1 research outputs found
Mathematical Model of a PM Brushless Motor With Different Stator-Rotor Pole Pairs Number
The paper presents a mathematical model of
Permanent Magnet AC brushless machines (PMSM) having a
number of stator poles-obtained via the distribution of the
three-phase winding- different from the rotor one, realized by
the displacement of the permanent magnets. For these so-
called ‘Fractional-Slot’ motors (where few total slots generate
high equivalent number of poles) the available mathematical
models appear partial and/or incomplete, despite of numerous
designing considerations made in literature. In this paper an
analytical approach is developed to point out an instantaneous-
values mathematical model with concentrated parameters, that
can be suitable for control architecture systems when some
simplification hypotheses are added. The model takes into
account a general distribution of the armature magnetomotive
force field, and the total harmonic content of the rotor flux
density. The whole MMF harmonic content is then properly
reduced and the result is compared to a traditional PMSM
mode