A $30,000hp,13\mathrm{.}8kV,3-$phase, $60$ Hz air$-$to$-$water cooled induction motor drives a turbo compressor in a large oxygen manufacturing plant. The motor runs at an exact full$-$load speed of $1782\mathrm{.}6\frac{r}{m}in$ and by means of a gearbox, it drives the compressor at a speed of $5064\frac{r}{m}in.$ The motor has an efficiency of $89\mathrm{.}9\%$ and a power factor of $0\mathrm{.}78.$ The LR torque and the current are respectively $0\mathrm{.}7$ pu and $4\mathrm{.}8$ pu $.$