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A typical alternator uses permanent magnets mouted on the rotor. Their movement excites the stator of wound coils in the housing. The resulting AC current is rectified and controlled by diodes and a voltage regulator, also typically mounted inside the housing.
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Heart excitation originates in the?
Heart excitation originates in the sino-atrial node.
System charging and warning beep on 92 aerostar?
Check output of the alternator--With voltmeter With engine running readings should be 13.8-14.2 volts lower means probably a bad alternator
What type of ignition system would typically be used in a large garden tractor that has an electric starter motor and headlights?
The same type system used in a car except on a smaller scale. The difference being that the battery will not be charged by an external alternator as in a car but rather by the alternator is located under the flywheel.
Why doesn't your 1992 Lexus SC300 start after changing the alternator fuse?
Clearly there is something wrong with the car besides a bad alternator fuse. Without more information I cannot hazard a guess. But you may want to check the charging system overall to see that it is working correctly. That will include the battery and alternator.
Why does the the engine shut down when the battery cable is removed on your 1993 ford thunderbird?
The alternator is bad. The engine is running off of the battery and when you take the cable off it has no electrical power. If the alternator was working, the car would keep running. Be advised, doing this can damage a healthy alternator. This is not a good way to test the system.
Can ac excitation be used for alternator?
_>'< _
How do you calculate the excitation voltage and current of an alternator?
formals to calculate exciation voltage of alternator
Why The Excitation current is non-sinusoidal when applied voltage is sinusoidal?
excitation voltage is sinusoidal because it is taken from the terminal of alternator but excitation current is non-sinusoidal because it always dc.
What is brushless excitation system?
3 phase synchronous generator or motor require DC current in the rotor. Conventional way of supplying DC requires use of commutators, which requires timely maintenance. To overcome this Brush less Excitation systems is used. Brushless Escitation system consists of one pilot excitor - DC generator with rotating PM as the field and the armature as the stator. The armature of the pilot excitor is connected to the stator of main excitor which is a 3-phase synchronous generator (please do not get confused, this is not our alternator but the exciter for the alternator). The rotor of the main exciter is connected to a diode bridge to get DC. This is connected to the rotor of our alternator.
Where does the voltage that is necessary for field excitation on the rotor originates from?
The excitation current is provided by a small self-excited pilot generator, attached to the same shaft as the alternator's rotor.
For a 3 phase alternator why there is an AC voltage generated in the absence DC excitation?
due to residual magnetism
What is excitation and why is it needed for start up in an AC generator?
An alternator is just another name for a synchronous generator. Excitation is needed to create a magnetic field in the rotor. When to rotor is spun with excitation the magnetic field will cut through the stator field and produce an AC voltage in the stator field. In terms of an alternator with built in rectifier the stators AC voltage in the rectified to DC. The strength of excitation will determine the alternators output voltage. The AVR Automatic Voltage Regulator built into almost every alternator controls field current to maintain a constant output voltage.
Why DC suuply used in Excitation of Alternator?
for torque improvement in armature and create n-pole or s-pole in armature a dc source is used in alternator armature.
Why the rotor of an alternator at rated power dissipates more heat at a low power factor load?
In an alternator, the load current is supplied by the stator and the excitation is applied to the rotor. When the power factor is low (lagging), more excitation is required to maintain rated output voltage at rated current. More excitation is also required to maintain rated output voltage with increased output current. Increased excitation current means increased rotor losses that must be dissipated as heat. (akash)
What is the difference between generator over excitation versus under excitation when attached to the grid?
Over Excitation is a condition when the Excitation System is providing too much field current and as a result, the rotor of the generator will over heat. The Excitation System is equipped with an Over Excitation Limiter. This limiter acts to reduce the Excitation Current if this condition exists Underexcitation is a condition when the generator is not getting enough Excitation Current. If the generator does not get enough Excitation Current, it can be un-synchronized with the grid. We call this slipping a pole. If this occurs, the generator can be severely damaged. Kelly Thompson Engineering Lead Siemens Energy Alpharetta GA
What is a excitation variable?
A variable that causes change in the output of a system. In a RC circuit, for example, the input V is the excitation variable
What voltage is generally used for field excitation?
For a small generator like the 125 Watt Alternator/Generator in your car, 12 Volts at a couple Amps. For a large 1,200,000,000 Power Plant Generator typical excitation is 600V at 8000A.
