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Volume 47,Issue 5,2020 Table of Contents
2020, 47(5):1-6.
DOI: 10.12177/emca.2020.009
Abstract:
To address the resonance issue of flexible loads driven by permanent magnet synchronous motors (PMSMs) in electric vehicles, the resonance suppression scheme based on speed feedback incremental compensation is adopted. Firstly, a high pass filter is utilized to effectively determine the resonance frequency point in the speed response. Then, for increasing the coefficient associated with vertical component in the electromagnetic torque and the damping coefficient in the system, the electromagnetic torque can be reasonably regulated by the negative feedback compensation according to the torque increment at the resonance frequency point. Thus, both the system stability and resonance suppression can be ensured. Following this, a speed feedback coefficient is introduced, which aims to increase the degree of freedom of the poles and even further improve the control performance. Finally, the feasibility of the method is validated by simulation.
To address the resonance issue of flexible loads driven by permanent magnet synchronous motors (PMSMs) in electric vehicles, the resonance suppression scheme based on speed feedback incremental compensation is adopted. Firstly, a high pass filter is utilized to effectively determine the resonance frequency point in the speed response. Then, for increasing the coefficient associated with vertical component in the electromagnetic torque and the damping coefficient in the system, the electromagnetic torque can be reasonably regulated by the negative feedback compensation according to the torque increment at the resonance frequency point. Thus, both the system stability and resonance suppression can be ensured. Following this, a speed feedback coefficient is introduced, which aims to increase the degree of freedom of the poles and even further improve the control performance. Finally, the feasibility of the method is validated by simulation.
2 Adaptive Control of Electrically Excited Linear Synchronous Motor Based on Lyapunov Stability Theory
2020, 47(5):7-17.
DOI: 10.12177/emca.2020.002
Abstract:
In order to improve the dynamic performance of linear servo system and overcome the time varying problem of linear synchronous motor parameters, a model reference adaptive speed controller is designed. The inner loop of the system is a speed tracking controller based on the reference model. The outer loop adaptive mechanism adjusts the adjustable parameters of the speed tracking controller online and makes the generalized speed error between the output speed of the reference model and that of the control object approach zero. The design method of model reference adaptive speed controller based on Lyapunov stability theory is adopted. The generalized speed tracking error converges to zero, and the model reference adaptive speed control system has stability and convergence. Using Euler numerical integration method, the output speed curves of the reference model and the control object and the time domain response curve of the primary quadrature current state variable are obtained through computer numerical simulation. The global convergence of the adaptive speed control system is verified.
In order to improve the dynamic performance of linear servo system and overcome the time varying problem of linear synchronous motor parameters, a model reference adaptive speed controller is designed. The inner loop of the system is a speed tracking controller based on the reference model. The outer loop adaptive mechanism adjusts the adjustable parameters of the speed tracking controller online and makes the generalized speed error between the output speed of the reference model and that of the control object approach zero. The design method of model reference adaptive speed controller based on Lyapunov stability theory is adopted. The generalized speed tracking error converges to zero, and the model reference adaptive speed control system has stability and convergence. Using Euler numerical integration method, the output speed curves of the reference model and the control object and the time domain response curve of the primary quadrature current state variable are obtained through computer numerical simulation. The global convergence of the adaptive speed control system is verified.
2020, 47(5):18-21.
DOI: 10.12177/emca.2020.018
Abstract:
In order to improve the dynamic quality of permanent magnet synchronous motor (PMSM) speed regulation system, a novel sliding mode speed control algorithm based on variable exponential reaching law is proposed. Based on conventional exponential reaching law, variable exponential function and hyperbolic tangent function are introduced to improve the system adaptive adjustment ability of sliding mode approaching speed and suppress chattering effectively. Based on the novel variable exponential reaching law, the sliding mode speed controller of PMSM is designed. Simulation results show that, compared with conventional sliding mode speed controller and PI controller, the novel sliding mode speed controller can effectively improve speed tracking accuracy and anti disturbance capability.
In order to improve the dynamic quality of permanent magnet synchronous motor (PMSM) speed regulation system, a novel sliding mode speed control algorithm based on variable exponential reaching law is proposed. Based on conventional exponential reaching law, variable exponential function and hyperbolic tangent function are introduced to improve the system adaptive adjustment ability of sliding mode approaching speed and suppress chattering effectively. Based on the novel variable exponential reaching law, the sliding mode speed controller of PMSM is designed. Simulation results show that, compared with conventional sliding mode speed controller and PI controller, the novel sliding mode speed controller can effectively improve speed tracking accuracy and anti disturbance capability.
2020, 47(5):22-27.
DOI: 10.12177/emca.2020.013
Abstract:
Aiming at the problem of torque ripple caused by large errors of flux linkage and torque observer in direct torque control (DTC) of permanent magnet synchronous motor (PMSM), a flux linkage and torque observer based on spatial analytical model is proposed and applied to DTC based on space vector pulse width modulation (SVPWM). Numerical solutions of the flux linkage and torque are obtained through finite element simulation, with which a flux linkage and torque spatial analytical model considering the space harmonics and magnetic saturation characteristics of the motor is derived. Based on these, a new type of high-precision flux linkage and torque observer is constructed. Simulation and experimental results show that the observers based on the spatial analytical model can effectively suppress torque ripple of SVPWM-DTC caused by observation errors.
Aiming at the problem of torque ripple caused by large errors of flux linkage and torque observer in direct torque control (DTC) of permanent magnet synchronous motor (PMSM), a flux linkage and torque observer based on spatial analytical model is proposed and applied to DTC based on space vector pulse width modulation (SVPWM). Numerical solutions of the flux linkage and torque are obtained through finite element simulation, with which a flux linkage and torque spatial analytical model considering the space harmonics and magnetic saturation characteristics of the motor is derived. Based on these, a new type of high-precision flux linkage and torque observer is constructed. Simulation and experimental results show that the observers based on the spatial analytical model can effectively suppress torque ripple of SVPWM-DTC caused by observation errors.
2020, 47(5):28-32.
DOI: 10.12177/emca.2020.010
Abstract:
For the reliability of the electric power steering system of the automobile steering wheel, the fault-tolerant control strategy based on the dual three-phase permanent magnet synchronous motors (PMSMs) under open winding faults is studied. A one-phase open winding is used as an example. By deducing the coordinate transformation matrix when the motor winding is open, a mathematical model of dual three-phase PMSMs under fault in the d-q axis coordinate system is established. Based on the decoupling transformation of the motor voltage equation, a current regulator architecture with feedforward compensation is designed, and a fault-tolerant control strategy with the minimum total loss of the stator is studied. The simulation results confirm that the control strategy can improve the performance of the dual three-phase PMSMs under phase loss fault conditions.
For the reliability of the electric power steering system of the automobile steering wheel, the fault-tolerant control strategy based on the dual three-phase permanent magnet synchronous motors (PMSMs) under open winding faults is studied. A one-phase open winding is used as an example. By deducing the coordinate transformation matrix when the motor winding is open, a mathematical model of dual three-phase PMSMs under fault in the d-q axis coordinate system is established. Based on the decoupling transformation of the motor voltage equation, a current regulator architecture with feedforward compensation is designed, and a fault-tolerant control strategy with the minimum total loss of the stator is studied. The simulation results confirm that the control strategy can improve the performance of the dual three-phase PMSMs under phase loss fault conditions.
2020, 47(5):33-38.
DOI: 10.12177/emca.2020.014
Abstract:
The marine permanent magnet synchronous motor (PMSM) is susceptible to torque disturbances when it is operated in a complex marine environment, which leads to a poor control performance. This phenomenon is more obvious when the PMSM is running at low and medium speed. In order to solve this problem, a vector control strategy of PMSM based on torque disturbance observer and repetitive control is proposed. A torque disturbance observer based on the rotor position is designed, which is used to estimate the torque of PMSM. Combining the torque disturbance observer with the theoretical thought of repetitive control, the error caused by the torque disturbance can be compensated periodically and reduced. Through MATLAB/Simulink simulation and experiments, it is proved that the strategy has the advantages of strong anti torque disturbance capability and good speed dynamic control performance.
The marine permanent magnet synchronous motor (PMSM) is susceptible to torque disturbances when it is operated in a complex marine environment, which leads to a poor control performance. This phenomenon is more obvious when the PMSM is running at low and medium speed. In order to solve this problem, a vector control strategy of PMSM based on torque disturbance observer and repetitive control is proposed. A torque disturbance observer based on the rotor position is designed, which is used to estimate the torque of PMSM. Combining the torque disturbance observer with the theoretical thought of repetitive control, the error caused by the torque disturbance can be compensated periodically and reduced. Through MATLAB/Simulink simulation and experiments, it is proved that the strategy has the advantages of strong anti torque disturbance capability and good speed dynamic control performance.
2020, 47(5):39-46.
DOI: 10.12177/emca.2020.025
Abstract:
According to the authors' statement about the presence of unsolvable problem(s) , this paper has been retracted since March 24, 2021.
According to the authors' statement about the presence of unsolvable problem(s) , this paper has been retracted since March 24, 2021.
2020, 47(5):47-52.
DOI: 10.12177/emca.2020.021
Abstract:
Due to the insufficient current withstanding capacity, the grid-connection converter of the new energy unit is easy to cause large-scale off grid in case of grid failure, which will lower the low voltage ride-through (LVRT) capability of the new energy system and endanger the stable operation of the power system. A motor-generator pair (MGP) system is proposed to improve the LVRT capability of the new energy generation system. Firstly, the mathematical model and control method of the MGP system are given. Then the fault isolation mechanism is analyzed from the mechanical motion equation, and the regulation mechanism of the DC voltage feedback control in the process of voltage drop is illustrated in detail. Taking the photovoltaic (PV) generation system as an example, the simulation model is built to verify the LVRT capability and reactive power support by adopting the MGP system. Finally, experimental validation on the LVRT effect is performed, and the results show that the MGP system can effectively improve the LVRT capability of PV inverter with DC voltage feedback control.
Due to the insufficient current withstanding capacity, the grid-connection converter of the new energy unit is easy to cause large-scale off grid in case of grid failure, which will lower the low voltage ride-through (LVRT) capability of the new energy system and endanger the stable operation of the power system. A motor-generator pair (MGP) system is proposed to improve the LVRT capability of the new energy generation system. Firstly, the mathematical model and control method of the MGP system are given. Then the fault isolation mechanism is analyzed from the mechanical motion equation, and the regulation mechanism of the DC voltage feedback control in the process of voltage drop is illustrated in detail. Taking the photovoltaic (PV) generation system as an example, the simulation model is built to verify the LVRT capability and reactive power support by adopting the MGP system. Finally, experimental validation on the LVRT effect is performed, and the results show that the MGP system can effectively improve the LVRT capability of PV inverter with DC voltage feedback control.
QIN Xin
,
AN Yuejun
,
ZHANG Zhiheng
,
YANG Weiguo
,
LUAN Xiaoying
,
QIAN Yunde
,
DENG Wenyu
,
QI Lijun
2020, 47(5):53-59.
DOI: 10.12177/emca.2020.017
Abstract:
The canned motor for chemical pump is the main power source of chemical pump. It has the advantages of reliable operation and no medium leakage. It is very important to analyze its operating performance and multiphysics distribution. A new composite squirrel cage structure is designed for the canned motor for chemical pump. The size is determined by the commercial field-circuit coupling time-step finite element software, and its driving performance is analyzed. Based on the idea of fluid-solid coupling, the three-dimensional temperature field and stress field distribution of the new composite squirrel cage structure and the conventional pure copper squirrel cage motor are compared and analyzed. Through experiments and analytical calculations, the new canned motor for chemical pump designed is verified. The composite squirrel cage structure and the motor scheme are reasonable and feasible. On the premise of ensuring the energy index, the starting torque multiple is increased by 2.1%, the starting current multiple is reduced by 2.6%, and the winding end temperature is reduced by 3.18 ℃. In addition, the weight and cost of the motor are reduced.
The canned motor for chemical pump is the main power source of chemical pump. It has the advantages of reliable operation and no medium leakage. It is very important to analyze its operating performance and multiphysics distribution. A new composite squirrel cage structure is designed for the canned motor for chemical pump. The size is determined by the commercial field-circuit coupling time-step finite element software, and its driving performance is analyzed. Based on the idea of fluid-solid coupling, the three-dimensional temperature field and stress field distribution of the new composite squirrel cage structure and the conventional pure copper squirrel cage motor are compared and analyzed. Through experiments and analytical calculations, the new canned motor for chemical pump designed is verified. The composite squirrel cage structure and the motor scheme are reasonable and feasible. On the premise of ensuring the energy index, the starting torque multiple is increased by 2.1%, the starting current multiple is reduced by 2.6%, and the winding end temperature is reduced by 3.18 ℃. In addition, the weight and cost of the motor are reduced.
2020, 47(5):60-63.
DOI: 10.12177/emca.2020.022
Abstract:
To ensure reliable power supply of diesel generator set at all working conditions, especially some extreme conditions, shaft torsional vibration calculation is carried out for the natural frequency, the steady-state basic stress and the additive stress at instantaneous overload condition for a marine diesel generator set the shaft, based on steady-state and instantaneous torsional vibration analysis of the shaft. Comprehensive study on the operational security of diesel generator set shaft at instantaneous overload condition can assure the reliable all-condition power supply.
To ensure reliable power supply of diesel generator set at all working conditions, especially some extreme conditions, shaft torsional vibration calculation is carried out for the natural frequency, the steady-state basic stress and the additive stress at instantaneous overload condition for a marine diesel generator set the shaft, based on steady-state and instantaneous torsional vibration analysis of the shaft. Comprehensive study on the operational security of diesel generator set shaft at instantaneous overload condition can assure the reliable all-condition power supply.
2020, 47(5):64-69.
DOI: 10.12177/emca.2020.015
Abstract:
During the rated operation of canned motor for vacuum dry pump, insulation aging may occur when the temperature rise is too high, which threatens the operation safety of the vacuum dry pump. Aiming at this problem, the water-cooled structure of a 4.5 kW canned motor for vacuum dry pump is designed, and the temperature field simulation analysis and experiment are carried out. A three-dimensional model of the canned motor is established by using mechanical software, and a simulation model for calculating the temperature field of the canned motor is established by using finite element analysis software. By setting the thermal source and boundary conditions, the temperature field distribution in each part of the motor is obtained. An experimental platform is set up to carry put the temperature rise test, and the characteristic curves of temperature changing with time are obtained during the start process in cold condition to stable process after temperature rise. Combined with the temperature field analysis and experimental results, it showes that the internal temperature of the motor meets the thermal design requirements. This research has a certain guiding significance for the subsequent investigation of temperature field and the design of cooling system of the canned motor for vacuum dry pump.
During the rated operation of canned motor for vacuum dry pump, insulation aging may occur when the temperature rise is too high, which threatens the operation safety of the vacuum dry pump. Aiming at this problem, the water-cooled structure of a 4.5 kW canned motor for vacuum dry pump is designed, and the temperature field simulation analysis and experiment are carried out. A three-dimensional model of the canned motor is established by using mechanical software, and a simulation model for calculating the temperature field of the canned motor is established by using finite element analysis software. By setting the thermal source and boundary conditions, the temperature field distribution in each part of the motor is obtained. An experimental platform is set up to carry put the temperature rise test, and the characteristic curves of temperature changing with time are obtained during the start process in cold condition to stable process after temperature rise. Combined with the temperature field analysis and experimental results, it showes that the internal temperature of the motor meets the thermal design requirements. This research has a certain guiding significance for the subsequent investigation of temperature field and the design of cooling system of the canned motor for vacuum dry pump.
2020, 47(5):70-74.
DOI: 10.12177/emca.2020.028
Abstract:
On the premise of ensuring reliability of insulation structure of stator winding, the insulation structure of ordinary winding is optimized by controlling the diameter of enameled wire conductor (negative tolerance) and the eccentricity (≤1.5) and thickness of paint film, and reducing the thickness of slot insulation and slot wedge, so as to improve the full ratio of stator slot and the motor efficiency. Thermal aging experiment is carried out for three insulation structures. The results show that the temperature indices of three insulation structures are all over 160 ℃, reaching 155(F) grade. The optimized insulation structure can help the design and development of high efficiency motor.
On the premise of ensuring reliability of insulation structure of stator winding, the insulation structure of ordinary winding is optimized by controlling the diameter of enameled wire conductor (negative tolerance) and the eccentricity (≤1.5) and thickness of paint film, and reducing the thickness of slot insulation and slot wedge, so as to improve the full ratio of stator slot and the motor efficiency. Thermal aging experiment is carried out for three insulation structures. The results show that the temperature indices of three insulation structures are all over 160 ℃, reaching 155(F) grade. The optimized insulation structure can help the design and development of high efficiency motor.
2020, 47(5):75-79.
DOI: 10.12177/emca.2020.005
Abstract:
Aiming at the quick response and smooth operation of the pan body, blade and dumping action of the drum type cooking machine, a multi-motor cooperative controller with STM32F767IGT6 as the main controller is designed. The controller adopts 74HC244 isolation circuit and dual-BTN7960-chip motor drive circuit to realize motor control, incremental encoder and photocoupler speed measurement circuit to achieve speed feedback, and PID algorithm to achieve speed setting. The experiments show that the multi motor cooperative controller can realize the fast response of the motor. The motors stabilize to the preset speed in 0.04~0.06 s. The pan body, blade, and dumping control motors can achieve synchronous and independent working modes, and the interaction is neglectable. This controller can meet the action needs of the cooking machine.
Aiming at the quick response and smooth operation of the pan body, blade and dumping action of the drum type cooking machine, a multi-motor cooperative controller with STM32F767IGT6 as the main controller is designed. The controller adopts 74HC244 isolation circuit and dual-BTN7960-chip motor drive circuit to realize motor control, incremental encoder and photocoupler speed measurement circuit to achieve speed feedback, and PID algorithm to achieve speed setting. The experiments show that the multi motor cooperative controller can realize the fast response of the motor. The motors stabilize to the preset speed in 0.04~0.06 s. The pan body, blade, and dumping control motors can achieve synchronous and independent working modes, and the interaction is neglectable. This controller can meet the action needs of the cooking machine.
2020, 47(5):80-84.
DOI: 10.12177/emca.2020.026
Abstract:
Traditional sliding mode control is prone to chattering，which affects the stability of the differential control system of electric vehicle driven by in-wheel motor. A new electronic differential controller design method based on synergetic control theory is proposed for the vehicle′s eight-degree-of-freedom dynamic model to solve the chattering phenomenon in the control process. This method takes torque as the control target, and by constructing a generalized variable about the slip ratio, the controller converges exponentially to the optimal slip ratio point. The MATLAB/Simulink simulation results show that the new electronic differential controller has the advantages of fast dynamic response, smoothness, and good steady-state characteristics.
Traditional sliding mode control is prone to chattering，which affects the stability of the differential control system of electric vehicle driven by in-wheel motor. A new electronic differential controller design method based on synergetic control theory is proposed for the vehicle′s eight-degree-of-freedom dynamic model to solve the chattering phenomenon in the control process. This method takes torque as the control target, and by constructing a generalized variable about the slip ratio, the controller converges exponentially to the optimal slip ratio point. The MATLAB/Simulink simulation results show that the new electronic differential controller has the advantages of fast dynamic response, smoothness, and good steady-state characteristics.
2020, 47(5):85-89.
DOI: 10.12177/emca.2020.012
Abstract:
Vehicle operation when the 48 V battery is in abnormal status is analyzed. In order to keep the vehicle to be driven as a traditional car, the integrated belt-driven starter/generator (IBSG) is no longer working in torque control mode, but in voltage control mode in this condition. For studying the influences of IBSG speed change and 12 V load change on the voltage control mode, validation is performed both in bench test and in vehicle test with 1.0 L engine. Results show that IBSG can enter the voltage control mode smoothly. The voltage control mode ensures that the vehicle keeps running when the 48 V battery is not on the DC bus. As a kind of auxiliary driving mode, this control mode enhances the security and robustness of the vehicle.
Vehicle operation when the 48 V battery is in abnormal status is analyzed. In order to keep the vehicle to be driven as a traditional car, the integrated belt-driven starter/generator (IBSG) is no longer working in torque control mode, but in voltage control mode in this condition. For studying the influences of IBSG speed change and 12 V load change on the voltage control mode, validation is performed both in bench test and in vehicle test with 1.0 L engine. Results show that IBSG can enter the voltage control mode smoothly. The voltage control mode ensures that the vehicle keeps running when the 48 V battery is not on the DC bus. As a kind of auxiliary driving mode, this control mode enhances the security and robustness of the vehicle.
2020, 47(5):90-93.
DOI: 10.12177/emca.2020.016
Abstract:
In-wheel motor has the remarkable advantage and characteristic of highly integrating the powertrain, transmission and brake system, which can save the clutch, gearbox, transmission shaft, differential, transfer case, etc., so as to reduce weight, improve efficiency, simplify chassis structure, and increase vehicle interior available space. However, there are still many bottlenecks to be solved in the way of in-wheel motor industrialization. Combined with the brief analysis of the related technical, cost, manufacturing, marketing and other difficulties of in-wheel motor, the development of the in-wheel motor industrialization is searched and discussed.
In-wheel motor has the remarkable advantage and characteristic of highly integrating the powertrain, transmission and brake system, which can save the clutch, gearbox, transmission shaft, differential, transfer case, etc., so as to reduce weight, improve efficiency, simplify chassis structure, and increase vehicle interior available space. However, there are still many bottlenecks to be solved in the way of in-wheel motor industrialization. Combined with the brief analysis of the related technical, cost, manufacturing, marketing and other difficulties of in-wheel motor, the development of the in-wheel motor industrialization is searched and discussed.
2020, 47(5):94-99.
DOI: 10.12177/emca.2019.176
Abstract:
As an important part of microgrid, bidirectional DC-DC converter can realize the energy flow among various micro sources. However, current sharing problem exists when the converter is operated in parallel. In order to improve the anti-disturbance ability and current sharing control effect of bidirectional DC-DC converter, based on the mathematical model of bidirectional DC-DC converter, a voltage-current double-closed-loop active disturbance rejection control (ADRC) strategy is designed. Considering the current sharing characteristic of parallel operation of bidirectional DC-DC converter, an ADRC current sharing control algorithm for DC-DC converter is proposed by combining ADRC and intermediate current sharing control. The simulation results show that the proposed control system has better rapidity, robustness and adaptability than the traditional PI control system.
As an important part of microgrid, bidirectional DC-DC converter can realize the energy flow among various micro sources. However, current sharing problem exists when the converter is operated in parallel. In order to improve the anti-disturbance ability and current sharing control effect of bidirectional DC-DC converter, based on the mathematical model of bidirectional DC-DC converter, a voltage-current double-closed-loop active disturbance rejection control (ADRC) strategy is designed. Considering the current sharing characteristic of parallel operation of bidirectional DC-DC converter, an ADRC current sharing control algorithm for DC-DC converter is proposed by combining ADRC and intermediate current sharing control. The simulation results show that the proposed control system has better rapidity, robustness and adaptability than the traditional PI control system.
2020, 47(5):100-104.
DOI: 10.12177/emca.2020.008
Abstract:
In view of the problems such as abrasion of stator winding and bearing caused by easy attraction between stator and rotor during the assembly of permanent magnet synchronous motor (PMSM), the specific causes of stator and rotor attraction are analyzed, and a simple and practical stator and rotor assembly process is put forward. The feasibility of the scheme is verified by on-site trial assembly. The stator and rotor assembly technology of PMSM is popularized. It not only solves the problems of winding and bearing abrasion, and improves the assembly quality, but also greatly improves the assembly efficiency of the motor.
In view of the problems such as abrasion of stator winding and bearing caused by easy attraction between stator and rotor during the assembly of permanent magnet synchronous motor (PMSM), the specific causes of stator and rotor attraction are analyzed, and a simple and practical stator and rotor assembly process is put forward. The feasibility of the scheme is verified by on-site trial assembly. The stator and rotor assembly technology of PMSM is popularized. It not only solves the problems of winding and bearing abrasion, and improves the assembly quality, but also greatly improves the assembly efficiency of the motor.
2020, 47(5):105-110.
DOI: 10.12177/emca.2020.020
Abstract:
A high speed current and voltage synchronous acquisition device is developed based on single-chip computer. Without the use of speed and torque sensor, a motor speed identification algorithm based on frequency spectrum analysis and a motor torque identification algorithm based on air gap torque method are proposed. The portable motor energy efficiency test equipment is developed, which can complete the motor energy efficiency test without dismantling the motor on site. This tester can realize convenient and fast test. It is used to test a motor and the test results are compared with those obtained from an integrated motor performance testing system. The good agreement between the results verifies the applicability of the portable tester. It can meet the practical engineering test requirements.
A high speed current and voltage synchronous acquisition device is developed based on single-chip computer. Without the use of speed and torque sensor, a motor speed identification algorithm based on frequency spectrum analysis and a motor torque identification algorithm based on air gap torque method are proposed. The portable motor energy efficiency test equipment is developed, which can complete the motor energy efficiency test without dismantling the motor on site. This tester can realize convenient and fast test. It is used to test a motor and the test results are compared with those obtained from an integrated motor performance testing system. The good agreement between the results verifies the applicability of the portable tester. It can meet the practical engineering test requirements.
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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.
