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The aim of this study is to explore the possibility of using flux switching linear tubular machines in a free piston energy conversion (FPEC) system. In FPEC systems, acceleration and therefore speed are often relatively high, which impose to have a reduced number of poles, meanwhile the cogging force will be relatively high. In order to reduce the cogging force two techniques are combined. The analysis...
This paper proposes flux switching permanent magnet machines (FSPMMs) with improved performance for robot applications. The phase-group concentrated-coil (PGCC) windings are adopted for high torque density. The influence of the combinations of stator-rotor poles on machine performance are studied, and the model with 12 slots and 13 poles (12S13P) is chosen for the highest torque. Then, to reduce cogging...
This paper proposes methods of parameters calculation of single-phase flux-switching permanent-magnet (S_FSPM) machine, in terms of copper loss property. The purpose of the study is to improve efficiency of S_FSPM through loss minimization by a mathematical design optimization approach. Furthermore, Influence of the asymmetry of airgap of a S_FSPM is investigated by finite-element analysis with particular...
The non-ideal factors of permanent magnet synchronous motor (PMSM) drive system, such as harmonics of rotor flux, cogging torque, and voltage source inverter (VSI) nonlinearity cause the speed ripple and deteriorate the speed and current regulation performance. To suppress these disturbances, this paper proposes a novel cascaded robust current and speed control stragety for PMSM. The proposed method...
Flux switching machines (FSMs) have been created to describe machine in which the stator tooth flux switches its polarity by following the motion of a salient pole rotor. In general, FSMs can be classified into three group clusters that are field excitation (FE) flux switching motor, permanent magnet (PM) flux switching motor and hybrid excitation (HE) flux switching motor. The main flux sources for...
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...
Single-phase Field Excitation Flux Switching Machines (FEFSMs) are increasingly considered as suitable candidate for high speed applications due to their variable flux capability and single piece structure of rotor. However, most of existing FEFSMs have overlap windings between armature and field excitation coil (FEC) which lead to increased size of motor, copper losses as well as material costs....
The influence of permanent magnet (PM) length on electromagnetic performance of a flux switching PM machine, including torque characteristics, loss, and efficiency is investigated in this paper by finite element (FE) analysis. FE results show that the average torque per PM volume, cogging torque and torque ripple can be improved by optimizing PM length. More importantly, for achieving a higher average...
Axial flux permanent-magnet machines have gained popularity in the last few decades because of their higher torque at low speed and better power density compared with radial flux machine [1], moreover, due to its inherently short axial length, they find applications where the used conventional PM machines are not appropriate, such as hybrid traction motors [2]. However, the major undesired effects...
There is a growing demand for the actuators that could fulfill the discontinuous operation requirement of holding at a certain position for a desired period of time. This can be found application in power assistive devices and switching adapters. Recently, the use of appropriate cogging torque to affix the actuator at a fixed position without electric energy became an attractive solution of concern...
With the great concerns on alleviating the pollution on the environment and traffic congestions; there is a trend for developing the electric vehicles [1], [2]. For such drive system, the in-wheel machines draw the main attention due to its relative higher torque density and compact structure [1]. With the permanent magnet (PM) located on the stator teeth, the flux switching permanent magnet machine...
Hybrid electric vehicles (HEVs), using combination of an internal combustion engine (ICE) and one or more electric motors, are widely considered as the most promising clean vehicles. The only machine that already installed for HEVs is interior permanent magnet synchronous machine (IPMSM) where it has developed to enhance power density of the machine. Despite of fine operated and superior performances,...
A new structure of field excitation flux switching motor (FEFSM) as an alternative candidate of non-Permanent Magnet (PM) machine for HEV drives is presented in this paper. Design principles and initial performances of the proposed motor at various rotor pole numbers with 12 stator slots are demonstrated. Initially, the coil arrangement tests are examined to validate the operating principle of the...
Power press machines are machines used to forge sheet metal to a particular shape using forging tools (dies). The sheet metal to be forged is placed on a die and a force of required magnitude is applied, by the motion of a ram, to get a definite shape. The force applied may be anywhere between 10 tons and 160 tons.
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