Northern Power Systems, Inc.

Northern Power Systems Utility Scale, Inc.

Robert H Rolland

Garrett Lee Bywaters

Jonathan A Lynch

Daniel P Costin

Clint C Coleman

Christopher M Bevington

William L Danforth

A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

Wind turbine/generator set and method of making same

Wind turbine/generator set having a stator cooling system located between stator frame and active coils

Wind turbine having a direct-drive drivetrain

A wind turbine () comprising an electrical generator () that includes a rotor assembly (). A wind rotor () that includes a wind rotor hub () is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle () via a bearing assembly (). The wind rotor hub includes an opening () having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity () inside the wind rotor hub. The spindle is attached to a turret () supported by a tower (). Each of the spindle, turret and tower has an interior cavity () that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system () for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

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Waitsfield, VT, United States of America

Robert H Rolland