18 HE PUMPS AND DC MOTORS He2000 24MD22S-WALX2 He2200 24MD22S-HEX2 He2000 MD pump motor 24VDC Ø 112 mm n U P S2 S3 Eff 0 100 200 300 400 n [rpm] 0 2000 4000 6000 8000 U [V] 0 10 20 30 40 P [W] 0 1000 2000 3000 4000 Eff 0.0 .2 .4 .6 .8 S2[min] 0 10 20 30 40 S3[%] 0 10 20 30 40 I [A] I P = power n = speed Eff = efficiency S2 = continuous (min.) I = current S3 = intermittent (%) U = voltage He2000 24MD22-WALX He2200 24MD22-HEX He2000 MD pump motor 24VDC Ø 112 mm M [Nm] Torque 0 1 2 3 4 5 6 7 8 9 10 11 12 0 100 200 300 400 n [rpm] 0 2000 4000 6000 8000 U [V] 0 10 20 30 40 P [W] 0 1000 2000 3000 4000 Eff 0.0 .2 .4 .6 .8 S3[%] 0 20 40 60 80 S2[min] 0 20 40 60 80 I [A] n U Eff I P S3 S2 P = power n = speed Eff = efficiency S2 = continuous (min.) I = current S3 = intermittent (%) U = voltage Code Motor 33 24MD22S-WALX2 28 24MD22S-HEX2 Curve below shows motor performance only. To size a motor correctly, calculate “hydraulic power”: P(kW) = p(Bar) x Q(L/min) ÷ 600). Look in the diagram and find the torqueM(Nm) and rpm for the calculated power. Then calculate“pump displacement”D(cm3/rpm) for your neededworking pressure p(Bar): D(cm3/rpm) = (M(Nm) x 2π x 10 x 0, 9) ÷ p(bar). From the result, choose the closest, smaller, displacement of the standard pumps. Then check the flow Q(L(min) for the chosen pump Q(L/min)=((n/rpm) x D(cm3/rpm)) ÷ 900. From that reference, check the curves below for motor speed, current draw, S2 and S3 performance. S2 is the number of minutes a unit can operate at a certain workload before reaching the maximum allowable temperature. The unit must cool down until the motor temperature is less than 2°C from the ambient temperature before the same S2 value can be applied again. S3 is the maximum time in % per 10 minute period that a unit can work at a certain pressure/workload. For example, an S3 value of 30% = 3 min. for each 10 min. period, over and over again. Curve below shows motor performance only. Code Motor 34 24MD22-WALX 30 24MD22-HEX quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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