Low-Noise Motors for Wind Turbines

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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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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Low-noise wind turbine blade design that improves aerodynamic efficiency while reducing noise. The blade has an adjustable flap at the trailing edge made of acoustic metamaterial. The flap angle can be changed to increase lift at low wind speeds. The flap is also made of materials that absorb noise. By optimizing blade shape and adding noise-reducing flaps, the blade efficiency is increased while noise is reduced compared to traditional blades.

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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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Low-noise wind turbine blade with adjustable flaps at the trailing edge that can be moved to change the blade shape and improve lift and efficiency at low wind speeds. The flaps have sound-absorbing acoustic metamaterials to reduce noise radiation compared to fixed blades. The flaps can be moved using a drive mechanism to adjust the blade angle of attack. This allows optimizing blade shape for low wind starts and reducing noise pollution.

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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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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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A multi-phase motor for wind power generation systems that reduces noise compared to conventional diode rectifier systems. The motor has a multi-phase stator with N phases spaced 60/N degrees apart in each phase band. This reduces noise compared to conventional 60 degree phase spacing. The motor also has front and rear bearings, end covers, and a rotor enclosed in a casing.

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A noise-reducing wind turbine blade design that aims to mitigate the high noise levels produced by rotating wind turbine blades. The blade has features like vortex generators, serrated tooth edges, and bent winglets to reduce noise at the blade leading and trailing edges. The vortex generators create turbulence that orders the airflow and reduces impact noise at the leading edge. The serrated teeth gradually taper in thickness from the inside out. The bent winglets transition smoothly between the blade root and leading edge, weakening vortex strength and noise at the trailing edge.

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Synchronous generator for wind turbines and hydroelectric power plants that reduces acoustic emissions. The generator has a unique stator design with decoupling units between the stator core and ring. These decoupling units, filled with a pressure medium, absorb vibrations and noise from the core and prevent transmission to the ring. The decoupling units are inserted into the gap between the core and ring during assembly. The units have flexible mats sandwiched between plates. The pressure medium is introduced into the mats to fill the cavities after insertion.

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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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