# Question: How do you calculate the horsepower of an AC motor?

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## How do you calculate the power of an AC motor?

For a DC source the calculation is simply the voltage times the current: W = V x A. However, determining the power in watts for an AC source must include the power factor (PF), so W = V x A x PF for AC systems.

## What is the formula of AC motor?

Electric Motor Formula

TO FIND DIRECT CURRENT THREE PHASE
CURRENT P V x EFF P 1.732 x V x EFF x PF
EFFICIENCY 746 x HP V x I 746 x HP 1.732 x V x I x PF
POWER FACTOR —— Input Watts 1.732 x V x I
SHAFT SPEED —— 120 x F no. of poles

## How do you calculate hp motor without nameplate?

If there is no name plate, you won’t be able to know the rated voltage too. In that case, you may have to guess the approx. HP depending upon the size of the motor, select appropriate auto transformer and then run at no load by slowly increasing the voltage till it reaches steady state.

## What horsepower is 5252?

Mathematically, horsepower equals torque multiplied by rpm. H = T x rpm/5252, where H is horsepower, T is pound-feet, rpm is how fast the engine is spinning, and 5252 is a constant that makes the units jibe. So, to make more power an engine needs to generate more torque, operate at higher rpm, or both.

## What is slip formula?

Slip speed is the speed difference between the Synchronous speed and Rotor speed. Slip speed = Synchronous speed – Rotor speed = Ns -N. Slip, s = (Ns – N) / Ns.

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## How do I calculate power?

Power is equal to work divided by time. In this example, P = 9000 J /60 s = 150 W . You can also use our power calculator to find work – simply insert the values of power and time.