1,041 research outputs found

    Future trends of power electronic converters

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    Future trends of power electronic converters

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    Power transfer stabilization of the three-phase contactless energy transfer desktop by means of coil commutation

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    In this paper, a method for removing the "dead spots" and stabilizing the position-sensitive power transfer efficiency in a three-phase contactless energy transfer desktop is presented. "Dead spots" result from the non-uniform distribution of the primary coils’ magnetic field intensities and the out-ofphase currents they are excited with. When the secondary coil is inside a "dead spot" there is no induced voltage, secondary current, or power transfer. The primary controller can not distinguish between a "dead spot" and a fully charged "receiving device" drawing no current. In this work it is shown, that a temporary unbalancing of the currents inside an activated primary coil cluster will result in an induced secondary voltage. The resultant secondary current flow will produce changes in the primary coils’ voltage and phase which can be detected by the primary controller. Following this method, the primary controller can detect "dead spots" and remove them by disabling and energizing different primary coils

    Novel moving coil tubular actuator with double sided PM array

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    Modeling and experimental validation of field distributions due to eddy currents in slitted conducting plates

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    The paper describes a 3D semi-analytical harmonic modeling technique, which is capable to model eddy current distributions in conducting structures and the associated fields. The induced current density and magnetic fields in the spectral domain are described, where a spatially varying conductivity of a conducting region is incorporated in the solutions of magnetic-field quantities. An experimental setup is used to measure the field distribution above differently shaped conducting plates, placed on top of a coil, in which eddy currents are induced. The measurement results are compared to simulation results and the perturbations are analyzed.</p

    Modeling and design optimization of a shaft-coupled motor and magnetic gear

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    This paper presents the modeling and design of an actuator consisting of an electrical motor and a magnetic gear. To minimize the overall actuator dimensions, both of the electromagnetic devices need to be optimally designed and matched. An issue in performing a simultaneous design as such arises from a high number of design variables that significantly increases the complexity of the optimization problem. A method to reduce the design variables is discussed in this paper, which is the application of response surface methodology (RSM) to represent the optimized torques of the electrical motor and magnetic gear as polynomial functions of their respective dimensions. Prior to the application of RSM, optimization problem statements are defined for the electrical motor and magnetic gear, for which the optimization objective and constraint functions are derived from analytical electromagnetic models of the considered electromagnetic devices

    A football kicking high speed actuator for a mobile robotic application

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    This paper presents the design and validation of a high speed reluctance actuator for a soccer robot. The actuator is used to shoot a regular sized soccer ball by applying different force levels directly to the ball. As the application requires force in only one direction, a plunger type reluctance actuator is selected. A capacitor is used to buffer energy from the battery of the robot. Through an IGBT, the energy is transferred from the capacitor to the actuator. Consequently, by applying pulse width modulation, the force applied by the actuator can be adjusted to enable a variable shooting power. The reluctance type actuator is designed using finite element analysis. The actuator is build and implemented in the robot providing the capability to shoot a ball from standstill over 12 meters with a starting speed of 11 m/s

    Brushless traction PM machines using commercial drive technology, part II: Comparative study of the motor configurations

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    In Part II a comparative analysis of the different brushless PM motor configurations, including exterior and interior rotor arrangements, salient and non-salient surface-mounted PM rotors, concentrated and distributed armature windings is presented. The comparative study is based on the developed design methodology given in the Part I of this paper. These motor configurations are investigated to be exploited for the particular automotive application - in-wheel hub traction motor of 80 kW, 1000 rpm base speed and constant power speed range of 4.5:1. It is shown that the interior surface-mounted non-salient PM motor with the concentrated winding is the most appropriate machine type for the considered application
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