Abstract
This paper investigates the influence of stator flux barriers on the short-circuit current (SCC) and braking torque of dual three-phase permanent magnet (PM) synchronous machine. In order to achieve high output torque and fault-tolerant capability, the flux barriers are commonly introduced on the armature teeth. Firstly, the SCC is analytically derived and it is found that the SCC amplitude is proportional to the PM flux linkage and inversely proportional to the self-inductance. The braking torque is proportional to the square of the PM flux linkage and inversely proportional to the self-inductance. Then, the equivalent magnetic circuit model of flux barriers is established. Its influence on flux linkage and inductance is analyzed, and the improvement mechanism of output torque and fault tolerance is revealed. Furthermore, the flux barrier width are optimized by finite element analysis and the theoretical analysis is verified. Finally, the experiments on the prototype machine are carried out for the validation.
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