# How to find RPM and Pole Pairs in Induction Motors?

**URL:** <https://forumautomation.com/t/how-to-find-rpm-and-pole-pairs-in-induction-motors/12441>\
**Category:** Electrical\
**Tags:** calculator, motor-control\
**Created:** [August 14, 2024, 10:05am UTC](https://forumautomation.com/t/how-to-find-rpm-and-pole-pairs-in-induction-motors/12441 "2024-08-14T10:05:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [August 14, 2024, 10:05am UTC](https://forumautomation.com/t/how-to-find-rpm-and-pole-pairs-in-induction-motors/12441/1 "2024-08-14T10:05:37Z")

</div>

**[Calculation](https://forumelectrical.com/electrical-calculator/)**

 ![image](https://cdn.forumautomation.com/original/2X/1/1e15805b76776e27c3abe439f0ec95d4d7276623.jpeg)

## [color=#ff7700] Parameter [/color]

## [color=#1e00a3] RPM (Revolutions per Minute) [/color]

**[RPM](https://forumelectrical.com/what-is-induction-motor-and-how-its-works/)** is calculated by the formula:

**RPM = (120 × Frequency) / Number of Poles**

The frequency refers to the supply frequency (e.g., 50 Hz), while the number of poles depends on the motor’s design.

## [color=#ff7700] Parameter [/color]

## [color=#1e00a3] Number of Pole Pairs [/color]

One can determine the number of pole pairs (P) by dividing the total number of poles (N) by 2:

**P = N / 2**

**Ex:** A 4-pole motor has 2 pole pairs.