New Sensorless Field-Oriented Control for Six Phase Induction Machines By Sathish Kumar.K.S Edited By Sarath S Nair

Introduction SPIM –Six phase Induction machine Sensorless vector control technique Reference Model Model of SPIM

SPIM Two three phase stator windings spatially shifted by 30 electrical degrees.

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

Model of SPIM The SPIM is a double-six-dimension system(six stator and six rotor) Decomposed into three double-two- dimension orthogonal subspaces, (α,β),(z1,z2),(o1,o2)

Contd.. y= electrical angle b/w the two three phase stator winding

Machine Model in (α,β)

Machine Model in (z1,z2),(o1,o2)

Indirect Vector Control of SPIM

Contd.. The mechanical equation is the following in which J is inertia coefficient,and

Induction motor and model

Block diagram of overall system

Conclusion A new sensorless vector control for six phase induction machines, without flux and speed estimations was studied.

References 1.IT.A.Lipo, A d-q model for six phase induction drives,proc.Int. Conf.Electrical Machines,vol.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 ,sept/Oct J.Holtz, Sensorless Control of Induction motor Drives,Proc.of the IEEE, vol.90,no. 8,Aug.2002.

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