Variable speed belt 
gear motors are space-saving, continually adjustable drives. In the typical edition the central adjustment is made with a hand wheel. Unlike inverter procedure the electric motor power remains constant and the torque raises if the quickness of the motor drops.
The variable speed gear unit housing includes a confirmed symmetrical design. The adjusting pulleys have a wedge formed symmetrical cross section with low mass. The shape of the pulleys ensures uniform flank pressure and therefore high power transmission, even at high belt rate.
The effect is optimal control Variable Speed Belt Gear Motors Speed Reducer Gearbox behaviour with uniform distribution of forces and minimal energy consumption.