... rand variable speed compressor ingeresoll rand compressor Ingersoll rand variable speed air compressor37-75kW / 50-100hp VSDMatching a standard variable speed inverter ... offers superb reliability. There are no motor bearings, gears, pulleys, belts, couplings or motor shaft seals to ... no bearings and directly drives the compressor, eliminating gears, pulleys, belts, couplings and motor shaft seals. ...