Abstract__ This paper explores the fundamental magnetic response in vector controlled induction motors. Radial and tangential components of the electromagnetic force in the airgap of a vector controlled induction machine have been investigated. The study reveals the correlation between the average value and undulation of the force components to the stator currents in the synchronous reference frame. Furthermore, the flux and force density distributions for an induction machine with and without vector control, with rotor dynamic eccentricity, and with broken rotor bar (i.e. eccentric rotor) conditions have been compared. The studies have been performed using a transient Finite Element model of a 4-pole induction machine.
this paper presents the results of an investigation on components of the electromagnetic force in the airgap of an 8/6 Switched Reluctance Machine (SRM). Using Maxwell stress method variations of radial and tangential force components with respect to saliency of the machine and saturation effects have been studied. Access to distribution of the force components acting on the rotor and stator enables us to provide a more accurate picture of the torque generation and vibration in this family of electric machines. Furthermore, distribution of magnetic forces under multiphase excitation has been studied in details. Our findings show that bipolar excitation of SRM phases, resulting in a short flux path magnetic circuit, favors its efficiency and power quality while generating slightly higher torque with less pulsation. This is a significant improvement especially for automotive current intensive applications where the difference in price of power electronics components can be justified. An experimental, 2kW, 42 Volts, 8/6 SRM drive which has been designed and manufactured in our energy system laboratory was targeted for this study. In addition to our extensive Finite Element(FE) analysis, experimental work is being carried out on our motor to validate some of the findings of this investigation. 0-7803-7883-0/03/$17.00
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