Research on Electric and Magnetic Asymmetry of Linear and Arc Motors

Abstract

Issues concerning the experimental investigation on linear and arc motors as well as their usage in mechatronic system are discussed. The research proved that due to an open magnetic circuit in such type of motors there is formed inner electric and magnetic asymmetry, exhibiting itself by causing different currents in the phases of an inductor and providing unequal concentration of magnetic field in conformity with the longitudinal and transversal axes of the motor. The qualitative expression of such a type of asymmetry is regarded as longitudinal and transverse edge effects phenomenon limiting the application possibilities of such kind of motors. Experimentally there have been carried out the research on three dipolar linear and arc motors with secondary elements of different width.The results of the experimental research were provided, when motors were alternating – current supply from symmetric voltage sources of 50 Hz and 400 Hz frequency. For magnetic field simulation of a linear and arc motor there has been used software package Maxwell SV 9.0 worked out by ,,Ansoft“ company. There has also been investigated the distribution of magnetic flux lines in the motor under the condition of different substances used for the secondary element and by changing the frequency of the current of the inductor and the size of air gap. The results of the experimental research and modeling prove the structure of the magnetic field of motors to be a rather complicated one, for the analysis of which there are required new and sufficiently accurate mathematical models. The means and measures for edges effects and asymmetry compensation are being discused. Il. 5, bibl. 7 (in English; summaries in English, Russian and Lithuanian).