External Rotor Switched Reluctance Motor Research Articles

An innovative and non-intrusive Hall effect sensor-based rotor position detection system for external rotor switched reluctance motor

An innovative and non-intrusive Hall effect sensor-based rotor position detection system for external rotor switched reluctance motor

Design and optimization of an external-rotor switched reluctance motor for an electric scooter

In order to reduce the global carbon foot print, the need of the hour is to provide pollution free and economically viable electric vehicles (EVs) as potential alternatives to the conventional ones. Amongst the different traction motors employed in EVs, switched reluctance motors (SRMs) being magnet-free, rugged in construction and fault-tolerant is a potential forerunner for automotive applications in the near future. Therefore, in this work, an external-rotor (ER) SRM has been designed for an electric scooter application. The proposed 4-phase SRM configuration comprises of 8 and 10 poles on the stator and rotor respectively. To achieve a well-balanced design with due consideration to the various performance indicators, a multi-objective design optimization (MOO) has been performed using particle swarm optimization (PSO). The optimization was based on the results obtained from the two-dimensional (2D) electromagnetic static finite element analysis (FEA) which aimed to maximize average torque, efficiency and minimize torque ripple respectively. In comparison to the preliminary design, the optimized ER-SRM demonstrated an increased average torque and decreased copper loss by 3% and 14% respectively. The large scale of simulations performed and the results thereby obtained confirmed that the proposed SRM design met the performance demands of the electric scooter application. The average torque at the rated and the maximum speed exceeded the desired torque requirements demanded by the electric scooter by 13.1% and 42.2% respectively.

Phase flux linkage estimation of external rotor switched reluctance motor with NARX neural network

Phase flux linkage estimation of external rotor switched reluctance motor with NARX neural network

GA and PSO Based Approaches for Fast Optimization of External Rotor Switched Reluctance Motor Design Parameters

GA and PSO Based Approaches for Fast Optimization of External Rotor Switched Reluctance Motor Design Parameters

A Preference Multi-objective Optimization Method for Asymmetric External Rotor Switched Reluctance Motor

A Preference Multi-objective Optimization Method for Asymmetric External Rotor Switched Reluctance Motor

Source of Acoustic Noise in a 12/16 External-Rotor Switched Reluctance Motor: Stator Tangential Vibration and Rotor Radial Vibration

Compared with internal-rotor switched reluctance motors (SRMs), external-rotor (ER) SRMs can show different vibration and acoustic noise behavior due to the differences in the designs, e.g. thinner rotor back iron to achieve smaller inertia, and longer stator pole height to improve the electromagnetic performance. This paper presents the considerations in the modeling and analysis of the acoustic noise sources of an ER SRM stator and rotor. The harmonic components of the stator tangential force density and rotor radial force density are analyzed and compared. The vibration modes, the vibration behavior, and acoustic noise of the stator and rotor are also compared. A 12/16 external-rotor SRM designed for a direct-drive E-bike application is used for the modeling, analysis, and experimental validation of vibration and acoustic noise. It is concluded that both the stator tangential vibration and the rotor radial vibration can be sources of the acoustic noise in an ER SRM.

Effect of Rotor Geometry on Peak and Average Torque of External-Rotor Synchronous Reluctance Motor in Comparison With Switched Reluctance Motor for Low-Speed Direct-Drive Domestic Application

This paper deals with the feasibility of developing an external-rotor synchronous reluctance motor for a low-speed direct-drive domestic application. Here, an attempt is made to identify the rotor geometry which provides high peak, average torque, and the saliency ratio in comparison with those of equivalent external-rotor switched reluctance motor (Ex-R SRM) which has already been developed and tested for the same application. In this context, six different rotor geometries are considered for the feasibility study and their performance characteristics are predicted using finite-element analysis. These results are compared with the equivalent size of Ex-R SRM, and finally, a feasible rotor geometry is proposed for further investigation and for the prototype designing.

Radial forces and vibration analysis in an external‐rotor switched reluctance machine

In external-rotor electric machine configurations, the rotor can be the major source of noise. This study analyses the distribution and the effects of radial forces and vibration in a 6/10 external-rotor switched reluctance motor designed for an E-bike application. The distribution of the electromagnetic force vector depends on the switching sequence, the geometry of the motor and the direction of rotation. Therefore, the effect of the switching strategy on the rotor radial force waveform has been analysed. It is shown that adjusting the turn-on angle can reduce the high rate of change of radial force waveform at the pole corners. The effect of switching angles on the reduction of rotor vibration has also been examined.

Switched Reluctance Motor Drive With External Rotor for Fan in Air Conditioner

This paper describes the developed three-phase 6/8 poles switched reluctance external rotor motor drive for a fan in air conditioner. The external rotor core structure and the internal stator core structure, the three-phase windings arrangement, the slotted claw, and the setting structure of the photoelectric transducers on the rotor position detector are illustrated. The electromagnetic field calculation results are given. The three-phase asymmetric bridge power converter was used in the drive system. The block diagram of the switched reluctance external rotor motor drive with closed-loop rotor speed control is given. The closed-loop rotor speed control is implemented using a fuzzy logic algorithm. The experimental tests of the developed prototype are made for driving the fan from 200 to 950 r/min. The comparison results of the two systems show that the input power and input phase current RMS value are lower in the developed three-phase 6/8 poles external rotor switched reluctance motor drive prototype with the fan than those in the induction motor variable-frequency variable-speed drive with the fan.

Experimental Study of the Wheel Drive EV with External Rotor Switched Reluctance Motor

Equiped with an electronic differential function in double wheel or four wheel electric vehicle drive, it must be driven by motor torque control precisely . Due to the nonlinear characteristics of the motor when the wheels switched reluctance motor drive, it is difficult to ensure motor torque and phase current relationship by the theoretical approach. This paper puts forward the experimental methods to get the different speed motor torque and given the relationship between the current , so as to make table, according to the rotation of the motor speed and torque requirements, the accurate switched reluctance motor torque control through given the current value in the future of the electric vehicle.

External rotor SRM with high torque per volume: design, analysis, and experiments

The purpose of this paper is to propose a new external rotor switched reluctance motor as a suitable prototype to produce high torque per volume with minimum leakage flux in small size applications. To evaluate the proposed configuration, its structure is introduced firstly, and the main characteristics such as flux density, flux linkage, self-inductance, mutual inductance, and output torque are analyzed numerically via three-dimensional finite element method. Subsequently, the obtained results are compared with those of a conventional motor; furthermore, the obtained results are validated in a laboratory set-up. The experimental and numerical analysis shows that this motor structure can help users to produce higher output torque per volume, with minimum leakage flux.