One-Dimensional Model for the Single-Sided Linear Induction Pump for Molten Metal

A simple one-dimensional model of the single-sided linear induction pump is presented. The electromagnetic fields and forces (thrust and lift) are obtained by using a semi-infinite geometry that neglects pump edge and end effects. The forces are subsequently derated for edge effects by means of correction factors. The field solution is also used to determine the air gap impedance, while conventional expressions from electric machine theory are used to determine the stator impedance. The throughput produced by a given thrust is determined by assuming turbulent slug flow. Throughput versus kVA characteristics are presented for a variety of pump operating conditions.