**4. Very low voltage and medium power motorisation for electric vehicles**

Many small electric vehicles (boat, kart, motorcycle, quad, cart, utility tricycle, small urban vehicle, unlicensed vehicle...) are equipped with an electrical motorisation with a power ranging from 10 kW to 30 kW. We present in this section a motor architecture optimised to operate at this power level and at very low voltage.

The winding technique for the electric motor is depicted in **Figures 3** and **15**, the slot copper bars are connected to each other at the end-windings via bridges bars located in two planes (crook bar and bow bar). In this case the overhangs are extremely compact. This configuration of the bars corresponds to the case number 1 in **Tables 1** and **2**.

To optimise the manufacturing costs, all motors in this power range will use the same stator laminations, the same number of poles; hence, the number of bars is always the same, only the length of the stator stack is likely to evolve in order to comply with the different specifications, we will be giving two examples.

The motors are assembled in square shaped housing (212x212 mm<sup>2</sup> CSA), as shown in **Figure 16**.

**Figure 15.**

#### **Figure 16.**

*A motor portfolio with a power ranging from 10 kW to 30 kW, operating at very low voltage (courtesy of SMVE performance SAS).*
