Page 5 - Parker - Vane motor high performance hydraulic series M5B-M5BS-M5BF

MOTOR SELECTION - M5B* SERIES

Motor performances required 1. Check if available power is greater than required power (0.85 estimated overall
Torque T [in.lbf] 970 efficiency).
Speed n [RPM] 1500 0.85 x q Ve x p ≥ T x n 0.85 x 14.5 x 4060 ≥ 970 x 1500
Pump available data 1714 63 000 1714 63 000
Flow qVe [GPM] 14.5 29.2 > 23.1 HP
Pressure p [PSI] 4060 Two ways of calculation : Calculate Vi from T required torque, or from qVe available flow

2 π x T 231 x q Ve
2a. V i = = 2b. V i = =
p n
2 π x 970 231 x 14.5 = 2.23 in ⁄ rev.
3
3
= 1.50 in ⁄ rev.
4060 1500
3a. Choose motor from Vi immediately 3b. Choose motor from Vi immediately
greater smaller
3
3
M5B* 028 : Vi = 1.71 in /rev. M5B* 036 : Vi = 2.20 in /rev.
4a. Check theoretical motor pressure 4b. Check theoretical motor press. with
T = 970 in.lbf
2 π x T 2 π x 970 2 π x T 2 π x 970
p = = = 3560 PSI p = = = 2770 PSI
V i 1.71 V i 2.20
Torque loss at this pressure = 85 in.lbf Torque loss at this pressure = 70 in.lbf
(See page 6) (See page 6)
Calculate real pressure Calculate real pressure
2 π x (T + Tl) 2 π x (T + Tl)
p = = p = =
V i V i
2 π x 1055 2 π x 1040
= 3880 PSI = 2970 PSI
1.71 2.20
5a. Flow loss at this pressure : 1.3 GPM 5b. Flow loss at this pressure : 1.1 GPM
(See page 6) (See page 6)
Real flow used by the motor : Real flow used by the motor :
14.5 - 1.3 = 13.2 GPM 14.5 - 1.1 = 13.4 GPM

6a. Real speed of the motor : 6b. Real speed of the motor :
qV x 231 13.2 x 231 qV x 231 13.4 x 231
n = = = 1780 RPM n = = = 1410 RPM
V i 1.71 V i 2.20
Real performances Real performances
3
3
Vi = 1.71 in /rev. Vi =2.20 in /rev.
n = 1780 RPM n = 1410 RPM
T = 970 in.lbf T = 970 in.lbf
p = 3880 PSI p = 2970 PSI
In each case always choose the smallest motor which will operate at the highest speed and
pressure, and will offer the most efficient solution.
FLUID POWER FORMULAS
1
Volumetric efficiency total leakage x 231 Speed [RPM]
3
1 + Displacement [in /rev]
speed x displacement
∆ pressure [PSI]
Mechanical efficiency 1 − torque loss x 2 π Flow rate [GPM]
∆ pressure x displacement Leakage [GPM]
Torque [in.lbf]
231 x flow rate
Fluid motor speed RPM x volumetric eff. Torque loss [in.lbf]
displacement
Fluid motor torque in.lbf ∆ pressure x displacement
x mech. eff.
2 π
Fluid motor power HP speed x displacement x ∆ pressure x overall eff.
395934
torque x speed
HP
63 000

5 Back To The Table Of Content Parker Hannifin
Denison Vane Pump Division
Vierzon - France