Title :
Analytical approach to cogging torque calculation of PM brushless motors
Author :
Gieras, Jacek F.
Author_Institution :
United Technol. Res. Center, East Hartford, CT, USA
Abstract :
This paper discusses the approach to analytical calculation of the cogging torque in permanent-magnet (PM) brushless motors. Magnetic field energy in the air gap has been used to obtain the cogging torque equations. Two equations have been derived: with the PM circumferential width taken into account, and a simplified equation, i.e., without the effect of the finite width of the PM. The effect of eccentricity has also been included. Calculation results have been compared with laboratory test results.
Keywords :
air gaps; brushless machines; magnetic fields; permanent magnet motors; torque measurement; PM brushless motor; air gap; cogging torque calculation; magnetic field energy; permanent magnet brushless motor; Brushless motors; Equations; Forging; Magnetic analysis; Magnetic flux; Magnetic flux density; Permanent magnet motors; Pulse width modulation; Stators; Torque; AC motors; PM; PM motors; brushless motors; cogging torque; machines; magnetic flux density; permanent-magnet; stator slots; torque ripple;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2004.834108
