Adjustable speed belt gear motors are space-saving, constantly adjustable drives. In the standard version the central adjustment is manufactured with a hand wheel. Unlike inverter procedure the motor power remains continuous and the torque improves 
if the swiftness of the motor drops.
The variable speed gear unit housing has a confirmed symmetrical design. The adjusting pulleys have got a wedge designed symmetrical cross section with low mass. The shape of the pulleys Variable Speed Belt Gear Motors Speed Reducer Gearbox ensures uniform flank pressure and therefore high power transmission, also at high belt quickness.
The result is optimal control behaviour with uniform distribution of forces and minimal energy consumption.