Exam Question
(a) (i) Describe the characteristics of a d.c. motor (4)
(ii) Explain the advantages of such a motor for deck machinery (4)
(b) Describe with the aid of a sketch a control system for the motor in (a)
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📅 Oct 2024
Reference Answer
(a) (i) Characteristics of a D.C. Motor
High Starting Torque: A d.c. motor can develop a very high torque from zero speed, making it suitable for starting heavy, stationary loads.
Wide and Stepless Speed Control: Speed can be smoothly regulated by varying the armature voltage or field current, allowing precise acceleration and deceleration.
Constant Torque Capability: The motor delivers nearly constant torque over a wide speed range, making it stable under varying load conditions.
High Starting Torque: A d.c. motor can develop a very high torque from zero speed, making it suitable for starting heavy, stationary loads.
Wide and Stepless Speed Control: Speed can be smoothly regulated by varying the armature voltage or field current, allowing precise acceleration and deceleration.
Constant Torque Capability: The motor delivers nearly constant torque over a wide speed range, making it stable under varying load conditions.
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