Mahyuzie Jenal

Investigation of field excitation switched flux motor with segmental rotor

In this paper a three-phase field excitation switched flux (FESF) motor where both armature coil and field excitation (FE) coil placed on the stator is investigated. The rotor is design with separately segmental pole so that flux generated from FE Coil can be fundamentally placed in adjacent with flux of armature coil. Thus, the coil end length of both FE Coil and armature coil are reduced, hence increasing the motor efficiency when compared with FESF motor with single piece rotor, and overlapped FE Coil and armature coil windings. In this paper design investigation and analysis of 12S-8P and 24S-10P FESF motor with segmental rotor are investigated. Moreover, coil test analysis, FE Coil flux characteristics, flux interaction between FE Coil and armature coil, flux distribution, and torque characteristics are also compared. As conclusion, the 24S-10P FESF motor with segmental rotor gives much higher performance when compared with 12S-8P FESF motor.

2D-FEA Based Design Study of Salient Rotor Three-Phase Permanent Magnet Flux Switching Machine with Concentrated Winding

This paper presents a new structure of permanent magnet flux switching machine (PMFSM) with multiple different sizes of rotor pole width. A robust single piece salient rotor is used to modulate and switch the flux linkage polarity in the armature winding and become the fundamental mechanism of these types of machines. The methodology of two-dimensional (2-D) finite element analysis (FEA) is used to evaluate the electromagnetic performance of coil test including flux line distributions, three phase flux linkage, cogging torque as well as induced emf. The resulting performances are analysed based on the variety of rotor pole width to meet the requirement of direct drive propulsion of Electric Vehicles (EVs).

Design investigation of three phase HEFSM with outer-rotor configuration

Flux switching machines (FSMs) with the advantages of single piece of rotor and robust rotor structure become a popular research topic in recent years that suitable for various speed conditions. This machine combined the advantages of Switched Reluctance Machines (SRMs) and Permanent Magnet Synchronous Machines (PMSMs). Previously, most of developed FSMs are mainly focused on inner-rotor configuration, and hard to find research on outer-rotor FSM configuration. Therefore, this paper presents design investigation of three phase Hybrid Excitation Flux Switching Machine (HEFSM) with outer-rotor configuration. Primarily, design processes of the outer-rotor HEFSM especially for drawing parts, materials and conditions used, and properties setting are described in detail. Next, coil arrangement tests are also evaluated to confirm the principle operation of the machine and the phase sequence of each armature coil. Finally, DC field excitation flux capabilities at various current density condition, flux path and flux distribution, back-emf voltage and initial torque are also investigated.

Magnetic Flux Analysis of a New Field-Excitation Flux Switching Motor Using Segmental Rotor

Recently, a three-phase field-excitation flux switching motor (FEFSM) with salient rotor structure has been introduced with their advantages of easy rotor temperature removal and controllable field excitation coil (FEC) magnetic flux particularly suitable for high torque, high power, and high-speed diverse performances. Nevertheless, the salient rotor structure is found to lead a longer magnetic flux path between stator and rotor producing weak flux linkage along with low torque performances. Besides, the overlap armature coil and FEC windings yield high coil end length, producing much high copper loss and large motor size. In this paper, a new FEFSM using segmental rotor with non-overlap armature coil and FEC windings is proposed. The shorter magnetic flux path of the proposed segmental rotor is noticeably more focused to produce much higher torque while the non-overlap armature and FEC will reduce the copper loss and motor weight. Both FEFSMs with salient and segmental rotors are designed using 2-D-FEA JMAG Designer version 14.1 for comparison. As a result, magnetic flux of the segmental rotor design is 11 times higher than the salient rotor structure mainly due to shorter magnetic flux linkage between two stator teeth and single rotor segment. The torque and power of 0.91 Nm and 293 W, respectively, are obtained from the new FEFSM which are much higher than salient rotor design. In addition, the simulation and experimental results show a good agreement in back-electromotive force amplitude and waveform at various speeds, as well as similar increment of torque versus FEC current characteristics. As the conclusion, the proposed FEFSM with non-overlap and segmental rotor structure has produced much higher flux, with significant improvement of torque and power performances compared with existing FEFSM with salient rotor.

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.

Load analysis of dual Rotor Hybrid Excitation Flux Switching Machine (DR-HEFSM)

Dual Rotor Hybrid Excitation Machine (DRHEFSM) idea mainly comes from the existing Hybrid Excitation Flux Switching Machine (HEFSM). HEFSM has been tested and obtain remarkably result. The machine rivaled the Interior Permanent Magnet Synchronous Machine (IPMSM) and produce high performance when compared to Field Excitation Flux Switching Machine (FEFSM) and Permanent Magnet Flux Switching Machine (PMFSM). The DRHEFSM operating principle has been tested and confirmed to follow the three phase operating machine principle. Further load analyses are conducted in order to examine the performance of the DRHEFSM. Through the test, the machine torque, speed and power are able to identify. Even though the machine supply equal flux sources to inner and outer rotor, the performance of the inner rotor higher than outer rotor.

Performance comparison of wound field flux switching machines

A flux switching machine (FSM) with a segmented rotor and non-overlap windings is an attractive alternative for driving high torque density applications. However, a rotor with segments makes the motor less robust as well as difficult to be assembled, whilst, FSMs with salient rotor and overlap windings inherit high copper losses and less efficiency due to high coil volume. In this paper, performance analysis of a novel structure of FSM with non-overlap windings and salient rotor are compared with 10Slot-8Pole segmental and salient rotors FSM. Deterministic optimization is adopted to enhance the characteristics of proposed machine. Using two-Dimensional Finite Element analysis, the proposed optimized machine are found to exhibit high torque and power than 10Slot-8Pole segmental and salient rotors FSM.

DC-DC interleaved boost converter using FPGA

This paper presents the design of dc to dc Interleaved Boost Converter (IBC) which is controlled using Field Programmable Gate Array (FPGA). The output voltage can be controlled by Pulse Width Modulation (PWM) switching technique which is implemented on the Altera DE2-70 Board. An eight bit Analog to Digital Converter circuit is used to monitor the output current. The simulation is carried out using Matlab Simulink software and simulation on the designed waveform is conducted using Quartus II software tools. The frequency of the PWM output voltage is set to 40 kHz. Various detailed analysis has been done to investigate the benefits of IBC compared to conventional boost converter. Meanwhile, theoretical analysis and hardware prototype has been done to validate the result.

Control of power generated from linear generator

This paper explains the power generation profile of the linear generator by controlling the 3-phase rectifier as a control converter when it is attached to the linear generator. Normally, the linear generator without control converter will produce decreasing power profile when the time is increased. By controlling the converter, the power profile can be changed to more suitable profile which is applicable for the load. In order to change this power profile at the linear generator, the controller that can operate in the robust condition will be used due to the disturbances inputs of the linear generator. Here, the H∞ control theory will be implemented in order to change the output power profile of the linear generator.

An innovative off-grid permanent magnet flux switching generator for micro gas turbine in rural areas

This digest reviews extensively on preliminary analysis to obtain a 30 kW electric power generator and to apply Bio-methane to use it directly to micro gas turbine for electricity generation.