Browsing by Author "Osaloni, F."

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    A control strategy for optimum efficiency operation of high performance interior permanent magnet motor drives
    (IEEE, 2003-11) Ojo, O.; Wu, Zhiqiao; Osaloni, F.; Omoigui, Michael
    This paper, using the concept of input-output linearization with decoupling, sets forth the speed control of the interior permanent magnet motor drives which simultaneously ensures the minimization of the losses-the copper and core losses. This control scheme is unique in that saturation dependent parameters such as the d and q axis inductances and the armature reaction dependent magnet flux linkage are included in the controller structure formulation and implementation. The proposed control scheme differs from known schemes which are either based on perturbation and search methods or on steady curve fitted graphs that map the command q and d axis currents based on reference torque. Unlike these methods, an optimization formulation that dynamically determines the reference currents/voltages required to achieve high performance speed control and total loss minimization is used. The control structure methodology, the nature of the variations of the machine parameters and how they influence the machine efficiency are clearly laid out.
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    The influence of magnetic saturation and armature reaction on the performance of interior permanent magnet machines
    (IEEE, 2003) Ojo, O; Osaloni, F.; Zhiqiao, Wu; Omoigui, Michael
    These effects are reflected in the classical qdo equivalent circuit model of the machine in the following fashion: the core loss is represented with a stator flux linkage dependent core loss resistance, the armature reaction effect is accounted for by the changing magnet flux linkage and magnetic saturation effect is reflected in the changing d and q-axis inductances of the machine. The steady-state modeling and analysis of the machine, the nature of the variations of the machine parameters and how they influence the machine torque and efficiency are clearly laid out and eventually confirmed by simulation and experimental results. The balance of the paper provides finite element analysis results for an experimental 2 hp IPM to further validate the conclusions drawn from calculation and experimental results.