Global Wind Turbine Towers Market Keep Growing


New research shows wind power continues to be the global renewable energy source of choice, with the wind turbine towers market expected to increase from $12.1 billion in 2013 to $19.3 billion by 2020, an annual growth rate of 6.9 percent.

According to a new report from research and consulting firm GlobalData, worldwide wind power cumulative capacity is expected to more than double over the next six years from 322.5 Gigawatts (GW) in 2013 to 688 GW in 2020 as nations confront rising fossil fuel prices and increasing environmental concerns.

China installed the most wind turbine towers in 2013, dominating the global market share with 47.4 percent. The USA came in second with 7.5 percent, followed by India and Canada shares of 6.5 percent and 5.8 percent, respectively.

A report from GlobalData showed that in 2012, China and the US installed 23,261 and 20,182 wind turbine rotor blades respectively and together contributed to more than 65% of global installations.

China is forecast to remain the world’s leading consumer of wind turbine technology, and now produces approximately 25 percent of the wind turbine rotor blades.

Slip ring as an important rotary joint that provide power and signals transfer from the nacelle to the control system for the rotary blades, its demand keep growing along with wind turbine towers’ growing. But because of wind turbines have near ultimate high quality requirements to slip rings, only a few wind turbine slip ring suppliers have the capability to can meet their need. MOOG from USA and Stemmann and Schleifring from Germany they occupied the largest share in the wind energy slip ring market.

Most wind turbine slip rings have the similar requirements, but they all required 20 years lifetime and maintenance-free. Most electrical slip ring suppliers aren’t able to provide so long lifetime slip rings. AOOD has been through a long time R&D and now are capable to offer large wind turbine slip rings to replace MOOG, Stemmann and Schleifring units since five years ago with lower price. AOOD wind turbine slip rings can provide 20 years lifetime and 5 years warranty.

In production, all rings of wind turbine slip rings have been processed special smoothness treatment and up to Ra0.1 mirror grade, ensure the smooth contact with brushes. And all rings have been hard gold-plated processed, maximum guarantee the minimum contact resistance and high wear resistance. The accuracy of overall machined aluminium alloy shaft up to 0.02mm. Unique U-groove design to ensure stable multi-points contact, significantly reduce electric noise and contact resistance, as three contact surfaces adapt multi-points contact, it is better to meet high current and accurate signals transfer requirements. The ABS insulation layer 3mm above torus increases maximum interphase climbing arc distance while effectively preventing brushes skip to adjacent rings. Adopt the most advanced precious metal fiber brushes technology and multi-point contact design to achieve stronger current load capacity. Each signal ring has more than 12 contact points to ensure reliable transmission under long time working situation. Outstanding sealing, especially strengthen sealing of the rotating side wires outlet and dynamic sealing of rotating connection. Cable seals used in the rotor wires outlet of slip ring can effectively preventing oil flow into junction box. Better sealing and anti-ageing by using fluorine rubber sealing ring at the main bearing. The slip ring surface all have been adopted industrial-grade anticorrosive plant, effectively preventing salt spray corrosion.

AOOD controls production process strictly and make all AOOD slip ring assemblies feature extremely low electrical noise and contact resistance, accurate and steady signal transfer, low contact pressure and low wear between brushes and rings, excellent electrical performance, support high/low frequency signal, INTERCAT, high speed digital signal, and support mixed signal and power transmission without interference, operating temperature range from – 40 ℃ to + 80 ℃, overall style aluminium alloy structure adapt to vibration, moisture, acid and alkali corrosion, lightweight and other complex environments to achieve 20 years lifetime and maintenance cycle up 5 years one time. HARTING connectors of both sides are available to make slip ring easily connect to wind generator to facilitate installation.

Model Selection

A slip ring is an electromechanical device which in combination with brushes that allows the transmission of power and electrical signals from a stationary to a rotating structure.

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