Permanent magnet motors for power density and energy savings in industrial applications

Melfi, M.J.; Evon, S.; McElveen, Robbie

doi:10.1109/papcon.2008.4585822

Cited by 17 publications

(5 citation statements)

References 2 publications

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“…[ [44][45][46] SCIMs are seen as having undergone little change from their development to the present day, especially when compared to the obvious advances in electronics, communication, and information technologies. Hence, this research sought answers to the following questions:…”

Section: Advantages Referencesmentioning

confidence: 99%

A Performance Evaluation of Three-Phase Induction Electric Motors between 1945 and 2020

et al. 2022

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In the late 19th century, the three-phase induction motor was the central element of productivity increase in the second industrial revolution in Europe and the United States. Currently, it is the main load on electrical systems in global terms, reaching approximately 70% of electrical energy consumption in the industrial sector worldwide. During the 20th century, electric motors underwent intense technological innovations that enabled significant performance gains. Thus, this work analyses the performance changes in squirrel-cage rotor three-phase induction electric motors (SCIMs) with mechanical powers of 3.7 kW, 37 kW, and 150 kW and speed ranges corresponding to two poles and eight poles, connected to a low voltage at a frequency of 60 Hz and tested between 1945 and 2020. The study confirms accumulated performance gains of above 10% in some cases. Insulating materials for electrical conductors have gone through several generations (cotton, silk, and currently, varnish). Improvements to the housing for cooling, the bearings, the quality of active materials, and the design were the elements that enabled the high gains in performance. The first commercial two-pole SCIM with a shaft power of 4.4 kW was marketed in 1891, with a weight/power ratio of 86 kg/kW, and until the 2000s, this value gradually decreased, eventually reaching 4.8 kg/kW. Between 2000 and 2020, this ratio showed a reversed trend based on improvements in the performance of SCIMs. More active materials were used, causing the weight/power ratio to reach 8.6 kg/kW. The MEPS (minimum energy performance standards) of SCIMs had an essential role in the performance gain over the last three decades. Data collection was via tests at the Electrical Machines Laboratory of the Institute of Energy and Environment of the University of São Paulo. The laboratory has a history of tests on electrical equipment dating from 1911.

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Section: Advantages Referencesmentioning

confidence: 99%

A Performance Evaluation of Three-Phase Induction Electric Motors between 1945 and 2020

et al. 2022

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“…Electrical machine joule losses can be achieved by considering the dq-axes currents that are used also in the control structure. Losses evaluated at the next time step have the expression reported as follows 2 2 , [ 1] , [ 1] 3 () 2…”

Section: • Electrical Machine Joule Lossesmentioning

confidence: 99%

“…Permanent magnet (PM) machines are generally employed for servo and traction applications [1]. In variable speed drives, they are a viable solution in applications that demand high power density, such as integrated starter generators in aerospace sector [2].…”

Section: Introductionmentioning

confidence: 99%

PWM-Based Optimal Model Predictive Control for Variable Speed Generating Units

Bigarelli

Benedetto

Lidozzi

et al. 2020

IEEE Trans. on Ind. Applicat.

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This paper investigates the DC-link voltage control of an active rectifier that is supplied by a variable speed permanent magnet synchronous generator. This configuration is commonly encountered in gearless wind energy conversion systems as well as in variable speed generating units. The proposed control strategy uses an optimal voltage vector based modulated model predictive control to achieve direct power control. The studied scheme combines the advantages of finite control set Model Predictive Control (MPC) and control techniques that use pulse width modulator. The fast dynamics of the former are obtained during large transients and constant switching frequency operation, of the latter, is ensured in steady state. At each sampling instant, all switching states are evaluated and the two adjacent states that give minimum error in the controlled variables are selected. The duty-cycle of each of these vectors is computed through linear combination and appropriately limited for over-modulation. Simulations and Co-simulation results presented in the paper show interesting results. The control strategy has been developed on an FPGA control platform and experimental results at steady state are shown, with the aim to demonstrate the computational feasibility of the control strategy.

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“…high torque/volume ratio, high power factor, and high efficiency [1], [2]. Depending on the type of winding, PMSMs exhibit different characteristics.…”

Section: Permanent Magnet Synchronous Machines Provide Certain Advantages Over Other Traditional Machines Because Of Theirmentioning

confidence: 99%

Analysis of a Tooth-Coil Winding Permanent-Magnet Synchronous Machine With an Unequal Teeth Width

et al. 2020

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This paper presents an analysis of a permanent magnet synchronous machine (PMSM) with an unequal teeth width. The use of the concentrated nonoverlapping winding, also known as tooth-coil winding, has certain advantages. In addition, asymmetric features can be exploited by adopting this winding configuration to improve the machine performance. The procedure involves increasing the stator tooth width and, to the same extent, reducing the adjacent stator tooth width. In this paper, an analytical method was employed to predict and understand the back-EMF behavior, and a finite element analysis (FEA) was performed to verify the analytical method. Furthermore, a detailed study of the machine performance (electromagnetic torque, flux density, and losses) was carried out by the FEA. The machine was built and tested to validate the performance of the machine. INDEX TERMSAnalytical analysis, asymmetrical stator, finite element analysis, permanent magnet, permanent magnet machine, tooth-coil winding. NOMENCLATURE α Mechanical position. β Electrical position. Mechanical angular speed. 2p Number of poles. Q s Number of slots. v, v 1 , v 2 -th harmonic number. q Number of slots per pole and phase. CT Goodness factor (related to cogging torque). GCD Greatest common divisor. LCM Least common multiple.

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Permanent magnet motors for power density and energy savings in industrial applications

Cited by 17 publications

References 2 publications

A Performance Evaluation of Three-Phase Induction Electric Motors between 1945 and 2020

A Performance Evaluation of Three-Phase Induction Electric Motors between 1945 and 2020

PWM-Based Optimal Model Predictive Control for Variable Speed Generating Units

Analysis of a Tooth-Coil Winding Permanent-Magnet Synchronous Machine With an Unequal Teeth Width

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