Gear Motors ALM Series Installation and Running Information 11 www.jbj.co.uk/gear-motors.html #DriveLineHarmony Frequently Used Formulas v =Q / 6 •A[m/s] In case of axial and/or radial loads on themotor’s shaft T option is available for some GHM2models and RAoption is available for some GHM1 types. The link between the motor and the driven device must be via a mechanical power transmission coupling that will not transfer radial and/or axial thrust to the shaft of the motor otherwise wear of the internal components will quickly occur. jbj Techniques have a wide range of suitable couplings to suit a wide range of applications and we can advise on which coupling depending on the circumstances of the application. Drive For further details contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 Fluid velocity Calculate the velocity (v) of a fluid in a pipe as follows: 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 = pump 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 amotor 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] The proper values for flow rate, torque and supplied according to pressure differential, rotation speed and set test conditions, can be found on the Performance Curvepages. htot = total pump efficiency (hhm •hvol) P= (Q •Dp •htot) / 600 [kW] Q= flow rate [litre/min.] hhm= hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions). Values for hvol andhhm (and consequentlyhtot) depend on pressure differential between supply and delivery, rotation speed, fluid features (temperature and viscosity) and filtering degree. Delivered power Contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 for further details on efficiency. Dp = pressure differential [bar] Calculate hydraulic power (P), delivered by amotor subject to a pressure differential between input and output as follows:
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