P. Andrada

Sensitivity Analysis of Geometrical Parameters on a Double-Sided Linear Switched Reluctance Motor

This paper presents a detailed sensitivity analysis of the effect of several geometrical parameters on the performance of a double-sided linear switched reluctance motor (LSRM). The analysis was conducted in two dimensions using finite-element method and takes into account only one part of the LSRM. This paper first investigates the powerful influence of stator- and translator-pole widths on force profiles. It then shows how these performance parameters are influenced by stator-pole length, translator-pole length, stack length, yoke length, and air gap. Experimental results confirm that the 2-D finite-element sensitivity analysis proposed in this paper may prove to be a useful tool for optimizing the geometry of a double-sided LSRM.

An analytical approach to the thermal design of a double-sided linear switched reluctance motor

The purpose of this paper is to provide an analytical approach to the thermal behavior of a longitudinal flux flat linear switched reluctance motor (LSRM) suitable for the early stages of motor design. The approach uses a thermal model based on lumped parameters and adapted to the particularities of LSRMs. The thermal network is solved using the widely recognized Matlab-Simulink software. The proposed analytical approach was verified by means of experimental measurements and thermographic analysis.

A Novel Type of Hybrid Reluctance Motor Drive

In this paper, a novel type of hybrid reluctance motor (HRM) drive is presented. This new motor is characterized by a stator formed by a combination of independent magnetic structures, each one composed of an electromagnet, the magnetic core with one or several coils wound on it, associated with a permanent magnet disposed between their poles. The rotor has the same configuration of a switched reluctance motor (SRM) without any coil, magnets, or squirrel cage. A particular case of this HRM, with three electromagnets with permanent magnets in the stator and five salient poles in the rotor, is studied. The motor is then analyzed and simulated. Finally, experimental results are given, and this type of motor drive is compared with the SRM drives of the same size. This new type of HRM does not present cogging torque and has higher power and efficiency than an SRM of the same size.

Improving efficiency in switched reluctance motor drives with online control of turn-on and turn-off angles

A current controlled switched reluctance motor drive for variable speed applications with efficiency optimisation is presented. Firing angles are computed online, the turn-on is calculated by means of the rule of Bose, and the turn-off is calculated using the general theory of the optimal turn-off angle proposed by Gribble. In steady state operation, the initial selection of firing angles is fine-tuned by means of an algorithm that minimizes the input power of the drive. A 6/4 switched reluctance motor drive prototype was tested and the experimental results show an improvement in online efficiency, a good steady-state performance and no deterioration in the dynamic response. An efficiency comparison with a commercial vector-controlled induction motor drive of the same size is also included

Environmental and life cycle cost analysis of a switched reluctance motor

This paper presents an analysis of the environmental and life cycle costs of a switched reluctance motor (SRM) drive. The analysis was carried out according to the Energy-Using Product Directive (EuP 2005/32/EC) and following the Methodology for the Eco-Design of Energy-Using Products (MEEUP methodology). The base case model adopted is an 8/6 SRM with 1.5 kW of output power that can be considered representative of the small power range. The analysis shows that SRMs could generate large savings comparable to or even better than those of Eff1 three-phase induction motors in the use phase.

A new power supply system for AC contactor ride-through

This paper describes a new power supply system that enables an AC contactor to ride through power grid disturbances. The proposed system is implemented in an electronic device that is connected to the contactor coil. The electronic device consists of a power conversion and excitation circuit, a control circuit, an immunity circuit and a shutdown circuit. It does not disturb the contactor operation and can be adapted to almost all types of electrical contactor. Experimental tests have demonstrated the effectiveness of the proposed electronic device.

Post-fault performance of a fault-tolerant switched reluctance motor drive

Switched reluctance motor (SRM) drives are well suited for use as fault tolerant drives. After identifying and isolating a fault that may occur, these drives can continue to operate and maintain the rated output without the faulted phase, although they do exhibit some performance disturbances. This paper presents an SRM drive with fault tolerant capabilities and analyses its post-fault performance. This analysis, based on experimental study using a prototype SRM drive, emphasizes certain magnitudes that exhibit external effects such as vibration, noise and temperature

Design procedure for a longitudinal flux flat linear switched reluctance motor

Abstract This article presents a new comprehensive design procedure for longitudinal flux flat linear switched reluctance motors. The design process comprises all the steps from detailing the specifications to sizing the prototype to validating the design, and it can be applied to three types of flux flat linear switched reluctance motors: single sided, double sided, and modified double sided. The design is based on an analytical formulation of the average translation force determined using a simplified non-linear energy conversion loop. Special emphasis is devoted to the calculation of the number of turns per phase. A two-dimensional finite-element analysis, corrected to take into account end effects, and a lumped parameter thermal analysis were used to refine and/or validate the design. Finally, a linear switched reluctance motor prototype was built following the proposed design and was verified by experimental measurements.

Assessment of Linear Switched Reluctance Motor's Design Parameters for Optimal Performance

Abstract This article presents an exhaustive study about the influence of some design parameters, such as the number of phases, pole stroke, and current density, in the behavior of a linear switched reluctance motor. The linear switched reluctance motors performance is assessed, taking into account a set of quality indices, which are the energy conversion loop quality factor, propulsion force per unit of primary steel volume, per unit of copper mass, per unit of air-gap surface, and force ripple factor. The study is carried out by means of two-dimensional finite-element analysis. Finally, the results are discussed, and as a consequence, a set of linear switched reluctance motor configurations with optimal performance according to the quality indices is defined.

New linear hybrid reluctance actuator

In this paper a new type of hybrid reluctance actuator is presented. This linear hybrid reluctance actuator is a two phase double sided actuator in which the stator is composed by four normalized U cores, each with a coil wrapped around the yoke connecting the two arms of the core or with two coils wound on each of the arms and a permanent magnet placed near the air gap between and in contact with both arms. The mover is comprised of rectangular poles without connecting iron pieces between them but mechanically joined by non-magnetic mounting parts. The magnets are arranged so that their flux is in parallel to the flux created when the coils are energized, both fluxes are added and the total reinforced flux links the stator and the mover. But when no currents flow through the coils no flux crosses the air gap, and the flux of the magnets is closed through the back iron that supports them. An analysis and simulation of the motor using 2 D finite element and MATLAB Simulink is carried out. Finally, a comparison of this type of actuator with respect a linear reluctance stepper motor of the same size is shown.