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generators work by rotating a magnetic field thru a wire shell or by rotating wire thru a stationary magnetic field (think of a small DC motor with magnets around the shell) since large generators dont have magnets in them (its not very efficent)you have to send a flowing current thru the rotating coils to produce the magnetic field. this induces current in the stator and you have a generator..of course the same effect is produced by inducing a current in the stator and pulling the output from the rotor.
What else can I help you with?
What is under excitation in synchronous motor?
DONT KNOW AN OF THEM 10/4 over & out
What are the major causes of loss of excitation on generators?
The major causes of loss of excitation on generators are due to an open circuit or a short circuit in the field winding. This may also be caused by a breakdown of the insulation system.
What is synchronous impedance?
Synchronous impedance is also known as the EMF method. It is a ratio of open circuits to short circuits, when they both are referred to the same field excitation.
What is the formula for excitation voltage?
E=Vt + Ia jXS Where E excitation voltage Vt Terminal voltage Stator Current Ia Xs synchronous Reactance
What is a synchronous generator?
Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines and hydro turbines into electrical power for the grid. (OR) A "synchronous" generator runs at a constant speed and draws its excitation from a power source external or independent of the load or transmission network it is supplying. A synchronous generator has an exciter that enables the synchronous generator to produce its own " reactive" power and to also regulate its voltage. Synchronous generators can operate in parallel with the utility or in "stand-alone" or "island" mode. Synchronous generators require a speed reduction gear
Difference between static excitation system?
It is called static excitation when you make use of solid state components like diode and thyristors to convert to pure dc and to use this dc for field excitation of synchronous generators. The field winding of synchronous generators can be excited by dc source only. It is called brushless excitation because use of carbon brushes are not made here.It is called dynamic excitation is when you make use of rotating brushes. Excitation is necessary to produce reactive power and also to regulate the voltage of synchronous generators.
Is reluctance motor is a synchronous motor with dc excitation?
yes
Which excitation synchronous motor drawn reactive power?
Hi, Under excitation - inductive reactive power Over excitation - Capacitive reactive power.
What is under excitation in synchronous motor?
DONT KNOW AN OF THEM 10/4 over & out
Which type of generator is used in windmills?
Synchronous generators
What is over excitation of field windings?
Over-excitation of field windings refers to a condition in synchronous machines, such as generators, where the field current exceeds the rated value, leading to an excessive magnetic field. This can result in increased voltage output and potential overheating of the machine. Prolonged over-excitation can damage the windings and other components due to overheating and insulation breakdown. It is critical to monitor and control the excitation levels to maintain safe and efficient operation.
What will happen if excitation of a running synchronous motor suddenly cuts off?
something cool
What are the major causes of loss of excitation on generators?
The major causes of loss of excitation on generators are due to an open circuit or a short circuit in the field winding. This may also be caused by a breakdown of the insulation system.
What is synchronous impedance?
Synchronous impedance is also known as the EMF method. It is a ratio of open circuits to short circuits, when they both are referred to the same field excitation.
What is the formula for excitation voltage?
E=Vt + Ia jXS Where E excitation voltage Vt Terminal voltage Stator Current Ia Xs synchronous Reactance
In synchronous motor theory is excitation current the same as field current?
Yes, in synchronous motor theory, excitation current is the same as field current. This current is used to produce the magnetic field in the rotor that interacts with the stator current to generate torque and make the motor operate synchronously.
What has the author John Griffiths Barry written?
John Griffiths Barry has written: 'Some effects of variable excitation on synchronous motor oscillation ..' -- subject(s): Synchronous Electric motors
