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Exploitation of the renewable energy is expected one of the most effective expedient to reduce of green house gas emissions, principally CO2. In this context, small-sized hydraulic power generation is considered one effective method because of its potential energy amount. However, mechanical bearing which support the rotor shaft causes rotational loss and durability limitation. For the purpose of...
Lead batteries are used mainly for energy storage. However, they are using chemicals and heavy materials, which will affect to environment badly. Therefore, clean energy storage systems are under development using magnetic bearing. However, eddy current causes serious rotational loss for energy storage. Therefore, Lorentz force type magnetic bearing is proposed. Rotational losses are expected to be...
Several types of interior permanent magnet synchronous motor have been utilized in the wide rage of applications. The characteristics of their cogging torque and average torque and d and q- axis inductance were clarified for the different shapes of rotor magnet and two types of stator windings. This paper clarifies the characteristics of radial attractive force and vibration for the different shapes...
The magnetooptic recording characteristics of three types of DyFeCo films with a quadrilayer structure were measured using three recording methods: optical modulation, magnetic field modulation and the laser-off method. In the laser-off method, the laser power was lowered only while the magnetic field was changing. The transition metal (TM)-rich medium had the best carrier-to-noise (C/N) ratio when...
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