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Volume 49,Issue 3,2022 Table of Contents
2022, 49(3):1-6,17.
DOI: 10.12177/emca.2021.194
Abstract:
In order to reduce the fluctuation of permanent magnet synchronous motor (PMSM) in approach motion status and improve the stability of the control system, a new sliding mode speed control algorithm based on exponential approaching law is designed. Based on the traditional exponential approaching law, a smoother function at the origin is introduced to replace the original symbolic function. The smooth transition of the control algorithm is expected to be realized when the motor runs in the approach motion status. The stability of the algorithm is verified by Lyapunov function. Based on the new control algorithm, a new sliding mode controller is built using MATLAB/Simulink software. The simulation results show that the proposed algorithm can better realize the control of PMSM. Compared with the traditional exponential approaching law control system, the designed system can effectively reduce the system chattering and enhance the robustness.
In order to reduce the fluctuation of permanent magnet synchronous motor (PMSM) in approach motion status and improve the stability of the control system, a new sliding mode speed control algorithm based on exponential approaching law is designed. Based on the traditional exponential approaching law, a smoother function at the origin is introduced to replace the original symbolic function. The smooth transition of the control algorithm is expected to be realized when the motor runs in the approach motion status. The stability of the algorithm is verified by Lyapunov function. Based on the new control algorithm, a new sliding mode controller is built using MATLAB/Simulink software. The simulation results show that the proposed algorithm can better realize the control of PMSM. Compared with the traditional exponential approaching law control system, the designed system can effectively reduce the system chattering and enhance the robustness.
2022, 49(3):7-17.
DOI: 10.12177/emca.2021.206
Abstract:
High voltage inverter for high voltage motor has great energy saving and high efficiency, and has been widely used. The cascaded H-bridge multilevel converter adopts the modular design concept. The functions of high voltage and high power are realized by cascading multiple identical low voltage conversion units, and the output current harmonic of the converter is small. Pole-phase modulation induction motor can combine the control method of traditional three-phase motor with pole-phase modulation mode to expand the ranges of motor torque and speed. A cascaded H-bridge multilevel frequency converter is introduced to drive a pole-phase modulation induction motor with 9-phase 4-pole and 3-phase 12-pole stator windings. The simulation results show that the cascaded H-bridge multilevel converter can meet the performance of the variable frequency speed regulation and pole-phase modulation vector control of pole-phase modulation induction motor, providing technical support for high-voltage and high-power fields such as new energy power generation, ship propulsion and industrial transmission.
High voltage inverter for high voltage motor has great energy saving and high efficiency, and has been widely used. The cascaded H-bridge multilevel converter adopts the modular design concept. The functions of high voltage and high power are realized by cascading multiple identical low voltage conversion units, and the output current harmonic of the converter is small. Pole-phase modulation induction motor can combine the control method of traditional three-phase motor with pole-phase modulation mode to expand the ranges of motor torque and speed. A cascaded H-bridge multilevel frequency converter is introduced to drive a pole-phase modulation induction motor with 9-phase 4-pole and 3-phase 12-pole stator windings. The simulation results show that the cascaded H-bridge multilevel converter can meet the performance of the variable frequency speed regulation and pole-phase modulation vector control of pole-phase modulation induction motor, providing technical support for high-voltage and high-power fields such as new energy power generation, ship propulsion and industrial transmission.
2022, 49(3):18-27.
DOI: 10.12177/emca.2021.153
Abstract:
In order to reduce ripple of torque and stator flux in conventional model predictive control (MPC) for induction motor due to the fixed action time of voltage vectors, deadbeat (DB) control is used to optimize the action time. An optimized strategy is proposed to simplify candidate voltage vectors and eliminate weighting factor. Control performances and real-time performances of the conventional MPC, the conventional deadbeat model predictive control (DB-MPC) and the proposed strategy are compared through simulation and experiment. Simulation results show that conventional MPC can decrease torque ripple by extending voltage vectors. Compared with MPC, DB-MPC can decrease torque ripple, stator flux ripple and total harmonic distortion (THD) of stator current dramatically and it can decrease stator flux ripple and THD of current by extending voltage vectors. The proposed strategy decreases candidate voltage vectors, eliminates weighting factor and keeps the control performances almost the same as the conventional DB-MPC. Time consumption results based on STM32F103 chip show that extending candidate voltage vectors will increase calculation burden. With the same candidate voltage vectors, the calculation burden of conventional MPC is almost the same as the conventional DB-MPC. With the same control performances, the proposed strategy can decrease time consumption markedly and improve the real-time performance.
In order to reduce ripple of torque and stator flux in conventional model predictive control (MPC) for induction motor due to the fixed action time of voltage vectors, deadbeat (DB) control is used to optimize the action time. An optimized strategy is proposed to simplify candidate voltage vectors and eliminate weighting factor. Control performances and real-time performances of the conventional MPC, the conventional deadbeat model predictive control (DB-MPC) and the proposed strategy are compared through simulation and experiment. Simulation results show that conventional MPC can decrease torque ripple by extending voltage vectors. Compared with MPC, DB-MPC can decrease torque ripple, stator flux ripple and total harmonic distortion (THD) of stator current dramatically and it can decrease stator flux ripple and THD of current by extending voltage vectors. The proposed strategy decreases candidate voltage vectors, eliminates weighting factor and keeps the control performances almost the same as the conventional DB-MPC. Time consumption results based on STM32F103 chip show that extending candidate voltage vectors will increase calculation burden. With the same candidate voltage vectors, the calculation burden of conventional MPC is almost the same as the conventional DB-MPC. With the same control performances, the proposed strategy can decrease time consumption markedly and improve the real-time performance.
2022, 49(3):28-32.
DOI: 10.12177/emca.2021.195
Abstract:
In order to solve the contradiction between the chattering and dynamic response performance of the sliding mode control system, a fuzzy sliding mode control strategy is proposed to adjust the switching gain in real time according to the system error. When the speed error is large, the switching gain becomes larger and the dynamic response performance of the system is improved. When the speed error is small, the switching gain becomes smaller and the chattering of the system is reduced. For fuzzy control, the new fuzzy rule is proposed, and the speed error is taken as a single input variable, which simplifies the parameter tuning. The sliding mode controller uses the constant speed reaching law and the saturation function instead of the sign function to further reduce the chattering. Simulation analysis and experimental results show that the fuzzy sliding mode control system can effectively reduce the system chattering while improving the dynamic response performance.
In order to solve the contradiction between the chattering and dynamic response performance of the sliding mode control system, a fuzzy sliding mode control strategy is proposed to adjust the switching gain in real time according to the system error. When the speed error is large, the switching gain becomes larger and the dynamic response performance of the system is improved. When the speed error is small, the switching gain becomes smaller and the chattering of the system is reduced. For fuzzy control, the new fuzzy rule is proposed, and the speed error is taken as a single input variable, which simplifies the parameter tuning. The sliding mode controller uses the constant speed reaching law and the saturation function instead of the sign function to further reduce the chattering. Simulation analysis and experimental results show that the fuzzy sliding mode control system can effectively reduce the system chattering while improving the dynamic response performance.
2022, 49(3):33-39.
DOI: 10.12177/emca.2021.207
Abstract:
The traditional electromagnetic suction levitation adopts air gap feedback to realize closed-loop control, while the air gap sensor has the disadvantages of large volume, high cost and complex installation. An electromagnetic suction levitation method is proposed, in which the air gap is observed by magnetic field and current, and the observed air gap is used for closed-loop feedback. The functional relationship between air gap, magnetic field and current is studied by theoretical analysis and simulation. The position of magnetic field measuring point is designed and analyzed. The measured data show that the observed air gap under the proposed electromagnetic suction levitation method is consistent with the measured air gap, so it can be used for closed-loop feedback. The influence of observation fitting coefficient on the stability of closed-loop system is analyzed theoretically. Finally, the stable levitation at 7 mm is realized in experiment.
The traditional electromagnetic suction levitation adopts air gap feedback to realize closed-loop control, while the air gap sensor has the disadvantages of large volume, high cost and complex installation. An electromagnetic suction levitation method is proposed, in which the air gap is observed by magnetic field and current, and the observed air gap is used for closed-loop feedback. The functional relationship between air gap, magnetic field and current is studied by theoretical analysis and simulation. The position of magnetic field measuring point is designed and analyzed. The measured data show that the observed air gap under the proposed electromagnetic suction levitation method is consistent with the measured air gap, so it can be used for closed-loop feedback. The influence of observation fitting coefficient on the stability of closed-loop system is analyzed theoretically. Finally, the stable levitation at 7 mm is realized in experiment.
2022, 49(3):40-47.
DOI: 10.12177/emca.2021.198
Abstract:
An equivalent magnetic network model for hybrid excitation double-stator bearingless switched reluctance motor (BSRM) is presented. This model can analyze the static characteristics of motor suspension and torque windings, such as flux linkage, inductance, suspension force and torque. Equivalent magnetic network (EMN) can not only ensure certain precision, but also save time compared with finite element method (FEM). An EMN model is established based on a 24/16/8 hybrid excitation double-stator BSRM, and the calculation formulas of stator and rotor tooth, yoke and air gap magnetic conductivity are deduced. The matrix equation is established to solve the magnetic flux density of each part, and then the flux linkage, inductance, suspension force and torque characteristics of suspension and torque windings are obtained, which are compared with the results of FEM. It can be found that the electromagnetic characteristics solved by EMN agree well with the results of FEM, which further indicates the validity of the model.
An equivalent magnetic network model for hybrid excitation double-stator bearingless switched reluctance motor (BSRM) is presented. This model can analyze the static characteristics of motor suspension and torque windings, such as flux linkage, inductance, suspension force and torque. Equivalent magnetic network (EMN) can not only ensure certain precision, but also save time compared with finite element method (FEM). An EMN model is established based on a 24/16/8 hybrid excitation double-stator BSRM, and the calculation formulas of stator and rotor tooth, yoke and air gap magnetic conductivity are deduced. The matrix equation is established to solve the magnetic flux density of each part, and then the flux linkage, inductance, suspension force and torque characteristics of suspension and torque windings are obtained, which are compared with the results of FEM. It can be found that the electromagnetic characteristics solved by EMN agree well with the results of FEM, which further indicates the validity of the model.
2022, 49(3):48-54，67.
DOI: 10.12177/emca.2022.001
Abstract:
Under the power supply mode of frequency converter, high speed permanent magnet motor has large rotor eddy current loss. Due to the poor heat dissipation capacity of the rotor, it is easy to cause high temperature rise of permanent magnet and irreversible demagnetization. The shell water cooling structure can effectively remove the heat from the stator side of the motor, but the cooling effect of the water cooling structure is limited for the rotor of high speed permanent magnet motor. Taking a 15 kW, 30 000 r/min high speed permanent magnet motor as an example, an air-water hybrid cooling structure is designed. Based on the fluid structure coupling calculation method, the effects of water velocity, wind direction and different cross-sectional area of air duct on the temperature rise of motor permanent magnet are analyzed, and the relative optimal values are obtained. Compared with the water cooling structure only, the air-water hybrid cooling structure can reduce the temperature rise of permanent magnet by 18.1 K. This structure can provide a certain reference for the cooling system design of high power high speed permanent magnet motor.
Under the power supply mode of frequency converter, high speed permanent magnet motor has large rotor eddy current loss. Due to the poor heat dissipation capacity of the rotor, it is easy to cause high temperature rise of permanent magnet and irreversible demagnetization. The shell water cooling structure can effectively remove the heat from the stator side of the motor, but the cooling effect of the water cooling structure is limited for the rotor of high speed permanent magnet motor. Taking a 15 kW, 30 000 r/min high speed permanent magnet motor as an example, an air-water hybrid cooling structure is designed. Based on the fluid structure coupling calculation method, the effects of water velocity, wind direction and different cross-sectional area of air duct on the temperature rise of motor permanent magnet are analyzed, and the relative optimal values are obtained. Compared with the water cooling structure only, the air-water hybrid cooling structure can reduce the temperature rise of permanent magnet by 18.1 K. This structure can provide a certain reference for the cooling system design of high power high speed permanent magnet motor.
2022, 49(3):55-60.
DOI: 10.12177/emca.2022.002
Abstract:
The development of variable frequency speed regulation three-phase permanent magnet synchronous motor series products with IE4 efficiency grade is introduced. In order to improve the design accuracy and shorten the design cycle, the electromagnetic design of this series of products adopts the design method based on the combination of field and circuit. On the one hand, it improves the rationality of the design, and the product performance index fully meets the standard requirements. On the other hand, the reasonable magnetic circuit design improves the power density of the motor and reduces the volume of the motor. Compared with the general series products, this series generally reduces 1~2 frame numbers and reduces the material cost. Through prototype trial production and type test, the rationality of series motor design is verified, which provides a reference for IE4 general variable frequency speed regulation three-phase permanent magnet synchronous motor research in China.
The development of variable frequency speed regulation three-phase permanent magnet synchronous motor series products with IE4 efficiency grade is introduced. In order to improve the design accuracy and shorten the design cycle, the electromagnetic design of this series of products adopts the design method based on the combination of field and circuit. On the one hand, it improves the rationality of the design, and the product performance index fully meets the standard requirements. On the other hand, the reasonable magnetic circuit design improves the power density of the motor and reduces the volume of the motor. Compared with the general series products, this series generally reduces 1~2 frame numbers and reduces the material cost. Through prototype trial production and type test, the rationality of series motor design is verified, which provides a reference for IE4 general variable frequency speed regulation three-phase permanent magnet synchronous motor research in China.
2022, 49(3):61-67.
DOI: 10.12177/emca.2021.205
Abstract:
Torque ripple is an important factor affecting the performance of motor. Aiming at the problem of large torque ripple in normal interior permanent magnet motors, an unequal magnetic pole combination method keeping the total amount of permanent magnet unchanged is proposed. The method makes the pole-arc length of a magnetic pole different from other magnetic poles to suppress torque ripple. The detailed derivation process and the determination method of magnetic pole parameters are given, and the performance is compared with the skewed slot structure. Aiming at the interior structure of the outer rotor, two magnetic isolation measures of magnetic bridge and magnetic barrier are compared and analyzed, and the finite element modeling method is established for simulation and verification of the structure. Finally, a 55 kW, 2 500 r/min motor is developed, and the experimental data are consistent with the simulation results, verifying that the proposed method has a significant weakening effect on cogging torque and back electromotive force (EMF) harmonics. It can effectively suppress torque ripple and improve the motor performance and has practical engineering significance.
Torque ripple is an important factor affecting the performance of motor. Aiming at the problem of large torque ripple in normal interior permanent magnet motors, an unequal magnetic pole combination method keeping the total amount of permanent magnet unchanged is proposed. The method makes the pole-arc length of a magnetic pole different from other magnetic poles to suppress torque ripple. The detailed derivation process and the determination method of magnetic pole parameters are given, and the performance is compared with the skewed slot structure. Aiming at the interior structure of the outer rotor, two magnetic isolation measures of magnetic bridge and magnetic barrier are compared and analyzed, and the finite element modeling method is established for simulation and verification of the structure. Finally, a 55 kW, 2 500 r/min motor is developed, and the experimental data are consistent with the simulation results, verifying that the proposed method has a significant weakening effect on cogging torque and back electromotive force (EMF) harmonics. It can effectively suppress torque ripple and improve the motor performance and has practical engineering significance.
10 Research on Reduction Method of PMSM Electromagnetic Vibration Noise Based on Rotor Auxiliary Slots
2022, 49(3):68-76.
DOI: 10.12177/emca.2021.181
Abstract:
The radial electromagnetic force in the air gap of the motor acts on the teeth of the stator and is transmitted to the air through the stator and the base, resulting in vibration and noise. Aiming at the prominent problem of noise in actual engineering, the main order and frequency of vibration and noise are obtained by analyzing the radial electromagnetic force. The frequencies under different spatial orders are obtained by analyzing the stator mode of the motor. Considering the salient poles of the motor rotor, a method of opening auxiliary slots in the rotor and increasing the air gap width is proposed to improve the acoustic and vibration characteristics of the motor. The effectiveness of the proposed method is verified by building the finite element model before and after optimization and comparing the electromagnetic force of frequencies 6 f1 and 12 f1 (f1 is the fundamental frequency) under acceleration conditions and the A-weighted sound pressure level under the 24th order and 48th order. Finally, the vibration level and sound pressure level under the 24th order and the 48th order under accelerated conditions are tested on the actual prototype. Experiment results show that the proposed method of opening auxiliary slots on the rotor and changing the air gap width can effectively reduce the vibration and noise of the whole motor.
The radial electromagnetic force in the air gap of the motor acts on the teeth of the stator and is transmitted to the air through the stator and the base, resulting in vibration and noise. Aiming at the prominent problem of noise in actual engineering, the main order and frequency of vibration and noise are obtained by analyzing the radial electromagnetic force. The frequencies under different spatial orders are obtained by analyzing the stator mode of the motor. Considering the salient poles of the motor rotor, a method of opening auxiliary slots in the rotor and increasing the air gap width is proposed to improve the acoustic and vibration characteristics of the motor. The effectiveness of the proposed method is verified by building the finite element model before and after optimization and comparing the electromagnetic force of frequencies 6 f1 and 12 f1 (f1 is the fundamental frequency) under acceleration conditions and the A-weighted sound pressure level under the 24th order and 48th order. Finally, the vibration level and sound pressure level under the 24th order and the 48th order under accelerated conditions are tested on the actual prototype. Experiment results show that the proposed method of opening auxiliary slots on the rotor and changing the air gap width can effectively reduce the vibration and noise of the whole motor.
2022, 49(3):77-86,102.
DOI: 10.12177/emca.2021.200
Abstract:
In order to cope with the challenge of randomness and volatility brought by large-scale renewable energy access to the power grid, and to ensure the flexibility of renewable energy utilization, it has become a hot topic to add reasonable energy storage equipment into the actual power grid operation. A load frequency control (LFC) strategy based on linear auto disturbance rejection technology is proposed. It can solve the problem of electrochemical energy storage participating in frequency modulation of interconnected power grid with pumped storage power station. Based on the establishment of a combined pumping/storage LFC model considering the dead zone of the governor, the power generation speed limit and the other nonlinear conditions, the performances of different controllers are compared, and a designed second-order linear active disturbance rejection controller (LADRC) is adopted, with its excellent control performance and the introduction of demand response (DR) to participate in frequency regulation. The simulation verifies that the system has stronger anti-interference ability after adding electrochemical energy storage to the pumped storage, and has a good dynamic response to smooth the frequency fluctuation of the power grid.
In order to cope with the challenge of randomness and volatility brought by large-scale renewable energy access to the power grid, and to ensure the flexibility of renewable energy utilization, it has become a hot topic to add reasonable energy storage equipment into the actual power grid operation. A load frequency control (LFC) strategy based on linear auto disturbance rejection technology is proposed. It can solve the problem of electrochemical energy storage participating in frequency modulation of interconnected power grid with pumped storage power station. Based on the establishment of a combined pumping/storage LFC model considering the dead zone of the governor, the power generation speed limit and the other nonlinear conditions, the performances of different controllers are compared, and a designed second-order linear active disturbance rejection controller (LADRC) is adopted, with its excellent control performance and the introduction of demand response (DR) to participate in frequency regulation. The simulation verifies that the system has stronger anti-interference ability after adding electrochemical energy storage to the pumped storage, and has a good dynamic response to smooth the frequency fluctuation of the power grid.
2022, 49(3):87-92.
DOI: 10.12177/emca.2021.202
Abstract:
A wide frequency range control strategy for medium voltage DC access is proposed for doubly-fed wind power generation system with stand-alone operation. Compared with the traditional line-commutated converter (LCC) DC connection, through the coordinated control of the rotor side converter and the grid converter of the doubly-fed wind generator, the stator frequency changes in a wide range with the wind speed, while keeping the stator flux unchanged, so as to realize the efficient operation of the doubly-fed wind generator. Simulation is carried out with the wide frequency range control strategy of a single 1.5 MW doubly-fed wind generation. The simulation results show that in the maximum wind energy tracking region from the cut-in wind speed to the rated wind speed, wide frequency range control can be achieved, and the efficiency is improved in the whole wind speed range.
A wide frequency range control strategy for medium voltage DC access is proposed for doubly-fed wind power generation system with stand-alone operation. Compared with the traditional line-commutated converter (LCC) DC connection, through the coordinated control of the rotor side converter and the grid converter of the doubly-fed wind generator, the stator frequency changes in a wide range with the wind speed, while keeping the stator flux unchanged, so as to realize the efficient operation of the doubly-fed wind generator. Simulation is carried out with the wide frequency range control strategy of a single 1.5 MW doubly-fed wind generation. The simulation results show that in the maximum wind energy tracking region from the cut-in wind speed to the rated wind speed, wide frequency range control can be achieved, and the efficiency is improved in the whole wind speed range.
13 Impedance Modeling and Analysis of Hybrid Power Supply System with Transformer and Diesel Generator
2022, 49(3):93-98.
DOI: 10.12177/emca.2021.180
Abstract:
The fitting between the existing impedance modeling analysis results and the actual curve is difficult to meet the working needs of the hybrid power supply system. Therefore, the impedance modeling analysis of the hybrid power supply system of transformer and diesel generator is proposed. The working characteristics of major power generation equipment such as transformer and diesel generator are analyzed and the working principle of the hybrid power supply system is discussed. In consideration of the process of coordinate rotation transformation, port impedance and constant power load, the impedance model of the hybrid power supply system of transformer and diesel generator is established. The power system impedance is measured online, the control parameters of phase locked loop (PLL) are adjusted, and the impedance of the model under the Nyquist curve is output. The test results of the model show that using the proposed method, the degress of fitting of the impedance properties are increased by 20% and 30%, respectively, for the positive order impedance, and increased by 11% and 13%, respectively, for the negative order impedance.
The fitting between the existing impedance modeling analysis results and the actual curve is difficult to meet the working needs of the hybrid power supply system. Therefore, the impedance modeling analysis of the hybrid power supply system of transformer and diesel generator is proposed. The working characteristics of major power generation equipment such as transformer and diesel generator are analyzed and the working principle of the hybrid power supply system is discussed. In consideration of the process of coordinate rotation transformation, port impedance and constant power load, the impedance model of the hybrid power supply system of transformer and diesel generator is established. The power system impedance is measured online, the control parameters of phase locked loop (PLL) are adjusted, and the impedance of the model under the Nyquist curve is output. The test results of the model show that using the proposed method, the degress of fitting of the impedance properties are increased by 20% and 30%, respectively, for the positive order impedance, and increased by 11% and 13%, respectively, for the negative order impedance.
2022, 49(3):99-102.
DOI: 10.12177/emca.2021.185
Abstract:
Aiming at the disadvantages of traditional inverter precharge circuit such as optocoupler isolation and additional circuit participation, complex software algorithm and inconvenient debugging, a precharge circuit with constant current adaptive function is designed. The circuit adopts a structure similar to buck circuit. It adaptively maintains closed-loop stability, provides relatively stable power supply for thyristor triggering, and can realize alternate opening of each phase thyristor without relying on software participation. At the same time, there is no need to pay attention to the optocoupler isolation and the timing issue of switching power supply priority. The PSIM simulation results are consistent with the test results of the physical platform. The test waveform shows that the circuit scheme is feasible and easy to debug, and it has certain reference value.
Aiming at the disadvantages of traditional inverter precharge circuit such as optocoupler isolation and additional circuit participation, complex software algorithm and inconvenient debugging, a precharge circuit with constant current adaptive function is designed. The circuit adopts a structure similar to buck circuit. It adaptively maintains closed-loop stability, provides relatively stable power supply for thyristor triggering, and can realize alternate opening of each phase thyristor without relying on software participation. At the same time, there is no need to pay attention to the optocoupler isolation and the timing issue of switching power supply priority. The PSIM simulation results are consistent with the test results of the physical platform. The test waveform shows that the circuit scheme is feasible and easy to debug, and it has certain reference value.
2022, 49(3):103-108.
DOI: 10.12177/emca.2021.197
Abstract:
External rotor permanent magnet synchronous motor (PMSM) as in-wheel motor is widely used in electric vehicles, but there are few studies on in-wheel motor vibration and noise. An in-wheel motor with the rated power of 10 kW and the rated speed of 500 r/min is taken as an example to calculate the radial electromagnetic force density and vibration and noise characteristics of the motor in finite element simulation by constructing 2D finite element model of the in-wheel motor. The vibration and noise characteristics of the external rotor in-wheel motor are studied from pole arc coefficient and auxiliary slots on stator teeth. It is shown in simulation that the vibration and noise characteristics of the in-wheel motor are better when the pole arc coefficient is about 0.72 and double auxiliary slots are set on the stator teeth tip.
External rotor permanent magnet synchronous motor (PMSM) as in-wheel motor is widely used in electric vehicles, but there are few studies on in-wheel motor vibration and noise. An in-wheel motor with the rated power of 10 kW and the rated speed of 500 r/min is taken as an example to calculate the radial electromagnetic force density and vibration and noise characteristics of the motor in finite element simulation by constructing 2D finite element model of the in-wheel motor. The vibration and noise characteristics of the external rotor in-wheel motor are studied from pole arc coefficient and auxiliary slots on stator teeth. It is shown in simulation that the vibration and noise characteristics of the in-wheel motor are better when the pole arc coefficient is about 0.72 and double auxiliary slots are set on the stator teeth tip.
2022, 49(3):109-113.
DOI: 10.12177/emca.2021.196
Abstract:
Three-phase asynchronous motor test prototypes with IE5 energy efficiency grade have been designed and developed by using cast copper rotor technology, low-voltage unequal turn winding technology, low loss silicon steel material and other technologies. In order to accurately measure the field operation efficiency of three-phase asynchronous motors, the energy efficiency comparison test of the developed prototypes is carried out by using methods A, B and E1 according to the national standard GB/T 1032—2012 Test procedures for three-phase induction motors, and the differences among the three test methods are studied and analyzed. For the three series of IE5 energy efficiency grade prototypes tested, the calculation efficiency of method B can meet the requirements of grade-1 energy efficiency in GB 18613—2020 Minimum allowable values of energy efficiency and values of efficiency grades for motors.
Three-phase asynchronous motor test prototypes with IE5 energy efficiency grade have been designed and developed by using cast copper rotor technology, low-voltage unequal turn winding technology, low loss silicon steel material and other technologies. In order to accurately measure the field operation efficiency of three-phase asynchronous motors, the energy efficiency comparison test of the developed prototypes is carried out by using methods A, B and E1 according to the national standard GB/T 1032—2012 Test procedures for three-phase induction motors, and the differences among the three test methods are studied and analyzed. For the three series of IE5 energy efficiency grade prototypes tested, the calculation efficiency of method B can meet the requirements of grade-1 energy efficiency in GB 18613—2020 Minimum allowable values of energy efficiency and values of efficiency grades for motors.
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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.
