Analytical Method for Overhang Effect of Surface-Mounted Permanent-Magnet Motor Using Conformal Mapping

Ko, Young-Yoon; Song, Jun-Young; Seo, Mi Hae; Han, Wonseok; Kim, Yong-Jae

doi:10.1109/tmag.2018.2841017

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The slope can be expressed algebraically in the Cartesian coordinate system by the magnetic field and magnetic flux density shown in Figure 2. In addition, the PC can be expressed as Equation ( 9) [8,13,14].…”

Section: Operating Point Of Pmsg Using Magnetic Energymentioning

confidence: 99%

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Semi-3D Analysis of a Permanent Magnet Synchronous Generator Considering Bolting and Overhang Structure

et al. 2022

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This study deals with the characteristic analysis of a permanent magnet synchronous generator (PMSG) with a bolting and an overhang structure. Bolting is applied to a PMSG to prevent the defects caused by scattering. To compensate the flux reduction caused by the end effect and bolting material, an overhang structure is used for the permanent magnet machine. Therefore, an overhang structure must be considered in the three-dimensional (3D) analysis of a PMSG; however, such an analysis is time-intensive. To reduce the initial analysis time, we performed a semi-3D analysis of a PMSG considering a bolting and an overhang structure. Subsequently, we compared the output results of the characteristic analysis with a 3D finite element method and experimental results under loading.

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Section: Operating Point Of Pmsg Using Magnetic Energymentioning

confidence: 99%

“…A PMSG with a bolting and an overhang structure should be considered as a complex three-dimensional (3D) structure. The 3D finite element method (FEM) is preferred to accurately consider and analyze these structural elements [6,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Semi-3D Analysis of a Permanent Magnet Synchronous Generator Considering Bolting and Overhang Structure

et al. 2022

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“…The convection thermal resistance can be determined by (8), where h conv and A correspondingly denote the convection heat transfer coefficient and the heat exchange area. The convection heat transfer coefficient is determined by the characteristics of the medium, such as the material, the velocity and the temperature of the fluid.…”

Section: Convection Heat Transfermentioning

confidence: 99%

“…In general, a robot joint motor is designed as a surface-mounted permanent magnet (SPM) motor, as this type of motor offers the advantages of simple construction, manufacturing, and control. To enhance the torque density of a permanent magnet (PM) motor, a rotor overhang structure (OS), which is a simple and effective way to increase the flux linkage, is used in various types of PM motors such as SPM motors [5][6][7][8][9], interior PM motors [10], and spoketype PM motors [11,12]. The OS means that the axial length of the rotor is designed to be longer than the stator core in order to utilise the extra space of both sides of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and thermal analyses of surface‐mounted permanent magnet motor with flux‐absorbing structure for enhancing overhang effect

Lee

Kim

Jung

et al. 2020

IET Electric Power Applications

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Robot joint drive motors require high‐torque and power densities due to their limited space. Surface mounted permanent magnet (SPM) motors are appropriate for a robot joint drive due to their advantages of ease of construction, high productivity, and high controllability. To utilise the limited space effectively, a rotor overhang structure (OS) is frequently used in SPM motors due the performance enhancement and simple fabrication. However, the OS effects do not increase linearly but converge when it becomes longer. To deal with problem, a flux‐absorbing structure (FAS), which can effectively improve the performances even in case of a quite long OS by forming an effective flux path between the OS and stator can be used. However, the FAS results in different electromagnetic and thermal characteristics. In particular, there have been few studies on the thermal characteristics of the FAS, which can change motor performance considerably. Hence, a lumped parameter thermal network (LPTN) which can effectively consider the heat sources and heat transfer characteristics influenced by the use of FAS, is proposed. The feasibility of the FAS and the usefulness of the proposed LPTN was verified experimentally. The presented analyses and results here can be utilised in various high‐torque‐density application.

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“…In [8][9][10][11], the magnetic field in surface-mount and interior PMSMs is calculated in the no-load condition and the main emphasis is on the effect of the shape of the PM poles. An analytical model of the healthy and eccentric PMSMs is presented using two types of conformal mappings at no-load condition in [12,13], respectively. Also, using the magnetic equivalent circuit (MEC), non-linear magnetic analysis of a large turbo-generator is presented under the no-load condition [14].…”

Section: Introductionmentioning

confidence: 99%

Incorporating the coupled effects of slot opening, armature reaction and saturation in the model of the airgap flux density distribution of permanent magnet synchronous machines

Babaei,

Feyzi,

Nazari Marashi

2023

IET Electric Power Appl

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A new analytic model for calculating of the air‐gap flux density (AGFD) of surface‐mounted permanent magnet synchronous machines (SMPMSMs) is presented. This proposed model is capable to taking into account the effects of magnetic saturation, armature reaction and stator slots opening. Furthermore, the real form of air‐gap distribution and spatial distribution of flux density of the PM poles are considered. The armature reaction effect is modeled using phasor diagram analysis of the motor as a function of the load torque, the armature current amplitude, power factor and the inverse air gap length. Also, saturation phenomenon predicted using the new non‐linear proposed function in connection with the armature reaction effects and the properties of the lamination material. It is shown that the proposed model capable to predicting acceptably the air gap flux density waveform of the SMPMSMs at lagging and leading power factors and with the load torque variation. The presented analytical approach is verified by the two‐dimensional finite‐element analysis (FEA) results.

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Analytical Method for Overhang Effect of Surface-Mounted Permanent-Magnet Motor Using Conformal Mapping

Cited by 10 publications

References 6 publications

Semi-3D Analysis of a Permanent Magnet Synchronous Generator Considering Bolting and Overhang Structure

Semi-3D Analysis of a Permanent Magnet Synchronous Generator Considering Bolting and Overhang Structure

Electromagnetic and thermal analyses of surface‐mounted permanent magnet motor with flux‐absorbing structure for enhancing overhang effect

Incorporating the coupled effects of slot opening, armature reaction and saturation in the model of the airgap flux density distribution of permanent magnet synchronous machines

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