A unique topological configuration for rotating electromagnetic machin
es that can produce significantly higher force density than an inducti
on machine is investigated. The stator is constructed using full pitch
concentrated windings embedded in conventional slots. Rotor saliency
is produced using poles constructed of axially oriented laminations. O
peration is such that all of the conductors are actively taking part i
n torque production all of the time. The means for exciting the stator
windings allows for independent control of torque and regulation of t
he rotor flux. A force density comparison is made based on operation w
ith equal surface current density, conduction losses, and peak air-gap
flux density. Construction and testing of a prototype 500-rpm, 28-kW
laboratory machine, converter, and controller are described.