The distinctive feature of mechanical variators lies in their ability to operate up to the limit of permitted torque while avoiding slippage of the drive mechanism that would otherwise dramatically reduce variator life. When selecting Bonfiglioli variators (known as the ‘V’ series), there are numerous things to keep in mind:
- Since the drive mechanism transmits variable power and is applied constant power at the input end, obviously transmitted power will always be lower than installed power in the low RPM range.
- The amount of stress applied to the variator can only be measured with the motovariator delivering maximum output speed by measuring the current drawn by the motor.
- If measured consumption is higher than the rated consumption reported on the motor plate, it is safe to conclude that the motovariator does not meet application requirements. This verification can only be performed when the variator is running at peak RPM and the motor is running with full power.
When the current drawn is equal to or lower than the motor rated value, the motovariator size has been selected properly.
In addition to all of the above, note that the maximum number of starts allowed to preserve variator life is 8-10 starts per minute.
The Bonfiglioli V series ranges from V0.25 (4Nm) through to the V10 (144Nm). This range gives complete flexibility in mechanical speed control.