Dual-stator excitation magnetic field modulation motor control method, system, device and medium

Abstract

The present invention discloses a control method, system, device, and medium for a dual-stator excitation magnetic field modulation motor, wherein the method comprises: obtaining a current control function, which is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula, with the goal of minimizing the motor thermal load during the conversion process, and is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current; obtaining the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and then determining the target inner stator phase current and target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function; and adjusting the operating state of the dual-stator excitation magnetic field modulation motor according to a preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current. The present invention can alleviate the heating phenomenon generated by the dual-stator excitation magnetic field modulation motor during stable operation and reduce the risk of thermal demagnetization.

Description

Technical Field

[0001] The present invention relates to the field of motor control technology, and in particular to a dual-stator excitation magnetic field modulation motor control method, system, equipment and medium. Background Art

[0002] In industries such as electric vehicles and aerospace, a magnetic field-modulated permanent magnet synchronous motor with a dual-stator excitation structure can be used as the primary power source. Compared to conventional internal permanent magnet synchronous motors, this method uses a combined internal and external stator excitation method to reduce magnetic flux leakage from the rotor permanent magnets, thereby increasing permanent magnet utilization. It also utilizes the fundamental wave and its lower harmonics to enhance the motor's output torque and reduce the number of permanent magnets required. However, the combined internal and external stator excitation method causes the permanent magnets in the middle of the motor to be affected by two heat sources: the internal and external windings. Existing motor control strategies rarely consider motor heating, increasing the risk of thermal demagnetization during operation. Summary of the Invention

[0003] The present invention provides a dual-stator excitation magnetic field modulation motor control method, system, device and medium to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0004] In a first aspect, a method for controlling a dual-stator excitation magnetic field modulation motor is provided, the method comprising:

[0005] Obtaining a current control function, wherein the current control function is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula, with the goal of minimizing the motor thermal load during the conversion process, and is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current;

[0006] Obtaining the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and determining the target inner stator phase current and the target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function;

[0007] The operating state of the dual-stator excitation magnetic field modulation motor is adjusted according to the preset maximum motor phase current, the target inner stator phase current and the target outer stator phase current.

[0008] Furthermore, the current control function is obtained in the following manner:

[0009] Obtaining basic parameters of the dual-stator excitation magnetic field modulation motor, and then determining the electromagnetic torque function and thermal load function of the dual-stator excitation magnetic field modulation motor in combination with the motor electromagnetic torque formula and the motor thermal load formula;

[0010] With the goal of minimizing the thermal load of the motor, the electromagnetic torque function and the thermal load function are fused and analyzed to obtain a first current function, where the first current function is used to characterize the relationship between the electromagnetic torque of the motor and the stator phase current in the motor;

[0011] The electromagnetic torque function and the first current function are fused and converted to obtain a second current function, where the second current function is used to characterize the relationship between the electromagnetic torque of the motor and the external stator phase current of the motor;

[0012] The first current function and the second current function constitute the current control function.

[0013] Furthermore, the basic parameters include first basic parameters for assisting in determining the electromagnetic torque function, and the first basic parameters include the number of pole pairs and the permanent magnet flux linkage.

[0014] Furthermore, the basic parameters include a second basic parameter for assisting in determining the thermal load function, wherein the second basic parameter includes the number of slots, the number of parallel branches, the inner diameter of the outer stator, the inner diameter of the inner stator, the cross-sectional area of ​​one turn of coil in the outer stator winding, and the cross-sectional area of ​​one turn of coil in the inner stator winding.

[0015] Furthermore, with the goal of minimizing the thermal load of the motor, the electromagnetic torque function and the thermal load function are integrated and analyzed to obtain the first current function, which includes:

[0016] The electromagnetic torque function and the heat load function are fused and converted to obtain a first heat load function, where the first heat load function is used to characterize the relationship between the heat load of the motor, the electromagnetic torque of the motor and the stator phase current in the motor;

[0017] With the goal of minimizing the thermal load of the motor, the first thermal load function is analyzed to decompose the first current function therefrom.

[0018] Furthermore, the adjusting the operating state of the dual-stator excitation magnetic field modulation motor according to the preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current includes:

[0019] determining an optimal inner stator phase current and an optimal outer stator phase current according to a relationship among the maximum phase current of the motor, the target inner stator phase current, and the target outer stator phase current;

[0020] The dual-stator excitation magnetic field modulation motor is controlled to operate according to the optimal inner stator phase current and the optimal outer stator phase current.

[0021] Furthermore, determining the optimal inner stator phase current and the optimal outer stator phase current according to the relationship among the maximum phase current of the motor, the target inner stator phase current, and the target outer stator phase current includes:

[0022] Adding the target inner stator phase current and the target outer stator phase current, and determining whether the added result is less than or equal to the maximum phase current of the motor;

[0023] If so, the target inner stator phase current is used as the optimal inner stator phase current, and the target outer stator phase current is used as the optimal outer stator phase current;

[0024] If not, the maximum phase current of the motor is distributed according to the ratio between the target inner stator phase current and the target outer stator phase current to obtain the optimal inner stator phase current and the optimal outer stator phase current.

[0025] In a second aspect, a dual-stator excitation magnetic field modulation motor control system is provided, the system comprising:

[0026] The first module is used to obtain a current control function. The current control function is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula. During the conversion process, the motor thermal load is minimized as the goal. The current control function is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current.

[0027] The second module is used to obtain the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and determine the target inner stator phase current and the target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function;

[0028] The third module is used to adjust the operating state of the dual-stator excitation magnetic field modulation motor according to the preset maximum phase current of the motor, the target inner stator phase current and the target outer stator phase current.

[0029] In a third aspect, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the dual-stator excitation magnetic field modulation motor control method as described in the first aspect.

[0030] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the dual-stator excitation magnetic field modulation motor control method as described in the first aspect is implemented.

[0031] The present invention has at least the following beneficial effects: while taking into account the electromagnetic torque and thermal load of the dual-stator excitation magnetic field modulation motor at the same time, by minimizing the motor thermal load as the goal in the operation control stage of the dual-stator excitation magnetic field modulation motor, and using the preset motor maximum phase current as the constraint condition, the internal and external stator phase currents of the dual-stator excitation magnetic field modulation motor are reasonably formulated, which can ensure the operation stability of the dual-stator excitation magnetic field modulation motor, and effectively alleviate the heat generated by the dual-stator excitation magnetic field modulation motor during operation, thereby reducing the risk of thermal demagnetization. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0033] Figure 1 1 is a flow chart of a method for controlling a dual-stator excitation magnetic field modulation motor according to an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the composition of a dual-stator excitation magnetic field modulation motor control system in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the hardware structure of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0037] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that in the flowchart. The terms "first," "second," and the like in the specification, claims, and drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described herein.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0039] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0040] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0041] Please refer to Figure 1 , Figure 1 1 is a flow chart of a method for controlling a dual-stator excitation magnetic field modulation motor provided by an embodiment of the present invention, the method comprising the following steps:

[0042] Step S110: Obtain a current control function, where the current control function is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula, with the goal of minimizing the motor thermal load during the conversion process, and is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current;

[0043] Step S120: obtaining the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and then determining the target inner stator phase current and the target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function;

[0044] Step S130 : adjusting the operating state of the dual-stator excitation magnetic field modulation motor according to the preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current.

[0045] Taking a general-purpose permanent magnet synchronous motor as an example, the motor electromagnetic torque formula and the motor thermal load formula mentioned in step S110 are explained as follows:

[0046] ①The conventional formula for motor electromagnetic torque is:

[0047]

[0048] Where, T is the electromagnetic torque of the motor, p is the number of motor pole pairs, is the permanent magnet flux of the motor, i d is the motor direct axis current, i q is the motor quadrature axis current, Ld is the motor direct axis inductance, L q is the quadrature-axis inductance of the motor;

[0049] Motor direct axis current i d , motor quadrature axis current i q The relationship between the effective value of the motor phase current is:

[0050]

[0051] In general, the motor direct axis inductance L d and the motor's quadrature-axis inductance L q The difference between them is small, and the motor direct axis current i can be set d is zero, and the final required motor electromagnetic torque formula is obtained by combining the above formula (1) and the above formula (2):

[0052]

[0053] Where, I is the effective value of the motor phase current, C T is the electromagnetic torque constant of the motor;

[0054] ②The motor thermal load formula is:

[0055]

[0056] Where AJ is the motor thermal load, C AJ is the motor stator thermal load constant, Z is the number of motor slots, N BL is the number of parallel branches of the motor, D SI is the inner diameter of the motor stator, S co is the cross-sectional area of ​​one turn of coil in the motor stator winding.

[0057] In some embodiments, the current control function mentioned in step S110 is composed of a first current function and a second current function. The first current function mainly represents the relationship between the stator phase current inside the motor and the electromagnetic torque of the motor. The second current function mainly represents the relationship between the stator phase current outside the motor and the electromagnetic torque of the motor. The generation process of the current control function includes but is not limited to the following:

[0058] Step S111: obtaining basic parameters of the dual-stator excitation magnetic field modulation motor, and then determining a thermal load function and an electromagnetic torque function of the dual-stator excitation magnetic field modulation motor in combination with a motor thermal load formula and a motor electromagnetic torque formula;

[0059] More specifically, the dual-stator excitation magnetic field modulation motor adopts a double stator structure, and its basic parameters include a first basic parameter and a second basic parameter. The first basic parameter includes the permanent magnet flux of the dual-stator excitation magnetic field modulation motor. and the pole pair number p d The second basic parameter includes the number of parallel branches N of the dual-stator excitation magnetic field modulation motor. BLd , number of slots Z d , inner stator inner diameter D SI1 、Inner diameter of outer stator D SI2 , the cross-sectional area S of a turn of coil in the inner stator winding co1 and the cross-sectional area S of one turn of the outer stator winding co2 ;

[0060] Combining the first basic parameter of the dual-stator excitation magnetic field modulation motor and the motor electromagnetic torque formula (i.e., the above formula (3)), the electromagnetic torque function of the dual-stator excitation magnetic field modulation motor is determined as:

[0061]

[0062] Where, T total is the electromagnetic torque of the dual-stator excitation magnetic field modulation motor, C Td is the electromagnetic torque constant of the dual-stator excitation magnetic field modulation motor, I s1 is the inner stator phase current of the dual stator excitation magnetic field modulation motor, I s2 The outer stator phase current of the dual stator excitation field modulation motor;

[0063] Combined with the second basic parameter of the dual-stator excitation magnetic field modulation motor and the motor thermal load formula (i.e., the above formula (4)), the thermal load function of the dual-stator excitation magnetic field modulation motor is determined as:

[0064]

[0065] Where AJ total is the heat load of the double-stator excitation magnetic field modulation motor, C AJ_s1 is the internal stator heat load constant of the double-stator excitation magnetic field modulation motor, C AJ_s2 is the outer stator thermal load constant of the double-stator excitation field modulation motor.

[0066] Step S112: with the goal of minimizing the thermal load of the motor, the thermal load function and the electromagnetic torque function are integrated and analyzed to obtain a first current function;

[0067] More specifically, the thermal load function and the electromagnetic torque function are firstly fused and transformed, that is, the above formula (5) is substituted into the above formula (6) for conversion derivation, and the outer stator phase current I s2 , the first heat load function is obtained as:

[0068] AJ total =X+Y,

[0069]

[0070] In the formula, X and Y are reference parameters set for the convenience of description. Since the internal stator heat load constant C of the double stator excitation magnetic field modulation motor is AJ_s1 and external stator heat load constant C AJ_s2 Generally, it is greater than 1, indicating that the value of parameter X may be 0 or greater than 0, specifically according to the inner stator phase current I of the dual stator excitation magnetic field modulation motor. s1 and electromagnetic torque T total Due to the dual stator excitation magnetic field modulation, the electromagnetic torque T generated by the motor during operation is total It is basically not 0, which means that the value of parameter Y will be greater than 0, that is, the thermal load AJ of the double stator excitation magnetic field modulation motor total The minimum value of will be greater than 0;

[0071] Secondly, the first heat load function is analyzed. Considering that in general, only the reference parameter X may take the value of 0, and the values ​​of the basic parameters of the dual-stator excitation magnetic field modulation motor are fixed, in order to make the heat load AJ of the dual-stator excitation magnetic field modulation motor total To reach the minimum value, the following conditions must be met:

[0072]

[0073] From this, the first current function required can be decomposed into the following:

[0074]

[0075] Where C1 is a reference parameter set for the convenience of description.

[0076] Step S113: The first current function and the electromagnetic torque function are fused and converted, that is, the above formula (9) is substituted into the above formula (5) for conversion and derivation, and the inner stator phase current I that appears in the above formula (5) is eliminated. s1 , the second current function is obtained as:

[0077]

[0078] In some embodiments, the implementation process of step S120 includes but is not limited to the following:

[0079] Step S121, obtaining the current electrical angle of the dual-stator excitation magnetic field modulation motor, and calculating the current speed of the dual-stator excitation magnetic field modulation motor according to the current electrical angle;

[0080] Step S122: Calculate the deviation between the preset target speed and the current speed, and then input the deviation into the speed loop PI controller for processing to obtain the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor;

[0081] Step S123: Substitute the current electromagnetic torque into the first current function to solve it, and obtain the target inner stator phase current of the dual-stator excitation magnetic field modulation motor;

[0082] Step S124: Substitute the current electromagnetic torque into the second current function to solve it, and obtain the target outer stator phase current of the dual-stator excitation magnetic field modulation motor.

[0083] In some embodiments, the implementation process of step S130 includes but is not limited to the following:

[0084] Step S131: determining an optimal outer stator phase current and an optimal inner stator phase current according to a relationship among a target outer stator phase current, a target inner stator phase current, and a maximum phase current of the motor;

[0085] More specifically, the target outer stator phase current and the target inner stator phase current are summed, and then it is determined whether the summation result is less than or equal to the maximum phase current of the motor; if so, the target outer stator phase current is directly defined as the optimal outer stator phase current, and the target inner stator phase current is directly defined as the optimal inner stator phase current; if not, the maximum phase current of the motor is distributed according to the ratio between the target outer stator phase current and the target inner stator phase current to obtain the optimal outer stator phase current and the optimal inner stator phase current.

[0086] For example, according to the ratio between the target outer stator phase current and the target inner stator phase current being M:N, the maximum phase current of the motor is recorded as I max , determine the optimal external stator phase current as I max *[M / (M+N)], and determine the optimal inner stator phase current as I max *[N / (M+N)].

[0087] Step S132: Control the operation of the dual-stator excitation magnetic field modulation motor according to the optimal outer stator phase current and the optimal inner stator phase current. The specific performance is as follows:

[0088] First of all, it should be noted that the optimal outer stator phase current is actually the target outer stator q-axis current component. The target outer stator d-axis current component is set to zero. The target outer stator d-axis current component and the target outer stator d-axis current component are collectively referred to as the target outer stator dq-axis current component. The optimal inner stator phase current is actually the target inner stator q-axis current component. The target inner stator d-axis current component is set to zero. The target inner stator q-axis current component and the target inner stator d-axis current component are collectively referred to as the target inner stator dq-axis current component.

[0089] (1) Obtaining the current outer stator three-phase current and the current inner stator three-phase current of the dual-stator excitation magnetic field modulation motor, performing Clark transformation on the current outer stator three-phase current to obtain the current outer stator αβ axis current components, and performing Clark transformation on the current inner stator three-phase current to obtain the current inner stator αβ axis current components;

[0090] (2) Obtain the current electrical angle of the dual-stator excitation magnetic field modulation motor, then perform Park transformation on the current outer stator αβ axis current components to obtain the current outer stator dq axis current components, and perform Park transformation on the current inner stator αβ axis current components to obtain the current inner stator dq axis current components;

[0091] (3) calculating a first deviation between the target outer stator dq axis current component and the current outer stator dq axis current component, and then inputting the first deviation into the current loop PI controller for processing to obtain the current outer stator dq axis voltage component; and calculating a second deviation between the target inner stator dq axis current component and the current inner stator dq axis current component, and then inputting the second deviation into the current loop PI controller for processing to obtain the current inner stator dq axis voltage component;

[0092] (4) performing an inverse Park transform on the current outer stator dq axis voltage components to obtain the current outer stator αβ axis voltage components, and performing an inverse Park transform on the current inner stator dq axis voltage components to obtain the current inner stator αβ axis voltage components;

[0093] (5) The current outer stator αβ axis voltage components are input into the SVPWM (Space Vector Pulse Width Modulation) module for processing to obtain the current outer stator three-phase voltage, and the current inner stator αβ axis voltage components are input into the SVPWM module for processing to obtain the current inner stator three-phase voltage, and then the current outer stator three-phase voltage and the current inner stator three-phase voltage are used to drive the dual-stator excitation magnetic field modulation motor to rotate.

[0094] In an embodiment of the present invention, while taking into account the electromagnetic torque and thermal load of the dual-stator excitation magnetic field modulation motor, by minimizing the motor thermal load as a goal in the operation control stage of the dual-stator excitation magnetic field modulation motor, and using the preset maximum motor phase current as a constraint condition, the internal and external stator phase currents of the dual-stator excitation magnetic field modulation motor are reasonably formulated, thereby ensuring the operation stability of the dual-stator excitation magnetic field modulation motor, and effectively alleviating the heat generated by the dual-stator excitation magnetic field modulation motor during operation, thereby reducing the risk of thermal demagnetization.

[0095] Please refer to Figure 2 , Figure 21 is a schematic diagram of a dual-stator excitation magnetic field modulation motor control system provided by an embodiment of the present invention, the system comprising:

[0096] The first module 210 is used to obtain a current control function, which is obtained by converting the motor thermal load formula and the motor electromagnetic torque formula, and aims to minimize the motor thermal load during the conversion process. The current control function mainly represents the relationship between the motor electromagnetic torque, the motor outer stator phase current, and the motor inner stator phase current;

[0097] The second module 220 is configured to obtain a current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and determine a target outer stator phase current and a target inner stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function;

[0098] The third module 230 is used to adjust the operating state of the dual-stator excitation magnetic field modulation motor according to the target outer stator phase current, the target inner stator phase current and the preset maximum phase current of the motor.

[0099] The contents of the above method embodiments are all applicable to the present system embodiments. The functions implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are the same as those of the above method embodiments, which will not be repeated here.

[0100] In addition, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a dual-stator excitation magnetic field modulation motor control method according to the above embodiment is implemented. The computer-readable storage medium includes, but is not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic cards, or optical cards. In other words, a storage device includes any medium that can be used by a device (such as a computer, mobile phone, etc.) to store or transmit information in a readable form, and can be a read-only memory, a disk, or an optical disk.

[0101] also, Figure 33 is a schematic diagram of the hardware structure of a computer device provided in an embodiment of the present invention, wherein the computer device includes a processor 320, a memory 330, an input unit 340, a display unit 350 and other components. It can be understood by those skilled in the art that Figure 3 The device structure components shown do not constitute a limitation on all devices, and may include more or fewer components than shown, or combine certain components. The memory 330 can be used to store the computer program 310 and various functional modules, and the processor 320 runs the computer program 310 stored in the memory 330, thereby executing various functional applications and data processing of the device. The memory can be an internal memory or an external memory, or include an internal memory and an external memory. The internal memory may include a read-only memory (ROM), a programmable ROM (PROM), an electrically programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a flash memory or a random access memory. The external memory may include a hard disk, a floppy disk, a USB flash drive, a magnetic tape, etc. The memory 330 disclosed in the embodiment of the present invention includes but is not limited to the above-mentioned types of memory. The memory 330 disclosed in the embodiment of the present invention is only an example and not a limitation.

[0102] The input unit 340 is used to receive input signals and keywords entered by the user. The input unit 340 may include a touch panel and other input devices. The touch panel can detect user touch operations on or near it (e.g., operations performed by a user using a finger, stylus, or any other suitable object or accessory on or near the touch panel) and drive corresponding connected devices according to pre-set programs. Other input devices may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., playback control keys, on / off keys, etc.), a trackball, a mouse, a joystick, etc. The display unit 350 can be used to display information entered by the user, information provided to the user, and various menus of the terminal device. The display unit 350 may take the form of a liquid crystal display, an organic light-emitting diode, etc. The processor 320 is the control center of the terminal device, connecting the various components of the entire device using various interfaces and circuits. It performs various functions and processes data by running or executing software programs and / or modules stored in the memory 330 and accessing data stored in the memory 330.

[0103] As an embodiment, the computer device includes a processor 320, a memory 330 and a computer program 310, wherein the computer program 310 is stored in the memory 330 and is configured to be executed by the processor 320, and the computer program 310 is configured to execute a dual-stator excitation magnetic field modulation motor control method in the above embodiment.

[0104] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0105] The terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatuses.

[0106] In the present application, it should be understood that "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0107] Although the description of the present application has been quite detailed and specifically describes several embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be considered to provide a broad possible interpretation of these claims by reference to the appended claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseen by the inventors, which is intended to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A dual-stator excitation magnetic field modulation motor control method, characterized in that: The method comprises: Obtaining a current control function, wherein the current control function is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula, with the goal of minimizing the motor thermal load during the conversion process, and is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current; Obtaining the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and determining the target inner stator phase current and the target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function; Adjusting the operating state of the dual-stator excitation magnetic field modulation motor according to a preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current; The current control function is obtained in the following way: Obtaining basic parameters of the dual-stator excitation magnetic field modulation motor, and then determining the electromagnetic torque function and thermal load function of the dual-stator excitation magnetic field modulation motor in combination with the motor electromagnetic torque formula and the motor thermal load formula; With the goal of minimizing the thermal load of the motor, the electromagnetic torque function and the thermal load function are fused and analyzed to obtain a first current function, where the first current function is used to characterize the relationship between the electromagnetic torque of the motor and the stator phase current in the motor; The electromagnetic torque function and the first current function are fused and converted to obtain a second current function, where the second current function is used to characterize the relationship between the electromagnetic torque of the motor and the external stator phase current of the motor; The first current function and the second current function constitute the current control function.

2. The dual-stator excitation magnetic field modulation motor control method according to claim 1, characterized in that: The basic parameters include first basic parameters for assisting in determining the electromagnetic torque function, wherein the first basic parameters include the number of pole pairs and the permanent magnet flux linkage.

3. The dual-stator excitation magnetic field modulation motor control method according to claim 1, characterized in that: The basic parameters include second basic parameters for assisting in determining the thermal load function, wherein the second basic parameters include the number of slots, the number of parallel branches, the inner diameter of the outer stator, the inner diameter of the inner stator, the cross-sectional area of ​​one turn of coil in the outer stator winding, and the cross-sectional area of ​​one turn of coil in the inner stator winding.

4. The dual-stator excitation magnetic field modulation motor control method according to claim 1, characterized in that: The goal of achieving a minimum thermal load on the motor is to fuse and analyze the electromagnetic torque function and the thermal load function to obtain a first current function, which includes: The electromagnetic torque function and the heat load function are fused and converted to obtain a first heat load function, where the first heat load function is used to characterize the relationship between the heat load of the motor, the electromagnetic torque of the motor and the stator phase current in the motor; With the goal of minimizing the thermal load of the motor, the first thermal load function is analyzed to decompose the first current function therefrom.

5. The dual-stator excitation magnetic field modulation motor control method according to claim 1, characterized in that: The adjusting the operating state of the dual-stator excitation magnetic field modulation motor according to the preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current includes: determining an optimal inner stator phase current and an optimal outer stator phase current according to a relationship among the maximum phase current of the motor, the target inner stator phase current, and the target outer stator phase current; The dual-stator excitation magnetic field modulation motor is controlled to operate according to the optimal inner stator phase current and the optimal outer stator phase current.

6. The dual-stator excitation magnetic field modulation motor control method according to claim 5, characterized in that: Determining the optimal inner stator phase current and the optimal outer stator phase current according to the relationship among the maximum phase current of the motor, the target inner stator phase current, and the target outer stator phase current includes: Adding the target inner stator phase current and the target outer stator phase current, and determining whether the added result is less than or equal to the maximum phase current of the motor; If so, the target inner stator phase current is used as the optimal inner stator phase current, and the target outer stator phase current is used as the optimal outer stator phase current; If not, the maximum phase current of the motor is distributed according to the ratio between the target inner stator phase current and the target outer stator phase current to obtain the optimal inner stator phase current and the optimal outer stator phase current.

7. A dual-stator excitation magnetic field modulation motor control system, characterized in that: The system comprises: The first module is used to obtain a current control function. The current control function is obtained by converting the motor electromagnetic torque formula and the motor thermal load formula. During the conversion process, the motor thermal load is minimized as the goal. The current control function is used to characterize the relationship between the motor electromagnetic torque, the motor inner stator phase current, and the motor outer stator phase current. The second module is used to obtain the current electromagnetic torque of the dual-stator excitation magnetic field modulation motor, and determine the target inner stator phase current and the target outer stator phase current of the dual-stator excitation magnetic field modulation motor in combination with the current control function; A third module is configured to adjust the operating state of the dual-stator excitation magnetic field modulation motor according to a preset maximum motor phase current, the target inner stator phase current, and the target outer stator phase current; The current control function is obtained in the following way: Obtaining basic parameters of the dual-stator excitation magnetic field modulation motor, and then determining the electromagnetic torque function and thermal load function of the dual-stator excitation magnetic field modulation motor in combination with the motor electromagnetic torque formula and the motor thermal load formula; With the goal of minimizing the thermal load of the motor, the electromagnetic torque function and the thermal load function are fused and analyzed to obtain a first current function, where the first current function is used to characterize the relationship between the electromagnetic torque of the motor and the stator phase current in the motor; The electromagnetic torque function and the first current function are fused and converted to obtain a second current function, where the second current function is used to characterize the relationship between the electromagnetic torque of the motor and the external stator phase current of the motor; The first current function and the second current function constitute the current control function.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: The processor executes the computer program to implement the dual-stator excitation magnetic field modulation motor control method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the dual-stator excitation magnetic field modulation motor control method according to any one of claims 1 to 6 is implemented.

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