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Tomonobu Senjyu,Tsuyoshi Shimabukuro,Katsumi Uezato 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Permanent magnet synchronous mo tors generally require a rotor position sensor to achieve the vector control, however, this sensor increases prod uct cost and size of the motor and restricts the in dustrial drive applications. From these backgrounds, position sensorless control has received wide attention. This paper presents a new sensorless drive system for Cylindrical PMSM that provides high-performance vec tor control system using full-order state observer, which provides rotor position and speed information without position and speed sensors.
Urasaki, Naomitsu,Senjyu, Tomonobu,Uezato, Katsumi The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.1
This paper presents parameter measurement for permanent magnet synchronous motors based on the P-Q circle diagram. Three electrical parameters of permanent magnet synchronous motors, i.e., the equivalent iron loss resistance, armature inductance, and electrical motive force (emf) coefficient are simultaneously measured. The advantages of this method are that it can be implemented under constant excitation and it dispenses with the generating test for the emf coefficient. The proposed method is applied to a 160w permanent magnet synchronous motor, and then the measurement results are analyzed.
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Tomonobu Senjyu,Tomiyuki Shirasawa,Katsumi Uezato 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
MAXIMUM POWER POINT TRACKING CONTROL OF PHOTOVOLTAIC ARRAY USING FUZZY NEURAL NETWORK
Tomonobu Seniyu,Yasuyuki Arashiro,Katsumi Uezato,Han Kyung Hee 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
Solar cell has an optimum operating point to extract maximum power To control operating point of the solar cell, a fuzzy controller has already been proposed by our research group However, several parameters are determined by trial and error To overcome this problem, this paper adopts Fuzzy Neural Network (FNN) for maximum power point tracking control for photovoltaic array The FNN can be trained to perfect fuzzy rules and to find an optimum membership functions on-line.<br/>
Tomonobu Senjyu,Akihiro Omoda,Katsumi Uezato 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
Machine parameters need to measure in advance for vector control and theoretical analysis Therefore, we present the machine parameter measurement scheme, considering stator iron loss, by the single-phase test at standstill condition Using this method, the d-q axis inductances and the equivalent iron loss resistance in the voltage equation considering stator iron loss are easily measuied This method is simple and does not need to use complex theory and expensive equipment.<br/>
Self-Commissioning for Surface-Mounted Permanent Magnet Synchronous Motors
Urasaki, Naomitsu,Senjyu, Tomonobu,Uezato, Katsumi The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.1
This paper presents the self-commissioning for surface-mounted permanent magnet synchronous motor. The proposed strategy executes three tests with a vector controlled inverter drive system. To do this, synchronous d-q axes currents are appropriately controlled for each test. From the three tests, armature resistance, armature inductance, equivalent iron loss resistance, and emf coefficient are identified automatically. The validity of the proposed strategy is confirmed by experimental results.
SPEED CONTROL FOR ULTRASONIC MOTORS USING FUZZY ON-LINE TUNING SYSTEM
Tomonobu Senjyu,Yoshihiko Gushiken,Katsumi Uezato 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a speed control for ultrasonic motors using a PI controller and disturbance torque observer Since the PI gams and the observer's poles are generally fixed, the control performance deteriorates when the driving conditions vary much Therefore, we propose the speed control scheme that the PI gains and the observer's poles are adjusted on-line in accordance with the speed ripple using fuzzy reasoning.<br/>
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Senjyu, Tomonobu,Shirasawa, Tomiyuki,Uezato, Katsumi The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell. The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Tomonobu Senjyu,Tomiyuki Shirasawa,Katsumi Uezato 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed a algorithm, that will estimate the duty ratio corresponding to maximum power operation of solar cell The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum For the estimation, we have used the well know Lagrange's interpolation method This method can track maximum power point quickly even for changing solar insolations and avoids oscillations after reaching the maximum power point.<br/>
Self-Commissioning for Surface-Mounted Permanent Magnet Synchronous Motors
Naomitsu Urasaki,Tomonobu Senjyu,Katsumi Uezato 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents the self-commissioning for surface-mounted permanent magnet synchronous motor The proposed strategy executes three tests with a standard inverter drive system To do this, synchronous d-q axes cur-lents are appropriately controlled for each test From the three tests, armature resistance, armature inductance, e-qutvalent iron loss resistance, and emf coefficient are identified automatically The validity of the proposed strategy is confirmed by experimental results.