0011-4561 Compared analysis of lspm sm and squirrel-cage motor exploitation with variable rotational speed Compared analysis of lspm sm and squirrel-cage motor exploitation with variable rotational speed Idziak Paweł author Barański Mariusz author Łyskawiński Wiesław author Electrical Machines and Mechatronics, Faculty of Electrical Engineering, Poznan University of Technology Correspondence to: Paweł Idziak Correspondence to: Mariusz Barański Correspondence to: Wiesław Łyskawiński 16 12 2015 Elektrotechnika Zeszyt 1-E (8) 2015 2015 203 208 Copyright © 2015 2015 <p style="text-align: justify;"> In this paper, the steady-states operation of a line start permanent magnet synchronous motor (LSPMSM) and a squirrel-cage motor have been compared. The stator of a Sg 100L-4B type, 3 kW induction motor, was used in both structures. The squirrel cage in the rotor of the LSPMSM is made from copper. The influence of the frequency change of the supply voltage on the motor’s efficiency and current as well as the power factor has been examined.</p>