Single-Phase BLDC Claw-Pole Motor Design Improvements and Analyses

  • Stefan Leitner (Speaker)

Activity: Talk or presentationInvited talk at conference or symposiumScience to science


The increasing performance requirements on automotive auxiliary drives have led to a paradigm shift in the design of sub-fractional horsepower brushless direct current (BLDC) motors. While minimum cost used to be the primary design criteria, thereby accepting sub-optimal motor behavior, their overall performance is gaining in importance. The large cogging torque and torque ripple of single-phase BLDC motors, which often lead to disturbing structure- and airborne noise, have become unacceptable in many applications. However, the implementation of cogging torque reduction measures typically involves additional fabrication steps, thus increasing the cost, which is a disqualifier for mass-produced low-cost applications.
This talk presents single-phase BLDC motor designs in which the cogging torque and, in turn, the output torque ripple can be reduced at no increase to the manufacturing cost.
On the basis of the claw-pole motor topology, consisting of a ring winding housed between two specially shaped deep-drawn steel sheet parts, various design improvements are proposed and analyzed in detail. Therefore, different numerical models are developed in JMAG and used to study phenomena such as cogging torque, back-EMF, magnetic forces, and iron losses. Subsequently, the simulation results are verified by experiments, notably by rheometer-based techniques.
Period5 Oct 202016 Oct 2020
Event title2020 JMAG & PSIM Conference
: Powersys Simulation Solutions for Electrification
Event typeConference
LocationVirtuellShow on map
Degree of RecognitionInternational

Fields of Expertise

  • Mobility & Production