Pitch system for a wind turbine blade

A pitch system for rotating a blade of a wind turbine relative to a hub, the pitch system comprising:

• a blade bearing including an inner bearing ring and an outer bearing ring, wherein the outer bearing ring is rotatable relative to the inner bearing ring, and
• an actuator system configured to control relative rotational movement between the inner bearing ring and outer bearing ring, comprising:
• a first load transfer beam arrangement spanning at least first and second fixing positions associated with the inner bearing ring,
• a second load transfer beam arrangement spanning at least first and second fixing positions associated with the outer bearing ring, and
• a first linear actuator coupled between the first load transfer beam arrangement and the second load transfer beam arrangement,
• wherein the second load transfer beam arrangement is connected to the outer bearing ring at the first and second fixing positions by respective first and second mounting brackets, and
• wherein the outer bearing ring defines a recessed section which mates with a base part of the respective first or second mounting brackets so that an upper surface of the base part is flush with an adjacent surface of the outer bearing ring.

A pitch system for rotating a blade of a wind turbine relative to a hub, the pitch system comprising:

• a blade bearing including an inner bearing ring and an outer bearing ring, wherein the outer bearing ring is rotatable relative to the inner bearing ring, and
• an actuator system configured to control relative rotational movement between the inner bearing ring and outer bearing ring, comprising:
• a first load transfer beam arrangement spanning at least first and second fixing positions associated with the inner bearing ring,
• a second load transfer beam arrangement spanning at least first and second fixing positions associated with the outer bearing ring, and
• a first linear actuator coupled between the first load transfer beam arrangement and the second load transfer beam arrangement,
• wherein the first load transfer beam arrangement comprises a first beam section and a second beam section, and
• wherein the second load transfer beam arrangement extends between the first and second beam sections.

A pitch system for rotating a blade of a wind turbine relative to a hub, the pitch system comprising:

• a blade bearing including an inner bearing ring and an outer bearing ring, wherein the outer bearing ring is rotatable relative to the inner bearing ring, and
• an actuator system configured to control relative rotational movement between the inner bearing ring and outer bearing ring, comprising:
• a first load transfer beam arrangement spanning at least first and second fixing positions associated with the inner bearing ring,
• a second load transfer beam arrangement spanning at least first and second fixing positions associated with the outer bearing ring, and
• a first linear actuator coupled between the first load transfer beam arrangement and the second load transfer beam arrangement,
• wherein the first load transfer beam arrangement comprises a first beam section and a second beam section, and
• wherein the first linear actuator is positioned between the first and second beam sections.

A pitch system for rotating a blade of a wind turbine relative to a hub, the pitch system comprising:

• a blade bearing including an inner bearing ring and an outer bearing ring, wherein the outer bearing ring is rotatable relative to the inner bearing ring, and
• an actuator system configured to control relative rotational movement between the inner bearing ring and outer bearing ring, comprising:
• a first load transfer beam arrangement spanning at least first and second fixing positions associated with the inner bearing ring,
• a second load transfer beam arrangement spanning at least first and second fixing positions associated with the outer bearing ring, and
• a first linear actuator coupled between the first load transfer beam arrangement and the second load transfer beam arrangement,
• wherein the first load transfer beam arrangement is connected to the inner bearing ring at the first and second fixing positions by respective first and second mounting brackets, and
• wherein the first load transfer beam arrangement is connected to at least one of the first and second mounting brackets by a respective beam coupling having at least a rotational degree of freedom about a longitudinal axis between the first and second fixing positions associated with the inner bearing ring.