1,721,333 research outputs found
Optimal Motor Design for Flux-Weakening Applications
No full textInnovative design and optimisation of electrical machines, Post-graduate Semina
Design Optimisation of Electric Motors by Genetic Algorithms
No full textAbstract: A new approach to the design
optimisation of thee-phase electric motors is
presented. The novelty lies in combining a motor
analysis procedure with a genetic algorithm to
optimise an objective function such as the motor
torque, the efficienyy, the material cost or some
other motor figures or a combination of these.
Two approaches to the motor analysis are
presented: the first is based on a fully analytical
procedure, while the second utilises the finite
element method. Some optimised design
examples, with reference to surface-mounted
permanent-magnet three-phase motors, are
included, and a co:nparison between the genetic
technique and the classical
algorithm optimisat:~on
hill-climbing direct-search method is made. A
discussion on the limitations and benefits of the
proposed design approach concludes the paper
A 30-krpm 1-kW PM motor for hand-tool applications
No full textThis paper illustrates the design criteria of a 30–krpm 1–kW permanent-magnet (PM) motor, highlighting its potentials and limits. The analysis procedures for computing magnetic and electrical quantities are presented, using both analytical and finite element approaches. The flux density in the motors part, the losses limit and the PM demagnetization limit are highlighted. Study of the thermal behavior as well as the mechanical limits are shown. Some different techniques to retain the PM are discussed. A motor prototype is in progress and some experimental results will be presented
Optimal State Reference Computation with Constrained MTPA Criterion for PM Motor Drives
No full textThis research proposes a procedure that maps a PMSM torque request onto optimal state (current) references. Combining the procedure with a dynamic (current) controller yields a torque controller. The maximum torque per ampere (MTPA) criterion is used to minimize conduction and switching losses. This research extends the concept to field-weakening operation to obtain high efficiency at any machine speed. The resulting constrained MTPA criterion is formalized as an optimization problem. Since it is difficult to solve directly, the maximum and intersection torque subproblems are identified. An algorithm is obtained that maps a torque onto an optimal state reference, and it is sufficiently efficient for real-time implementation. This method is compatible with a variety of state (current) controllers with/without PWM, SPM and IPM machines with saliency and reverse saliency, and a variable dc-link voltage. The proposed procedure relies on a sufficiently accurate torque model that may not be provided using rated machine parameters. Thus, an approach to compute locally optimized machine parameters is proposed that takes magnetic saturation into account. The concept is developed on a software-in-the-loop platform and evaluated on an experimental test bench
Finite Element Method for Electrical Machines Analysis and Torque Ripple in Permanent Magnet Machines
No full textInnovative design and optimisation of electrical machines, Post-graduate Semina
Fuzzy logic control of a switched reluctance motor drive
No full textThe paper deals with the fuzzy logic control of a switched reluctance motor (SRM) drive. The fundamentals of the fuzzy logic are first illustrated, pointing out the aspects related to the control under consideration. A fuzzy logic controller (FLC) of the motor speed is then designed and simulated. The results show that the use of an FLC in the speed loop gives the drive superior performances. In particular, the robustness of the drive has been proved
Performance analysis of an IPM motor with segmented rotor for flux-weakening applications
No full textNovel digital continuous control of SVM inverters in the overmodulation range
No full textA novel technique for space-vector modulation (SVM) inverters in the overmodulation range is presented. A unique algorithm manages the transition from the onset of overmodulation to six-step operation. The technique is suitable for a very simple digital implementation. Experimental results, obtained by a digital signal processor (DSP) board, are also included in this paper
A Space-Vector Approach to the Analysis and Design of Three-Phase Current Controllers
No full textThis paper proposes a novel systematic approach to the analysis and design of three-phase current controllers based on the space vector theory. Balanced load currents are considered so that the control is performed by two loops only
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