First-order thermal equivalent simulation method and device for high-power servo induction motor

Abstract

The invention relates to the technical field of thermal equivalent simulation, and particularly provides a first-order thermal equivalent simulation method and device for a high-power servo induction motor. The method comprises the following steps: constructing a first-order thermal equivalent model, and simulating the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; collecting data in temperature rise and cooling processes of the servo induction motor; calculating parameters of the first-order thermal equivalent simulation model according to the collected data; according to the method, the thermal behavior of the motor can be accurately and efficiently simulated through the first-order thermal equivalent simulation model, the problems that thermal equivalent simulation is inaccurate, the calculation amount is large and real-time application is difficult are solved, the performance and stability of a motor system are improved, and the method is suitable for popularization and application. And powerful support is provided for design, optimization and fault diagnosis of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of thermal equivalent simulation, and in particular to a first-order thermal equivalent simulation method and device for a high-power servo induction motor. Background Art

[0002] At present, the thermal equivalent simulation of high-power servo induction motors mostly uses complex thermal network models or empirical thermal calculation formulas. These methods have problems such as large amount of calculation, low simulation accuracy, and difficulty in real-time application. Specifically, the existing technology has the following problems: high complexity. The equivalent thermal network model needs to describe the heat transfer relationship between the internal components of the motor in detail, which leads to complex model construction and large amount of calculation; insufficient accuracy. Due to the significant dynamic characteristics of high-power servo induction motors, traditional equivalent thermal network models are difficult to accurately reflect the changing laws of their thermal behavior; poor real-time performance. Due to the high complexity of the model and the large amount of calculation, the efficiency and accuracy of real-time estimation of temperature rise are limited. Summary of the invention

[0003] In view of this, the present invention provides a first-order thermal equivalent simulation method and device for a high-power servo induction motor, so as to solve the problems of inaccurate thermal equivalent simulation of the high-power servo induction motor, large amount of calculation and difficulty in real-time application.

[0004] In a first aspect, the present invention provides a first-order thermal equivalent simulation method for a high-power servo induction motor, the method comprising: Step 1, construct a first-order thermal equivalent model, and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; Step 2, collecting data during the temperature rise and cooling process of the servo induction motor; Step 3: Calculate the parameters of the first-order thermal equivalent simulation model based on the collected data; Step 4: Verify the first-order thermal equivalent simulation model and evaluate the model.

[0005] Optionally, the expression for constructing the first-order thermal equivalent model in step 1 is: ; in, is the motor efficiency, is the motor power, R is the equivalent thermal resistance, C is the equivalent heat capacity, t is the time, T is the real-time temperature rise of the motor, It is a fixed value offset of time.

[0006] Optionally, the step 2 includes: On the servo drive system experimental platform, the temperature rise and cooling process of the servo induction motor at rated speed and rated torque, rated speed and 50% rated torque, 50% rated speed and 1.5 times rated torque from cold state are measured respectively; the electrical parameters and temperature parameters of the servo induction motor are recorded respectively using the towing detection station and temperature inspection instrument, including the motor efficiency , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature ,in i The values ​​of are 1, 2, and 3; n is the number of data, and data is recorded every 1 minute.

[0007] Optionally, the step 3 includes: Motor efficiency based on data collected at rated speed and rated torque , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature , calculates the parameters of the first-order thermal equivalent simulation model, including the time fixed offset , equivalent thermal resistance R, equivalent heat capacity C; Average thermal power at rated speed and rated torque , whose expression is: ; Motor temperature rise data at rated speed and rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Sampling sequence ; According to the temperature rise data and the sampling sequence , using the curve fitter in MAtlab according to the temperature rise formula , we can conclude , and time fixed offset The value of t0; Equivalent thermal resistance R= ; Equivalent heat capacity C = .

[0008] Optionally, step 4 includes: The accuracy of the first-order thermal equivalent simulation model was verified using test data under two different working conditions: rated speed and 50% rated torque, and 50% speed and 1.5 times rated torque. The accuracy and reliability of the model were evaluated by comparing the measured temperature rise data with the temperature rise data simulated by the model. Average thermal power at rated speed and 50% rated torque , whose expression is: ; Average thermal power at 50% speed and 1.5 times rated torque , whose expression is: ; Motor temperature rise data at rated speed and 50% rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Motor temperature rise data at 50% speed and 1.5 times rated torque , whose expression is: ; Thermal equivalent simulation of motor temperature rise data under rated speed and 50% rated torque conditions , whose expression is: ; Thermal equivalent simulation of motor temperature rise under 50% speed and 1.5 times rated torque conditions , whose expression is: ; By comparing the measured temperature rise data with the temperature rise data simulated by the model, the accuracy and reliability of the thermal equivalent model were verified.

[0009] In a second aspect, the present invention provides a first-order thermal equivalent simulation device for a high-power servo induction motor, the device comprising: A model building module, used to build a first-order thermal equivalent model and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; A data acquisition module for collecting data during the temperature rise and cooling process of the servo induction motor; A model calculation module is used to calculate the parameters of the first-order thermal equivalent simulation model based on the collected data; Model verification module, used to verify the first-order thermal equivalent simulation model; Load characteristic curve drawing module for evaluating models.

[0010] In the technical solution provided by the present invention, the method includes constructing a first-order thermal equivalent model, and simulating the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; collecting data in the temperature rise and cooling process of the servo induction motor; calculating the parameters of the first-order thermal equivalent simulation model based on the collected data; verifying the first-order thermal equivalent simulation model and evaluating the model. The method can accurately and efficiently simulate the thermal behavior of the motor through the first-order thermal equivalent simulation model, solves the problems of inaccurate thermal equivalent simulation, large amount of calculation and difficulty in real-time application, improves the performance and stability of the motor system, and provides strong support for the design, optimization and fault diagnosis of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A flow chart of a first-order thermal equivalent simulation method provided by an embodiment of the present invention; Figure 2 A schematic diagram of a first-order thermal equivalent model provided by an embodiment of the present invention; Figure 3 A temperature rise curve diagram of a first-order thermal equivalent model provided by an embodiment of the present invention; Figure 4 A temperature rise curve diagram of the actual temperature rise and the thermal equivalent simulation under the rated speed and rated torque conditions provided by the embodiment of the present invention; Figure 5 A temperature rise curve diagram of the actual temperature rise and thermal equivalent simulation under the rated speed and 50% rated torque working conditions provided by the embodiment of the present invention; Figure 6 The actual temperature rise and thermal equivalent simulated temperature rise curves under the working conditions of 50% speed and 1.5 times rated torque provided by the embodiment of the present invention; Figure 7 A schematic diagram of a first-order thermal equivalent simulation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0014] It should be clear that 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.

[0015] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0016] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0017] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0018] Figure 1 A flow chart of a first-order thermal equivalent simulation method provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes: Step 1: Construct a first-order thermal equivalent model and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model.

[0019] In the embodiment of the present invention, Figure 2 As shown, the expression for constructing the first-order thermal equivalent model in step 1 is: ; in, is the motor efficiency, is the motor power, R is the equivalent thermal resistance, C is the equivalent heat capacity, t is the time, T is the real-time temperature rise of the motor, It is a fixed value offset of time.

[0020] Step 2: Collect data on the temperature rise and cooling process of the servo induction motor.

[0021] In the embodiment of the present invention, Figure 3 As shown, step 2 includes: On the servo drive system experimental platform, the temperature rise and cooling process of the servo induction motor at rated speed and rated torque, rated speed and 50% rated torque, 50% rated speed and 1.5 times rated torque from cold state are measured respectively; the electrical parameters and temperature parameters of the servo induction motor are recorded respectively using the towing detection station and temperature inspection instrument, including the motor efficiency , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature ,in i The values ​​of are 1, 2, and 3; n is the number of data, and the data is recorded every 1 minute. In the embodiment of the present invention, the motor efficiency includes ; Output power includes ;U phase current includes ; Speed ​​includes ; Torque includes ;U phase winding temperature includes ; Ambient temperature includes .

[0022] Step 3: Calculate the parameters of the first-order thermal equivalent simulation model based on the collected data.

[0023] In the embodiment of the present invention, step 3 includes: Motor efficiency based on data collected at rated speed and rated torque , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature , calculates the parameters of the first-order thermal equivalent simulation model, including the time fixed offset , equivalent thermal resistance R, equivalent heat capacity C; Average thermal power at rated speed and rated torque , whose expression is: ; Motor temperature rise data at rated speed and rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Sampling sequence ; According to the temperature rise data and the sampling sequence , using the curve fitter in MAtlab according to the temperature rise formula , we can conclude , and time fixed offset The value of t0; Equivalent thermal resistance R= ; Equivalent heat capacity C = .

[0024] Step 4: Verify the first-order thermal equivalent simulation model and evaluate the model.

[0025] In the embodiment of the present invention, Figures 4 to 6 As shown, step 4 includes: The accuracy of the first-order thermal equivalent simulation model was verified using test data under two different working conditions: rated speed and 50% rated torque, and 50% speed and 1.5 times rated torque. The accuracy and reliability of the model were evaluated by comparing the measured temperature rise data with the temperature rise data simulated by the model. Average thermal power at rated speed and 50% rated torque , whose expression is: ; Average thermal power at 50% speed and 1.5 times rated torque , whose expression is: ; Motor temperature rise data at rated speed and 50% rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Motor temperature rise data at 50% speed and 1.5 times rated torque , whose expression is: ; Thermal equivalent simulation of motor temperature rise data under rated speed and 50% rated torque conditions , whose expression is: ; Thermal equivalent simulation of motor temperature rise under 50% speed and 1.5 times rated torque conditions , whose expression is: ; By comparing the measured temperature rise data with the temperature rise data simulated by the model, the accuracy and reliability of the thermal equivalent model were verified.

[0026] Figure 7 A schematic diagram of a first-order thermal equivalent simulation device provided by an embodiment of the present invention, such as Figure 7 As shown, the device includes: a model building module 1, a data acquisition module 2, a model calculation module 3, a model verification module 4 and a load characteristic curve drawing module 5.

[0027] The model building module 1 is connected to the data acquisition module 2; the data acquisition module 2 is connected to the model calculation module 3; the model calculation module 3 is connected to the model verification module 4; the model verification module 4 is connected to the load characteristic curve drawing module 5.

[0028] The model building module 1 is used to build a first-order thermal equivalent model, and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; the data acquisition module 2 is used to collect data in the temperature rise and cooling process of the servo induction motor; the model calculation module 3 is used to calculate the parameters of the first-order thermal equivalent simulation model according to the collected data; the model verification module 4 is used to verify the first-order thermal equivalent simulation model; the load characteristic curve drawing module 5 is used to evaluate the model.

[0029] According to the thermal equivalent model and the temperature rise of the motor, the control strategy of the motor is adjusted to achieve active thermal control and prevent the motor from overheating.

[0030] The present invention aims to achieve more accurate and efficient thermal equivalent simulation to improve the performance and stability of the motor system and provide strong support for the design, optimization and fault diagnosis of the motor. By introducing a first-order thermal equivalent simulation model and combining the electrical and thermal characteristics of the servo induction motor, the temperature rise of the motor can be simulated more accurately, effectively solving the limitations of traditional methods in high-power servo applications.

[0031] Compared with the prior art, the present invention has the following beneficial effects: (1) High accuracy: By introducing a first-order thermal equivalent simulation model and combining it with the dynamic characteristics of the servo induction motor, the present invention can more accurately simulate the thermal behavior of the motor and improve the accuracy of the simulation results.

[0032] (2) Small amount of calculation: Compared with the traditional thermal network model, the first-order thermal equivalent model has a simpler structure and fewer parameters, which significantly reduces the amount of calculation and improves the simulation efficiency. This method avoids complex numerical calculations and simulation processes, improves calculation efficiency, and reduces calculation costs.

[0033] (3) Strong real-time performance: The method of the present invention can input the dynamic characteristic parameters of the motor in real time and perform real-time simulation, providing strong support for real-time monitoring and fault diagnosis of the motor.

[0034] (4) Through this method, the load characteristic curve of the motor can be easily obtained, providing strong support for the performance and control of the motor.

[0035] In the technical solution provided by the present invention, the method includes constructing a first-order thermal equivalent model, and simulating the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; collecting data in the temperature rise and cooling process of the servo induction motor; calculating the parameters of the first-order thermal equivalent simulation model based on the collected data; verifying the first-order thermal equivalent simulation model and evaluating the model. The method can accurately and efficiently simulate the thermal behavior of the motor through the first-order thermal equivalent simulation model, solves the problems of inaccurate thermal equivalent simulation, large amount of calculation and difficulty in real-time application, improves the performance and stability of the motor system, and provides strong support for the design, optimization and fault diagnosis of the motor.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A first-order thermal equivalent simulation method for a high-power servo induction motor, characterized in that: The method comprises: Step 1, construct a first-order thermal equivalent model, and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; Step 2, collecting data during the temperature rise and cooling process of the servo induction motor; Step 3: Calculate the parameters of the first-order thermal equivalent simulation model based on the collected data; Step 4: Verify the first-order thermal equivalent simulation model and evaluate the model.

2. The method according to claim 1, characterized in that The expression for constructing the first-order thermal equivalent model in step 1 is: ； in, is the motor efficiency, is the motor power, R is the equivalent thermal resistance, C is the equivalent heat capacity, t is the time, T is the real-time temperature rise of the motor, A fixed time offset.

3. The method according to claim 1, characterized in that The step 2 comprises: On the servo drive system experimental platform, the temperature rise and cooling process of the servo induction motor at rated speed and rated torque, rated speed and 50% rated torque, 50% rated speed and 1.5 times rated torque from cold state are measured respectively; the electrical parameters and temperature parameters of the servo induction motor are recorded respectively using the towing detection station and temperature inspection instrument, including the motor efficiency , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature ,in i The values ​​of are 1, 2, and 3; n is the number of data, and data is recorded every 1 minute.

4. The method according to claim 1, characterized in that: The step 3 comprises: Motor efficiency based on data collected at rated speed and rated torque , output power , U phase current , speed , Torque , U phase winding temperature , Ambient temperature , calculates the parameters of the first-order thermal equivalent simulation model, including the time fixed offset , equivalent thermal resistance R, equivalent heat capacity C; Average thermal power at rated speed and rated torque , whose expression is: ； Motor temperature rise data at rated speed and rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Sampling sequence ; According to the temperature rise data and the sampling sequence , using the curve fitter in MAtlab according to the temperature rise formula , we can conclude , and time fixed offset The value of t0; Equivalent thermal resistance R= ; Equivalent heat capacity C = .

5. The method according to claim 1, characterized in that The step 4 comprises: The accuracy of the first-order thermal equivalent simulation model was verified using test data under two different working conditions: rated speed and 50% rated torque, and 50% speed and 1.5 times rated torque. The accuracy and reliability of the model were evaluated by comparing the measured temperature rise data with the temperature rise data simulated by the model. Average thermal power at rated speed and 50% rated torque , whose expression is: ； Average thermal power at 50% speed and 1.5 times rated torque , whose expression is: ； Motor temperature rise data at rated speed and 50% rated torque , whose expression is: , where m is 1, 2, 3, ..., n; Motor temperature rise data at 50% speed and 1.5 times rated torque , whose expression is: ； Thermal equivalent simulation of motor temperature rise data under rated speed and 50% rated torque conditions , whose expression is: ； Thermal equivalent simulation of motor temperature rise under 50% speed and 1.5 times rated torque conditions , whose expression is: ； By comparing the measured temperature rise data with the temperature rise data simulated by the model, the accuracy and reliability of the thermal equivalent model were verified.

6. A first-order thermal equivalent simulation device for a high-power servo induction motor, characterized in that: The device comprises: A model building module, used to build a first-order thermal equivalent model and simulate the temperature rise and cooling process of the servo induction motor through the first-order thermal equivalent model; A data acquisition module for collecting data during the temperature rise and cooling process of the servo induction motor; A model calculation module is used to calculate the parameters of the first-order thermal equivalent simulation model based on the collected data; Model verification module, used to verify the first-order thermal equivalent simulation model; Load characteristic curve drawing module for evaluating models.

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