# US 11,905,930 B2 · Output device, condition monitoring device, wind turbine, output method, condition monitoring method and non-transitory computer-readable storage medium storing program

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- Number: US 11,905,930 B2
- Document ID: US11905930B2
- Status: Granted
- Kind: B2
- Application number: 17/466,687
- Filed: 2021-09-03
- Published: 2022-03-10
- Granted: 2024-02-20
- Earliest claimed: 2020-09-04
- Assignees: Nabtesco Corporation
- Applicants: Nabtesco Corporation
- Inventors: Yuichi Asakawa
- Web page: https://patentgrep.com/patent/US11905930B2

## CPC

- F03D 7/0248: {by mechanical means acting on the power train}
- F03D 7/0204: {for orientation in relation to wind direction}
- F03D 7/0208: {Orientating out of wind}
- F03D 7/022: {Adjusting aerodynamic properties of the blades}
- F03D 7/0264: {for stopping; controlling in emergency situations (orientating out of wind F03D7/0208)}
- F03D 7/028: {controlling wind motor output power}
- F03D 17/00: Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30)
- F05B 2260/80: Diagnostics
- F05B 2260/902: using frictional mechanical forces
- F05B 2260/903: using electrical or magnetic forces
- F05B 2270/331: Mechanical loads
- F05B 2270/332: Maximum loads or fatigue criteria
- F05B 2270/602: electrical actuators
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- F03D: WIND MOTORS
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

For each of actuators, the partial load ratio is output. An output device for a drive device of a wind turbine includes an obtaining unit for obtaining information relating to a load applied to each of a plurality of actuators, where the actuators are included in the drive device of the wind turbine and configured to cooperate with each other, a processing unit for, based on the information obtained by the obtaining unit, calculating a partial load ratio, where the partial load ratio represents a ratio of a load on each of the actuators to a total load and the total load is a sum of the loads on the respective actuators, and an output unit for outputting the partial load ratio.

## Claims

### Claim 1

A condition monitoring device for a drive device of a wind turbine, the condition monitoring device comprising:
one or more sensors, the one or more sensors operatively connected to the drive device of the wind turbine and configured to sense information relating to a load applied to each of a plurality of actuators, the plurality of actuators being included in the drive device of the wind turbine and configured to cooperate with each other;
a brake configured to apply a braking force to the plurality of actuators;
a controller having a processor, the controller operatively connected to the drive device of the wind turbine and the one or more sensors, the controller being configured to:
obtain the information from the one or more sensors;
based on the obtained information, calculate a partial load ratio, the partial load ratio representing a ratio of the load on each of the plurality of actuators to a total load, the total load being a sum of the loads on the plurality of actuators;
diagnose a condition of each of the plurality of actuators based on the total load and the calculated partial load ratio;
determine an action to be taken based on the diagnosed condition; and
control the brake based on the diagnosed condition.

### Claim 2 (depends on 1)

The condition monitoring device of claim 1, wherein the one or more sensors includes a torque sensor.

### Claim 3 (depends on 2)

The condition monitoring device of claim 2, further comprises a display configured to display the obtained information using a graph plotted by taking the partial load ratio along an axis and the total load along another axis.

### Claim 4 (depends on 3)

The condition monitoring device of claim 3, wherein the display is configured to display on the graph a line indicating an upper limit of an allowable partial load ratio for each of the plurality of actuators determined by the total load.

### Claim 5 (depends on 1)

The condition monitoring device of claim 1, further comprises a display configured to display the obtained information using a graph plotted by taking the partial load ratio along an axis and the total load along another axis.

### Claim 6 (depends on 5)

The condition monitoring device of claim 5, wherein the display is configured to display on the graph a line indicating an upper limit of an allowable partial load ratio for each of the plurality of actuators determined by the total load.

### Claim 7

A wind turbine comprising:
a drive device including a plurality of actuators configured to cooperate with each other;
a wind turbine body including a moving part configured to be driven by the drive device; and
a condition monitoring device for the drive device of the wind turbine, the condition monitoring device including:
one or more sensors, the one or more sensors operatively connected to the drive device of the wind turbine and configured to sense information relating to a load applied to each of the plurality of actuators;
a controller having a processor, the controller operatively connected to the drive device of the wind turbine and the one or more sensors, the controller being configured to:
obtain the information relating to a load applied to each of the plurality of actuators;
based on the obtained information, calculate a partial load ratio, the partial load ratio representing a ratio of a load on each of the plurality of actuators to a total load, the total load being a sum of the loads on the plurality of actuators;
diagnose a condition of the drive device based on the partial load ratio; and
control the drive device based on the diagnosed condition.

### Claim 8

A condition monitoring method for a drive device of a wind turbine, the condition monitoring method comprising steps of:
obtaining information relating to a load applied to each of a plurality of actuators, the plurality of actuators being included in the drive device of the wind turbine and configured to cooperate with each other;
based on the information obtained in the obtaining step, calculating a partial load ratio, the partial load ratio representing a ratio of a load on each of the plurality of actuators to a total load, the total load being a sum of the loads on the plurality of actuators; and
diagnosing a condition of each of the plurality of actuators based on the total load and the partial load ratio calculated in the calculating step; and
based on a diagnosis made in the diagnosing step, controlling the drive device of the wind turbine.

### Claim 9 (depends on 8)

The condition monitoring method of claim 8, wherein, in the controlling step, a brake for applying a brake force to the plurality of actuators is controlled based on the diagnosis made in the diagnosing step.