Re: [femm] Induction Motor Tourqe Calculation

Hi All,
We have studied an induction motor which parameters are as follows:

Pf=3 kW
2p=2 (p=1)
nr (nominal)=2844 d/d
f=50 Hz
U=380 V (Star connected)
Stator Current (nominal)=6.6 A and stator winding turn=42

In "Problem" definition, to obtain nominal operating point values, we
have given the frequency 2.6 Hz (ws=s*w => ws=(3000-2844)/3000*50=2.6
Hz).
Motor nominal tourqe, Tn=3000*60/(2*pi*2844)=10.07 Nm.
In FEMM model, the tourqe for this operating point has obtained ~80
Nm, ie 8 times of nominal tourqe.
All of other values, such as leakage inductance, stator and rotor
resistance are very close to obtained from experimental results.
Why the tourqe values are not close?

The fem file of our model is attached.

Best regards.

A. Ihsan Canakoglu

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[Format] = 3.3
[Frequency] = 2.6000000000000001
[Precision] = 1e-008
[Depth] = 1000
[LengthUnits] = millimeters
[ProblemType] = planar
[Coordinates] = cartesian
[Comment] = "Example Induction Motor\n50 Hz, 3kw, 380 V"
[PointProps] = 0
[BdryProps] = 4

= "A=0"
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0

= "apbc1"
= 5
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0

= "apbc2"
= 5
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0

= "apbc3"
= 5
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0

[BlockProps] = 4

= "iron"
= 4000
= 4000
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 1
= 0

= "alüminyum"
= 1
= 1
= 0
= 0
= 0
= 0
= 34.450000000000003
= 0
= 0
= 0
= 0
= 0
= 1
= 0

= "Hava"
= 1
= 1
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 1
= 0

= "Sargi"
= 1
= 1
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 0
= 1
= 0

[CircuitProps] = 12

= "s1a+"
= 0
= 0
= 392
= 0
= 0

= "s2a+"
= 0
= 0
= 392
= 0
= 0

= "s3a+"
= 0
= 0
= 392
= 0
= 0

= "s4a+"
= 0
= 0
= 392
= 0
= 0

= "s1c-"
= 0
= 0
= 196
= 340
= 0

= "s2c-"
= 0
= 0
= 196
= 340
= 0

= "s3c-"
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= 196
= 340
= 0

= "s4c-"
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= 340
= 0

= "s1b+"
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= -196
= 340
= 0

= "s2b+"
= 0
= 0
= -196
= 340
= 0

= "s3b+"
= 0
= 0
= -196
= 340
= 0

= "s4b+"
= 0
= 0
= -196
= 340
= 0

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196 197 61.813803713392808 5 0 0 5
198 199 5.8208281288133659 5 0 0 5
[NumHoles] = 0
[NumBlockLabels] = 24
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