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Refer to FIGURE 4.1 below and answer the questions that follow - NSC Electrical Technology Power Systems - Question 4 - 2017 - Paper 1
Question 4
Refer to FIGURE 4.1 below and answer the questions that follow. 4.1.1 Name any TWO parts of the motor in FIGURE 4.1. 4.1.2 Explain how the direction of rotation of... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 4.1 below and answer the questions that follow - NSC Electrical Technology Power Systems - Question 4 - 2017 - Paper 1
Step 1
Step 2
4.1.2 Explain how the direction of rotation of this motor may be reversed.
Answer
The direction of rotation of the motor can be reversed by swapping any two of the three connected phases. This alteration changes the sequence of the magnetic field, thereby reversing the direction in which the rotor turns.
Step 3
4.1.3 Explain which connection would develop the greatest torque.
Answer
The delta connection will develop greater torque compared to the star connection. In a delta configuration, the full line voltage is applied to each winding, resulting in a higher current and consequently stronger magnetic fields. This increased magnetic interaction leads to a higher torque output.
Step 4
4.2 State ONE advantage of a three-phase induction motor over a single-phase induction motor.
Answer
One significant advantage of a three-phase induction motor is that it requires less maintenance than a single-phase motor, as it has fewer starting issues and operates more efficiently at various loads.