Motor Efficiency Calculator

Formula

The formula to calculate the motor efficiency (n) is:

\[ \text{n} = \left( \frac{0.7457 \times \text{HP} \times \text{L}}{\text{iP}} \right) \times 100 \]

Where:

\(\text{n}\) is the efficiency (%)
\(\text{HP}\) is the motor horsepower (hp)
\(\text{L}\) is the load (percentage of rated power, e.g., 0.50 for 50%)
\(\text{iP}\) is the input power (kW)

What is Motor Efficiency?

Motor efficiency is the ratio or percentage of input power that a motor, typically an electric one, can convert into useful output work or power. It is a crucial metric for determining the performance and energy efficiency of a motor.

Example Calculation

Let's assume the following values:

Motor Horsepower (HP) = 10 hp
Load (L) = 0.75 (75%)
Input Power (iP) = 8 kW

Using the formula to calculate the motor efficiency (n):

\[ \text{n} = \left( \frac{0.7457 \times 10 \times 0.75}{8} \right) \times 100 \approx 69.9\% \]

The motor efficiency (n) is approximately 69.9%.