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Volume 45,Issue 5,2018 Table of Contents
2018, 45(5):1-7.
Abstract:
In order to verify the advantages of the PMASynRM with wide speed domain, and give full play to the output torque of the PMASynRM in the field weakening operation, a full speed domain control method based on torque prediction control was proposed. A PMASynRM was designed with Ansys, and cosimulated with Simulink. The results showed that the torque prediction control method could make the motor get good dynamic performance in the full speed area, and the PMASynRM still had excellent torque output capability under field weakening control.
In order to verify the advantages of the PMASynRM with wide speed domain, and give full play to the output torque of the PMASynRM in the field weakening operation, a full speed domain control method based on torque prediction control was proposed. A PMASynRM was designed with Ansys, and cosimulated with Simulink. The results showed that the torque prediction control method could make the motor get good dynamic performance in the full speed area, and the PMASynRM still had excellent torque output capability under field weakening control.
2018, 45(5):8-13, 19.
Abstract:
The traditional sliding mode control (SMC) of permanent magnet synchronous motor (PMSM) had buffeting problem, and its robustness to perturbation was poor. In view of this problem, a method of active disturbances rejection control (ADRC) and passive-based control (PBC) for PMSM based on extended state observer (ESO) was proposed. In out speed loop, a adaptive SMC was designed, and the system disturbances were observed for feedforward compensation by using the ESO. In internal current loop, PBC was combined with ADRC to obtain the voltage reference in the dqrotating coordinate system. The new control method could effectively suppress the system buffeting and enhance the robustness of the system. The experimental results verified the effectiveness and practicability of the proposed method.
The traditional sliding mode control (SMC) of permanent magnet synchronous motor (PMSM) had buffeting problem, and its robustness to perturbation was poor. In view of this problem, a method of active disturbances rejection control (ADRC) and passive-based control (PBC) for PMSM based on extended state observer (ESO) was proposed. In out speed loop, a adaptive SMC was designed, and the system disturbances were observed for feedforward compensation by using the ESO. In internal current loop, PBC was combined with ADRC to obtain the voltage reference in the dqrotating coordinate system. The new control method could effectively suppress the system buffeting and enhance the robustness of the system. The experimental results verified the effectiveness and practicability of the proposed method.
2018, 45(5):14-19.
Abstract:
For double statorssingle rotor electromagnetic brake, two kinds of magnetic circuit structures were researched. With the threedimensional solver of Maxwell software, the electromagnetic brake of two magnetic circuit structures was simulated by the finite element method, and its feasibility was verified. Under the comparison of the electromagnetic brake of two magnetic circuit structures, the rotor eddy currents, braking torque and braking torque responses for different exciting currents, different rotor materials and different air gap length were obtained, and the results showed that the first magnetic circuit’s braking characteristic was superior to the second one for double statorssingle rotor electromagnetic brake.
For double statorssingle rotor electromagnetic brake, two kinds of magnetic circuit structures were researched. With the threedimensional solver of Maxwell software, the electromagnetic brake of two magnetic circuit structures was simulated by the finite element method, and its feasibility was verified. Under the comparison of the electromagnetic brake of two magnetic circuit structures, the rotor eddy currents, braking torque and braking torque responses for different exciting currents, different rotor materials and different air gap length were obtained, and the results showed that the first magnetic circuit’s braking characteristic was superior to the second one for double statorssingle rotor electromagnetic brake.
2018, 45(5):20-24, 41.
Abstract:
According to the different characteristics of the DC bus current of the inverter when the motor was running in loading or braking, the operation state of the motor was monitored in real time by collecting the DC bus current of the inverter, and a bidirectional DC/DC converter mode switching and controller on-off control circuit was designed to realize the online dynamic control of the energy storage unit. A 550 W energy storage system experimental platform was built and the rationality of the designed state identification and control circuit was verified.
According to the different characteristics of the DC bus current of the inverter when the motor was running in loading or braking, the operation state of the motor was monitored in real time by collecting the DC bus current of the inverter, and a bidirectional DC/DC converter mode switching and controller on-off control circuit was designed to realize the online dynamic control of the energy storage unit. A 550 W energy storage system experimental platform was built and the rationality of the designed state identification and control circuit was verified.
2018, 45(5):25-30.
Abstract:
A motor drive system based on GaN-HEMT paralleling was proposed for an unmanned aerial vehicle. The characters of GaN-HEMT were described in details. The main circuit, drive circuit and digital control system were designed. A prototype was established and experiments were carried out.
A motor drive system based on GaN-HEMT paralleling was proposed for an unmanned aerial vehicle. The characters of GaN-HEMT were described in details. The main circuit, drive circuit and digital control system were designed. A prototype was established and experiments were carried out.
2018, 45(5):31-34, 66.
Abstract:
focusing on its time varying of parameters and nonlinear characteristics a Squirrel induction motor control strategy based on ARX model and model reference adaptive theory was proposed. The proposed control strategy had better robustness for the motor parameters time varying and system interference. The proposed control strategy was verified by the simulation and prototype experiment results.
focusing on its time varying of parameters and nonlinear characteristics a Squirrel induction motor control strategy based on ARX model and model reference adaptive theory was proposed. The proposed control strategy had better robustness for the motor parameters time varying and system interference. The proposed control strategy was verified by the simulation and prototype experiment results.
2018, 45(5):35-41.
Abstract:
The electromagnetic transient process under the grid voltage swell was analyzed by Laplace transform. The stator current contained not only the DC component but also the AC component. The results of simulations spectrum verified the correctness of the theoretical analysis. Different from the conventional research only on the rotor voltage equation considering the dynamic changes of stator flux, while ignoring the influence of the outer power, the stator flux dynamic changes of active and reactive power decoupling effect was analyzed. The improved control strategy considering the influence of stator flux linkage dynamics on the power output loop was proposed. And then, the requirement of reactive current support for unit considering the grid specifications, the grid side converter was controlled to output reactive current, which matches the surge margin and grid voltage quickly recovery. The simulation results showed that the proposed control scheme was capable of not only ensuring continuous operation of the DFIG system during the grid voltage swelling conditions, but also satisfying reactive current output requirement, which achieves the high voltage ride through.
The electromagnetic transient process under the grid voltage swell was analyzed by Laplace transform. The stator current contained not only the DC component but also the AC component. The results of simulations spectrum verified the correctness of the theoretical analysis. Different from the conventional research only on the rotor voltage equation considering the dynamic changes of stator flux, while ignoring the influence of the outer power, the stator flux dynamic changes of active and reactive power decoupling effect was analyzed. The improved control strategy considering the influence of stator flux linkage dynamics on the power output loop was proposed. And then, the requirement of reactive current support for unit considering the grid specifications, the grid side converter was controlled to output reactive current, which matches the surge margin and grid voltage quickly recovery. The simulation results showed that the proposed control scheme was capable of not only ensuring continuous operation of the DFIG system during the grid voltage swelling conditions, but also satisfying reactive current output requirement, which achieves the high voltage ride through.
HE Liang
,
LI Hongwei
,
WANG Jingsong
,
LIU Liu
,
MAO Xiang
,
LI Yujiao
,
GAO Dapeng
,
XIE Feng
,
LIU Tangsheng
2018, 45(5):42-45.
Abstract:
Since the power system was varying from DC 750 to 1 250 V, a power conversion system was designed to solve the power supply to a 660 V AC three-phase pump motor. In the system, a two-level frequency conversion inverter was adopted which was based on space vector pulse width modulation and V/F control. During the research, a key technology was developed which focuses on the DC input, varying in a wide range, converting into the AC output and the solution was proposed. This solution was verified by load experiments and proved to be effective and reliable.
Since the power system was varying from DC 750 to 1 250 V, a power conversion system was designed to solve the power supply to a 660 V AC three-phase pump motor. In the system, a two-level frequency conversion inverter was adopted which was based on space vector pulse width modulation and V/F control. During the research, a key technology was developed which focuses on the DC input, varying in a wide range, converting into the AC output and the solution was proposed. This solution was verified by load experiments and proved to be effective and reliable.
2018, 45(5):46-51, 63.
Abstract:
The unbalanced capacitor voltage of three-phase four-switch converter reduces the grid-connected power quality and lifetime of the electrolytic capacitor. In order to balance the DC-link capacitor voltage, a model predictive power control strategy was proposed. Based on the analysis of the voltage vector in the αβtwo-phase stationary coordinate system, the power predictive model was established. As the DC-link midpoint voltage deviation contains the AC component and DC component, low-pass filter was used to extract the DC component to calculate the power compensation value. Then, the power compensation value was added to the reference power, the cost function to select the optimal voltage vector to achieve grid-connected power control and the capacitor voltage banlance was used. The control strategy does not require phase-locked loop or PWM modulation, and was easy to implement. The dynamic and static characteristics were analyzed by simulation and experiment, and the feasibility of the proposed control strategy were verified.
The unbalanced capacitor voltage of three-phase four-switch converter reduces the grid-connected power quality and lifetime of the electrolytic capacitor. In order to balance the DC-link capacitor voltage, a model predictive power control strategy was proposed. Based on the analysis of the voltage vector in the αβtwo-phase stationary coordinate system, the power predictive model was established. As the DC-link midpoint voltage deviation contains the AC component and DC component, low-pass filter was used to extract the DC component to calculate the power compensation value. Then, the power compensation value was added to the reference power, the cost function to select the optimal voltage vector to achieve grid-connected power control and the capacitor voltage banlance was used. The control strategy does not require phase-locked loop or PWM modulation, and was easy to implement. The dynamic and static characteristics were analyzed by simulation and experiment, and the feasibility of the proposed control strategy were verified.
2018, 45(5):52-57.
Abstract:
Taking a rated power of 60 kW PMSM as the research object, the air gap equivalent thermal conductivity coefficient was used to deal with the heat exchange between the stator and rotor. The equivalent thermal model of the stator windings was given. Considering temperature effect on stator winding resistance in winding copper loss calculation, the thermal resistance between the housing and the stator core due to the assembly gap was test. On this basis, the finite element model of 3D global transient temperature field of PMSM was established, and the temperature field of motor at peak speed was calculated and verified by experiment. The optimization of channel width ratio, channel number and fin was carried out to find out the optimal solution. The results showed that the maximum temperature of the motor was decreased by 9.8 ℃ after the channel was optimized, which had a certain guiding significance for the structural design of the motor channel.
Taking a rated power of 60 kW PMSM as the research object, the air gap equivalent thermal conductivity coefficient was used to deal with the heat exchange between the stator and rotor. The equivalent thermal model of the stator windings was given. Considering temperature effect on stator winding resistance in winding copper loss calculation, the thermal resistance between the housing and the stator core due to the assembly gap was test. On this basis, the finite element model of 3D global transient temperature field of PMSM was established, and the temperature field of motor at peak speed was calculated and verified by experiment. The optimization of channel width ratio, channel number and fin was carried out to find out the optimal solution. The results showed that the maximum temperature of the motor was decreased by 9.8 ℃ after the channel was optimized, which had a certain guiding significance for the structural design of the motor channel.
11 Fault Tolerant Analysis of Sensorless for Switched Reluctance MotorBased on the Current Threshold
2018, 45(5):58-63.
Abstract:
A position estimation fault tolerant technology for switched reluctance motor (SRM) was proposed under the condition of the sensor fault and estimation error compensation based on the double current thresholds. In this method, the position index pulses were estimated by comparing the double current threshold value and the pulse current amplitude, and the speed and position could also be estimated by the position index pulses signals. Uing the independence of the SRM between the phase and the phase, the positions of the sensor fault phase were estimated using the electromagnetic information of the normal phase. The influence of the speed on position estimation error was obtained by simulation, and put forward the position error compensation measures. The experiment was carried out in a 12/8 structure prototype, the experimental results showed that the method could improve the fault tolerance of the sensorless sensor technology, and verify the correctness and feasibility of the algorithm.
A position estimation fault tolerant technology for switched reluctance motor (SRM) was proposed under the condition of the sensor fault and estimation error compensation based on the double current thresholds. In this method, the position index pulses were estimated by comparing the double current threshold value and the pulse current amplitude, and the speed and position could also be estimated by the position index pulses signals. Uing the independence of the SRM between the phase and the phase, the positions of the sensor fault phase were estimated using the electromagnetic information of the normal phase. The influence of the speed on position estimation error was obtained by simulation, and put forward the position error compensation measures. The experiment was carried out in a 12/8 structure prototype, the experimental results showed that the method could improve the fault tolerance of the sensorless sensor technology, and verify the correctness and feasibility of the algorithm.
DING Binbin
,
TANG Huiming
,
HUANG Jian
,
CHENG Guodong
,
GUAN Yang
,
WANG Yue
,
CHEN Li
,
TAN Weihong
2018, 45(5):64-66.
Abstract:
The application of high voltage motor was introduced, mould improvement and new cast aluminum casting were processed. By application example for high efficiency motor, the technology resolves effectively successful application of middle and small motors was resolved. It was an alternative technology for manufacturing the rotor sheet in low voltage high efficiency motor.
The application of high voltage motor was introduced, mould improvement and new cast aluminum casting were processed. By application example for high efficiency motor, the technology resolves effectively successful application of middle and small motors was resolved. It was an alternative technology for manufacturing the rotor sheet in low voltage high efficiency motor.
2018, 45(5):67-71, 91.
Abstract:
Based on MATLAB/Simulink a new parameter varying equivalent magnet network method was presented for a double-layer high density IPMSM. It took full consideration of leakage flux of rotor and automatically adjusted the magnetic permeability of each part through a parameter varying segment. Core saturation was taken into account so that the calculation accuracy of parameter varying equivalent magnet network method was greatly promoted. With this network method, the effects of rotor parameters to motor no-load electromagnetic performance and the air gap flux density waveform were analyzed. A fast and efficient way for original design of the high density IPMSM was proposed by the equivalent magnetic network method.
Based on MATLAB/Simulink a new parameter varying equivalent magnet network method was presented for a double-layer high density IPMSM. It took full consideration of leakage flux of rotor and automatically adjusted the magnetic permeability of each part through a parameter varying segment. Core saturation was taken into account so that the calculation accuracy of parameter varying equivalent magnet network method was greatly promoted. With this network method, the effects of rotor parameters to motor no-load electromagnetic performance and the air gap flux density waveform were analyzed. A fast and efficient way for original design of the high density IPMSM was proposed by the equivalent magnetic network method.
2018, 45(5):72-76.
Abstract:
A fullorder observer with speed selfadapting rule of induction motor was presented. A strategy of restarting at unknown speed based on Popov stability theory was proposed. In the proposed strategy, the error between estimated speed and real speed was reflected. In order to make the estimated speed follow real speed rapidly, a method searching from middle of max motor speed to two sides was used. In addition, a method of preexcitation was used to decrease current impact during restart the motor at unknown speed. The correctness and effectiveness of the proposed strategy were proved by simulation results.
A fullorder observer with speed selfadapting rule of induction motor was presented. A strategy of restarting at unknown speed based on Popov stability theory was proposed. In the proposed strategy, the error between estimated speed and real speed was reflected. In order to make the estimated speed follow real speed rapidly, a method searching from middle of max motor speed to two sides was used. In addition, a method of preexcitation was used to decrease current impact during restart the motor at unknown speed. The correctness and effectiveness of the proposed strategy were proved by simulation results.
2018, 45(5):77-82, 87.
Abstract:
The maximum point of the motor at given speed was found by a quantitative analysis of both the voltage limit vector circle and the current limit vector circle. The maximum torque point was corrected by compensating stater resistance voltage at the voltage limit vector. Through the direct given crossaxis voltage to take full advantage of this point of electromagnetic torque, the motor load capacity and antijamming capability were improved. The simulation proved that the algorithm had been well designed in terms of validity and feasibility. The model has a good portability by the quantitative analysis of the maximum torque point.
The maximum point of the motor at given speed was found by a quantitative analysis of both the voltage limit vector circle and the current limit vector circle. The maximum torque point was corrected by compensating stater resistance voltage at the voltage limit vector. Through the direct given crossaxis voltage to take full advantage of this point of electromagnetic torque, the motor load capacity and antijamming capability were improved. The simulation proved that the algorithm had been well designed in terms of validity and feasibility. The model has a good portability by the quantitative analysis of the maximum torque point.
2018, 45(5):83-87.
Abstract:
A remote operation and maintenance system of intelligent motor manufacturing based on cloud platform was designed to meet the requirements of remote operation and maintenance of intelligent manufacturing of motor devices. The system architecture, information architecture and experimental verification platform of remote operation and maintenance system were described in detail. The remote operation and maintenance system could collect motor parameter information in the process of motor manufacturing and field application, and realize the operation and maintenance management of the whole life cycle of the motor. The application of the platform will help enterprises improve the quality of motor production, reduce motor operation and maintenance costs, speed up the response of motor operation and maintenance services, improve aftersales service level, and improve the level of intelligent manufacturing of motor devices.
A remote operation and maintenance system of intelligent motor manufacturing based on cloud platform was designed to meet the requirements of remote operation and maintenance of intelligent manufacturing of motor devices. The system architecture, information architecture and experimental verification platform of remote operation and maintenance system were described in detail. The remote operation and maintenance system could collect motor parameter information in the process of motor manufacturing and field application, and realize the operation and maintenance management of the whole life cycle of the motor. The application of the platform will help enterprises improve the quality of motor production, reduce motor operation and maintenance costs, speed up the response of motor operation and maintenance services, improve aftersales service level, and improve the level of intelligent manufacturing of motor devices.
2018, 45(5):88-91.
Abstract:
In the series design of low speed high torque motor, the water cooled frame structure of axial water was adopted, considering the universality and the specification of the size of the frame. Through the calculation of the fluid field of the motor cooling system, the heat dissipation parameters of the motor were obtained. The temperature rise of the cooling water and the frame of the motor was obtained. The natural vibration frequency of the motor was obtained through the vibration mode analysis of the frame.
In the series design of low speed high torque motor, the water cooled frame structure of axial water was adopted, considering the universality and the specification of the size of the frame. Through the calculation of the fluid field of the motor cooling system, the heat dissipation parameters of the motor were obtained. The temperature rise of the cooling water and the frame of the motor was obtained. The natural vibration frequency of the motor was obtained through the vibration mode analysis of the frame.
2018, 45(5):92-96, 119.
Abstract:
The external enclosed large threephase wound asynchronous motor slip ring, brush holder, the design of the ventilation structure were mainly introduces. The structure of the cooling system were design, and the key point in design was pointed out. The enclosed large threephase wound asynchronous motor collector ring each slip ring temperature uniformity, collector ring design and actual test results anastomotic theory were verified. The enclosed collector ring carbon powder collection device was practical and motor the feasibility of local structure.
The external enclosed large threephase wound asynchronous motor slip ring, brush holder, the design of the ventilation structure were mainly introduces. The structure of the cooling system were design, and the key point in design was pointed out. The enclosed large threephase wound asynchronous motor collector ring each slip ring temperature uniformity, collector ring design and actual test results anastomotic theory were verified. The enclosed collector ring carbon powder collection device was practical and motor the feasibility of local structure.
2018, 45(5):97-99, 114.
Abstract:
A grinding machine with empty cold wound asynchronous motor electromagnetic scheme, the ventilation and heat dissipation structure, and the structure of rotor lead were introduced. Combined with the test data validate the motor electromagnetic scheme, the ventilation and heat dissipation structure, and the rotor lead the rationality of the structure were designed. A larger capacity empty cold wound asynchronous motor provided guiding thought and important to the success of practical experience for the future.
A grinding machine with empty cold wound asynchronous motor electromagnetic scheme, the ventilation and heat dissipation structure, and the structure of rotor lead were introduced. Combined with the test data validate the motor electromagnetic scheme, the ventilation and heat dissipation structure, and the rotor lead the rationality of the structure were designed. A larger capacity empty cold wound asynchronous motor provided guiding thought and important to the success of practical experience for the future.
2018, 45(5):100-104, 110.
Abstract:
Based on support vector machine and DS evidence theory the multiinformation fault diagnosis with the extended Park’s vector model and the residual voltage afler switchoff model were made. The simulation experimental results showed that the proposed method could effectively improve the accuracy of fault diagnosis in doublefed induction generator.
Based on support vector machine and DS evidence theory the multiinformation fault diagnosis with the extended Park’s vector model and the residual voltage afler switchoff model were made. The simulation experimental results showed that the proposed method could effectively improve the accuracy of fault diagnosis in doublefed induction generator.
2018, 45(5):105-110.
Abstract:
A semi physical simulation system for fault prediction of wind turbines was designed. The electric signals of the system were used for the prediction. Based on MATLAB simulation and examples of real data processing, the working principle, hardware structure and software design method of the system were described. The feasibility and effectiveness of the Fast Fourier transform, wavelet transform and other traditional and new methods on nonstationary electric power data processing for fault prediction were studied, with wind turbines operating under the condition of uncontrollable natural winds. The results proved that the system was a significant method of studying fault prediction, while it was difficult to obtain the data of wind turbines.
A semi physical simulation system for fault prediction of wind turbines was designed. The electric signals of the system were used for the prediction. Based on MATLAB simulation and examples of real data processing, the working principle, hardware structure and software design method of the system were described. The feasibility and effectiveness of the Fast Fourier transform, wavelet transform and other traditional and new methods on nonstationary electric power data processing for fault prediction were studied, with wind turbines operating under the condition of uncontrollable natural winds. The results proved that the system was a significant method of studying fault prediction, while it was difficult to obtain the data of wind turbines.
2018, 45(5):111-114.
Abstract:
The damage of shaft voltage to motor bearing had caused many electrical erosion accidents at home and abroad, and caused serious equipment damage and economic loss of ship owners. Through the research of shaft voltage problem of marine motor with different parameter types, the causing reason and the method of shaft voltage test were introduced, the shaft voltage of different type bearing motor were measured, a practical method for preventing shaft voltage was given. It could reduce and avoid the navigation damage caused by the shaft voltage.
The damage of shaft voltage to motor bearing had caused many electrical erosion accidents at home and abroad, and caused serious equipment damage and economic loss of ship owners. Through the research of shaft voltage problem of marine motor with different parameter types, the causing reason and the method of shaft voltage test were introduced, the shaft voltage of different type bearing motor were measured, a practical method for preventing shaft voltage was given. It could reduce and avoid the navigation damage caused by the shaft voltage.
2018, 45(5):115-119.
Abstract:
IE4 super premium efficiency IEC60034-30-1:2014 issued by IEC the highest efficiency level of the motor in the standard. The B method was used to measure the input and output power loss analysis method to test the large loss of the YE4 series (IP55) three phase asynchronous motor, and to verify the effect of different consumption design measures. Thus, the whole series motor had reached the level of IE4 efficiency level. The successful development and application of YE4 products would made an important contribution to further promoting the implementation of China’s energy saving and emission reduction policies.
IE4 super premium efficiency IEC60034-30-1:2014 issued by IEC the highest efficiency level of the motor in the standard. The B method was used to measure the input and output power loss analysis method to test the large loss of the YE4 series (IP55) three phase asynchronous motor, and to verify the effect of different consumption design measures. Thus, the whole series motor had reached the level of IE4 efficiency level. The successful development and application of YE4 products would made an important contribution to further promoting the implementation of China’s energy saving and emission reduction policies.
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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.
