How to align the quadrature encoder for induction motor drive?

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yzou_ua

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I'm using quadrature encoder to feeback rotor position and how to do the alignment between zero position of rotor and rotor flux (rotor phase A)? And then how to align this position with stator phase A then?

As you might know, this is actually two alignment bet. 3 things...
Thx a lot!!
 

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