Parvalux reports that it has further expanded its extensive range of gearboxes with the addition of a range of planetary gearboxes and combined motors. Planetary gearboxes are smaller, lighter and more efficient than other gearbox types, asserts the company, offering a high speed reduction capability with very compact dimensions. The high torque motor and gearbox combinations are available in a range of diameters that include 28mm, 36mm, 45mm, 56mm, 72mm and 82mm, with up to four stages having reduction ratios from 3.7:1 up to 720:1. The gearboxes have excellent backlash characteristics, are quiet running and have high efficiencies. They offer a high torque-to-size ratio, producing in excess of 120Nm in the larger 81mm diameter at input speeds of up to 4000rpm. Options include various lengths of motors in each diameter with shaft options to suit customers' individual requirements. The permanent magnet DC motors are available in 12V or 240V supplies, with other voltages available on request. The new range is suited to a wide range of applications that require high performance in compact sizes.