Simplified Rotor and Stator Resistance Estimation Method Based on Direct Rotor Flux Identification

Wang, Mingyu,Wang, Dafang,Dong, Guanglin,Wei, Hui,Liang, Xiu,Xu, Zexu The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3

Since parameter mismatch seriously impacts the efficiency and stability of induction motor drives, it is important to accurately estimate the rotor and stator resistance. This paper introduces a method to directly calculate the rotor flux that is independent of stator and rotor resistance and electrical angle. It is based on obtaining the rotor and stator resistance using the model reference adaptive system (MRAS) method. The method has a lower computation burden and less adaptation time when compared with other rotor resistance estimation methods. This paper builds three coordinate frames to analyze the rotor flux error and rotor resistance error. A number of implementation issues are also considered.

A Novel Method for Compensating Phase Voltage Based on Online Calculating Compensation Time

Wang, Mingyu,Wang, Dafang,Zhou, Chuanwei,Liang, Xiu,Dong, Guanglin The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2

Dead time and the nonideal characteristics of components all lead to phase voltage distortions. In order to eliminate the harmful effects caused by distortion, numerous methods have been proposed. The efficacy of a method mainly depends on two factors, the compensation voltage amplitude and the phase current polarity. Theoretical derivations and experiments are given to explain that both of these key factors can be deduced from the compensation time, which is defined as the error time between the ideal phase voltage duration and the actual phase voltage duration in one Pulse Width Modulation (PWM) period. Based on this regularity, a novel method for compensating phase voltage has been proposed. A simple circuit is constructed to realize the real-time feedback of the phase voltage. Utilizing the actual phase voltage, the compensation time is calculated online. Then the compensation voltage is derived. Simulation and experimental results show the feasibility and effectivity of the proposed method. They also show that the error voltage is decreased and that the waveform is improved.

Simplified Rotor and Stator Resistance Estimation Method Based on Direct Rotor Flux Identification

Mingyu Wang,Dafang Wang,Guanglin Dong,Hui Wei,Xiu Liang,Zexu Xu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3

Since parameter mismatch seriously impacts the efficiency and stability of induction motor drives, it is important to accurately estimate the rotor and stator resistance. This paper introduces a method to directly calculate the rotor flux that is independent of stator and rotor resistance and electrical angle. It is based on obtaining the rotor and stator resistance using the model reference adaptive system (MRAS) method. The method has a lower computation burden and less adaptation time when compared with other rotor resistance estimation methods. This paper builds three coordinate frames to analyze the rotor flux error and rotor resistance error. A number of implementation issues are also considered.

A Novel Method for Compensating Phase Voltage Based on Online Calculating Compensation Time

Mingyu Wang,Dafang Wang,Chuanwei Zhou,Xiu Liang,Guanglin Dong 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2

Dead time and the nonideal characteristics of components all lead to phase voltage distortions. In order to eliminate the harmful effects caused by distortion, numerous methods have been proposed. The efficacy of a method mainly depends on two factors, the compensation voltage amplitude and the phase current polarity. Theoretical derivations and experiments are given to explain that both of these key factors can be deduced from the compensation time, which is defined as the error time between the ideal phase voltage duration and the actual phase voltage duration in one Pulse Width Modulation (PWM) period. Based on this regularity, a novel method for compensating phase voltage has been proposed. A simple circuit is constructed to realize the real-time feedback of the phase voltage. Utilizing the actual phase voltage, the compensation time is calculated online. Then the compensation voltage is derived. Simulation and experimental results show the feasibility and effectivity of the proposed method. They also show that the error voltage is decreased and that the waveform is improved.

A STATE DETECTION METHOD OF INDUCTION MOTOR BASED ON PSO-BS-SMO

Guanglin Zhong,Wenxin Yu,JunNian Wang 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2

In order to improve the performance of sliding mode observer in detecting the state of induction motor, a state detectionmethod based on particle swarm optimization (PSO)-backstepping (BS)-sliding mode observer (SMO) is proposed in thispaper. In this method, the controller is constructed and the parameters of the control rate are optimized, so that the trackingaccuracy and robustness of the new observer are improved relative to conventional observer, exponential observer, PI andPID. Firstly, the state equation of the induction motor under stator and rotor winding fault and stator current sensor fault isestablished. Secondly, the new sliding mode observer is designed using the backstepping method based on the new reachinglaw. Then, the new fi tness function and PSO is used to optimize the parameters of the new sliding mode observer. Finally,the simulation comparison experiment of stator current state detection is carried out under the simulated fault condition ofinduction motor. The feasibility of the method is verifi ed by comparing the state tracking situation and the state detectionerror. The comparative experimental results show that the method has less jitter, stronger robustness, and higher state trackingaccuracy when detecting stator current states under diff erent faults.

The Identification of Tool Eccentricity Parameters in Micro-Milling

Zhang Xiang,Wang Guanglin 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12

Milling tool eccentricity has great influence in micro-milling. It could cause single edge cutting phenomenon, and effect machining quality and tool life. To recognize tool eccentricity parameters, on the basis of the tool eccentricity model, cutting edge trajectories are analyzed, and then a tool eccentricity identification method is proposed. The parameters of identification model are obtained by experiments and tool eccentricity parameters are calculated by iterative method. Finally, the accuracy of the proposed method is verified by measuring the diameter of a milled hole, and the verified result shows the proposed identification model is effective.

Pneumatic Measuring Method for Inclination Angle of the Edge of Inner Ring Groove

Xiang Zhang,Yang Wang,Guanglin Wang 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.10

The machining quality of the functional edges of inner ring groove have great influence on the performance of electro-hydraulic servo valve. The inclination angle of the functional edge is one of the most important indicators to evaluate the processing quality of functional edges. Therefore, a pneumatic measuring method based on pneumatic measuring theory for measuring the inclination angle of the edge of inner ring groove is proposed. The principle of measuring method and calculation method are analyzed. The measuring system parameters such as air source pressure, inlet nozzle diameter and slit width, which influence the measurement results are compared and analyzed, respectively. The results showed that those three measurement parameters significantly affect the slope of the measuring pressure curve. When the air source pressure, the inlet nozzle diameter and slit width are chosen as 90 kPa, 0.3 mm and 3 mm, respectively, the measurement system can be kept in a "subsonic-subsonic" state and good curve slope can be obtained. Based on the analysis, the measuring air path and other mechanical structure are designed. The experimental results indicate that the inclination angle relative to the central axis is 0.0387°. The proposed pneumatic measuring method can effectively measure the inclination angle of edge of the inner ring groove, which provides a method for evaluating the performance of the valve sleeve.