Power Calculation

Power calculation for Motorised Pulleys in bulk handling
In Order to calculate the necessary power required the following formula may be used:
Power calculation for Motorised Pulleys
P = Necessary power [kW]
C = Frictional resistance in belts, bearings etc. (Fig.I)
f = Friction in conveyor pulleys is fixed to 0.025 - 0.030.
L = Centre- to centre distance between drum motor and idler pulley [m] 		Gm = Weight of belt and rotating parts in conveyor pulleys as well as idler pulley (Fig.II) [kg/m]
v = Velocity [m/sec.]
Qt = Capacity of the belt [t/h]
H = Lift [m]
B = Belt width [mm]

The power calculation does not include the extra power required for belt scrapers, ploughs, cleaners or receiving hoppers.
Fig I Factor C
L [m]
C 		3
9.0 		4
7.6 		5
6.6 		6
5.9 		8
5.1 		9
4.5 		10
4.1
L [m]
C 		16
3.6 		20
3.2 		25
2.9 		32
2.6 		40
2.4 		50
2.2 		63
2.0
L [m]
C 		80
1.9 		100
1.8 		125
1.65 		160
1.59 		200
1.47 		250
1.38 		300
1.33
L [m]
C 		400
1.25 		500
1.20 		600
1.17 		700
1.13 		800
1.11 		900
1.08 		1000
1.05

Fig II Gm [kg/m]
B
[mm] 		500 600 650 800 1000 1200 1400 1600 1800
Gm for standard conveyors 17 26 28 40 56 70 85 105 120
Gm for heavy and profiled belts 20 30 32 45 62.5 80 110 135 160

After choice of drum motor power, the required belt pull and power consumption may be calculated as shown below:
Required Torque
Required Torque
M = torque [Nm]
D = diameter [m]
v = speed [m/sec]
P = power [kW]

Required Belt Pull
Required Belt Pull
F = belt pull [N]
v = speed [m/sec]
P = power [kW] 		Power Consumption
(accurate to ± 20%)
Power Consumption
I = power consumption [A]
P = power [kW]
U = Voltage [V]
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