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1.
Model for fatigue lifetime prediction of torsion bars subjected to plastic presetting
Vinko Močilnik, Nenad Gubeljak, Jožef Predan, 2011, original scientific article

Abstract: The torsion presetting of a spring-bar is a common technique for extending the elastic twist-angle and increasing torque, but it reduces fatigue lifetime.Spring-bars are used as shock absorbers in caterpillar machines. Spring-bars, made from high strength fine-grain steel, grade VCN, provide a high level of absorbed energy. Any slight change in the presetting procedure has a strong influence on fatigue-lifetime. Within the same loading range, springs can exhibit low-cyclic or high-cyclic fatigue behavior regarding different presetting levels. A model for fatigue-lifetime and shear-stress levels is proposed on the basis of performed tests. Considering prescribed fatigue tests, it is possible to optimize a spring bar's geometry, in order to survive the required number of cycles.
Keywords: presetting, torsion, spring-bars, fatigue, lifetime, cyclic fatigue, torque, spring steel
Published: 01.06.2012; Views: 961; Downloads: 48
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2.
Impact of magnetic saturation on the steady-state operation of the controlled induction motor
Petar Ljušev, Drago Dolinar, Gorazd Štumberger, 2003, original scientific article

Abstract: The paper presents a method for determination of the steady-state torque characteristics of the induction motor in the case of rotor field-oriented control (RFOC) with nonlinear magnetizing characteristic of the iron core included. The torque characteristics are determined for the constant stator current and the constant d-axis stator current. The characteristics obtained at a constant stator current are used to maximize the torque capability of the RFOC induction motor. The aim of the presented work is to obtain required steady-state torque with minimal stator current. Experiments show that the proposed selection of a magnetizing reference is promising.
Keywords: induction motor, torque characteristics, magentic saturation
Published: 01.06.2012; Views: 915; Downloads: 13
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