Design, analysis, and implementation of extra low air-gap single-phase axial-flux induction motors for low-cost applications

Abstract

Summary In this paper, design and prototyping of two‐speed capacitor‐run single‐phase axial‐flux induction motor (AFIM) for direct‐drive applications is presented. The proposed structure has single stator‐single rotor configuration with high magnetic pull between the stator and rotor, which may compel rotor to lock. Although the most efficient method to overcome this problem is using a second rotor or stator in the mirror with the first one, it is not applicable in low‐cost applications. So, in this paper, two new and fast construction techniques are proposed to fabricate an AFIM with extra low air‐gap length and minimum cost. Beside design and optimization process, a thermal equivalent circuit considering radial and lateral heat transfers is proposed. Then different losses and thermal resistances are exactly calculated to estimate the temperature rise of different motor parts and the maximum specific magnetic and electric loadings. Then, motor performance is evaluated using three‐dimensional time‐stepping finite‐element analysis. Finally, a comprehensive fabrication algorithm for AFIMs is presented, and a prototype of the studied motor is fabricated and tested. The experimental results validate the design, optimization, thermal model, and finite element simulations. Copyright © 2016 John Wiley & Sons, Ltd.

Magnet shifting for back EMF improvement and torque ripple reduction of a TORUS‐type nonslotted axial flux permanent magnet machine

“…With respect to (14), for mitigating hth harmonic of the torque waveform, θ shift must be calculated as follows:…”

“…AFPM machine is one of the best candidates for use in many applications such as renewable energy applications, electromechanical traction drives, electric cars, and marine propulsion system. Regarding the number of stator and rotor discs, AFPM machines are classified into three categories: single‐sided structure, double‐sided structure, and multi‐stage structure . The double‐sided type is the most widely used type of AFPM motor .…”

“…Regarding the number of stator and rotor discs, AFPM machines are classified into three categories: single-sided structure, double-sided structure, and multi-stage structure. [9][10][11][12][13][14] The double-sided type is the most widely used type of AFPM motor. 9 Some of the researchers have already investigated the effect of PM shifting on the performance characteristics of AFPM machines.…”

Design and manufacturing of a single-phase induction motor: A decision aid tool approach

“…At the same time and although the design and the use of SPIMs has evolved throughout the decades, there are still some factors related to optimization and efficiency, which have remained critical to engineers. A review in the relevant technical literature shows that there are several research efforts concerning the broad aspect of SPIM performance improvement, eg, previous studies . An approach to this problem through 2‐level optimization is described in Jazdzynski .…”

“…A review in the relevant technical literature shows that there are several research efforts concerning the broad aspect of SPIM performance improvement, eg, previous studies. [4][5][6][7][8][9][10] An approach to this problem through 2-level optimization is described in Jazdzynski. 5 A procedure to design water-cooled submersible SPIM that can be easily applicable has shown in Gundale and Kulkarni, 11 while a variation of stator slot design for improving the overall performance has presented in Wang et al 12 Simulation results for improving the efficiency and torque of SPIMs by investigations on the impact of changing of some parameters on motor design have been also presented in Sobhani et al 13 The analysis of effects of core material on the magnetic flux distribution and the performance of SPIMs has been studied in Singh and Iqbal.…”