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WOLFRAM|DEMONSTRATIONS PROJECT

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

torque

⟶ back-EMF E

⟶ voltage drops at resistance and reactance R I + j X I

⟶ supply voltage V

⟶ current I

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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