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Home > Issues > RetrieveInvestigation of Torque Ripple in an Induction Motor with Respect to Slot Number Combinations
Journal of Magnetics, Volume 27, Number 1, 31 Mar 2022, Pages 18-27
Yongha Choo (Department of Electrical and Computer Engineering, Pusan National University), Changhwan Kim (Department of Electrical and Computer Engineering, Pusan National University), Gyeonghwan Yun (Department of Electrical and Computer Engineering, Pusan National University), Cheewoo Lee * 
(Department of Electrical and Computer Engineering, Pusan National University)
(Department of Electrical and Computer Engineering, Pusan National University)
Abstract
In this study, the harmonic orders of varying magnetic flux density with respect to slot combinations are scrutinized
through a spatial and temporal fast Fourier transform. A three-phase four-pole induction motor is
selected, and, as its base model, 36 and 28 slots are set up in the stator and rotor, respectively. Eleven models
with different numbers of rotor slots were designed to study torque ripples with respect to slot combinations.
The correlation between torque ripple and slot harmonics in a stator and rotor is described thoroughly by comparing
the tangential and radial magnetic flux densities in the air gap, tangential force density, and harmonic
orders in torque. Some models having deteriorated torque ripples have one or more slot harmonic orders in
common in the stator and rotor. The other models exhibit the same commonalities, but a small torque ripple
occurs because of the high harmonic orders. Models with 24 stator slots are investigated through the same procedure
to generalize the relationship between torque ripple and slot harmonics in 36 stator slots.
through a spatial and temporal fast Fourier transform. A three-phase four-pole induction motor is
selected, and, as its base model, 36 and 28 slots are set up in the stator and rotor, respectively. Eleven models
with different numbers of rotor slots were designed to study torque ripples with respect to slot combinations.
The correlation between torque ripple and slot harmonics in a stator and rotor is described thoroughly by comparing
the tangential and radial magnetic flux densities in the air gap, tangential force density, and harmonic
orders in torque. Some models having deteriorated torque ripples have one or more slot harmonic orders in
common in the stator and rotor. The other models exhibit the same commonalities, but a small torque ripple
occurs because of the high harmonic orders. Models with 24 stator slots are investigated through the same procedure
to generalize the relationship between torque ripple and slot harmonics in 36 stator slots.
Keywords: Induction motor; torque ripple; flux density; slot combination
DOI: https://doi.org/10.4283/JMAG.2022.27.1.018
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