If \( \delta \) is load angle, the real power of 3-\(\phi\) synchronous motor is
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The power-angle curve of a cylindrical synchronous machine is purely sinusoidal ($P = P_{\max}\sin\delta$). Maximum power occurs at $\delta = 90^\circ$. For small values of $\delta$, $\sin\delta \approx \delta$, but the exact universal relationship is always direct proportionality to $\sin\delta$.