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Output torque:<br />
the output torque must never exceed Tmax. In the event that brakess are mounted on the gearbox or the motor,<br />
one must ensure that the braking torque does not exceed the maximum torque of the gearbox, itself multiplied<br />
by 1,1; with regards to the real braking torque, it is also necessary to consider the Effi ciency of the gearbox; see<br />
part 8.<br />
Input velocity:<br />
must not exceed the maximum gearbox input speed.<br />
Thermal power:<br />
in the event that the installed power is greater than the thermal power of the gearbox, it is necessary to provide a<br />
cooling circuit or to select a larger gearbox. The power to dissipate is:<br />
where P2 is the power transmitted by the gearbox. In the event that thermal power is not exceeded, but the<br />
application is particularly onerous, it may be necessary to install an oil circulation and fi ltering system.<br />
3. Motor selection method<br />
3.1 Hydraulic drives<br />
Knowing the hydraulic circuit pressure, from which the Dp of the motor can be obtained, the torque T1, the velocity<br />
n1 required at the input of the gearbox, the hydraulic motor capacity must be greater or equal to:<br />
where ηm is the mechanical effi ciency of the motor. The necessary supply fl ow rate is:<br />
where ηv is the volumetric effi ciency of the motor. Please use the following table as a guide for hydraulic motor<br />
selections.<br />
Hydraulic motors<br />
Use light medium heavy<br />
Pressure [bar]