Research of the operation support arm corresponding to MRI using hollow type ultrasonic motor driving system

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An operation support arm control by lead screw system using hollow type ultrasonic motor. By using this system, slowdown gear is not needed and precise position control can be performed. Moreover, when it doesn't supply the power supply to the motor, it can use as fixed arm. Manufacturing this arm using titanium or duralumin, influence of the picture on MRI was reduced. The ultrasonic motor control circuit using the variable frequency which can perform precise positioning was developed.