Kabushiki Kaisha Toshiba

Masahiro Kuroda

Tomokazu Harada

Tadahiro Nakayama

Shinichi Kominato

Akiyuki Yokoyama

Yoshinori Saito

Tomiya Sasaki

Yuichi Kasuya

Tetsuyuki Takanashi

A permanent magnet type motor comprising a rotor main body rotatably supported with respect to a stationary member, a rotor which is provided on an outer periphery face of the rotor main body and which is arranged such that S poles and N poles of a plurality of permanent magnets are provided alternately, a stator composed of a stator core arranged at the outer periphery side or inner periphery side of the rotor, the stator core having winding storage sections, and stator windings stored in the winding storage sections, a sensor fixed to the stationary member so as to be proximal to the permanent magnets, the sensor detecting a position of the permanent magnets, a detection target member having a detector for detecting a magnetic resistance change portion formed on the rotor main body, and a rotational position detecting magnetic sensor arranged at the stationary member.

Permanent magnet type motor and X-ray computed tomography apparatus

Permanent magnet type motor and x-ray computed tomography apparatus

An X-ray CT apparatus includes a pair of an involute gear and a magnetic sensor as a structure for detecting the rotation of the gantry rotary section in a non-contact fashion. The involute gear imparts a periodic change in the magnetic flux in the circumferential direction of a circle coaxial with the gantry rotary section. The magnetic sensor including the magnet and the magnetic reluctance (MR) elements detects the change in the magnetic flux caused by the rotation of the involute gear together with the gantry rotary section to generate a pulse signal conforming with the change in the magnetic flux. The pulse signal obtained from the magnetic sensor is supplied to the servo amplifier, the CT main control section, etc. via the signal processing unit.

X-ray CT apparatus

Growing community of inventors

Yokohama, Japan

Masahiro Kuroda