Influence of Processing Strain on Iron loss of Brushiless DC motor

Kunihiro Senda, Kawasaki Steel Corporation


The influence of processing strain on the iron loss of a brushless DC motor was evaluated. From the loss calculation based on the flux density derived by the FEM method, the increment of motor iron loss due to the strain in the vicinity of the punched edge was estimated to be 6% of the total iron loss. Experimentally, iron loss deterioration due to core production was evaluated to be 16% by means of the motor loss measurement before and after stress-relief annealing, which means the edge strain takes 1/3 of total deterioration at manufacturing process.

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