A complete range of reversible units and hydraulic gear motors compliment the range of hydraulic motors and pumps for all types of industrial process, heavy plant, agricultural and commercial equipment.
These are some of the criteria to consider when deciding which size gear motor is needed for an application.
Fluid velocity:
Calculate the velocity (v) of a fluid in a pipe as follows:
v = Q
÷ (6 • A [m/s])
Q = flow rate [litre/min]
A = inside area of pipe [cm²]
Absorbed flow rate:
Calculate flow rate (Q) as follows:
Q = (V • n • 10 -3)
÷ hvol [litre/min]
V = displacement [cm³/rotation].
n = rotation speed [rotations per minute].
hvol = motor volumetric efficiency (take 0.95 as an indicative value for rotation speeds ranging between 1000 and 2000 rotations per minute).
Delivered torque:
Calculate necessary torque (M) of a motor subject to pressure differential between input and output as follows:
M = (V •
Dp •
hhm)
÷ 62,8 [Nm]
V = displacement [cm³/rotation].
Dp = pressure differential [bar].
hhm = hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions).
Delivered power:
Calculate hydraulic power (P), delivered by a motor subject to a pressure differential between input and output as follows:
P = (Q •
Dp •
htot)
÷ 600 [kW]
Q = flow rate [litre/min.].
Dp = pressure differential [bar].
htot = total motor efficiency (
hhm • hvol).
Values for
hvol and
hhm (and consequently
htot) depend on pressure differential between supply and delivery, rotation speed, fluid features (temperature and viscosity) and filtering degree.Contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 for further details on efficiency. The proper values for flow rate, torque and supplied according to pressure differential, rotation speed and set test conditions, can be found via this link for the
Performance Curve pages.