Aktiebolaget Skf

Philips Lighting Holding B.v.

Jascha Van Pommeren

Koos Welling

Nicolaas Simon Willem Den Haak

Dennis Johannes Antonius Claessens

Laurens Verhulst

Yi Wang

Philip Louis Zulma Vael

Sait Izmit

Peter Klein Meuleman

Johannes Cornelis Theodorus Blom

Jan Wojciech Obrebski

Dennis Vervoorn

A circuit arrangement for controlling the brightness of at least one LED unit is described by the disclosure. The circuit arrangement, in one example, includes an input for receiving a phase-cut operating voltage from a power supply, a signal processor, connected with the input and adapted to provide a dimming signal for the at least one LED unit from the operating voltage. To allow an efficient reduction of noise in the dimming signal but simultaneously to allow an improved dimming of the LED unit, the signal processor are configured to operate at least in a noise suppression mode and a dimming mode. A control device is provided, connected with the signal processor and configured to set the mode of the signal processor in dependence of the variation in the operating voltage.

Circuit arrangement for controlling a LED unit and method of operating the same

A bearing system supports a plurality of turbine blades; each blade being rotatable about a pitch axis relative to a bearing system hub. The hub, comprising a plurality of static frames having a conical structure including two or more legs with openings therebetween, is connected to a main shaft of the turbine. Dynamic frames include a conical structure and two or more legs with openings therebetween. Legs of the static frame pass through openings between the legs of the corresponding dynamic frame, and legs of the dynamic frame pass through openings between legs of the corresponding static frame. Each dynamic frame is connected to one of the blades and is rotationally mounted to the corresponding static frame by a first bearing unit and a second bearing unit, distally arranged along the pitch axis from the first bearing unit. A central hub portion interconnects first shaft sections of the static frames.

Hub and bearing system and a turbine comprising the hub and bearing system

A bearing includes a first ring, a second ring, at least one row of rolling elements arranged in a rolling chamber disposed between the first ring and the second ring, and a cap attached to the first ring that is configured to close the rolling chamber. At least one vibration sensor is attached on the inside of the cap, and the vibration sensor is mounted in a metal block connected to the cap.

Capped bearing with vibration sensor

The invention resides in an assembly for rotationally supporting a wind turbine blade () relative to a wind turbine hub (). The assembly comprises an intermediate ring () having an inner annular portion and an outer annular portion provided with means for attaching the turbine blade. The intermediate ring is rotatably mounted to the hub via a first bearing arrangement. According to the invention, the first bearing arrangement comprises a radial bearing () and a thrust bearing, whereby the inner annular portion is mounted to the hub via the radial bearing and the outer annular portion is mounted to the hub via the thrust bearing. The thrust bearing is a plain bearing comprising first and second sliding surfaces () which are clamped to the hub between first and second clamping members ().

Rotational support of a wind turbine blade

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Utrecht, Netherlands

Jascha Van Pommeren