A Dual- Stator Machine with Diametrically Magnetized PM: Analytical Air-gap Flux Calculation, Efficiency Optimization and Comparison with Conventional Dual-Stator Machines

Asgari, Shahin; Yazdanpanah, Reza; Mirsalim, Mojtaba

doi:10.24200/sci.2019.53316.3181

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…The Winding Function (WF) method is used to calculate the synchronous and induction machines inductances, while the air-gap length could be fixed or variable in this calculations [23,24].…”

Section:  mentioning

confidence: 99%

Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications

2021

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Induction motors have been traditionally used in industrial applications ranging from a fraction of horse-power up to several Megawatts due to their substantial benefits. Induction drives with more than three-phases are superior to the 3-phase induction drives in terms of overall-volume, torque fluctuations, current passing each stator-winding, ohmic-loss, efficiency and reliability in the case of stator-windings open-circuit fault. These benefits are especially more attractive in variable speed drivers due to the reduced capacity of power-electronics switches. This paper aims to develop an optimal electromagnetic-thermal design procedure of a high-power sevenphase induction motor suitable for variable-speed applications. In this multi-objective design approach, the objective function is defined aiming to increase the efficiency, power-factor, power-to-weight ratio, starting-torque as well as decrease the starting-current. Furthermore, the electrical, mechanical, dimensional, magnetic and thermal limitations are included in this optimization study in order to ensure practical realization of the designed machine. The coupled-circuit method is employed for nonlinear electromagnetic modeling while the current displacement phenomenon is considered in rotor parameters calculations. A lumped-parameter-thermal model is established for calculating heat rises of different parts in each iteration of optimization study. Finally, the performance characteristics of the optimally designed 1-MW 4-pole motor are verified using 2D-FE analyses.

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“…The Winding Function (WF) method is used to calculate the synchronous and induction machines inductances, while the air-gap length could be fixed or variable in this calculations [23,24].…”

Section:  mentioning

confidence: 99%

Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications

2021

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“…This equation can be used for both stators by substituting their dimensions in ( 14), ( 15), (18), and (19).…”

Section: Tlf Modeling In Pmc Structurementioning

confidence: 99%

“…The analytical models of the TLF were explained in the previous sections and comparison results between SMC and PMC structure were utilized to design a new PM machine based on SMC structure: dual-stator radial-flux machine with diametrically magnetized cylindrical permanent magnets [9,19].…”

Section: Comparison and Application In The Pm Machinementioning

confidence: 99%

Analysis and modeling of tooth-tip leakage fluxes in a radial-flux dual-stator machine with diametrically magnetized cylindrical permanent magnets

Saed

Asgari

Mirasalim

2019

Trans. Electr. Mach. Syst.

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Tooth-tip Leakage flux (TLF) has a major effect on the prediction of air-gap flux distribution and electromagnetic torque in the permanent magnet (PM) machines. Therefore, deriving a model for TLF is necessary for machine design and optimization. Accurate modeling of TLF can lead to fast and precise solutions, which ease the analysis of electromagnetic devices. It also provides the opportunity to increase torque density by more efficient utilization of PM's volume and prevent saturation in machine optimization. This paper presents a method for modeling and analyzing TLFs in a radial-flux dual-stator permanent magnet (DSPM) machine with diametrically magnetized cylindrical permanent magnets (DMCPM) in series and parallel magnetic circuit structures. In this model, some expressions in terms of machine dimensions are derived for the TLF analysis. Finite element method (FEM) is applied to validate the proposed model. Results indicate that the maximum error between the proposed model and FEM is insignificant (less than 6%). Finally, by a prototyped machine the validity of the proposed model was investigated with the experimental tests.Index Terms-Dual-stator permanent magnet (DSPM) machine, diametrically magnetized cylindrical permanent magnet (DMCPM), tooth-tip leakage fluxes (TLFs). I. INTRODUCTIONUAL stator permanent magnet (DSPM) machines have recently attracted a lot of attention to wind power generation, electric vehicles, hybrid electric vehicles, and starter generators because of their advantages, such as high efficiency and high torque and power density [1]- [5]. From the structural point of view, DSPM machines are designed to provide more efficient utilization of the rotor's space in conventional PM machines, which increases torque density [1]. DSPM machines are a combination of two conventional single stator PM machines, one with outer rotor structure and the other with inner rotor structure [3]. As shown in Fig. 1, in series magnetic circuit (SMC) structure, stators have magnetic

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“…However, these advantages often come with high-cost penalty, especially, when high-energy density rare-earth magnetic materials are deployed. More so, it is established in Raza et al, (2017) and Asgaria et al, (2022) that improved machine performances could be obtained from double stator electric machines compared to their single stator equivalents. Hence, three different kinds of double stator permanent magnet (DSPM) machines are developed and compared in this study, for improved electromagnetic performances.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of dual stator machines

Awah

2024

Nig. J. Technol. Dev.

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Electromagnetic performance of three different types of double stator permanent magnet machine is analyzed and compared in this study. The analyzed machines in this study are Machine 1, Machine 2 and Machine 3. These machines are designated as: M 1, M 2 and M 3, respectively. The studies are implemented using two-dimensional and three-dimensional finite element analysis (2D-FEA and 3D-FEA) methods. The predicted performance indices are: total harmonic distortion of the voltage, torque ripple, cogging torque, winding inductances, output torque and unbalanced magnetic force (UMF). The studies show that the investigated machine types have negligible reluctance torque and thus, similar axes inductance values. Therefore, the machines’ bulk torque components are contributed mainly by the magnets while the armature excitation sources yield lesser torque components. Amongst the compared machines, M 3 type has an outstanding performance in almost all the performance metrics, compared to M 2 and M 1 types. Nevertheless, M 1 machine type has some good attributes, particularly, with respect to its high output torque per applied magnet volume, in addition to its widest operating speed range ability. Low-speed high-torque applications are most suitable for the investigated machines in practice.

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A Dual- Stator Machine with Diametrically Magnetized PM: Analytical Air-gap Flux Calculation, Efficiency Optimization and Comparison with Conventional Dual-Stator Machines

Cited by 5 publications

References 24 publications

Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications

Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications

Analysis and modeling of tooth-tip leakage fluxes in a radial-flux dual-stator machine with diametrically magnetized cylindrical permanent magnets

Comparative analysis of dual stator machines

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