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An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current is
- a)60 Hz
- b)120 Hz
- c)180 Hz
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
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An eight pole wound rotor induction motor operating on 60 Hz supply is...
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Frequency of Rotor Current in an Eight Pole Wound Rotor Induction Motor
- The synchronous speed of an eight pole induction motor operating on 60 Hz supply is 1800 rpm. This means that the revolving magnetic field rotates at a speed of 1800 rpm.
- In a wound rotor induction motor, the rotor windings are connected to slip rings, and external resistors or reactances are connected to these slip rings. The rotor circuit forms a closed circuit, and the current flows through it due to the relative motion between the rotor and the stator magnetic fields.
- The frequency of the rotor current is given by the slip frequency formula:
f_r = (s * f_s) / p
where f_r is the frequency of the rotor current, f_s is the frequency of the supply voltage, p is the number of poles, and s is the slip.
- In this case, the number of poles is 8, the frequency of the supply voltage is 60 Hz, and the synchronous speed is 1800 rpm. The slip is given by:
s = (n_s - n_r) / n_s
where n_s is the synchronous speed and n_r is the rotor speed.
- As the prime mover is driving the rotor in the opposite direction of the revolving magnetic field, the rotor speed is:
n_r = n_s - 1800 rpm
- Substituting the values in the slip equation, we get:
s = (n_s - n_r) / n_s = 1800 / 1800 = 1
- Therefore, the frequency of the rotor current is:
f_r = (s * f_s) / p = (1 * 60 Hz) / 8 = 7.5 Hz
- However, the rotor circuit may have external resistors or reactances connected to it. These components affect the impedance of the rotor circuit and the current flowing through it. The actual frequency of the rotor current may be different from the calculated value.
- The synchronous speed of an eight pole induction motor operating on 60 Hz supply is 1800 rpm. This means that the revolving magnetic field rotates at a speed of 1800 rpm.
- In a wound rotor induction motor, the rotor windings are connected to slip rings, and external resistors or reactances are connected to these slip rings. The rotor circuit forms a closed circuit, and the current flows through it due to the relative motion between the rotor and the stator magnetic fields.
- The frequency of the rotor current is given by the slip frequency formula:
f_r = (s * f_s) / p
where f_r is the frequency of the rotor current, f_s is the frequency of the supply voltage, p is the number of poles, and s is the slip.
- In this case, the number of poles is 8, the frequency of the supply voltage is 60 Hz, and the synchronous speed is 1800 rpm. The slip is given by:
s = (n_s - n_r) / n_s
where n_s is the synchronous speed and n_r is the rotor speed.
- As the prime mover is driving the rotor in the opposite direction of the revolving magnetic field, the rotor speed is:
n_r = n_s - 1800 rpm
- Substituting the values in the slip equation, we get:
s = (n_s - n_r) / n_s = 1800 / 1800 = 1
- Therefore, the frequency of the rotor current is:
f_r = (s * f_s) / p = (1 * 60 Hz) / 8 = 7.5 Hz
- However, the rotor circuit may have external resistors or reactances connected to it. These components affect the impedance of the rotor circuit and the current flowing through it. The actual frequency of the rotor current may be different from the calculated value.
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An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer?
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An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer?.
An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800rpm, by a prime mover in the opposite direction of revolving magnetic field. The frequency ofrotor current isa)60 Hzb)120 Hzc)180 Hzd)none of the aboveCorrect answer is option 'C'. Can you explain this answer?.
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