Finite-Element Analysis for a Rolling-Rotor Electrical Machine

Arkkio, Antero; Biernat, Adam; Bucki, Bogdan; Kamiński, G.; Niemenmaa, A.; Smak, Andrzej; Staszewski, P.

doi:10.1109/tmag.2010.2044234

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Figure 7a shows an electric machine with an eccentric gap that has been studied in [93]. As is evident in Figure 7b, the airgap will reach almost zero at the points of contact between the stator and the rotor [94]. Reaching a minimal airgap in these machines leads to a higher force and consequently a higher electromagnetic torque.…”

Section: Machines With Eccentric Airgapsmentioning

confidence: 99%

High-Torque Electric Machines: State of the Art and Comparison

Alibeik

Santos

2022

Machines

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The state of the art of high-torque electric motors has been reviewed in this paper. This paper presents a literature review of high-torque density electric machines based on their airgap classifications, which brings a unique consideration to new design ideas to increase torque density. Electric machines are classified into three main groups based on their airgap configuration, i.e., (1) machines with a constant airgap, (2) machines with a variable airgap, and (3) machines with an eccentric airgap. This paper also presents the modeling of a high-torque airgap-less electric motor based on the concept of eccentric airgap. The torque density of this motor has been compared to motors available in the literature review. Among electrical motors with no permanent-magnet, airgap-less electric motors take the lead in terms of torque density, which is almost five times greater than the next motor, “in-wheel for electric vehicle”.

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Section: Machines With Eccentric Airgapsmentioning

confidence: 99%

High-Torque Electric Machines: State of the Art and Comparison

Alibeik

Santos

2022

Machines

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“…The literature offers several solutions, which provide low speed of rotation and large torque. The closest to the rolling rotor actuator proposed in this work is represented Manuscript by the interior rolling rotor engine, massive or lamellar, proposed by Moskvitin, in 1944 [1], and discussed with great interest in recent years, in the literature [2,3,4,5,6]. Rolling rotor engine may offer rotational speeds and high torque, standing out due to its low speed motor drives and being used in many technical applications.…”

Section: Introductionmentioning

confidence: 99%

A novel design of a rolling rotor actuator with axial air gap

Ungureanu

Graur

2014

2014 International Symposium on Fundamentals of Electrical Engineering (ISFEE)

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The paper presents a new type of actuator consisting of a flat stator, above which a rigid disk-shaped rotor, without windings is placed. Between the rotor and each enabled stator winding, an electromagnetic force is generated, which causes the rotor inclination change in the direction of activated pole. Successive stator winding-switching leads to the change of the contact point position between rotor and stator, which will rotate with an angular speed of frequency-dependent commutation of the stator magnetic windings. In a complete cycle of activation/switching, mobile support point rotates by an angle equal to 2ʌ radians, and the rolling rotor, together with the spindle support, will make a much smaller angular displacement. On the basis of electromagnetic axial forces developed by the stator and friction forces between rotor and stator, the actuator develops relatively large torque at low speeds, up to a few revolutions per minute, without using mechanical gears. The rolling rotor actuator is characterized by constructive simplicity, excellent controllability, long operating life, and it can be used at low speed drives instead of classic motor gears. This paper presents a method to achieve this type of rolling rotor actuator (RRA) with axial gap as well as, operating characteristics reflected in rotor angular velocity as a function of stator angular velocity. The mechanical speed reduction ratio and the starting torque as function of stator angular velocity is also presented.Index Terms-axial electromagnetic forces, angular velocity control, low rotational speed, rolling disk-shaped rotor, axial air gap.

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Transient Performance of the Selectively Passive Compulsator

Yan

Tan

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Shorted compensating windings or non-uniform conductive shield can be used in a selectively passive compulsator to compensate the field produced by the armature winding, thus to reduce the impedance and increase the amplitude of the output current. The compensating effect on the inductance of the armature winding changes while the rotor rotates, so it is possible for selective compensation to output a flat top current pulse. A finite element analytical model is proposed in this paper. The electromotive force is firstly calculated. The losses in the rotor core and the eddy current induced in the compensating are analyzed under different frequencies. A flat top current pulse is provided in the armature winding to analyze the transient characteristics including inductance, eddy current and loss.

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Finite-Element Analysis for a Rolling-Rotor Electrical Machine

Cited by 6 publications

References 5 publications

High-Torque Electric Machines: State of the Art and Comparison

High-Torque Electric Machines: State of the Art and Comparison

A novel design of a rolling rotor actuator with axial air gap

Transient Performance of the Selectively Passive Compulsator

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