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Abstract

Disk motors are characterized by the axial direction of main magnetic flux and the variable length of the magnetic flux path along varying stator/rotor radii. This is why it is generally accepted that reliable electromagnetic calculations for such machines should be carried out using the FEM for 3D models. The 3D approach makes it possible to take into account an entire spectrum of different effects. Such computational analysis is very time-consuming, this is in particular true for machines with one magnetic axis only. An alternate computational method based on a 2D FEM model of a cylindrical motor is proposed in the paper. The obtained calculation results have been verified by means of lab test results for a physical model. The proposed method leads to a significant decrease of computational time, i.e. the decrease of iterative search for the most advantageous design.

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Authors and Affiliations

Tomasz Wolnik
ORCID: ORCID
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Abstract

Fractional slot PMSM motors enable high power density factors to be obtained provided that their electromagnetic circuit, appropriate mechanical structure and cooling system are properly designed, as well as when operating at a high frequency of power supply voltage (400–800 Hz) with high magnetic saturation and high current loads (approx. 12–15 A/mm2). Such operating conditions, especially in the case of fractional slot motors, may be the reason for excessive rotor losses, mainly in the rotor yoke and permanent magnets. One of the conditions for obtaining high values of continuous power of the motor is the reduction of these losses. This paper presents selected design methods for limiting the value of rotor losses with simultaneous consideration of their influence on other motor parameters. The analysiswas carried out for aPMSMmotor with an external rotorweighting approx. 10 kg and a maximum power of 50 kW at a rotational speed of 4 800 rpm.
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Authors and Affiliations

Tomasz Wolnik
1
ORCID: ORCID
Szczepan Opach
1
ORCID: ORCID
Łukasz Cyganik
1
ORCID: ORCID
Tomasz Jarek
1
ORCID: ORCID
Vojtech Szekeres
1
ORCID: ORCID

  1. Łukasiewicz Research Network – Institute of Electrical Drives and Machines KOMEL, Al. Rozdzienskiego 188, 40-203 Katowice, Poland

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