Losses analysis of direct drive PM generators suffering from demagnetizationLosses analysis of direct drive PM generators suffering from demagnetization Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2024-10-032022enDirect drive PM generators are critical machines and gain ground in the field of renewables, especially in remote applications. It is therefore important to guarantee their reliability and long uninterrupted operation. One faulty condition that may propagate over time, if undetected, is the demagnetization one. This paper studies the impact of partial demagnetization on the electromagnetic and thermal performance of PM generators. More specifically, the fault will create a magnetic imbalance leading to the creation of circulating currents in the stator coils. The circulating currents will in turn increase the machines’ losses and drop of efficiency and consequently increase the severity of the fault. Finally, the paper offers a fault severity analysis and relates it with the electromagnetic and thermal stress of the faulty PM machines.http://creativecommons.org/licenses/by/4.0/1737-17432022 International Conference on Electrical MachinesProceedings of the 2022 International Conference on Electrical Machines Goh S. Y. Fawzal Ahmad Syahid Rasid Syidy Ab Mueller Markus Gyftakis Konstantinos Γυφτακης Κωνσταντινος Institute of Electrical and Electronics Engineers Circulating currents Condition monitoring Demagnetization Efficiency Permanent magnet machines Thermal