Transcript New Sensorless Field-Oriented Control for Six Phase

New Sensorless Field-Oriented
Control for Six Phase Induction
Machines
By
Sathish Kumar.K.S
Edited By
Sarath S Nair
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Introduction
•
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SPIM –Six phase Induction machine
Sensorless vector control technique
Reference Model
Model of SPIM
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SPIM
Two three phase stator windings spatially
shifted by 30 electrical degrees.
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control technique
• Does not required flux and speed
estimators
• It uses only different b/w stator current
of the mathematical model and
motor,then forces them to decay to zero
• Simpler and does not need high computation
time
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Model of SPIM
• The SPIM is a double-six-dimension system(six
stator and six rotor)
• Decomposed into three double-twodimension orthogonal subspaces ,
(α ,β),(z1,z2),(o1,o2)
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Contd..
y= electrical angle b/w the two three phase stator
winding
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Machine Model in (α ,β)
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Machine Model in (z1,z2),(o1,o2)
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Indirect Vector Control of SPIM
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Contd..
The mechanical equation is the following
in which J is inertia coefficient,and
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Induction motor and model
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Block diagram of overall system
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Conclusion
• A new sensorless vector control for six phase
induction machines, without flux and speed
estimations was studied .
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References
1. IT.A.Lipo,” A d-q model for six phase induction
drives”,proc.Int. Conf.Electrical Machines,vol.2,1980.
2. Y.Zhao & T.A.Lipo “ Space Vector PWM control of six-phase
Induction machine using space vector Decomposition ”,IEEE
Trans .industrial Application , vol 31,No.5 .11001109,sept/Oct 1995.
3. J.Holtz , “Sensorless Control of Induction motor
Drives,”Proc.of the IEEE, vol.90 ,no. 8,Aug.2002.
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