# Comparing Open-Loop and Closed-Loop Operation of a Synchronous Motor

Comparing Open-Loop and Closed-Loop Operation of a Synchronous Motor

This Demonstration compares open-loop and closed-loop operation of a non-salient pole synchronous motor. Non-salient implies that the reactance is equal along every axis due to the uniform airgap between stator and rotor. The voltage vectors and the current vector in the - coordinate system are shown for the case of open-loop and closed-loop operation. The motor torque is proportional to the component of the current vector . In the case of closed-loop operation the current vector is always parallel to the axis.

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