Abstract
The purpose of this study is to develop a miniature motor for directional adjustment of a vascular endoscopic camera. Spherical ultrasonic motor not affected by magnetic fields is used in the miniature motor. The characteristic of spherical ultrasonic motor is that one motor has multi degree of freedom in rotational direction. Wire is used as stator to realize miniaturization of the motor, so it is called miniature spherical ultrasonic motor using wire stators. Firstly, the pressing force between a stator and a spherical rotor is discussed, which is important for developing a miniature spherical ultrasonic motor using wire stators. As a result, it can be clarified that there is an optimum value for the pressing force. Secondly, the starting torque is investigated, which is one characteristic of the miniature spherical ultrasonic motor using wire stators. The relationship between the frequency and amplitude of the applied AC voltage and the starting torque is clarified. Finally, the control method of the rotational direction of a miniature spherical ultrasonic motor using wire stators is discussed. A PWM control method is proposed to control the rotational direction of an ultrasonic motor. In this PWM control, traveling wave and standing wave generated on a wire stator are used. Experimental results show that the proposed method is effective.
Highlights
The ischemic heart disease caused by arteriosclerosis occupies higher cause of death in the world
A miniature spherical ultrasonic motor using wire stators composed of spherical rotor, wire stator, waveguide, and vibration source is made
The case where the vibration source is connected to the outside waveguide is defined as forward rotation, and the case where the vibration source is connected to the inside waveguide is defined as reverse rotation
Summary
The ischemic heart disease caused by arteriosclerosis occupies higher cause of death in the world. Arteriosclerosis is caused by stenosis of the vascular lumen due to the hardening of blood vessels and the accumulation of plaque by aging. Angiography and intravascular ultrasound have been used for the examination and observation of the blood vessel. For comparison with angiography and intravascular ultrasound, it can be indicated that vascular endoscope is effective [5,6,7]. As the advantages of the vascular endoscope, there are three dimensional blood vessel surface, full color, and high resolution. As the disadvantage of the vascular endoscope, it can be mentioned that it is difficult to intercept blood flow and observe the blood vessel wall. It is difficult to photograph the lesion of the wall in the center of the image in the existing vascular endoscopic camera in the observation of the blood vessel lumen. In order to carry out the correct diagnosis, it can be desired to photograph the lesion in the center of the image
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