Impact of Selected Methods of Cogging Torque Reduction in Multipolar Permanent-Magnet Machines

Zbigniew Goryca, Sebastian Różowicz, Antoni Różowicz, Artur Pakosz, Marcin Leśko and Henryk Wachta
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Zbigniew Goryca: Faculty of Environmental, Geomatic and Energy Engineering at the Kielce University of Technology, al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland
Sebastian Różowicz: Department of Industrial Electrical Engineering and Automatic Control, Kielce University of Technology, 7 Tysiąclecia Państwa Polskiego Str., 25-314 Kielce, Poland
Antoni Różowicz: Department of Industrial Electrical Engineering and Automatic Control, Kielce University of Technology, 7 Tysiąclecia Państwa Polskiego Str., 25-314 Kielce, Poland
Artur Pakosz: Research and Development Department, the Central Military Bureau of Design and Technology, 03-244 Warszawa, Poland
Marcin Leśko: Department of Power Electronics and Power Engineering, Rzeszow University of Technology, Wincentego Pola 2, 35-959 Rzeszow, Poland
Henryk Wachta: Department of Power Electronics and Power Engineering, Rzeszow University of Technology, Wincentego Pola 2, 35-959 Rzeszow, Poland

Energies, 2020, vol. 13, issue 22, 1-14

Abstract: This paper focuses on the matter of cogging torque reduction by combining various methods of cogging torque minimization. Due to the high costs of prototype construction, cogging torque is minimized during the design phase by using numerical methods, while computer simulations are used to find a magnetic circuit arrangement for which the cogging torque has the smallest possible value. Cogging torque occurs as a result of combined impact of the magnetic field of a permanent magnet located at rotor and stator with variable magnetic conductivity depending on an angle of rotation. It is a pulsating torque and occurs permanently during machine operation, impacting the operation of the entire device cooperating with the electric machine and causing vibrations, tension, and noise. It results in braking torque and subsequent power losses and leads to faster wear and tear of machine structural elements. High cogging torque values cause problems with rotational speed adjustment. In the case of electric generators used in wind power plants, it impedes the start-up of power plants at high wind speeds. Considering the above, the reduction of cogging torque in permanent-magnet machines is extremely important.

Keywords: cogging torque; cogging torque minimization; finite element method; magnet machines; multipolar (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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