b'Converting Motor Pressure To Shaft TorsionWhen differential pressure is measured across the Equation3belowisusedtoconvertpressuremotorports,it canthenbeconvertedtomotor differential into motor shaft output torque.output torsion.Thiscanbeaccomplishedby Equation 3:Motor Output TorqueusingTorqueMotorOutputCurvesforthe T = K x Pspecificmotorbeingused,oronecanuse themotor specific Torque Motor Conversion Factor, Where,(K). Bothareavailablefrommotor T = Hydraulic Motor Output Torque - ft-lbmanufacturers. K = Torque Motor Conversion Factor(Table 16)TorqueMotorConversionFactor K: P = p inp out= Motor Pressure DifferentialEachmotorhasaunique TorqueMotor WhendeterminingtheinstallationtorqueConversionFactor,(K)whichisthe fromhydraulicpressuredifferentials, itisrelationshipbetweenthedifferentialpressure imperative that the motor outlet pressure bemeasured across the hydraulic ports of the motor subtractedfromthemotorinletpressureand the shaft output torque of the motor.This BEFORE referringtoanytablesorchartsfactor, which is referred to as K, may be used thatconvertdifferentialmotorpressuretotocalculatetheoutputtorqueofamotor.In output shaft torque.Table 2 on the following page we have provided Table 2presentsthe TorqueMotorConversionhydraulicgearmotormanufacturersdatafor Factor, (K) for some commonly used hydraulicseveral commonly used hydraulic torque motors. torquemotors,whichwillassistindeterminingThe important column in this table is the Torque themotoroutputtorquewhenpressureMotor Conversion Factor (K). differential is known.Important: Do not confuse the Torque Motor Important:DeterminingoutputshafttorsionConversionFactor,K,withthe Soil when operating at very low motor output torqueEfficiency Factor, k, which is the measure of shouldbeapproachedwithcaution.Hydraulicthe soil friction on the shaft. torquemotorcurvesarenotexactlylinear.Errors are possible at the low end of the motoroutputcurvewhenusingafixed value of K.Caution:It is veryimportant to capture thedifferential pressuredirectly across thehydraulic motor ports.If the pressure measurementconnectionsaremadeatotherlocations,thedifferential pressure readingmay be inaccurate and couldresult in incorrect estimatesof motor shaft torsions.Finally, the accuracy ofthe data is only asaccurate as the gauges.Calibrate the pressuregauges regularly toinsure accurate results.ECP Technical Design Manual - Installation & Testing2021 Earth Contact Products, L.L.C.2021-09 Chapter 4 - Page 64 All rights reserved'