Characteristic Analysis on Overhang Effect in Axial Flux PM Synchronous Motors with Slotted Winding

Jo, Won-Young; Cho, Yun‐Hyun; Chun, Yon‐Do; Koo, Dae‐Hyun

doi:10.1109/ipemc.2006.4778307

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Generally, permanent magnet motors have an overhang structure in which the length of PM is longer than the length of the stator's stack. The overhang structure is commonly installed in PM machines to increase the air-gap flux density by concentrating magnetic flux [25]. The optimization of rotor overhang variation and PM overhang within the tangential direction is proposed to enhance the performance of AFPM machines.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

et al. 2021

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In this paper, a hexagonal magnet shape is proposed to have an arc profile capable of reducing torque ripples resulting from cogging torque in a single-sided axial flux permanent magnet (AFPM) machine. The arc-shaped permanent magnet increases the air-gap length effectively and makes the flux of the air-gap more sinusoidal, which decreases air-gap flux density and hence causes a reduction in cogging torque. Cogging torque is the basic source of vibration, along with the noise in PM machines, since it is the main cause of torque ripples. Cogging torque is independent of the load current and is proportional to the air-gap flux and the reluctance variation. Three-dimensional finite element analysis (FEA) is used in the JMAG-Designer to analyze the performance of the conventional and proposed hexagonal-shaped PM AFPM machines. The proposed shape is designed to reduce cogging torque, and the voltage remains the same as compared to the conventional hexagonal-shaped PM machine. Further, optimization is performed by utilizing an asymmetric overhang. Latin hypercube sampling (LHS) is used to create samples, the kriging method is applied to approximate the model, and a genetic algorithm is applied to obtain the optimum parameters of the machine.

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Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

et al. 2021

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Characteristics investigation of a new type AFPM machine according to the geometric structure of rotor using 3D FEM

Lee

Kim

Cho

et al. 2008

COMPEL

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Purpose -The purpose of this paper is to present the performance characteristics analysis of a new type axial flux permanent magnet (AFPM) machine according to the geometric structure of rotor such as permanent magnet dimension, the air-gap length and so on. Design/methodology/approach -The 3D finite element method (FEM) is used to analyse electromagnetic fields with the aid of an ANSYS software package. The FEM is based on the magnetic vector potential and the governing equation can be obtained from the Maxwell equation. Using the dynamometer system, the characteristics of the AFPM machine were estimated according to load torque. Findings -The AFPM machine characteristics with static torque, cogging torque and flux density according to rotor geometric dimensions are analyzed using a 3D FEM software package. And then, the prototype of an AFPM machine and several rotors with different PM structure are manufactured and tested. Resulting from the experiment, the characteristics such as EMF waveform, speed and efficiency curves according to load torque, and efficiency curves according to PM thickness, are obtained. The measured performance results verified the overhang effects and improved the efficiency of the motor. Originality/value -The paper proposes a new type AFPM machine structure with T-shape teeth and laminated back yoke and two types of rotor with fan-shaped permanent magnets. It presents the results of characteristics of the proposed AFPM machine throughout the simulation and experiment.

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Topology Comparison of Compound-Structure Permanent-Magnet Synchronous Machines

Liu

Cheng

Bai

et al. 2012

IEEE Trans. on Ind. Applicat.

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Characteristic Analysis on Overhang Effect in Axial Flux PM Synchronous Motors with Slotted Winding

Cited by 3 publications

References 5 publications

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction

Characteristics investigation of a new type AFPM machine according to the geometric structure of rotor using 3D FEM

Topology Comparison of Compound-Structure Permanent-Magnet Synchronous Machines

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