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This paper presents a radial position control method of bearingless motor (BELM) based on d-q axis current control and an integrated winding arrangement. The BELM performs the functions of motor as well as magnetic bearing. Rotor is suspended with non-contact by suspension force. In a conventional BELM, there are two kinds of stator windings such as motor and suspension windings. The motor winding...
Since the propulsion mechanism in fluid using an elastic fin, such as the caudal fin or the pectoral fin of fish, is effective. However, the optimum elasticity of the fin is not constant and changes with the movement task and environment. It is very difficult to exchange fins of different stiffness while the robot is swimming. Thus, we attempt to develop a variable-stiffness fin with a variable-effective-length...
A power assist system for automobile slide doors that can provide comfortable operational feelings has been developed. The system incorporates a reference door model having preferable operational feelings. In order to follow virtual motion of the ideal door, both feedforward- and feedback-controllers are employed to drive a power assisting motor. Simulations and experiments have proved that the motion...
A new method, previously reported, for fabricating optical diffraction gratings involves writing a periodic magnetic pattern in a magnetic memory medium and using a magnetic fluid as magnetic toner to render the pattern visible. Using this method, an optical grating can easily be prepared even on convex and concave surfaces. Because the optical characteristics of such relief-type gratings are determined...
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