A synchronous motor high-efficiency interval design method, device and equipment

Abstract

The application provides a synchronous motor high-efficiency interval design method, device and equipment. The scheme firstly determines the influence direction of the influence parameters of a synchronous motor on the highest efficiency point of the synchronous motor, and divides the influence parameters into a plurality of influence parameter groups based on the different influence directions. In the motor design process, when the highest efficiency point of the motor corresponding to the initial influence parameters does not meet the design requirements, the direction required to move the highest efficiency point is obtained, the target parameters required to be adjusted are determined based on the moving direction and the influence parameter groups, and the values of the target parameters in the initial influence parameters are adjusted, so that the highest efficiency point of the motor can meet the design requirements quickly, thereby realizing the rapid calibration of the design parameters of the synchronous motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a method, apparatus, and equipment for designing high-efficiency ranges for synchronous motors. Background Technology

[0002] Electric motors play a vital role in people's daily lives and production, and their efficiency directly affects the power and energy conversion efficiency of the entire system. In practical motor design and development, we require that the high-efficiency range of the motor encompass its commonly used operating points as much as possible to reduce the motor's energy consumption per 100 kilometers. On the other hand, we require that the motor's size, especially its axial length, be as small as possible to meet the space requirements of different application scenarios. For motors with differentiated advantages, a wide high-efficiency range and a small axial length are both essential aspects. Compared with surface-mounted permanent magnet synchronous motors, V-type motors can fully utilize reluctance torque, thereby improving the motor's output capacity. Compared with complex double-V and V+1 type motors, V-type motors have less magnetic leakage and are easier and cheaper to manufacture, thus they are widely used in practical motor development. Motors have many performance parameters, and many factors affect their performance. The influence of each parameter is interdependent, meaning that "a change in one affects the whole." Considering the commonly used operating points of the motor and achieving targeted development of the high-efficiency range is both a challenge and a key point in motor design.

[0003] The location of a motor's high-efficiency zone can be characterized by the geometric centroid of its efficiency contour plot. Achieving directional movement of this geometric centroid is a key focus and challenge in motor development. Research has found that the point of maximum efficiency often coincides with the geometric centroid of the high-efficiency zone, thus the location of this point can be used to characterize the high-efficiency zone. Currently, research in this area is relatively limited. US20210167652A1 proposes a method for adjusting the high-efficiency zone of a motor. This patent first reveals the intrinsic relationship between the point of maximum efficiency and its surrounding points. Based on the principle that the point of maximum efficiency occurs at the optimal combination of copper losses, iron losses, and permanent magnet eddy current losses, this method is applicable to electric vehicles, allowing the high-efficiency zone to be aligned with the electric vehicle's driving cycle, thereby reducing energy consumption.

[0004] The above patents are based on complex theoretical calculations to construct the relationship between the point of maximum efficiency and other points, and propose a high-efficiency zone adjustment method. The process is complex, the engineering application is difficult, and the calibration speed is slow. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a method, apparatus and device for designing the high-efficiency range of a synchronous motor, so as to achieve rapid calibration of the high-efficiency range of a synchronous motor.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for designing high-efficiency ranges for synchronous motors includes:

[0008] Obtain the influencing parameters that are related to the magnitude of the highest efficiency point in the synchronous motor;

[0009] Based on the different directions of influence of the aforementioned influencing parameters on the point of highest motor efficiency, the influencing parameters are divided into N groups, where N is a positive integer greater than 1.

[0010] Obtain the design values ​​of the initial influence parameters of the synchronous motor;

[0011] Calculate the initial point of maximum efficiency based on the aforementioned initial influence parameters;

[0012] Determine whether the initial point of maximum efficiency meets the design requirements;

[0013] When the design requirements are not met, obtain the movement direction of the initial point with the highest efficiency.

[0014] Obtain the influence parameter set that matches the moving party, and use the influence parameters in the influence parameter set as the target parameters;

[0015] Adjust the target parameter in the initial influence parameters so that the initial point of highest efficiency moves along the moving direction until the initial point of highest efficiency meets the design requirements;

[0016] When the initial efficiency peak meets the design requirements, the corresponding initial influence parameters are output.

[0017] Optionally, in the above-mentioned synchronous motor high-efficiency range design method, after obtaining the influence parameters of the synchronous motor with the highest efficiency point, and before dividing the influence parameters into N groups of influence parameters, the method further includes:

[0018] The simulation was designed based on the control variable method. The influencing parameters were used as independent variables and the highest efficiency point of the motor was used as dependent variables. The simulation calculation was performed to obtain the influence direction of different influencing parameters on the highest efficiency point of the synchronous motor.

[0019] Optionally, in the above-mentioned synchronous motor high-efficiency range design method, the N sets of influencing parameters include:

[0020] The first set of influencing parameters includes: core stack height, stator yoke height, and bus voltage.

[0021] The second set of influencing parameters includes: stator tooth width;

[0022] The third set of influencing parameters includes: the number of winding turns and the width of the permanent magnet.

[0023] Optionally, in the above-mentioned method for designing the high-efficiency range of a synchronous motor, obtaining the design values ​​of the initial influence parameters of the synchronous motor includes:

[0024] Determine the motor bus voltage based on pre-set motor development requirements or vehicle requirements;

[0025] Simulation analysis was conducted with the number of winding turns as a variable to calculate the back electromotive force of the motor under different winding turns, and the number of winding turns was determined by the constraint conditions of the target back electromotive force.

[0026] The width of the permanent magnet is determined based on the target peak power and target peak torque;

[0027] The stator yoke height is determined based on the rated speed corresponding to the rated point as a constraint.

[0028] Determine the stator tooth width based on the rated torque corresponding to the rated point;

[0029] The core stacking height is determined based on the motor's design cost or installation space requirements.

[0030] Optionally, in the above-mentioned synchronous motor high-efficiency range design method, adjusting the target parameter in the initial influence parameters includes:

[0031] Obtain the priority of each influencing parameter included in the target parameter, and adjust the target parameter in sequence based on the order of the priorities.

[0032] Optionally, in the above-mentioned synchronous motor high-efficiency range design method, adjusting the target parameters sequentially based on the priority order includes:

[0033] The target parameters are determined sequentially based on the priority order, and the determined target parameters are adjusted based on the adjustment step size corresponding to the determined target parameters.

[0034] A high-efficiency range calibration device for synchronous motors, comprising:

[0035] An influencing parameter classification unit is used to obtain influencing parameters that are related to the magnitude of the highest efficiency point of the synchronous motor; based on the different directions of influence of the influencing parameters on the highest efficiency point of the motor, the influencing parameters are divided into N influencing parameter groups, where N is a positive integer greater than 1;

[0036] The design parameter acquisition unit is used to acquire the design values ​​of the initial influence parameters of the synchronous motor.

[0037] The high-efficiency zone judgment unit is used to calculate the initial highest efficiency point based on the initial influence parameters and to determine whether the initial highest efficiency point meets the design requirements.

[0038] The high-efficiency zone adjustment unit is used to, when the initial point of highest efficiency does not meet the design requirements, obtain the moving direction of the initial point of highest efficiency; obtain a set of influence parameters matching the moving direction, and use the influence parameters in the set of influence parameters as target parameters; adjust the target parameters in the initial influence parameters so that the initial point of highest efficiency moves along the moving direction until the initial point of highest efficiency meets the design requirements.

[0039] The design parameter output unit is used to output the corresponding initial influence parameters when the initial efficiency peak meets the design requirements.

[0040] Optionally, in the above-mentioned synchronous motor high-efficiency range calibration device, after obtaining the influence parameters of the synchronous motor with the highest efficiency point, the influence parameter classification unit is further used to:

[0041] The simulation was designed based on the control variable method. The influencing parameters were used as independent variables and the highest efficiency point of the motor was used as dependent variables. The simulation calculation was performed to obtain the influence direction of different influencing parameters on the highest efficiency point of the synchronous motor.

[0042] Optionally, in the above-mentioned synchronous motor high-efficiency range calibration device, the N sets of influencing parameters include:

[0043] The first set of influencing parameters includes: core stack height, stator yoke height, and bus voltage.

[0044] The second set of influencing parameters includes: stator tooth width;

[0045] The third set of influencing parameters includes: the number of winding turns and the width of the permanent magnet.

[0046] A high-efficiency range calibration device for synchronous motors, comprising:

[0047] Memory and processor;

[0048] The memory is used to store programs;

[0049] The processor is used to execute the program to implement each step of the synchronous motor high-efficiency range design method described above.

[0050] Based on the above technical solution, the solution provided by the embodiments of the present invention first determines the direction of influence of the synchronous motor's influence parameters on the synchronous motor's highest efficiency point, and divides these influence parameters into multiple influence parameter groups based on the different influence directions. During the motor design process, when the highest efficiency point of the motor corresponding to the initial influence parameters does not meet the design requirements, the direction in which the highest efficiency point needs to be moved is obtained. Based on the moving direction and the influence parameter group, the target parameter to be adjusted is determined, and then the value of the target parameter in the initial influence parameters is adjusted so that the highest efficiency point of the motor can quickly meet the design requirements, thereby realizing the rapid calibration of the synchronous motor's design parameters. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0052] Figure 1 Here is a flowchart illustrating a method for designing high-efficiency ranges of a synchronous motor, as disclosed in an embodiment of this application.

[0053] Figure 2 This is a schematic diagram illustrating the direction of influence of the influence parameters disclosed in the embodiments of this application on the point of highest efficiency;

[0054] Figure 3 This is a schematic diagram of the structure of a high-efficiency range design device for a synchronous motor disclosed in an embodiment of this application;

[0055] Figure 4 This is a schematic diagram of the structure of a high-efficiency range design device for a synchronous motor disclosed in an embodiment of this application. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] This invention provides a high-efficiency range-oriented design method for synchronous motors. By pre-determining the influence direction of various parameters of the synchronous motor on the highest efficiency point of the synchronous motor, the highest efficiency point is calculated based on the initial design parameters during the design of the synchronous motor. When the highest efficiency point does not meet the requirements, the target parameters in the initial design parameters are adjusted based on the influence direction of various parameters on the highest efficiency point of the synchronous motor, so that the highest efficiency point of the motor can quickly meet the design requirements, thereby achieving rapid calibration of the design parameters of the synchronous motor.

[0058] Efficiency MAP: This refers to the efficiency distribution diagram of a motor, which reflects the distribution of motor efficiency at different speeds and torques.

[0059] High efficiency range: The range of efficiencies greater than or equal to a certain efficiency in the efficiency MAP graph. In this patent, the range of efficiencies greater than or equal to 95% is taken as an example.

[0060] For details, see Figure 1 The synchronous motor high-efficiency range design method disclosed in this application may specifically include:

[0061] Step S101: Obtain the influencing parameters that are related to the magnitude of the point of highest motor efficiency in the synchronous motor.

[0062] The synchronous motor can be a V-type permanent magnet synchronous motor. In this step, the design parameters of the synchronous motor are obtained in advance. The design parameters are used as independent variables and the highest efficiency point of the synchronous motor is used as the dependent variable. Simulation analysis is performed to obtain the parameters in the design parameters that are related to the magnitude of the highest efficiency point. These parameters are recorded as influencing parameters.

[0063] In this scheme, the design parameters may include the number of winding turns, stator tooth width, core stack height, stator yoke height, permanent magnet thickness, permanent magnet width, permanent magnet spacing, permanent magnet included angle, effective value of alternating current, and bus voltage. The influencing parameters may include: core stack height, stator yoke height, bus voltage, stator tooth width, number of winding turns, and permanent magnet width.

[0064] Step S102: Based on the different directions of influence of the influencing parameters on the highest efficiency point of the motor, the influencing parameters are divided into N groups of influencing parameters, where N is a positive integer greater than 1.

[0065] Using these influencing parameter groups as independent variables, an orthogonal simulation is designed, and electromagnetic analysis is performed using finite element software. The influence of each independent variable on the motor's inflection point speed, peak torque, and the speed and torque corresponding to the highest efficiency point is analyzed. Based on the influence of each variable on the center position of the high-efficiency zone, these influencing parameters are divided into N influence groups. In this scheme, the value of N is 3.

[0066] Specifically, using the core stack height, stator yoke height, bus voltage, stator tooth width, winding turns, and permanent magnet width as independent variables, a simulation is designed based on the controlled variable method to conduct electromagnetic simulation analysis of the motor. The inflection point speed, peak torque, and speed and torque corresponding to the highest efficiency point of the motor under different influencing parameters are extracted from the simulation calculation results. The influence of each influencing parameter on the inflection point speed, peak torque, and speed and torque corresponding to the highest efficiency point is analyzed. The movement of the highest efficiency point is decomposed into vertical and horizontal movement. Based on the different influences of various influencing parameters on the direction of movement of the highest efficiency point, they are divided into three categories: the first category is influencing parameters that cause the highest efficiency point to mainly undergo horizontal displacement; the second category is influencing parameters that cause the highest efficiency point to mainly undergo vertical displacement; and the third category is influencing parameters that cause the highest efficiency point to undergo movement in both directions. Based on the simulation research of this patent, for synchronous motors, the first category of influencing parameters includes core stack height, stator yoke height, and bus voltage; the second category includes stator tooth width; and the third category includes winding turns and permanent magnet width.

[0067] That is, the first type of influencing parameters are divided into the first group of influencing parameters. The first group of influencing parameters includes: core stack height, stator yoke height and bus voltage. When the value of any one of the core stack height, stator yoke height and bus voltage changes, the point of highest efficiency will shift in the left and right directions. In the left and right directions, to the left means that the motor speed value corresponding to the highest efficiency point decreases, and to the right means that the corresponding motor speed value increases.

[0068] The second type of influencing parameters are classified into the second group of influencing parameters. The second group of influencing parameters includes: stator tooth width; when the value of the stator tooth width changes, the point of highest efficiency will move in the vertical direction. In the vertical direction, upward means that the torque value corresponding to the point of highest efficiency increases, and to the right means that the corresponding torque value decreases.

[0069] The third category of influencing parameters is classified into a third group of influencing parameters, which includes the number of winding turns and the width of the permanent magnet. When the number of winding turns and the width of the permanent magnet change, the high-efficiency point simultaneously shifts in two directions. For example, when the number of winding turns increases, the high-efficiency point moves to the left and downwards simultaneously; when the number of winding turns decreases, the high-efficiency point moves to the right and upwards simultaneously. Similarly, when the width of the permanent magnet increases, the high-efficiency point moves to the left and upwards simultaneously; and when the width of the permanent magnet decreases, the high-efficiency point moves to the right and downwards simultaneously.

[0070] Specifically, the influence of the first, second, and third types of influencing parameters on the direction of movement of the high-efficiency point can be found in [reference needed]. Figure 2 As shown, Figure 2In the diagram, the solid small arrow indicates an increase in the influencing parameter, while the hollow large arrow points in the direction of displacement of the high-efficiency point affected by the increase in the parameter. Figure 2 The width of the magnet in the text refers to the width of the permanent magnet. Figure 2 The voltage mentioned refers to the bus voltage.

[0071] Step S103: Obtain the design values ​​of the initial influence parameters of the synchronous motor.

[0072] In this scheme, when it is necessary to design a synchronous motor for a certain model, it is necessary to preliminarily design the design parameters of the synchronous motor. These design parameters include at least the initial influence parameters, and each of these design parameters has a design value, which can be regarded as the initial value of the design parameters.

[0073] Step S104: Calculate the initial point of highest efficiency based on the initial influence parameters.

[0074] In this step, based on the design values ​​of the initial influence parameters, the design values ​​of the initial influence parameters are substituted into the simulation model of the permanent magnet synchronous motor for simulation calculation, and the corresponding initial highest efficiency point is calculated.

[0075] Step S105: Determine whether the initial point of highest efficiency meets the design requirements.

[0076] In this step, after obtaining the initial highest efficiency point calculated based on the initial influence parameters, the initial high efficiency interval is determined based on the initial highest efficiency point, and it is determined whether the initial high efficiency interval meets the design requirements.

[0077] To determine whether the initial high-efficiency range meets the design requirements, the boundary speed and boundary torque corresponding to the initial high-efficiency range can be used as a basis. Since the center of the high-efficiency range is the point of highest efficiency, whether the high-efficiency range meets the design requirements can be equivalent to whether the point of highest efficiency meets the design requirements.

[0078] Alternatively, the user can use experience to determine whether the initial high-efficiency interval meets the design requirements. If the user determines that the initial high-efficiency interval does not meet the design requirements, a first instruction is sent to the system applying this method. When the first instruction is received, it indicates that the initial point of highest efficiency does not meet the design requirements. If the user determines that the initial high-efficiency interval meets the design requirements, a second instruction is sent to the system applying this method. When the second instruction is received, it indicates that the initial point of highest efficiency meets the design requirements.

[0079] Step S106: When the design requirements are not met, obtain the movement direction of the initial point with the highest efficiency.

[0080] In this scheme, when it is determined that the initial point of highest efficiency does not meet the design requirements, the moving direction of the initial point of highest efficiency is obtained. This moving direction can be manually marked, for example, the initial point of highest efficiency can move up, down, left, right, upper left, lower left, upper right, lower right, etc.

[0081] Step S107: Obtain the influence parameter group that matches the moving party, and use the influence parameters in the influence parameter group as the target parameters.

[0082] After determining the direction of movement of the initial point of highest efficiency, obtain the set of influence parameters corresponding to the line of movement direction, and determine the target parameters;

[0083] For example, when the movement direction is left or right, the first influence parameter group is selected, and all parameters in the first influence parameter group are used as target parameters. When the movement direction is up or down, the second influence parameter group is selected, and all parameters in the second influence parameter group are used as target parameters. When the movement direction is upper left or lower right, the third influence parameter group is selected, and the permanent magnet width in the third influence parameter group is used as target parameters. When the movement direction is lower left or upper right, the third influence parameter group is selected, and the number of winding turns in the third influence parameter group is used as target parameters.

[0084] Step S108: Adjust the target parameter in the initial influence parameters so that the initial point of highest efficiency moves along the moving direction.

[0085] In this step, once the target parameter is determined, the value of the target parameter is adjusted to increase or decrease it, so that the initial point of highest efficiency moves along the moving direction. Steps S105-S108 can be executed multiple times and repeatedly until the initial point of highest efficiency meets the design requirements.

[0086] Step S109: When the initial efficiency peak meets the design requirements, output the corresponding initial influence parameters.

[0087] When the initial point of highest efficiency meets the design requirements, the values ​​of each initial influencing parameter corresponding to the initial point of highest efficiency are obtained. These values ​​can be adjusted values, and these values ​​are output as the design results of the high-efficiency range of the synchronous motor.

[0088] As can be seen from the above scheme, the technical solution disclosed in this application first determines the direction of influence of the synchronous motor's influence parameters on the synchronous motor's highest efficiency point, and divides these influence parameters into multiple influence parameter groups based on the different influence directions. During the motor design process, when the highest efficiency point of the motor corresponding to the initial influence parameters does not meet the design requirements, the direction in which the highest efficiency point needs to be moved is obtained. Based on the moving direction and the influence parameter group, the target parameter to be adjusted is determined, and then the value of the target parameter in the initial influence parameters is adjusted so that the highest efficiency point of the motor can quickly meet the design requirements, thereby realizing the rapid calibration of the synchronous motor's design parameters.

[0089] In another embodiment of the technical solution disclosed in this application, the initial influence parameters can be directly input by the user or obtained through certain analysis and calculation. For example, in this solution, obtaining the design values ​​of the initial influence parameters of the synchronous motor can include:

[0090] Determine the motor bus voltage based on pre-set motor development requirements or vehicle requirements;

[0091] Simulation analysis was conducted using the number of winding turns as a variable to calculate the back electromotive force (EMF) of the motor under different winding turns. The number of winding turns was then determined by the constraint conditions of the target back EMF. Specifically, the number of winding turns was determined by the back EMF at the highest speed, and the number of winding turns also needed to meet temperature rise verification requirements. During the temperature rise verification process, the electromagnetic design of the motor needed to be checked to see if the temperature rise reached the limit. Under normal rated stable operation and peak transient operation of the motor, the temperature of the windings and permanent magnets must be less than a certain value. This process is called temperature rise verification.

[0092] The permanent magnet width is determined based on the target peak power and target peak torque. The peak torque and peak power are known quantities that have been determined before the motor design and are derived from the calculation of the vehicle's dynamic performance. After the current value is determined (limited by the controller requirements), the permanent magnet width will directly affect the peak torque and peak power that can be achieved. The minimum permanent magnet width corresponding to the peak torque and peak power can be calculated separately. The permanent magnet width is taken as the maximum value of the two minimum permanent magnet widths (it is necessary to meet the requirements of peak torque and peak power at the same time).

[0093] Based on the rated speed at the rated point, the stator yoke height is determined. By using the rated speed at the rated point in the development requirements, the approximate range of the inflection point speed is determined. It can be assumed that the rated speed is approximately equal to the inflection point speed. Therefore, after determining the rated speed, the stator yoke height can be determined using the rated speed.

[0094] Determine the stator tooth width based on the rated torque at the rated point;

[0095] The core stacking height is determined based on the motor's design cost or installation space requirements.

[0096] Of course, those skilled in the art can also use other design schemes in the prior art to obtain the initial values ​​of the above-mentioned influencing factors in the motor design process.

[0097] In this solution, considering that changes to different design parameters have varying impacts on the product—some changes have a smaller impact while others have a larger impact—adjusting the target parameters in the initial impact parameters can specifically include: obtaining the priority of each impact parameter included in the target parameters; adjusting the target parameters sequentially based on the priority order, i.e., prioritizing the adjustment of higher-priority target parameters; if the movement distance of the highest efficiency point still does not meet the movement requirement after adjusting higher-priority target parameters, adjusting the next-priority target parameter; if the movement distance of the highest efficiency point still does not meet the movement requirement after adjusting all target parameters, repeating this step until the movement distance of the highest efficiency point meets the movement requirement. Each target parameter has its own adjustment step size; when adjusting a target parameter, it is adjusted based on its corresponding adjustment step size, with one step size adjusted each time.

[0098] Alternatively, when adjusting the target parameter in the initial influence parameters, the system using this method can directly display the configuration list of the target parameters to the user, allowing the user to manually adjust the target parameter as needed.

[0099] This embodiment discloses a high-efficiency range calibration device for synchronous motors. For the specific working content of each unit in the device, please refer to the content of the above method embodiment.

[0100] The high-efficiency range calibration device for synchronous motors provided in the embodiments of the present invention is described below. The high-efficiency range calibration device for synchronous motors described below can be referred to in correspondence with the high-efficiency range calibration method for synchronous motors described above.

[0101] For details, see Figure 3 This application discloses a high-efficiency range calibration device for synchronous motors, the device comprising:

[0102] The influencing parameter classification unit A, corresponding to the above method, is used to obtain the influencing parameters that are related to the magnitude of the highest efficiency point of the synchronous motor; based on the different directions of influence of the influencing parameters on the highest efficiency point of the motor, the influencing parameters are divided into N influencing parameter groups, where N is a positive integer greater than 1;

[0103] Design parameter acquisition unit B, corresponding to the above method, is used to acquire the design values ​​of the initial influence parameters of the synchronous motor;

[0104] The high-efficiency zone judgment unit C, corresponding to the above method, is used to calculate the initial highest efficiency point based on the initial influence parameters; and to determine whether the initial highest efficiency point meets the design requirements.

[0105] The high-efficiency zone adjustment unit D, corresponding to the above method, is used to obtain the moving direction of the initial highest efficiency point when the initial highest efficiency point does not meet the design requirements; obtain an influence parameter group that matches the moving direction, and use the influence parameters in the influence parameter group as target parameters; adjust the target parameters in the initial influence parameters so that the initial highest efficiency point moves along the moving direction until the initial highest efficiency point meets the design requirements.

[0106] The design parameter output unit E, corresponding to the above method, is used to output the corresponding initial influence parameters when the initial efficiency peak point meets the design requirements.

[0107] Corresponding to the above method, after obtaining the influence parameters of the point with the highest motor efficiency in the synchronous motor, the influence parameter classification unit A is further used to:

[0108] The simulation was designed based on the control variable method. The influencing parameters were used as independent variables and the highest efficiency point of the motor was used as dependent variables. The simulation calculation was performed to obtain the influence direction of different influencing parameters on the highest efficiency point of the synchronous motor.

[0109] Figure 4 The hardware structure diagram of the high-efficiency range calibration device for synchronous motors provided in this embodiment of the invention is shown below. Figure 4 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0110] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 4 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0111] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0112] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0113] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0114] Specifically, processor 100 is used for:

[0115] Obtain the influencing parameters that are related to the magnitude of the highest efficiency point in the synchronous motor;

[0116] Based on the different directions of influence of the aforementioned influencing parameters on the point of highest motor efficiency, the influencing parameters are divided into N groups, where N is a positive integer greater than 1.

[0117] Obtain the design values ​​of the initial influence parameters of the synchronous motor;

[0118] Calculate the initial point of maximum efficiency based on the aforementioned initial influence parameters;

[0119] Determine whether the initial point of maximum efficiency meets the design requirements;

[0120] When the design requirements are not met, obtain the movement direction of the initial point with the highest efficiency.

[0121] Obtain the influence parameter set that matches the moving party, and use the influence parameters in the influence parameter set as the target parameters;

[0122] Adjust the target parameter in the initial influence parameters so that the initial point of highest efficiency moves along the moving direction until the initial point of highest efficiency meets the design requirements;

[0123] When the initial efficiency peak meets the design requirements, the corresponding initial influence parameters are output.

[0124] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0125] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0126] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0127] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0128] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0129] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for designing high-efficiency ranges for synchronous motors, characterized in that, include: Obtain the influencing parameters that are related to the magnitude of the highest efficiency point in the synchronous motor; The simulation was designed based on the control variable method. The influencing parameters were used as independent variables and the highest efficiency point of the motor was used as dependent variables. The simulation calculation was performed to obtain the influence direction of different influencing parameters on the highest efficiency point of the synchronous motor. Based on the different effects of the aforementioned influencing parameters on the direction of movement of the speed and torque corresponding to the point of highest motor efficiency, the influencing parameters are divided into at least three groups, wherein: The first set of influencing parameters, whose values ​​change, cause the point of highest efficiency to shift in the left and right directions. The first set of influencing parameters includes: core stack height, stator yoke height, and bus voltage. The second set of influencing parameters, whose values ​​change, cause the point of highest efficiency to shift vertically. The second set of influencing parameters includes: stator tooth width. The third set of influencing parameters, whose values ​​change, cause the point of highest efficiency to shift simultaneously in both the left-right and up-down directions. The third set of influencing parameters includes: the number of winding turns and the width of the permanent magnet. Obtain the design values ​​of the initial influence parameters of the synchronous motor; Calculate the initial point of maximum efficiency based on the aforementioned initial influence parameters; Determine whether the initial point of maximum efficiency meets the design requirements; When the design requirements are not met, obtain the movement direction of the initial point with the highest efficiency. Based on the direction of movement, a matching set of influence parameters is selected from the first set of influence parameters, the second set of influence parameters, and the third set of influence parameters as the target parameter; Adjust the target parameter in the initial influence parameters so that the initial point of highest efficiency moves along the moving direction until the initial point of highest efficiency meets the design requirements; When the initial efficiency peak meets the design requirements, the corresponding initial influence parameters are output.

2. The synchronous motor high-efficiency range design method according to claim 1, characterized in that, The process of obtaining the design values ​​of the initial influence parameters of the synchronous motor includes: Determine the motor bus voltage based on pre-set motor development requirements or vehicle requirements; Simulation analysis was conducted with the number of winding turns as a variable to calculate the back electromotive force of the motor under different winding turns, and the number of winding turns was determined by the constraint conditions of the target back electromotive force. The width of the permanent magnet is determined based on the target peak power and target peak torque; The stator yoke height is determined based on the rated speed corresponding to the rated point as a constraint. Determine the stator tooth width based on the rated torque corresponding to the rated point; The core stacking height is determined based on the motor's design cost or installation space requirements.

3. The synchronous motor high-efficiency range design method according to claim 1, characterized in that, Adjusting the target parameter in the initial influence parameters includes: Obtain the priority of each influencing parameter included in the target parameter, and adjust the target parameter in sequence based on the order of the priorities.

4. The synchronous motor high-efficiency range design method according to claim 3, characterized in that, The target parameters are adjusted sequentially based on the priority order, including: The target parameters are determined sequentially based on the priority order, and the determined target parameters are adjusted based on the adjustment step size corresponding to the determined target parameters.

5. A high-efficiency range calibration device for a synchronous motor, characterized in that, include: The influencing parameter classification unit is used to obtain influencing parameters that are related to the magnitude of the highest efficiency point in the synchronous motor. Simulations were designed based on the controlled variable method, using the influencing parameters as independent variables and the highest efficiency point of the motor as the dependent variable. Simulation calculations were performed to obtain the direction of influence of different influencing parameters on the highest efficiency point of the synchronous motor. Based on the different directions of movement of the rotational speed and torque corresponding to the highest efficiency point, the influencing parameters were divided into at least three groups: The first group of influencing parameters, whose numerical changes cause a left-right displacement of the highest efficiency point, includes: core stack height, stator yoke height, and bus voltage; the second group of influencing parameters, whose numerical changes cause a vertical displacement of the highest efficiency point, includes: stator tooth width; and the third group of influencing parameters, whose numerical changes cause both left-right and vertical displacements of the highest efficiency point, includes: number of winding turns and permanent magnet width. The design parameter acquisition unit is used to acquire the design values ​​of the initial influence parameters of the synchronous motor. The high-efficiency zone judgment unit is used to calculate the initial highest efficiency point based on the initial influence parameters and to determine whether the initial highest efficiency point meets the design requirements. The high-efficiency zone adjustment unit is used to obtain the movement direction of the initial highest efficiency point when the initial highest efficiency point does not meet the design requirements; based on the movement direction, select a matching set of influence parameters from the first set of influence parameters, the second set of influence parameters, and the third set of influence parameters as the target parameter; adjust the target parameter in the initial influence parameters so that the initial highest efficiency point moves along the movement direction until the initial highest efficiency point meets the design requirements; The design parameter output unit is used to output the corresponding initial influence parameters when the initial efficiency peak meets the design requirements.

6. A high-efficiency range calibration device for synchronous motors, characterized in that, include: Memory and processor; The memory is used to store programs; The processor is used to execute the program to implement each step of the synchronous motor high-efficiency range design method as described in any one of claims 1-4.

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