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Machine Design

Low-harmonic drives - Danfoss Drives

The VLT low-harmonic drives ensure high-quality sine waves from the power-supply grid by actively imposing currents, as needed.
The drives come in 132 to 630-kW high overload, 160 to 710-kW normal overload, and voltage range of 380 to 480 Vac, 50 to 60 Hz. The units are suitable for generator-powered installations, or those with generator back-up power; soft power grids, and grids with limited excess power capacity.

The VLT drives produce no motor winding stress; no impact on bearing life; and provide users with full readout of unit performance towards the grid, including a graphical overview of grid behavior. The drives continuously regulate the network and load conditions without affecting the connected motor.

Danfoss Drives, 4401 N. Bell School Rd., Loves Park, IL 61111, (800) 432-6367,

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