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**Number of poles (AC induction motor) calculator** - step by step calculation, formula & solved example problem to find the number of poles required to attain a certain synchronous speed. Line frequency & synchronous speed are the key elements in this calculation.

The below mathematical formula is used in this calculator to determine the number of poles required to attain a certain synchronous speed of an induction motor

The below step by step solved example problem may helpful for users to understand how the input values are being used in number of poles calculations.

**Example Problem**

Find the number of poles to design an induction motor to attain the synchronous speed N_{s} = 1500 rpm, whose line frequency f = 100 Hz?

**Solution**

The given data

f = 100 Hz

N_{s} = 1500 rpm

__Step by step calculation__

Formula to find p = 120f/N_{s}

substitute the values in the above formula

= (120 x 100)/1500

**p = 8**

In the field of *electrical engineering* while designing an induction motor for certain synchronous speed, finding the number of poles is important. The above formula, step by step calculation & solved example problem may be useful for users to understand how the values are being used in the formula to find the number of poles, however, when it comes to online for quick calculations, this calculator helps the user to perform & verify such calculations as quick as possible.