Author details

1: Introduce the desired performances (power, rated speed)

3: Start electro-magnetic pre-design process

5: while stop criterion is not achieved do

124 New Trends in Electrical Vehicle Powertrains

7: Estimate Cmec according to Figure 2

9: Estimate number of turns in series Nph (3) 10: Calculates the number of conductors in slot (8)

13: Chose the number of flux barriers (22) 14: Calculates the position of the barriers (23) Calculation of rotor in q-axis (Figure 9) 15: while stop criterion is not achieved do

20: while stop criterion is not achieved do

22: Calculates the width of the barriers in d-axis(42–43)

28: Calculates motor performances: Torque (53), output power (54)

factor, peak air gap flux density (using the d-flux from magnetic model). 30: Evaluates stop criterion (error of estimated parameters)

29: Calculates the estimated values: Back EMF (52), efficiency (57), power factor, saturation

Due to the harsh operating conditions, electric vehicles require highly reliable and resilient electric motors. To this end, rare-earth-free PMaSynRMs are appealing candidates. In this chapter, a design procedure of PMaSynRMs has been presented, which includes electromagnetic, thermal, and mechanical restrictions in order to ensure a reliable and resilient operation within extended operational limits. For example, in the event of a major demagnetization failure, the PMaSynRM designed following the proposed approach is able to work as a synchronous reluctance machine, thus providing about 75% of the rated torque. In addition, the use of ferrite magnets allows the machine to operate in higher temperature environments.

25: Solve Magnetic model (Figure 12 and Figure 13) 26: Calculates Inductances, magnetic flux linkage (51)

32: Calculates the thickness of the radial ribs (58–59)

16: Define hrotor

21: Define kinsd

19: end

(Figure 10)

24: end

31:end

18: Evaluates stop criterion

Calculation of rotor in d-axis

23: Evaluates stop criterion

27: Calculates losses (55–56)

7. Conclusions

2: Introduce the fixed parameters (pole pairs, phase number, slots, Bus DC)

4: Estimate parameters (efficiency, power factor, back EMF, saturation factor)

6: Basic parameters calculation: Electric power (1), phase current (2)

8: Calculate Dis and leff using (4) and (5). Compute the g (7) and Lstk (6)

11: Calculates the number of turns in series Nph new (9) and the Bg (10) 12: Calculates the stator geometry (teeth, yoke, and slots dimensions) (11–21)

17: Calculates the width of the segments and barriers (25–30) and (31–32)

Carlos López-Torres\*, Antoni Garcia-Espinosa and Jordi-Roger Riba

\*Address all correspondence to: carlos.lopez.torres@upc.edu

Electrical Engineering, Universitat Politècnica de Catalunya (UPC), Terrassa, Spain
