Given the full info on the nameplate I found this manual too: ftp://ftp.sdt.se/Documentation/BergerLahr/Manuals/3-PhaseSteppers/PI%2BVRDM368.pdf
but it might be the same one.
Yes, there is no huge distinction between a 3-phase brushless motor and a 3-phase stepper motor and a 3-phase permanent
magnet AC motor - steppers conventionally have a lot more effective poles via the toothed-pole profile trick, but they will
all respond to a 3-phase drive signal by turning.
These motors definitely fall in the stepper category with the step angles quoted.