XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

XIX Sympozjum PTZE, Worliny 2009
characteristics depend on the winding design, as well. In case of the design presented in Fig.
2b, more copper material can be placed in the active part of AFPMSM. The active part
presents the part of the machine, where the influence of magnetic flux density on the
AFPMSM characteristic is not negligible. On the other hand, it is not always necessary to
place as much copper as possible in the coreless stator, especially when constructing
AFPMSMs with larger diameters, where plenty of space is available. For this reason the
winding design presented in Fig. 2a is often chosen.
ro-ri
ro-ri
Fig. 2. Winding designs of AFPMSM.
Influence of winding design on static characteristics of AFPMSM
Right-hand side of Fig. 3 presents the electrical current, current density, copper wire crosssection
and the number of turns in dependency on the coil and stator width. On the left-hand
side of Fig. 3 the comparison of analytically calculated back EMF for both winding designs
(Fig. 2) is presented. Fig. 4 presents the comparison of static torque and normal force
according to displacement at 5A/mm 2 and 4,94A/mm.
Back EMF (V)
Fig. 3. Left: Back EMF according to displacement.
Right: electrical and dimensional parameters in dependency on coil and stator width.
I (A), J (A/mm 2 ), S (mm 2 ), N (turns)
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