Hassan Ali Soomro

New Topology of Single-Phase Segmented Rotor Field Excitation Flux Switching Machine for High Density Air-Condition

Various topologies of 3 phase and single phase Field Excitation Flux Switching Machines (FSMs) have been develop recently due to the advantages of veriable flux capability of DC Field Excitation coil located on the stator as well as robust single piece rotor structure suitable for high speed applications. However, the fundamantel principles of the develop machine with salient pole rotor, requires overlap winding between armature and FEC, creating the problems of high end coil, huge size of motor as well as high copper losses. Therefore, in this paper, a new topology of single phase segmented rotor FEFSM with 12S-6P configuration is presented with the advantage of non overlap armature and FEC windings, a smaller machine with low copper loss is designed. In this study, the principle of single phase 12S-6P with segmental is an investigated using 2D-FEA finite element analysis to validate the torque, speed and power characteristics. As conclusion, the proposed design is suitable for high density air-conditioner because 1kW power generated at 1.8Nm and the corresponding speed of 4977r/min.

Performance Comparison and Analysis of (HEFSM) and (FEFSM) Using Segmental Rotor Structure

This paper presents a new structure of hybrid excitation flux switching motor (HEFSM) using segmental rotor and the comparison of HEFSM and FEFSM using segmental rotor is performed to find the best candidate for hybrid electric vehicles (HEV). (HEFSM) using segmental rotor contains both the FEC and PM on the stator to produce maximum flux linkages. Initially, the coil arrangement tests are examined to validate the operating principle of the (HEFSM) using segmental rotor. Moreover the profile of flux linkage, cogging torque, and torque characteristics at various armature current densities of both the (HEFSM) and (FEFSM) using segmental rotor are observed based on 2D-finite element analysis (FEA). Initially performances show that HEFSM using segmental rotor produces torque of 18 Nm with low cogging torque and sinusoidal flux waveform. Thus by further design optimization the proposed motor will effectively achieve the target performances.

Development of a novel permanent magnet flux switching machine prototype for light weight electric vehicles

Increasing transportation efficiency is the best place to start efforts to reduce emission of carbon dioxide (CO2), which is a primary culprit in global warming. This has gained an interest in electric vehicles (EVs) instead of conventional internal combustion engine from automakers, governments and customers to make it as more attractive research. Since electric motors are the core of EVs, it is a pressing need for researchers to develop advanced electric motors. As one of the candidates, flux switching machine (FSM) is introduced in order to cope with the requirement. This paper outlines an investigation and prototype development of a novel FSM employing alternate circumferential and radial flux (AlCiRaF) permanent magnet (PM) configurations. At first stage, the machine general construction, operating principle and design concept of proposed machine is portrayed. Subsequently, coil arrangement test, 3-phase flux linkage, back emf, cogging torque, output torque and power are analyzed by two-dimensional finite element analysis (2D-FEA) using JMAG solver while Solidwork software is utilized for the fabrication process. Accordingly, the simulated result shows that the proposed AlCiRaF PMFSM machine attains its highest output torque performances of 46.55 Nm and output power of 18.5kW at maximum Ja of 30Arms/mm2, respectively suitable for light weight EV.

Stage wise Control Algorithm for Exciting Single Phase Flux Switching Motor

Flux switching motors falls into a special category of reluctance motors having a rotor free from magnets and windings. However this simple and robust structure demands sophisticated driving mechanism mainly due to absence of rotating MMF in the rotor. This paper discuss about the implementation of proposed algorithms for starting and control of a specific type of flux switching motor named Field Excited Flux Switching Motor (FEFSM). Since it has been designed for low power domestic applications, so the proposed control strategy is designed in a way that it can be implemented without needs of absolute position sensors and current sensors. For position detection, it merely need a simple pair of Infrared transceiver sensor. Initially motor parameters are discussed, then highlighted on the proposed control strategy. Moreover its detailed stage-wise algorithms are illustrated via a series of flow charts. A mechanism for eliminating undesired rotor locking is also discussed. Finally experimental results are discussed including oscilloscope readings of sensor and motor phase voltage.

Electromagnetic analysis of outer rotor permanent magnet flux switching machine for downhole application

Permanent magnet flux exchanging machine (PMFSM) with every single active part situated on the stator has a few appealing elements contrasted with customary induction machine because of its high torque and power density, better efficiency, simple and vigorous rotor structure, however, less were developed for downhole application due to harsh environmental conditions. In the past, a large portion of designed PMFSMs for downhole applications were mainly focused on inward rotor design, and hard to discover research work on external rotor design. Therefore, this paper presents the electromagnetic examination of PMFSM with outer rotor configuration for downhole application. Basically, the principle of operation is described briefly then the geometric topology of proposed configuration is portrayed in detail. Finally, the no-load and load examination are actualized keeping in mind the end goal to research the underlying performance of the proposed design.

Primary study of a new permanent magnet flux switching machine over straight and spanned rotor configurations

Purpose The purpose of this paper is to address a fundamental study and performance analysis of a proposed 6Slots-10Poles permanent magnet flux switching machine (PMFSM) using straight rotor (StR) and 6Slots-8Poles PMFSM with spanned rotor (SpR) structure. Design/methodology/approach Design configuration of the proposed machine was developed using commercial finite element analysis package and JMAG-Designer V.14 software, which provides two-dimensional finite element solver throughout the investigation. An electromagnetic performance analysis is carried out and compared over the two proposed topologies which consist of machines no-load and under-load conditions. Findings This paper demonstrates the finding of the proposed StR structure which consist of more favorable three-phase sinusoidal feature, lower cogging torque and higher output torque. Flux density attributes reveal higher established magnetizing flux concentration in StR compared with SpR. Consequently, the StR structure requires low armature current before it may start to rotate and provides better robust construction with less material consumption and cost. Originality/value This paper describes the novel design of a new PMFSM configuration pertinent for high-speed applications.

Analysis of 24Slot wound field salient rotor switched-flux machine based on 2D-FEA

Purpose The paper aims to propose and compare two new structures of a three-phase wound field salient rotor (WFSR) switched-flux motor (SFM) with 24 stator slots and 10 or 14 rotor poles, respectively, for high-speed operation. Design/methodology/approach The paper outlines the motor general construction and design concept of proposed machines. Flux linkage, average torque, rotor mechanical strength and torque–speed characteristics of both machines were analyzed and compared by two-dimensional finite element analysis (2D-FEA). Deterministic optimization method was adopted to enhance the characteristics of 24Slot-10Pole WFSR SFM. Findings The paper provides simulation results and discusses how 24Slot-10Pole WFSR SFM structure is superior to the 24Slot-14Pole in the aspects of flux linkage, average torque and power. It further concludes that the optimized design of 24Slot-10P has achieved 58 and 72 per cent higher average torque and power compared to initial design, as well as high average torque and power compared to 24Slot-14P design. Originality value Optimized structure of the 24Slot-10Pole WFSR SFM with non-overlapping windings has been proposed.

Performance investigations of flux switching machines for light weight electric vehicles

An interest in electric vehicles (EVs) from automakers, governments and customers due to concerns on the environment makes it as more attractive research. Since electric motors are the core of EVs, it is a pressing need for researchers to develop advanced electric motors. As one of the candidates, flux switching machine (FSM) is introduced in order to cope with the requirement. This paper outlines an investigation of 3 FSM configurations namely permanent magnet (PM) FSM, field excitation (FE) FSM and hybrid excitation (HE) FSM. Initially, the machine general construction, operating principle and design concept of proposed machines are described. Next, coil arrangement test, 3-phase flux linkage, back emf, cogging torque, output torque and power of all machines are analyzed and compared by two-dimensional finite element analysis (2D-FEA). The simulated result shows that the proposed PMFSM machine attains its highest output torque performances of 25.74 Nm at maximum Ja of 30Arms/mm2, significantly 32.3% better than the HEFSM topology which comes in second place.

Comparative performance of FE-FSM, PM-FSM and HE-FSM with segmental rotor

Flux switching machines (FSMs), new type of electric machines with unique operating principles have been introduced and published recently. FSMs contain armature and excitation sources on the stator with robust rotor structure. According to rotor structure FSMs can be classified into two types namely salient pole rotor and segmental pole rotor. Various topologies have been studied and published using both rotor structures, however salient pole rotor has a demerit of less torque generation due to longer flux path resulting flux leakage surrounding the rotor. In this paper a new structure of hybrid excitation FSM (HEFSM) with segmental rotor is proposed and a comparative analysis with the invented field excitation FSM (FEFSM) and permanent magnet FSM (PMFSM) is presented. Initially, coil arrangement tests are examined to confirm the operating principle of HEFSM with segmental rotor. Moreover, the cogging torque, induced voltage, magnetic flux, torque at various armature current densities and power characteristics are observed based on 2D-finite element analysis (FEA).

Design Optimization of Single-Phase Outer-Rotor 8S-8P Hybrid Excitation Flux Switching Motor for Electric Vehicle

Nowadays, in-wheel motors applied in pure electric vehicles (EVs) propulsion systems have attracted great attention in advance research and development. In-wheel direct drive provides quick torque response, higher efficiency, weight reduction, and increased vehicle space. As one of alternative, a new design of outer-rotor hybrid excitation flux switching motor (ORHEFSM) for in-wheel drive EV is proposed. In this paper, the optimization design of single-phase 8S-8P outer rotor HEFSM is analysed. Open and close circuit of initial and final design is compared based on 2-D finite element analysis (FEA). The design optimization has been made on the initial design machine shows that there is great enhancement on torque and power.