Agile UPC Vilanova

Peer Reviewe

Influence of equivalent circuit resistances on operating parameters on three-phase induction motors with powers up to 50 kw

This work shows the results obtained from studying the influence of equivalent circuit resistances on three-phase induction motors. The stator resistance, rotor resistance, and iron losses resistance affect the different motor operating variables (output power, current, speed, power factor, starting ratios, and maximum torque). These influences have been quantified, paying particular attention to the losses affected and their impact on efficiency. The study carried out does not apply optimization techniques. It evaluates the different influences of the equivalent circuit’s different resistances on its operation by evaluating applicable constructive modifications concerning available motors. The work has been limited to three-phase induction motors up to 50 kW and low voltage, with the nominal powers of the selected motors being 0.25 kW, 1.5 kW, 7.5 kW, 22 kW, and 45 kW. The tools used to carry out the study are analyzing the equivalent circuit and the simulation of the electromagnetic structure using a finite-element program. The variations proposed in each resistance for all the motors studied is not purely theoretical, as it is based on applying feasible constructive modifications, appropriately analyzed and simulated. These modifications are the variation of the conductor diameter in the stator coils, the change of the section of the rotor cage, and the selection of different ferromagnetic steel types. © 2021 by the authors. Licensee MDPI, Basel, SwitzerlandPeer ReviewedPostprint (published version

Torque ripple minimization for a Switched Reluctance Motor

This paper presents the desired current references in order to minimize the torque ripple for a Switched Reluctance Motor. From the torque equation, and using switch on and switch off angles, the desired current waveforms are obtained. Simulations validates the study and are compared with the constant current references casePostprint (published version

Replacing induction motors without defined efficiency class by IE class: example of energy, economic, and environmental evaluation in 1.5 kW—IE3 motors

This paper shows the results obtained from the study on the variables that have the greatest influence on the decision to replace three-phase induction motors, without a defined efficiency class and installed in industrial applications, with IE3 efficiency class induction motors. The work has been carried out on motors with a nominal power of 1.5 kW due to the availability of laboratory tests that have allowed us to accurately quantify the selected study variables. According to IEC 60034-30, between 0.75 kW and 4 kW is the greatest potential for energy savings in electric motors installed within the industrial sector. The tests carried out have made it possible to assess different operating conditions of the motor: direct power supply from the grid, electronic power supply using scalar control, and electronic power supply using direct torque control. The study has focused on three aspects: energy evaluation, assessing the savings potential; economic evaluation, based on indicators such as Payback Period and Net Present Value; environmental assessment, quantifying the impact indicators proposed by the Methodology for Ecodesign of Energy-related Products (MEErP). A sensitivity analysis has been carried out to quantify, through ratios, different operating points from those directly analyzed in the article.This work was supported by the Universitat Politècnica de atalunya under the project AGRUPS R-02140.Peer ReviewedPostprint (published version

Simulation of linear Switched Reluctance Motor drives

This paper presents a simulation model of linear switched reluctance motor drives. A Matlab-Simulink environment coupled with finite element analysis is used to perform the simulations. Experimental and simulation results for a double sided linear switched motor drive prototype are reported and compared to verify the simulation model.Postprint (published version

Minimization of torque ripple in switched reluctance motor drives using direct instantaneous torque

Torque ripple is an inherent characteristic of switched reluctance motor drives due to its double salient geometry and it is a serious drawback in applications that require smooth torque and high dynamic performances. This paper presents some contributions to the minimization of torque ripple in SRM using direct instantaneous torque control (DITC). Direct torque controller is simulated using Matlab/Simulink and then implemented in a DSPACE ACE kit 1006 CLP that includes a processor board with an AMD OpteronTM running at 2.6 GHz. Finally, experimental results are shown and they are compared with those obtained using conventional angle control.Postprint (published version

Influence of design parameters in the optimization of linear switched reluctance motor under thermal constraints

The objective of this paper is to present an original study for optimizing the size of the LongitudinalFlux Double-Sided Linear Switched Reluctance Motor (LSRM) under thermal and weight constraints. The performance is evaluated taken into account duty cycle operating conditions and thermal restrictions. The proposed approach couples Finite Element Analysis for magnetic propulsion force computation and Lumped Parameter Thermal Network for thermal transient analysis. The LSRMs design parameters are characterized by the number of phases and by their size denoted by the pole stroke. The operating conditions are the current density, the duty cycle and the admissible temperature rise of the insulation system. The grid search algorithm is used for solving the optimization problem. From the results, with the help of a novel multivariable optimization chart, a set of optimal configurations regarding to miniaturizations and downsizing of LSRMs is provided.Peer ReviewedPreprin

Electromagnetic evaluation of an in-wheel double rotor axial-flux switched reluctance motor for electric traction

Peer ReviewedPostprint (published version

Thermal performance analysis of the double sided-linear switched reluctance motor

This paper presents an exhaustive study about the propulsion force and the thermal performance of the double-sided flat Linear Switched Reluctance Motor (LSRM) according to the number of phases (m) and the pole stroke (PS). The analysis is performed by means of the Finite Element Method (FEM) for electromagnetic computations and a lumped parameter for thermal model (LPT) both linked to an optimization algorithm based on the Response Surface Methodology (RSM) in order to reduce the computing time. The results show the optimal design of LSRM from the point of view of the thermo-mechanical performance for a given insulation class and a duty cycle operating conditions

Segmented stator switched reluctance motor drive for light electric vehicle

The world market of electric light vehicles will significantly increase in the coming years. What will require the development of better high-performance drives with lowcost, and, if possible, free of permanent magnets. A segmented stator switched reluctance motor is presented to fulfill this objective because it has advantages over the conventional switched reluctance machines, such as segmented stator construction, stator shorter flux paths without flux reversal, and as a consequence, fewer iron losses. Simulations will demonstrate that the proposed segmented stator switched reluctance motor drive is suitable as a powertrain for light electric vehicles.This work was supported by the project TED 2021129912B-I00.Peer ReviewedPostprint (published version