🔍 Key Concepts

• Wound-rotor induction motor construction: which part is the stator and which part is the rotor in the illustration • How slip rings and brushes are used to connect external resistances to the rotor circuit • Typical labeling of line (stator) terminals versus rotor terminals in motor diagrams (T1–T3 vs M1–M3)

💭 Think About

• On the picture, trace where T1, T2, and T3 go: do they connect to the incoming three-phase lines (L1, L2, L3) or to the rheostat? • Similarly, trace where M1, M2, and M3 go: are they associated with the slip rings/brushes on the rotor or with the fixed stator windings? • Ask yourself: which windings must be stationary to connect directly to the ship’s power circuit breaker, and which windings need slip rings to reach moving parts?

✅ Before You Answer

• Verify which leads (T or M) are drawn going to the circuit breaker and line terminals L1, L2, L3 – those must be the stator leads. • Verify which leads are shown going to the rheostat for speed control through slip rings and brushes – those must be the rotor leads. • Confirm from the drawing that slip rings are mounted on the rotor shaft, so any leads attached to them cannot be the fixed stator connections.