Shaft voltage design checking method and device, equipment, storage medium and product
By calculating the shaft voltage, ensuring that it is within the safe range, it solves the problem of bearing electrical corrosion in the motor design stage, optimizes the motor design, and shortens the development cycle and cost.
Patent Information
- Application Number
- CN202411300466.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2024-12-31
AI Technical Summary
The existing technology lacks design verification methods for bearing electrical corrosion problems in the motor design stage, resulting in repeated increase in development cycles and costs in the later design.
By obtaining the initial motor design parameters, calculate the rotor-stator winding coupling capacitor, rotor-stator coupling capacitor, equivalent bearing capacitor and common mode voltage to ensure that the shaft voltage is within the preset range, thereby optimizing the motor design and avoiding electrical corrosion of the bearing.
It realizes effective verification of bearing electrical corrosion problems during the design stage, shortens the motor development cycle and cost, and improves the accuracy and reliability of motor design.
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Figure CN119227364A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of motor design, and in particular to shaft voltage design and verification methods, devices, equipment, storage media and products. Background Art
[0002] During the operation of the motor, the motor bearings must not only withstand high temperatures, radial pressure caused by loads, but also shaft currents generated by the inverter. The shaft currents will degrade the bearing lubrication film and generate electric spark discharges between the inner and outer raceways of the bearing and the bearing rolling elements, causing pitting corrosion on the inner and outer raceways of the bearing and the surface of the rolling elements. As the motor runs longer, the pitting corrosion of the inner and outer raceways of the bearing will eventually evolve into raceway ripples, which will affect the smooth and safe operation of the motor. With the trend of high voltage, high speed / high frequency, and high integration of electric drive systems, the failure mode of electrical corrosion of bearings and gears has become a problem that must be considered and solved during product design.
[0003] At present, the industry mainly verifies the problem of bearing electrical corrosion by measuring shaft voltage and shaft current through tests or directly conducting tests. There is a lack of corresponding shaft voltage design verification methods, and it is impossible to perform design verification and optimization for bearing electrical corrosion problems in the design stage, which can easily lead to repetition of related designs in the later stage and increase the electric drive development cycle and cost.
[0004] Therefore, how to conduct design verification for bearing electrical corrosion problems during the design phase is a problem that needs to be solved urgently. Summary of the invention
[0005] The main purpose of this application is to provide a shaft voltage design verification method, device, equipment, storage medium and product, aiming to solve the technical problem that it is impossible to perform design verification for bearing electrical corrosion problems during the design stage.
[0006] To achieve the above objectives, the present application proposes a shaft voltage design verification method, the method comprising:
[0007] Obtain initial motor design parameters;
[0008] Determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters;
[0009] Calculating the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage;
[0010] When the shaft voltage is within a preset range, the initial motor design parameters are identified as target motor design parameters, and the target motor design parameters are output.
[0011] In one embodiment, the step of obtaining initial motor design parameters includes:
[0012] Perform preliminary selection of motor bearings based on actual vehicle requirements and obtain preliminary selection results of motor bearings;
[0013] Initial motor design parameters are determined based on the preliminary motor bearing selection results.
[0014] In one embodiment, the initial motor design parameters include stator parameters, rotor parameters, winding parameters and gap parameters, and the step of determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters includes:
[0015] Obtaining a first difference and a first sum through the stator parameters, the winding parameters and the gap parameters;
[0016] Calculating the rotor-stator winding coupling capacitance according to the stator parameter, the rotor parameter, the first difference value and the first sum value;
[0017] Obtaining a first product through the stator parameter and the rotor parameter;
[0018] calculating the rotor-stator coupling capacitance according to the gap parameter and the first product;
[0019] The equivalent bearing capacitance and common mode voltage are extracted from the initial motor design parameters.
[0020] In one embodiment, the step of obtaining the first difference and the first sum through the stator parameters, the winding parameters and the gap parameters comprises:
[0021] Acquire a stator slot width and a stator slot height from the stator parameters, and calculate a first difference according to the stator slot width and the stator slot height;
[0022] Acquire a first gap width, a second gap width, and a thickness of a winding insulation layer, wherein the first gap width and the second gap width belong to the gap parameters, and the thickness of the winding insulation layer belongs to the winding parameters;
[0023] A first sum value is determined according to the stator slot height, the first gap width, the second gap width, and the thickness of the winding insulation layer.
[0024] In one embodiment, the step of calculating the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage comprises:
[0025] Calculating a second sum value according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance and the equivalent bearing capacitance;
[0026] Calculating a bearing voltage divider ratio according to the rotor-stator winding coupling capacitance and the second sum value;
[0027] The shaft voltage is obtained by calculating the product of the common mode voltage and the bearing voltage division ratio.
[0028] In one embodiment, after the step of calculating the shaft voltage according to the initial motor design parameters, the following steps are included:
[0029] When the shaft voltage is not within the preset range, return to the step of obtaining initial motor design parameters.
[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a shaft voltage design verification device, the shaft voltage design verification device comprising:
[0031] In addition, to achieve the above-mentioned objectives, the present application also proposes a shaft voltage design verification device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the shaft voltage design verification method as described above.
[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the shaft voltage design verification method described above are implemented.
[0033] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the shaft voltage design verification method described above are implemented.
[0034] One or more technical solutions proposed in this application have at least the following technical effects:
[0035] The initial motor design parameters are obtained, and the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance, and common-mode voltage are determined according to the initial motor design parameters. The shaft voltage is calculated according to the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance, and common-mode voltage. When the shaft voltage is within a preset range, the initial motor design parameters are identified as the target motor design parameters, and the target motor design parameters are output. The motor shaft voltage is calculated by analytical methods, which can provide guidance for motor design optimization and avoid the problem of bearing electrical corrosion caused by bearing current caused by high shaft voltage in the motor. By calculating the shaft voltage and ensuring that it is within a safe range, the bearing current can be effectively prevented from damaging the bearing, and the motor development cycle and cost can also be shortened. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0038] Figure 1 This is a flow chart of the first embodiment of the shaft voltage design and verification method of the present application;
[0039] Figure 2 This is a flow chart of the second embodiment of the shaft voltage design and verification method of the present application;
[0040] Figure 3 This is a flow chart of the third embodiment of the shaft voltage design and verification method of the present application;
[0041] Figure 4 This is a flow chart of a fourth embodiment of the shaft voltage design and verification method of the present application;
[0042] Figure 5 This is a schematic diagram of the module structure of the shaft voltage design and verification device according to an embodiment of the present application;
[0043] Figure 6 Schematic diagram of the equipment structure of the hardware operating environment involved in the shaft voltage design and verification method in the embodiment of the present application.
[0044] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0045] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.
[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.
[0047] During the operation of the motor, the motor bearings must not only withstand high temperatures, radial pressure caused by loads, but also shaft currents generated by the inverter. The shaft currents will degrade the bearing lubrication film and generate spark discharges between the inner and outer raceways of the bearing and the bearing rolling elements, pitting the inner and outer raceways of the bearing and the rolling element surfaces. As the motor runs longer, the pitting of the inner and outer raceways of the bearing will eventually evolve into raceway ripples, which will affect the smooth and safe operation of the motor. With the trend of high voltage, high speed / high frequency, and high integration of electric drive systems, the failure mode of electrical corrosion of bearings and gears has become a problem that must be considered and solved during product design. At present, the industry mainly verifies the problem of electrical corrosion of bearings by measuring shaft voltage and shaft current through tests or directly conducting tests. There is a lack of corresponding shaft voltage design verification methods, and it is impossible to perform design verification and optimization for the problem of electrical corrosion of bearings in the design stage, which is easy to cause repetition of related designs in the later stage, increasing the development cycle and cost of electric drives.
[0048] The present application provides a solution to obtain the initial motor design parameters, determine the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance and common mode voltage according to the initial motor design parameters, calculate the shaft voltage according to the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance and common mode voltage, and when the shaft voltage is within a preset range, identify the initial motor design parameters as target motor design parameters, and output the target motor design parameters. The motor shaft voltage is calculated by analytical methods, which can provide guidance for motor design optimization and avoid the problem of bearing electrical corrosion caused by bearing current caused by high shaft voltage in the motor. By calculating the shaft voltage and ensuring that it is within a safe range, the bearing current can be effectively prevented from damaging the bearing, and the motor development cycle and cost can also be shortened.
[0049] Based on this, the embodiment of the present application provides a shaft voltage design verification method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the shaft voltage design and verification method of the present application.
[0050] In this embodiment, the shaft voltage design verification method includes steps S10 to S50:
[0051] Step S10, obtaining initial motor design parameters.
[0052] It should be noted that the initial motor design parameters can be understood as a set of parameters initially determined during the motor design phase, and this set of parameters can be used to analyze and optimize the motor performance. Exemplarily, the initial motor design parameters may include the size, material, winding type, magnetic field strength, etc. of the motor.
[0053] Step S20, determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters.
[0054] It should be noted that the rotor-stator winding coupling capacitance is the capacitance between the rotor winding and the stator winding, which will affect the electrical performance of the motor, such as electromagnetic compatibility (EMC) and the electrical coupling effect between the rotor and the stator. The rotor-stator coupling capacitance is the capacitance between the rotor winding and the stator winding, which is used to calculate the impact of the internal electric field of the motor. The equivalent bearing capacitance is the capacitance value of the bearing, which is related to the insulation characteristics of the motor and the electrical insulation capability of the bearing, and is a key factor affecting the motor shaft voltage. The common mode voltage is the common voltage generated between the rotor and the stator, or between other electrical components of the motor.
[0055] Step S30, calculating the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage.
[0056] It should be noted that the shaft voltage is the voltage generated on the motor shaft.
[0057] Step S40: when the shaft voltage is within a preset range, the initial motor design parameters are identified as target motor design parameters, and the target motor design parameters are output.
[0058] It should be noted that the target motor design parameters can be understood as a final parameter set that has been verified to meet all design requirements, ensuring that the electrical and mechanical performance of the motor is within the expected design range. For example, the preset range of the shaft voltage can be 10 to 20V.
[0059] In this embodiment, the initial motor design parameters are obtained, the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage are determined according to the initial motor design parameters, and the shaft voltage is calculated according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage. When the shaft voltage is within a preset range, the initial motor design parameters are identified as the target motor design parameters, and the target motor design parameters are output. The motor shaft voltage is calculated by an analytical method, which can provide guidance for motor design optimization and avoid the problem of bearing electrical corrosion caused by the high shaft voltage in the motor causing the bearing current. By calculating the shaft voltage and ensuring that it is within a safe range, the bearing current can be effectively prevented from damaging the bearing, and the motor development cycle and cost are also shortened.
[0060] Reference Figure 2 , Figure 2 This is a flow chart of the second embodiment of the shaft voltage design and verification method of the present application. Figure 1 The first embodiment shown provides a second embodiment of the shaft voltage design verification method of the present application.
[0061] In the second embodiment, the step S10 includes:
[0062] Step S101, preliminarily selecting the motor bearing according to the actual requirements of the vehicle, and obtaining the preliminary selection result of the motor bearing.
[0063] It should be noted that the motor bearing is a component that supports the rotating shaft of the motor and reduces friction. The actual needs of the vehicle can be understood as the specific requirements of the motor when used in the vehicle, such as the load, speed, environmental conditions (such as temperature, humidity), etc. that the bearing needs to withstand. The preliminary selection results of the motor bearings can be the results obtained after the preliminary selection process, such as the selected bearing type, specifications and performance parameters. Exemplarily, after considering the actual needs of the vehicle and the working environment, select suitable motor bearings. Factors that need to be considered during selection include load capacity, speed, temperature resistance, corrosion resistance, etc.
[0064] Step S102, determining initial motor design parameters based on the preliminary motor bearing selection results.
[0065] It should be noted that the determination of the initial motor design parameters can be based on the analysis of the bearing selection results. Exemplarily, the bearing type and specification parameters are determined based on the selected bearing.
[0066] In this embodiment, by preliminarily selecting the motor bearings according to the actual needs of the vehicle, it can be ensured that the selected bearings can meet the specific use conditions and performance requirements of the vehicle. The preliminary selection helps to select the most suitable bearing type and specifications, thereby optimizing the performance of the motor in actual applications. Determining the initial motor design parameters based on the preliminary selection results of the motor bearings can make the design parameters closer to the actual application requirements and reduce adjustments and modifications in the subsequent design process.
[0067] Reference Figure 3 , Figure 3 This is a flow chart of the third embodiment of the shaft voltage design and verification method of the present application. Figure 2 The second embodiment shown provides a third embodiment of the shaft voltage design verification method of the present application.
[0068] In the third embodiment, the step S20 includes:
[0069] Step S201, obtaining a first difference and a first sum through stator parameters, winding parameters and gap parameters.
[0070] It should be noted that the stator parameters may include the number of stator slots, the stator slot width and the stator slot height, the winding parameters include the thickness of the winding insulation layer, and the gap parameters include the air gap width between the stator and the rotor and the gap width between the stator and the winding. The step S201 includes: obtaining the stator slot width and the stator slot height in the stator parameters, and calculating the first difference according to the stator slot width and the stator slot height; obtaining the first gap width, the second gap width and the thickness of the winding insulation layer, the first gap width and the second gap width belong to the gap parameters, and the thickness of the winding insulation layer belongs to the winding parameters; determining the first sum value according to the stator slot height, the first gap width, the second gap width and the thickness of the winding insulation layer.
[0071] For example, the number of stator slots is n, the stator slot width is w, the stator slot height is h, and the air gap width between the stator and the rotor is g. 1 , the gap width between the stator and the winding is g 2 , the thickness of the winding insulation layer is g 3 Then the first difference can be expressed as wh, and the first sum can be expressed as h+g 1 +g 2 +g 3 .
[0072] Step S202, calculating the rotor-stator winding coupling capacitance according to the stator parameter, the rotor parameter, the first difference and the first sum.
[0073] It should be noted that the first difference and the first sum can be understood as the intermediate values for calculating the rotor-stator winding coupling capacitance. The rotor parameters include the rotor length. In order to ensure the accuracy of the calculation results, the initial motor design parameters also include the free space dielectric constant and the dielectric constant between the stator and the winding.
[0074] For example, the free space dielectric constant is ε 0 , the dielectric constant between the stator and the winding is ε r1 , the rotor length is l, the rotor-stator winding coupling capacitance C sr It can be expressed as formula (1):
[0075]
[0076] In formula (1), C sr represents the rotor-stator winding coupling capacitance, n represents the number of stator slots, ε r1 Represents the dielectric constant between the stator and the winding, ε 0 represents the free space dielectric constant, l represents the rotor length, wh represents the first difference, h+g 1 +g 2 +g 3 Represents the first sum value, wherein the specific meanings of the characters in the first difference value and the first sum value have been explained in step S201 and will not be repeated here.
[0077] Step S203, obtaining a first product through the stator parameters and the rotor parameters.
[0078] It should be noted that the first product can be understood as the intermediate value of the rotor-stator coupling capacitance. Exemplarily, the first product can be expressed as formula (2):
[0079]
[0080] In formula (2), A rf represents the first product, r can be expressed as the bearing radius, and π represents pi.
[0081] Step S204: calculating the rotor-stator coupling capacitance according to the gap parameter and the first product.
[0082] For example, the rotor-stator coupling capacitance C rf It can be expressed as formula (3):
[0083]
[0084] In formula (3), C rf is the rotor-stator coupling capacitance, g 1 Indicates the width of the air gap between the stator and the rotor.
[0085] Step S205, extracting equivalent bearing capacitance and common mode voltage from the initial motor design parameters.
[0086] It should be noted that the initial motor design parameters also include the relative dielectric constant of lubricating oil or grease, the thickness of bearing oil film, the contact area between bearing rolling elements and bearing raceways, and the common mode voltage. The equivalent bearing capacitance is determined based on the relative dielectric constant of lubricating oil or grease, the thickness of bearing oil film, and the contact area between bearing rolling elements and bearing raceways. For example, ε is set r is the relative dielectric constant of lubricating oil or grease, h b is the bearing oil film thickness, A H is the contact area between the bearing rolling element and the bearing raceway. Equivalent bearing capacitance C B It can be expressed as formula (4):
[0087]
[0088] In formula (4), C B Expressed as the equivalent bearing capacitance, ε 0 is the free space dielectric constant, ε r Indicates the relative dielectric constant of lubricating oil or grease, h b Indicates the thickness of the bearing oil film, which is generally one tenth of the bearing radial clearance. Hrepresents the contact area between the bearing rolling element and the bearing raceway. In addition, the common mode voltage can be expressed as V com , generally the maximum and minimum values are ±Ud / 2 respectively, where Ud is the rated voltage of the three-phase motor.
[0089] In this embodiment, a systematic design method can be formed through an orderly calculation process, including intermediate steps such as difference, sum, and product. The correct extraction and optimization of the equivalent bearing capacitance can effectively reduce the risk of bearing damage caused by common-mode voltage and shaft voltage. By comprehensively considering the stator, rotor, winding and gap parameters, key electrical characteristics such as rotor-stator coupling capacitance and bearing capacitance are accurately calculated, and the influence of common-mode voltage is taken into account, thereby improving the design accuracy, efficiency and reliability of the motor.
[0090] Reference Figure 4 , Figure 4 This is a flow chart of the fourth embodiment of the shaft voltage design and verification method of the present application. Figure 3 The third embodiment shown provides a fourth embodiment of the shaft voltage design verification method of the present application.
[0091] In the fourth embodiment, the step S30 includes:
[0092] Step S301, calculating a second sum value according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance and the equivalent bearing capacitance.
[0093] It should be noted that the second sum can be understood as the intermediate value of the bearing pressure ratio. For example, the second sum can be expressed as C B +C sr +C rf , where C B is the equivalent bearing capacitance, C sr Represents the rotor-stator winding coupling capacitance, C rf Represents the rotor-stator coupling capacitance.
[0094] Step S302, calculating the bearing voltage divider ratio according to the rotor-stator winding coupling capacitance and the second sum value.
[0095] Exemplarily, the bearing pressure ratio can be expressed as formula (5):
[0096]
[0097] In formula (5), k b Expressed as a bearing voltage divider ratio, it can be understood that the bearing voltage divider ratio can be expressed as a ratio of the rotor-stator winding coupling capacitance to the second sum value.
[0098] Step S303, obtaining the shaft voltage by calculating the product of the common mode voltage and the bearing voltage divider ratio.
[0099] For example, the shaft voltage can be obtained by formula (6):
[0100] V shaft =k b ×V com (6)
[0101] In formula (6), V shaft Expressed as shaft voltage, k b Expressed as the bearing pressure ratio, V com Indicates the common-mode voltage.
[0102] In this embodiment, the introduction of the bearing voltage divider ratio can ensure the rationality of the voltage divider ratio through comprehensive consideration of multiple factors, thereby accurately calculating the shaft voltage and reducing the risk of motor bearing damage caused by excessive shaft voltage. Through detailed electrical calculations and optimization of the bearing voltage divider ratio, the motor design can cope with complex environments even under different working conditions, improving the fault tolerance and stability of the design.
[0103] In one implementation, based on the above embodiment, after step S30, the following steps are included: when the shaft voltage is not within the preset range, returning to step S10.
[0104] It should be noted that when the shaft voltage exceeds the preset range, the process returns to the step of obtaining the initial motor design parameters, that is, the motor bearings are reselected, and the initial motor design parameters are determined according to the motor bearing selection results. For example, the preset range of the shaft voltage can be 10 to 20V.
[0105] In this embodiment, when the shaft voltage exceeds the preset range, it may cause damage to the motor insulation system or bearing failure. This situation can be prevented by reselecting and adjusting the design parameters, ensuring that the motor will not cause electrical failures due to excessive shaft voltage in actual use. When the actual test results of the motor do not meet expectations, it is possible to quickly return to the design step for adjustment, which helps to quickly discover and solve problems in the design and improve the iteration efficiency of the design.
[0106] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the shaft voltage design and verification method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.
[0107] This application also provides a shaft voltage design verification device, please refer to Figure 5 , the shaft voltage design and verification device comprises:
[0108] An initial parameter acquisition module 10 is used to acquire initial motor design parameters;
[0109] A specific parameter determination module 20, for determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters;
[0110] A shaft voltage calculation module 30, used to calculate the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage;
[0111] The shaft voltage checking module 40 is used to identify the initial motor design parameters as target motor design parameters when the shaft voltage is within a preset range, and output the target motor design parameters.
[0112] The shaft voltage design verification device provided by the present application adopts the shaft voltage design verification method in the above embodiment, which can solve the technical problem that it is impossible to perform design verification for the bearing electrical corrosion problem in the design stage. Compared with the prior art, the beneficial effects of the shaft voltage design verification device provided by the present application are the same as the beneficial effects of the shaft voltage design verification method provided by the above embodiment, and the other technical features in the shaft voltage design verification device are the same as the features disclosed in the above embodiment method, which will not be repeated here.
[0113] The present application provides a shaft voltage design and verification device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the shaft voltage design and verification method in the above-mentioned embodiment one.
[0114] Reference below Figure 6 , which shows a schematic diagram of the structure of a shaft voltage design and verification device suitable for implementing the embodiment of the present application. The shaft voltage design and verification device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The shaft voltage design verification device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.
[0115] like Figure 6As shown, the shaft voltage design verification device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the shaft voltage design verification device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 can allow the shaft voltage design verification device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 6 A shaft voltage design verification device having various systems is shown, but it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may alternatively be implemented or have.
[0116] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.
[0117] The shaft voltage design and verification device provided by the present application adopts the shaft voltage design and verification method in the above embodiment, which can solve the technical problem that it is impossible to perform design verification for the bearing electrical corrosion problem in the design stage. Compared with the prior art, the beneficial effects of the shaft voltage design and verification device provided by the present application are the same as the beneficial effects of the shaft voltage design and verification method provided by the above embodiment, and the other technical features in the shaft voltage design and verification device are the same as the features disclosed in the previous embodiment method, which will not be repeated here.
[0118] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0119] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
[0120] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the shaft voltage design verification method in the above-mentioned embodiment.
[0121] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.
[0122] The computer-readable storage medium may be included in the shaft voltage design and verification device; or may exist independently without being assembled into the shaft voltage design and verification device.
[0123] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the shaft voltage design and verification device, the shaft voltage design and verification device: obtains initial motor design parameters; determines the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance and common mode voltage according to the initial motor design parameters; calculates the shaft voltage according to the rotor-stator winding coupling capacitance, rotor-stator coupling capacitance, equivalent bearing capacitance and common mode voltage; when the shaft voltage is within a preset range, identifies the initial motor design parameters as target motor design parameters, and outputs the target motor design parameters.
[0124] Computer program code for performing the operations of the present application may be written in one or more programming languages or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0125] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.
[0126] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.
[0127] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned shaft voltage design verification method, and can solve the technical problem that it is impossible to perform design verification for the bearing electrical corrosion problem in the design stage. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the shaft voltage design verification method provided by the above-mentioned embodiment, and will not be repeated here.
[0128] The present application also provides a computer program product, including a computer program, which implements the steps of the shaft voltage design verification method as described above when executed by a processor.
[0129] The computer program product provided by this application can solve the technical problem that it is impossible to perform design verification for the bearing electrical corrosion problem in the design stage. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as the beneficial effects of the shaft voltage design verification method provided by the above embodiment, which will not be repeated here.
[0130] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.
Claims
1. A shaft voltage design verification method, characterized in that: The method includes: Obtain initial motor design parameters; Determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters; Calculating the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage; When the shaft voltage is within a preset range, the initial motor design parameters are identified as target motor design parameters, and the target motor design parameters are output.
2. The method according to claim 1, characterized in that The step of obtaining initial motor design parameters comprises: Perform preliminary selection of motor bearings based on actual vehicle requirements and obtain preliminary selection results of motor bearings; Initial motor design parameters are determined based on the preliminary motor bearing selection results.
3. The method according to claim 1, characterized in that The initial motor design parameters include stator parameters, rotor parameters, winding parameters and gap parameters. The step of determining the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters includes: Obtaining a first difference and a first sum through the stator parameters, the winding parameters and the gap parameters; Calculating the rotor-stator winding coupling capacitance according to the stator parameter, the rotor parameter, the first difference value and the first sum value; Obtaining a first product through the stator parameter and the rotor parameter; calculating the rotor-stator coupling capacitance according to the gap parameter and the first product; The equivalent bearing capacitance and common mode voltage are extracted from the initial motor design parameters.
4. The method according to claim 3, characterized in that The step of obtaining a first difference and a first sum through the stator parameters, the winding parameters and the gap parameters comprises: Acquire a stator slot width and a stator slot height from the stator parameters, and calculate a first difference according to the stator slot width and the stator slot height; Acquire a first gap width, a second gap width, and a thickness of a winding insulation layer, wherein the first gap width and the second gap width belong to the gap parameters, and the thickness of the winding insulation layer belongs to the winding parameters; A first sum value is determined according to the stator slot height, the first gap width, the second gap width, and the thickness of the winding insulation layer.
5. The method according to claim 1, characterized in that The step of calculating the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage comprises: Calculating a second sum value according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance and the equivalent bearing capacitance; Calculating a bearing voltage divider ratio according to the rotor-stator winding coupling capacitance and the second sum value; The shaft voltage is obtained by calculating the product of the common mode voltage and the bearing voltage division ratio.
6. The method according to any one of claims 1 to 5, characterized in that After the step of calculating the shaft voltage according to the initial motor design parameters, the method further comprises: When the shaft voltage is not within the preset range, return to the step of obtaining initial motor design parameters.
7. A shaft voltage design and verification device, characterized in that: The device comprises: An initial parameter acquisition module is used to obtain initial motor design parameters; A specific parameter determination module, used to determine the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage according to the initial motor design parameters; A shaft voltage calculation module, used to calculate the shaft voltage according to the rotor-stator winding coupling capacitance, the rotor-stator coupling capacitance, the equivalent bearing capacitance and the common mode voltage; The shaft voltage verification module is used to identify the initial motor design parameters as target motor design parameters when the shaft voltage is within a preset range, and output the target motor design parameters.
8. A shaft voltage design and verification device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the shaft voltage design verification method according to any one of claims 1 to 6.
9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the shaft voltage design and verification method according to any one of claims 1 to 6 are implemented.
10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the shaft voltage design and verification method according to any one of claims 1 to 6 are implemented.