Hitachi, Ltd.

Yokogawa Electric Corporation

Shotaro Shindo

Koichi Sato

Yutaka Ono

Yasuhiko Muramatsu

Mitsuhiro Nikaido

Haruo Higuchi

Shigeru Hashida

Yoichi Kikukawa

Hideo Banzai

Hiroyuki Shinomiya

In order to provide an X-ray CT apparatus which reduces a waiting time period until irradiation with X-rays is permitted with a simple configuration without detecting a rotation speed of an anode, a controller () selects a rating anode rotation speed among a plurality of types thereof depending on an X-ray irradiation condition, and supplies driving power for realizing the selected rating anode rotation speed to a stator coil () from a starter circuit (). The controller () obtains time required to reach an irradiation possible rotation speed which is lower than the rating anode rotation speed and is required to apply X-rays in an X-ray irradiation condition. If arrival time has elapsed, irradiation with X-rays is permitted. Consequently, it is possible to reduce a waiting time period in which an operator waits for an anode rotation speed to rise.

X-ray CT apparatus, X-ray high-voltage device, and X-ray scanning device

A motor drive system used with industrial robots, processing machines, and the like comprising an external interface part ready for connecting a plurality of kinds of host controllers generating a command signal; a sensor interface part to which a motor rotation detecting sensor is connected; a main control part operating for feedback control of a motor according to signals provided by way of the interfaces; and a power amplification part for feeding a current to motor coils according to a control signal from the main control part and wherein the external interface part, the sensor interface part, the main control part, and the power amplification part are separate and modularized as cards. Advantageously, the various controllers, sensors and power systems are changeable to flexibly meet different user requirements.

Motor drive system

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Tokyo, Japan

Shotaro Shindo