor's high-frequency impedance parameters during the motor design phase, nor can it perform comprehensive electromagnetic compatibility signal analysis during the electromechanical system design phase.

[0004] The second method for obtaining the high-frequency impedance parameters of a motor is through simulation of a high-frequency electromagnetic field model in three-dimensional space. This method applies a set of high-frequency electromagnetic field differential equations and weak solution equations to the three-dimensional model of the motor and its surrounding environment. It uses a discretized grid method and a giant matrix iterative solution method to simulate the interaction between the high-frequency circuit and the high-frequency electromagnetic field and calculate the high-frequency impedance of the coil. This method uses a huge number of grids, often millions of grids, and the calculation is slow, the solution converges poorly, and the calculation accuracy is limited, which can easily lead to distorted results. In addition, motor windings are generally composed of dozens or hundreds of wires, and the three-dimensional model has difficulty converging to fully simulate such multi-turn coils, which makes it difficult to simulate the impedance characteristics of multi-turn coils. Summary of the Invention

[0005] In order to overcome the deficiency that existing high-frequency electromagnetic field numerical simulation cannot quickly and accurately obtain the high-frequency impedance parameters of the motor, the purpose of the present invention is to provide a method for obtaining the high-frequency impedance parameters of the motor based on numerical simulation. This method can not only quickly and accurately obtain the high-frequency impedance parameters of the motor, but also provide model parameters for the comprehensive analysis of the system electromagnetic compatibility signal before prototype manufacturing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for obtaining high-frequency impedance parameters of a motor based on numerical simulation, wherein the overall prototype of the motor is decomposed into three simulation spaces according to the superposition of circuits and the radiation characteristics of the magnetic field; the resistance, inductance, and capacitance parameters of the high-frequency impedance are then simulated and calculated for each simulation space; the resistance, inductance, and capacitance parameters of the single-conductor high-frequency impedance of each simulation space are then obtained using a multi-conductor decomposition calculation model; finally, the resistance, inductance, and capacitance parameters of the multi-turn high-frequency impedance of each simulation space are re-calculated based on the high-frequency impedance external winding connection model; wherein the resistance value of the same-phase conductor in each simulation space is decomposed and re-assembled using a series model, the inductance value is decomposed and re-assembled using a series model, and the capacitance value is decomposed and re-assembled using a parallel model.

[0008] Furthermore, a method of obtaining high-frequency impedance parameters of a motor based on numerical simulation of the present invention is implemented by the following steps:

[0009] S1: Segmented simulation

[0010] The motor prototype is decomposed into three simulation spaces according to the superposition of circuits and the radiation characteristics of the magnetic field. These are the front-end winding emission space corresponding to the front-end winding of the motor, the rear-end winding emission space corresponding to the rear-end winding of the motor, and the main winding emission space corresponding to the main winding of the motor. The main winding emission space is simulated using a reduced-order two-dimensional equivalent simulation model, and the front-end winding emission space and the rear-end winding emission space are simulated using a three-dimensional high-frequency electromagnetic field simulation model simplified to a single conductor.

[0011] S2: Decomposition calculation

[0012] The simulation results of each segment of the simulation space are decomposed, and the single conductor resistance R of each phase in each segment of the simulation space is decomposed by the following formulas (1), (2) and (3): t , single conductor inductance L t and single conductor capacitance C t ;

[0013]

[0014]

[0015] C t =N t C w Formula (3)

[0016] Among them, R w Represents the series resistance of multiple conductors in the same simulation space, L w Represents the multi-conductor series inductance in the same simulation space, C w Represents the capacitance of multiple conductors in series within the same simulation space, N tis the number of turns of multiple conductors; among them, the simulation model of the main winding emission space has been simulated as a single conductor, and its number of turns N t Considered as 1;

[0017] S3: Reorganization calculation

[0018] The single conductor resistance R of each phase in each segment of the simulation space t , single conductor inductance L t and single conductor capacitance C t Recalculate according to the following formulas (4), (5) and (6) respectively. At this time, the actual number of turns N of the motor winding needs to be applied. t Calculate and obtain the high-frequency resistance R of the motor prototype. s , the high-frequency inductor L of the overall motor prototype s And the high-frequency capacitor C of the motor prototype p ;

[0019] R s =N t F s (R t ) Formula (4)

[0020]

[0021]

[0022] Among them, F s (R t ) represents the connection calculation function of high-frequency resistance, F s (L t ) represents the connection calculation function of high-frequency inductance, F P (C t ) represents the connection calculation function of high-frequency capacitors, F s (R t ), F s (L t ) and F P (C t ) Use the corresponding calculation formula based on the external wiring and internal wiring of the high-frequency impedance.

[0023] Furthermore, the internal wiring of the motor prototype adopts a three-phase star winding, and the external wiring of the differential mode high-frequency impedance is VW two-phase parallel connection, and U phase is connected in series with VW through the neutral point. At this time, F s (R t ), F s (L t ) and F P (C t ) are calculated as formula (7), formula (8) and formula (9) respectively;

[0024]

[0025]

[0026]

[0027] Among them, Σ represents the sum of the corresponding parameters of each segment of the simulation space, that is, the sum of Σ is the corresponding parameters of each segment of the simulation space, and the sum of Σ is the sum of the corresponding parameters of each segment of the simulation space; R t·U Represents R calculated in phase U t , R t·V Represents the R calculated in V phase t , R t·W Represents R calculated in W phase t ;L t·U Represents the L calculated in the U phase t , L t·V Represents the L calculated in V phase t , L t·W Represents the L calculated in W phase t ; C t·U represents the Ct calculated at the U phase, Ct·V represents the Ct calculated at the V phase, and Ct·W represents the Ct calculated at the W phase.

[0028] After adopting the above scheme, the present invention provides a method for obtaining the high-frequency impedance parameters of a motor based on numerical simulation. The method adopts the process of "overall prototype - segmented simulation - decomposition calculation - re-calculation" to decompose the overall motor prototype into three simulation spaces: the front end winding emission space, the rear end winding emission space, and the main winding emission space. The resistance, inductance, and capacitance parameters of the high-frequency impedance are simulated and calculated for each simulation space. Then, a multi-conductor decomposition calculation model is used to obtain the resistance, inductance, and capacitance parameters of the single-conductor high-frequency impedance of each simulation space. Finally, the resistance, inductance, and capacitance parameters of the multi-turn winding high-frequency impedance are re-calculated based on the high-frequency impedance external winding connection model. Compared with the existing technology, the method of the present invention can not only quickly and accurately obtain the high-frequency impedance parameters of the motor, but also provide model parameters for comprehensive analysis of system electromagnetic compatibility signals before prototype manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the workflow of the present invention;

[0030] Figure 2 This is an axial view of the overall prototype of the motor of the present invention;

[0031] Figure 3 A longitudinal cross-sectional view of the overall prototype of the motor of the present invention;

[0032] Figure 4 A schematic diagram of a segmented simulation of the overall prototype of the motor in the present invention;

[0033] Figure 5 The winding simulation wiring diagram of the overall prototype of the motor in the present invention;

[0034] Figure 6 This is a simulated wiring diagram of the windings of the overall prototype of the motor in the present invention (the motor housing is omitted);

[0035] Figure 7 This is a schematic structural diagram of the front-end winding emission space in the present invention;

[0036] Figure 8 This is a winding simulation wiring diagram of the front-end winding emission space in the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the main winding emission space in the present invention;

[0038] Figure 10 This is a winding simulation wiring diagram of the main winding emission space in the present invention;

[0039] Figure 11 This is a schematic structural diagram of the rear-end winding emission space in the present invention;

[0040] Figure 12 This is a winding simulation wiring diagram of the rear-end winding emission space in the present invention;

[0041] Figure 13 Schematic diagram of winding decomposition calculation of the front-end winding emission space in the present invention;

[0042] Figure 14 Schematic diagram of winding decomposition calculation of the main winding emission space in the present invention;

[0043] Figure 15 Schematic diagram of winding decomposition calculation of rear-end winding emission space in the present invention;

[0044] In the figure: 1-motor housing; 2-motor shaft; 3-stator core; 4-stator winding; 5-rotor; 6-front winding emission space; 7-main winding emission space; 8-rear winding emission space; 4a-front winding; 4b-main winding; 4c-rear winding; U, V, W are the lead wires of each phase of the motor stator winding, and N is the neutral point of the motor stator winding. DETAILED DESCRIPTION

[0045] The present invention provides a method for obtaining motor high-frequency impedance parameters based on numerical simulation, such as Figure 1As shown in the figure, the overall prototype of the motor is decomposed into three simulation spaces according to the superposition of circuits and the radiation characteristics of the magnetic field; then the resistance, inductance, and capacitance parameters of the high-frequency impedance of each simulation space are simulated and calculated respectively; then the multi-conductor decomposition calculation model is used to obtain the resistance, inductance, and capacitance parameters of the single-conductor high-frequency impedance of each simulation space; finally, the resistance, inductance, and capacitance parameters of the multi-turn winding high-frequency impedance of each simulation space are reorganized and calculated according to the high-frequency impedance external winding connection model; among them, the resistance value of the in-phase wire in each simulation space is decomposed and reorganized using a series model, the inductance value is decomposed and reorganized using a series model, and the capacitance value is decomposed and reorganized using a parallel model.

[0046] Furthermore, a method of obtaining high-frequency impedance parameters of a motor based on numerical simulation of the present invention is implemented by the following steps:

[0047] S1: Segmented simulation

[0048] like Figure 1-12 As shown, the overall motor prototype includes a motor housing 1, a motor shaft 2, a stator core 3, a stator winding 4, and a rotor 5. The overall motor prototype is decomposed into three simulation spaces based on the superposition of circuits and the radiation characteristics of the magnetic field. These are the front-end winding emission space 6 corresponding to the front-end winding 4a of the motor, the main winding emission space 7 corresponding to the main body winding 4b of the motor, and the rear-end winding emission space 8 corresponding to the rear-end winding 4c of the motor. The main winding emission space 7 is simulated using a reduced-order two-dimensional equivalent simulation model, while the front-end winding emission space 6 and the rear-end winding emission space 8 are simulated using three-dimensional high-frequency electromagnetic field simulation models simplified to a single conductor.

[0049] S2: Decomposition calculation

[0050] In the present invention, the calculation formulas used in each segment of the simulation space are the same. In this embodiment, the following formulas are common to each segment of the simulation space;

[0051] like Figure 13-15 As shown, the simulation results of each segment of the simulation space are decomposed, and the single conductor resistance R of each phase in each segment of the simulation space is decomposed by the following formulas (1), (2) and (3): t , single conductor inductance L t and single conductor capacitance C t ;

[0052]

[0053]

[0054] C t =N t C w Formula (3)

[0055] Among them, R w Represents the series resistance of multiple conductors in the same simulation space, L w Represents the multi-conductor series inductance in the same simulation space, C w Represents the capacitance of multiple conductors in series within the same simulation space, N t is the number of turns of multiple conductors; among them, the simulation model of the main winding emission space has been simulated as a single conductor, and its number of turns N t Considered as 1;

[0056] S3: Reorganization calculation

[0057] The single conductor resistance R of each phase in each segment of the simulation space t , single conductor inductance L t and single conductor capacitance C t Recalculate according to the following formulas (4), (5) and (6) respectively. At this time, the actual number of turns N of the motor winding needs to be applied. t Calculate and obtain the high-frequency resistance R of the motor prototype. s , the high-frequency inductor L of the overall motor prototype s And the high-frequency capacitor C of the motor prototype p ;

[0058] R s =N t F s (R t ) Formula (4)

[0059]

[0060]

[0061] Among them, F s (R t ) represents the connection calculation function of high-frequency resistance, F s (L t ) represents the connection calculation function of high-frequency inductance, F P (C t ) represents the connection calculation function of high-frequency capacitors, F s (R t ), F s (L t ) and F P (C t ) Use the corresponding calculation formula based on the external wiring and internal wiring of the high-frequency impedance.

[0062] As a specific embodiment, in the present invention, the internal wiring of the motor prototype adopts a three-phase star winding, the external wiring of the differential mode high-frequency impedance is VW two-phase parallel connection, U phase is connected in series with VW through the neutral point N, at this time F s (R t ), F s (L t ) and F P (C t ) are calculated as formula (7), formula (8) and formula (9) respectively;

[0063]

[0064]

[0065]

[0066] Among them, Σ represents the summation of the corresponding parameters of each segment of the simulation space, that is, the summation content of Σ is the corresponding parameters of each segment of the simulation space, and the summation result of Σ is the sum of the corresponding parameters of each segment of the simulation space; Rt·U represents the Rt calculated in the U phase, Rt·V represents the Rt calculated in the V phase, and Rt·W represents the Rt calculated in the W phase; Lt·U represents the Lt calculated in the U phase, Lt·V represents the Lt calculated in the V phase, and Lt·W represents the Lt calculated in the W phase; Ct·U represents the Ct calculated in the U phase, Ct·V represents the Ct calculated in the V phase, and Ct·W represents the Ct calculated in the W phase.

[0067] After adopting the above scheme, the present invention provides a method for obtaining the high-frequency impedance parameters of a motor based on numerical simulation. The method adopts the process of "overall prototype - segmented simulation - decomposition calculation - re-calculation" to decompose the overall motor prototype into three simulation spaces: the front end winding emission space, the rear end winding emission space, and the main winding emission space. The resistance, inductance, and capacitance parameters of the high-frequency impedance are simulated and calculated for each simulation space. Then, a multi-conductor decomposition calculation model is used to obtain the resistance, inductance, and capacitance parameters of the single-conductor high-frequency impedance of each simulation space. Finally, the resistance, inductance, and capacitance parameters of the multi-turn winding high-frequency impedance are re-calculated based on the high-frequency impedance external winding connection model. Compared with the existing technology, the method of the present invention can not only quickly and accurately obtain the high-frequency impedance parameters of the motor, but also provide model parameters for comprehensive analysis of system electromagnetic compatibility signals before prototype manufacturing.

[0068] The above description is only a preferred embodiment of this embodiment, and all equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for obtaining high-frequency impedance parameters of a motor based on numerical simulation, characterized by: The overall motor prototype is decomposed into three simulation spaces according to the superposition of circuits and the radiation characteristics of the magnetic field; then, the resistance, inductance, and capacitance parameters of the high-frequency impedance of each simulation space are simulated and calculated respectively; then, the resistance, inductance, and capacitance parameters of the high-frequency impedance of a single conductor in each simulation space are obtained respectively using a multi-conductor decomposition calculation model; finally, the resistance, inductance, and capacitance parameters of the high-frequency impedance of the multi-turn winding in each simulation space are re-calculated according to the high-frequency impedance external winding connection model; among them, the resistance value of the in-phase conductor in each simulation space is decomposed and re-calculated using a series model, the inductance value is decomposed and re-calculated using a series model, and the capacitance value is decomposed and re-calculated using a parallel model; Specifically, it is achieved through the following steps: S1: Segmented simulation The motor prototype is decomposed into three simulation spaces according to the superposition of circuits and the radiation characteristics of the magnetic field. These are the front-end winding emission space corresponding to the front-end winding of the motor, the rear-end winding emission space corresponding to the rear-end winding of the motor, and the main winding emission space corresponding to the main winding of the motor. The main winding emission space is simulated using a reduced-order two-dimensional equivalent simulation model, and the front-end winding emission space and the rear-end winding emission space are simulated using a three-dimensional high-frequency electromagnetic field simulation model simplified to a single conductor. S2: Decomposition calculation The simulation results of each segment of the simulation space are decomposed, and the single conductor resistance of each phase in each segment of the simulation space is decomposed by the following formulas (1), (2) and (3): R t , single conductor inductance L t and single conductor capacitance C t ; Formula (1) Formula (2) Formula (3) in, R w Represents the series resistance of multiple conductors in the same simulation space, L w Represents the multi-conductor series inductance in the same simulation space, C w Represents the capacitance of multiple conductors in series within the same simulation space. N t is the number of turns of multiple conductors; among them, the simulation model of the main winding emission space has been simulated as a single conductor, and its number of turns is N t Considered as 1; S3: Reorganization calculation The single conductor resistance of each phase in each segment of simulation space R t 、 Single conductor inductor L t and single conductor capacitance C t Recalculate according to the following formulas (4), (5) and (6), respectively. At this time, the actual number of turns of the motor winding needs to be applied. N t Calculate and obtain the high-frequency resistance of the motor prototype R s , high-frequency inductance of the overall motor prototype L s And the high-frequency capacitor of the motor prototype C p ； Formula (4) Formula (5) Formula (6) in, F s ( R t ) represents the connection calculation function of high-frequency resistance, F s ( L t ) represents the connection calculation function of high-frequency inductance, F P ( C t ) represents the connection calculation function of high-frequency capacitors, F s ( R t )、 F s ( L t )and F P ( C t ) Use the corresponding calculation formula based on the external and internal wiring of the high-frequency impedance; Among them, the internal wiring of the motor prototype adopts three-phase star winding, the external wiring of the differential mode high-frequency impedance is VW two-phase parallel connection, and U phase is connected in series with VW through the neutral point. F s ( R t )、 F s ( L t )and F P ( C t ) are calculated as formula (7), formula (8) and formula (9) respectively; Formula (7) Formula (8) Formula (9) Wherein, Σ represents the sum of the corresponding parameters of each segment of the simulation space, that is, the sum of Σ is the corresponding parameters of each segment of the simulation space, and the sum of Σ is the sum of the corresponding parameters of each segment of the simulation space; Rt·U Represents the calculated value in phase U Rt , Rt·V Represents the calculated value in V phase Rt , Rt·W Represents the calculated value in W phase Rt ; Lt U Represents the calculated value in phase U Lt , Lt·V Represents the calculated value in V phase Lt , Lt.W Represents the calculated value in W phase Lt ; Ct·U Represents the calculated value in phase U Ct , Ct·V Represents the calculated value in V phase Ct , Ct·W Represents the calculated value in W phase Ct.

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