# US 2025/0146474 A1 · Test rig for a wind turbine blade bearing

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- Number: US 2025/0146474 A1
- Document ID: US20250146474A1
- Status: Published application
- Kind: A1
- Application number: 18/935,090
- Filed: 2024-11-01
- Published: 2025-05-08
- Earliest claimed: 2023-11-07
- Assignees: Siemens Gamesa Renewable Energy A/S
- Applicants: Siemens Gamesa Renewable Energy A/S
- Inventors: Martin Fritze; Mike Juul Olsen; Morten Ankjaer Simonsen
- Web page: https://patentgrep.com/patent/US20250146474A1

## CPC

- F03D 17/032: {Bearings}
- G01M 5/0016: {of aircraft wings or blades}
- F03D 17/011: {for monitoring mechanical loads or assessing fatigue; for monitoring structural integrity}
- G01M 13/04: Bearings
- F05B 2260/83: Testing, e.g. methods, components or tools therefor
- F03D: WIND MOTORS
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- 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

## Abstract

A test rig for testing a blade bearing of a wind turbine blade is provided. The blade bearing includes a first part and a second part that is rotatable about an axial direction with respect to the first part. The test rig includes a bearing support, which is configured to be mounted to the first part of the blade bearing, a shaft element, which is configured to be mounted to the second part of the blade bearing and able to rotate with respect to the bearing support. A test load unit is configured to apply a load in the axial direction to the shaft element. The test load unit includes at least one actuator that is controllable to apply the load.

## Claims

### Claim 1

A test rig for testing a blade bearing of a wind turbine blade, wherein the blade bearing comprises a first part and a second part that is rotatable about an axial direction with respect to the first part, wherein the test rig comprises:
a bearing support configured to be mounted to the first part of the blade bearing;
a shaft element configured to be mounted to the second part of the blade bearing, wherein the shaft element is rotatable with respect to the bearing support; and
a test load unit configured to apply a load in the axial direction to the shaft element, wherein the shaft element is configured to at least partly transfer a load to the blade bearing, wherein the test load unit comprises at least one actuator that is controllable to apply the load.

### Claim 2 (depends on 1)

The test rig according to claim 1, wherein the test rig is configured to confine the load to be applied to the blade bearing by the test load unit to the test rig.

### Claim 3 (depends on 1)

The test rig according to claim 1, wherein the bearing support comprises at least one mount to which the at least one actuator is mounted, or wherein the bearing support is mounted to a frame, wherein the frame comprises at least one mount to which the at least one actuator is mounted.

### Claim 4 (depends on 1)

The test rig of claim 1, wherein the bearing support is a wind turbine component.

### Claim 5 (depends on 1)

The test rig of claim 1, wherein the bearing support comprises or is a rotor hub of a wind turbine.

### Claim 6 (depends on 5)

The test rig of claim 5, wherein the test rig comprises a frame, the hub being mounted to the frame, wherein the at least one actuator is mounted to the frame and acts between the test load unit and the frame.

### Claim 7 (depends on 1)

The test rig of claim 1, wherein the test load unit comprises a load transfer component, wherein the at least one actuator is mounted to the load transfer component to apply a load to the load transfer component, and wherein the load transfer component is configured to transfer the applied load to the shaft element.

### Claim 8 (depends on 7)

The test rig of claim 7, wherein the shaft element is rotatable with respect to the load transfer component.

### Claim 9 (depends on 7)

The test rig of claim 7, wherein the load transfer component is configured to be mounted to a first part of a second blade bearing to be tested, the second blade bearing having a second part rotatable with respect to the first part, wherein a second end of the shaft element is configured to be mounted to the second part of the second blade bearing, the second end of the shaft element being opposite to a first end of the shaft element to which the second part of the first blade bearing is to be mounted.

### Claim 10 (depends on 9)

The test rig of claim 9, wherein the test rig comprises at least two test load units and at least two respective shaft elements, wherein each test load unit is configured to apply a load via the respective shaft element to a blade bearing to be tested, wherein the bearing support is configured to be mounted to the first part of each of the at least two blade bearings to be tested.

### Claim 11 (depends on 1)

The test rig of claim 1, wherein the bearing support is a rotor hub of a wind turbine, wherein the rotor hub comprises three blade mounts, wherein one, two, or each of the blade mounts is configured to be mounted to the first part of a respective blade bearing to be tested, wherein the test rig comprises one, two, or three respective test load units and corresponding shaft elements, each test load unit being configured to apply a load via the respective shaft element to the respective blade bearing to be tested.

### Claim 12 (depends on 1)

The test rig of claim 1, wherein the test load unit comprises at least two actuators mounted on opposite sides of a load transfer component that is configured to transfer the load applied by the at least two actuators to the shaft element.

### Claim 13 (depends on 1)

The test rig of claim 1, further comprising a controller configured to control the at least one actuator to apply a predetermined load to the shaft element to test a blade bearing.

### Claim 14 (depends on 1)

The device of claim 1, wherein the test rig comprises a pivoting mechanism for inserting a blade bearing to be tested into the test rig, wherein the pivoting mechanism is configured to allow a pivoting of at least a part of the test load unit into a horizontal orientation to allow the shaft element and at least one blade bearing to be tested to be mounted to the test load unit.

### Claim 15

A method of testing a blade bearing of a wind turbine blade using a test rig, wherein the blade bearing comprises a first part and a second part that is rotatable about an axial direction with respect to the first part, wherein the test rig comprises a bearing support configured to be mounted to the first part of the blade bearing; a shaft element configured to be mounted to the second part of the blade bearing, wherein the shaft element is rotatable with respect to the bearing support; and a test load unit configured to apply a load in the axial direction to the shaft element, wherein the test load unit comprises at least one actuator, wherein the method comprises:
testing the blade bearing by rotating the second part of the blade bearing with respect to the bearing support and controlling the actuator to apply a load in the axial direction to the blade bearing via the shaft element while the blade bearing is being rotated.