Basic principle and design criteria of axial-flux PM machines having counterrotating rotors

Caricchi, F.; Crescimbini, Fabio; Santini, E.

doi:10.1109/28.464520

Cited by 43 publications

(25 citation statements)

References 1 publication

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“…When a three-phase supply is applied to this winding arrangement, the armature fields in the inner and outer air gaps will rotate in opposite directions. The configuration was originally suggested by Caricchi et al [10].…”

Section: Stator Winding Arrangementmentioning

confidence: 94%

“…In this article, the nature of the undesirable inter-rotor interaction through common stator core flux paths that arises in this type of machine topology is studied in greater detail. These effects have not been properly assessed in previous studies concerned with electrical machines equipped with contra-rotating rotors [10]. It is emphasized that the general findings regarding these flux interactions are relevant both to axial and radial flux contra-rotating machine topologies with surfacemounted PMs.…”

Section: Introductionmentioning

confidence: 95%

“…Such a machine was realized by Caricchi et al [10], who suggested an application for this machine topology in a ship propulsion system where an additional contra-rotating propeller recovers energy from the main propeller slip stream. AFPM machines with contra-rotating rotors could also find a natural use in small-scale hydropower plants and in tidal current energy conversion schemes, where hydraulic turbine concepts with two contra-rotating stages have recently been implemented [11,12].…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Finite Element Analysis of a Permanent Magnet Machine with Two Contra-rotating Rotors

Ranlöf

Lundin

2009

Electric Power Components and Systems

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Electrical machines with contra-rotating rotors find applications in directdrive energy conversion systems and in ship propulsion systems that employ hydraulic machinery with two contra-rotating stages. In this article, the operating characteristics of permanent magnet machines with two contra-rotating rotors moving on opposite sides of a common stator core are studied via two-dimensional finite element analysis. Particular attention is devoted to the special flux distortion patterns that arise in contra-rotating machine topologies. The study suggests that the introduction of a screening iron core between the rotors provides for negligible flux distortion levels during contra-rotating synchronous operation of the two rotors.

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Section: Stator Winding Arrangementmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Finite Element Analysis of a Permanent Magnet Machine with Two Contra-rotating Rotors

Ranlöf

Lundin

2009

Electric Power Components and Systems

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“…The input torque T m is split into T 11 and T 12 by the sun gear (1) and (5), as shown in Fig. 3(a).…”

Section: Reactive Torque On the Hullmentioning

confidence: 99%

“…The reason is that it offers significant advantages over conventional systems driven by diesel engines and gas turbines [1]. Electrical propulsion systems are inherently silent, and their power generation system can be easily positioned anywhere in the UUV.…”

Section: Introductionmentioning

confidence: 99%

Analysis of power flow in a counter-rotating epicyclic gearing for electrical propulsion system

Shi

Qin

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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A novel compound epicyclic gearing that combines a planetary gear train with a differential gear train is designed for an electrical propulsion system of underwater unmanned vehicles. This epicyclic gearing can transform a single input into two counter-rotating outputs with equal torque amplitudes and speeds. Based on the analysis method of power flow in the differential gear train, the character of the power flow of the compound epicyclic gearing was determined. After comparing with the power distribution of input flow, the condition of this mechanism without power recirculation was investigated. Because the reactive torque of the motor stator is balanced by the torque on ring gear of planetary gear train, no net torque acts on the vessel being propelled.

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Electromagnetic Characteristics Analysis of a Novel Differential Dual‐Rotor Contra‐Rotating Axial‐Flux PM Motor with Equidirectional Toroidal Winding

Liao,

Li,

Nie

et al. 2023

IEEJ Transactions Elec Engng

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In this paper, a novel differential dual‐rotor contra‐rotating axial‐flux PM (DDC‐AFPM) motor with equidirectional toroidal winding (EDTW) applied to electric propulsion of ships is proposed. Different from the conventional AFPM motor with contra‐rotating rotors (CR), the rotors of the proposed motor on both sides of the stator rotate oppositely at different speeds. The structure of the proposed motor is introduced and the operation principle is clarified. Initial parameters of the proposed motor are given, and the correctness of the simulation results is indirectly verified through the prototype of the AFPM motor with dual‐rotor and EDTW. In order to further improve the electromagnetic performance of the proposed motor, parameters of the motor are preliminarily improved. Finally, the electromagnetic characteristics including armature field, no‐load and on‐load characteristics of the proposed motor are analyzed based on three‐dimensional finite element method (3D‐FEM). The simulation results show that the proposed motor has good electromagnetic characteristics and is suitable for ship propulsion. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Basic principle and design criteria of axial-flux PM machines having counterrotating rotors

Cited by 43 publications

References 1 publication

Finite Element Analysis of a Permanent Magnet Machine with Two Contra-rotating Rotors

Finite Element Analysis of a Permanent Magnet Machine with Two Contra-rotating Rotors

Analysis of power flow in a counter-rotating epicyclic gearing for electrical propulsion system

Electromagnetic Characteristics Analysis of a Novel Differential Dual‐Rotor Contra‐Rotating Axial‐Flux PM Motor with Equidirectional Toroidal Winding

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