Design optimization of permanent magnet synchronous motors using response surface analysis and genetic algorithm

... The development of Permanent Magnet Machines 1.1.2 Features of permanent magnet motors Permanent magnet synchronous motors iii 1.2.1 Structures and operating principles ... with the analysis and design of buried type Interior Permanent Magnet Synchronous Motors (IPMSM) The objective is to develop a design optimization procedure for this type of motors that is more ... List of Figures 1.1 Magnetic characteristics of the main class of permanent magnets [2] 1.2 Evolution of the magnetic material during the 20th century [2] 1.3 Partial demagnetization of a permanent...

Analysis, design and control of permanent magnet synchronous motors for wide speed operation

... Torque performance of SVM based DTC and Current Control for a wide speed operation 169 6.26 Power performance of SVM based DTC and Current Control for a wide speed operation ... Control of IPMSM in Wide Speed Operation 24 Outline of the Thesis 25 Analysis of Interior Permanent Magnet Synchronous Motors for Wide- Speed Operation ... presents aspects of analysis, design and control of permanent magnet synchronous motors (PMSMs) for wide- speed operations An analytical method has been developed based on d- and q- axis equivalent...

Computational analysis of a permanent magnet synchronous machine using numerical techniques

... is vital to machine analysis as it is a fast and low-cost way of predicting machine performances Traditional analytical methods, such as lumped parameter models are computationally fast and simple ... It also deals with the parameter estimation of permanent magnet synchronous machines using both experimental and computational methods A line-start interior permanent magnet synchronous machine ... Permanent Magnets The properties and performances of a permanent magnet machine are greatly affected by the characteristics of permanent magnets Therefore proper representation of permanent magnet...

Sensorless drives for permanent magnet synchronous motors

... and its ZCP waveforms based on modified algorithm Captured voltage and current waveforms for VDC = 5V Captured voltage and current waveforms for VDC = 8.48V Captured waveforms for VDC = 8.48V ... drive is conventionally applied on BLDC motors, a class of permanent magnet motors with trapezoidal back-EMFs, for smooth torque production In three phase BLDC drives, the motor is typically driven ... proposed for BLDC motors [19], motors with trapezoidal back-EMFs which have been extended to PMSM [22] The back-EMFs for these motors contain a third harmonic component which can be utilized for the...

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FAULT DIAGNOSIS OF PERMANENT MAGNET SYNCHRONOUS MOTOR BASED ON MECHANICAL AND MAGNETIC CHARACTERISTIC ANALYSIS

... FAULT DIAGNOSIS OF PERMANENT MAGNET SYNCHRONOUS MOTOR BASED ON MECHANICAL AND MAGNETIC CHARACTERISTIC ANALYSES YU YINQUAN A THESIS SUBMITTED FOR THE DEGREEM OF DOCTOR OF PHILOSOPHY ... COMPUTATION OF UNBALANCED MAGNETIC PULL AND MECHANICAL UNBALANCED FORCE IN MOTOR 64 5.1 Fundamental theory of electromagnetic force calculation 64 5.2 Introduction of Finite Element Method on Magnetic ... INTRODUCTION and motor fault type and fault position can be indicated precisely Numerous studies have been done on the motor fault analysis using vibration signals Mathematical Model of Permanent Magnet...

Use of an extension of the park's transformation to determine control laws applied to a non sinusoidal permanent magnet synchronous motor

... knowledge of the non sinusoidal permanent magnet synchronous motor We are so able as well to analyse the classical control laws such as 120' voltage control for example, as to deduce of this new ... electromotiveforces, the motor being not supply Park's transformation AAer this first transfoxmation, the Pa& transfomation allows us to work in the rotor's reference, through a rotation of an angle PO.Using the ... PROPOSAL OF AN EXTENSION OF THE PARK'S TRANSFORMATION Classical Park's transformation is in fact the succession of two transfomations The torque is then given by: T, = p.(@~,.io+@'did+@'q.iq) For a...

Analysis and determination of cogging torque and unbalanced magnetic forces in permanent magnet spindle motors for hard disk drives

... the electromagnetic forces are extremely stringent Electromagnetic forces such as the cogging torque and unbalanced magnetic pull (UMP) generated in the permanent magnet spindles are of great concerns ... Modeling and Analysis of PM Brushless DC Motors 2.1 Electromagnetic Field in PM Brushless DC Motors In order to study the electromagnetic forces and torques in permanent magnet spindle motors, ... magnet motors used in hard disk drives 2) To build a model for predicting the electromagnetic forces developed in PM motors with sufficient accuracy required for design and analysis of PM spindle...

Numerical analysis of a brushless permanent magnet DC motor using coupled systems

... to characterize the material Another type of material that is characterized by a broad hysteresis loop is called hard magnetic material 1.3.1 Hard magnetic materials (Permanent magnets) Permanent ... commutator motor: The construction of a permanent magnet DC motor( PMDC) is similar to a DC conventional motor with the electromagnetic excitation system replaced by permanent magnets A PMDC commutator ... have made using BLDC motor a viable alternative The developments and applications of the BLDC motors have been greatly accelerated by improvements in permanent magnet materials, especially rare-earth...

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CFD for hydrodynamic efficiency and design optimization of key elements of SHP

... utility of the CFD numerical simulations as a tool for design and optimization of hydropower performance and flow behavior through hydromechanical devices or hydraulic structures of intake and outlet ... out of the best efficiency point (BEP) Figure Change of the runner speed and the frequency of vortex at the draft tube of a Francis turbine One of the most important concerns on turbine runner and ... Portugal) and has few publications She is researcher under the scientific domain of water and energy, CFD for SHP and participates in the FCT Project - PTDC/ECM/68694/2006 – Vulnerability and behaviour...

Strategy for the instantaneous torque control of permanent magnet brushless DC drives2

... the DSP controller together with the inner loop controller Both the sinusoidal current control and the instantaneous torque control are tested with the speed controller The time response of the ... simulated torque from the motor model is used as the feedback torque signal, i.e the feedback is ideal Therefore, the simulated performance of the controller depends solely on the control algorithm ... eliminate torque pulsation by direct digital control of the inverters This paper describes the instantaneous torque control of a BLDC drive, with the objectives of minimisation of torque ripples...

Báo cáo khoa học: "Optimization of in situ hybridization assay using nonradioactive DNA probes for the detection of canine erpesvirus (CHV) in paraffin-embedded sections" pdf

... Okjin Kim Table Comparison of different protocols for the detection of canine herpesvirus DNAs in paraffin sections by in situ hybridization Labelsb Protease Kc Hybridizationd 100 Titer of inoculated ... enzyme-concentrations, the time of hybridization and hybridization probes, were compared in formalin fixed and paraffin embedded CHV-infected cells The optimum result was obtained using digoxigenin-labeled ... proteinase K pre-treatment, and overnight hybridization The practicality of digoxigenin-labeled probe is better than those of biotin-labeled probe in the hybridization assay for the detection of...

Design optimization of small scale unmanned air vehicles

... DESIGN OPTIMIZATION OF SMALL- SCALE UNMANNED AIR VEHICLES NG TZE HUI THOMAS (B.Eng (Hons.), NUS) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN ENGINEERING DEPARTMENT OF MECHANICAL ... this thesis, new design methodologies have been developed for the design of small- scale unmanned air vehicle (UAV) and micro air vehicle (MAV) It is well known that the design of aircraft involves ... science of aviation As the boundaries of technology are pushed further with the launch of the biggest jet airliner A380 by Airbus, the conventional airplane is also shrinking with the advent of small- scale...

báo cáo hóa học: " A comparison of EQ-5D index scores using the UK, US, and Japan preference weights in a Thai sample with type 2 diabetes" pdf

... instead of 42 health states The plain main effects model was preferred [11] Data analysis The EQ-5D index scores were calculated using the UK, US, and Japan preference weights We first determined the ... derived from the UK, US, and Japan preference weights Distribution Distribution of EQ-5D scores derived from the UK, US, and Japan preference weights The Bland-Altman plot of UK and Japan weights ... Tsuchiya A, Williams A, Yfantopoulos J, De Charro F: A comparison of EQ-5D time trade-off values obtained in Germany, United Kingdom, Spain In The measurement and valuation of health status using EQ-5D: ...

Báo cáo hóa học: " Robust Transmission of H.264/AVC Streams Using Adaptive Group Slicing and Unequal Error Protection" pptx

... ordering (FMO) Using FMO, groups of macroblocks, known as slice groups, are formed Slice groups consist of one or more slices; this enables better error localization The structure of a slice group is ... slice groups (b) Figure 6: Allowable packet exchanges in case of three slice groups where Kl and Nl are the number of source and RS packets of the lth slice group Pl (i) is the packet error probability ... with unequal error protection (UEP) schemes 3.1 Problem formulation Using the FMO, it is possible to form slice groups of unequal importance In our approach, the unequally-important slice groups...

Báo cáo khoa học: "Localization of antigenic sites at the amino-terminus of rinderpest virus N protein using deleted N mutants and monoclonal antibody" doc

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