Magnetic Field and Force of Linear Induction Motor Fed From Non-sinusoidal Source

Performances of rotating induction machines fed from a non-sinusoidal source have been investigated rather thoroughly whereas this same problem for linear machines has received much less attention 1,2,3. The first published papers report an appreciable influence of the higher time harmonics on primary losses and their negligible influence on terminal performances. This paper describes computational and experimental results relating to the influence of a non-sinusoidal supply on the magnetic field and force of a small single-sided LIM controlled with variable-voltage-fixed-freguency /VVFF/ pattern. Theoretical analysis based on the Fourier series method, validated by experimental data, confirms the conclusion about a negligible influence of the higher time harmonics in the exciting current on a LIM performance.