Daikin Industries, Ltd.

Tomomi Sakamoto

Atsushi Suhara

Takahiro Abe

Kazuhisa Shigemori

Masakazu Yoshida

Yoshinari Asano

Tomoaki Ueda

Kenji Masuda

Hirofumi Higashi

Yusuke Irino

Masanori Hasegawa

Ryuuji Akiyama

Yoshiyuki Harada

Hiroyuki Ikegami

Nobuyuki Kifuji

Shintarou Araki

Kaori Tosa

Hiroshi Yagi

Kouichi Yamamoto

Yoshiyuki Hama

Yuzou Sawada

A hydroelectric power generation system includes a water turbine, a generator connected to the water turbine, and a controller. The water turbine is arranged in a flow path through which a fluid flows. The controller performs a pressure control by controlling the generator to regulate a pressure of the fluid downstream of the water turbine. The pressure control includes a first control regulating the pressure in parallel with a regenerative operation of the generator, and a second control regulating the pressure in parallel with a power running operation of the generator.

Hydroelectric power generation system

A hydraulic power generation system is provided with a control unit which controls the power supply circuit to perform a normal operation of supplying power from the power system to a predetermined electric device provided at the water channel and an autonomous operation of supplying the power generated by the electric generator to the electric device. The control unit executes the autonomous operation when the power system fails.

A hydroelectric generation system includes a fluid machine disposed in a penstock or channel, a generator driven by the fluid machine, and a control unit configured to generate a predetermined torque in the generator. Fluid flows through the penstock or channel. The penstock or channel has a main path in which the fluid machine is disposed, and a detour disposed in parallel with the main path. The detour includes an on-off valve. The on-off valve is opened when not electrified, and closed when electrified.

Hydroelectric system

A control device estimates a flow rate and an effective height difference of a fluid machine based on a characteristic detectable with regard to a rotating electrical machine and correlating with the flow rate and the effective height difference of the fluid machine. A total flow rate in a pipe system is estimated based on these values estimated by the control device and a flow resistance characteristic line, and cooperative control of the fluid machine and the flow rate control valve is performed such that the estimated value of the total flow rate becomes close to a target flow rate of the total flow rate in the pipe system.

Fluid system

A fluid device having a fluid machine and a rotary electric machine includes a fluid machine and a rotary electric machine connected to a rotating shaft of the fluid machine. A cooler is arranged for carrying out liquid-cooling using a fluid of a cooling pipe connecting an upstream portion and a downstream portion of the fluid machine to bypass the fluid machine. The fluid machine and the rotary electric machine are detachably coupled to each other. Hence, the rotary electric machine can enhance the cooling performance for the rotary electric machine and reduce its size, achieving improvements in maintainability and serviceability.

Fluid device

At a time of a heating high-load operation, a harmonic current is flown in an armature winding to induction-heat rare-earth magnets, thus reducing a residual magnetic flux density. Thereby, the number of rotations of a radial gap type motor is improved. The rare-earth magnets are provided near a cooling medium passage extending substantially in parallel with a flow line of a cooling medium, so that the cooling medium recovers heat of the heated rare-earth magnets. At a time of a cooling high-load operation, a greater number of rotations are obtained with respect to the same torque command value, by a field weakening control by means of a current-phase advance.

Air conditioner, air conditioner manufacturing method, and compressor

Optical measurement apparatus and method therefor

Reaction vessel for optical measurement

Growing community of inventors

Osaka, Japan

Tomomi Sakamoto