Title :
Hybrid Approach for Determining Eddy-Current Losses in High-Speed PM Rotors
Author :
Saban, Daniel M. ; Lipo, Thomas A.
Author_Institution :
Direct Drive Syst., Cerritos
Abstract :
This paper presents a novel method for calculating rotor eddy-current losses of PM machines using an analytically derived current sheet (2D) in combination with commercially available FE software (3D). First, an equation-based approach is used to determine the total magnetic field at the stator inner diameter. A 2D current sheet is formulated from the total field in the rotor reference frame. Next, the 2D current sheet is extended axially and used in a 3D FE analysis of the machines un-magnetized rotor. Using this procedure, rotor loss caused by armature current time harmonics, slot permeance variation and winding MMF harmonics has been calculated that properly considers axial variation with limited computing resources.
Keywords :
eddy current losses; finite element analysis; harmonics; permanent magnet machines; 2D current sheet; 3D FE analysis; FE software; armature current time harmonics; eddy-current losses; equation-based approach; high-speed PM rotors; machines un-magnetized rotor; permanent magnet machines; rotor reference frame; slot permeance variation; stator inner diameter; total magnetic field; winding MMF harmonics; Drives; Equations; Iron; Magnetic analysis; Magnetic fields; Permanent magnets; Solids; Stator windings; Time domain analysis; Voltage;
Conference_Titel :
Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International
Conference_Location :
Antalya
Print_ISBN :
1-4244-0742-7
Electronic_ISBN :
1-4244-0743-5
DOI :
10.1109/IEMDC.2007.382745
