🔍 Key Concepts

• Synchronous generator acting as a motor ("motoring" or "motorization") • Effect of a motoring generator on the prime mover (diesel/turbine) and the electrical bus • What actually happens to power flow and mechanical torque when a generator is accidentally driven by the system

💭 Think About

• When a generator is correctly on the line, is it supplying power to the bus or taking power from it? What changes during motorization? • Think about the shaft: if the generator begins to act like a motor, what will it try to do to the attached engine or turbine? Reverse its direction, or drive it in the same direction? • In AC shipboard alternators, is there usually a commutator that can be damaged, or is the construction different from a DC machine?

✅ Before You Answer

• Identify whether reversal of rotation actually occurs in typical motoring incidents, or whether the speed/torque changes in another way • Confirm whether a ship’s AC generator normally has a commutator or slip rings • Decide whether the most serious concern during motorization is mechanical stress on the prime mover, excessive electrical loading of the bus, or some other specific effect