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 36 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.
| Brand | Model | Type | Slot/pole | Skew | Phase number |
| Audi | e-Tron 55 quattro | SCIM | 48s58r4p | ? | 3 |
| BMW | i3 | IPMSM | 72s12p | no | 3 |
| BMW | ix3 | WRSM | 54s6p | no | 3 |
| GM | ChevyBolt | IPMSM | 72s12p | 2-step rotor linear skew | 3 |
| Ford | Mach-e | IPMSM (rear) | 48s8p | 4-step rotor linear skew | 3 |
| Honda | Accord | SPMSM | 24s16p | no | 3 |
| Hyundai | Ionic | IPMSM | 48s8p | ? | 3 |
| Jaguar | i-Pace EV400 S | IPMSM | 48s8p | ? | 3 |
| Mercedes | EQC 400 4MATIC | SCIM | ? | ? | 3 |
| Mercedes | EQS | IPMSM | 48s8p | ? | 3 |
| Mitsubishi | Outlander | IPMSM | ? | ? | 2×3 ? |
| Nissan | Leaf | IPMSM | 48s8p | 2-step rotor linear skew | 3 |
| Opel | Ampera | IPMSM | 72s12p | 2-step rotor linear skew | 3 |
| Porsche | Taycan | IPMSM | 48s8p | ? | 3 |
| Renault | Twizy | SCIM | 36s48r4p | ? | 3 |
| Renault | Zoe | WRSM | 48s8p | no | 3 |
| Smart | ForTwo | PMSM | 36s12p | ? | 3 |
| Tesla | S | SCIM | 60s74r4p | ? | 3 |
| Tesla | 3 | SCIM (rear) | 60s74r4p | ? | 3 |
| Tesla | 3 | IPMSM (front) | 54s6p | 4-step rotor V-skew | 3 |
| Tesla | X | SCIM | 60s74r4p | ? | 3 |
| Tesla | Y | IPMSM | 54s6p | ? | 3 |
| Toyota | Prius 2004 | IPMSM | 48s8p | no | 3 |
| VW | e-up | IPMSM | 60s? | ? | 3 |
| VW | ID4 | IPMSM | 48s8p | 4-step rotor linear skew | 3 |
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?