Mitsubishi Heavy Industries Compressor Corporation

Hideki Tonaka

Naoyuki Nagai

Makoto Katagake

Hiroyuki Miyata

Yoshiyuki Okamoto

Tomoaki Okamura

Yoshitaka Hamamoto

Naruhito Harada

There is provided a variable speed increaser including a planetary gear transmission device which changes the speed of a rotational driving force of the electric driving device and transmits the changed rotation driving force to a driving target, and a rotation rate controller. The electric driving device includes a constant-speed motor having a constant-speed rotor, and a variable-speed motor having a variable-speed rotor and driven in a regenerative mode and in a power mode. A rotation rate of the output shaft varies within an operation range between a maximum rotation rate and a minimum rotation rate. The constant-speed motor has a rated torque which allows the output shaft to have the maximum rotation rate by itself. The rotation rate controller changes the rotation rate of the output shaft rotating within the operation range by driving the variable-speed motor only in the regenerative mode.

Variable speed increaser and control method thereof

A linear motion mechanism, including a drive portion, a screw shaft which is rotationally driven about an axis by the drive portion and in which a first spiral screw groove is formed on an outer peripheral surface, a nut in which a second spiral screw groove facing the first screw groove is formed on an inner peripheral surface and which moves forward or backward relative to the screw shaft in an axial direction, in which an axis of the screw shaft extends, according to a rotation of the screw shaft, a plurality of load balls which are disposed in a transfer path formed by the first screw groove and the second screw groove and advance while rolling on the transfer path, a plurality of retainer frames which are disposed between the plurality of load balls and advances on the transfer path along with the load balls.

Linear motion mechanism, valve device, and steam turbine

A linear motion mechanism () is provided with: a cylinder rod () into which a ball screw () can be inserted, said cylinder rod () including a base end section that is connected to a nut () within a piston casing () and a tip section () that is exposed on the outside of the piston casing (); a nut-side grease supply hole () that is formed in the nut () and that includes a discharge port () that opens toward the outer circumferential surface of the ball screw (); and a cylinder rod-side grease supply hole () that is formed in the cylinder rod (), that includes on one end thereof an inlet () that opens at a position that is exposed to the outer section of the piston casing (), and that includes another end () that is connected to the nut-side grease supply hole ().

Linear motion mechanism, governing valve drive device, and steam turbine

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Tokyo, Japan

Hideki Tonaka