Doctoral Dissertations


A microscopic investigation of force generation in a permanent magnetic synchronous machine


Weidong Zhu

Keywords and Phrases

Maxwell Stress Tensor


"Traditional analysis of permanent magnet synchronous machines has focused upon establishing a relationship between the q- and d-axis stator current (or voltage) and the tangential component of electromagnetic force (torque), which is created to yield rotor rotation. Although useful, traditional analysis fails to consider the vector component-nature of force generation, i.e. that both radial and tangential components of force are created. The research described herein documents the effort to characterize the behavior of both radial and tangential components of force. Specifically, using a combination of analytical and numerical techniques, the influence of q- and d-axis stator current on both the radial and tangential component of airgap flux density is first evaluated. A Maxwell Stress Tensor approach is then used to evaluate the radial and tangential component of can conclude that the magnetic fields established create a significant component of force in a direction that does not produce rotor rotation"--Abstract, page iii.


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


University of Missouri--Rolla

Publication Date

Spring 2005

Journal article titles appearing in thesis/dissertation

  • Field reconstruction method for optimal control of permanent magnetic synchronous motors
  • Optimal operation strategies of permanent magnet synchronous motors


xi, 82 pages

Note about bibliography

Includes bibliographical references.


© 2005 Weidong Zhu, All rights reserved.

Document Type

Dissertation - Citation

File Type




Subject Headings

Permanent magnet motors
Electric motors, Synchronous
Force and energy

Thesis Number

T 8719

Print OCLC #


Link to Catalog Record

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