Motor-Generator

The area outlined in green is the motor/generator (IMA motor). The electrical connector is for the three commutation sensors that detect the position of the rotor. The Insight has a three-cylinder gasoline engine, and three-cylinder engines tend to vibrate quite a bit, especially at idle. Many engines use a counterweight on a shaft connected to the timing belt to cancel out the vibration. The Insight uses the IMA motor to cancel out the vibration by pulsing the IMA motor opposite the inertia of the engine. In order to do this, the MCM (motor control module) must know exactly where the engine is in its revolution.