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Kan Akatsu,Atsuo Kawamura 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In the speed sensorless control of the induction motor, the machine parameters (especially the secondary resistance R_2) have a strong influence to the speed estimation. It is known that the simultaneous estimation of the speed and R_2is impossible in the slip frequency type vector control, because the secondary flux is constant. But the secondary flux is not always constant In the speed transient state. In this paper the R_2estimation in the transient state without adding any additional signal to the stator current is proposed. This algorithm uses the least mean square algorithm and the adaptive algorithm, and it is possible to estimate the R_2 exactly. This algorithm is verified by the digital simulations and the experiments.<br/>
Variable characteristics DC motor by changing brush lead angle to expand the operation range
Daichi Takura,Kan Akatsu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a variable characteristics DC motor by changing a brush lead angle to expand the motor operation range. In the proposed method, to change the brushes angle of DC motor means to change the current phase flowing into a motor. By using this technique, the back-EMF can be variable, the motor driving range can be expanded. The definition of brush lead angle in this study is firstly explained. Next, it is shown that the brush lead angle is considered as a same meaning with a current lead angle of Permanent Magnet Synchronous Motors (PMSMs) by adapting dq theory to the DC motor. Adding that, a simulation result that the brush angle of DC motor determines the operation range is shown and effectiveness of the proposed method is verified by experiments. Finally it clarifies the drive range expansion with efficiency in each brush angle.
Dongwoo Lee,Kan Akatsu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a study on the algorithm transition from sensored to sensorless control when the position sensor fault of interior permanent magnet synchronous motor (IPMSM) occurs. The determination of threshold values related to the difference between estimated value and actual value is necessary to decide the fault condition of speed and position sensor. This threshold value should be selected by a higher value than the maximum overshoot caused by acceleration or deceleration of motor as well as steady state error. The overshoot values are depend on the gain of speed and position estimator for sensorless control. In this paper, the relation between the overshoot values and estimator gains is studied to define the stable selection of threshold value. The designed estimator gain and threshold value are verified by experimental results in order to obtain the stable algorithm transition.
A new SRM drive method by using current source inverter
Gaku Ando,Kan Akatsu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents new SRM drive method by using the current source inverter. A problem that huge induced voltage is generated by using the current source inverter is solved by the proposed inverter circuit which has a voltage clamp circuit. The simulation results and the experimental results show that the induced switch voltage is reduced in the clamped circuit.
Investigation of current measurement method of bonding wire by using GMR sensor
Tatsuru Tamori,Kan Akatsu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Recently, a miniaturization of the inverter module in the drive system is proceeding. One of the problems of the miniaturization of the inverter module is the heat generation density increase as the inverter module becomes smaller. Since a bonding wire in the inverter module is disconnected due to heat, it is necessary to early detect the disconnection for the protection of the system. In this research, by setting a GMR sensor under the bonding wire in the inverter module, we propose a small inverter module with a built-in GMR sensor. This paper focuses on a method of disconnection detection with the GMR sensor at under the bonding wire and selecting the appropriate GMR sensor position.
Vibration Reduction Method in SRM with a Smoothing Voltage Commutation by PWM
Akiko Tanabe,Kan Akatsu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Vibration and acoustic noise generated by the excitation force at radial direction (radial force) of Switched Reluctance Motors are the most critical issue. Due to these unfavorable characteristics of SR motors, the application for the industry machine has been delayed. The main factor of the vibration in the driving condition is caused by an electromagnetic force in the radial direction. The radial force is generated when the voltage instantly turned off, this instantaneous voltage change makes all of resonant frequency of the motor excite. This paper considers that a relationship between a variation of the input voltage and the generated vibration to establish a low vibration and low acoustic noise driving method. A new method to reduce them by adding a smoothing voltage modulated by PWM is proposed in this paper, the method is compared with the conventional single pulse operation by experimental results.
Design challenges for 13.56MHz 10 kW resonant inverter for wireless power transfer systems
Nguyen Kien Trung,Kan Akatsu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents the design process of a 13.56 MHz 10 kW and high efficiency inverter for wireless power transfer systems. The main challenges that are the effect of the parasitic components, the using of the high-speed switching devices and the inverter topology are discussed. Finally, an optimal design of 10kW inverter using E-mode GaN is shown with the efficiency of over 95%.
PCB design for 13.56MHz half-bridge class D inverter for wireless power transfer system
Nguyen Kien Trung,Takuya Ogata,Shinichi Tanaka,Kan Akatsu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
At 13.56MHz, the inverter is strongly affected by parasitic elements. The print circuit board (PCB) design is very critical because it control the parasitic elements on the circuit. This paper analyzes the effect of parasitic elements on switching performance of MOSFETs in 13.56MHz class D inverter. This work also proposes an improved PCB design which can provide a 23.4% decrease in parasitic inductance comparing with conventional PCB design.