Further Investigations on Unconventional Slot Numbers in Concentrated Winding Electric Motors: Rotor Eccentricity and Conventional Methods for Torque Ripple Reduction
More details
Hide details
1
Flensburg University of Applied Sciences, Flensburg, Germany
Power Electronics and Drives 2025;10 (45):96-109
KEYWORDS
TOPICS
ABSTRACT
Electric motors with unconventional slot numbers, especially prime numbers, have been shown to reduce cogging torque and torque
ripple. Our previous study investigated an 8p12s servo motor topology known to be prone to cogging torque and torque ripple; in this
publication, the research is expanded to a more robust 10p12s servomotor, including a comparison of the novel unconventional winding
with a conventional topology with breadloaf magnets. Furthermore, Finite element method (FEM) simulations with rotor eccentricities
are conducted to evaluate the impact of the novel topology on forces and torques under imperfect manufacturing. It is shown that
the novel quadruple-layer topology with prime number of slots can effectively reduce cogging torque and torque ripple. Furthermore,
the commonly used 10p12s servomotor topology can achieve similar performance using skewing and breadloaf permanent magnets.
The novel topology is shown to be prone to torque ripple due to rotor eccentricity. Similar results to conventional concentrated windings
can be achieved under imperfect manufacturing conditions.