An analytical model for predicting the characteristics of variable airgap linear force motors is developed. the model takes into account magnetic losses including the leakage and fringing effects and the reluctance existing at the contacts between permanent magnets and pole pieces. the model is validated by comparing its predicted characteristics with the results obtained from experiments and a finite element program. with the use of the modelled characteristics, computer programs based on the method of constrained steepest descent with state equations are developed for automating and optimising the design of linear force motors. Numerical studies are made for both minimisation of weight and minimisation of power consumption.


Mechanical and Aerospace Engineering

Keywords and Phrases

Analytical Model; Computer Programs; Constrained Steepest Descent; Design Automation; Electric Machine CAD; Equivalent Circuits; Fringing Effects; Leakage; Linear Force Motors; Linear Motors; Magnetic Circuits; Magnetic Losses; Optimal Design; Optimisation; Permanent Magnets; Power Consumption Minimisation; Reluctance; State Equations; Variable Airgap; Weight Minimisation

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





© 1988 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 1988