Method and device for calculating alternating current copper loss of flat wire motor

Abstract

The invention relates to the technical field of motors, in particular to a flat wire motor alternating current copper loss calculation method and device, and the method comprises the steps: obtaining the structure information of a target flat wire motor, and calculating the initial alternating current copper loss of the target flat wire motor based on the structure information and an initial analysis calculation model; calculating a flux density correction factor of the initial analytical calculation model based on the initial alternating current copper loss and at least one flux leakage path of the target flat wire motor; and correcting the initial analytical calculation model by using the flux density correction factor to obtain a corrected analytical calculation model. Therefore, the problems that in the related technology, the balance between calculation efficiency and precision is insufficient, the stator slot magnetic leakage effect is prone to being neglected, adaptability under multiple working conditions is poor, and application and development of the related technology in rapid and diversified design requirements are limited are solved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a method and device for calculating the AC copper loss of a flat wire motor. Background Art

[0002] With the enhancement of global environmental awareness and the rapid development of new energy technologies, under the condition of high-frequency operation of permanent magnet synchronous motors, the AC loss problem of stator windings has become a key factor affecting the motor efficiency and thermal stability. This problem is particularly prominent in flat wire motors. Since the optimized design of the stator slot fill factor can improve the power density of the winding, but a larger conductor cross-sectional area is more susceptible to the skin effect and proximity effect under high-frequency excitation, resulting in significant AC copper losses. Therefore, the calculation of AC copper losses in flat wire motors has become an important research point.

[0003] In related technologies, the slot leakage magnetic field under the action of fundamental current and low-order harmonic currents can be extracted by using a first finite element model, and substituted into a first loss analysis model to calculate the first eddy current loss. Then, the second eddy current loss under the action of the switching harmonic current magnetic field alone can be calculated, and the first and second eddy current losses are added to obtain the AC copper loss; or the transformer parameters required for calculating transformer losses can be calculated according to the finite element method, a three-dimensional model of the transformer can be established on finite element analysis software, and then the circuit interface of the three-dimensional model of the transformer is coupled with the magnetic circuit interface of the three-dimensional model of the transformer to solve the copper loss of the transformer winding.

[0004] However, in related technologies, there is insufficient trade-off between calculation efficiency and accuracy, the stator slot leakage magnetic effect is easily ignored, and the adaptability under multi-condition is poor, thus restricting the application and development of related technologies in fast and diverse design requirements, and there is an urgent need for improvement. Summary of the Invention

[0005] The present application provides a method and device for calculating the AC copper loss of a flat wire motor to solve the problems in related technologies, such as insufficient trade-off between calculation efficiency and accuracy, easy neglect of the stator slot leakage magnetic effect, poor adaptability under multi-condition, thus restricting the application and development of related technologies in fast and diverse design requirements.

[0006] In the first aspect of the embodiments of the present application, a method for calculating the AC copper loss of a flat wire motor is provided, which is applied to the model correction stage. The method includes the following steps: obtaining the structural information of the target flat wire motor, and calculating the initial AC copper loss of the target flat wire motor based on the structural information and an initial analytical calculation model; calculating a magnetic density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor; and using the magnetic density correction factor to correct the initial analytical calculation model to obtain a corrected analytical calculation model.

[0007] Optionally, in an embodiment of the present application, before calculating the initial AC copper loss of the target flat wire motor based on the structure information and the initial analytical calculation model, it further includes: calculating the first AC copper loss of at least one flat wire based on the magnetic flux density of at least one flat wire; determining a target flat wire motor that meets a preset condition based on at least one of the magnetic voltage drop, leakage magnetic flux, and current of the stator of the target flat wire motor in the target flat wire motor; calculating the second AC copper loss of the stator of the target flat wire motor based on the target flat wire motor that meets the preset condition and the first AC copper loss; constructing the initial analytical calculation model based on the second AC copper loss.

[0008] Optionally, in an embodiment of the present application, the calculating the magnetic density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor includes: determining the at least one leakage magnetic path based on the leakage magnetic effect of the stator slot opening of the target flat wire motor, where the at least one leakage magnetic path includes at least one of the leakage magnetic path between conductors in the slot, the leakage magnetic path between adjacent slot openings, and the leakage magnetic path passing through the stator tooth and the air gap; calculating the leakage magnetic conductance corresponding to the leakage magnetic path based on the at least one leakage magnetic path; calculating the magnetic density correction factor based on the leakage magnetic conductance.

[0009] Optionally, in an embodiment of the present application, the expression of the corrected analytical calculation model may but is not limited to:

[0010]

[0011] where K is the magnetic density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I S is the effective value of the current flowing through the conductor, ω e is the electrical frequency of the current, and l is the length of the wire.

[0012] Optionally, in an embodiment of the present application, the expression of the magnetic density correction factor may but is not limited to:

[0013]

[0014] A second aspect embodiment of the present application provides a method for calculating the AC copper loss of a flat wire motor. The method for calculating the AC copper loss of a flat wire motor as described above is applied to the model application stage. Wherein, the method includes the following steps: obtaining the structural information of the actual flat wire motor; calculating the AC copper loss of the actual flat wire motor based on the structural information and a pre-corrected analytical calculation model, where the pre-corrected analytical calculation model is obtained by correcting the initial analytical calculation model with the magnetic flux density correction factor.

[0015] A third aspect embodiment of the present application provides a device for calculating the AC copper loss of a flat wire motor, which is applied to the model correction stage. Wherein, the device includes: a first acquisition module, configured to acquire the structural information of the target flat wire motor and calculate the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model; a first calculation module, configured to calculate the magnetic flux density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor; a correction module, configured to correct the initial analytical calculation model with the magnetic flux density correction factor to obtain a corrected analytical calculation model.

[0016] Optionally, in an embodiment of the present application, it further includes: a second calculation module, configured to calculate the first AC copper loss of at least one flat wire based on the magnetic flux density of at least one flat wire before calculating the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model; a determination module, configured to determine a target flat wire motor that meets a preset condition based on at least one of the magnetic voltage drop, leakage magnetic flux, and current of the stator of the target flat wire motor in the target flat wire motor; a third calculation module, configured to calculate the second AC copper loss of the stator of the target flat wire motor based on the target flat wire motor that meets the preset condition and the first AC copper loss; a construction module, configured to construct the initial analytical calculation model based on the second AC copper loss.

[0017] Optionally, in an embodiment of the present application, the first calculation module includes: a determination unit, configured to determine the at least one leakage magnetic path based on the leakage magnetic effect of the stator slot opening of the target flat wire motor, where the at least one leakage magnetic path includes at least one of the leakage magnetic path between conductors in the slot, the leakage magnetic path between adjacent slot openings, and the leakage magnetic path passing through the stator tooth and the air gap; a first calculation unit, configured to calculate the leakage magnetic conductance corresponding to the leakage magnetic path based on the at least one leakage magnetic path; a second calculation unit, configured to calculate the magnetic flux density correction factor based on the leakage magnetic conductance.

[0018] Optionally, in an embodiment of the present application, the expression of the corrected analytical calculation model may be, but is not limited to:

[0019]

[0020] Among them, K is the magnetic flux density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I S is the effective value of the current flowing through the conductor, ω e is the electrical frequency of the current, and l is the length of the wire.

[0021] Optionally, in an embodiment of the present application, the expression of the magnetic flux density correction factor can be but is not limited to:

[0022]

[0023] An embodiment of the fourth aspect of the present application provides a calculation device for the AC copper loss of a flat wire motor, which is applied to the model application stage. Among them, the device includes: a second acquisition module, configured to acquire the structural information of the actual flat wire motor; a fourth calculation module, configured to calculate the AC copper loss of the actual flat wire motor based on the structural information and a pre-corrected analytical calculation model, where the pre-corrected analytical calculation model is obtained by correcting the initial analytical calculation model with the magnetic flux density correction factor.

[0024] An embodiment of the fifth aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the program to implement the calculation method for the AC copper loss of the flat wire motor as described in the above embodiments.

[0025] An embodiment of the sixth aspect of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the program is executed by a processor, it implements the calculation method for the AC copper loss of the flat wire motor as described above.

[0026] An embodiment of the seventh aspect of the present application provides a computer program product, including a computer program, and when the program is executed, it implements the calculation method for the AC copper loss of the flat wire motor as described above.

[0027] Embodiments of the present application can calculate the initial AC copper loss by obtaining the structural information of the target flat wire motor and combining it with the initial analytical calculation model. Then, according to the initial AC copper loss and at least one leakage magnetic path, the magnetic density correction factor is calculated. Furthermore, the initial analytical calculation model is corrected using the magnetic density correction factor to obtain a corrected analytical calculation model, realizing the modeling of the leakage magnetic effect. While improving the accuracy, the calculation complexity is reduced, providing important technical support for efficient and accurate motor design and optimization. It not only has technical innovation and practicality but also provides a theoretical and practical basis for the performance improvement and energy efficiency optimization of electric vehicle drive motors. Thus, it solves the problems in the related technologies, such as the insufficient trade-off between calculation efficiency and accuracy, the easy neglect of the stator slot leakage magnetic effect, and the poor adaptability under multi-condition conditions, which restricts the application and development of related technologies in fast and diverse design requirements.

[0028] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0030] Figure 1 is a flowchart of a method for calculating the AC copper loss of a flat wire motor according to an embodiment of the present application;

[0031] Figure 2 is a flowchart of constructing an initial analytical calculation model according to an embodiment of the present application;

[0032] Figure 3 is a schematic block diagram of forming a strip loop inside a single flat wire according to an embodiment of the present application;

[0033] Figure 4 is a schematic block diagram of the magnetic field distribution in a parallel slot stator according to an embodiment of the present application;

[0034] Figure 5 is a schematic block diagram of the stator leakage magnetic path analysis according to an embodiment of the present application;

[0035] Figure 6 is a schematic block diagram of a device for calculating the AC copper loss of a flat wire motor according to an embodiment of the present application;

[0036] Figure 7 is a flowchart of a method for calculating the AC copper loss of a flat wire motor according to another embodiment of the present application;

[0037] Figure 8Schematic block diagram of a calculation device for AC copper loss of a flat wire motor provided according to another embodiment of the present application;

[0038] Figure 9 Schematic structural diagram of an electronic device provided according to an embodiment of the present application. Detailed implementation manners

[0039] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0040] The calculation method and device for AC copper loss of a flat wire motor according to an embodiment of the present application will be described below with reference to the drawings. Aiming at the problems of insufficient trade-off between calculation efficiency and accuracy, easy neglect of the stator slot leakage magnetic effect, poor adaptability under multi-condition conditions, and thus limitation of the application and development of related technologies in fast and diverse design requirements mentioned in the above background technology, the present application provides a calculation method for AC copper loss of a flat wire motor. In this method, the structural information of the target flat wire motor can be obtained, and the initial AC copper loss of the target flat wire motor can be calculated in combination with the initial analytical calculation model. Then, according to the initial AC copper loss and at least one leakage magnetic path, the magnetic density correction factor can be calculated, and then the initial analytical calculation model can be corrected by using the magnetic density correction factor to obtain the corrected analytical calculation model, realizing the modeling of the leakage magnetic effect, reducing the calculation complexity while improving the accuracy, providing important technical support for efficient and accurate motor design and optimization, not only having technical innovation and practicality, but also providing a theoretical and practical basis for the performance improvement and energy efficiency optimization of electric vehicle drive motors. Thus, the problems in related technologies, such as insufficient trade-off between calculation efficiency and accuracy, easy neglect of the stator slot leakage magnetic effect, poor adaptability under multi-condition conditions, and thus limitation of the application and development of related technologies in fast and diverse design requirements, are solved.

[0041] Specifically, Figure 1 Flowchart of a calculation method for AC copper loss of a flat wire motor provided according to an embodiment of the present application.

[0042] As Figure 1 shown, the calculation method for AC copper loss of the flat wire motor is applied to the model correction stage, where the method includes the following steps:

[0043] In step S101, obtain the structural information of the target flat wire motor, and calculate the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model.

[0044] It is understandable that the structural information of the target flat wire motor in the embodiments of the present application may but is not limited to include rated power, rated voltage, rated current, inner diameter of the stator, outer diameter of the stator, core length, number of slots, number of poles, slot type dimensions, specifications of the flat wire conductors, winding arrangement methods, etc. Specifically, those skilled in the art can set them according to actual situations, and the present application does not make specific limitations.

[0045] As a possible implementation manner, the embodiments of the present application can calculate the initial AC copper loss according to the obtained structural information of the target flat wire motor and the initial analytical calculation model.

[0046] Optionally, in an embodiment of the present application, before calculating the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model, it further includes: calculating the first AC copper loss of at least one flat wire based on the magnetic flux density of at least one flat wire; determining a target flat wire motor that meets a preset condition based on at least one of the magnetic voltage drop, leakage magnetic flux, and current of the stator of the target flat wire motor in the target flat wire motor; calculating the second AC copper loss of the stator of the target flat wire motor based on the target flat wire motor that meets the preset condition and the first AC copper loss; constructing an initial analytical calculation model based on the second AC copper loss.

[0047] In some embodiments, the content of constructing the initial analytical calculation model in the embodiments of the present application is as Figure 2 shown, and the main steps include:

[0048] Step S201: Calculate the first AC copper loss.

[0049] Among them, as shown in Figure 3 , the embodiments of the present application first consider a single flat wire. A strip-shaped loop is formed inside the conductor. Assuming that the magnetic flux density is evenly distributed and the length of the wire is much greater than other dimensions, that is, l >> d and l >> w. Furthermore, the embodiments of the present application can obtain the first AC copper loss of the conductor caused by the changing magnetic field B x according to Ohm's law and Faraday's law of electromagnetic induction. Its expression can but is not limited to:

[0050]

[0051] where σ is the conductivity of the conductor; T is the change period of the magnetic flux density B x .

[0052] Step S202: Determine a target flat wire motor that meets certain conditions.

[0053] Among them, before constructing the initial analytical calculation model in the embodiments of the present application, some assumptions and approximation conditions involved in the modeling process can be determined first, which can but are not limited to: the magnetic permeability of the stator core is much higher than that of the winding and air, and the magnetic voltage drop of the core can be ignored; the depth of the slot is much larger than the width, and the leakage flux in the y direction can be ignored; the conductors are evenly distributed in the slot, and the current is evenly distributed in the y direction; there are multiple conductors in the stator slot, and the influence of the skin effect can be ignored compared with the proximity effect; the current of the conductors in the stator slot is approximately a sine wave, etc., and the present application does not make specific limitations.

[0054] Furthermore, the embodiments of the present application can obtain a target flat wire motor that meets certain conditions based on these assumptions and approximation conditions, where the certain conditions can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0055] Step S203: Calculate the second AC copper loss.

[0056] Among them, the embodiments of the present application can combine Figure 4 as shown, calculate the second AC copper loss of the flat wires in all the slots of the motor stator, and its content can be:

[0057] First, for the magnetic field in one slot of the motor stator, the embodiments of the present application use the energy method to obtain the average value in the space of the slot, and its expression can but is not limited to:

[0058]

[0059] Among them, μ is the magnetic permeability of the winding, which can be approximated as the vacuum magnetic permeability; N is the number of conductors in one slot; w S is the width of the stator slot.

[0060] Furthermore, the embodiments of the present application can obtain the AC copper loss of the flat wire in one slot, and its expression can but is not limited to:

[0061]

[0062] Among them, d1 is the height of each conductor in the slot.

[0063] Among them, in the embodiments of the present application, it can be assumed that the expression of the current is as shown in the following formula, and its expression can but is not limited to:

[0064]

[0065] Among them, I s is the effective value of the current flowing through the conductor; ω e is the electrical frequency of the current; is the phase of the current.

[0066] Further, after the integral calculation is performed in the embodiment of the present application, the AC copper loss of the rectangular wire in a slot can be obtained, and its expression can be but is not limited to:

[0067]

[0068] Step S204: Construct an initial analytical calculation model.

[0069] Among them, for all slots in the embodiment of the present application, the total AC copper loss can be obtained, and then an initial analytical calculation model is constructed, and its expression can be but is not limited to:

[0070]

[0071] Among them, S is the number of slots of the motor.

[0072] In step S102, based on the initial AC copper loss and at least one leakage magnetic path of the target rectangular wire motor, calculate the magnetic density correction factor of the initial analytical calculation model.

[0073] As a possible implementation manner, the embodiment of the present application can calculate the magnetic density correction factor of the initial analytical calculation model by using the initial AC copper loss and the leakage magnetic path.

[0074] Optionally, in an embodiment of the present application, calculating the magnetic density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target rectangular wire motor includes: determining at least one leakage magnetic path based on the leakage magnetic effect of the stator slot opening of the target rectangular wire motor, where at least one leakage magnetic path includes at least one of the leakage magnetic path between conductors in the slot, the leakage magnetic path between adjacent slot openings, and the leakage magnetic path passing through the stator teeth and the air gap; calculating the leakage magnetic conductance corresponding to the leakage magnetic path based on the at least one leakage magnetic path; calculating the magnetic density correction factor based on the leakage magnetic conductance. Among them, the expression of the magnetic density correction factor can be but is not limited to:

[0075]

[0076] It can be understood that in the embodiment of the present application, the leakage magnetic path can be but is not limited to including the leakage magnetic path between conductors in the slot, the leakage magnetic path between adjacent slot openings, and the leakage magnetic path passing through the stator teeth and the air gap, etc., and the present application does not make specific limitations.

[0077] In some embodiments, the embodiment of the present application can first determine the leakage magnetic path according to the leakage magnetic effect of the stator slot opening of the target rectangular wire motor, and then calculate the leakage magnetic conductance by using the leakage magnetic path, so as to obtain the magnetic density correction factor.

[0078] Exemplarily, in the initial parsing of the calculation model in this application, the conductor loss calculation mainly considers the leakage flux passing through the conductors in the slots. However, the slot opening leakage magnetic effect caused by the slot geometry in the motor cannot be ignored. To more accurately describe the loss, the embodiments of this application analyze the leakage magnetic path in the stator slots.

[0079] Further, if the embodiments of this application incorporate the leakage magnetic effect of the stator slot opening into the analysis, it can be approximately divided into three main leakage magnetic paths, as Figure 5 shown. Among them, path 1 is the leakage magnetic path between the conductors in the slot, and the leakage magnetic conductance of this path is denoted as P1; path 2 is the leakage magnetic path between adjacent slot openings, and the leakage magnetic conductance of this path is denoted as P2; path 3 is the leakage magnetic path passing through the stator tooth and the air gap, and the leakage magnetic conductance of this path is denoted as P3.

[0080] Among them, the calculation formulas for the leakage magnetic conductance of the three leakage magnetic paths P1, P2, and P3 can be but are not limited to:

[0081]

[0082] Among them, μ0 is the vacuum permeability; d wire is the total height (along the radial direction) of the conductor; l is the length of the conductor along the axial direction of the motor in the slot; w slot is the slot width; g air is the air gap; h so is the tip height of the tooth at the opening of the stator slot, w so is the width of the opening of the stator slot.

[0083] Furthermore, the embodiments of this application can assume that the total leakage flux is φ, then the expression of the magnetic flux density can be but is not limited to:

[0084]

[0085] Among them, S wire is the cross-sectional area along the radial direction of the motor of the part where the conductor is embedded in the slot.

[0086] In addition, it should be noted that in the embodiments of this application, the three leakage magnetic paths are in a parallel relationship. It can be considered that these three paths perform parallel shunting on the total leakage flux φ, and the leakage magnetic flux of each path is distributed in direct proportion to its leakage magnetic conductance. Then, the leakage magnetic flux corresponding to the flat wire conductor in the slot can be corrected as shown in the following formula, and its expression can be but is not limited to:

[0087]

[0088] Furthermore, the embodiments of this application can obtain the magnetic flux density corresponding to the flat wire in the slot after correction, and its expression can be but is not limited to:

[0089]

[0090] Furthermore, the embodiments of the present application can obtain a magnetic flux density correction factor, and its expression can be but is not limited to:

[0091]

[0092] In step S103, the initial analytical calculation model is corrected by using the magnetic flux density correction factor to obtain a corrected analytical calculation model. Among them, the expression of the corrected analytical calculation model can be but is not limited to:

[0093]

[0094] where K is the magnetic flux density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I S is the effective value of the current flowing through the conductor, ω x is the electrical frequency of the current, and l is the length of the wire.

[0095] It can be seen from the above analysis that the AC copper loss in the embodiments of the present application is proportional to the square of the magnetic flux density. Therefore, the following relationship exists between the corrected analytical calculation model and the initial analytical calculation model, and its expression can be but is not limited to:

[0096]

[0097] Furthermore, the embodiments of the present application can obtain the total AC copper loss in all slots after correction, so as to obtain a corrected analytical calculation model, and its expression can be but is not limited to:

[0098]

[0099] where K is the magnetic flux density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I S is the effective value of the current flowing through the conductor, ω e is the electrical frequency of the current, and l is the length of the wire.

[0100] Among them,

[0101] ∑P = P1 + P2 + P3.

[0102] According to the calculation method of the AC copper loss of the flat wire motor proposed by the embodiments of the present application, the structural information of the target flat wire motor can be obtained, and the initial AC copper loss can be calculated in combination with the initial analytical calculation model. Then, according to the initial AC copper loss and at least one leakage magnetic path, the magnetic density correction factor can be calculated, and then the initial analytical calculation model can be corrected by using the magnetic density correction factor to obtain the corrected analytical calculation model, realizing the modeling of the leakage magnetic effect, reducing the calculation complexity while improving the accuracy, providing important technical support for efficient and accurate motor design and optimization, not only having technical innovation and practicality, but also providing theoretical and practical basis for the performance improvement and energy efficiency optimization of the electric vehicle drive motor. Thus, the problems in the related technology are solved, such as the insufficient trade-off between calculation efficiency and accuracy, the stator slot leakage magnetic effect is easily ignored, and the adaptability is poor under multi-condition conditions, which limits the application and development of the related technology in the rapid and diversified design requirements.

[0103] Next, a calculation device for the AC copper loss of the flat wire motor proposed by the embodiments of the present application will be described with reference to the accompanying drawings.

[0104] Figure 6 FIG. is a block diagram of a calculation device for the AC copper loss of a flat wire motor provided according to an embodiment of the present application.

[0105] As Figure 6 shown, the calculation device 60 for the AC copper loss of the flat wire motor is applied to the model correction stage. Among them, the device 60 includes: a first acquisition module 601, a first calculation module 602, and a correction module 603.

[0106] Among them, the first acquisition module 601 is configured to acquire the structural information of the target flat wire motor and calculate the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model.

[0107] The first calculation module 602 is configured to calculate the magnetic density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor.

[0108] The correction module 603 is configured to correct the initial analytical calculation model by using the magnetic density correction factor to obtain a corrected analytical calculation model.

[0109] Optionally, in an embodiment of the present application, it further includes: a second calculation module, a determination module, a third calculation module, and a construction module.

[0110] Among them, the second calculation module is configured to calculate the first AC copper loss of at least one flat wire based on the magnetic flux density of at least one flat wire before calculating the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model.

[0111] A determination module, configured to determine a target rectangular wire motor that meets a preset condition based on at least one of the magnetic voltage drop, leakage magnetic flux, and current of the target rectangular wire motor stator in the target rectangular wire motor.

[0112] A third calculation module, configured to calculate a second AC copper loss of the target rectangular wire motor stator based on the target rectangular wire motor that meets the preset condition and the first AC copper loss.

[0113] A construction module, configured to construct an initial analytical calculation model based on the second AC copper loss.

[0114] Optionally, in an embodiment of the present application, the first calculation module 602 includes: a determination unit, a first calculation unit, and a second calculation unit.

[0115] Wherein, the determination unit is configured to determine at least one leakage magnetic path based on the leakage magnetic effect of the target rectangular wire motor stator slot opening, and at least one leakage magnetic path includes at least one of a leakage magnetic path between conductors in the slot, a leakage magnetic path between adjacent slot openings, and a leakage magnetic path passing through the stator tooth and the air gap.

[0116] The first calculation unit is configured to calculate the leakage magnetic conductance corresponding to the leakage magnetic path based on at least one leakage magnetic path.

[0117] The second calculation unit is configured to calculate a magnetic density correction factor based on the leakage magnetic conductance.

[0118] Optionally, in an embodiment of the present application, the expression of the corrected analytical calculation model may but is not limited to:

[0119]

[0120] Wherein, K is the magnetic density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I s is the effective value of the current flowing through the conductor, ω e is the electrical frequency of the current, and l is the length of the wire.

[0121] Optionally, in an embodiment of the present application, the expression of the magnetic density correction factor may but is not limited to:

[0122]

[0123] It should be noted that the foregoing explanation of the embodiment of the calculation method of the AC copper loss of the rectangular wire motor also applies to the calculation device of the AC copper loss of the rectangular wire motor in this embodiment, and will not be elaborated here.

[0124] The calculation device for the AC copper loss of the flat wire motor proposed according to the embodiments of the present application can calculate the initial AC copper loss by obtaining the structural information of the target flat wire motor and combining the initial analytical calculation model, and then calculate the magnetic density correction factor based on the initial AC copper loss and at least one leakage magnetic path, and then use the magnetic density correction factor to correct the initial analytical calculation model to obtain a corrected analytical calculation model, realizing the modeling of the leakage magnetic effect, reducing the calculation complexity while improving the accuracy, providing important technical support for efficient and accurate motor design and optimization, not only having technical innovation and practicability, but also providing a theoretical and practical basis for the performance improvement and energy efficiency optimization of the electric vehicle drive motor. Thus, the problems in the related art are solved, such as the insufficient trade-off between calculation efficiency and accuracy, the easy neglect of the stator slot leakage magnetic effect, and the poor adaptability under multi-condition conditions, which limit the application and development of the related technology in the rapid and diverse design requirements.

[0125] The above embodiments describe the model correction stage. The embodiments of the model application stage will be described below.

[0126] Figure 7 It is a flowchart of a calculation method for the AC copper loss of a flat wire motor provided according to another embodiment of the present application.

[0127] As Figure 7 shown, the calculation method for the AC copper loss of the flat wire motor is applied to the model application stage, and the method includes the following steps:

[0128] In step S701, obtain the structural information of the actual flat wire motor.

[0129] In step S702, based on the structural information and the pre-corrected analytical calculation model, calculate the AC copper loss of the actual flat wire motor, where the pre-corrected analytical calculation model is obtained by correcting the initial analytical calculation model with the magnetic density correction factor.

[0130] Those skilled in the art can understand that the embodiments of the present application can combine the obtained structural information of the actual flat wire motor with the pre-corrected analytical calculation model to obtain the AC copper loss of the actual flat wire motor.

[0131] According to the calculation method of AC copper loss of the flat wire motor proposed in the embodiments of the present application, the AC copper loss of the actual flat wire motor can be calculated by obtaining the structural information of the actual flat wire motor and the pre-corrected analytical calculation model, realizing the modeling of the leakage magnetic effect, reducing the calculation complexity while improving the accuracy, providing important technical support for efficient and accurate motor design and optimization, not only having technical innovation and practicability, but also providing theoretical and practical basis for the performance improvement and energy efficiency optimization of the electric vehicle drive motor. Thus, the problems in the related art are solved, such as the insufficient trade-off between calculation efficiency and accuracy, the easy neglect of the stator slot leakage magnetic effect, and the poor adaptability under multi-condition conditions, which limits the application and development of the related technology in the rapid and diversified design requirements.

[0132] Next, the calculation device of the AC copper loss of the flat wire motor proposed in the embodiments of the present application will be described with reference to the accompanying drawings.

[0133] Figure 8 It is a block diagram of the calculation device of the AC copper loss of the flat wire motor provided in another embodiment of the present application.

[0134] As Figure 8 shown, the calculation device 80 of the AC copper loss of the flat wire motor is applied to the model application stage. Among them, the device 80 includes: a second acquisition module 801 and a fourth calculation module 802.

[0135] Specifically, the second acquisition module 801 is used to acquire the structural information of the actual flat wire motor.

[0136] The fourth calculation module 802 is used to calculate the AC copper loss of the actual flat wire motor based on the structural information and the pre-corrected analytical calculation model, where the pre-corrected analytical calculation model is obtained by correcting the initial analytical calculation model with a magnetic density correction factor.

[0137] It should be noted that the foregoing explanation of the embodiments of the calculation method of the AC copper loss of the flat wire motor also applies to the calculation device of the AC copper loss of the flat wire motor in this embodiment, and will not be elaborated here.

[0138] The calculation device for the AC copper loss of the flat wire motor according to the embodiments of the present application can calculate the AC copper loss of the actual flat wire motor by obtaining the structural information of the actual flat wire motor and the pre-corrected analytical calculation model, realizing the modeling of the leakage magnetic effect, reducing the calculation complexity while improving the accuracy, providing important technical support for efficient and accurate motor design and optimization, not only having technical innovation and practicality, but also providing theoretical and practical basis for the performance improvement and energy efficiency optimization of the electric vehicle drive motor. Thus, it solves the problems in the related technologies, such as the insufficient trade-off between calculation efficiency and accuracy, the easy neglect of the stator slot leakage magnetic effect, and the poor adaptability under multi-condition conditions, which limits the application and development of the related technologies in the rapid and diverse design requirements.

[0139] Figure 9 It is a schematic structural diagram of an electronic device provided according to an embodiment of the present application. The electronic device may include:

[0140] A memory 901, a processor 902, and a computer program stored on the memory 901 and executable on the processor 902.

[0141] When the processor 902 executes the program, it implements the calculation method for the AC copper loss of the flat wire motor provided in the above embodiment.

[0142] Further, the electronic device further includes:

[0143] A communication interface 903 for communication between the memory 901 and the processor 902.

[0144] The memory 901 is used to store the computer program executable on the processor 902.

[0145] The memory 901 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0146] If the memory 901, the processor 902, and the communication interface 903 are implemented independently, the communication interface 903, the memory 901, and the processor 902 can be interconnected through a bus and complete communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of representation, Figure 9It is represented by only a thick line, but it does not mean that there is only one bus or one type of bus.

[0147] Optionally, in a specific implementation, if the memory 901, the processor 902, and the communication interface 903 are integrated on a chip, the memory 901, the processor 902, and the communication interface 903 can communicate with each other through an internal interface.

[0148] The processor 902 may be a central processing unit (CPU for short), or an application specific integrated circuit (ASIC for short), or one or more integrated circuits configured to implement the embodiments of the present application.

[0149] The embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the calculation method of the AC copper loss of the flat wire motor as described above is implemented.

[0150] The embodiments of the present application also provide a computer program product, including a computer program, and when the program is executed, the calculation method of the AC copper loss of the flat wire motor as described above is implemented.

[0151] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0152] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0153] Any process or method description represented in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logic function or process. The scope of the preferred embodiments of the present application includes additional implementations, where functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0154] The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered a sequenced list of executable instructions for implementing a logical function, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or N wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, a computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0155] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

[0156] Those of ordinary skill in the art can understand that all or part of the steps carried out in implementing the above-described embodiment methods can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0157] In addition, in each of the embodiments of the present application, the various functional units can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0158] The above-mentioned storage medium can be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A calculation method for the AC copper loss of a flat wire motor, characterized in that, Applied to the model correction stage, where the method includes the following steps: Obtain the structural information of the target flat wire motor, and calculate the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model; Calculate the magnetic flux density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor; Use the magnetic flux density correction factor to correct the initial analytical calculation model to obtain a corrected analytical calculation model.

2. The method according to claim 1, wherein Before calculating the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model, it further includes: Calculate the first AC copper loss of at least one flat wire based on the magnetic flux density of at least one flat wire; Determine a target flat wire motor that meets a preset condition based on at least one of the magnetic voltage drop, leakage magnetic flux, and current of the stator of the target flat wire motor in the target flat wire motor; Calculate the second AC copper loss of the stator of the target flat wire motor based on the target flat wire motor that meets the preset condition and the first AC copper loss; Construct the initial analytical calculation model based on the second AC copper loss.

3. The method according to claim 2, wherein The calculating the magnetic flux density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor includes: Determine the at least one leakage magnetic path based on the leakage magnetic effect of the stator slot opening of the target flat wire motor, where the at least one leakage magnetic path includes at least one of the leakage magnetic path between conductors in the slot, the leakage magnetic path between adjacent slot openings, and the leakage magnetic path passing through the stator teeth and the air gap; Calculate the leakage magnetic conductance corresponding to the leakage magnetic path based on the at least one leakage magnetic path; Calculate the magnetic flux density correction factor based on the leakage magnetic conductance.

4. The method according to claim 1, wherein The expression of the corrected analytical calculation model is: Among them, K is the magnetic flux density correction factor, μ is the magnetic permeability of the winding, N is the number of conductors in one slot, w S is the stator slot width, σ is the conductivity of the conductor, d1 is the height of each conductor in the slot, I S is the effective value of the current flowing through the conductor, ω e is the electrical frequency of the current, and l is the length of the wire.

5. The method according to claim 1, wherein The expression of the magnetic flux density correction factor is:

6. A calculation method for the AC copper loss of a flat wire motor, characterized in that, Adopt the calculation method of the AC copper loss of the flat wire motor as described in any one of claims 1-5 above, and apply it to the model application stage, where the method includes the following steps: Obtain the structural information of the actual flat wire motor; Calculate the AC copper loss of the actual flat wire motor based on the structural information and the pre-corrected analytical calculation model, where the pre-corrected analytical calculation model is obtained by correcting the initial analytical calculation model with the magnetic flux density correction factor.

7. A calculation device for AC copper loss of a flat wire motor, characterized in that, Applied to the model correction stage, where the device includes: The first acquisition module is used to obtain the structural information of the target flat wire motor, and calculate the initial AC copper loss of the target flat wire motor based on the structural information and the initial analytical calculation model; The first calculation module is used to calculate the magnetic flux density correction factor of the initial analytical calculation model based on the initial AC copper loss and at least one leakage magnetic path of the target flat wire motor; The correction module is used to correct the initial analytical calculation model with the magnetic flux density correction factor to obtain a corrected analytical calculation model.

8. A calculation device for the AC copper loss of a flat wire motor, characterized in that, Applied to the model application stage, where the device includes: The second acquisition module is used to obtain the structural information of the actual flat wire motor; A fourth calculation module, configured to calculate the AC copper loss of the actual rectangular wire motor based on the structure information and a pre-corrected analytical calculation model, wherein the pre-corrected analytical calculation model is obtained by correcting an initial analytical calculation model with a magnetic flux density correction factor.

9. An electronic device, characterized in that, Comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the method for calculating the AC copper loss of a rectangular wire motor according to any one of claims 1-5 or the method for calculating the AC copper loss of a rectangular wire motor according to claim 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to be used for implementing the method for calculating the AC copper loss of a rectangular wire motor according to any one of claims 1-5 or the method for calculating the AC copper loss of a rectangular wire motor according to claim 6.

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