# Two Reaction Theory – Salient Pole Synchronous Machine

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### Two Reaction Theory

#### The component which is acting along the direct axis can be magnetizing or demagnetizing. The component which is acting along quadrature axis is crossly magnetizing.These components produce the effects of different kinds.The below figure shows the stator MMF wave and the flux distribution in the air gap along the direct axis and quadrature axis of the pole.

The reluctance offered to the MMF wave is lowest when it is aligned with the field pole axis.This axis is called the direct axis of pole i.e. d-axis.The reluctance offered is highest when the MMF wave is oriented at 90° to the field pole axis which is called quadrature axis i.e. q-axis.