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The power factor of a synchronous motor
- a)improves with increase in excitation and may even become leading at high excitations
- b)decreases with increase in excitation
- c)is independent of its excitation
- d)increases with loading for a given excitation
Correct answer is option 'A'. Can you explain this answer?
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The power factor of a synchronous motora)improves with increase in exc...
Refer, inverted V-curves related to V-curves.
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Power Factor of a Synchronous Motor
The power factor of a synchronous motor is a measure of how effectively the motor converts electrical power into mechanical power. It is defined as the cosine of the angle between the voltage and current waveforms. A power factor of 1 indicates that the motor is using power efficiently, while a power factor less than 1 indicates that the motor is drawing reactive power from the system.
Effect of Excitation on Power Factor
The excitation of a synchronous motor refers to the magnetic field produced by the rotor. The power factor of a synchronous motor improves with an increase in excitation and may even become leading at high excitations. This means that the motor can supply reactive power to the system, reducing the overall reactive power demand. The power factor improvement is due to the increased magnetizing current, which leads to a more efficient conversion of electrical power into mechanical power.
Effect of Loading on Power Factor
The power factor of a synchronous motor also increases with loading for a given excitation. As the motor is loaded, the mechanical power output increases, causing the power factor to improve. This is because the motor draws more current and the angle between the voltage and current waveforms decreases, resulting in a higher power factor. Therefore, the power factor of a synchronous motor is not only dependent on its excitation but also on the level of loading.
Summary
In summary, the power factor of a synchronous motor improves with an increase in excitation and may even become leading at high excitations. It also increases with loading for a given excitation. This is because the increased excitation and loading result in a higher magnetizing current and a decrease in the angle between the voltage and current waveforms, leading to a more efficient conversion of electrical power into mechanical power.
The power factor of a synchronous motor is a measure of how effectively the motor converts electrical power into mechanical power. It is defined as the cosine of the angle between the voltage and current waveforms. A power factor of 1 indicates that the motor is using power efficiently, while a power factor less than 1 indicates that the motor is drawing reactive power from the system.
Effect of Excitation on Power Factor
The excitation of a synchronous motor refers to the magnetic field produced by the rotor. The power factor of a synchronous motor improves with an increase in excitation and may even become leading at high excitations. This means that the motor can supply reactive power to the system, reducing the overall reactive power demand. The power factor improvement is due to the increased magnetizing current, which leads to a more efficient conversion of electrical power into mechanical power.
Effect of Loading on Power Factor
The power factor of a synchronous motor also increases with loading for a given excitation. As the motor is loaded, the mechanical power output increases, causing the power factor to improve. This is because the motor draws more current and the angle between the voltage and current waveforms decreases, resulting in a higher power factor. Therefore, the power factor of a synchronous motor is not only dependent on its excitation but also on the level of loading.
Summary
In summary, the power factor of a synchronous motor improves with an increase in excitation and may even become leading at high excitations. It also increases with loading for a given excitation. This is because the increased excitation and loading result in a higher magnetizing current and a decrease in the angle between the voltage and current waveforms, leading to a more efficient conversion of electrical power into mechanical power.
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The power factor of a synchronous motora)improves with increase in excitation and may even become leading at high excitationsb)decreases with increase in excitationc)is independent of its excitationd)increases with loading for a given excitationCorrect answer is option 'A'. Can you explain this answer?
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