Analysis and simulation of a Lorentz-type slotless, self-bearing motor

Lyndon S. Stephens, Dae Gon Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A slotless self-bearing motor design is analyzed. The proposed design eliminates the trade-off between motoring torque and bearing force with respect to PM thickness found in many recent designs. Expressions for torque and radial force production are derived, including both control-type forces and destabilizing side-pull forces. The feedback control algorithm and simulated results are also presented. The analysis indicates that: (1) independent torque and bearing force is achieved for a large number of PM pole pairs; (2) the magnitude of both torque and bearing force increases with PM thickness; and (3) the motor is capable of stable operation as long as the winding current phase shift with respect to the PM flux is small.

Original languageEnglish
Pages (from-to)899-905
Number of pages7
JournalControl Engineering Practice
Issue number8
StatePublished - Aug 2002


  • Bearings motors
  • Magnetic bearings
  • Self-bearing motors

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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