The correct choice of engine power is the key to reliable operation. Underestimated power leads to overload and overheating, overestimated power leads to unnecessary costs and low cos φ. Let's look at how to calculate engine power.
What to start from
Engine power is selected according to the required power of the mechanism, taking into account the reserve. Typical mechanisms have their own formulas:
- Pumps—by performance, pressure and pump efficiency.
- Fans—by air flow and pressure.
- Conveyors—by load weight, speed and resistance.
Power reserve
A reserve is added to the design power (usually 10–25%) so that the engine does not work at the limit. But an excessive reserve is harmful: an underloaded engine has low efficiency and cos φ.
| Situation | Consequence |
|---|---|
| Power is underestimated | Overheating, overload, combustion |
| Power optimal | Reliable economical operation |
| Power is too high | Low efficiency, extra costs |
Practical approach
When replacing, it is easiest to focus on the power of the failed engine, if it copes with the task. But if the old engine constantly overheated, it is worth reconsidering the choice. When selecting a replacement engine the speed and installation design are also taken into account.
Don’t know what power to choose, or is the engine constantly overloaded in Tashkent? Elektromotors engineers will help with the selection - contact us.