Tower Technology

Polaris manufactures its own turbine towers. Our vast experience in developing high strength machined parts for extreme load conditions allows us to craft this crucial component of a turbine.

1. All Towers are Mono Pole tubular steel – flanged / sectional
2. Complete wiring harness from nacelle to electrical control panel that is located at the bottom of the tower included
3. Towers are Zinc primed and finished painted with White Urethane Paint for 20 year endurance
4. Turbine mounting hardware is supplied with all towers supplied with Polaris supplied turbines.
5. Tilt up towers are optional on some of the sizes offered by Polaris
6. Foundation mounting with foundation anchor cage is also optional from Polaris.

Tower Raising Video

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Tower Image Gallery

Permanent Magnet Turbines

We deliver technology to make wind power generation more efficient. The new Polaris wind turbines will incorporate ,Permanent Magnet (PM) technology which achieves more efficient wind power generation and is able to produce more power at lower wind speeds due to its coreless technology. The ability of Polaris generators to eliminate traditional cogging issues makes it the ideal candidate for wind turbine applications. This new technology eliminates the need for a gearbox to be used as part of the wind turbine drive train thereby minimizing down time and reducing maintenance costs over the life of the system.

In PM generators, a coil is wrapped around a specially designed disc at the centre axis. Magnetic discs then rotate on the sides of the coiled disc and generate electricity. This kind of power generating technology is therefore ideal for wind power generation because its initial operation torque (cut-in speed) is lower.

Generator Advantages

• Neodymium, Iron, Boron (Nd-Fe-B) sintered permanent magnets specifically selected according to the application requirements
• High Specific Power
• High Efficiency
• Low Start Up Torque
• Minimum Torque Ripple
• Virtually Maintenance free
• Built to IEC 60034-1 Standards

Cogging- Agricultural Wind Generators

The cogging torque of the permanent magnet (PM) wind generators is generated from the interaction of permanent magnet MMF harmonics and air-gap harmonics due to slotted structure of stator core. It manifests itself by the tendency of a rotor to align in a number of stable positions even when the machine is unexcited, and results in a pulsating torque, which does not contribute to net effective torque. These torque ripples result in undesirable mechanical vibration and noise. For this reason, the cogging torque should be kept small in the design process for the purpose of constant speed operation and high precision position control.

In direct-driven wind generators supplied in Polaris turbines, the rotor rpm is low, thereby requiring large number of poles to operate these turbines. Generally, rotational speed of a direct-driven electric generator for a wind turbine is lower than conventional electric machines. Due to large number of poles in Polaris PM direct-driven wind generators, the width of the magnet pole is very short. Thus the rotor has almost uniform air gap. With the magnetic pole very short or nonexistent – cogging is virtually eliminated.

Air Cooling System

Heat Build Up

When the generator is operating and producing electricity, it produces heat. As the heat increases, generator efficiencies decrease. To solve this problem, our generators include a air cooling system. This drastically reduces the associated wear that high-temperatures can cause, and thus improves the life-span of our generators.

Power electronics

After an intense engineering and industry requirements review, Polaris gone with variable frequency drives to control the generator and invert power. Designed for 3 phase applications.

• Each VFD includes a generator side inverter and a grid side converter (Active Front End/Power Supply).
• Generator begins generating power to the network as soon as the generator begins to spin. Generation begins at a much lower blade speed than equivalent inverter technology.
• Full Regenerative Drive with safe shut down for over wind conditions.
• The VFD has 95.5% efficiency at full power.
• Low current THD (Total Harmonic Distortion) typically 5% or less at full power.
• All VFD full Regenerative drives and Power Supply (AFE) provides a .99 power factor.
• CANbus and Ethernet communications are available for Control and Communications to Polaris Network.
• A power converter will be added to all single phase applications which will allow three phase power to be converted back to single phase power for grid tie in.

Mounting

 All power electronics are mounted, pre-wire, programmed and tested in NEMA rated 3R enclosures for indoor/outdoor placement.