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Volume 44,Issue 8,2017 Table of Contents
2017, 44(8):1-5.
Abstract:
In order to improve the control performance of position sensorless technology of permanent magnet synchronous motor (PMSM), a sliding variable structure controller mode was used to replace the traditional PI controller, and a new approach law was presented to improve the output of the sliding mode controller model, which had weakened the chattering of the traditional sliding mode control and improved the antiinterference ability of the control system. In the analysis of position sensorless technology, a highfrequency pulse current signal injected in twophase stationary coordinate system was characterized by a high signal to noise ratio owing to the introduction of a highpass resonant filter. The simulation results showed that the application of the sliding mode variable structure controller in the high frequency pulse current injection method with highpass resonant filtering improved the accuracy of the rotor position estimation and enhanced the robustness of the control system.
In order to improve the control performance of position sensorless technology of permanent magnet synchronous motor (PMSM), a sliding variable structure controller mode was used to replace the traditional PI controller, and a new approach law was presented to improve the output of the sliding mode controller model, which had weakened the chattering of the traditional sliding mode control and improved the antiinterference ability of the control system. In the analysis of position sensorless technology, a highfrequency pulse current signal injected in twophase stationary coordinate system was characterized by a high signal to noise ratio owing to the introduction of a highpass resonant filter. The simulation results showed that the application of the sliding mode variable structure controller in the high frequency pulse current injection method with highpass resonant filtering improved the accuracy of the rotor position estimation and enhanced the robustness of the control system.
2017, 44(8):6-11.
Abstract:
The coordination control method of microgrid was one of the most important technologies in microgrid, and the master slave control method was a common method in the coordinated control of microgrid. Aiming at the problems existing in the traditional master slave control, a new type of master slave control strategy with auxiliary micro source was presented. On the basis of traditional masterslave control, it added a droop control of auxiliary control unit which could be with the main control unit together to support micro network voltage and frequency stability, and could be the new main control unit when the main control unit fails. The method overcame the danger that the traditional master slave control system adopted a single main control unit , and the stability of the master slave control mode was enhanced. The effectiveness and feasibility of the proposed control strategy were verified by MATLAB/Simulink software simulation.
The coordination control method of microgrid was one of the most important technologies in microgrid, and the master slave control method was a common method in the coordinated control of microgrid. Aiming at the problems existing in the traditional master slave control, a new type of master slave control strategy with auxiliary micro source was presented. On the basis of traditional masterslave control, it added a droop control of auxiliary control unit which could be with the main control unit together to support micro network voltage and frequency stability, and could be the new main control unit when the main control unit fails. The method overcame the danger that the traditional master slave control system adopted a single main control unit , and the stability of the master slave control mode was enhanced. The effectiveness and feasibility of the proposed control strategy were verified by MATLAB/Simulink software simulation.
2017, 44(8):12-18.
Abstract:
A novel 6/13pole axial field fluxswitching permanent magnet (AFFSPM) motor with stator modules motor was proposed, which had the advantages of compact structure, high torque density, high efficiency and strong fault tolerance. The structure and working principle of AFFSPM motor were analyzed, and the mathematical model of AFFSPM motor was derived. The simulation model of control system was built by using MATLAB/Simulink simulation software. The control strategy of sliding mode speed control and proportional resonant control were investigated, respectively. The waveforms of speed, torque and threephase currents of AFFSPM motor were analyzed and compared. The simulation results showed that, the control system of the novel AFFSPM motor had better static and dynamic performance under the sliding mode speed control strategy compared to the proportional resonant control method.
A novel 6/13pole axial field fluxswitching permanent magnet (AFFSPM) motor with stator modules motor was proposed, which had the advantages of compact structure, high torque density, high efficiency and strong fault tolerance. The structure and working principle of AFFSPM motor were analyzed, and the mathematical model of AFFSPM motor was derived. The simulation model of control system was built by using MATLAB/Simulink simulation software. The control strategy of sliding mode speed control and proportional resonant control were investigated, respectively. The waveforms of speed, torque and threephase currents of AFFSPM motor were analyzed and compared. The simulation results showed that, the control system of the novel AFFSPM motor had better static and dynamic performance under the sliding mode speed control strategy compared to the proportional resonant control method.
2017, 44(8):19-25, 37.
Abstract:
Causing power imbalances within the system for the DC microgrid photovoltaic power generation unit of output volatility and intermittent, the coordinated control strategy of hybrid energy storage system based on DC bus voltage was proposed. The hybrid energy storage system could simultaneously take the advantages of high energy density and high power density. The strategy of the DC link voltage hierarchical control, using four threshold voltage was divided into five regions, with DC bus voltage as the information carrier, determined the operation state of the micro grid system, and realized the free switching between the charging and discharging modes of the hybrid energy storage unit. Hierarchical voltage control could effectively avoid the battery for the normal grid voltage fluctuations and frequent of charge discharge switch, further extending the service life of the battery. Finally, the simulation results of MATLAB/Simulink verified the feasibility of the proposed control strategy.
Causing power imbalances within the system for the DC microgrid photovoltaic power generation unit of output volatility and intermittent, the coordinated control strategy of hybrid energy storage system based on DC bus voltage was proposed. The hybrid energy storage system could simultaneously take the advantages of high energy density and high power density. The strategy of the DC link voltage hierarchical control, using four threshold voltage was divided into five regions, with DC bus voltage as the information carrier, determined the operation state of the micro grid system, and realized the free switching between the charging and discharging modes of the hybrid energy storage unit. Hierarchical voltage control could effectively avoid the battery for the normal grid voltage fluctuations and frequent of charge discharge switch, further extending the service life of the battery. Finally, the simulation results of MATLAB/Simulink verified the feasibility of the proposed control strategy.
2017, 44(8):26-31, 42.
Abstract:
An improved sliding mode observer (SMO) was designed to realize sensorless control in wide speed range of permanent magnet synchronous motor (PMSM). A back electromotive force (EMF) observer was used to replace the low pass filter, which avoided the problem of the rotor position information lag. Meanwhile, the feedback value of back EMF were introduced into the calculation of stator current and feedback coefficient according to the variation of rotating speed of the rotor was adaptively adjusted, which reduced the chattering of the system. Thus the rotor position and speed estimation was more accurate in wide speed range. The phase locked loop (PLL) technique was used to suppress the high frequency information to extract the accurate rotor position. Based on the dSPACE rapid control prototype experimental platform, the sensorless control system of static and dynamic experiments were carried out. The results verified the validity of the proposed method.
An improved sliding mode observer (SMO) was designed to realize sensorless control in wide speed range of permanent magnet synchronous motor (PMSM). A back electromotive force (EMF) observer was used to replace the low pass filter, which avoided the problem of the rotor position information lag. Meanwhile, the feedback value of back EMF were introduced into the calculation of stator current and feedback coefficient according to the variation of rotating speed of the rotor was adaptively adjusted, which reduced the chattering of the system. Thus the rotor position and speed estimation was more accurate in wide speed range. The phase locked loop (PLL) technique was used to suppress the high frequency information to extract the accurate rotor position. Based on the dSPACE rapid control prototype experimental platform, the sensorless control system of static and dynamic experiments were carried out. The results verified the validity of the proposed method.
2017, 44(8):32-37.
Abstract:
The optimal stator current control of synchronous reluctance machine (SynRM) considering magnetic saturation was proposed. With the finite method, the nonlinear relationship between current and inductance obtained, and then the optimal trajectory of stator current changing with load was got to realize maximum torque per ampere (MTPA) control; As to the coupling problem of traditional current loop, decoupling control considering magnetic saturation was proposed to improve the dynamic and static performance. Simulation and experimental results verified the effectiveness of the scheme.
The optimal stator current control of synchronous reluctance machine (SynRM) considering magnetic saturation was proposed. With the finite method, the nonlinear relationship between current and inductance obtained, and then the optimal trajectory of stator current changing with load was got to realize maximum torque per ampere (MTPA) control; As to the coupling problem of traditional current loop, decoupling control considering magnetic saturation was proposed to improve the dynamic and static performance. Simulation and experimental results verified the effectiveness of the scheme.
2017, 44(8):38-42.
Abstract:
Because of the many advantages of PMSM, a model predictive control method of PMSM based on maximum torque current ratio (MTPA) control to maximize the utilization of reluctance torque was presented. The typical problems of several optimization targets were studied in detail, including switch state constraints, MTPA optimization, maximum current limit and delay compensation strategy, using discrete digital processing techniques. The simulation results of MATLAB/Simulink showed that the control system achieved the maximum torquecurrent ratio control and the dynamic response process was very fast, and the working efficiency of the PMSM model predictive control system was improved remarkably, and the fluctuation of the motor parameter showed strong robustness.
Because of the many advantages of PMSM, a model predictive control method of PMSM based on maximum torque current ratio (MTPA) control to maximize the utilization of reluctance torque was presented. The typical problems of several optimization targets were studied in detail, including switch state constraints, MTPA optimization, maximum current limit and delay compensation strategy, using discrete digital processing techniques. The simulation results of MATLAB/Simulink showed that the control system achieved the maximum torquecurrent ratio control and the dynamic response process was very fast, and the working efficiency of the PMSM model predictive control system was improved remarkably, and the fluctuation of the motor parameter showed strong robustness.
2017, 44(8):43-47, 68.
Abstract:
In order to solve the problem of phase voltage, phase current distortion and torque ripple caused by effect of dead time in the low frequency and light load of sinusoidal pulse width modulation (SPWM) voltage source inverter. A novel selfcalibration method was proposed. The method not only considered influence of dead time, voltage drop of power device, turnon time and turnoff time on the output current of inverter. And the fluctuation of DC bus voltage and carrier frequency was calculated and online compensated. Finally, the experiments were carried out before and after compensation, the results showed that the method had better compensation effect.
In order to solve the problem of phase voltage, phase current distortion and torque ripple caused by effect of dead time in the low frequency and light load of sinusoidal pulse width modulation (SPWM) voltage source inverter. A novel selfcalibration method was proposed. The method not only considered influence of dead time, voltage drop of power device, turnon time and turnoff time on the output current of inverter. And the fluctuation of DC bus voltage and carrier frequency was calculated and online compensated. Finally, the experiments were carried out before and after compensation, the results showed that the method had better compensation effect.
2017, 44(8):48-53.
Abstract:
Due to its excellent magnetic performance, amorphous metal offers the potential of reducing the core loss of motors dramatically and improve the motor efficiency. According to the characteristics of amorphous alloy materials, based on the basic design theory of permanent magnet motor, the analytical expression of copper loss and core loss was derived. Through the expression of loss, several key design variables were emphasized: the innertoexternal diameter, the flux density, that assumed a decisive role in the permanent magnet motor. The design rules of amorphous alloy motor were summarized. On the basis of design rules, an amorphous alloy permanent magnet motor was designed and tested. The study had certain reference value for design and optimization of amorphous alloy motor.
Due to its excellent magnetic performance, amorphous metal offers the potential of reducing the core loss of motors dramatically and improve the motor efficiency. According to the characteristics of amorphous alloy materials, based on the basic design theory of permanent magnet motor, the analytical expression of copper loss and core loss was derived. Through the expression of loss, several key design variables were emphasized: the innertoexternal diameter, the flux density, that assumed a decisive role in the permanent magnet motor. The design rules of amorphous alloy motor were summarized. On the basis of design rules, an amorphous alloy permanent magnet motor was designed and tested. The study had certain reference value for design and optimization of amorphous alloy motor.
2017, 44(8):54-58.
Abstract:
The influence of the frequency for the high frequency voltage signal made on estimator was studied when the initial position was estimated with the theory of highfrequency voltage injection was employed. The theory of highfrequency voltage injection was introduced to estimate the initial rotor position of PMSM. Meet the minimum injection frequency estimation convergence was deduced. The influence of injection frequency on the estimate accuracy and speed of the rotor position observer was studied theoretically and experimentally, thereby suitable range of injection frequency was developed. Experimental results indicated that the reasonable cutoff frequency and appropriate injection frequency could effectively balance the estimating speed and precision of the estimator.
The influence of the frequency for the high frequency voltage signal made on estimator was studied when the initial position was estimated with the theory of highfrequency voltage injection was employed. The theory of highfrequency voltage injection was introduced to estimate the initial rotor position of PMSM. Meet the minimum injection frequency estimation convergence was deduced. The influence of injection frequency on the estimate accuracy and speed of the rotor position observer was studied theoretically and experimentally, thereby suitable range of injection frequency was developed. Experimental results indicated that the reasonable cutoff frequency and appropriate injection frequency could effectively balance the estimating speed and precision of the estimator.
2017, 44(8):59-64.
Abstract:
The study focued on the influence of different step numbers on torque ripple and noise of motor. Through the Ansoft to calculate 3D electromagnetic field, and add the air gap flux density vector by 3D electromagnetic field calculation, using Ansys. The average of the air gap flux density after superposition to calculate by 2D sound field. To simplify the complex rotor step skewing 3D sound field calculation. Besided a simple process that the rotor could be divided into two segments skewing structure were put forward, the requirements met the process of design also summarized. Through experimental verification the simulation calculation and test were basically identical. To provide a reference for this kind of motor design and calculation.
The study focued on the influence of different step numbers on torque ripple and noise of motor. Through the Ansoft to calculate 3D electromagnetic field, and add the air gap flux density vector by 3D electromagnetic field calculation, using Ansys. The average of the air gap flux density after superposition to calculate by 2D sound field. To simplify the complex rotor step skewing 3D sound field calculation. Besided a simple process that the rotor could be divided into two segments skewing structure were put forward, the requirements met the process of design also summarized. Through experimental verification the simulation calculation and test were basically identical. To provide a reference for this kind of motor design and calculation.
2017, 44(8):65-68.
Abstract:
Based on voltage mode flux linkage, the traditional method usually used lowpass filter easy to be applied in implement instead of pure integral element. However, this method ignored the DC bias and bringed the deviation in phase and amplitude. To solve this problem, put forward the improved flux observation method. In the base of improved method, deduced the corresponding compensation strategy, solving the problem of DC bias. Simulation and experiments showed the effectiveness of the proposed method owning high practical value.
Based on voltage mode flux linkage, the traditional method usually used lowpass filter easy to be applied in implement instead of pure integral element. However, this method ignored the DC bias and bringed the deviation in phase and amplitude. To solve this problem, put forward the improved flux observation method. In the base of improved method, deduced the corresponding compensation strategy, solving the problem of DC bias. Simulation and experiments showed the effectiveness of the proposed method owning high practical value.
2017, 44(8):69-73.
Abstract:
On the basis of the conventional Halbach array permanent magnet motor. A coreless direct drive permanent magnet wind generator with module poles and Halbach arrays was proposed. The structure and advantages of this kind of motor were introduced . With the help of two dimensional (2D) finite element analysis (FEA), we find out the correct combination way of realizing the unilateral magnetic shielding capability and the size of soft magnetic material of rotor poles was optimized, the pole arc coefficients of motor were determined. Compared to traditional permanent magnet motor with Halbach arrays, the optimized novel machine improved the waveform sine degree, reduced the cost and has less permanent magnets based on ensuring a certain extent of air gap magnetic density.
On the basis of the conventional Halbach array permanent magnet motor. A coreless direct drive permanent magnet wind generator with module poles and Halbach arrays was proposed. The structure and advantages of this kind of motor were introduced . With the help of two dimensional (2D) finite element analysis (FEA), we find out the correct combination way of realizing the unilateral magnetic shielding capability and the size of soft magnetic material of rotor poles was optimized, the pole arc coefficients of motor were determined. Compared to traditional permanent magnet motor with Halbach arrays, the optimized novel machine improved the waveform sine degree, reduced the cost and has less permanent magnets based on ensuring a certain extent of air gap magnetic density.
2017, 44(8):74-80.
Abstract:
The motor current signature analysis (MCSA) method for diagnosing broken rotor bars faults in squirrelcage motor had some drawbacks that the diagnostic effects were subject to running state of the motor, which could even lead to a wrong diagnosis of the fault. A novelty approach based on the instantaneous frequency analysis of the startup transient was presented. The proposed approach consists of extracting the monocomponent signals from the startup current by FIR lowpass filtering technique and calculating the instantaneous frequency of the obtained signal, via the derivative of the phase of the analytical signal, and according to the characteristic pattern of the IFson the fsplane, it was judged if the broken rotor bar defect occurs. The experiment verification was performed on a 3 kW motor test bench; the experiment results proved the effectiveness of the proposed method.
The motor current signature analysis (MCSA) method for diagnosing broken rotor bars faults in squirrelcage motor had some drawbacks that the diagnostic effects were subject to running state of the motor, which could even lead to a wrong diagnosis of the fault. A novelty approach based on the instantaneous frequency analysis of the startup transient was presented. The proposed approach consists of extracting the monocomponent signals from the startup current by FIR lowpass filtering technique and calculating the instantaneous frequency of the obtained signal, via the derivative of the phase of the analytical signal, and according to the characteristic pattern of the IFson the fsplane, it was judged if the broken rotor bar defect occurs. The experiment verification was performed on a 3 kW motor test bench; the experiment results proved the effectiveness of the proposed method.
2017, 44(8):81-87.
Abstract:
Demagnetization fault of permanent magnet synchronous motor was one of the most serious fault in motor fault. Demagnetization fault meant that the advantages of permanent magnet synchronous motor was significantly decreased. Put forward a diagnosis method based on CWTHHT of demagnetization fault for permanent magnet synchronous motor and analyzing its feasibility. Firstly, the steady state operation characteristics of permanent magnet synchronous motor were briefly analyzed, experimental platform of motor fault set up, stator current signal of normal and demagnetization of motor collected in real time; Then, the comparison and the analysis showed that the periodicity of component imf4 of current signal EMD decomposition under the demagnetization fault was worse and component imf3 accounted for a large proportion compared with the normal condition. The energy of the fundamental frequency band of current signal of the demagnetization fault was scattered. Therefore, the fault diagnosis method based on CWTHHT was feasible.
Demagnetization fault of permanent magnet synchronous motor was one of the most serious fault in motor fault. Demagnetization fault meant that the advantages of permanent magnet synchronous motor was significantly decreased. Put forward a diagnosis method based on CWTHHT of demagnetization fault for permanent magnet synchronous motor and analyzing its feasibility. Firstly, the steady state operation characteristics of permanent magnet synchronous motor were briefly analyzed, experimental platform of motor fault set up, stator current signal of normal and demagnetization of motor collected in real time; Then, the comparison and the analysis showed that the periodicity of component imf4 of current signal EMD decomposition under the demagnetization fault was worse and component imf3 accounted for a large proportion compared with the normal condition. The energy of the fundamental frequency band of current signal of the demagnetization fault was scattered. Therefore, the fault diagnosis method based on CWTHHT was feasible.
2017, 44(8):88-94.
Abstract:
Along with the development of offshore wind farm and the application of high voltage direct current transmission technology, the problem of the fault ride through had been serious when the AC side of the wind farm faults. Aiming at it, a new flywheel energy storage system for fault ride through was presented, which was based on modular multilevel converter and dual three phase asychronous motor, and design the controller of the system. The flywheel energy storage system used the modular multilevel converter technology to construct the high power and high voltage converter, and the capacity expansion has been obtained. In order to improve the reliability of the flywheel energy storage system, a dual threephase asychronous motor drive was adopted, and the redundancy had been gained. Then a dual threephase asychronous motor drive control algorithm which could balance the capacitor voltage of each module was designed. At last, based on the MATLAB/Simulink platform, the model of the wind farm and the flywheel energy storage system had been simulated and studied. And the simulation verified the functions of the flywheel energy storage system and the performances of the driven control strategy.
Along with the development of offshore wind farm and the application of high voltage direct current transmission technology, the problem of the fault ride through had been serious when the AC side of the wind farm faults. Aiming at it, a new flywheel energy storage system for fault ride through was presented, which was based on modular multilevel converter and dual three phase asychronous motor, and design the controller of the system. The flywheel energy storage system used the modular multilevel converter technology to construct the high power and high voltage converter, and the capacity expansion has been obtained. In order to improve the reliability of the flywheel energy storage system, a dual threephase asychronous motor drive was adopted, and the redundancy had been gained. Then a dual threephase asychronous motor drive control algorithm which could balance the capacitor voltage of each module was designed. At last, based on the MATLAB/Simulink platform, the model of the wind farm and the flywheel energy storage system had been simulated and studied. And the simulation verified the functions of the flywheel energy storage system and the performances of the driven control strategy.
2017, 44(8):95-98.
Abstract:
Fourquadrant pulse converters were widely applied in electric traction drive systems. IGBT was the core device of the fourquadrant pulse converter, which was prone to fail. IGBT opencircuit fault detection for fourquadrant pulse converters was studied. Firstly, the characteristics of the opencircuit faults were analyzed. Then the average value of the grid current was divided by the average value of the current’s absolute value as the detection variable. The detection variable under different power level and each fault was analyzed and the threshold was decided by the detection variable with rated power. Finally, the effectiveness of the detection method was verified by hardwareintheloop simulation.
Fourquadrant pulse converters were widely applied in electric traction drive systems. IGBT was the core device of the fourquadrant pulse converter, which was prone to fail. IGBT opencircuit fault detection for fourquadrant pulse converters was studied. Firstly, the characteristics of the opencircuit faults were analyzed. Then the average value of the grid current was divided by the average value of the current’s absolute value as the detection variable. The detection variable under different power level and each fault was analyzed and the threshold was decided by the detection variable with rated power. Finally, the effectiveness of the detection method was verified by hardwareintheloop simulation.
2017, 44(8):99-103.
Abstract:
Doubly fed induction generators (DFIG) was gradually used in the wind power market, the capacity also increases year by year. Due to poor working conditions of the wind farm, it made DFIG often fail. Stator and rotor windings failure accounted for a large proportion of DFIG fault. A multiloop math model was built for stator winding of DFIG under normal and interturn shortcircuit fault conditions .Based on the extended Park’s vector, the stator terminal current was analyzed by spectrum analysis and the residual voltage after switchoff was analyzed on the residual voltage. The characteristic information was diagnosed by fault information fusion. The simulation results showed that the information fusion method used in motor fault diagnosis, improved the effectiveness of its diagnosis and accuracy.
Doubly fed induction generators (DFIG) was gradually used in the wind power market, the capacity also increases year by year. Due to poor working conditions of the wind farm, it made DFIG often fail. Stator and rotor windings failure accounted for a large proportion of DFIG fault. A multiloop math model was built for stator winding of DFIG under normal and interturn shortcircuit fault conditions .Based on the extended Park’s vector, the stator terminal current was analyzed by spectrum analysis and the residual voltage after switchoff was analyzed on the residual voltage. The characteristic information was diagnosed by fault information fusion. The simulation results showed that the information fusion method used in motor fault diagnosis, improved the effectiveness of its diagnosis and accuracy.
19 Economic Dispatch of Multiple Wind Farms Integrated Power SystemConsidering Conditional ValueAtRisk
2017, 44(8):104-111.
Abstract:
Considering the limitations of single Copula function, the mixCopula was introduced to analysis the wind speed correlations. To harmonize the contradictory between economy and safety, an economic dispatch optimization model for power grid containing multiwind farms was proposed. The model took the uncertainty in wind power under consideration based on conditional valueatrisk theory. In order to simplify the computation, the scene theory was allied to solve the model. Taking IEEE 30bus system with two wind farms as an example, the influence of wind speed correlations and the credit level on the results of probabilistically optimal power flow were analyzed, indicating the feasibility and efficiency of the proposed model.
Considering the limitations of single Copula function, the mixCopula was introduced to analysis the wind speed correlations. To harmonize the contradictory between economy and safety, an economic dispatch optimization model for power grid containing multiwind farms was proposed. The model took the uncertainty in wind power under consideration based on conditional valueatrisk theory. In order to simplify the computation, the scene theory was allied to solve the model. Taking IEEE 30bus system with two wind farms as an example, the influence of wind speed correlations and the credit level on the results of probabilistically optimal power flow were analyzed, indicating the feasibility and efficiency of the proposed model.
2017, 44(8):112-114, 119.
Abstract:
A major change between the wind turbine power performance testing standards of version 2017 and version 2005 was the definition of the wind speed. In version 2017, the wind speed used for power performance evaluation was the rotor equivalent wind speed (REWS). The definition of REWS was studied, and a simplified algorithm of calculating the blade lowertip section area and the blade uppertip section area was proposed. The validity and feasibility of two REWS calculations were provided via examples.
A major change between the wind turbine power performance testing standards of version 2017 and version 2005 was the definition of the wind speed. In version 2017, the wind speed used for power performance evaluation was the rotor equivalent wind speed (REWS). The definition of REWS was studied, and a simplified algorithm of calculating the blade lowertip section area and the blade uppertip section area was proposed. The validity and feasibility of two REWS calculations were provided via examples.
2017, 44(8):115-119.
Abstract:
To analyze corona resistance performance of enameled wire used for the inverter motors in the production process of that, using electromechanical universal testing machine to simulate the stretch of corona resistant enameled wire in the production process of insulation system for the inverter motor. First of all, corona resistant enameled wires were tensile using electromechanical universal testing machine, the elongation of enameled wires were 10%, 15% respectively. Then, initial enameled wire, enameled wire with 10% elongation and enameled wire with 15% elongation were breakdown voltage test and corona resistance test. The results showed that breakdown voltage of enameled wire with 10% elongation and enameled wire with 15% elongation were little worse than that of initial enameled wire, the breakdown voltage retention rate of enameled wire with 15% elongation was more than 85%. Corona resistance time of enameled wire with 10% elongation and enameled wire with 15% elongation were much worse than that of initial enameled wire, corona resistance time of enameled wire with 15% elongation was litter worse than that of enameled wire with 10% elongation. The corona resistance time retention rate of enameled wire with 10% elongation was less than 20%.
To analyze corona resistance performance of enameled wire used for the inverter motors in the production process of that, using electromechanical universal testing machine to simulate the stretch of corona resistant enameled wire in the production process of insulation system for the inverter motor. First of all, corona resistant enameled wires were tensile using electromechanical universal testing machine, the elongation of enameled wires were 10%, 15% respectively. Then, initial enameled wire, enameled wire with 10% elongation and enameled wire with 15% elongation were breakdown voltage test and corona resistance test. The results showed that breakdown voltage of enameled wire with 10% elongation and enameled wire with 15% elongation were little worse than that of initial enameled wire, the breakdown voltage retention rate of enameled wire with 15% elongation was more than 85%. Corona resistance time of enameled wire with 10% elongation and enameled wire with 15% elongation were much worse than that of initial enameled wire, corona resistance time of enameled wire with 15% elongation was litter worse than that of enameled wire with 10% elongation. The corona resistance time retention rate of enameled wire with 10% elongation was less than 20%.
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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.
