Class 2 (2nd Engineer) MET 📅 Oct 2022

Exam Question

Compare methods of obtaining speed regulation of three-phase induction motors generally used in tankers by means of:

(a) Rotor resistance

(b) Cascade system

Give examples where each system may be employed with advantage.

Reference Answer

Three main methods of speed regulation for three-phase induction motors used on tankers are rotor resistance , cascade system , and pole-changing .
Each method operates on a different principle and is suited to particular shipboard applications depending on the load, torque, and speed control requirements.
(a) Rotor Resistance Method
Principle:

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