Wind Turbine Motor Designs for Improved Noise Reduction

Rotor design for generators to reduce noise during operation. The rotor has features like fan-shaped sheets on the outer wall of the rotor support, chutes sliding on bars to fix positions, air ducts between the sheets, winding cavities, and sound absorbing cotton inside covers. These elements help dissipate heat, guide airflow, reduce turbulence, and absorb noise compared to a conventional rotor design.

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A noise reduction structure for wind turbine generators that mitigates vibrations and noise generated during operation. The structure includes features like shell damping, generator noise reduction, upper shell switching, and transmission shaft stabilization components on the support column. These components help absorb and dissipate vibrations from the generator body, fan blades, and transmission shaft to reduce noise transmitted to the surrounding environment.

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Gas turbine generator unit with noise reduction structures to mitigate vibration-induced noise. The unit has a pedestal with a locking groove, a rotating shaft, a rotor, a stator, and noise reduction components in the locking groove. These components include a soundproof fiber layer, a porous sound absorbing layer, a viscoelastic damping layer, and a damping layer. This configuration reduces noise transmission from the rotating shaft and rotor vibrations through the pedestal to the surrounding environment. The noise reduction components in the locking groove absorb, dissipate, and isolate vibration-induced noise.

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A noise reduction device for wind turbines that can be easily installed inside the nacelle to significantly reduce the noise generated by the generator. The device wraps around part of the generator to absorb and shield noise. It consists of interconnected support frames that fix to the generator inside the nacelle, with spaced damping units between the frames and generator. These cover and surround the generator to reduce noise through interference and absorption.

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Wind turbine generator with noise reduction to meet stricter noise limits for larger turbines. The generator has ducts and silencers to suppress noise from the cooling air flow. An air inlet duct brings air into the generator interior. A pressure chamber distributes heated air to outlet ducts. Silencers in the outlet ducts muffle the airflow turbulence. A shut-off valve opens during operation to allow airflow. This reduces noise by dampening flow turbulence and preventing loud direct duct flow.

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Reducing noise pollution from vertical axis wind turbines in built-up environments by using a sound attenuation arrangement for the turbine. The arrangement involves spaced-apart first stator elements around the turbine rotor space. This creates a sound damping effect by reflecting and scattering sound waves. The stator elements can be fixed in place to prevent vibration transfer. Additional stator elements, roof, and bottom elements can further enclose the rotor space for further sound attenuation.

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A noise reduction system for wind turbine generators that significantly reduces the noise generated by wind turbines. The system uses an innovative design for the generator housing and fan blades to concentrate airflow and reduce noise. The housing has insulation layers, embedded fans, and angled partitions to direct airflow internally and reduce external noise. The fan blades have triangular shapes with grooves to cut airflow and further concentrate it internally. This reduces the external noise from the blades by directing the airflow into the core of the generator. The internal fan then radiates the concentrated airflow to dissipate heat. The design aims to minimize noise from both the fan blades and generator components.

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Noise reduction device for wind turbine generators to mitigate the high noise levels produced during operation. The device uses an optimized blade shape, internal sound insulation, and heat dissipation to reduce noise. The blade tips have triangular structures with grooves that concentrate air flow and reduce noise compared to plain tips. Inside the generator, upper and lower insulation layers surround the components. An embedded fan draws heat. The generator housing has a vertical hole for sound entry. An inclined plate and angled hole direct sound into the stator. This concentrates noise into the stator core instead of radiating externally. The vertical plate with sound entry hole further reduces noise. The optimized blade tips, internal insulation, heat dissipation, and sound entry/directing features all work together to significantly reduce wind turbine generator noise.

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Noise reduction device for blades of wind turbines to mitigate noise levels and improve blade stability. The device consists of a fixed box with a rotating shaft inside supported by a bearing block. The turbine blade is mounted on the shaft. The shaft rotation is stabilized by the bearing block, reducing friction and vibration. The bearing block also supports the shaft to prevent collisions with the box walls. This improves blade stability and reduces noise compared to a bare shaft. The blade can still rotate freely. The device can be retrofitted to existing turbines.

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Environmentally friendly low-noise wind power generator that reduces noise during operation compared to conventional wind turbines. The noise reduction is achieved by modifying the wind wheel design to prevent periodic low-frequency sounds and sealing the generator and gearbox to reduce noise transmission. The wind wheel has a deflector with blades and grooves that prevent periodic airflow patterns. The blades have preformed grooves with limit rods and movable panels that prevent airflow stall. The movable panels have countersunk grooves with buffer pads to absorb impacts. The generator and gearbox are sealed inside the unit housing to prevent noise transmission. This reduces low-frequency noise propagating outward during operation, making the wind turbines quieter and more suitable for closer placement near people.

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Wind turbine generator with sound insulation to prevent mechanical noise generated inside the nacelle from leaking outside. The sound insulation includes a lower plate, upper plate, sound-absorbing pad, nuts, and bolt. The plates form a space between them. The lower plate attaches to the nacelle wall. This creates a sealed enclosure around the gearbox to block noise transmission. The sound-absorbing pad inside the upper plate further reduces noise transmission.

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Flexibly balancing power production and noise reduction in wind turbines by adjusting the rotor speed setpoint based on wind speed. The method involves determining a lower weighted rotor speed setpoint for a given wind speed that reduces noise compared to the rated speed. This weighted setpoint is used to control the rotor during partial load operation. By lowering the rotor speed for some wind speeds, noise is reduced at the cost of slightly lower power production.

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A wind turbine rotor blade with an improved noise reducer design that provides better noise reduction compared to conventional designs. The noise reducer is mounted near the blade trailing edge and has a unique configuration with interconnected noise reduction devices. Each device has an auxiliary device attached to multiple primary devices. This interconnected layout allows the noise reducer to have improved responsiveness to wind flow direction compared to separate devices.

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A wind turbine rotor blade with a removable noise reducer that can be easily replaced and reduces vulnerability to lightning strikes compared to directly attached noise reducers. The removable noise reducer attaches to a separate mounting plate on the blade surface, rather than adhesively bonded directly to the blade. This allows the noise reducer to be swapped out independently and reduces risk of damage during transportation or lightning strikes. The mounting plate connects the noise reducer to the blade and can also house a lightning protection device inside the blade.

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