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A five pole, one slot per phase, full pitch, twelve coil, wye connected, three phase linear induction pump has been designed for operation with 400 C sodium. The design incorporated a graded winding in order to reduce the net pulsating component of the magnetic flux density wave and a pump duct using copper side bars. The small laboratory-size pump was designed in two steps: stator design and winding design. First, the stator and core dimensions were established on the basis of maximum pressure development and maximum power at the design flow and slip. Maximum pressure output was a requirement of the intended pump application. The condition of maximum power output was used in order to provide a good pump efficiency. Second, the parameters for the induction pump equivalent circuit were determined for several winding methods. The winding method which offered 3920 ampere turns per phase (equivalent to a flow rate of 4. 88 gpm, a pressure of 60 psi, a line voltage of 250 volts, and a wave length of 21.2 cm as calculated in the first step) was selected. The theoretical performance characteristics of the flat induction pump were computed using the equivalent circuit parameters for a winding with 60 turns per coil. The measurement of developed pressure (0 to 42. 13 psi), sodium flow rate (0 to 9. 93 gpm), and power input (0 to 103. 9 watts) after installation of the pump in an operational sodium circulating loop provided an experimental determination of the pump performance characteristic. In addition, the effect of pump duct temperature on sodium flow rate and a differential transformer system used to locate the sodium level in manometer columns were briefly discussed .

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