Investigation of characteristics of a single‐phase axial flux induction motor using three‐dimensional finite element method and
            <i>d</i>
            −
            <i>q</i>
            model

Nasiri‐Gheidari, Zahra; Lesani, Hamid

doi:10.1049/iet-epa.2012.0131

Cited by 17 publications

(12 citation statements)

References 42 publications

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“…The disk-like structure of the stator and rotor causes the magnetic field to be non-uniformly distributed within the volume of the machine and its estimation requires the use of 3-D finite element analysis [13]. Modeling of the entire resolver using a 3-D time stepping finite element method is computationally too difficult because of the large density of meshes required so in order to study the eccentricity error, it is necessary to consider the entire geometry of the resolver.…”

Section: -D Finite Element Analysismentioning

confidence: 99%

Axial Flux Resolver Design Techniques for Minimizing Position Error Due to Static Eccentricities

Nasiri‐Gheidari

Tootoonchian

2015

IEEE Sensors J.

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This paper proposes a design solution for static eccentricity (SE) in axial flux resolvers (AFRs). There are two definitions for static eccentricity in AFRs. The first approach is based on the definition of static eccentricity in conventional radial flux resolvers, wherein the rotor axis does not coincide with the stator bore, but the rotor rotates around its own shaft. In other words, it is different in the angular inclination of the rotor and stator axis. Thus, the air gap of the motor is not uniform. In the second approach, which is more common in axial flux resolvers, when static eccentricity occurs, air gap length remains uniform. Rotor axis remains parallel with the stator axis, although it does not coincide with the stator bore. This means that there is radial misalignment of the rotor and stator axis. In this paper, both definitions are considered, and an innovative design solution is proposed to decrease the effect of both types of static eccentricity in the accuracy of detected position. Threedimensional time stepping finite element analysis (3-D TSFEA) is used to show the success of proposed designs. Finally, both models were evaluated using experimental results.

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Section: -D Finite Element Analysismentioning

confidence: 99%

Axial Flux Resolver Design Techniques for Minimizing Position Error Due to Static Eccentricities

Nasiri‐Gheidari

Tootoonchian

2015

IEEE Sensors J.

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“…where g 0 is the air-gap length in healthy condition, SEF SC is the percentage of static eccentricity factor which is defined in [25] and j is the rotor particular position angle. Since, the air-gap length is not uniform, the value of mutual inductance (X m ), zig-zag leakage inductance (X zz ), skew leakage inductance (X skew ) and belt leakage inductance (X belt ) is not constant and can be calculated as [2]…”

Section: Conventional Presentation Of Static Eccentricitymentioning

confidence: 99%

“…6), and the existing B-H curve is compared with the air-gap line. Therefore the value of saturated linkage flux can be written as [2] c…”

Section: Modellingmentioning

confidence: 99%

“…Nowadays axial flux induction motors (AFIMs) are wildly used in various applications because of their advantages over conventional motors. Some of these special features, are their planar and adjustable air gap, better power to weight and diameter to length ratios, compact construction, better efficiency, high active material use and better ventilation and cooling [1][2][3][4][5]. They are suitable candidate in many applications, for example, fans, diesel and wind power units, elevators, ships, vehicles [6,7].…”

Section: Introductionmentioning

confidence: 99%

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New design solution for static eccentricity in single stator–single rotor axial flux induction motors

Nasiri‐Gheidari

Lesani

2013

IET Electric Power Applications

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This study proposes a new design solution for static eccentricity in axial flux induction motors (AFIMs). There are two definitions for static eccentricity in AFIMs. In the first approach, that is, commonly used for double-side machines, the rotor axis does not coincide with the stator bore but rotor rotates around its own shaft. So, the air-gap of motor is not uniform. Usually, in single stator-single rotor arrangement the rotor integrates with rotating parts of mechanical load. So, when static eccentricity occurs, air-gap length remains uniform. Rotor axis remains parallel with stator axis whereas it does not coincide with the stator bore. Based on the authors' knowledge, the latter approach has not been considered before. Therefore in this study a new definition for static eccentricity factor in direct drive is presented. Also, an optimisation is done to decrease the effect of static eccentricity on motor performance. The mathematical model of studied motor in transient and steady state is used based on d-q axis theory. In particular, the proposed model considers the effect of core saturation, and both approaches for modelling static eccentricity. Finally, studied motor is constructed and tested. All parameters of studied motor are calculated based on experimental measurements.

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“…Furthermore, adjustable air gap, more torque density, better cooling and ventilation and smaller moment of inertia have been mentioned as other advantages of such machines [1][2][3]. On the other hand, induction motor is the most common technology for industrial applications [4]. Therefore, it can be interesting to utilise the benefits of axial flux structure and induction motors, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Various skewing arrangements and relative position of dual rotor of an axial fluxinduction motor, modelling and performance evaluation

Nobahari

Darabi

Hassannia

2018

IET Electric Power Applications

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Using a dual air-gap structure in a disc-type motor is an effective solution to eliminate undesirable axial force between stator and rotor, by which higher power density can be achieved, too. Furthermore, some of the performance characteristics such as pulsating torque may be improved greatly by adjusting the existing extra selective design parameters in a dual air-gap motor. Accordingly, in this study, a widespread design consideration is carried out on rotor skewing arrangements of a dual rotor (DR) axial flux induction motor with the aim of pulsating torque reduction. The studied scenarios include when the slots of both rotors are skewed exactly similar with different skew angles, the slots of both rotors are skewed similarly but in the opposite directions and the slots of both rotors are not skewed but one rotor is mounted on the shaft by some shift angle relative to the other. The last one is introduced as an alternative to skewed rotors, which is easily executable in small and large size motors with DR topology. Moreover, an algorithm is proposed to determine the appropriate shift angle. Three-dimensional time stepping finite element analysis is employed in all cases for verification. Fig. 12 Torque waveforms at 20% slip for the initial design, skewed rotors and non-skewed shifted rotors

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Investigation of characteristics of a single‐phase axial flux induction motor using three‐dimensional finite element method and d − q model

Cited by 17 publications

References 42 publications

Axial Flux Resolver Design Techniques for Minimizing Position Error Due to Static Eccentricities

Axial Flux Resolver Design Techniques for Minimizing Position Error Due to Static Eccentricities

New design solution for static eccentricity in single stator–single rotor axial flux induction motors

Various skewing arrangements and relative position of dual rotor of an axial fluxinduction motor, modelling and performance evaluation

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