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If a two-pole alternator creates one cycle of voltage in one second (or one hertz of frequency), a four pole alternator will create two cycles of voltage in one second (or two hertz). The frequency of an alternator is directly proportional to the number of poles in the alternator.
How do poles determine response?
Poles are frequencies near which the magnitude of transfer function actually shoots up to hypothetically to infinity. Zeros are frequencies at which the response magnitude becomes zero. Poles determine the transient response of the system, while the zero determines the speed of response to be more general.
What is meant by pole frequency?
“A pole frequency is that frequency at which the transfer function of a system approaches infinity” And similarly “A Zero frequency is that frequency at which the transfer function of a system approaches Zero”
Is frequency directly proportional to time period?
Sound | Short/Long Answer Questions The number of times a cycle is completed in a second is the frequency. The time taken to complete one vibration is called time period. Frequency and time period is inversely proportional, the number of vibrations per second is frequency.
When is a low frequency pole a dominant pole?
• A Dominant Pole exists if one of the low frequency poles is much larger than the others. – In the graph below case ω = 1000 rad/sec is a dominant pole. All other poles and zeros are at low enough frequencies that they do not affect the lower cutoff frequency ω
If ω is multiplied by 10, then the amplitude will decrease by a factor of 10, which is 20dB, and so you get -20dB/decade. You can make the same approximation for the phase of the transfer function. A Left-Half Plane pole will add 90 degrees phase shift as you increase ω beyond the pole frequency. The same reasoning applies to LHP zeros (eg.
How does a zero affect the phase response of an amplifier?
However when dealing with transfer function for an amplifier, a zero depending on right hand or left hand may decrease or increase phase, introduces +20 db/decade in gain and similarly for a pole (left hand for stability), decreases the phase response and introduces -20 db/decade in gain.
Which is an example of a lower cutoff frequency?
Lower Cutoff Frequency Calculations If there is no dominant pole at low frequencies, the poles and zeros interact to determine the lower cutoff frequency ω L For example, suppose: A L (s)=A