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Volume 46,Issue 5,2019 Table of Contents
2019, 46(5):1-10.
Abstract:
Permanent magnet of permanent magnet synchronous motor was limited by the thermal constraints and could not operate in high temperature environment. Therefore, it was necessary to reduce the eddy current loss on permanent magnet so as to lower the temperature on permanent magnet. In view of the long calculation time of the eddy current loss estimation of permanent magnets by finite element method (FEM) and the difficulty of achieving the same accuracy as the FEM when using the analytical method, the hybrid analyticalFEM to estimate the eddy current loss of permanent magnets was adopted, and the reaction field of eddy current was taken into account. When simulating the rotation of motors, there was no need to repeat the triangle mesh division. By using MATLAB software, the hybrid analyticalFEM was compared with the Galerkin FEM, which reduced the number of triangles. The characteristic of the end effect and the skin effect of the eddy current losses on the permanent magnet were validated. The hybrid analyticalFEM could ensure the accuracy and reduce the simulation time.
Permanent magnet of permanent magnet synchronous motor was limited by the thermal constraints and could not operate in high temperature environment. Therefore, it was necessary to reduce the eddy current loss on permanent magnet so as to lower the temperature on permanent magnet. In view of the long calculation time of the eddy current loss estimation of permanent magnets by finite element method (FEM) and the difficulty of achieving the same accuracy as the FEM when using the analytical method, the hybrid analyticalFEM to estimate the eddy current loss of permanent magnets was adopted, and the reaction field of eddy current was taken into account. When simulating the rotation of motors, there was no need to repeat the triangle mesh division. By using MATLAB software, the hybrid analyticalFEM was compared with the Galerkin FEM, which reduced the number of triangles. The characteristic of the end effect and the skin effect of the eddy current losses on the permanent magnet were validated. The hybrid analyticalFEM could ensure the accuracy and reduce the simulation time.
2019, 46(5):11-16.
Abstract:
An analytical method of calculating the radial airgap flux density and electromagnetic force wave based on waveform reconstruction method was proposed, which simplified the calculation process of electromagnetic vibration and noise (EVAN) of permanent magnet motor and solved the complex problem of calculating the radial electromagnetic force wave of permanent magnet motor. Firstly, the theoretical basis of waveform reconstruction method to calculate EVAN of permanent magnet motor was introduced. Then, taking a permanent magnet motor as an example, the steps of calculating the EVAN of permanent magnet motor using waveform reconstruction method were introduced in detail. Finally, the multiphysical field finite element simulation of EVAN of the permanent magnet motor was carried out, and the calculation results of waveform reconstruction method were compared with those of finite element simulation results. Within the allowable range of error, the calculation results of the two methods were consistent, which verified the accuracy of waveform reconstruction method in calculating the EVAN of permanent magnet motor.
An analytical method of calculating the radial airgap flux density and electromagnetic force wave based on waveform reconstruction method was proposed, which simplified the calculation process of electromagnetic vibration and noise (EVAN) of permanent magnet motor and solved the complex problem of calculating the radial electromagnetic force wave of permanent magnet motor. Firstly, the theoretical basis of waveform reconstruction method to calculate EVAN of permanent magnet motor was introduced. Then, taking a permanent magnet motor as an example, the steps of calculating the EVAN of permanent magnet motor using waveform reconstruction method were introduced in detail. Finally, the multiphysical field finite element simulation of EVAN of the permanent magnet motor was carried out, and the calculation results of waveform reconstruction method were compared with those of finite element simulation results. Within the allowable range of error, the calculation results of the two methods were consistent, which verified the accuracy of waveform reconstruction method in calculating the EVAN of permanent magnet motor.
2019, 46(5):17-24.
Abstract:
A fieldcircuit combined electromagnetic design method for permanent magnet synchronous motor (PMSM) based on ANSYS Maxwell 2D software was presented. Through the analysis and calculation by ANSYS Maxwell 2D software, noload excitation electromotive force (EMF), excitation EMF under load, and daxis and qaxis synchronous reactance of ideal 2D model of PMSM were obtained. These parameters were used to correct the correction coefficients in the electromagnetic design program based on circuit method. The correction coefficients related to noload excitation EMF, excitation EMF under load, and daxis and qaxis synchronous reactance made the design results of PMSM more accurate. The correctness of this design method was verified by test results of a newly designed PMSM.
A fieldcircuit combined electromagnetic design method for permanent magnet synchronous motor (PMSM) based on ANSYS Maxwell 2D software was presented. Through the analysis and calculation by ANSYS Maxwell 2D software, noload excitation electromotive force (EMF), excitation EMF under load, and daxis and qaxis synchronous reactance of ideal 2D model of PMSM were obtained. These parameters were used to correct the correction coefficients in the electromagnetic design program based on circuit method. The correction coefficients related to noload excitation EMF, excitation EMF under load, and daxis and qaxis synchronous reactance made the design results of PMSM more accurate. The correctness of this design method was verified by test results of a newly designed PMSM.
2019, 46(5):25-29, 57.
Abstract:
Based on the definitions of various steadystate and transient reactance parameters of synchronous motor, as well as the electromagnetic relationship between various reactance parameters and the windings, the magnetic circuit structure of the motor, a simulation calculation method based on the definition formulas of reactance parameters was proposed. The detailed simulation calculation steps were given. By comparing the calculated results with the measured results of the prototype, it was shown that the simulation results were in good agreement with the measured values, thus the validity and accuracy of the calculation method were verified.
Based on the definitions of various steadystate and transient reactance parameters of synchronous motor, as well as the electromagnetic relationship between various reactance parameters and the windings, the magnetic circuit structure of the motor, a simulation calculation method based on the definition formulas of reactance parameters was proposed. The detailed simulation calculation steps were given. By comparing the calculated results with the measured results of the prototype, it was shown that the simulation results were in good agreement with the measured values, thus the validity and accuracy of the calculation method were verified.
2019, 46(5):30-35, 63.
Abstract:
In view of the insufficient design method for rotor bars of cage rotor brushless doublyfed motor, the analytical expression for the rotor current calculation of cage rotor brushless doublyfed motors in steady state was derived starting from analyzing the internal magnetic field of cage rotor brushless doublyfed motor. The iterative method was used to select the most suitable crosssectional area of the rotor bar in consideration of the rotor resistance, which provided a theoretical basis for the rotor design of the cage rotor brushless doublyfed machine. Via finite element simulation, the theoretical derivation was validated. The research results not only help to quickly calculate the rotor current of cage rotor brushless doublyfed motor during design, but also help to optimize the rotor structure design.
In view of the insufficient design method for rotor bars of cage rotor brushless doublyfed motor, the analytical expression for the rotor current calculation of cage rotor brushless doublyfed motors in steady state was derived starting from analyzing the internal magnetic field of cage rotor brushless doublyfed motor. The iterative method was used to select the most suitable crosssectional area of the rotor bar in consideration of the rotor resistance, which provided a theoretical basis for the rotor design of the cage rotor brushless doublyfed machine. Via finite element simulation, the theoretical derivation was validated. The research results not only help to quickly calculate the rotor current of cage rotor brushless doublyfed motor during design, but also help to optimize the rotor structure design.
2019, 46(5):36-40, 71.
Abstract:
Finite element simulation was adopted to analyze the radial air gap flux density and the radial electromagnetic exciting force wave of a 16slot 96pole surface mounted permanent magnet synchronous motor (PMSM) under the straight and skewed slots couditions. The noload vibration of these two structures was simulated through coupled harmonic response analysis. The accuracy correctness of the simulation was proved by experiment. The expecnnest result showed that the noload vibration frequency matched the frequency of the force wave. The amplitude of the loworder force wave especially whose order equalled the slot number could be effectively reduced by using skewed slots, and the vibration of the PMSM was effectively reduced as well.
Finite element simulation was adopted to analyze the radial air gap flux density and the radial electromagnetic exciting force wave of a 16slot 96pole surface mounted permanent magnet synchronous motor (PMSM) under the straight and skewed slots couditions. The noload vibration of these two structures was simulated through coupled harmonic response analysis. The accuracy correctness of the simulation was proved by experiment. The expecnnest result showed that the noload vibration frequency matched the frequency of the force wave. The amplitude of the loworder force wave especially whose order equalled the slot number could be effectively reduced by using skewed slots, and the vibration of the PMSM was effectively reduced as well.
2019, 46(5):41-46, 77.
Abstract:
The accurate identification of the equivalent circuit parameters of the asynchronous motor played an important role in motor control. At the same time, the variation of the equivalent circuit parameters could reflect the running state of the motor, so the parameter identification was also applied to the motor fault diagnosis. The modern optimization algorithm was applied to the equivalent circuit parameter identification of threephase asynchronous motor. By combining particle swarm optimization PSO algorithm with simulated annealing (SA) algorithm, six equivalent parameters of asynchronous motor could be identified accurately and effectively. Compared with genetic algorithm, the proposed algorithm was easier to implement and converged more rapidly. The algorithm was implemented by using the model in dqcoordinate system of asynchronous motor considering iron loss. Taking into account the influence of temperature on the resistance parameters, the algorithm was proved to be effective in identifying the motor parameters and tracking resistance changes through examples.
The accurate identification of the equivalent circuit parameters of the asynchronous motor played an important role in motor control. At the same time, the variation of the equivalent circuit parameters could reflect the running state of the motor, so the parameter identification was also applied to the motor fault diagnosis. The modern optimization algorithm was applied to the equivalent circuit parameter identification of threephase asynchronous motor. By combining particle swarm optimization PSO algorithm with simulated annealing (SA) algorithm, six equivalent parameters of asynchronous motor could be identified accurately and effectively. Compared with genetic algorithm, the proposed algorithm was easier to implement and converged more rapidly. The algorithm was implemented by using the model in dqcoordinate system of asynchronous motor considering iron loss. Taking into account the influence of temperature on the resistance parameters, the algorithm was proved to be effective in identifying the motor parameters and tracking resistance changes through examples.
2019, 46(5):47-50.
Abstract:
A new type of high efficiency low harmonic winding was introduced, and the characteristics of the magnetic potential harmonics of this winding were analyzed. The new high efficiency low harmonic winding motor could effectively reduce the high harmonics and improve the magnetic field distribution of motor. Through prototype manufacturing and motor testing,it was proved that the stray loss of the new high efficiency low harmonic winding motor and the temperature rise of the motor decreased significantly.
A new type of high efficiency low harmonic winding was introduced, and the characteristics of the magnetic potential harmonics of this winding were analyzed. The new high efficiency low harmonic winding motor could effectively reduce the high harmonics and improve the magnetic field distribution of motor. Through prototype manufacturing and motor testing,it was proved that the stray loss of the new high efficiency low harmonic winding motor and the temperature rise of the motor decreased significantly.
2019, 46(5):51-57.
Abstract:
Due to the nonlinearity of the inverter and the air gap magnetic field distortion of permanent magnet synchronous motor (PMSM), the stator current contains a large amount of harmonic components during the operation of the PMSM, which caused the current waveform to be distorted, resulting in a large torque ripple. The traditional harmonic suppression method used lowpass filter (LPF) to extract the 5th and 7th harmonic components, so that the dynamic response time was long and the steadystate error was large. Aiming at this problem, the closedloop current average method was proposed to extract the harmonic components. The simulation results showed that the current average method could improve the system’s rapidity and stability. Applying the closedloop current average method to the PMSM harmonic suppression system, the simulation results showed that the harmonic voltage injection method based on the closedloop current average method could reduce the distortion rate of the current waveform and the 5th and 7th harmonics content.
Due to the nonlinearity of the inverter and the air gap magnetic field distortion of permanent magnet synchronous motor (PMSM), the stator current contains a large amount of harmonic components during the operation of the PMSM, which caused the current waveform to be distorted, resulting in a large torque ripple. The traditional harmonic suppression method used lowpass filter (LPF) to extract the 5th and 7th harmonic components, so that the dynamic response time was long and the steadystate error was large. Aiming at this problem, the closedloop current average method was proposed to extract the harmonic components. The simulation results showed that the current average method could improve the system’s rapidity and stability. Applying the closedloop current average method to the PMSM harmonic suppression system, the simulation results showed that the harmonic voltage injection method based on the closedloop current average method could reduce the distortion rate of the current waveform and the 5th and 7th harmonics content.
10 Research on Speed Control of Permanent Magnet Synchronous Motor Based on New Sliding Mode Algorithm
2019, 46(5):58-63.
Abstract:
In the speed control system of permanent magnet synchronous motor (PMSM), PI controller could not meet the requirements of high precision control. A sliding mode variable structure control method based on a new reaching law is proposed. The new reaching law combined the advantages of exponential reaching law and power reaching law, and with the addition of system state variables, it could effectively suppress the chattering of sliding mode controller in the sliding stage. The constant velocity approaching term was related to the sliding surface switching function, which ensured the effective and steady approaching of the reaching law near s=0 and weakened chattering; the exponential approaching term was associated with the system state variable x1 to increase the approaching speed. The stability of the proposed method was proved by using the Lyapunov stability theory. The speed controller based on the new sliding mode algorithm was compared with the PI speed controller and the traditional sliding mode controller by simulation. The simulation results under the noload start, sudden load and variable motion conditions showed that the system using this controller could achieve rapid response, high stability and strong resistance to load disturbance.
In the speed control system of permanent magnet synchronous motor (PMSM), PI controller could not meet the requirements of high precision control. A sliding mode variable structure control method based on a new reaching law is proposed. The new reaching law combined the advantages of exponential reaching law and power reaching law, and with the addition of system state variables, it could effectively suppress the chattering of sliding mode controller in the sliding stage. The constant velocity approaching term was related to the sliding surface switching function, which ensured the effective and steady approaching of the reaching law near s=0 and weakened chattering; the exponential approaching term was associated with the system state variable x1 to increase the approaching speed. The stability of the proposed method was proved by using the Lyapunov stability theory. The speed controller based on the new sliding mode algorithm was compared with the PI speed controller and the traditional sliding mode controller by simulation. The simulation results under the noload start, sudden load and variable motion conditions showed that the system using this controller could achieve rapid response, high stability and strong resistance to load disturbance.
2019, 46(5):64-71.
Abstract:
Different current control methods were adopted in motor control according to different occasion requirements. Four main current control methods of permanent magnet synchronous motor were analyzed and their characteristics were summarized. The changes of daxis and qaxis current, stator current and power factor were analyzed when the torque was the same for the maximum torque per ampere (MTPA) control, zero daxis current (id=0) control, unity power factor (cosφ=1) control and constant flux linkage control. Four simulation models were built in MATLAB/Simulink software corresponding to different control methods. The simulation results of four current control methods showed that the stator currents from high to low were those of cosφ=1 control, constant flux linkage control, id=0control, MTPA control; the power factors from high to low were those of cosφ=1 control, constant flux linkage control, MTPA control, id=0 control. Finally, the changes of current and power factor of four control methods were compared and analyzed when salient coefficient was different.
Different current control methods were adopted in motor control according to different occasion requirements. Four main current control methods of permanent magnet synchronous motor were analyzed and their characteristics were summarized. The changes of daxis and qaxis current, stator current and power factor were analyzed when the torque was the same for the maximum torque per ampere (MTPA) control, zero daxis current (id=0) control, unity power factor (cosφ=1) control and constant flux linkage control. Four simulation models were built in MATLAB/Simulink software corresponding to different control methods. The simulation results of four current control methods showed that the stator currents from high to low were those of cosφ=1 control, constant flux linkage control, id=0control, MTPA control; the power factors from high to low were those of cosφ=1 control, constant flux linkage control, MTPA control, id=0 control. Finally, the changes of current and power factor of four control methods were compared and analyzed when salient coefficient was different.
2019, 46(5):72-77.
Abstract:
Based on the twoinertia characteristic of permanent magnet synchronous motor, the tuning of PID control parameters of motor speed loop was studied. The tuning rule of PID control parameters that made the system satisfy the evaluation criteria was studied when the natural frequency was 100 rad/s. To simplify the process, multiple variables were handled to three variables, frequency ratio x2, mass ratio x1, damping ratio x3. The fitting formula based on simulation data points was also given. Finally, the validity of the formula in shortening the time of parameter adjustment was verified by MATLAB.
Based on the twoinertia characteristic of permanent magnet synchronous motor, the tuning of PID control parameters of motor speed loop was studied. The tuning rule of PID control parameters that made the system satisfy the evaluation criteria was studied when the natural frequency was 100 rad/s. To simplify the process, multiple variables were handled to three variables, frequency ratio x2, mass ratio x1, damping ratio x3. The fitting formula based on simulation data points was also given. Finally, the validity of the formula in shortening the time of parameter adjustment was verified by MATLAB.
2019, 46(5):78-82, 88.
Abstract:
In order to solve the problem of uncertain internal parameters and unknown external disturbances of permanent magnet synchronous motor (PMSM), a nonlinear control method based on nonlinear smooth extended state observer (ESO) was proposed. By introducing the non linear smooth function, the ESO was designed to observe the internal and external uncertainties of PMSM. The observational results were compensated to the non linear controller in real time, which improved the dynamic and static performance and antidisturbance ability of the motor effectively. Sliding mode controller based on non linear smooth function was used to replace the hysteresis controller in traditional direct torque control (DTC), which effectively weakened the chattering and pulsation of the torque and flux linkage. The simulation results showed that the method has fast response, good stability, strong antidisturbance ability, and good robustness.
In order to solve the problem of uncertain internal parameters and unknown external disturbances of permanent magnet synchronous motor (PMSM), a nonlinear control method based on nonlinear smooth extended state observer (ESO) was proposed. By introducing the non linear smooth function, the ESO was designed to observe the internal and external uncertainties of PMSM. The observational results were compensated to the non linear controller in real time, which improved the dynamic and static performance and antidisturbance ability of the motor effectively. Sliding mode controller based on non linear smooth function was used to replace the hysteresis controller in traditional direct torque control (DTC), which effectively weakened the chattering and pulsation of the torque and flux linkage. The simulation results showed that the method has fast response, good stability, strong antidisturbance ability, and good robustness.
2019, 46(5):83-88.
Abstract:
An electric propulsion system of electric aircraft driven by highefficiency permanent magnet synchronous motor was equipped with a vector controller. Aircrafts are vulnerable to gust encounters, which can lead aircrafts to an unstable state. The aircraft aerodynamic model during cruise under gust and the dynamic model of the electric propulsion system of the electric aircraft were established and solved, and the setting method of PI control parameters of the electric propulsion system under gust was given. We simulated the twoseater electric aircraft using MATLAB, and then carried out the experimental tests on the ground. The simulation and experimental results showed that when the aircraft encountered gust, the speed PI control parameters considering the gust conditions could effectively reduce the speed fluctuation range of the propeller.
An electric propulsion system of electric aircraft driven by highefficiency permanent magnet synchronous motor was equipped with a vector controller. Aircrafts are vulnerable to gust encounters, which can lead aircrafts to an unstable state. The aircraft aerodynamic model during cruise under gust and the dynamic model of the electric propulsion system of the electric aircraft were established and solved, and the setting method of PI control parameters of the electric propulsion system under gust was given. We simulated the twoseater electric aircraft using MATLAB, and then carried out the experimental tests on the ground. The simulation and experimental results showed that when the aircraft encountered gust, the speed PI control parameters considering the gust conditions could effectively reduce the speed fluctuation range of the propeller.
15 Compensation Method for DeadTime Effect of Dual TwoLevelInverters in OpenEnd Winding Motor Drives
2019, 46(5):89-94.
Abstract:
Different from the deadtime effect of conventional twolevel inverters, zerosequence voltage and current could be produced by the switching dead time of dual inverters in openend winding motor drives, and consequently low frequency harmonics emerged in winding currents which led to negative effects on performance of the drive systems. A compensation scheme for the zerosequence voltage produced by the switching dead time was proposed. By inserting compensation voltage vectors, the method counteracted the zerosequence voltage produced by the switching dead time using that of the compensation voltage vectors. Therefore, the zerosequence voltage and current of the system could be reduced. The proposed compensation strategy was validated by the simulation and experiments in an openend winding induction motor drive system.
Different from the deadtime effect of conventional twolevel inverters, zerosequence voltage and current could be produced by the switching dead time of dual inverters in openend winding motor drives, and consequently low frequency harmonics emerged in winding currents which led to negative effects on performance of the drive systems. A compensation scheme for the zerosequence voltage produced by the switching dead time was proposed. By inserting compensation voltage vectors, the method counteracted the zerosequence voltage produced by the switching dead time using that of the compensation voltage vectors. Therefore, the zerosequence voltage and current of the system could be reduced. The proposed compensation strategy was validated by the simulation and experiments in an openend winding induction motor drive system.
2019, 46(5):95-99.
Abstract:
An excitation regulator capable of pulsed operation mode was developed using LabVIEW graphical programming language and NI CompactRIO. The excitation regulator including industnal PC as host computer and embedded system as slave computer was able to monitor and control the system working state during discharging in real time. The digital incremental PID algorithm was used to feedback control the toroidal field current with a control period of 1 ms. Actual operation results showed that the regulator had the advantages of high control precision, stability and reliability.
An excitation regulator capable of pulsed operation mode was developed using LabVIEW graphical programming language and NI CompactRIO. The excitation regulator including industnal PC as host computer and embedded system as slave computer was able to monitor and control the system working state during discharging in real time. The digital incremental PID algorithm was used to feedback control the toroidal field current with a control period of 1 ms. Actual operation results showed that the regulator had the advantages of high control precision, stability and reliability.
2019, 46(5):100-106, 119.
Abstract:
In order to accelerate the practical application of the all silicon carbide power module, the switching process of the all silicon carbide power module was analyzed. Parameters including voltage and current change rates, grid voltage coupling and switching loss were investigated. Besides, the IGBT module and the all silicon carbide power module were compared. On the basis of the doublepulse test of the all silicon carbide power module, the switching transient characteristics and the switching loss under different voltage and current levels were studied. The voltage and current stress values were obtained by extracting the test parameters. The results provided effective reference for the practical application of the all silicon carbide power module.
In order to accelerate the practical application of the all silicon carbide power module, the switching process of the all silicon carbide power module was analyzed. Parameters including voltage and current change rates, grid voltage coupling and switching loss were investigated. Besides, the IGBT module and the all silicon carbide power module were compared. On the basis of the doublepulse test of the all silicon carbide power module, the switching transient characteristics and the switching loss under different voltage and current levels were studied. The voltage and current stress values were obtained by extracting the test parameters. The results provided effective reference for the practical application of the all silicon carbide power module.
2019, 46(5):107-112.
Abstract:
A permanent magnet synchronous motor (PMSM) with NdFeB and ferrite hybrid permanent magnets for hybrid electric vehicle integrated starter generator (ISG) was designed. The influence of the structure parameters of the two permanent magnets on the magnetic circuit of the motor was analyzed, and the constraints of the parallel magnetic circuit of NdFeB and ferrite were deduced. With the irreversible demagnetization of ferrite and the basic performance of the motor as the optimization objective, the structure parameters of NdFeB and ferrite were determined by fieldcircuit combining method. The NdFeB PMSM was compared and analyzed in terms of motor performance and permanent magnet cost. The results showed that the ISG hybrid permanent magnet motor proposed could effectively reduce the cost of permanent magnet materials and the risk of ferrite demagnetization, and the performance of the motor met the design requirements.
A permanent magnet synchronous motor (PMSM) with NdFeB and ferrite hybrid permanent magnets for hybrid electric vehicle integrated starter generator (ISG) was designed. The influence of the structure parameters of the two permanent magnets on the magnetic circuit of the motor was analyzed, and the constraints of the parallel magnetic circuit of NdFeB and ferrite were deduced. With the irreversible demagnetization of ferrite and the basic performance of the motor as the optimization objective, the structure parameters of NdFeB and ferrite were determined by fieldcircuit combining method. The NdFeB PMSM was compared and analyzed in terms of motor performance and permanent magnet cost. The results showed that the ISG hybrid permanent magnet motor proposed could effectively reduce the cost of permanent magnet materials and the risk of ferrite demagnetization, and the performance of the motor met the design requirements.
2019, 46(5):113-119.
Abstract:
For the problems of the uncertainty of the vehicle mass and the conversion coefficient of the bus’ rotating mass, and the parameter perturbation of the motor during the regenerative braking process of the electric bus during long downhill running, the model of the electric bus regenerative braking system was constructed. The H∞ robust optimal controller was designed based on the linear matrix inequality (LMI), and simulated in MATLAB/Simulink. The simulation results showed that the H∞ robust optimal control had better robust stability than the traditional speedcurrent speedcurrent doubleclosedloop PI control, and the feedback energy was increased by 2%~3%.
For the problems of the uncertainty of the vehicle mass and the conversion coefficient of the bus’ rotating mass, and the parameter perturbation of the motor during the regenerative braking process of the electric bus during long downhill running, the model of the electric bus regenerative braking system was constructed. The H∞ robust optimal controller was designed based on the linear matrix inequality (LMI), and simulated in MATLAB/Simulink. The simulation results showed that the H∞ robust optimal control had better robust stability than the traditional speedcurrent speedcurrent doubleclosedloop PI control, and the feedback energy was increased by 2%~3%.
2019, 46(5):120-125.
Abstract:
When the negative sequence current is taken as the fault characteristic quantity of interturn faults in stator windings of asynchronous motor, its extraction is easily affected by harmonics and noises and the spectrum analysis is rather complicated, so it is difficult to balance the reliability and efficiency of fault diagnosis. In order to diagnose interturn faults in stator windings of asynchronous motor reliably and efficiently, on the basis of multiple Park’s transformations, the fault characteristic quantity Izpg was put forward to reflect the fault. The current frequency in the stator after the fault was deduced according to the motor magnetic field after the fault firstly. Then the expression of fault characteristic quantity Izpg extracted by multiple Park’s transformations was obtained under nonideal working conditions. Finally, the multiloop mathematical model of asynchronous motor after fault was established, and the interturn fault of stator with different severity under ideal and nonideal conditions was simulated. The analysis results showed that the Izpg was positively correlated with the severity of the fault and had robustness to nonideal conditions such as voltage source imbalance, and it was highly sensitive and reliable to diagnose the stator interturn fault of asynchronous motor by Izpg.
When the negative sequence current is taken as the fault characteristic quantity of interturn faults in stator windings of asynchronous motor, its extraction is easily affected by harmonics and noises and the spectrum analysis is rather complicated, so it is difficult to balance the reliability and efficiency of fault diagnosis. In order to diagnose interturn faults in stator windings of asynchronous motor reliably and efficiently, on the basis of multiple Park’s transformations, the fault characteristic quantity Izpg was put forward to reflect the fault. The current frequency in the stator after the fault was deduced according to the motor magnetic field after the fault firstly. Then the expression of fault characteristic quantity Izpg extracted by multiple Park’s transformations was obtained under nonideal working conditions. Finally, the multiloop mathematical model of asynchronous motor after fault was established, and the interturn fault of stator with different severity under ideal and nonideal conditions was simulated. The analysis results showed that the Izpg was positively correlated with the severity of the fault and had robustness to nonideal conditions such as voltage source imbalance, and it was highly sensitive and reliable to diagnose the stator interturn fault of asynchronous motor by Izpg.
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Electric Machines & Control Application ® 2025
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
