Page - 120 - in Hybrid Electric Vehicles

10%. In fact, the ratio of the torque ripple is 7.1% for PMSMOR and 6.2% for SynRM. In the booster mode, the rated torque value of the 10 kW SynRM machine used for ISAB is obviously bigger than that of the 6.5 kW PMSMOR. 4. Conclusions The chapter presents the main steps to be followed in the development of a specific electric drive system dedicated to automotive domain, such as integrated starter-alternator-booster applications. Replacing the starter and alternator in a conventional vehicle with extended possibility to work in booster mode represents the first step of vehicles’ hybridization, called Mild-HEV. In this way, two variants in mounting the ISAB had been identified in the lit- erature: one, directly driven generic called ISAB and another belt-driven called BSAB. In this chapter, the approach contains the major elements that need to be discussed for two type of electrical machine (PMSMOR and SynRM) suitable for BSAB and ISAB, respectively. The general design procedure is presented for these two electrical machines by taking into account the typical constraints of the applications and the behaviour of the machine (thermal, structural, and noise, vibrations and harshness particularities). Also, the control aspects of both electrical machines are presented. Figure 13. ISAB torque profile. Figure 12. BSAB torque profile. Hybrid Electric Vehicles120