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Magnetic Materials 2018
Materials Science and Nanotechnology
|
Volume 2
MAGNETISM AND
MAGNETIC MATERIALS
2
nd
International Conference on
Mater Sci Nanotechnol 2018, Volume 2
TWO-DIMENSIONAL ANALYTICAL CALCULATION METHOD TO ANALYZE
THE MAGNETIC COMPONENTS OF A SUPER ELLIPSOIDAL CAVITY
MAGNET FOR A CLAW POLE ROTOR OF AN ALTERNATOR
Senthil Ram Nagapillai Durairaj, Praveen Chakrapani Rao, Muruganandam Radhakrishnan
and
Thulasirajan
Ganesan
Comstar Automotive Technologies Pvt. Ltd., India
S
uper ellipsoidal cavity magnet is a novel design, which has a shallow cavity on the surface of the magnet to improve the
surface flux density on the magnetic poles and to reduce the leakage flux at the pole interface of the magnet. The super
ellipsoidal cavity is created on one surface of the edge chamfered cuboid magnet, which are interposed between the interpole
gaps of the claw pole rotor assembly. This paper aims to prove the improved magnetic flux density on the magnetic poles which
is analytically analyzed using magnetic vector potential equation and the same has been characterized by comparing it against
the simulation of the magnet. The super ellipsoidal cavity magnet is further studied to understand the total magnetic moment
change in the volumetric flux, due to the change in volume of the magnet and predicted using the below equation,
Where Br is the remanence flux density, K
c
Helmholtz coil constant,Φ is the volumetric flux and V
m
is the volume of the magnet.
The total magnetic moment m is the product of coil constant and volumetric flux of the magnet which is denoted by the equation