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# Calculating rotor-bar inductance in a SCI motor

- To: <femm@yahoogroups.com>
- Subject: Calculating rotor-bar inductance in a SCI motor
- From: "Tielman Slabbert" <tielman01@telkomsa.net>
- Date: Wed, 30 Apr 2003 18:36:19 +0200
- References: <b8drsh+b1e0@eGroups.com> <000601c30d44$186ade60$14715142@robertmacy> <3EAD9E9B.9040302@ieee.org>

Hallo all I would like to know how to calculate the inductance ofa rotor-bar in a Squirrel cage induction motor using FEMM. I thought about using the block integral for magnetic field energy, and then calculate L from E = 1/2 L I^2. But I do not know what I must do do get the right flux density (which is neccesary since the inductance will change with B) in the motor without having the stator currents (which cannot be included if I want to use the magnetic field energy). I thought to distribute the rotor-bar currents sinusoidally according to the number of pole-pairs and then use a high rotor-bar current which will give the right flux distribution in the motor,but that will make it very difficult to use the method E = 1/2 L I^2. (what value must I then use for I in the equation) I also am not sure if one can actually use the above method to determine the inductance of a rotor-bar. (What I want to determine eventually, is the angle by which the bar-current will lag the induced emf in the bar) I would appreciate any help! (Sorry that I don't know so much about this field - I am still an undergraduate student in Engineering) Ivan Slabbert

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