Abstract
In a linear induction motor with a plate-type conductor for its secondary circuit, the direction of the secondary current is not constant since the current flows in eddy. Consequently, there exists a non-active component of the current under stator cores which does not contributed to the thrust force. Accordingly, it is necessary to correct the stationary characteristics if they are estimated by a traditional method using the equivalent circuit and the circuit constant values.
In a previous paper, we derived a correction factor by calculating Mexwell's field equations to estimate the stationary characteristics more accurately. In this case, the secondary current components are divided into two-dimensions that is a core stack direction and a travelling field direction. However, the correction factor derived from the field equations, contains some error, because the primary current is treated as a current sheet and the influence of the pole pitch of primary winding on the stationary characteristics is ignored.
In the present paper, secondary current flow is measured in the plate-shaped conductor of the experimental model, and the correction values are estimated from the measured results.
The correction factors derived from experimental results and the values given by Maxwell's field equations coincide approximately, and the values derived from the experiments give evidence of the influence of the pole pitch on the stationary characteristics. With these results, we need to revise the correction factor derived from Maxwell's field equations in the earlier report.
