Rotor magnet selection methods, devices, equipment, systems and storage media

Abstract

This application relates to the field of motor equipment technology, and in particular to a method, apparatus, equipment, system, and storage medium for selecting rotor magnets. The method includes: obtaining a rotor test condition table; testing the rotor according to the test condition table and obtaining temperature curves for the magnets at various locations on the rotor; and selecting the target model of the magnets at various locations on the rotor based on the temperature curves. This solves the problems in related technologies where rotor magnets mostly use the same grade of magnets, and the selection is usually based on the highest rotor temperature, which easily leads to overperformance and high cost.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, specifically to a method, apparatus, equipment, system, and storage medium for selecting rotor magnets. Background Technology

[0002] With increasing environmental awareness, new energy vehicles are gradually becoming a focus of attention. Currently, most new energy vehicles use permanent magnet synchronous motors, which mainly consist of a stator, rotor, and housing, with the rotor accounting for a relatively high percentage of the value. The rotor is equipped with permanent magnet material, or magnets, which generate a magnetic field that interacts with the coils on the stator to achieve motor rotation.

[0003] As one of the three main components of a permanent magnet synchronous motor, the quality of the magnet directly affects the motor's performance and efficiency. The following factors need to be considered when selecting magnets: a higher magnetic energy product results in greater motor output power; higher coercivity leads to better magnetic field stability; magnets may be affected by high temperatures during motor operation, therefore, magnets with good temperature stability should be selected; different types of magnets have different prices, so a magnet with a suitable cost should be chosen based on the actual situation.

[0004] However, most rotor magnets on the market currently use the same grade of magnets, such as SH, UH, and EH. But during rotor operation, the temperature of different parts of the rotor is different. Selecting the highest temperature of the rotor as the magnet selection will lead to an overabundance of magnet coercivity, resulting in a double waste of performance and cost. Summary of the Invention

[0005] One objective of this invention is to provide a rotor magnet selection method to solve the problem that in related technologies, rotor magnets mostly use the same grade of magnets, and the highest rotor temperature is usually selected as the magnet selection, which easily leads to overperformance and high cost. The second objective is to provide a rotor magnet selection device. The third objective is to provide a rotor magnet selection equipment. The fourth objective is to provide a rotor magnet selection system. The fifth objective is to provide a computer-readable storage medium.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for selecting rotor magnets includes: obtaining a test condition table of the rotor; testing the rotor according to the test condition table and obtaining temperature curves of the magnets at various locations on the rotor; and selecting the target model of the magnets at various locations on the rotor according to the temperature curves.

[0008] Based on the above-mentioned technical means, the embodiments of this application can measure the operating temperature of the magnets at various parts of the rotor under various working conditions, and provide a basis for the selection of magnets at various parts of the rotor based on the temperature of the magnets at various parts of the rotor. This allows for the selection of different types of magnets that meet the actual needs of the rotor, effectively meeting the optimal needs of each part of the rotor and avoiding the problem of performance overkill caused by using the highest temperature of the rotor as the basis for the selection of all magnets. At the same time, it can also effectively reduce the manufacturing cost of the motor.

[0009] Furthermore, the step of selecting the target model of the magnets at various points on the rotor based on the temperature curve includes: identifying the highest temperature of the temperature curve; and determining the target model of the magnets at various points on the rotor based on the highest temperature.

[0010] Based on the above technical means, embodiments of this application can determine the target model of the magnets at various points on the rotor according to the highest temperature at each point, select a suitable temperature resistance grade for the rotor magnets, improve the quality of magnetic applications, maintain the stability of the magnets, and extend their service life. Further, determining the optimal model of the magnets at various points on the rotor based on the highest temperature includes: obtaining the correspondence between temperature ranges and target magnet models; and determining the target model of the magnet corresponding to the highest temperature based on the temperature range where the highest temperature is located and the correspondence.

[0011] Furthermore, after selecting the optimal model of the magnets at various points on the rotor based on the temperature curve, the process further includes: adjusting the manufacturing material of the rotor according to the optimal model of the magnets at various points; manufacturing a new rotor based on the adjusted manufacturing material, and testing the new rotor according to the test condition table to detect the back electromotive force of the motor before and after the test and whether the magnets have demagnetized; if the back electromotive force is not within the preset range, or if the magnets have demagnetized, then adjusting the target model of the magnets.

[0012] Based on the above technical means, the embodiments of this application manufacture rotors by using the optimal model of magnets and test whether the magnets demagnetize. When the magnets demagnetize, the model of the magnets is adjusted. Thus, the motor can be designed according to the highest temperature and the reverse demagnetization field. The reverse demagnetization can be offset by selecting a model with higher magnet coercivity, thereby achieving high-performance selection of magnets.

[0013] Furthermore, obtaining the test condition table for the rotor includes: pre-calibrating or defining parameters for operation under preset conditions; and generating the test condition table based on the parameters.

[0014] A rotor magnet selection device includes: an acquisition module for acquiring a test condition table of the rotor; a testing module for testing the rotor according to the test condition table and acquiring temperature curves of the magnets at various locations on the rotor; and a selection module for selecting the target model of the magnets at various locations on the rotor according to the temperature curves.

[0015] Furthermore, the selection module is further used to: identify the highest temperature of the temperature curve; and determine the target model of the magnets at various points on the rotor based on the highest temperature.

[0016] Furthermore, the acquisition module is further used to: acquire the correspondence between temperature and target model of magnet; and determine the target model of magnet corresponding to the highest temperature based on the correspondence.

[0017] Furthermore, the testing module is further used to: adjust the manufacturing material of the rotor according to the optimal model of the magnets at each location; manufacture a new rotor according to the adjusted manufacturing material, and test the new rotor according to the test condition table to detect the back electromotive force of the motor and whether the magnets have demagnetized before and after the test; if the back electromotive force is not within the preset range, or if the magnets have demagnetized, then adjust the target model of the magnets.

[0018] A rotor magnet selection device includes: a motor rotor; temperature sensing devices embedded in magnets at various locations on the rotor for detecting temperature signals of the corresponding magnets; a signal acquisition device for acquiring the temperature signals detected by the temperature sensors; and a communication device for transmitting the temperature signals to a host computer. The host computer obtains a test condition table for the rotor, tests the rotor according to the test condition table, acquires temperature curves for the magnets at various locations on the rotor, and selects the target model of the magnets at various locations on the rotor based on the temperature curves. Further, the signal acquisition device is connected to the tail end of the rotor.

[0019] A rotor magnet selection system includes: a rotor magnet selection device; and a host computer for acquiring a rotor test condition table, controlling the rotor magnet selection device to test the rotor according to the test condition table, acquiring temperature curves of magnets at various points on the rotor, and selecting target models of magnets at various points on the rotor according to the temperature curves.

[0020] A computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the rotor magnet selection method as described in the above embodiments.

[0021] The beneficial effects of this invention are:

[0022] (1) The embodiments of this application can measure the operating temperature of the magnets at various parts of the rotor under various working conditions, and provide a basis for the selection of magnets at various parts of the rotor based on the temperature of the magnets at various parts of the rotor. This allows for the selection of different types of magnets that meet the actual needs of the rotor, effectively meeting the optimal needs of the rotor and avoiding the performance overkill problem caused by using the highest temperature of the rotor as the basis for the selection of all magnets. It can also effectively reduce the manufacturing cost of the motor.

[0023] (2) According to the embodiments of this application, the target model of the magnet at each part of the rotor can be determined based on the highest temperature at each part of the rotor, and the appropriate temperature resistance level of the rotor magnet can be selected to improve the quality of magnetic application, while maintaining the stability of the magnet and improving its service life.

[0024] (3) In this embodiment, the rotor is made by using the optimal model of the magnet and the magnet is tested for demagnetization. When the magnet demagnetizes, the model of the magnet is adjusted. Thus, the motor can be designed according to the highest temperature and the reverse demagnetization field. The reverse demagnetization can be offset by selecting a model with higher magnet coercivity, thereby achieving high-performance selection of the magnet.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] Figure 1 A flowchart illustrating a rotor magnet selection method provided in an embodiment of the present invention;

[0027] Figure 2 A flowchart illustrating a rotor magnet selection method provided in one embodiment of the present invention;

[0028] Figure 3 A block diagram of a rotor magnet selection device provided in an embodiment of the present invention;

[0029] Figure 4 A block diagram of a rotor magnet selection device provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a rotor temperature field device provided in one embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of thermocouple pre-embedding provided in one embodiment of the present invention;

[0032] Figure 7 A comparison chart of temperature test results provided in one embodiment of the present invention;

[0033] Figure 8 A block diagram of a rotor magnet selection system provided in an embodiment of the present invention. Detailed Implementation

[0034] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] New energy vehicles, as representatives of environmental protection and energy conservation, are the key development direction of the future automotive industry. The drive motor is an important component of the new energy power system. The rotor accounts for a relatively high value, while the magnet, as one of the three major components of the permanent magnet synchronous motor, accounts for about 30% of the value of the motor body.

[0037] The coercivity of magnets is an important characteristic of magnets, which directly reflects the overall temperature resistance of the rotor. The mainstream magnets on the market are mainly divided into SH, UH and EH. SH has a temperature resistance of 150℃, UH has a temperature resistance of 180℃, and EH has a temperature resistance of 200℃. However, as the temperature resistance level increases, the cost also increases accordingly.

[0038] The embodiments of this application can determine the temperature of each magnet during rotor operation, thereby selecting a more reasonable and cost-effective magnet scheme.

[0039] Currently, most mainstream permanent magnet synchronous motors on the market use the same grade of magnets for all rotor magnets (depending on the electromagnetic scheme and the temperature of the motor rotor, different magnets are selected), without any distinction. However, during operation, the temperature of different parts of the rotor is not the same. Therefore, using the highest rotor temperature as the basis for magnet selection will lead to an overemphasis on the coercivity of the magnets, resulting in a double waste of performance and cost.

[0040] The embodiments of this application aim to use a rotor temperature field device to measure the operating temperature of magnets at various points on the rotor under various operating conditions of the whole machine, thereby providing support for magnet selection and reducing the material cost of motor rotors.

[0041] Specifically, Figure 1 This is a schematic flowchart illustrating a rotor magnet selection method provided in an embodiment of this application.

[0042] like Figure 1As shown, the rotor magnet selection method includes the following steps:

[0043] In step S101, the test condition table of the rotor is obtained.

[0044] The test condition table may include speed and torque, etc., without specific limitations.

[0045] Understandably, the test condition table can be used to provide test conditions for rotor testing, facilitating testing.

[0046] In this embodiment of the application, obtaining the test condition table of the rotor includes: pre-calibrating or defining parameters for operation under preset conditions; and generating the test condition table based on the parameters.

[0047] The preset operating conditions may include reliability operating conditions or defined extreme temperature rise operating conditions. Extreme temperature rise operating conditions refer to the operating conditions where the rotor is in the maximum temperature rise, and can be used to test the rotor's extreme temperature.

[0048] It is understood that the embodiments of this application can operate under reliable operating conditions or defined extreme temperature rise conditions, collect parameters, and generate a test condition table. Since the test condition table is obtained based on the calibration or definition of reliable operating conditions or extreme temperature rise conditions, more reliable or representative test conditions can be obtained, improving the accuracy of the test. Furthermore, the test condition table can improve the convenience of the test, eliminating the need to involve the test conditions during the test. The test condition table can be as shown in Table 1, which is an example of a test condition table.

[0049] Table 1

[0050]

[0051]

[0052] It should be noted that rotor operation can be tested on a test bench or in a complete vehicle, which facilitates the evaluation and improvement of the performance of new energy vehicles and enhances the reliability of the motor.

[0053] In step S102, the rotor is tested according to the test condition table, and the temperature curves of the magnets at various points on the rotor are obtained.

[0054] It is understood that the embodiments of this application can test the rotor to obtain the temperature curves of the magnets at various parts of the rotor. Since the temperature of different parts of the rotor is not the same when the rotor is running, the operating temperature of the magnets at various parts of the rotor under various working conditions can be measured, and the selection of magnets at various parts of the rotor can be based on the temperature of the magnets at various parts of the rotor.

[0055] In step S103, the target model of the magnets at various points on the rotor is selected based on the temperature curve.

[0056] The target model can include SH grade magnets, UH grade magnets, and EH grade magnets, etc., without specific limitations.

[0057] It is understood that the embodiments of this application can determine the magnet selection based on the temperature curve, and determine the target model of the magnet at each part of the rotor by the temperature of the magnet at each part of the rotor, thereby avoiding the problem of performance overkill caused by using the highest temperature of the rotor as the basis for all magnet selection.

[0058] In this embodiment of the application, selecting the target model of the magnets at various points on the rotor based on the temperature curve includes: identifying the highest temperature of the temperature curve; and determining the target model of the magnets at various points on the rotor based on the highest temperature.

[0059] It is understood that, according to the embodiments of this application, the target model of the magnets at each part of the rotor can be determined based on the highest temperature at each part of the rotor, and the appropriate temperature resistance level of the rotor magnets can be selected to improve the quality of magnetic applications, while maintaining the stability of the magnets and increasing their service life.

[0060] For example, embodiments of this application may provide three selectable target models of magnets, such as SH grade magnets, UH grade magnets and EH grade magnets, wherein the temperature resistance of SH grade magnets is 150°C, the temperature resistance of UH grade magnets is 180°C, and the temperature resistance of EH grade magnets is 200°C.

[0061] When the highest temperature on the temperature curve is 130℃, this highest temperature is lower than the temperature resistance temperature of the SH grade magnet, therefore the optimal target model for the rotor magnet here is the SH grade magnet; when the highest temperature on the temperature curve is 160℃, this highest temperature is higher than the temperature resistance temperature of the SH grade magnet and lower than the temperature resistance temperature of the UH grade magnet, therefore the optimal target model for the rotor magnet here is the UH grade magnet; when the highest temperature on the temperature curve is 195℃, this highest temperature is lower than the temperature resistance temperature of the EH grade magnet, therefore the optimal target model for the rotor magnet here is the EH grade magnet.

[0062] In this embodiment of the application, determining the optimal model of the magnets at various locations on the rotor based on the highest temperature includes: obtaining the correspondence between temperature ranges and target models of magnets; and determining the target model of the magnet corresponding to the highest temperature based on the temperature range where the highest temperature is located and the correspondence.

[0063] It is understood that the embodiments of this application can also pre-determine the correspondence between temperature and target magnet model, so as to quickly and accurately select the best target magnet model for each location based on the correspondence.

[0064] For example, embodiments of this application may provide three selectable target models of magnets, such as SH grade magnets, UH grade magnets and EH grade magnets, wherein the temperature resistance of SH grade magnets is 150°C, the temperature resistance of UH grade magnets is 180°C, and the temperature resistance of EH grade magnets is 200°C.

[0065] To quickly select the target model of the magnet, this embodiment of the application can set different temperature ranges and corresponding target models according to the available target models of the magnet. The first temperature range can be set to below 150°C, the second temperature range to 150-180°C (excluding 150°C), and the third temperature range to 180-200°C (excluding 180°C). The target model corresponding to the first temperature range is SH grade magnet, the target model corresponding to the second temperature range is UH grade magnet, and the target model corresponding to the third temperature range is EH grade magnet.

[0066] When the highest temperature on the temperature curve is 130℃, 130℃ falls within the first temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 130℃ is determined to be SH grade magnet. When the highest temperature on the temperature curve is 160℃, 160℃ falls within the second temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 160℃ is determined to be UH grade magnet. When the highest temperature on the temperature curve is 195℃, 195℃ falls within the third temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 195℃ is determined to be EH grade magnet.

[0067] In this embodiment of the application, after selecting the optimal model of the magnets at each part of the rotor according to the temperature curve, the method further includes: adjusting the manufacturing material of the rotor according to the optimal model of the magnets at each part; manufacturing a new rotor according to the adjusted manufacturing material, and testing the new rotor according to the test condition table to detect the back electromotive force of the motor before and after the test and whether the magnets have demagnetized; if the back electromotive force is not within the preset range, or if the magnets have demagnetized, then adjusting the target model of the magnets.

[0068] The preset range can be [30°, 90°], etc., without specific limitations.

[0069] It is understood that the embodiments of this application manufacture rotors using the optimal model of magnets and test whether the magnets demagnetize. When the magnets demagnetize, the model of the magnets is adjusted. Thus, the motor can be designed according to the highest temperature and the reverse demagnetization field. The reverse demagnetization can be offset by selecting a model with higher magnet coercivity, thereby achieving high-performance selection of magnets.

[0070] It should be noted that if the back electromotive force is not within the preset range, or if the magnet demagnetizes, the target model of the magnet should be adjusted. The optimal model of the magnet at each part of the rotor is determined by the highest temperature and the reverse demagnetizing field. The target model of the magnet is determined by selecting the temperature range and corresponding relationship of the stage above the highest temperature.

[0071] For example, embodiments of this application may provide three selectable target models of magnets, such as SH grade magnets, UH grade magnets and EH grade magnets, wherein the temperature resistance of SH grade magnets is 150°C, the temperature resistance of UH grade magnets is 180°C, and the temperature resistance of EH grade magnets is 200°C.

[0072] In this embodiment, the first temperature range can be set to below 150°C, the second temperature range to 150-180°C (excluding 150°C), and the third temperature range to 180-200°C (excluding 180°C). The target model corresponding to the first temperature range is SH grade magnet, the target model corresponding to the second temperature range is UH grade magnet, and the target model corresponding to the third temperature range is EH grade magnet.

[0073] When the highest temperature on the temperature curve is 130℃, 130℃ falls within the first temperature range. When the back electromotive force of the motor before and after testing is detected, it is determined that the magnet has demagnetized. The target model of the magnet needs to be adjusted. The target model of the magnet is determined by selecting the temperature range above the highest temperature and the corresponding relationship. Therefore, based on the second temperature range and the corresponding relationship, the optimal target model corresponding to 130℃ is UH grade magnet. When the highest temperature on the temperature curve is 160℃, 160℃ falls within the second temperature range. When the back electromotive force of the motor before and after testing is detected, the magnet has demagnetized. The target model of the magnet needs to be adjusted. The target model of the magnet is determined by selecting the temperature range above the highest temperature and the corresponding relationship. Therefore, based on the third temperature range and the corresponding relationship, the optimal target model corresponding to 160℃ is EH grade magnet.

[0074] According to the embodiments of this application, a rotor magnet selection method is proposed. By measuring the operating temperature of the magnets at various locations on the rotor under various working conditions, the selection of magnets at each location is based on the temperature of the magnets. This allows for the selection of different types of magnets that meet the actual needs of the rotor, effectively meeting the optimal requirements of each part of the rotor. This avoids the problem of performance overkill caused by using the highest rotor temperature as the basis for selecting all magnets, and also effectively reduces the manufacturing cost of the motor. Thus, it solves the problem in related technologies where the rotor magnets mostly use the same grade of magnets, and the highest rotor temperature is usually used as the basis for magnet selection, which easily leads to performance overkill and high cost.

[0075] The rotor magnet selection method of this application is illustrated below through a specific embodiment, such as... Figure 2As shown, it includes the following steps:

[0076] S201: Rotor pre-embedded thermocouples are pre-embedded in the magnets of the rotor in the windings of the motor to directly measure the temperature value and achieve protection.

[0077] S202: Assemble the electric bridge, assemble the rotor assembly into a drive electric bridge, and turn on the temperature acquisition equipment to make the electric bridge operate according to the reliability conditions or the defined extreme temperature rise conditions.

[0078] S203: Operating condition test, magnet temperature recording, operating condition test of rotor speed, torque and time, and collection and recording of temperature curves of magnets at various parts of rotor;

[0079] S204: Magnet selection. Three target models of magnets are available, such as SH grade magnets, UH grade magnets and EH grade magnets. Among them, the temperature resistance of SH grade magnets is 150℃, the temperature resistance of UH grade magnets is 180℃, and the temperature resistance of EH grade magnets is 200℃.

[0080] In this embodiment, the first temperature range can be set to below 150°C, the second temperature range to 150-180°C (excluding 150°C), and the third temperature range to 180-200°C (excluding 180°C). The target model corresponding to the first temperature range is SH grade magnet, the target model corresponding to the second temperature range is UH grade magnet, and the target model corresponding to the third temperature range is EH grade magnet.

[0081] When the highest temperature on the temperature curve is 130℃, 130℃ falls within the first temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 130℃ is determined to be SH grade magnet. When the highest temperature on the temperature curve is 160℃, 160℃ falls within the second temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 160℃ is determined to be UH grade magnet. When the highest temperature on the temperature curve is 195℃, 195℃ falls within the third temperature range. Therefore, based on the temperature range and its corresponding relationship, the optimal target model for 195℃ is determined to be EH grade magnet.

[0082] S205: Re-produce the rotor. After selecting the best target model, adjust the rotor BOM, manufacture the new rotor, and retest it.

[0083] S206: Assemble the electric drive assembly, including the drive motor assembly, controller assembly, and transmission assembly, to achieve control of the drive motor;

[0084] S207: Operate according to the operating conditions and requirements, operate according to the reliability operating conditions or the defined extreme temperature rise operating conditions, collect parameters to generate a test condition table. Since the test condition table is based on the reliability operating conditions or the extreme temperature rise operating conditions, more reliable or representative test conditions can be obtained.

[0085] S208: Check the motor's back electromotive force (EMF). Back EMF is generated on the rotor only when there are windings on the rotor and the rotor speed differs from the magnetic field speed. At this time, the back EMF of the motor before and after testing is measured. If the back EMF is not within the preset range, or if the magnets have demagnetized, the target magnet model is adjusted. To confirm whether the magnets have demagnetized, the magnet model is adjusted if demagnetization has occurred. This allows the motor to be designed based on the highest temperature and the reverse demagnetization field, and the reverse demagnetization can be counteracted by selecting a model with higher magnet coercivity.

[0086] Next, the rotor magnet selection device according to the embodiments of this application is described with reference to the accompanying drawings.

[0087] Figure 3 This is a block diagram of a rotor magnet selection device according to an embodiment of this application.

[0088] like Figure 3 As shown, the rotor magnet selection device 10 includes: an acquisition module 100, a testing module 200, and a selection module 300.

[0089] The acquisition module 100 is used to acquire the test condition table of the rotor; the test module 200 is used to test the rotor according to the test condition table and acquire the temperature curves of the magnets at various parts of the rotor; the selection module 300 is used to select the target model of the magnets at various parts of the rotor according to the temperature curves.

[0090] In this embodiment, the selection module 300 is further used to identify the highest temperature of the temperature curve; and to determine the target model of the magnets at various points on the rotor based on the highest temperature.

[0091] In this embodiment of the application, the acquisition module 100 is further used to acquire the correspondence between temperature and target model of magnet; and to determine the target model of magnet corresponding to the highest temperature according to the correspondence.

[0092] In this embodiment of the application, the test module 200 is further used to adjust the manufacturing material of the rotor according to the optimal model of the magnets at each location; to manufacture a new rotor according to the adjusted manufacturing material, and to test the new rotor according to the test condition table, and to detect the back electromotive force of the motor before and after the test and whether the magnets have demagnetized; if the back electromotive force is not within the preset range, or if the magnets have demagnetized, then the target model of the magnets is adjusted.

[0093] It should be noted that the foregoing explanation of the rotor magnet selection method embodiment also applies to the rotor magnet selection device of this embodiment, and will not be repeated here.

[0094] According to the rotor magnet selection device proposed in the embodiments of this application, by measuring the operating temperature of the magnets at various parts of the rotor under various working conditions, the device provides a basis for selecting magnets at each part of the rotor based on the temperature of the magnets at each part of the rotor. This allows for the selection of different types of magnets that meet the actual needs of the rotor, effectively meeting the optimal requirements of each part of the rotor and avoiding the problem of performance overkill caused by using the highest rotor temperature as the basis for selecting all magnets. At the same time, it can also effectively reduce the manufacturing cost of the motor. Thus, it solves the problem in related technologies where the rotor magnets mostly use the same grade of magnets and usually use the highest rotor temperature as the magnet selection, which easily leads to performance overkill and high cost.

[0095] Figure 4 This is a block diagram of a rotor magnet selection device according to an embodiment of this application.

[0096] like Figure 4 As shown, the rotor magnet selection equipment includes: motor rotor, temperature sensing device, signal acquisition device and communication device.

[0097] Among them, the temperature sensing device embedded in the magnets at various points of the rotor is used to detect the temperature signal of the corresponding magnet; the signal acquisition device is used to collect the temperature signal detected by the temperature sensor; the communication device is used to send the temperature signal to the host computer. The host computer obtains the test condition table of the rotor, tests the rotor according to the test condition table, and obtains the temperature curve of the magnets at various points of the rotor. Based on the temperature curve, the target model of the magnets at various points of the rotor is selected.

[0098] In this embodiment of the application, the rotor magnet selection device further includes a signal acquisition device connected to the tail end of the rotor.

[0099] The rotor magnet selection device proposed in this application measures the operating temperature of magnets at various points on the rotor under various working conditions. Based on the temperature of the magnets at various points on the rotor, it provides a basis for selecting magnets at each point. This allows for the selection of different types of magnets that meet the actual needs of the rotor, effectively meeting the optimal requirements of each part of the rotor. It avoids the problem of performance overkill caused by using the highest rotor temperature as the basis for selecting all magnets, and can also effectively reduce the manufacturing cost of the motor. Thus, it solves the problem in related technologies where rotor magnets mostly use the same grade of magnets, and the highest rotor temperature is usually used as the basis for magnet selection, which easily leads to performance overkill and high cost.

[0100] The rotor magnet selection device of this application is illustrated below through a specific embodiment, including the following:

[0101] The principle of rotor temperature measuring equipment, such as Figure 5 As shown, thermocouples are pre-embedded into the magnets at various locations on the rotor, and the pre-embedding method is as follows. Figure 6 As shown, a temperature acquisition device is connected to the tail end of the rotor. The rotor assembly is then assembled into a drive bridge, and the temperature acquisition device is activated. The bridge is operated under reliable operating conditions or defined extreme temperature rise conditions to acquire the temperature curves of magnets 1, 2, 3, and 4, as shown. Figure 7 As shown; based on the tested magnet temperatures, the highest temperature at magnets 1 and 2 is 166℃, so UH grade magnets should be selected; since the highest temperature at magnets 3 and 4 does not exceed 150℃, SH grade magnets can be selected, thus selecting the magnet grades for each location; after selecting the magnets, adjust the rotor BOM, manufacture a new rotor, and then retest the above operating conditions, checking the motor back EMF before and after the test to confirm whether the magnets have demagnetized.

[0102] Figure 8 This is a block diagram of the rotor magnet selection system according to an embodiment of this application.

[0103] like Figure 8 As shown, the rotor magnet selection system includes: rotor magnet selection equipment and host computer.

[0104] The host computer is used to obtain the rotor's test condition table, control the rotor magnet selection equipment to test the rotor according to the test condition table, obtain the temperature curves of the magnets at various parts of the rotor, and select the target model of the magnets at various parts of the rotor according to the temperature curves.

[0105] The rotor magnet selection system proposed in this application measures the operating temperature of magnets at various locations on the rotor under different operating conditions. Based on the temperature of the magnets at each location, the system provides a basis for selecting magnets of different models to meet actual needs. This effectively meets the optimal requirements of each part of the rotor, avoiding the problem of performance overkill caused by using the highest rotor temperature as the basis for all magnet selections. It also effectively reduces the manufacturing cost of the motor. Therefore, it solves the problem in related technologies where rotor magnets mostly use the same grade of magnets, and the highest rotor temperature is typically used for magnet selection, which easily leads to performance overkill and high costs.

[0106] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described rotor magnet selection method.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0109] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0110] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0111] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0112] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A rotor magnet selection method, characterized by, Includes the following steps: Obtain the rotor's test condition table; The rotor was tested according to the test condition table, and the temperature curves of the magnets at various points on the rotor were obtained. Select the target model of the magnets at various points on the rotor based on the temperature curve; After selecting the target model of the magnets at various points on the rotor based on the temperature curve, the process also includes: The manufacturing material of the rotor is adjusted according to the target model of the magnets at each location; The new rotor is manufactured according to the adjusted manufacturing materials, and the new rotor is tested according to the test condition table to detect the back electromotive force of the motor and whether the magnets demagnetize before and after the test. If the back electromotive force is not within the preset range, or if the magnet demagnetizes, then the target model of the magnet is adjusted.

2. The method of claim 1, wherein, The step of selecting the target model of the magnets at various points on the rotor based on the temperature curve includes: Identify the highest temperature of the temperature curve; The target model of the magnets at each part of the rotor is determined based on the highest temperature.

3. The method of claim 2, wherein, The determination of the target model of the magnets at various points on the rotor based on the highest temperature includes: Obtain the correspondence between temperature ranges and target magnet models; The target model of the magnet corresponding to the highest temperature is determined based on the temperature range in which the highest temperature is located and the corresponding relationship.

4. The method of claim 1, wherein, The test condition table for obtaining the rotor includes: Pre-calibrate or define the parameters for operation under preset conditions; The test condition table is generated based on the parameters.

5. A rotor magnet selection device, characterized in that, To implement the rotor magnet selection method as described in any one of claims 1-4, the method includes: The acquisition module is used to acquire the test condition table of the rotor; The testing module is used to test the rotor according to the test condition table and obtain the temperature curves of the magnets at various points on the rotor. The selection module is used to select the target model of the magnets at various points on the rotor based on the temperature curve.

6. A rotor magnet selection device, characterized in that, To implement the rotor magnet selection method as described in any one of claims 1-4, the method includes: Motor rotor; Temperature sensing devices are pre-embedded in the magnets at various points on the rotor to detect the temperature signals of the corresponding magnets; A signal acquisition device is used to acquire the temperature signal detected by the temperature sensing device; A communication device is used to send the temperature signal to a host computer, wherein the host computer obtains the test condition table of the rotor, tests the rotor according to the test condition table, obtains the temperature curves of the magnets at various points on the rotor, and selects the target model of the magnets at various points on the rotor according to the temperature curves.

7. The rotor magnet selection device according to claim 6, characterized in that, The rotor tail end is connected to a signal acquisition device.

8. A rotor magnet selection system, characterized in that, include: The rotor magnet selection device as described in claim 6 or 7; The host computer is used to obtain the test condition table of the rotor, control the rotor magnet selection equipment to test the rotor according to the test condition table, obtain the temperature curve of the magnet at various parts of the rotor, and select the target model of the magnet at various parts of the rotor according to the temperature curve.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the rotor magnet selection method as described in any one of claims 1-4.

Images