Synchronous reluctance machines with internal rotor flux barriers-efficient performance improvement by means of internal permanent magnets

2002 ◽  
Author(s):  
E. Schmidt
Keyword(s):  
Performance Improvement ◽  
Permanent Magnets ◽  
Efficient Performance ◽  
Rotor Flux ◽  
Internal Rotor

Novel switched flux machine with radial and circumferential permanent magnets

2016 ◽  
Vol 35 (2) ◽  
pp. 473-492 ◽  
Author(s):  
M.M.J. Al-ani ◽  
Z.Q. Zhu
Keyword(s):  
Permanent Magnets ◽  
Outer Region ◽  
Optimization Procedure ◽  
Design Parameters ◽  
Element Analysis ◽  
Content Type ◽  
Copper Loss ◽  
Rotor Pole ◽  
Internal Rotor ◽  
External Rotor

Purpose – The paper purposes a novel SFPM machine topology with radial and circumferential permanent magnets (PMs). The paper aims to discuss this issue. Design/methodology/approach – In order to reduce the flux leakage in the stator-outer region and consequently achieve higher magnetic material utilization in switched flux permanent magnet (SFPM) machine, a novel topology with radial and circumferential PMs is proposed. This topology (SFRCPM) has the same structure as conventional SFPM (CSFPM) machine except of the additional set of radially magnetized PMs located around the back iron and surrounded by a laminated ring frame. Using finite element analysis (FEA) the influence of the design parameters on the performance is investigated in order to obtain an effective optimization procedure. Internal and external rotor SFRCPM machines with either NdFeB or ferrite magnets are investigated, optimized and compared with the CSFPM machine having the same size, copper loss and stator/rotor pole combination. Findings – It is concluded that comparing SFRCPM with its CSFPM machine counterpart, internal rotor SFRCPM machine can achieve high PM flux-linkage per magnet volume, however reduced slot area leads to low output torque, whereas external rotor SFRCPM machine can produce higher torque and torque per magnet volume. Originality/value – This paper proposes a novel SFPM machine topology.

scholarly journals A Novel Signal Scrambling Technique for PAPR Reduction in OFDM Systems

2019 ◽  
Vol 8 (9S) ◽  
pp. 767-770
Keyword(s):  
Performance Improvement ◽  
Average Power ◽  
Signal Amplitude ◽  
Ofdm Systems ◽  
Linear Region ◽  
Ofdm Signal ◽  
Efficient Performance ◽  
Data Rates ◽  
Modulation Type ◽  
Simulation Results

OFDM forms the basis of the upcoming next generation technologies so as to achieve higher data rates within a given bandwidth effectively. One of the major issues associated with OFDM is Peak to Average Power Ratio (PAPR) which needs to be minimized to get an efficient performance. The random variation in the signal amplitude of the OFDM signal leads to additional interference in the system and hence affecting the performance of HPA in non-linear region. In this paper, we propose a technique for the reduction of PAPR in OFDM systems with some increased complexity which works for any modulation type and any number of subcarriers. The simulation results show performance improvement with respect to the existing signal scrambling techniques

Performance improvement in a sensorless surface-mounted PMSM drive based on rotor flux observer

2020 ◽  
Vol 96 ◽  
pp. 104276
Author(s):  
Mario Marchesoni ◽  
Massimiliano Passalacqua ◽  
Luis Vaccaro ◽  
Marco Calvini ◽  
Marco Venturini
Keyword(s):  
Performance Improvement ◽  
Flux Observer ◽  
Rotor Flux

Intellectual capital based performance improvement, study in insurance firms

2015 ◽  
Vol 16 (3) ◽  
pp. 619-638 ◽  
Author(s):  
Amir Zakery ◽  
Abbas Afrazeh
Keyword(s):  
Performance Improvement ◽  
Intellectual Capital ◽  
Two Phase ◽  
Content Type ◽  
Insurance Sector ◽  
Intangible Resources ◽  
Knowledge Based ◽  
Efficient Performance ◽  
Insurance Firms ◽  
Using Data

Purpose – Intangible resources are the most distinctive firms’ assets in competitive environments especially in service businesses. Insurance firms seeking more efficient performance than competitors should improve their intellectual capital (IC) strategies in both aspects of IC creation and utilization. The purpose of this paper is to investigate and improves IC participation in insurance firms’ efficiency. Design/methodology/approach – A two-phase framework: “explaining IC role in efficiency” and “measuring efficiencies of IC creation and application” is developed in order to find IC strategies increasing firms’ efficiency and though competitiveness. Efficiency is measured using data envelopment analysis and the generalized estimating equations is used as the regression method in order to explain efficiency with IC measures. Findings – Empirical results in Iran insurance sector (during a seven-year period for 17 Iranian insurers) show some IC components influence firms’ efficiency and could be intervention points for performance improvement. Then the firms are categorized into four zones in terms of IC efficiency and strategies are recognized for each category. Research limitations/implications – Although the research is initiated by the need to embed intangible resources in performance improvement in insurance sector, the research framework could be strongly applied in other knowledge-based industries. Originality/value – This paper embeds an innovative link between classic efficiency and IC which aligns resource management with competitiveness strategies.

Low Speed Performance Improvement in a Self-Commissioned Sensorless PMSM Drive Based on Rotor Flux Observer

2019 ◽  
Author(s):  
Mario Marchesoni ◽  
Massimiliano Passalacqua ◽  
Luis Vaccaro ◽  
Marco Calvini ◽  
Marco Venturini
Keyword(s):  
Performance Improvement ◽  
Low Speed ◽  
Flux Observer ◽  
Speed Performance ◽  
Rotor Flux

Investigation of stator slots and rotor flux barriers number impact on the performances of a six phases synchronous reluctance motor assisted by permanent magnets

2021 ◽  
Author(s):  
Abdelli Abdenour ◽  
Chareyron Baptitste ◽  
Gilson Adrien ◽  
Cisse Koua Malick ◽  
Nasr Andre
Keyword(s):  
Permanent Magnets ◽  
Synchronous Reluctance Motor ◽  
Reluctance Motor ◽  
Rotor Flux
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