I have a particular vacuum pump that I may rewire for single phase. Right now it has a big old 3phase 2 HP motor. Very big for the HP on the nameplate.
Harbor Freight sells 56 frame motors that they somewhat vaguely refer to "use with compressors rated for 3 hp that were previously rated for5 HP".
The FLA rating on the HF motor (15A) is similar to FLA rating on the real 3 HP Baldor motor that I have on my compressor (16 A):