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Volume 45,Issue 8,2018 Table of Contents
2018, 45(8):1-7.
Abstract:
A sensorless control algorithm for surface PMLSM was designed. To overcome the drawback that the stator′s back EMF was too low to observe at low speed, an integral mathematical model of stator voltage was established in stationary reference frame axes, and the back EMF observation term was decoupled into an integral term with fixed amplitude and could be easily measured. Because of the influence of observation noise, the burr phenomenon of velocity signal obtained by traditional direct calculation method was serious. This algorithm used phase locked loop technology (PLL) to extract rotor position and speed signal. The secondorder frequency domain mathematical model of PLL was established to analyze its steadystate performance, and the dynamic tracking ability of PLL was discussed in the presence of phase jump, frequency step and frequency ramp of input signal. The simulation results showed that the algorithm could realize accurate observation of the rotor position and speed, and the control system had good stability and controllability.
A sensorless control algorithm for surface PMLSM was designed. To overcome the drawback that the stator′s back EMF was too low to observe at low speed, an integral mathematical model of stator voltage was established in stationary reference frame axes, and the back EMF observation term was decoupled into an integral term with fixed amplitude and could be easily measured. Because of the influence of observation noise, the burr phenomenon of velocity signal obtained by traditional direct calculation method was serious. This algorithm used phase locked loop technology (PLL) to extract rotor position and speed signal. The secondorder frequency domain mathematical model of PLL was established to analyze its steadystate performance, and the dynamic tracking ability of PLL was discussed in the presence of phase jump, frequency step and frequency ramp of input signal. The simulation results showed that the algorithm could realize accurate observation of the rotor position and speed, and the control system had good stability and controllability.
2018, 45(8):8-14.
Abstract:
In order to improve the reliability of the permanent magnet synchronous motor (PMSM) servo system, a dualredundancy PMSM servo system based on multiple parallel branches was given, the basic principles of redundancy design and control driving were proposed. Besides the mathematical models of the dualredundancy PMSM servo system based on multiple parallel branches were built, including magnetic chain equilibrium equation, voltage balance equation, torque equation, mechanical motion equation and the block diagram of current control system as well as stability analysis. According to mathematical model, the simulation of its failure working state was conducted to verify the faulttolerant performance of dualredundancy PMSM servo system based on MATLAB/Simulink.
In order to improve the reliability of the permanent magnet synchronous motor (PMSM) servo system, a dualredundancy PMSM servo system based on multiple parallel branches was given, the basic principles of redundancy design and control driving were proposed. Besides the mathematical models of the dualredundancy PMSM servo system based on multiple parallel branches were built, including magnetic chain equilibrium equation, voltage balance equation, torque equation, mechanical motion equation and the block diagram of current control system as well as stability analysis. According to mathematical model, the simulation of its failure working state was conducted to verify the faulttolerant performance of dualredundancy PMSM servo system based on MATLAB/Simulink.
2018, 45(8):15-18, 62.
Abstract:
In order to solve the problem that the inherent parameters of the permanent magnet synchronous motor (PMSM) were changed due to external interference, a new intelligent control technology was introduced into the control system of PMSM, and a new control strategy based on the integral backstepping adaptive method was proposed. The controller could dynamically suppress and eliminate the influence of parameter changes on the system by using the cross axis current. Based on the Lyapunov stability principle, the control laws and the adaptive laws of the controlled system were designed, and the integral action was introduced to improve the stability and shorten the time of the speed response. The simulation experiments showed that the controller had strong robustness as well as good dynamic and static performance to suppress the influence of the change of the inherent parameters.
In order to solve the problem that the inherent parameters of the permanent magnet synchronous motor (PMSM) were changed due to external interference, a new intelligent control technology was introduced into the control system of PMSM, and a new control strategy based on the integral backstepping adaptive method was proposed. The controller could dynamically suppress and eliminate the influence of parameter changes on the system by using the cross axis current. Based on the Lyapunov stability principle, the control laws and the adaptive laws of the controlled system were designed, and the integral action was introduced to improve the stability and shorten the time of the speed response. The simulation experiments showed that the controller had strong robustness as well as good dynamic and static performance to suppress the influence of the change of the inherent parameters.
2018, 45(8):19-23, 85.
Abstract:
An improved rotor position estimation method of permanent magnet synchronous motor (PMSM) using Halleffect sensors was proposed. According to the Newton interpolation method, the curve fitting of discrete locations provided by Hall sensors was made. The realtime position information of the motor rotor was estimated in the algorithm for position fitting and interpolating. This method promised to eliminate the step position of the rotor position estimation and provided stable and reliable rotor position information, so that the stability of the closedloop system was improved. The simulation based on the simulation platform of Plecs was built. Compared with the traditional estimation method of rotor position, the results illustrated the effectiveness of the proposed method.
An improved rotor position estimation method of permanent magnet synchronous motor (PMSM) using Halleffect sensors was proposed. According to the Newton interpolation method, the curve fitting of discrete locations provided by Hall sensors was made. The realtime position information of the motor rotor was estimated in the algorithm for position fitting and interpolating. This method promised to eliminate the step position of the rotor position estimation and provided stable and reliable rotor position information, so that the stability of the closedloop system was improved. The simulation based on the simulation platform of Plecs was built. Compared with the traditional estimation method of rotor position, the results illustrated the effectiveness of the proposed method.
5 Research on Fault Tolerant Control of Permanent Magnet SynchronousMotor Driven by ParalleledInverter
2018, 45(8):24-32, 55.
Abstract:
In order to improve the reliability of permanent magnet synchronous motor (PMSM) driving system with paralleledinverter, two kinds of fault tolerant control schemes of PMSM driven by paralleledinverter with the comparative study method were designed, which were the normal channel current compensation scheme and equivalent current value compensation scheme. Two kinds of faulttolerant control schemes were different from the traditional scheme, isolating faulty inverters as a whole, but making full use of all nonfault inverter bridge arms to reduce copper consumption under fault conditions and output smooth torque. In addition, both of the new schemes incorporate a proportional resonant current controller to track the asymmetrical reference current and avoid possible outofloop currents between the parallel inverters. Finally, through the fault tolerant control experiment of PMSM driving system with paralleledinverter, the effect of the new faulttolerant control strategy was verified.
In order to improve the reliability of permanent magnet synchronous motor (PMSM) driving system with paralleledinverter, two kinds of fault tolerant control schemes of PMSM driven by paralleledinverter with the comparative study method were designed, which were the normal channel current compensation scheme and equivalent current value compensation scheme. Two kinds of faulttolerant control schemes were different from the traditional scheme, isolating faulty inverters as a whole, but making full use of all nonfault inverter bridge arms to reduce copper consumption under fault conditions and output smooth torque. In addition, both of the new schemes incorporate a proportional resonant current controller to track the asymmetrical reference current and avoid possible outofloop currents between the parallel inverters. Finally, through the fault tolerant control experiment of PMSM driving system with paralleledinverter, the effect of the new faulttolerant control strategy was verified.
2018, 45(8):33-38.
Abstract:
When using Antirotary permanent synchronous motor with vector control, it could be equivalent that two identical motors were connected in series and controlled in the same space coordinate system. When the load changes suddenly, both sides of the rotor speed changes, due to the slow adjustment of PI, both sides of the rotor prone to out of synchronization, the system will not be controlled. To solve the problem of losing step of rotating permanent magnet synchronous motor, the daxis current increment and the qaxis current increment of the rotating motor in the rotating coordinate system were selected as the state variables, the model predictive control which was suitable for the commutation motor was studied, and the model predictive current control algorithm for the commutation motor was proposed. The control method of dynamic response fast, and could effectively avoid overshoot, with good control performance. The simulation results showed that the model predictive control was faster than the traditional PI regulator, and could effectively solve the problem of losing the step of the rotating motor.
When using Antirotary permanent synchronous motor with vector control, it could be equivalent that two identical motors were connected in series and controlled in the same space coordinate system. When the load changes suddenly, both sides of the rotor speed changes, due to the slow adjustment of PI, both sides of the rotor prone to out of synchronization, the system will not be controlled. To solve the problem of losing step of rotating permanent magnet synchronous motor, the daxis current increment and the qaxis current increment of the rotating motor in the rotating coordinate system were selected as the state variables, the model predictive control which was suitable for the commutation motor was studied, and the model predictive current control algorithm for the commutation motor was proposed. The control method of dynamic response fast, and could effectively avoid overshoot, with good control performance. The simulation results showed that the model predictive control was faster than the traditional PI regulator, and could effectively solve the problem of losing the step of the rotating motor.
2018, 45(8):39-44.
Abstract:
The research of electrically excited synchronous motor (EESM) was based on magnetic coupling resonancewireless power transfer system. To overcome the disadvantages of EESM slipring brush′s structural unreliability and requirement of maintenance, resonant radio transmission mode could be used as a way of providing excitation energy for the rotor. By modeling on EESM and discussing on the method of rotor field oriented control, EESM control system model was established. Through the prototype test, EESM rotor field oriented control and resonant wireless excitation method carried on the confirmation through the experiment primarily.
The research of electrically excited synchronous motor (EESM) was based on magnetic coupling resonancewireless power transfer system. To overcome the disadvantages of EESM slipring brush′s structural unreliability and requirement of maintenance, resonant radio transmission mode could be used as a way of providing excitation energy for the rotor. By modeling on EESM and discussing on the method of rotor field oriented control, EESM control system model was established. Through the prototype test, EESM rotor field oriented control and resonant wireless excitation method carried on the confirmation through the experiment primarily.
2018, 45(8):45-49, 67.
Abstract:
The design of a locking pin type lock with high reliability under harsh temperature and mechanical environment was introduced.The principle and structure of the work were introduced.In view of the faults in actual use, corresponding improvement design measures were adopted and verified by tests, the design points and details of this kind of lock maker were put forward.
The design of a locking pin type lock with high reliability under harsh temperature and mechanical environment was introduced.The principle and structure of the work were introduced.In view of the faults in actual use, corresponding improvement design measures were adopted and verified by tests, the design points and details of this kind of lock maker were put forward.
2018, 45(8):50-55.
Abstract:
In order to calculate and evaluate the performance of the motors accurately and quickly, an analytical approach for determining noload airgap flux density of permanent magnet motors considering multi factors based on the I type rotor structure was proposed. A prototype of 48slot 8pole permanent magnet motors was simulated, and the good agreement between the calculated data and the simulated data verified the validity of the proposed analytical approach. The influence of parameters such as permanent magnet size, height of isolation bridge and pole arc coefficient on air gap flux density was analyzed, which provided a way to optimize the motors scheme.
In order to calculate and evaluate the performance of the motors accurately and quickly, an analytical approach for determining noload airgap flux density of permanent magnet motors considering multi factors based on the I type rotor structure was proposed. A prototype of 48slot 8pole permanent magnet motors was simulated, and the good agreement between the calculated data and the simulated data verified the validity of the proposed analytical approach. The influence of parameters such as permanent magnet size, height of isolation bridge and pole arc coefficient on air gap flux density was analyzed, which provided a way to optimize the motors scheme.
2018, 45(8):56-62.
Abstract:
Magnetic planetary gear (MPG) and coaxial magnetic gear (CMG) were the two types of magnetic gears with different topologies and operating principle. By using quantitative design method and finiteelement method the torque performance of the MPG and the CMG, which with the same effective volume and the amount of permanent magnets, were compared. The results revealed that the MPG possess a higher torque density and lower torque ripple. Furthermore, considering the MPG had more flexible operation mode and could realize power split, which made MPG an interesting candidate in hybrid electric vehicles, a prototype of MPG was fabricated and tested. Both theoretical analysis and experimental results verified the effectiveness of this topology.
Magnetic planetary gear (MPG) and coaxial magnetic gear (CMG) were the two types of magnetic gears with different topologies and operating principle. By using quantitative design method and finiteelement method the torque performance of the MPG and the CMG, which with the same effective volume and the amount of permanent magnets, were compared. The results revealed that the MPG possess a higher torque density and lower torque ripple. Furthermore, considering the MPG had more flexible operation mode and could realize power split, which made MPG an interesting candidate in hybrid electric vehicles, a prototype of MPG was fabricated and tested. Both theoretical analysis and experimental results verified the effectiveness of this topology.
2018, 45(8):63-67.
Abstract:
The linear flux switching permanent magnet (LFSPM) motor were capable for long secondary application due to that both the PMs and armature winding were on the short primary, in addition, the secondary was simple and robust. For this kind of machine, high average thrust force was highly desirable, however, low thrust force ripples were also required. A doublesided Ccore LFSPM (DSSLFSPMC) motor was investigated and improved. After being optimized for optimal thrust force using Maxwell 2D, this machine was improved to suppress the thrust force ripple without the decrease of the average thrust force based on a staggered secondary teeth structure and two end PMs. The analysis results showed that the improved DSSLFSPMC machine exhibits relatively low normal force and high thrust force as well as low thrust ripple, indicating that they were suitable for longstroke applications.
The linear flux switching permanent magnet (LFSPM) motor were capable for long secondary application due to that both the PMs and armature winding were on the short primary, in addition, the secondary was simple and robust. For this kind of machine, high average thrust force was highly desirable, however, low thrust force ripples were also required. A doublesided Ccore LFSPM (DSSLFSPMC) motor was investigated and improved. After being optimized for optimal thrust force using Maxwell 2D, this machine was improved to suppress the thrust force ripple without the decrease of the average thrust force based on a staggered secondary teeth structure and two end PMs. The analysis results showed that the improved DSSLFSPMC machine exhibits relatively low normal force and high thrust force as well as low thrust ripple, indicating that they were suitable for longstroke applications.
2018, 45(8):68-73.
Abstract:
A new dual stator hybrid excitation flux switching (DSHEFS) motor with iron bridges was proposed. The advantages of the hybrid excitation motor were analyzed by building the mathematical model of hybrid excitation machine. And an equivalent magnetic circuit model was developed to summarize the characteristics of DSHEFS machines with or without iron flux bridges, respectively. Based on 2D finite element analysis, the electromagnetic performances of the DSHEFS were evaluated, and the results proved that it could exhibit not only better flux regulation capability but also higher torque.
A new dual stator hybrid excitation flux switching (DSHEFS) motor with iron bridges was proposed. The advantages of the hybrid excitation motor were analyzed by building the mathematical model of hybrid excitation machine. And an equivalent magnetic circuit model was developed to summarize the characteristics of DSHEFS machines with or without iron flux bridges, respectively. Based on 2D finite element analysis, the electromagnetic performances of the DSHEFS were evaluated, and the results proved that it could exhibit not only better flux regulation capability but also higher torque.
2018, 45(8):74-79.
Abstract:
The analytical expression of radial electromagnetic force wave of surface-mounted PMSM was deduced by analytical method and the amplitude, order, frequency of radial electromagnetic force wave were gained based on above analytical expression. The influences of radial airgap flux density harmonic on the radial electromagnetic force wave were analyzed, it proposed that the 3pthorder airgap flux density harmonic could be used to reduce the doublefrequency radial electromagnetic force wave, resulting in lower noise and vibration. The finite element simulated model was established to prove the above method and the correctness of the method was validated.
The analytical expression of radial electromagnetic force wave of surface-mounted PMSM was deduced by analytical method and the amplitude, order, frequency of radial electromagnetic force wave were gained based on above analytical expression. The influences of radial airgap flux density harmonic on the radial electromagnetic force wave were analyzed, it proposed that the 3pthorder airgap flux density harmonic could be used to reduce the doublefrequency radial electromagnetic force wave, resulting in lower noise and vibration. The finite element simulated model was established to prove the above method and the correctness of the method was validated.
2018, 45(8):80-85.
Abstract:
Trimming teeth, Ushaped teeth and flange teeth based on 12slot/10pole flux switching permanent magnet motor (FSPMM) was proposed to reduce effectively cogging torque and torque ripple. The 2D finite element method analyzed and evaluated torque characteristics of different novel teeth from average electromagnetic torque, cogging torque, torque ripple. The results verify that the proposed three novel tooth shapes, especially rotor with Ushaped teeth and rotor with flange teeth, could effectively reduce cogging torque and torque ripple at only slight reduce in the average electromagnetic torque.
Trimming teeth, Ushaped teeth and flange teeth based on 12slot/10pole flux switching permanent magnet motor (FSPMM) was proposed to reduce effectively cogging torque and torque ripple. The 2D finite element method analyzed and evaluated torque characteristics of different novel teeth from average electromagnetic torque, cogging torque, torque ripple. The results verify that the proposed three novel tooth shapes, especially rotor with Ushaped teeth and rotor with flange teeth, could effectively reduce cogging torque and torque ripple at only slight reduce in the average electromagnetic torque.
2018, 45(8):86-90.
Abstract:
In order to solve the problem of imprecise speed adjustment, slow speed response and poor adaptability of electric vehicle permanent magnet brushless motor control, by analyzing the characteristics of wheel motor speed regulating system, the influence of the motor vehicle performance was studied. Based on the simplified mathematical model of permanent magnet brushless dc motor, the control strategy was discussed from the Angle of velocity adjustment. Aimed at fast and stable response of motor speed, the prototype experiment platform of permanent magnet brushless DC motor based on dSPACE was set up. The influence of fuzzy PI control strategy on vehicle performance was discussed. The experimental results showed that the fuzzy PI closedloop control strategy could improve the speed regulation performance of the motor and improve the traveling stability of hub motor electric vehicle with permanent magnet brushless DC motor.
In order to solve the problem of imprecise speed adjustment, slow speed response and poor adaptability of electric vehicle permanent magnet brushless motor control, by analyzing the characteristics of wheel motor speed regulating system, the influence of the motor vehicle performance was studied. Based on the simplified mathematical model of permanent magnet brushless dc motor, the control strategy was discussed from the Angle of velocity adjustment. Aimed at fast and stable response of motor speed, the prototype experiment platform of permanent magnet brushless DC motor based on dSPACE was set up. The influence of fuzzy PI control strategy on vehicle performance was discussed. The experimental results showed that the fuzzy PI closedloop control strategy could improve the speed regulation performance of the motor and improve the traveling stability of hub motor electric vehicle with permanent magnet brushless DC motor.
2018, 45(8):91-97, 109.
Abstract:
As proved, new energy vehicles rely on the compact structure, light weight, high power density and high reliability of motor. Therefore, a new cooling system based on heat pipeair cooling system was designed. Firstly, a motor structure based on heat pipeair cooling system was designed. Then a motor’s finite element model (FEM) of thermal analysis was established and validated feasibly. The temperature field of this new kind of motor was investigated through FEM simulations under the rated power and the peak power. The results showed that the heat pipeair cooling system could effectively control the motor’s temperature rise. Compared with the water cooling system, the heat pipeair cooling system was simple and compact because of no water pump, tank, thermostat and other necessities. Hence, the heat pipeair cooling system fits itself more acceptable to realize the light weight and high power density in new energy vehicles.
As proved, new energy vehicles rely on the compact structure, light weight, high power density and high reliability of motor. Therefore, a new cooling system based on heat pipeair cooling system was designed. Firstly, a motor structure based on heat pipeair cooling system was designed. Then a motor’s finite element model (FEM) of thermal analysis was established and validated feasibly. The temperature field of this new kind of motor was investigated through FEM simulations under the rated power and the peak power. The results showed that the heat pipeair cooling system could effectively control the motor’s temperature rise. Compared with the water cooling system, the heat pipeair cooling system was simple and compact because of no water pump, tank, thermostat and other necessities. Hence, the heat pipeair cooling system fits itself more acceptable to realize the light weight and high power density in new energy vehicles.
17 AnImproved GridConnected Control Strategy of Double PWMDirectDriven PermanentMagnet Wind Turbines
2018, 45(8):98-103, 109.
Abstract:
Based on analyzing the speed loop characteristics of directdriven permanentmagnet synchronous wind turbine, the closedloop transfer function of speed control for the generatorside PWM converter was deduced. As a nonorigin closed loop zero exists in the transfer function, an improved PI control strategy was proposed to eliminate the nonorigin closedloop zero and to enhance dynamic characteristics under disturbances. Meanwhile, the idea was applied to the control of the gridside PWM converter. The simulation results showed that the modified control strategy could reduce the overshoots of the dynamic responses in the generatorside and gridside control systems, quicken dynamic response speed and improve the stability of gridconnected operation for the whole double PWM directdriven permanentmagnet wind power generation system.
Based on analyzing the speed loop characteristics of directdriven permanentmagnet synchronous wind turbine, the closedloop transfer function of speed control for the generatorside PWM converter was deduced. As a nonorigin closed loop zero exists in the transfer function, an improved PI control strategy was proposed to eliminate the nonorigin closedloop zero and to enhance dynamic characteristics under disturbances. Meanwhile, the idea was applied to the control of the gridside PWM converter. The simulation results showed that the modified control strategy could reduce the overshoots of the dynamic responses in the generatorside and gridside control systems, quicken dynamic response speed and improve the stability of gridconnected operation for the whole double PWM directdriven permanentmagnet wind power generation system.
2018, 45(8):104-109.
Abstract:
According to the wind speed and output power historical data of wind turbine, the relationship between the average output power of the wind turbine and the wind speed was subjected to least squares parameter identification, and the relationship between the output power deviation of the wind turbine and the wind speed was obtained based on the above research. The Python probabilistic analysis was used to determine the probability distribution types of each subset of the wind turbine output power deviation, and the characteristic parameters were estimated to obtain the probability density function, furthermore, the probability of confidence interval prediction was performed on the wind turbine output power deviation. Based on the relationship between the average output of the wind turbine and the wind speed and the confidence interval estimation model of the wind turbine output power deviation subset, the confidence interval of the wind turbine output power was predicted according to the wind speed forecast value. The method proposed was tested and verified with the historical record of the actual wind turbine, the confidence interval of the wind turbine output power was predicted according to the wind speed forecast value. The results showed that the wind turbine output power deviation was divided into multiple subsets based on the wind speed, which could improve the accuracy of the confidence interval prediction of the wind turbine output power.
According to the wind speed and output power historical data of wind turbine, the relationship between the average output power of the wind turbine and the wind speed was subjected to least squares parameter identification, and the relationship between the output power deviation of the wind turbine and the wind speed was obtained based on the above research. The Python probabilistic analysis was used to determine the probability distribution types of each subset of the wind turbine output power deviation, and the characteristic parameters were estimated to obtain the probability density function, furthermore, the probability of confidence interval prediction was performed on the wind turbine output power deviation. Based on the relationship between the average output of the wind turbine and the wind speed and the confidence interval estimation model of the wind turbine output power deviation subset, the confidence interval of the wind turbine output power was predicted according to the wind speed forecast value. The method proposed was tested and verified with the historical record of the actual wind turbine, the confidence interval of the wind turbine output power was predicted according to the wind speed forecast value. The results showed that the wind turbine output power deviation was divided into multiple subsets based on the wind speed, which could improve the accuracy of the confidence interval prediction of the wind turbine output power.
2018, 45(8):110-115, 123.
Abstract:
The method to detect phaseloss and phasesequence of quadrant frequency converter was focused on. Lock the phase and obtain the amplitudes of positive and negative phasesequence separately using dual second order generalized integrator PLL (DSOGIPLL). Analyze all possible threephase voltage of grid and compute the corresponding positive and negative amplitudes, combined with calculation of DSOGIPLL in real system, predict the phasesequence and faults happened to power supply. Simulation based on MATLAB/Simulink and experiment in real system showed that the method could make accurate judgment to faults and sequence of grid within 15 ms.
The method to detect phaseloss and phasesequence of quadrant frequency converter was focused on. Lock the phase and obtain the amplitudes of positive and negative phasesequence separately using dual second order generalized integrator PLL (DSOGIPLL). Analyze all possible threephase voltage of grid and compute the corresponding positive and negative amplitudes, combined with calculation of DSOGIPLL in real system, predict the phasesequence and faults happened to power supply. Simulation based on MATLAB/Simulink and experiment in real system showed that the method could make accurate judgment to faults and sequence of grid within 15 ms.
2018, 45(8):116-123.
Abstract:
The Three Gorges 700 MW hydrogenerator was used as an example to establish a model of rotor magnetic pole. The thermal stress was solved by finite element method based on the theory of heat transfer and heat stress. Based on the relative basic assumptions and boundary conditions, the distribution of magnetic heat stress in case of winding interturn shortcircuit was given. On the basis of this calculation, the influence of the change of shortcircuit turns and the change of shortcircuit position on the magnetic heat stress was studied. Many meaningful conclusions have been obtained through computational research. The results lay the foundation for further study of the interturn shortcircuit, and provide some reference for the motor designers and related research work.
The Three Gorges 700 MW hydrogenerator was used as an example to establish a model of rotor magnetic pole. The thermal stress was solved by finite element method based on the theory of heat transfer and heat stress. Based on the relative basic assumptions and boundary conditions, the distribution of magnetic heat stress in case of winding interturn shortcircuit was given. On the basis of this calculation, the influence of the change of shortcircuit turns and the change of shortcircuit position on the magnetic heat stress was studied. Many meaningful conclusions have been obtained through computational research. The results lay the foundation for further study of the interturn shortcircuit, and provide some reference for the motor designers and related research work.
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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.
