Edge-Quality Effects on Mechanical Properties of Stamped Non-Oriented Electrical Steel

Virupakshappa Lakkonavar; Swaroop Kavi; Peggy Jones; Margarita Thompson; Yew Sum Leong; Paul Crepeau

doi:10.4271/2020-01-1072

The market for electric vehicles and hybrid electric vehicles is expected to grow in the coming years, which is increasing interest in design optimization of electric motors for automotive applications. Under demanding duty cycles, the moving part within a motor, the rotor, may experience varying stresses induced by centrifugal force, a necessary condition for fatigue.

Rotors contain hundreds of electrical steel laminations produced by stamping, which creates a characteristic edge structure comprising rollover, shear and tear zones, plus a burr. Fatigue properties are commonly reported with specimens having polished edges. Since surface condition is known to affect fatigue strength, an experiment was conducted to evaluate the effect of sample preparation on tensile and fatigue behavior of stamped specimens.

Tensile properties were unaffected by polishing. In contrast, polishing was shown to increase fatigue strength by approximately 10-20% in the range of 10⁵-10⁷ cycles to failure.

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Edge-Quality Effects on Mechanical Properties of Stamped Non-Oriented Electrical Steel 2020-01-1072

SAE MOBILUS