Motor efficiency correction calculation modeling method and device, storage medium and product

Abstract

The invention discloses a motor efficiency correction calculation modeling method and device, a storage medium and a product, and relates to the technical field of motor control. The modeling method comprises the following steps: constructing a motor efficiency correction calculation model based on a motor theoretical efficiency calculation model; obtaining the actual efficiency of the motor under different rotating speeds and torques; determining the specific value of each correction coefficient in the motor efficiency correction calculation model according to the actual efficiency of the motor under different rotating speeds and torques; and substituting the specific value of each correction coefficient into the motor efficiency correction calculation model to obtain the motor efficiency correction calculation model. The method effectively solves the problem of large error between the calculation result and the experiment result of the motor theoretical efficiency calculation model.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor control, and in particular relates to a three-phase asynchronous motor efficiency correction calculation modeling method, equipment, storage medium and product. Background Art

[0002] The motor iron loss mathematical model constructed based on the relevant parameters of the three-phase asynchronous motor is:

[0003]

[0004] Among them, P fe Represents the motor iron loss, R m Represents the stator iron loss equivalent resistance, R r represents the rotor resistance, i sq represents the q-axis component of the motor stator current, i sd Represents the d-axis component of the motor stator current, L m represents the mutual inductance between the stator and the rotor, ω r Represents the angular frequency of the rotor.

[0005] The mathematical model of motor stator copper loss constructed based on the relevant parameters of the three-phase asynchronous motor is:

[0006] P cus =R s (i sd 2 +i sq 2 )(2)

[0007] Among them, P cus Represents the motor stator copper loss, R s Indicates the stator resistance.

[0008] The mathematical model of motor rotor copper loss constructed based on the relevant parameters of the three-phase asynchronous motor is:

[0009]

[0010] Among them, P cur Indicates the motor rotor copper loss.

[0011] When the motor is running stably, the loss caused by mechanical friction can be regarded as a constant value, which will not affect the efficiency calculation and can be ignored. The total motor loss P loss The mathematical model is:

[0012]

[0013] in:

[0014]

[0015] k 2 =R s L m 2 ,

[0016] ω m =ω r n p ;

[0017] Among them, n p Represents the number of motor pole pairs, ω m represents the angular velocity of the motor, T e represents the torque of the motor, ψ rd It represents the magnetic flux component of the rotor on the d-axis of the motor.

[0018] The theoretical efficiency calculation model of three-phase asynchronous motor is:

[0019]

[0020] Among them, η m It represents the theoretical efficiency of the three-phase asynchronous motor, n represents the speed of the three-phase asynchronous motor, A=T e , C=T e (1+k 4 ),

[0021] In order to verify the calculation error of the theoretical efficiency calculation model of the three-phase asynchronous motor, 12 measured efficiencies were collected experimentally to calculate the absolute error of the theoretical efficiency, as shown in Table 1. As can be seen from Table 1, the maximum absolute error of the theoretical efficiency of the three-phase asynchronous motor is 37.2%, and the average absolute error is 13.98%.

[0022] The reason why the theoretical efficiency calculation model of three-phase asynchronous motor has a large error is that the theoretical efficiency calculation model ignores various losses in actual operation, such as magnetic saturation effect, fan cooling loss and the impact of load change on efficiency. In addition, the starting process of the motor and the efficiency change under different loads are also difficult to be accurately reflected, resulting in a deviation between the theoretical efficiency (i.e., the efficiency calculated by formula (5)) and the actual efficiency (i.e., the efficiency obtained by experimental measurement).

[0023] Table 1 Comparison between measured efficiency and theoretical efficiency of three-phase asynchronous motor

[0024] Summary of the invention

[0025] The purpose of the present invention is to provide a motor efficiency correction calculation modeling method, device, storage medium and product to solve the problem of large calculation error of the existing motor theoretical efficiency calculation model.

[0026] The present invention solves the above technical problems through the following technical solutions: a motor efficiency correction calculation modeling method, comprising:

[0027] Based on the theoretical efficiency calculation model of the motor, a motor efficiency correction calculation model is constructed;

[0028] Get the actual efficiency of the motor at different speeds and torques;

[0029] Determine the specific value of each correction coefficient in the motor efficiency correction calculation model according to the actual efficiency of the motor at different speeds and torques;

[0030] Substitute the specific value of each correction coefficient into the motor efficiency correction calculation model to obtain the motor efficiency correction calculation model.

[0031] Furthermore, the specific expression of the motor efficiency correction calculation model is:

[0032]

[0033] k 2 =R s L m 2 ,

[0034]

[0035] in, Indicates the motor corrected efficiency, T e represents the motor torque, n represents the motor speed, ψ rd Represents the magnetic flux component of the rotor on the d-axis of the motor, λ 1 , 2 , 3 , 4 Both represent correction coefficients, R s Represents the stator resistance of the motor, R m Represents the stator iron loss equivalent resistance, R r Indicates the rotor resistance, n p Indicates the number of pole pairs of the motor, L m Represents the mutual inductance between the stator and the rotor.

[0036] Furthermore, the correction coefficient λ 1 The specific value is 52.9557, the correction coefficient λ 2 The specific value is 0.0408, the correction coefficient λ 3The specific value is 1.0637, the correction coefficient λ 4 The specific value is 0.0174.

[0037] Based on the same concept, the present invention also provides a motor efficiency correction calculation method, comprising:

[0038] Calling a motor efficiency correction calculation model; wherein the motor efficiency correction calculation model is constructed using the motor efficiency correction calculation modeling method as described above;

[0039] Get the torque and speed of the motor;

[0040] The motor corrected efficiency is calculated according to the motor efficiency correction calculation model and the torque and rotation speed of the motor.

[0041] Based on the same concept, the present invention also provides an electronic device, including a memory, a processor and a computer program / instructions stored in the memory, wherein the processor executes the computer program / instructions to implement the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method as described above.

[0042] Based on the same concept, the present invention also provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method as described above.

[0043] Based on the same concept, the present invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method as described above.

[0044] Beneficial Effects

[0045] Compared with the prior art, the advantages of the present invention are:

[0046] The present invention corrects the motor theoretical efficiency calculation model through a correction coefficient, greatly improves the motor efficiency calculation accuracy, and effectively solves the problem of large calculation error of the motor theoretical efficiency calculation model. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a flow chart of the motor efficiency correction calculation modeling method in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0051] Embodiment 1

[0052] In order to solve the problem of large calculation error in the existing motor theoretical efficiency calculation model, the present invention provides a motor efficiency correction calculation modeling method. Figure 1 The flow chart of the motor efficiency correction calculation modeling method provided by the present invention is shown. Figure 1 As shown, the modeling method includes the following steps:

[0053] Step A1: Based on the motor theoretical efficiency calculation model, a motor efficiency correction calculation model is constructed.

[0054] In order to improve the calculation accuracy of the three-phase asynchronous motor efficiency, the present invention modifies the existing motor theoretical efficiency calculation model (i.e., formula (5)). In a specific embodiment of the present invention, the correction is achieved by adding a correction coefficient to each item in the denominator of the motor theoretical efficiency calculation model. The specific expression of the motor efficiency correction calculation model is:

[0055]

[0056] k 2 =R s L m 2 (8)

[0057]

[0058] in, Indicates the motor corrected efficiency, T e represents the motor torque, n represents the motor speed, ψ rd Represents the magnetic flux component of the rotor on the d-axis of the motor, λ 1 , 2 , 3 , 4 Both represent correction coefficients, R s Represents the stator resistance of the motor, Rm Represents the stator iron loss equivalent resistance, R r Indicates the rotor resistance, n p Indicates the number of pole pairs of the motor, L m Represents the mutual inductance between the stator and the rotor.

[0059] In another specific implementation of the present invention, the correction can also be achieved by adding a correction coefficient to some items in the denominator of the motor theoretical efficiency calculation model. The specific expression of the motor efficiency correction calculation model is:

[0060]

[0061] Step A2: Obtain the actual efficiency of the motor at different speeds and torques.

[0062] The measured efficiency (ie, efficiency measurement value) of the motor at different speeds and torques is obtained through experiments, and the measured efficiency is taken as the actual efficiency.

[0063] Step A3: Determine specific values ​​of each correction coefficient in the motor efficiency correction calculation model according to the actual efficiency of the motor at different speeds and torques.

[0064] Substitute the actual efficiency of the motor at different speeds and torques into the motor efficiency correction calculation model to solve the correction coefficients λ in the motor efficiency correction calculation model 1 , 2 , 3 , 4 In this embodiment, the correction coefficient λ 1 The specific value is 52.9557, and the correction coefficient λ 2 The specific value is 0.0408, and the correction coefficient λ 3 The specific value is 1.0637, the correction coefficient λ 4 The specific value is 0.0174.

[0065] Step A4: Substitute the specific value of each correction coefficient into the motor efficiency correction calculation model (ie, formula (6) to formula (10)) to obtain the motor efficiency correction calculation model.

[0066] In order to verify the correctness of the motor efficiency correction calculation model of the present invention, 12 measured efficiencies were collected through experiments, and the corresponding corrected efficiencies and their absolute errors were calculated according to formulas (6) to (10), as shown in Table 2. As can be seen from Table 2, the maximum absolute error of the motor corrected efficiency is only 1.3%, and the average absolute error is 0.53%. Compared with the motor theoretical efficiency calculation model, the average absolute error is reduced by 13.45%, which greatly improves the calculation accuracy of the motor efficiency.

[0067] Table 2 Comparison of motor measured efficiency and corrected efficiency

[0068]

[0069] Embodiment 2

[0070] The motor efficiency correction calculation method provided by the embodiment of the present invention comprises the following steps:

[0071] Step B1: Calling the motor efficiency correction calculation model.

[0072] Among them, the motor efficiency correction calculation model is constructed using the motor efficiency correction calculation modeling method of Example 1 of the present application.

[0073] Step B2: Get the motor torque T e and speed n.

[0074] Step B3: Correct the calculation model (i.e., formula (6) to formula (10)) according to the motor efficiency and the motor torque T e and speed n, calculate the motor corrected efficiency

[0075] Embodiment 3

[0076] An embodiment of the present invention also provides an electronic device, which includes: a memory, a processor and a computer program / instructions stored in the memory, and the processor executes the computer program / instructions to implement the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method in the embodiment of the present application.

[0077] Although not shown, the electronic device includes a processor, which can perform various appropriate operations and processes according to the program and / or data stored in the read-only memory (ROM) or the program and / or data loaded from the storage portion into the random access memory (RAM). The processor can be a multi-core processor, or it can include multiple processors. In some embodiments, the processor can include a general main processor and one or more special coprocessors, such as a central processing unit, a graphics processing unit (GPU), a neural network processor (NPU), a digital signal processor (DSP), etc. In RAM, various programs and data required for device operation are also stored. The processor, ROM and RAM are connected to each other via a bus. The input / output (I / O) interface is also connected to the bus.

[0078] The processor and memory are used together to execute the program / instructions stored in the memory. When the program / instructions are executed by the computer, the methods, steps or functions described in the above embodiments can be implemented.

[0079] Although not shown, an embodiment of the present invention further provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method in the embodiment of the present application.

[0080] Readable storage media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0081] Although not shown, an embodiment of the present invention further provides a computer program product, including: a computer program / instruction, which, when executed by a processor, implements the motor efficiency correction calculation modeling method or the motor efficiency correction calculation method in the embodiment of the present application.

[0082] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A motor efficiency correction calculation modeling method, characterized in that: The modeling method comprises: Based on the theoretical efficiency calculation model of the motor, a motor efficiency correction calculation model is constructed; Get the actual efficiency of the motor at different speeds and torques; Determine the specific value of each correction coefficient in the motor efficiency correction calculation model according to the actual efficiency of the motor at different speeds and torques; Substitute the specific value of each correction coefficient into the motor efficiency correction calculation model to obtain the motor efficiency correction calculation model.

2. The motor efficiency correction calculation modeling method according to claim 1 is characterized in that: The specific expression of the motor efficiency correction calculation model is: in, Indicates the motor corrected efficiency, T e represents the motor torque, n represents the motor speed, ψ rd It represents the magnetic flux component of the rotor on the d-axis of the motor. λ1, λ2, λ3, and λ4 are all correction coefficients. R s Represents the stator resistance of the motor, R m Represents the stator iron loss equivalent resistance, R r Indicates the rotor resistance, n p Indicates the number of pole pairs of the motor, L m Represents the mutual inductance between the stator and the rotor.

3. The motor efficiency correction calculation modeling method according to claim 2 is characterized in that: The specific value of the correction coefficient λ1 is 52.9557, the specific value of the correction coefficient λ2 is 0.0408, the specific value of the correction coefficient λ3 is 1.0637, and the specific value of the correction coefficient λ4 is 0.0174.

4. A motor efficiency correction calculation method, characterized in that: The calculation method includes: Calling a motor efficiency correction calculation model; wherein the motor efficiency correction calculation model is constructed using the motor efficiency correction calculation modeling method according to any one of claims 1 to 3; Get the torque and speed of the motor; The motor corrected efficiency is calculated according to the motor efficiency correction calculation model and the torque and rotation speed of the motor.

5. An electronic device comprising a memory, a processor, and a computer program / instruction stored in the memory, characterized in that: The processor executes the computer program / instructions to implement the motor efficiency correction calculation modeling method according to any one of claims 1 to 3 or the motor efficiency correction calculation method according to claim 4.

6. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the motor efficiency correction calculation modeling method according to any one of claims 1 to 3 or the motor efficiency correction calculation method according to claim 4 is implemented.

7. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the motor efficiency correction calculation modeling method according to any one of claims 1 to 3 or the motor efficiency correction calculation method according to claim 4 is implemented.

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