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This paper provides an overview of the progress in sensorless permanent magnet synchronous machine (PMSM) control techniques in Japan. In the first stage, the techniques extracted rotor position information by back-EMF zero-crossing detection techniques. Since around 2000, model-based position-sensorless control techniques have been evolved and are widely used in home appliances as well as general...
This paper presents experimental studies on windage loss reduction using two types rotor for hybrid excitation flux switching motor that is intentionally designed so as to compete with an interior permanent magnet synchronous motor installed on TOYOTA PRIUS-2010. This machine makes it possible to vary its field flux by combining the two different mmf sources such as field excitation coils and permanent...
This paper presents a consideration on control strategy for torque ripple suppression in switched reluctance servo motor. It has been disclosed that instantaneous current profiling technique is one of the effective solution to obtain flat torque waveform in SR motor. In the proposed control, the current reference profile are calculated based on torque-current-rotor position (T-i-θ) characteristic...
Proceedings in Information and Communications Technology
Most natural and artificial systems transform information in a predictable or programmable way; such transformation can be interpreted as harnessing nature for computing. Recently we have witnessed a burst of research in unconventional computing, resulting in the development of experimental prototypes of natural computers, plasmodium computers, reaction-diffusion processors, and DNA computers as...
In this paper, we describe a method of modeling the global solar irradiance on a clear sky. The proposed method is based on astrological phenomena, with which we can estimate the global solar irradiance of the few days, several months, and some years. To estimate the irradiance with high accuracy, it is necessary to calculate the solar radiation outside the Earth's atmosphere taking into account the...
This paper presents a study on control strategy for torque ripple reduction in switched reluctance servo motor. It has been revealed that instantaneous current profiling technique is one of the effective solution to suppress the torque ripple in SR motor. The proposed control consists of ideal current reference profile generation and current tracking control. Assuming that the actual current can accurately...
This paper presents design studies of an integrated electrical drive employing a wound field flux switching motor (WFFSM) coupled with a Z-source inverter (ZSI). The WFFSM has field excitation coils as dc field mmf sources locate at the stator body. On the other hand, the ZSI works as a three-phase inverter with voltage boost function by adding a switching device and an impedance-network. The impedance-network...
This paper presents experimental evaluations of drive performances in high-speed range of a wound field synchronous motor (WFSM) drive system integrated with a z-source inverter (ZSI). The WFSM has two field coils as DC field mmf sources instead of permanent magnets. On the other hand, the ZSI employs an impedance-network that consists of two DC reactors and two capacitors. A uniqueness of the proposed...
This paper presents a study on control strategy for active vibration cancellation and noise reduction in SR motor. It has been revealed that 2-stage commutation control based on natural frequency of stator body has been effective to suppress the vibration occurring on the stator body at the commutation. According to some considerations on generation mechanism of the vibration, a new active vibration...
This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act...
This paper presents drive performance comparisons among three-types of current profiling techniques minimizing torque ripple for switched reluctance (SR) motor in terms of current ripple, a number of switching of converter, motor efficiency and noise. As SR motors have strong magnetic nonlinearity, hysteresis current control is commonly used for their drives. In this case, however, switching frequency...
This paper presents experimental drive performances evaluation of wound field flux switching motor for hybrid vehicle drive applications. A test machine with the maximum torque of 210Nm and the maximum power of 123kW expected at its design stage is built. A various experimental test result is demonstrated from viewpoints of the maximum torque and the maximum power capabilities and the motor efficiency...
In this paper, precise pulsewise current drive for switched reluctance motor under subharmonic PWM voltage control is presented. Different from the conventional hysteresis current control, sub-harmonic PWM scheme enables to design switching frequency of converter. However, subharmonic PWM voltage control requires adequate voltage references, that is, PWM duty ratios according to given operating conditions...
This paper proposes instantaneous current profile tracking control for minimizing torque ripple of switched reluctance motors. Because of its unique principle of torque generation different from conventional AC motors, instantaneous current profiling control is essential to regulate the torque with ripple minimized. In addition, since its conventional motor model in order to determine an adequate...
This paper presents a new control method for a super-turbo generating (STG) system using an accurate ship-plant system model that ascertains startup characteristics. The STG system is a waste heat recovery type of generation system that makes use of exhaust gas from the main shipboard diesel engines. With STG systems, however, control during startup is not entirely clear. Startup characteristics from...
We present the design of a saliency-based sensorless drive interior permanent magnet synchronous motor (IPMSM) for a traction drive in hybrid electric vehicles (HEVs), and we introduce the sensorless safety operation region (SSOR), which accounts for cross-coupling magnetic saturation and harmonics of inductance distributions. The SSOR defines a working point under the maximum torque per ampere (MTPA)...
This paper presents design study of high torque and high power density hybrid excitation flux switching synchronous motor (HEFSSM) as a candidate for traction drives in hybrid electric vehicle (HEV). Firstly, the construction, the basic working principle and the design concept of the proposed HEFSSM are overviewed. Then, under some design restrictions and specifications for the target HEV applications,...
Calculation of scattering and absorption properties of ice crystals are important for understanding of radiative transfer in cirrus clouds and the radiation budget of the earth atmospheric system. In this study, parameterization of the single-scattering properties for individual ice crystal of cirrus clouds are investigated using Geometrical-Optics Approximation (GOA) and Surface Integral Equations...
This study is an attempt that is made to interpret multi-wavelength-retrieved cloud droplet effective radii (CDR) and the differences among R16, R21 and R37 in term of cloud vertical droplet distribution. For this purpose, a spectral-bin microphysical cloud model and radiative transfer computation are used to generate the realistic numerical cloud field and to simulate the CDR retrieval in remote...
Permanent magnet flux switching machine (PMFSM) with additional field excitation coil (FEC) has several attractive features compared to conventional permanent magnet (PM) machines because of its variable flux control capability and robust rotor structure suitable to apply for high speed applications. However, the original machine has a limitation of operating in high current condition due to nonessential...
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