Electric Motors

Hi...

I need to know about the efficiency of 3 phase electric motor where i have only input voltage,current,frequency & rpm.

What is the formula to find the efficiency?


asked 12/14/2016
Manick2
Manick

3 Answers

an electric motor is an electrical machine thats convert electrical energy to mechanical energy most electric motors  operate through the interaction between the motors magnetic field and winding currents to generate force in the form of rotation
answered 2/8/2019 rajkishor 2
rajkishor

E(efficiency)
Po(power out)
Pi(power in)

E=Po/Pi
thus, if you have the rating of the power delivered you just divide it and get your efficiency 

OR can use the following 

E=(746*HP)/[(746*HP)+(watts lost)] Where 746 is a constant and HP=horsepower

just my two humble cents, hope this helps
Regards

answered 9/21/2018 Expeditions Conquistador 2
Expeditions Conquistador
i think by using the relation of the losses so we can find the losses and subtract the losses we get output .
i think it is correct .we can get an appropriate efficiency. if wrong forgive me sir .
and please tell me the solution sir.
thank you
answered 12/30/2016 Thulasi 2
Thulasi

Your Answer

In order to provide an answer to this question, you must Login

I am flagging this question because...




10 inform moderator flags remaining

I am deleting this question because...




I am flagging this answer because...




10 inform moderator flags remaining

Flagging a Post

You have already flagged this post. Clicking "Remove Flag" below will remove your flag, thus reducing the count by one as well.

I am deleting this answer because...





What is LED?

Light Emitting Diodes (LED ) are increasing gaining favour in both the domestic and commercial sectors; due to their efficiency, sustainability and durability...

LED Replacement Light Bulb

The inventor of the first visible light-emitting diode makes history again this year as it begins to show customers a 40-watt replacement GE Energy Smart...

Motor Insulation

Insulation on a motor prevents interconnection of windings and the winding to earth.  When looking at motors, it is important to understand how the insulation...

Electromagnetic Fields - Exposure Limits

Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences.  A lot of research has been conducted...

Introduction to Cathodic Protection

If two dissimilar metals are touching and an external conducting path exists, corrosion of one the metals can take place.  Moisture or other materials...

Why a Sine Wave?

I received this question by email a few weeks. First thoughts was that it is a product of the mathematics of rotating a straight conductor in a magnetic...

New Mail Chimp

We've been sending out Newsletters on a regular basis for a few weeks now. To do this we have been using Google's Feedburner service. While Feedburner...

Periodic Electrical Installation Inspection – How Often?

How often installations are inspected is up to the owner of the installation, provided such durations do not exceed any regulatory maximums in force. ...

How to Size Power Cable Duct

Some colleagues had an issue earlier in the week on sizing conduits to be cast in concrete for some power cables . It became clear that none of us had...

Cables for MV Power Distribution - Earthed versus Unearthed Systems

Power cables can basically be classified into earthed and unearthed cables, where earthed and unearthed refer to the application for which the cable is...

Our website uses cookies so that we can provide a better experience.
To learn more about what cookies are and how to manage them visit AboutCookies.org