Dear Mr.Jonkman;
I’m modeling a wind conversion system based on a Hybrid Synchronous Machine using FAST v8.16 and interfacing with Matlab/Simulink.
In such generator, the excitation flux is created by permanent magnets and DC excitation coils. However, the electromagnetic torque rippling may reach 50%, which increases the mechanical stress of the structure. I’m wondering if there is a norm that defines the allowed torque rippling please? To what limits (percentage) I may tolerate this rippling?
Best reagrds.