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Fukuoka, Japan

Nakae M.,Sasebo College of Technology | Hidaka K.,Meiwa Manufacturing Co. | Morikawa H.,Sasebo College of Technology | Torii T.,Kashifuji Works Ltd. | Sao S.,Kashifuji Works Ltd.
Journal of Advanced Mechanical Design, Systems and Manufacturing | Year: 2011

The objective of this present study is to develop a center-less gear lapping machine that can simultaneously smooth all of tooth flanks of a steel gear to a maximum peak-valley height (Rz) of less than 1 ìm in a short time without fixing the gear to a shaft. A work gear meshes with two lap gears as crossed helical gears and is supported by a guide gear during the lapping. The two lap gears and the guide gear are nylon gears. Lapping slurry which contains abrasive grains is supplied to the meshing teeth. The present paper presents the mechanism of the center-less lapping process and the structure of the lapping machine designed and manufactured by the present authors. The behavior and amount of removed mass of the work gear are investigated during the lapping process. In addition, the work gears lapped using the proposed machine are evaluated with respect to the tooth roughness and the accuracy of the tooth profile, tooth trace, and pitch. Nylon lap gears are also tested to investigate their lives. © 2011 by JSME. Source


Nakazawa Y.,Fukuoka Institute of Technology | Ohyama K.,Fukuoka Institute of Technology | Fujii H.,Meiwa Manufacturing Co. | Uehara H.,Meiwa Manufacturing Co. | Hyakutake Y.,Meiwa Manufacturing Co.
2013 15th European Conference on Power Electronics and Applications, EPE 2013 | Year: 2013

The three magnetization modes in which the magnetization region is shifted according to load based on a linear torque equation are proposed. Efficiency comparison test of the proposed method and a voltage PWM control method is conducted with a real system. © 2013 IEEE. Source


Nakazawa Y.,Fukuoka Institute of Technology | Ohyama K.,Fukuoka Institute of Technology | Fujii K.,Meiwa Manufacturing Co. | Fujii H.,Meiwa Manufacturing Co. | Uehara H.,Meiwa Manufacturing Co.
Proceedings of EPE-PEMC 2010 - 14th International Power Electronics and Motion Control Conference | Year: 2010

The electric vehicles need high efficient torque control system. Therefore, this paper proposes the novel excitation interval control method. The excitation intervals are concentrated around the rotor position where the derivative of inductance becomes maximum values. The efficiency of proposed method is superior to the efficiency of conventional methods. © 2010 IEEE. Source


Nakazawa Y.,Fukuoka Institute of Technology | Ohyama K.,Fukuoka Institute of Technology | Fujii H.,Meiwa Manufacturing Co. | Uehara H.,Meiwa Manufacturing Co. | Hyakutake Y.,Meiwa Manufacturing Co.
IEEJ Transactions on Industry Applications | Year: 2015

This paper proposes a single-pulse control method for improving the efficiency of switched reluctance motors. The proposed method has three excitation modes to vary the excitation interval according to the conduction angle reference value. Experiments were carried out with a real system to compare the efficiencies of the proposed method and the voltage-PWM control with a constant excitation period. The efficiency of the proposed method was a maximum of 13.2% higher in the low-medium speed and high load regions compared with the voltage-PWM control. © 2015 The Institute of Electrical Engineers of Japan. Source


Nakazawa Y.,Fukuoka Institute of Technology | Ohyama K.,Fukuoka Institute of Technology | Nouzuka K.,Fukuoka Institute of Technology | Fujii H.,Meiwa Manufacturing Co. | And 2 more authors.
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2016

SUMMARY The motor efficiencies of switched reluctance motors (SRMs) are inferior to those of permanent magnet synchronous motors. This paper describes a design procedure for an SRM to obtain a higher motor efficiency. The first step in the design procedure makes clear the principle for improving the motor efficiency. The cross-sectional and axial shapes of the rotor and stator cores are designed by magnetic field analysis with the two-dimensional (2D) and 3D finite element method. A high-efficiency SRM with 12 stator poles and eight rotor poles is designed. The designed SRM was produced experimentally, and was tested to verify its performance. The motor efficiency was improved in comparison to the standard SRM with six stator poles and four rotor poles. © 2015 Wiley Periodicals, Inc. Source

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