What is the slot/pole combination of main EV/HEV e-powertrains?

Application to e-NVH

The slot/pole combination and e-motor topology (induction machine Vs synchronous machine, radial Vs axial flux, internal Vs external rotor) determine the characteristic spectra of slotting magnetic forces responsible for part of electromagnetic noise and vibrations.

Summary

Using sound and vibration measurements or scientific publications, EOMYS is updating on this webpage a list of some traction motor slot/pole combinations used in commercial EV/HEV automotive applications.

Notation 36s28r6p means 48 stator slots, 28 rotor slots (if applicable), and 6 poles (p=3 pole pairs). All topologies are radial flux machines with internal rotor (for now).

If you know about some more numbers to be added in this table, please send us the information using the contact page.

EV/HEV electric traction motor characteristics
BrandModelTypeSlot/poleSkewPhase number
Audie-Tron 55 quattroSCIM48s58r4p?3
BMWi3IPMSM72s12pno3
BMWix3WRSM54s6pno3
GMChevyBoltIPMSM72s12p2-step rotor linear skew3
HondaAccordSPMSM24s16pno3
HyundaiIonicIPMSM48s8p?3
Jaguari-Pace EV400 SIPMSM48s8p?3
MercedesEQC 400 4MATICSCIM??3
MercedesEQSIPMSM48s8p?3
MitsubishiOutlanderIPMSM??2×3 ?
NissanLeafIPMSM48s8p2-step rotor linear skew3
OpelAmperaIPMSM72s12p2-step rotor linear skew3
PorscheTaycanIPMSM48s8p?3
RenaultTwizySCIM36s48r4p?3
RenaultZoeWRSM48s8pno3
SmartForTwoPMSM36s12p?3
TeslaSSCIM60s74r4p?3
Tesla3SCIM (rear)60s74r4p?3
Tesla3IPMSM (front)54s6p4-step rotor V-skew3
TeslaXSCIM60s74r4p?3
TeslaYIPMSM54s6p?3
ToyotaPrius 2004IPMSM48s8pno3
VWe-upIPMSM60s??3
VWID4IPMSM48s8p4-step rotor linear skew3

If you look for more precise geometries, some of these electrical machines may have been modelled within Pyleecan open-source electromagnetic software.

See also

What is the switching frequency of main EV/HEV e-powertrains?