1,720,971 research outputs found
Mechanical flux weakening methods for the achievement of a very wide constant power speed range in automotive applications
No full textPermanent Magnet Machines are widespread in the automotive industry, thanks to their high torque density and high efficiency. In automotive applications such as, for example, integrated starter alternators, a very wide Constant Power Speed Range is also required, for electricity generation on-board. To maintain a constant voltage, flux weakening must be employed during generation. With the conventional Electrical Flux Weakening methods, considerable amounts of current would have to be consumed to weaken the strong flux linkage from the magnets, which results on an efficiency decrease. Conversely, mechanical methods adjust the linked flux by manipulating the position of certain machine parts, avoiding the consumption of current. Thus, Mechanical Flux Weakening might be more suitable for the automotive applications, where a very wide Constant Power Speed Range is required, while preserving high levels of motoring torque capabilities. In the present Literature Review, various implementations of Mechanical Flux Weakening, from several authors, are analyzed and compared. The aim is to gain insight on the effectiveness of this method, in comparison with the electrical one, on fulfilling the mentioned automotive requirements
Development and Testing of a High Performance Direct-Wheel Drive System for a Dual-Power Electric Vehicle
No full textGenerator topologies for horizontal axis tidal turbine
No full textOver the last decade, research on technologies to exploit tidal current kinetic energy for renewable electricity generation has had a significant growth. However, as to date, there is not a consensus worldwide on standard Power Take-Off (PTO) systems, due to the current immaturity of tidal energy converter technologies. In most cases, mechanical/electrical power conversion follows well-proven technologies derived by the mature wind-energy sector. However, the peculiarities of tidal energy resource impose ad hoc technology solutions. In this paper, different generator topologies and recent developments for marine tidal energy systems are reviewed and compared. The aim is to provide an overall perspective and identify areas for further development. Among considered technologies, the direct-drive permanent magnet synchronous generator by the full-rated frequency converter (FFC) represents an appealing solution, for reduced system complexity and maintenance requirements and possibility to develop smart Maximum Power Point Tracking (MPPT) strategies
Design and Characterization of a Radial Flux Wound Field and Permanent Magnet Hybrid Excitation Synchronous Machine
No full textThis paper presents the design and experimental characterization of a radial flux (RF) hybrid excitation synchronous machine (HESM) topologically realized with two coaxial rotor sections, a salient pole wound field (WF) section and an interior permanent magnet section (PM). The machine design choices are analyzed with FEA simulations to predict the behavior at no-load and at nominal load. A no-load 10:1 voltage regulation and CPSR is experimentally characterized along with a partial load dynamometer mapping
Analytical Sizing of Radial Flux Hybrid Excitation Synchronous Machines
No full textThis paper presents a sizing equation system for radial flux (RF) hybrid excitation synchronous machines (HESMs) with coaxial rotors. The system of sizing equations is derived integrating existing literature, mechanical, magnetic, thermal and control strategy considerations and coupled to a computationally-efficient finite element analysis (FEA) to assist the design of wide constant power speed range (CPSR) HESMs
Experimental Course on development Of a DSP- Based Digital Control Algorithm for Electrical Drives
No full textIntegration of an axial flux brushless motor for home automation.
No full textThis paper outlines the steps in designing an electrical drive with a brushless motor for home automation. Two purposes have been taken into account. First is the need of effective integration among the involved fields, i.e. motor design, control algorithm evaluation,. data transfer requirements, component integration in a domestic network. Second is the accurate choice of solutions compatible with low-cost technologies. The drive here considered is based on an axial flux brushless motor and emphasis is put on position and speed transducers, which constitute elements of weakness into the drive and contribute significantly to the total cost of low power applications. The key section in the control algorithm is the angular position detection and angular speed estimation. This is based on a set of three Hall effect sensors which seems to be a very low cost solution, offering, a good start point for more precise position reconstruction. The drive connection to a commercial communication network is finally discussed and propose
On Winding Manufacturing Technologies for Coreless Axial-Flux Permanent-Magnet Machines
No full textThis paper presents a comparison of Litz-wire-based and PCB-based stators for coreless axial-flux permanent-magnet (C-AFPM) machines. Manufacturing challenges for both winding technologies are analyzed in depth. Attention is paid to machine capabilities and small-scale series production viability. This paper examines stator designs using concentrated trapezoidal non-overlapped coils. Comparative 3D FEA and experimental tests on two machine prototypes
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