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Volume 44,Issue 7,2017 Table of Contents
2017, 44(7):1-6, 25.
Abstract:
The policies promulgated and being established by the government since 12th fiveyear were introduced, which were related to the development of the motor industry. The policies include the promotion of high efficiency motors which conducive to energy conservation and environmental protection, catalogue of advanced, practical and promotional energysaving technology in the field of motor, energy efficiency star and so on. It had a certain guiding significance for the development of the motor industry.
The policies promulgated and being established by the government since 12th fiveyear were introduced, which were related to the development of the motor industry. The policies include the promotion of high efficiency motors which conducive to energy conservation and environmental protection, catalogue of advanced, practical and promotional energysaving technology in the field of motor, energy efficiency star and so on. It had a certain guiding significance for the development of the motor industry.
2017, 44(7):7-12, 25.
Abstract:
The characteristics of electromagnetic design and structural design of synchronous generator for high voltage frequency converter were introduced. Based on the twodimensional timedomain finite element method, the electromagnetic characteristics of the two electrical machinery, such as harmonic distribution, air gap magnetic field time distribution, and the starting process of the damping ring, were calculated and analyzed. The feasibility of the design scheme was verified by the analysis of the motor type test of the synchronous generator, which laid the foundation for the further application of this kind of high voltage synchronous generator set in the field of high voltage frequency converter.
The characteristics of electromagnetic design and structural design of synchronous generator for high voltage frequency converter were introduced. Based on the twodimensional timedomain finite element method, the electromagnetic characteristics of the two electrical machinery, such as harmonic distribution, air gap magnetic field time distribution, and the starting process of the damping ring, were calculated and analyzed. The feasibility of the design scheme was verified by the analysis of the motor type test of the synchronous generator, which laid the foundation for the further application of this kind of high voltage synchronous generator set in the field of high voltage frequency converter.
2017, 44(7):13-19.
Abstract:
Because there exist eddy current loss in permanent magnet, it will give off in the form of heat. This will cause high temperature in disc permanent magnet synchronous motor (DPMSM). When the temperature is too high, it will cause the problem of degenerate performance of the motor. So conducted intensive studies on the permanent magnets of motor, and further research on these issues was of great significance to improve the performance of disc permanent magnet synchronous motor and its optimization design. In order to reduce the eddy current loss of permanent magnet, the methods of the permanent magnet segment and shielding layer was used. Maxwell, threedimensional finite element analysis software, was used to establish the finite element model of the motor, reveal the electromagnetic distribution around permanent magnet and receive the average eddy current loss of permanent magnet when the motor was driven by threephase sinusoidal current source. The method, segment in several different directions and simulation, was applied to show that the splitting into three pieces horizontally was the best by comparison, when the permanent magnets were segmented. Firstly, the principle’s reliability should be verified, and then the optimal value of shielding layer thickness could be get by MATLAB curve fitting, when using the electromagnetic shielding principle reduce eddy current loss.
Because there exist eddy current loss in permanent magnet, it will give off in the form of heat. This will cause high temperature in disc permanent magnet synchronous motor (DPMSM). When the temperature is too high, it will cause the problem of degenerate performance of the motor. So conducted intensive studies on the permanent magnets of motor, and further research on these issues was of great significance to improve the performance of disc permanent magnet synchronous motor and its optimization design. In order to reduce the eddy current loss of permanent magnet, the methods of the permanent magnet segment and shielding layer was used. Maxwell, threedimensional finite element analysis software, was used to establish the finite element model of the motor, reveal the electromagnetic distribution around permanent magnet and receive the average eddy current loss of permanent magnet when the motor was driven by threephase sinusoidal current source. The method, segment in several different directions and simulation, was applied to show that the splitting into three pieces horizontally was the best by comparison, when the permanent magnets were segmented. Firstly, the principle’s reliability should be verified, and then the optimal value of shielding layer thickness could be get by MATLAB curve fitting, when using the electromagnetic shielding principle reduce eddy current loss.
2017, 44(7):20-25.
Abstract:
Aimed at problems of high frequency ripple component exists permanent magnet synchronous motor (PMSM) parameter error caused by the sliding mode observer estimation error and counter electromotive force. However, a lowpass filter cannot eliminate the high frequency ripple, Therefore, the introduction of the Kalman filter to eliminate highfrequency ripple, making permanent magnet synchronous motor control system had better steady state performance and dynamic response. Then a MATLAB platform was built to validate this method, the experimental results showed that after the increase in the Kalman filter sliding mode observer not only robust, and to some extent inhibited the buffeting, there was some increase in the rapid and dynamic performance.
Aimed at problems of high frequency ripple component exists permanent magnet synchronous motor (PMSM) parameter error caused by the sliding mode observer estimation error and counter electromotive force. However, a lowpass filter cannot eliminate the high frequency ripple, Therefore, the introduction of the Kalman filter to eliminate highfrequency ripple, making permanent magnet synchronous motor control system had better steady state performance and dynamic response. Then a MATLAB platform was built to validate this method, the experimental results showed that after the increase in the Kalman filter sliding mode observer not only robust, and to some extent inhibited the buffeting, there was some increase in the rapid and dynamic performance.
2017, 44(7):26-29.
Abstract:
Magnetization curve was strongly nonlinear function. It was important to improve the accuracy of the magnetization curve fitting for the model of electrical equipment containing ferromagnetic material. Therefore, a method of magnetization curve fitting based on PSOLSSVM algorithm was proposed. The method used particle swarm optimization algorithm to solve the LSSVM parameters selection problem. The simulation results showed that PSOLSSVM algorithm could obtain optimal LSSVM parameters and the magnetization curve used PSOLSSVM algorithm has high fitting accuracy.
Magnetization curve was strongly nonlinear function. It was important to improve the accuracy of the magnetization curve fitting for the model of electrical equipment containing ferromagnetic material. Therefore, a method of magnetization curve fitting based on PSOLSSVM algorithm was proposed. The method used particle swarm optimization algorithm to solve the LSSVM parameters selection problem. The simulation results showed that PSOLSSVM algorithm could obtain optimal LSSVM parameters and the magnetization curve used PSOLSSVM algorithm has high fitting accuracy.
2017, 44(7):30-33, 58.
Abstract:
In order to solve the problem of bidirectional driving of the liner motor for valve moving and the dither during the process, researched and developed an amplifier that driving a new type of dynamic electromechanical transducer by using pulse width modulated signal, put forward a driving scheme that overlay dither signal on a pulse width modulated signal. The solution could solve the hysteresis phenomenon of motor during the movements, improved static and dynamic performance of proportional valve, reduced motion loss. Theoretical analysis and simulation results showed that the proportion amplifier device was reliable and could meet the electromechanical converter moving coil drive requirement.
In order to solve the problem of bidirectional driving of the liner motor for valve moving and the dither during the process, researched and developed an amplifier that driving a new type of dynamic electromechanical transducer by using pulse width modulated signal, put forward a driving scheme that overlay dither signal on a pulse width modulated signal. The solution could solve the hysteresis phenomenon of motor during the movements, improved static and dynamic performance of proportional valve, reduced motion loss. Theoretical analysis and simulation results showed that the proportion amplifier device was reliable and could meet the electromechanical converter moving coil drive requirement.
2017, 44(7):34-38, 65.
Abstract:
The excitation regulator of synchronous impulse generator using CompactRIO and LabVIEW based on graph language had been developed. The excitation regulator including host computer and embedded realtime hardware was able to control and supervise the working conditions and parameters of voltage and current in very one millisecond during a pulse of discharging. The digital incremental PID control algorithm was utilizing in the regulator to be control of voltage pulse precisely. Requirements of impulse generator’s excitation in adjustment of excitation waveform and operating model of periodical starting and ending were meet.
The excitation regulator of synchronous impulse generator using CompactRIO and LabVIEW based on graph language had been developed. The excitation regulator including host computer and embedded realtime hardware was able to control and supervise the working conditions and parameters of voltage and current in very one millisecond during a pulse of discharging. The digital incremental PID control algorithm was utilizing in the regulator to be control of voltage pulse precisely. Requirements of impulse generator’s excitation in adjustment of excitation waveform and operating model of periodical starting and ending were meet.
2017, 44(7):39-41.
Abstract:
Some current standards for waster submersible motorpump are similar, which are essentially consistent by detailly contrasted and analysised ,and apply to waster submersible motorpumps. These standards belong to different focal point, which results in simultaneously completed. The article suggested the National Machinery Industry Federation to coordinate and unify, standard take long to develop a more complete advanced waster submersible motorpump standards.
Some current standards for waster submersible motorpump are similar, which are essentially consistent by detailly contrasted and analysised ,and apply to waster submersible motorpumps. These standards belong to different focal point, which results in simultaneously completed. The article suggested the National Machinery Industry Federation to coordinate and unify, standard take long to develop a more complete advanced waster submersible motorpump standards.
2017, 44(7):42-47.
Abstract:
In model predictive control system, the large amount of calculation could lead to action delay and the error would be introduced to system due to the inaccuracy discrete method. Under the condition of large sample time, the two conditions above would lead to a bad performance of the system. To solve the problem, the bilinear transformation method was taken to obtain a more accurate discrete model of motor. And this discrete method could guarantee the stability of system. Delay compensation was introduced to the system to reduce the current ripple due to the problem of action delay. Simulation and experiment results showed that the predictive system above had the advantages of better dynamic track performance, little current ripple and strong resistance to load disturbance.
In model predictive control system, the large amount of calculation could lead to action delay and the error would be introduced to system due to the inaccuracy discrete method. Under the condition of large sample time, the two conditions above would lead to a bad performance of the system. To solve the problem, the bilinear transformation method was taken to obtain a more accurate discrete model of motor. And this discrete method could guarantee the stability of system. Delay compensation was introduced to the system to reduce the current ripple due to the problem of action delay. Simulation and experiment results showed that the predictive system above had the advantages of better dynamic track performance, little current ripple and strong resistance to load disturbance.
2017, 44(7):48-53.
Abstract:
During the operation of permanent magnet synchronous motor (PMSM), parameter mismatches caused by timevarying motor parameters between real motor and model in predictive current controller lead to the degradation of the control performance. Presented an improved predictive current control method based on the model reference adaptive system (MRAS). d, qaxis current equation in the rotating coordinate system was utilized as a reference model in this method. Based on Popov’s hyperstability theory, online identification system of inductance and flux for PMSM was established. The identification parameters obtained were used in the predictive current control model, thus online updating of the control model parameters was achieved. Analysis and simulation results showed that this method efficiently improved the performance of predictive current control under the motor parameters change.
During the operation of permanent magnet synchronous motor (PMSM), parameter mismatches caused by timevarying motor parameters between real motor and model in predictive current controller lead to the degradation of the control performance. Presented an improved predictive current control method based on the model reference adaptive system (MRAS). d, qaxis current equation in the rotating coordinate system was utilized as a reference model in this method. Based on Popov’s hyperstability theory, online identification system of inductance and flux for PMSM was established. The identification parameters obtained were used in the predictive current control model, thus online updating of the control model parameters was achieved. Analysis and simulation results showed that this method efficiently improved the performance of predictive current control under the motor parameters change.
11 Parameter AutoCommissioning Method for SurfaceMounted PermanentMagnet Linear Synchronous Motor Drive
2017, 44(7):54-58.
Abstract:
Directed against the problem of repetitious measurement and accommodation of the parameters of the vector control system of surfacemounted permanent magnet linear synchronous motor (SPMLSM), a method of automatic setting was proposed. By applying the linear velocity measurement current controller output waveform and calculating the corresponding Walsh coefficients of first order iteratively until the Walsh coefficients converge to zero, the electrical parameter of surfacemounted permanent magnet linear synchronous motor could be identified automatically and the mechanical parameters of the free running motor could be identified and finally the PI parameters of the speed controller and current controller could be calculated. The validity of the proposed method was verified by the prototype test results.
Directed against the problem of repetitious measurement and accommodation of the parameters of the vector control system of surfacemounted permanent magnet linear synchronous motor (SPMLSM), a method of automatic setting was proposed. By applying the linear velocity measurement current controller output waveform and calculating the corresponding Walsh coefficients of first order iteratively until the Walsh coefficients converge to zero, the electrical parameter of surfacemounted permanent magnet linear synchronous motor could be identified automatically and the mechanical parameters of the free running motor could be identified and finally the PI parameters of the speed controller and current controller could be calculated. The validity of the proposed method was verified by the prototype test results.
2017, 44(7):59-65.
Abstract:
Compared with the traditional voltage source inverter (VSI) and current source inverter (CSI), Zsource inverter had the ability like buckboost conversion and no dead time was needed in phase legs,so high reliability could be achieved. A space vector pulse width modulation (SVPWM) technique was modified to realize the shootthrough zero vectors in the Zsource inverter(ZSI). The Zsource inverter could generate a more ideal sinusoidal AC output voltage and step up the DClink voltage in any multiple. For the Zsource inverter, the traditional control strategy often used the double loop PI control of outer voltage loop and inner current loop. It was hard to achieve higher control accuracy while using the control of traditional double PI loop and the harmonic distortion rate of gridconnected current was high. According to the limitations of traditional PI control, a fuzzy PI controller was proposed. The controller took advantage of fuzzy control to adjust the PI parameter online according to the error, so as to meet the requirments of optimal performance. Through the simulation experiment the effectiveness and validity of the proposed method were verified.
Compared with the traditional voltage source inverter (VSI) and current source inverter (CSI), Zsource inverter had the ability like buckboost conversion and no dead time was needed in phase legs,so high reliability could be achieved. A space vector pulse width modulation (SVPWM) technique was modified to realize the shootthrough zero vectors in the Zsource inverter(ZSI). The Zsource inverter could generate a more ideal sinusoidal AC output voltage and step up the DClink voltage in any multiple. For the Zsource inverter, the traditional control strategy often used the double loop PI control of outer voltage loop and inner current loop. It was hard to achieve higher control accuracy while using the control of traditional double PI loop and the harmonic distortion rate of gridconnected current was high. According to the limitations of traditional PI control, a fuzzy PI controller was proposed. The controller took advantage of fuzzy control to adjust the PI parameter online according to the error, so as to meet the requirments of optimal performance. Through the simulation experiment the effectiveness and validity of the proposed method were verified.
2017, 44(7):66-70.
Abstract:
According to the hardware platform and electrical circuit of the motor rotor polishing machine, Mitsubishi PLC Fx1s for the polishing machine operation control system were designed. Using executive components such as rotor clamp, adjustable slider, polishing machine and dust collector were controlled. In addition, the touch screen and operation interface were designed. Complete sets of equipment had been applied to the engineering practice.
According to the hardware platform and electrical circuit of the motor rotor polishing machine, Mitsubishi PLC Fx1s for the polishing machine operation control system were designed. Using executive components such as rotor clamp, adjustable slider, polishing machine and dust collector were controlled. In addition, the touch screen and operation interface were designed. Complete sets of equipment had been applied to the engineering practice.
2017, 44(7):71-75, 97.
Abstract:
The permanent magnet synchronous traction machine was a typical nonlinear multivariable coupled system, there was crosscoupling between dqcurrents in synchronousframe, the dqcurrents could not be decoupled by the traditional PI, a combination of high performance permanent magnet synchronous traction machine control method based on the intima of the control principle and space vector algorithm decoupling was proposed, the internal model control (IMC) was used to control an ideal motor decoupled model, which was designed to dynamic decoupling of the stator current crosscoupling potential, the system dynamic response performance was improved,the robustness of parameter uncertainties and disturbances in the current loops was satisfied, extra motor parameters and hardwares were not necessary in this method, the experimental results showed the feasibility and effectiveness.
The permanent magnet synchronous traction machine was a typical nonlinear multivariable coupled system, there was crosscoupling between dqcurrents in synchronousframe, the dqcurrents could not be decoupled by the traditional PI, a combination of high performance permanent magnet synchronous traction machine control method based on the intima of the control principle and space vector algorithm decoupling was proposed, the internal model control (IMC) was used to control an ideal motor decoupled model, which was designed to dynamic decoupling of the stator current crosscoupling potential, the system dynamic response performance was improved,the robustness of parameter uncertainties and disturbances in the current loops was satisfied, extra motor parameters and hardwares were not necessary in this method, the experimental results showed the feasibility and effectiveness.
15 Design and Realization of Communication Network of SCADA Systemin Metropolitan Sewage Transportion
2017, 44(7):76-79.
Abstract:
Through analysis of the several communication technology, according to SCADA system in the metropolitan sewage transportion, completely unattended operation in the sewage pumping station. Used MPLSVPN technology to upgrade the communication network of the central monitoring system of the first stage of the Shanghai sewerage project that had run for 24 years. We complete integration stable transmission SCADA system in the metropolitan sewage transportion pumping station data and video image of the equipment running, Security precaution information according to the high reliability, high safety, scalability and good economical efficiency over the MPLSVPN technology.It injection new vitality for the tradition of SCADA system in the metropolitan sewage transportion that had stable run for 20 years.
Through analysis of the several communication technology, according to SCADA system in the metropolitan sewage transportion, completely unattended operation in the sewage pumping station. Used MPLSVPN technology to upgrade the communication network of the central monitoring system of the first stage of the Shanghai sewerage project that had run for 24 years. We complete integration stable transmission SCADA system in the metropolitan sewage transportion pumping station data and video image of the equipment running, Security precaution information according to the high reliability, high safety, scalability and good economical efficiency over the MPLSVPN technology.It injection new vitality for the tradition of SCADA system in the metropolitan sewage transportion that had stable run for 20 years.
2017, 44(7):80-85, 107.
Abstract:
Based on the scheme of frequency converter driving loading motor which was coupled to gear box and companion motor, the Floyd algorithm was applied to optimize the loading motor pole and transmission ratio of the gear box. Meanwhile, the double power and overload capacity of double threephase motor were utilized to expand the test ability and reduce the test motors. In order to meet the loading requirements, the masterslave technology was used to control the torque and speed at the end.
Based on the scheme of frequency converter driving loading motor which was coupled to gear box and companion motor, the Floyd algorithm was applied to optimize the loading motor pole and transmission ratio of the gear box. Meanwhile, the double power and overload capacity of double threephase motor were utilized to expand the test ability and reduce the test motors. In order to meet the loading requirements, the masterslave technology was used to control the torque and speed at the end.
2017, 44(7):86-91.
Abstract:
According to the low voltage transfer ratio of matrix converter (MC) and immune to the influence of abnormal input voltage for double feed inductor generator (DFIG) excited by MC, A Zsource sparse matrix converter suited for being used as excitation power supply for DFIG was presented. the voltage transfer ratio had been improved using the Zsource boost feature and the influence caused by abnormal input voltage had been avoided using closed loop control. The expression of the variable speed constant frequency wind power generation system of stator flux oriented vector control was deduced based on the analysis of the doublefed wind generators working principle and mathematical model. A experimental prototype had been built, the experimental results working under subsynchronous, synchronization and supersynchronous verified the feasibility and effectiveness of the proposed strategy.
According to the low voltage transfer ratio of matrix converter (MC) and immune to the influence of abnormal input voltage for double feed inductor generator (DFIG) excited by MC, A Zsource sparse matrix converter suited for being used as excitation power supply for DFIG was presented. the voltage transfer ratio had been improved using the Zsource boost feature and the influence caused by abnormal input voltage had been avoided using closed loop control. The expression of the variable speed constant frequency wind power generation system of stator flux oriented vector control was deduced based on the analysis of the doublefed wind generators working principle and mathematical model. A experimental prototype had been built, the experimental results working under subsynchronous, synchronization and supersynchronous verified the feasibility and effectiveness of the proposed strategy.
2017, 44(7):92-97.
Abstract:
In order to achieve highperformance of the control system, fractionalorder PIλ controller was applied to directdrive permanent magnet synchronous generation (PMSG) wind turbine systems. Focused on the fractionalorder PIλ controller parameters design method of system mentioned above. Through the system simulation and comparative analysis, the result showed that the fractionalorder PIλ controller system had faster response speed and higher power output performance than the integerorder one. The fractionalorder PIλ controller system had certain development potential and practical value in PMSG wind turbine systems.
In order to achieve highperformance of the control system, fractionalorder PIλ controller was applied to directdrive permanent magnet synchronous generation (PMSG) wind turbine systems. Focused on the fractionalorder PIλ controller parameters design method of system mentioned above. Through the system simulation and comparative analysis, the result showed that the fractionalorder PIλ controller system had faster response speed and higher power output performance than the integerorder one. The fractionalorder PIλ controller system had certain development potential and practical value in PMSG wind turbine systems.
2017, 44(7):98-107.
Abstract:
The effects of converter control parameters of DFIG wind generation system on the oscillation modes were studied. A complete small signal model in MATLAB/Simulink was proposed. By using eigenvalue and participation factors analysis, the oscillation modes were discovered and classified. By altering the parameters of converter, the changes of oscillation modes were studied. Finally, simulation was done on the MATLAB/Simulink. The research showed that the oscillation could be suppressed by optimizing the control parameters of converter.
The effects of converter control parameters of DFIG wind generation system on the oscillation modes were studied. A complete small signal model in MATLAB/Simulink was proposed. By using eigenvalue and participation factors analysis, the oscillation modes were discovered and classified. By altering the parameters of converter, the changes of oscillation modes were studied. Finally, simulation was done on the MATLAB/Simulink. The research showed that the oscillation could be suppressed by optimizing the control parameters of converter.
2017, 44(7):108-114.
Abstract:
With the rising proportion of wind power generation, the effects on grid made by its randomness、volatility and intermittency can not be ignored. Based on hybrid energy storage system composed of super capacitor and battery, a adaptive composite energy storage control strategy to dampen the power fluctuations of wind farm was proposed. The feedback of super capacitor’s state to implement the control of lowpass filter and highpass filter’s time constant was introduced. It finished suppressing the power fluctuations and distribute the power reasonably to avoid overcharging/overdischarging of super capacitor at the same time. Finally, through the simulation of suppressing the power fluctuations under different time window for spring, summer, autumn and winter the effectiveness of the proposed adaptive control strategy was verified.
With the rising proportion of wind power generation, the effects on grid made by its randomness、volatility and intermittency can not be ignored. Based on hybrid energy storage system composed of super capacitor and battery, a adaptive composite energy storage control strategy to dampen the power fluctuations of wind farm was proposed. The feedback of super capacitor’s state to implement the control of lowpass filter and highpass filter’s time constant was introduced. It finished suppressing the power fluctuations and distribute the power reasonably to avoid overcharging/overdischarging of super capacitor at the same time. Finally, through the simulation of suppressing the power fluctuations under different time window for spring, summer, autumn and winter the effectiveness of the proposed adaptive control strategy was verified.
2017, 44(7):115-121.
Abstract:
According to the performance characteristics of the driving motor for electric vehicle, analysis of motor control performance, motor body design and enterprise qualification from the drive motor system, applying of analytic hierarchy process (AHP) to determine the performance evaluation index system and index weight of the driving motor, a BP neural network model of performance evaluating for drive motor, and the chicken group algorithm (CSO) was used to optimize the model. The simulation results showed that the performance evaluation method of drive motor based on AHP and CSOBP neural network has the advantages of high speed and high accuracy, and get satisfactory result, this have good engineering practical value to evaluation, selection and application for electric vehicle drive motor system.
According to the performance characteristics of the driving motor for electric vehicle, analysis of motor control performance, motor body design and enterprise qualification from the drive motor system, applying of analytic hierarchy process (AHP) to determine the performance evaluation index system and index weight of the driving motor, a BP neural network model of performance evaluating for drive motor, and the chicken group algorithm (CSO) was used to optimize the model. The simulation results showed that the performance evaluation method of drive motor based on AHP and CSOBP neural network has the advantages of high speed and high accuracy, and get satisfactory result, this have good engineering practical value to evaluation, selection and application for electric vehicle drive motor system.
22 Remanufacturing of Permanent Magnet Synchronous Motor forElectric Vehicle Based on Rotor Redesign
2017, 44(7):122-128.
Abstract:
With the development of electric vehicle, there were more and more old motor which would be replaced and obsoleted, it was also necessary to study the remanufacturing of the old motor. In order to improve the performance of the motor, the optimization of the outer circle of the rotor was used to reduce the saturation magnetic density area and optimize the air gap structure. How different eccentric circle effect on cogging torque was analyzed, the changes of performance of the old motor and the remanufacturing motor were compared. The magnetic flux density of motor harmonic and cogging torque trend with the different of chamfering circle was researched. The result showed that the cogging torque increased first and then decreased with eccentric circle increasing, chamfering circle had little influence on harmonic. Under the rated conditions, when the eccentric circle of remanufacturing motor was 36 mm and the chamfering circle was 4 mm, core loss of remanufacturing motor decreased by 6.55 W/kg, efficiency increased by 0.05% and output torque was reduced by 4%. The remanufacturing motor was made to reduce the loss and increase the efficiency, the output torque was reduced.
With the development of electric vehicle, there were more and more old motor which would be replaced and obsoleted, it was also necessary to study the remanufacturing of the old motor. In order to improve the performance of the motor, the optimization of the outer circle of the rotor was used to reduce the saturation magnetic density area and optimize the air gap structure. How different eccentric circle effect on cogging torque was analyzed, the changes of performance of the old motor and the remanufacturing motor were compared. The magnetic flux density of motor harmonic and cogging torque trend with the different of chamfering circle was researched. The result showed that the cogging torque increased first and then decreased with eccentric circle increasing, chamfering circle had little influence on harmonic. Under the rated conditions, when the eccentric circle of remanufacturing motor was 36 mm and the chamfering circle was 4 mm, core loss of remanufacturing motor decreased by 6.55 W/kg, efficiency increased by 0.05% and output torque was reduced by 4%. The remanufacturing motor was made to reduce the loss and increase the efficiency, the output torque was reduced.
2017, 44(7):129-135.
Abstract:
Put forward a constant torque fuzzy control strategy to solve the problem of low efficiency in electric vehicles energy feedback braking. At first, made the analysis of the basic principles of energy regenerative braking of BLDCM. At the same time, a threedimensional fuzzy controller through the comparative analysis of the different feedback control strategy was designed, and a BLDCM regenerative braking system simulation model in the MATLAB/Simulink environment was established. Results showed that the control strategy reached good control effects to motor braking torque and energy recuperation.
Put forward a constant torque fuzzy control strategy to solve the problem of low efficiency in electric vehicles energy feedback braking. At first, made the analysis of the basic principles of energy regenerative braking of BLDCM. At the same time, a threedimensional fuzzy controller through the comparative analysis of the different feedback control strategy was designed, and a BLDCM regenerative braking system simulation model in the MATLAB/Simulink environment was established. Results showed that the control strategy reached good control effects to motor braking torque and energy recuperation.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
