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Let a rotating machine have following:
Frequency (f); Speed of Motor (N); No. of Poles (P)
N= (120*f)/P
From above
Speed N is
directly proportional to frequency f
indirectly proportional to number no. poles P
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How do you control rpm of single phase motor without using variable frequency drive?
By changing the voltage through a potentiometer ( eg fan regulator )
When you rotate the handle of the electric generator faster does it deliver more less or the same voltage?
The speed of a generator only effects the frequency. Most generators operate at 1800 RPM. The output voltage is controlled by varying the field excitation voltage.
What is the RPM for ac generator to get 240 volt?
'Speed' is only one of the factors that determine the output voltage of an a.c. generator, so your question cannot be answered. In practise, speed is more important establishing frequency rather than voltage.
Does load affects fuel consumption per hour of a diesel generator?
If the generator is to maintain the same rpm and power output, then a heavier load will increase the diesel consumption. The revolutions per minute the generator runs will increase as the load increases, thereby resulting in an increase in diesel consumption to maintain the high rpm. A Generator has a governor which attempts to maintain frequency at 60 Hz for North America. For the generator to increase the power output at the same frequency, the governor will increase the fuel and air to the engine. The fuel consumption will not be linear because of the curves associated with the particular engine. The fuel to KWH is know as the heat rate curve for the generator.
What method can be used to increase the rate of delivery of a rotary gear type pump?
increase the rpm
How do you control rpm of single phase motor without using variable frequency drive?
By changing the voltage through a potentiometer ( eg fan regulator )
How to control motor rpm?
For AC motor, you can change motor RPM by changing its supply voltage or by changing supply frequency. For DC motor, you can change motor speed by controlling armatyre voltage or field current.
Why do your lights dim when your RPM decreases?
Because the voltage drops. Depending on what is the problem changing the battery or alternator will help.
Relate the frequency of the generated voltage to the speed of the machine and the number of poles?
N=120f/P where N - number of rotations in rpm f - frequency in Hz and P - number of poles
What is the fuel injector solenoid energized by?
Fuel injector is energize by signal composed of pulsed voltage frequency increases as with rpm set by pcm
When you rotate the handle of the electric generator faster does it deliver more less or the same voltage?
The speed of a generator only effects the frequency. Most generators operate at 1800 RPM. The output voltage is controlled by varying the field excitation voltage.
How frequency is controlled in a grid?
The frequency is determined by the operational speed of the generators in the power plant and is very closely related to the RPM of the generators (it might only differ in a constant multiplier).Depending on the load of the grid a proper torque must be applied on the generators to generate voltage with the proper frequency. Once the AC is out in the grid its frequency is much less prone to environmental effects than its voltage.
What is the value of 2000 g in RPM in centrifuge?
It depends on the radius of the centrifuge. a=R x (angular frequency)^2 The units of angular frequency are radians/second, you want rpm If the rpm is 1 rpm the the angular frequency is 2pi *60 radians/sec
How gearing down works?
Gearing down works by changing the gear ratio on the transmission, transfer case, or differential. It increases the RPM of the input while reducing the output RPM to increase power.
Why are ac generators loaded after reaching full speed?
If the load was connected as the speed was increasing it would not be operating on its proper frequency. Also as the RPM is increasing so is the output voltage.
Is it feasible to parallel the dissimilar rating generators?
yes,but the two dismaler generators should have the following similarity; 1]same voltage rating 2]same frequency 3]same rpm.
Convert 480 volt 60 hz to 380 volt 50 hz generator for international service?
1) Changing Engine Speed to Vary Output FrequencyPresent-day generators consist of an engine directly connected to an alternator to produce electricity. One of the most common ways of changing the output frequency of a generator is to change the rotation speed of the engine.The two factors are related as per the following formula -Generator Frequency (f) = Number of revolutions per minute of the engine (N) * Number of magnetic poles (P) / 120Conversely, P = 120*f/NAs per the above formulae, a 2-pole generator producing an output frequency of 60 Hz has an engine speed of 3,600 rpm. To change the output frequency to 60 Hz for the same generator configuration, the engine speed needs to be reduced to 3,000 rpm. Similarly, for a 4-pole generator, an engine speed of 1,800 rpm produces output of 60 Hz. Reducing the engine speed to 1,500 rpm yields an output of 50 Hz.In the case of small or residential generators, you can alter the engine rpm settings by making a few changes on the control panel of your unit. Follow the steps given below to alter your generator frequency from 60 Hz to 50 Hz:(a) Run your generator engine and tune the frequency meter on your control panel to read 50 Hz.(b) Check the AC voltmeter or potentiometer as the case may be and read the voltage output of the generator. The output voltage decreases as you reduce the frequency and may be lower than the desired value.(c) Adjust the AC voltmeter or potentiometer on your control panel till you obtain the desired output voltage at 50 Hz.(d) By making similar modifications on the control panel, you can increase the frequency from 50 Hz to 60 Hz.(e) If the control panel does not display the frequency, you will need to first connect a device that will measure the frequency while the generator is in operation and then change the engine rpm.Generator controller units undertake real-time monitoring and control of your unit. Built-in protective functions automatically shut down your generator in the case of excess engine rpm or very low output frequency. For addtional information on the functionality of a generator please read the following article, How Generators Work.
