Abstract
This paper presents the analysis of a novel
Synchronous Reluctance Motor (SynRM), which has an axially
sinusoidal rotor lamination shape. The sinusoidal lamination
shape is used to vary magnetic flux in the q-axis direction.
Therefore, cancelling some torque harmonics produced by stator
slotting effects and rotor anisotropy, while maintaining the
average torque. The stator of a 5.5 kW, 4-pole, 50 Hz
conventional three-phase squirrel cage induction motor, with
distributed and chorded by one slot, double layer winding, is
used for both standard and novel motors. The Finite Element
Analysis (FEM) is used to study the electromagnetic parameters
of interests. The FEA results are validated by means of practical
measurements. The results obtained from both FEA and
practical measurements evidenced that the novel SynRM
dropped tremendously the torque ripple contents while still
maintained the average torque. The drop in torque ripple
contents is mainly due to mitigation of the most dominant torque
harmonics caused by stator slotting and rotor anisotropy.