# Simplified Calculation

## Simplified Calculation method of a Hercules Drive System

Note: This is a simplified way of calculation a Hercules Drive System and is intended to give a rough estimation of the general size of a drive system.
Always contact Integrated Drives for a certified calculation.

General
 Input Power Output Power

Start to define max needed output torque and max needed output speed

Max output Power in kW

T = Torque in Nm
n = Speed in rpm
9550 = To get result in kW
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Continue with average needed output torque and average needed output speed

Average output Power in kW

T = Torque in Nm
n = Average Motor speed in rpm
9550 = To get result in kW
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Hercules Motor and Power unit:
The Hercules motor concept is designed for an L10- life of 40 000 hours corresponding to 5 years of continuous 24 hours per day operation. A normal demand from process industries like Chemical, Pulp & Paper, Mineral Processing etc. Here we assume 40 000 hours at average torque and speed. We also assume that the working pressure for the motor is 200 bar at average torque.

Motor size in cc/rev

= Displacement of the motor in cc/rev
T = Average torque in Nm
200 = 200 bar in working mode
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Average Input Power in kW

T = Average torque in Nm
n = Average speed in rpm
9550 = To get result in kW
0.8 = Estimated overall efficiency of 80%
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Pump flow needed at average speed in litre/min

Q = Litre/min
= Displacement of the motor in cc/rev
n = Average speed in rpm
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Max torque and speed:
Usually the max torque is expected when starting. High starting friction, starting with full load, starting at low temperature etc. Often called "Brake away conditions".
In the case of a Hercules Drive system, the prime mover always starts unloaded and double the output torque from the motor do not overload the prime mover. Consequently the prime mover do not need to be oversized because of starting conditions.
In the case max speed and max torque occur at the same time, please contact Integrated Drives for assistance.

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