**6. Conclusion**

424 Induction Motors – Modelling and Control

**Table 8.** FTP-75 energy performances

**Figure 27.** Drive-Cycles energy consumptions [kJ]

**Figure 26.** FTP-75 drive cycle points over LMA efficiency curve gain

0.05

0.1

0.1

0.305.29

0.2


0.01

0 1

0.35

0.2

0.01

0 05

T [N.m]

losses for each simulated drive cycle, with and without LMA.

Eu Eab (LMA) Eab (without LMA)

Without

Eu (kJ) 1716 1716 Eab (kJ) 1941 1910 Motor losses (kJ) 225,1 194,6 Energy efficiency (%) 88,4 89,8

LMA

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

speed [rpm]

0.01

LMA - CF

0.05

0.01

Figures 27 and 28 present, respectively, induction motor energy consumption, efficiency and

**Europe:City 11-Mode (Japan) ECE-R15 FTP-75 <sup>0</sup>**

 With LMA

cycle points LMA eff. gains motor limits

> Induction motor drives for EVs are submitted to a large set of working conditions, quite different from rated ones. Motor energy saving is fundamental for improving EVs performances. Under the loss model based approach previously discussed (LMA), a set of simulation results was presented in this book chapter, aiming to improve the induction motor energy performance. Different standard driving cycle scenarios were considered in order to evaluate the chosen LMA features: compared to conventional flux regulation, the major improvements in motor efficiency are for low load torque, particularly for relative low speeds. These are the motor working points where its efficiency is tipically lower, which is an interesting LMA feature. This is in agreement to the fact that LMA action has a more significative impact on ECE-R15 and Europe:city efficiencies, as explained through figures 15,17 and 18, 20 analysis.

> Due to LMA impact on iron losses (function of Id), a possibility to be considered in future works is the impact of LMA on motors with higher power rates and/or high efficiency level motors, where the relative weights of iron and copper losses are different.
