ABSTRACT
In general, the following specifications make up the design theme of a variable speed PMSM:
- Base continuous power, Pb
- Base speed, nb
- Maximum voltage, Vn
- Overload factor, kl
- Maximum speed, nmax
- Power at maximum speed, Pmax
- Number of phases, m
Also a few constraints are added:
- Efficiency at Pb and nb
- Material insulation class (allowed temperature)
- Protection degree against alien bodies
- Total initial cost of active materials
Flux weakening (nmax/nb > 1.5) is not very feasible with surface PMSMs (SPMSMs) (unless their synchronous inductance, Ls, is large in pu, such as for tooth-wound stator windings), and, thus, nmax = nb.
