How To Calculate RPM Of DC And AC Motor, Formula To Calculate RPM

August 15, 2021February 21, 2022 CS Electrical And Electronics

Hello guys, welcome back to my blog. In this article, I will discuss how to calculate RPM of dc and ac motor, formula to calculate RPM of motor, what is RPM, why it’s important to calculate RPM, how to calculate the speed of the motor, etc.

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How To Calculate RPM Of DC And AC Motor

When running, monitoring, servicing, or replacing a motor, it’s necessary to know its specifications. One important measurement is revolutions per minute, or RPM, which represents the speed of a motor. In this guide, we’ll explain how to calculate the RPM of a motor and why it’s so necessary.

What Is the RPM of a Motor?

RPM is a measurement utilized to represent a motor’s speed. It stands for revolutions per minute and represents the rate at which the rotor is rotating, which is the number of times the rotor shaft makes a full rotation each minute. It can be done to measure the speed of motors, turbines, centrifuges, conveyors, and other devices.

Why It’s Important to Calculate RPM

Measuring motor RPM, as well as other quantities like torque, voltage, and power is necessary when choosing a motor for a given application. Calculating motor speed can help you pick the right kind of motor while replacing components and help you get better repair decisions. You also require to know RPM to control and monitor motor operation efficiently.

How to Calculate AC Motor RPM

To determine RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. Yourself then divide by the number of poles the motor has:

(Hz x 60 x 2) / number of poles = no-load RPM

AC Motor RPM Calculation Examples

Let’s take a look at some cases. For an AC motor, the number of poles and the frequency determine the no-load RPM. For a 60 Hz system with four poles, the calculations to discover RPM would be:

(Hz x 60 x 2) / number of poles = no-load RPM
(60 x 60 x 2) / 4
7,200 / 4 = 1,800 RPM

How to Calculate DC Motor RPM

The emf equation of DC motor is given by

Here, N = speed of rotation in rpm. P = number of poles. A = number of parallel paths. Z = total no. conductors in the armature.

This was about how to calculate RPM of dc and ac motor. I hope this article ” How To Calculate RPM Of DC And AC Motor ” may help you all a lot. Thank you for reading.

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