Starter Generator

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The starter generator, sometimes referred to as the motor generator unit (MGU), is a serviceable 16-pole, permanent magnet, enhanced Lundell AC machine. This device not only serves as a 36-volt AC generator, it is also used to provide engine power assist and to start the engine following hybrid "autostops". 36-volt AC power flows between the starter generator and the generator control module through a 3-phase cable assembly.

As a generator, the starter-generator provides up to 3 KW of AC power to the generator control module power inverter. Field current is provided by the generator control module through a 7-pin connector, and starter generator RPM feedback is transmitted back to the controller through the same connector. Starter generator temperature data is provided to the generator control module through a separate 3-pin connector.

As a motor, the machine provides up to 65 N.m of torque for power assist and engine starting. The motor receives 3-phase AC power from the power inverter within the generator control module.