scholarly journals Research on a novel axial-flux magnetic-field-modulated brushless double-rotor machine with low axial force and high efficiency

AIP Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 056668
Author(s):  
Chengde Tong ◽  
Zhiyi Song ◽  
Jingang Bai ◽  
Jiaqi Liu ◽  
Ping Zheng
Keyword(s):  
Magnetic Field ◽  
Axial Force ◽  
High Efficiency ◽  
Axial Flux

Permanent Magnet Heater for Special Applications

2015 ◽  
Vol 792 ◽  
pp. 476-481
Author(s):  
Michele Forzan ◽  
Fabrizio Dughiero
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Induction Heating ◽  
Permanent Magnets ◽  
Lower Cost ◽  
High Efficiency ◽  
Mechanical Design ◽  
Fixed Position ◽  
Dc Magnetic Field ◽  
Research Activities

This paper presents a review of the research activities carried out at the Laboratory for Electroheat of Padova University (LEP) in the field of high efficiency through heating of aluminum workpieces. Induction heating obtained by rotating a billet in a DC magnetic field produced by superconductive coils was the first attempt to reach high electrical efficiency in mass heating of high conductive metals, like aluminum, copper and brass. More recently, the same concept has been applied by rotating rare earth permanent magnets around a metal billet kept in a fixed position. This technology appears much more promising because of lower cost of installation and a more robust mechanical design.

High efficiency guided-wave magnetooptic Bragg cell modulator using nonuniform bias magnetic field

1997 ◽  
Vol 71 (25) ◽  
pp. 3715-3717 ◽  
Author(s):  
C. S. Tsai ◽  
Y. S. Lin ◽  
J. Su ◽  
S. R. Calciu
Keyword(s):  
Magnetic Field ◽  
High Efficiency ◽  
Guided Wave ◽  
Bias Magnetic Field

Study on High Efficiency Energy Harvesting Using Piezoelectric Coupled Beam With Self-Tuning Process

2015 ◽  
Author(s):  
Yukun Cheng ◽  
Nan Wu ◽  
Shengjie Zhao
Keyword(s):  
Energy Harvesting ◽  
Axial Force ◽  
High Efficiency ◽  
Frequency Tuning ◽  
Excitation Frequency ◽  
Iteration Process ◽  
The Self ◽  
Piezoelectric Layers ◽  
Self Tuning ◽  
Tuning Process

Studies on renewable energy harvesting have experienced significant growth due to the increasing demand of portable electronic devices and wireless sensor networks. We introduce the first time a beam energy harvester coupled with piezoelectric layers and stack actuators subjected to harmonic base excitation for achieving efficiency energy harvesting with a new developed self-frequency-tuning process. The self-frequency-tuning process of the harvester is realized by an adjustable axial force, which is generated by a piezoelectric stack actuator, through a feedback filtering electrical circuit. By the feedback filtering circuit, the value of axial force is determined by the amplitude of the output voltage generated on piezoelectric layers to tune the first natural frequency of the beam harvester close to the excitation frequency leading to a resonance of the harvester system. To describe and simulate the energy harvesting and the self-tuning process, a mathematical model is presented to calculate the dynamic response of the harvester as well as the output electric charge and voltage from piezoelectric layers for adjusting the axial force. It is noted that an iteration process is indispensable for the tuning process because of the transient nature of the vibrating system. A novel iteration numerical model is hence developed, and the whole energy harvesting process is divided into many short periods to represent the iteration steps and the self-tuning process. From numerical simulations, it shows that the self-tuning process helps increase the efficiency of the harvester, especially when the harvester is tuned close to its resonant state.

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