抄録
It is expected to establish an analytic method and performance equations more suitable for estimation the characteristics and design a reasonable LIM. An approximation for simplified computing the performance of single-sided linear induction motor is presented. The original equations was derived from the two-dimensional electromagnetic analysis and the equivalent circuit quantities, such as magnetizing reactance, secondary resistance and secondary reactance, was expressed in combination with hyperbolic function and trigonometric function of complex number.
In this paper, these functions are approximated by the Maclaurin's expansion and the equivalent circuit quantities are expressed by polynomial approximation. Both computed thrust, primary current, power factor and efficiency-slip curves for the test SLIM for urban transit at Kyushu university calculated by the original equation and the new approximation show a close agreement. Even without the former complicated calculation, we can use the proposed convenient approximation. The magnetizing reactance plays an important role in the LIM performance and the larger, the better. The ratio of air gap length to pole pitch holds the key to goodness of LIM.
