Title :
Performance analysis of a coreless permanent magnet brushless motor
Author :
Gieras, Jacek F. ; Gieras, Izabella A.
Author_Institution :
United Technol. Res. Center, East Hartford, CT, USA
Abstract :
The paper deals with a new disk type PM brushless motor consisting of only stator (armature) winding and permanent magnet (PM) excitation system. No stator and rotor ferromagnetic cores have been used. To obtain the required value of the magnetic flux density in the air gap, PMs have been arranged in the so called "Halbach array". The FEM analysis has been done to prove that in a double sided motor with internal stator (twin PM rotor embracing a coreless stator), the peak value of the magnetic flux density can exceed 0.6 T. This is a sufficient value to design a high power density machine. A low speed 10 kW motor has approximately 1% higher efficiency and provides 82% more output power per kilogram than its cylindrical counterpart with a ferromagnetic core.
Keywords :
air gaps; finite element analysis; magnetic flux; permanent magnet motors; stators; 10 kW; FEM analysis; Halbach array; PM excitation system; air gap; armature winding; brushless motors; coreless design; coreless stator; disk type PM brushless motor; double sided motor; high power density machine; internal stator; low speed motor; magnetic flux density; permanent magnet excitation system; permanent magnets; stator winding; Brushless motors; Magnetic cores; Magnetic flux density; Performance analysis; Rotors; Shafts; Stator cores; Stator windings; Synchronous motors; Torque;
Conference_Titel :
Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-7420-7
DOI :
10.1109/IAS.2002.1042794
