Exam Question
With reference to a 3 speed a.c. cage motor driven cargo winch:
(a) Sketch a circuit diagram for a pole change motor. (8)
(b) Describe how speed change and braking are achieved. (8)
ETO
ETO Exam papers
📅 Aug 2023
Reference Answer
(a) Circuit diagram for a pole change motor:
(b) Speed Change and Braking Mechanism:
Speed Change:
The synchronous speed of an induction motor is governed by the formula:
(b) Speed Change and Braking Mechanism:
Speed Change:
The synchronous speed of an induction motor is governed by the formula:
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