Toyota National College of Technology

Toyota, Japan

Toyota National College of Technology

Toyota, Japan
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Kawasaki H.,Gifu University | Ueki S.,Toyota National College of Technology
Proceedings of the 2016 IEEE ANDESCON, ANDESCON 2016 | Year: 2016

This paper presents a novel nonlinear disturbance observer for robot manipulators in which the disturbance consists of frictions in joints and external forces exerting on a link. The method permits to estimate the frictions and the external forces separately without of measurement of joint accelerations. Global exponential convergence of the estimated disturbances to the true values is proven based on the Lyapunov theory. Computational simulation is presented for a 2 link robot manipulator to show the effectiveness of the proposed disturbance observer. © 2016 IEEE.


Nakajima M.,Toyota National College of Technology | Tokaji K.,Gifu University | Itoga H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizu T.,Toyota National College of Technology
International Journal of Fatigue | Year: 2010

Very high cycle fatigue tests were conducted under rotating bending and axial loading using a high carbon chromium steel, JIS SUJ2, in order to evaluate the effect of loading condition on subsurface fracture with a fish-eye. In very high cycle region where subsurface crack was generated at a non-metallic inclusion, the fatigue lives under axial loading were shorter than those under rotating bending. This was attributed to the maximum size of non-metallic inclusions included in the control volume, because the sizes of non-metallic inclusions that acted as fracture origin were larger under axial loading than under rotating bending. Under both loading conditions, the Kmax values for crack initiation from non-metallic inclusion decreased with increasing fatigue life and were almost similar irrespective of loading condition, while the threshold K values where the transition from the granular area to the flat area in fish-eye took place depended on the size of the granular area. The transition condition was similar under both loading conditions. © 2009 Elsevier Ltd. All rights reserved.


Akimoto K.,Nagoya University | Emoto T.,Toyota National College of Technology
Journal of Physics Condensed Matter | Year: 2010

Strain can reduce carrier mobility and the reliability of electronic devices and affect the growth mode of thin films and the stability of nanometer-scale crystals. To control lattice strain, a technique for measuring the minute lattice strain at surfaces and interfaces is needed. Recently, an extremely asymmetric x-ray diffraction method has been developed for this purpose. By employing Darwin's dynamical x-ray diffraction theory, quantitative evaluation of strain at surfaces and interfaces becomes possible. In this paper, we review our quantitative strain analysis studies on native SiO2/Si interfaces, reconstructed Si surfaces, Ni/Si(111)-H interfaces, sputtered III-V compound semiconductor surfaces, high-k/Si interfaces, and Au ion-implanted Si. © 2010 IOP Publishing Ltd.


Kano Y.,Toyota National College of Technology | Kosaka T.,Nagoya Institute of Technology | Matsui N.,Nagoya Institute of Technology
IEEE Transactions on Industrial Electronics | Year: 2010

This paper presents a simple nonlinear magnetic analysis for axial-flux permanent-magnet machines as an assistant design tool of 3-D finite-element analysis (3D-FEA). The proposed analysis consists of an equivalent magnetic circuit and an analytical model of air-gap permeances, including saturable permeances in the core. The proposed analysis is capable of calculating the flux distribution and torque characteristics under heavy operating conditions. We verify the accuracy of the proposed analysis by comparing the results with those of 3D-FEA for various design free parameters. After verifying the accuracy of the analysis, we present our analysis-based optimum design, which realizes the maximum torque density while maintaining efficiency at the desired value. Compared to the traditional 3D-FEA, the design method proposed here has the same accuracy, while the computation time is as short as 1/21. © 2006 IEEE.


Kano Y.,Toyota National College of Technology
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper presents the design optimization and performance analyses of a wound-field type brushless synchronous machine (WF-BSM) for traction drives in hybrid electric vehicles (HEVs). Research on a WF-BSM with free rare-earth magnet becomes an attractive research topic recently due to several advantages of robust rotor structure, high power capability that suitable for high-speed motor drive system applications. Furthermore, this machine has advantages of easy cooling of all active parts in the stator. The design target is the motor with maximum power more than 60kW and maximum power density more than 2.7kW/kg. The design optimization of a WF-BSM is performed by means of a finite element analysis-based genetic algorithm (GA). As the design results, the designed machine has achieved maximum power and power density of 90.8kW and 4.11kW/kg, respectively. Thus, the designed motor enables to keep the same power density in the existing IPMSM installed on a commercial HEV. © 2015 IEEE.


Kano Y.,Toyota National College of Technology
2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014 | Year: 2014

This paper overviews recent technical trends of research and development of non rare-earth permanent magnet motors. In particular, switched reluctance motors (SRMs) made of recent developed core materials and flux switching machines (FSMs) are reviewed. © 2014 IEEE.


Kano Y.,Toyota National College of Technology | Kosaka T.,Nagoya Institute of Technology | Matsui N.,Nagoya Institute of Technology
IEEE Transactions on Industry Applications | Year: 2010

This paper presents an optimum design approach to a two-phase switched reluctance motor (SRM) drive. The proposed drive is designed for use as a compressor drive in a small refrigerator as an alternative to the existing brushless dc motor with rare-earth magnets. In the proposed approach, three genetic algorithm loops work to optimize the lamination design and to meet the requirements for the target application while simultaneously fine-tuning the control parameters. To achieve design optimization within a realistic timescale, the repeated calculation required to obtain fitness evaluation does not use finite-element analysis but instead consists of a dynamic simulator based on an analytical expression of magnetizing curves and a geometric flux-tube-based nonlinear magnetic analysis developed specifically for this class of motor. Design results show that the proposed approach can autonomously find a feasible design solution of an SRM drive for the target application from a huge search space. The experimental studies using a two-phase 8/6 prototype manufactured in accordance with the optimized design parameters show the validity of the proposed design approach. © 2006 IEEE.


Kano Y.,Toyota National College of Technology
2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014 | Year: 2014

This paper deals with the design of a concentrated-winding interior permanent magnet synchronous motor (IPMSM) under saliency based-sensorless drive with a high-frequency signal injection for a general industrial application. Compared with distributed-winding IPMSMs, the serious disadvantages of concentrated winding IPMSMs are the narrow sensorless operating region and large torque ripple. To solve the problem, a novel rotor flux barrier design is proposed. The proposed rotor include its V-shape PM arrangements and circular flux-barriers at the rotor-yoke in the center of the N-pole and S-pole. The IPMSM designed is built and tested experimentally. As a result, it is demonstrated that the test machine realizes low-torque ripple under the frequent operating conditions while satisfying the required maximum torque under the sensorless drive. © 2014 IEEE.


Kano Y.,Toyota National College of Technology
IEEE Transactions on Industry Applications | Year: 2015

This paper presents a novel flux barrier design of a torque ripple reduction in a saliency-based sensorless drive concentrated-winding interior permanent magnet synchronous motor (IPMSM). The motor is designed for general-purpose sensorless industrial drives and to fulfill the torque ripple requirement with the required maximum torque under the sensorless drive. The designed rotor has a V-shape magnet, and a circular flux barrier at the rotor yoke in the center of N- and S-poles. A 45-N · m -5.5-kW IPMSM has been manufactured to check the design validity. The validity of the proposed design procedure and the expected drive characteristics are experimentally verified by using the prototype. © 2015 IEEE.


Goto Y.,Nagoya Institute of Technology | Kumar G.P.,Nagoya Institute of Technology | Kawanishi N.,Toyota National College of Technology
Journal of Structural Engineering | Year: 2010

The strength and ductility of thin-walled steel columns under cyclic loads are considerably upgraded by filling concrete into hollow spaces surrounded by steel tube and diaphragms. The above thin-walled steel columns filled with concrete are referred here to as thin-walled CFT columns. Up to the present, no sufficient and precise research has been conducted on the versatile finite-element model (FE model) analysis that can take into account the upgrading mechanism of thin-walled CFT columns in a direct manner. Herein, an accurate FE model is investigated in order to fully include the important factors such as cyclic local buckling of steel tube, nonlinear behavior of confined concrete, and interface action between steel tube and in-filled concrete. The validity of the proposed models is examined by comparing with the results of cyclic loading experiments on CFT columns. With the proposed model, the effect of in-filled concrete on the upgrading mechanism of thin-walled CFT columns is discussed in detail. © 2010 ASCE.

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