Nabtesco Corporation

Teijin Seiki Co., Ltd.

Osamu Nohara

Hirofumi Komori

Yuichi Asakawa

Haruna Osako

Katsuhiko Yokoyama

Shigeru Hosoda

Sadayuki Tanabe

Masataka Hashimoto

Kei Kato

Hiroshi Hibino

A braking force measuring method for a wind turbine is provided. The wind turbine includes a ring gear, a yaw drive device driving a pinion meshing with the ring gear to make the wind turbine turn, and a brake device that prevents the nacelle from turning in the yaw direction by pressing a friction body against the ring gear. The method includes: braking the ring gear by the brake device; measuring a load on a rotating shaft of the pinion that mesh with the braked ring gear; determining a maximum value of the load during a time period when input torque is applied to the pinion, the input torque being applied with the nacelle held still and until the friction body begins to slip and the nacelle begins to turn in the yaw direction; and converting the determined load to the braking force.

Braking force measuring method

A wind power generation device control system includes: a blade wind detecting device for detecting at least one of a wind direction or a wind speed on at least one blade of a wind power generation device; and a blade control device for controlling at least one of (i) a pitch angle of the at least one blade or (ii) a yaw angle of the wind power generation device, based on at least one of the wind direction or the wind speed detected by the blade wind detecting device.

Wind power generation device control system and blade wind detecting device

A backlash measuring method is provided for measuring backlash at a plurality of different times. The backlash measuring method includes: a rotation amount calculating step of braking a ring gear relative to a second portion while contact between a target tooth and the ring gear achieved in a contacting step is maintained, causing a target pinion to rotate toward a second side in a rotation direction opposite to the first side with a driving force less than a braking force applied to brake the ring gear relative to the second portion until the target tooth touches the ring gear at a tooth surface facing the second side, and calculating an amount of rotation of the target pinion; and a measuring step of measuring backlash between the ring gear and the target pinion based on the amount of rotation of the target pinion calculated in the rotation amount calculating step.

Backlash measuring method, wind turbine diagnosing method, and backlash measuring apparatus

A wind turbine drive control device according to one aspect of the present invention is a wind turbine drive control device for controlling at least one drive device for moving two structures included in a wind power generation device relative to each other, the wind turbine drive control device including: an obtaining unit for obtaining information related to a load occurring between the at least one drive device and one of the two structures that receives a force generated by the at least one drive device; and a control unit for controlling the at least one drive device so as to cause a force generated by the at least one drive device to be reduced or zero based on the information related to the load obtained by the obtaining unit during a stop period in which the two structures are stopped relative to each other.

Wind turbine drive control device and control method of wind turbine drive

A wind turbine system includes: a ring gear; a yaw drive unit including a pinion gear meshing with the ring gear, the yaw drive unit being configured to rotate the pinion gear; a yaw brake unit configured to generate a braking force for inhibiting rotation of the ring gear; a load information acquiring unit configured to acquire an external load applied to the ring gear; and a control unit configured to release the braking force of the yaw brake unit when a rotational torque generated on the ring gear by the yaw drive unit has been larger than the external load acquired by the load information acquiring unit, in switching the ring gear from a stationary state to a rotating state.

Wind turbine system, wind turbine control device, driving method, and tangible computer-readable storage medium storing program

A wind turbine drive system includes a plurality of drive devices, a state quantity detection unit, and a control unit. The plurality of drive devices are provided in a first structure (a nacelle), and a ring gear is provided in a second structure (a tower). Each of the drive devices includes a motor drive portion, a speed reducing portion, and a motor braking portion for braking the motor drive portion. The state quantity detection unit detects a load between a meshing portion of each of the drive devices and the ring gear. Based on the thus detected load for the each of the drive devices, the control unit controls at least one of the motor drive portion and the motor braking portion so as to reduce a degree of variation in the load among the drive devices.

Wind turbine drive system and wind turbine

Wind turbine drive control device and control method of wind turbine drive device

One object is to promptly and accurately sense an abnormal state of a wind turbine driving device. The wind turbine driving device includes a driving device body and a sensor. The driving device body is installed in one structure at a movable section of a wind turbine. The driving device body includes a meshing portion meshing with a ring gear installed in the other structure at the movable section of the wind turbine. The sensor measures a change in installation state of the driving device body with respect to the one structure.

Wind turbine driving device, wind turbine driving device unit, and wind turbine

Damage to a driving device or a ring gear or both due to an excessive force at a meshing portion therebetween is effectively prevented. In the embodiment described above, a driving device includes a driving device body that is provided in one structure at a movable section of a wind turbine and has a drive gear meshing with a ring gear provided in the other structure at the movable section, and an abnormality detection unit that monitors a force generated between the ring gear and the drive gear or the state of the driving device body or monitors both of the face and the state. Output from the drive gear of the driving device body to the ring gear is stopped when the abnormality detection unit detected an abnormality.

Driving device, driving device unit and wind turbine

A rotation driving mechanism for windmill () includes an annular track part (), a rotation driving part (), and a plurality of swinging parts (). The annular track part () is disposed on one of a base-side structure and a rotation-side structure, and has a track wall part () and first teeth (). The rotation driving part () is fixed on the other of the base-side structure and the rotation-side structure. Each swinging part () has a swinging part body () and second teeth (). When a rotating shaft () of the rotation driving part () is rotated so that the swinging parts () are swung with maintaining a predetermined phase difference thereamong, the swinging parts () are relatively moved with respect to the annular track part ().

Rotation driving mechanism for windmill

A rotation driving mechanism for windmill () includes an annular track part (), a rotation driving part (), and a plurality of swinging parts (). The annular track part () is disposed on one of a base-side structure and a rotation-side structure, and has a circumferential wall part () and first teeth (). The rotation driving part () is fixed on the other of the base-side structure and the rotation-side structure. Each swinging part () has a swinging part body (a) and second teeth (b). When a rotating shaft () of the rotation driving part () is rotated so that the swinging parts () are swung with maintaining a predetermined phase difference thereamong, the swinging parts () are relatively moved with respect to the annular track part ().

A yaw drive method of a wind power generation apparatus, in which a second gear engaged with a first gear attached to one of tower or a wind power generation unit supported to the upper end of the tower so as to be capable of yawing and supported to a tower or to the upper end of the tower is rotated by a drive motor attached to the other of the tower or the wind power generation unit for yawing the wind power generation unit. A drive energy, which is supplied to the drive motor for a predetermined time from when the supply of the drive energy to the drive motor begins to start, is made to be smaller than the drive energy supplied to the drive motor in a common yawing.

Speed reducer for use in yaw drive apparatus for wind power generation apparatus, and yaw drive method and apparatus for wind power generation apparatus using the speed reducer

A speed reducer has a crankshaft to be rotated in conjunction with a drive unit. First through third eccentric portions are provided on the crankshaft. First through third externally-toothed gears are adapted to be moved respectively in conjunction with the first through third eccentric portions. Pin teeth are disposed along an inner periphery of a case to allow each of the first, second and third externally-toothed gears to be in meshing engagement therewith. An output shaft unit is adapted to be rotated in conjunction with the first, second and third externally-toothed gears. The first, second and third eccentric portions are arranged with a given phase difference in a rotation direction of the crankshaft with respect to each other. Each of the first, second and third externally-toothed gears is in meshing engagement with less than half of the plurality of pin teeth.

Speed reducer, production method for speed reducer, roller bearing, crankshaft and production method for crank shaft

When the load acting on a fluid motor ( ) increases, a changeover valve ( ) starts to be changed over toward a low-speed position L, but at this time an additional pilot fluid whose pressure is determined by the amount of fluid flowing into or out of a second passage ( ) through first and second notches functions as a pressure regulator for a spool ( ), and lowers the pressure within the second passage ( ) without lowering the pressure within a high pressure-side main circuit ( ), thereby tilting a swash plate ( ) from a position of high-speed rotation to a position of low-speed rotation.

Drive circuit for fluid motor

Axial positions of two driven external gears making up each of a plurality of paired-gear groups with respect to an input shaft are made identical, and a different paired-gear group is arranged by being offset in the axial direction of the input shaft . Therefore, only two driven external gears making up the paired-gear group are present at an identical axial position of the input shaft . Consequently, even if the diameters of these driven external gears are made large up to the very limit, these driven external gears do not interfere with each other. Accordingly, it is possible to readily enlarge the reduction ratio based on the driving and driven external gears and

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Gifu, Japan

Osamu Nohara