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Aghvel Niazi
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Join Date: Mar 2010
Location: Islamic Republic of Pakistan
Posts: 124
Good Answers: 14

Induction Motor Impedence

11/20/2010 7:44 AM

Can from induction motor nameplate we determine Impedance ( Rotor Impedance and stator Impedance) by using formulas?

Like

22 KW, 400 V, 50 Hz, D, 42 A, P.F 0.84, 1465 RPM

(Efficiency = 90 %, Losses = 2.442 KW)

Thanks in advance

(Actually I am working on VFD's using DTC mode and want to calculate the Power and for this purpose Rotor and stator Impedance are required)
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Aghvel Niazi
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Join Date: Mar 2010
Location: Islamic Republic of Pakistan
Posts: 124
Good Answers: 14
#1

Re: Induction Motor Impedence

11/20/2010 7:59 AM

I have determined Stator resistance using formula at FLC

Pscr= 3 (I *I) Rs and Rs = 0.1753 ohm (For all three phases)

Pscr= Stator core Losses= 927.36 W & I = Current flows in the stator = 42 A

(Percentage of losses according to California Energy Commission Report January 2003)

1. Stator core Losses (38 %) = 927.36 W 2. Rotor Core Losses(22%) = 537.24 W

3. Core Losses (20 %) = 488.4 W 4. W & F Losses (8%)= 195.36 W

5. Stray Losses (12 % )= 293 W
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Yuri B.
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Join Date: Jun 2009
Posts: 262
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#2
In reply to #1

Re: Induction Motor Impedence

11/20/2010 8:19 AM

Many VFDs, after first self tuning, will have measured, show, and save those values (and will use them for proper motor control).
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Aghvel Niazi
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Join Date: Mar 2010
Location: Islamic Republic of Pakistan
Posts: 124
Good Answers: 14
#3
In reply to #2

Re: Induction Motor Impedence

11/20/2010 8:22 AM

We have ACS 800 by ABB
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