公开(公告)号：US20190072065A1

公开(公告)日：2019-03-07

申请号：US16079841

申请日：2017-02-01

Applicant: NTN CORPORATION

Inventor： Tomoya KAWAI ,  Yoshio FUJIKAWA

IPC: F03B15/00 ,  F03B7/00 ,  F03B17/06

Abstract: A hydroelectric power generation apparatus includes a hydroelectric power generation module, a supporting part, and a bar. The hydroelectric power generation module includes a rotary blade and a power generator that generates power by rotation of the rotary blade. The supporting part supports the hydroelectric power generation module. The supporting part can be installed at a water channel. The bar is connected to the supporting part to protrude from the supporting part. With one end of the bar closer to the supporting part or a portion of the supporting part serving as a center, the other end of the bar opposite to one end of the bar can be pivoted to switch a first state to a second state and vice versa.

公开(公告)号：US20200277928A1

公开(公告)日：2020-09-03

申请号：US15998584

申请日：2017-01-23

Applicant: NTN CORPORATION

Inventor： Tomoya KAWAI ,  Yoshi FUJIKAWA

IPC: F03B13/10 ,  F03B11/00 ,  F03B7/00

Abstract: A hydroelectric power generation apparatus includes a hydroelectric power generation module, a beam as a supporting part, and a fixing part. The hydroelectric power generation module includes a rotary blade and a power generator that generates power by rotation of the rotary blade. The supporting part supports the hydroelectric power generation module. The fixing part fixes the supporting part to a water channel. The fixing part includes a bolt to press a surface of a wall portion of the water channel to fix the supporting part to the water channel. The hydroelectric power generation apparatus can dispense with a work performed around the water channel to install the apparatus and also be relocated easily and inexpensively.

公开(公告)号：US20190162162A1

公开(公告)日：2019-05-30

申请号：US16320743

申请日：2017-07-10

Applicant: NTN Corporation

Inventor： Yasuyuki FUJITA ,  Tomoya KAWAI

IPC: F03B15/06 ,  H02P9/04 ,  F03B11/08

Abstract: A control device performs a control process including the steps of: determining whether a predetermined condition has been established; when it has been determined that the predetermined condition has been established, clearing a counter; performing reverse rotation control; performing forward rotation control; incrementing the counter; and determining whether the counter's counted value has reached an upper limit.

公开(公告)号：US20170163167A1

公开(公告)日：2017-06-08

申请号：US15412970

申请日：2017-01-23

Applicant: NTN CORPORATION

Inventor： Masatoshi MIZUTANI ,  Hiroyuki NODA ,  Natsuhiko MORI ,  Tomoya KAWAI

IPC: H02M5/458 ,  H02J3/38

CPC classification number: H02M5/458 ,  H02J3/38 ,  H02J3/383 ,  H02M3/28 ,  H02M7/48

Abstract: This power transmission device is connected between an AC wiring system connected to an AC power supply, and a DC power supply, and transmits power from the DC power supply to the AC wiring system. The power transmission device includes an AC power supply voltage signal generator, a power converter, a DC voltage conversion unit, a switching element, and a switch open/close signal generator. The switch open/close signal generator includes: a control signal generation unit to generate a control signal formed from a pulse signal; and a pulse width determination unit to receive the control signal and generate a delayed signal obtained by delaying rising of the control signal, and when the delayed signal becomes a value corresponding to a magnitude of voltage of the AC power supply voltage signal, cause the control signal to fall, thereby making the control signal into the switch open/close signal.

公开(公告)号：US20180223792A1

公开(公告)日：2018-08-09

申请号：US15771997

申请日：2016-10-03

Applicant: NTN CORPORATION

Inventor： Yasuyuki FUJITA ,  Tomoya KAWAI

IPC: F03B15/16 ,  F03B11/00 ,  F03B17/06

CPC classification number: F03B15/16 ,  F03B11/008 ,  F03B11/08 ,  F03B13/22 ,  F03B13/264 ,  F03B15/18 ,  F03B17/061 ,  F03B17/062 ,  F05B2270/20 ,  F05B2270/327 ,  Y02E10/28

Abstract: A hydroelectric power generation apparatus includes a braking force generation unit configured to apply a braking force to rotation of a hydraulic turbine, and a controller configured to control the braking force generation unit to repeat increasing and decreasing the braking force to vary a rotational speed of the hydraulic turbine. Varying the rotational speed of the hydraulic turbine helps to flow away debris and the like adhering to hydraulic turbine blades. Preferably, the braking force generation unit includes an electrical, mechanical or fluid type braking device configured to apply a braking force to a rotary shaft of the hydraulic turbine. Preferably, the braking force generation unit includes a power generator configured to generate power through rotation of the hydraulic turbine, and the controller increases/decreases the braking force by varying power extracted from the power generator.