Abstract
In this paper original analytical models to determine the electromagnetic performances of segmented permanent magnet synchronous machines (with removed active parts in the stator or the rotor) are presented. These models are adapted to PMSM with large air gap width, large diameter, a high number of poles and large angular gaps. This method based on analytical approach is validated by comparizon with a 2D Finite Element calculation (Altair FluxTM 2D) for the specifications of a large diameter, low speed tidal high power current turbine generator. The presented method allows fast and accurate evaluation of the performances of this kind of particular machine and can be used in a systematic design process.
Highlights
The presented study deals with unconventional structures of Permanent Magnet Synchronous electrical machines
In this paper original analytical models to determine the electromagnetic performances of segmented permanent magnet synchronous machines are presented
This method based on analytical approach is validated by comparizon with a 2D Finite Element calculation (Altair FluxTM 2D) for the specifications of a large diameter, low speed tidal high power current turbine generator
Summary
The presented study deals with unconventional structures of Permanent Magnet Synchronous (shortened as PMS) electrical machines. Using ferromagnetic materials in the gap leads to a better cooling than if non-metallic gaps are used because the internal heat sources (losses) can be evacuated by these non-active metallic parts These very unconventional structures can be used to reduce the losses part related to the end-windings in very large diameter electrical machines with small axial length and/or to increase efficiency and reliability [5,6]. Large diameter PMS machines with a high number of poles and with surface mounted radially magnetized magnet are considered This kind of machines are widely used in naval propulsion application or associated with tidal or wind turbines for renewable power generation [7,8]. It can be noted that for all the presented analytical models, the iron core material magnetic permeability is classically considered to be infinite ( the influence of the value of the iron permeability is negligible because iron permeability is very high compared to other material permeability)
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