Modeling and Simulation of a Novel Low-Speed High-Torque Permanent Magnet Synchronous Motor with Asymmetric Stator Slots

Kou, Shaokai; Kou, Ziming; Wu, Juan; Wang, Yandong

doi:10.3390/machines10121143

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…In [16] and [21] it is suggested that modifying the tooth tips can improve the magnetic flux distribution and reduce saturation, improving the PMSM performance without affecting the manufacturability of the machine, e.g., the slot opening size remaining the same as in the symmetric geometry. The goal is to evaluate the impact of asymmetry on the PMSM performance, providing insights into optimizing PMSMs with tooth-coil windings for a high frequency and a high specific power.…”

Section: B Stator Tooth Geometrymentioning

confidence: 99%

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Impact of Stator Core Magnetic Asymmetry on the Properties of a High Specific Power PMSM

Canseven,

Petrov,

Pyrhönen

2024

IEEE Trans. on Ind. Applicat.

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Permanent MagnetSynchronous Machines (PMSMs) are commonly employed in applications demanding a high specific power. To achieve high specific power values, a high pole pair number PMSM with very thin yokes can be built. Such a design leads to a high operating frequency. At high operating frequencies, AC losses can more than double the DC losses if solid hairpin technology or traditional bunches of nontransposed round enameled wires are used in the stator windings of machines with a considerable power. Against this negative effect, the emerging Litz wire coil technology with prefabricated coils can be used. In this study, firstly, alternative stator slot geometries required when using prefabricated Litz wire coils are evaluated. A symmetric semi-closed slot is not suitable for inserting such prefabricated Litz wire coils into the stator slots. Instead, an asymmetric semi-closed slot can be used, and it may even offer a better performance than the symmetric open slot. After showing that the asymmetric semi-closed slot provides a better performance, it is investigated how this asymmetric stator slot geometry can be used beneficially. The findings were first studied with finite element analysis (FEA) and then experimentally verified on a high-specific-power machine.

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Section: B Stator Tooth Geometrymentioning

confidence: 99%

“…Symmetric and asymmetric stator slots are compared in [21] to investigate the electromagnetic performance of a PMSM. According to the results, properly designed asymmetric stator teeth result in a higher fundamental flux density in the air gap, and therefore, a higher average torque.…”

Section: Introductionmentioning

confidence: 99%

Impact of Stator Core Magnetic Asymmetry on the Properties of a High Specific Power PMSM

Canseven,

Petrov,

Pyrhönen

2024

IEEE Trans. on Ind. Applicat.

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“…The slot opening and the slot body for installing magnetic slot wedges comprise the asymmetric structure. As shown in Figure 4c, to facilitate modeling, the irregular region in the slot is simplified as the sector annular area and we define the asymmetry of the slot opening λ and the asymmetry of the inside slot ξ, which can be expressed as in [7].…”

Section: Modeling and Analysis Of Magnetic Fieldsmentioning

confidence: 99%

“…An Integrated LHPMSM for a mine hoist was proposed in [7]. The mechanical transmission structure of the motor does not adopt a reducer and coupling.…”

Section: Introductionmentioning

confidence: 99%

Novel Magnetic Field Modeling Method for a Low-Speed, High-Torque External-Rotor Permanent-Magnet Synchronous Motor

Kou,

et al. 2023

Electronics

Self Cite

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In view of the unstable electromagnetic performance of the air gap magnetic field caused by the torque ripple and harmonic interference of a multi-slot and multi-pole low-speed, high-torque permanent magnet synchronous motor, we propose a simplified model of double-layer permanent magnets. The model is divided into an upper and a lower subdomain, with the upper subdomain being an ideal circular ring and the lower subdomain being a segmented sector ring. Moreover, we develop an exact analytical model of the motor that predicts the magnetic field distribution based on Laplace’s and Poisson’s equations, which is solved using the method of separating variables. Taking a 40p168s low-speed, high-torque permanent magnet synchronous motor as an example, the accuracy of the model is verified by comparison with an ideal circular ring model, a segmented sector ring model, and the finite element method. Based on the proposed simplified model, three combined permanent magnets considering both edge-cutting and polar arc cutting structures are proposed, which are chamfered, rounded, and rectangular combinations. Under the premise of a consistent edge-cutting amount, the electromagnetic characteristics of the three combination types of permanent magnets are compared using the finite element method. The results show that the electromagnetic characteristics of the chamfered combination PM are superior to those of the other two combinations. Finally, a prototype is manufactured and tested to validate the theoretical analysis.

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“…This consisted of computing the initial geometry and winding of the PMSM by using simple analytical equations and some general rules [59][60][61]. During this design stage, the iron core and permanent magnet volumes, the number of slots, the main sizes of the stator and rotor, the winding diagram and the number of turns, the materials to be used, etc., were estimated by the well-known relationships among the main machine sizes and other parameters [62][63][64][65].…”

Section: Pre-sizing the Pmsmmentioning

confidence: 99%

On the Usefulness of Employing ANSYS Motor-CAD Software in Designing Permanent Magnet Synchronous Machines

Coteț

Vascan

Szabó

2023

Designs

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This paper deals with the simulation of a permanent magnet synchronous machine (PMSM) to be developed for driving a scroll compressor of a vehicle air conditioning system. The simulations were needed for the verification of the pre-sizing and for the electromagnetic behavior analysis of the PMSM. These were performed by using the ANSYS Motor-CAD software. All the obtained results emphasized that the pre-sizing of the PMSM was performed correctly, and the designed electrical machine can fulfill all the prescribed requirements. To highlight the superiority of the chosen surface-mounted PMSM topology, a comparative study was performed for four PMSMs having the same stator but different rotor topologies having the same quantity of permanent magnets. The study revealed that the PMSM with permanent magnets on its rotor surface is the best-fitting variant for the foreseen application. By intensively using the ANSYS Motor-CAD software, the authors appreciated that this product is a very useful tool in the hands of the designers not only in evaluating the machine’s computed geometry (by checking its correctness and feasibility), but also in its in-depth electromagnetic analysis and in calculating its parameters of interest.

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Modeling and Simulation of a Novel Low-Speed High-Torque Permanent Magnet Synchronous Motor with Asymmetric Stator Slots

Cited by 5 publications

References 24 publications

Impact of Stator Core Magnetic Asymmetry on the Properties of a High Specific Power PMSM

Impact of Stator Core Magnetic Asymmetry on the Properties of a High Specific Power PMSM

Novel Magnetic Field Modeling Method for a Low-Speed, High-Torque External-Rotor Permanent-Magnet Synchronous Motor

On the Usefulness of Employing ANSYS Motor-CAD Software in Designing Permanent Magnet Synchronous Machines

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