Exam Question
(a) What is a direct connected alternator (8)
(b) What is the difference between direct connected and direct coupled units. (8)
Class 4 (4th Engineer)
MET
📅 Apr 2023
Reference Answer
### (a) Direct Connected Alternator
A direct connected alternator is an electrical generator configuration where the alternator's rotor is rigidly mounted on the same shaft as the prime mover's crankshaft, effectively forming a single, continuous rotating assembly. There are no intermediate couplings, gears, or belts between the engine and the alternator.
**Key Characteristics:**
1. **Shared Shaft:** The engine crankshaft and the alternator rotor are mechanically one unit or are so rigidly connected that they function as one. The alternator is often flange-mounted directly to the engine flywheel housing.
A direct connected alternator is an electrical generator configuration where the alternator's rotor is rigidly mounted on the same shaft as the prime mover's crankshaft, effectively forming a single, continuous rotating assembly. There are no intermediate couplings, gears, or belts between the engine and the alternator.
**Key Characteristics:**
1. **Shared Shaft:** The engine crankshaft and the alternator rotor are mechanically one unit or are so rigidly connected that they function as one. The alternator is often flange-mounted directly to the engine flywheel housing.
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