The integrated starter-generator (ISG) replaces both the conventional starter and alternator (generator) of an automobile in a single electric device.

The ISG requires contrary specifications, i.e. a high starting torque and a field-weakening capability in a wide speed range, therefore its design is a challenging job.

The integrated-starter-generator (ISG) is an important device for hybrid electric vehicles (HEVs), which replaces the conventional starter motor and the generator.