Mechanicalanical Engineering Design Engineer
Conveyer motor power calculation
This is vidyaprakash from analysis seeking motor power calculation.
Belt conveyer system variable load up to 600kg,rotational speed of 2rpm
To drive Conveyer belt arrangement motor with gearbox due to space constraints such that chain sprockets(ratio 1:1) being attached and has to drive from some distance.
we have to calculate required power to drive the system.
I have proceeded this as mass which has to rotate radius from this found Torque,And frictional resistance from belt on conveyer pulley found frictional torque,And to overcome inertial torque on the system
can any body comment my calculation?Any parameters missed?
What is the running torque after acclerate in to required speed?
What is the Service factor to be taken up?
Power calculations are typically considered the product of equivalent tension multiplied by belt speed.
For belt conveyors, this may be equivalent tension (Te) (sum of friction, material acceleration and lift forces, in N) multiplied by conveyor belt speed (in m/s).
Frication force is nominally the product of an artificial friction factor (unit less, maybe 0.02) and mass of the conveyor system (material, belt and idlers).
Mat acceleration = mass flow rate (kg/s) x change in velocity (m/s) (typically belt velocity) (or F= mdotxDv from first year engineering physics)
Lift force = mass / m of material, multiplied by elevation
Other forces may include scrapers, pulleys etc
The basis of rigid body calculations assumes the running / starting torque of the conveyor belt is constant (note none of the above terms are dependant on the rate of acceleration, hence this assumption sounds reasonable).
The acceleration rate associated with starting may be calculated, through considering
F = available starting force (maybe starting factor x installed power)/ belt speed
m= mass of system (pulley, belt, idler, material)
a = As calculated
From the above (after selecting an installed power based on running power, calculated earlier) a rate of acceleration, and hence associated tensions can be calculated.
The Te that the conveyor system sees during starting is proportional to the difference of Te available (installed power x SF / belt speed) and that required to rune the conveyor, and the proportion of equivalent mass of the drive and the conveyor, having said this, as I said earlier, the rigid body calculation assumes the running torque remains constant (the Te is a sum of the force required to run the conveyor, as calculated, and the proportional force required to accelerate it).
Safety factors vary, have seen 10 % to 20 % of calculated, depends on application and client specifications.
7th December 2009, 16:48
It is needed to drive the conveyor with some kind of belt drive system. the speed of the conveyor band shall be 0,1m/s. The conveyor length is 7m and the roller diameter of the driven shaft is 200 mm..Diameter of the drive shaft is 30mm. The drive shaft of the conveyor is placed 0,8m above the floor. The nominal power consumption for the empty conveyor is 1500W.
We need to design a motor for this, should we calculate the torque needed using diameter of the driven shaft or drive shaft? and what other things we need to consider?
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