Guidelines for Designing Concentrated Winding Fractional Slot Permanent Magnet Machines

Jussila, H.; Salminen, P.; Niemelä, Markku; Pyrhönen, Juha

doi:10.1109/powereng.2007.4380186

Cited by 39 publications

(18 citation statements)

References 4 publications

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“…The model was able to calculate both radial and tangential components of the airgap magnetic field for the slotted PMBLAC. For the internal rotor slotted PMBLAC, the magnetic fields at mid-airgap for radial and tangential components are shown above as (5) and (6) respectively [23,24].…”

Section: Analytical Sub-domain Modellingmentioning

confidence: 99%

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Optimization of surface-mounted permanent magnet brushless AC motor using analytical model and differential evolution algorithm

Mohamed

Ishak

2019

Journal of Electrical Engineering

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This paper discusses the optimization of surface-mounted permanent magnet brushless AC (PMBLAC) motor using Analytical Sub-domain model with Differential Evolution Algorithm (ASDEA). Only two regions were considered in this analytical sub-domain model, ie magnet and airgap regions, with assistance of Complex Relative Permeance Function (CRPF) to account for the stator slotting effect. Five machine parameters were chosen to be optimized, namely the magnet arc-pole-pitch ratio, slot opening width, magnet thickness, airgap length and stator inner radius. The optimization process has four objectives, ie minimum torque ripple, low cogging torque, high efficiency, and high output torque. The results from the optimized ASDEA were compared with the Analytical Sub-domain Genetic Algorithm (ASGA) and further validated against 2-D finite element model (FEM). Results show a good agreement between analytically optimized models and finite element model. The ASDEA has faster computational time compared to ASGA, and this provides benefit in terms of reducing the machine design parameterization time and less redundancy work required to achieve motor design specifications.

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Section: Analytical Sub-domain Modellingmentioning

confidence: 99%

“…Surface-mounted internal rotor type is often preferred due to smallest leakage flux. PMBLAC with concentrated winding type has better efficiency and lower cost due to less copper and magnetic volume used [3][4][5]. The magnetization vectors in the rotor magnets can either be radial, parallel, or Halbach patterns.…”

Section: Introductionmentioning

confidence: 99%

Optimization of surface-mounted permanent magnet brushless AC motor using analytical model and differential evolution algorithm

Mohamed

Ishak

2019

Journal of Electrical Engineering

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“…At the initial design stage of FSCW PMSMs, one of the key issues is to make a rapid performance comparison to select the most promising slot/pole combinations since it significantly affects the machine's performance [4]. In [5]- [8], the winding factors for FSCW PMSMs with several slot/pole combinations, as well as the influence of slot/pole combination on cogging torque, are clearly given. In [9] and [10], it is found that the slot/pole combination has an impact on the mutual and air-gap leakage inductances, which are related to the fault tolerant [11] and flux weakening Manuscript received July 18, 2018; revised October 21, 2018; accepted November 20, 2018. The authors are with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, UK.…”

Section: Introductionmentioning

confidence: 99%

“…In [13] and [14], the influence of the number of slot per pole per phase (q) and number of phases on the rotor losses are investigated. The unbalanced magnetic force in FSCW PMSMs is investigated and some suggestions are made on the choice of the slot/pole number [8] [15]. The influence of the slot/pole combination on the radial force and vibration mode was shown in [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Gear Ratio on the Performance of Fractional Slot Concentrated Winding Permanent Magnet Machines

Liu

Zhu

2019

IEEE Trans. Ind. Electron.

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Fractional slot concentrated winding (FSCW) permanent magnet synchronous machines (PMSMs) have been a research hotspot over the past few decades. Recently, the magnetic gearing effect in FSCW PMSMs is revealed along with its gear ratio which is a function of slot/pole number combination. At the design stage of FSCW PMSMs, one of the key issues is the selection of the slot/pole number combination. This paper shows that the gear ratio can contribute to a proper slot/pole number selection in any multi-phase FSCW PMSMs by acting as a unified index for a quick overall performance comparison. In the paper, firstly, the magnetic gearing effect in FSCW PMSMs is explained and the gear ratio is further discussed. The advantages of adopting gear ratio as the overall performance index over other indices are revealed. The influence of the gear ratio on the winding factor, torque output, cogging torque, inductance and rotor losses of 3-and 6-phase FSCW PMSMs are analyzed and validated by experiments, thus proving the analyses. Index Terms-concentrated winding, fractional slot, gear ratio, inductance, losses, magnetic gearing effect, permanent magnet machines, winding factor. Yue Liu (S'16) received the B.Eng. and M.Sc. degrees in electrical and electronic engineering from Harbin Institute of Technology, Harbin, China, in 2013 and 2015, respectively. He is currently working toward the Ph.D. degree in the

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“…Such machines have relatively large self-inductance and small mutual inductance assuring that the faulty winding will not affect the healthy ones. Furthermore, a close slot/pole combination of the fractional-slot concentrated winding machine, i.e., 2p (pole number) = Q (slot number) ± 2, should be utilized in order to maximize the flux linkage and torque density [16,17]. Hence, a high winding factor of more than 0.9 and negligible cogging torque can also be obtained.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Novel 24-Slot/14-Pole Six-Phase Fault-Tolerant Modular Permanent-Magnet In-Wheel Motor for Electric Vehicles

Zheng

Lei

et al. 2013

Energies

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Abstract:In this paper, a six-phase fault-tolerant modular permanent magnet synchronous machine (PMSM) with a novel 24-slot/14-pole combination is proposed as a high-performance actuator for wheel-driving electric vehicle (EV) applications. Feasible slot/pole combinations of the fractional-slot concentrated winding six-phase PMSM are elicited and analyzed for scheme selection. The novel 24-slot/14-pole combination is derived from the analysis and suppression of the magnetomotive force (MMF) harmonics. By making use of alternate-teeth-wound concentrated winding configuration, two adjacent coils per phase and unequal teeth widths, the phase windings of the proposed machine is magnetically, thermally isolated, which offers potentials of modular design and fault tolerant capability. Taking advantage of the leakage component of winding inductance, 1.0 per unit short-circuit current is achieved endowing the machine with short-circuit proof capability. Optimal design of essential parameters aiming at low eddy current losses, high winding factor and short-circuit-proof ability are presented to pave the way for a high-quality system implementation.

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Guidelines for Designing Concentrated Winding Fractional Slot Permanent Magnet Machines

Cited by 39 publications

References 4 publications

Optimization of surface-mounted permanent magnet brushless AC motor using analytical model and differential evolution algorithm

Optimization of surface-mounted permanent magnet brushless AC motor using analytical model and differential evolution algorithm

Influence of Gear Ratio on the Performance of Fractional Slot Concentrated Winding Permanent Magnet Machines

Investigation of a Novel 24-Slot/14-Pole Six-Phase Fault-Tolerant Modular Permanent-Magnet In-Wheel Motor for Electric Vehicles

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