The phrase "propulsion motor" refers to a motor or engine that provides power and force to move or propel something forward, such as a vehicle or a machine. Full definition
In EV Drive, the electric propulsion motor draws its power solely from the batteries, delivering zero - emissions driving. (thetorquereport.com)
The main propulsion motor as mentioned is responsible for adding drive power. (hybridcars.com)
Hybrid Drive — the electric propulsion motor drives the front wheels while the gasoline engine powers a second motor / generator to supplement electrical current drawn from the battery pack. (greencarcongress.com)