Transorbs in a generator rotor

In summary, capacitors are better than diodes when it comes to suppressing noise in a generator circuit.
  • #1
OddBod
2
1
is there some special reason why transorbs would be inserted into the rotor circuit of a capacitor controlled generator, rather than diodes? And since I have no way of determining the value of the existing transorbs, could I simply substitute diodes.
Diodes are the "normally" expected component in this position, with a shunt resistor across them.
 
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  • #2
Commutator or brush noise interrupts the inductive circuit and generates high voltage spikes that can break down the rotor winding insulation. A transorb will limit the voltage of those noise spikes and so increase reliability. The voltage rating of the transorb should be greater than the rotor voltage.
 
  • #3
The solution with brushes and commutator is old and requires more maintenance than other methods used today. The brushes generate HVHF spikes, especially after being in longer service, but breakdowns of the winding insulation are/were rare due to such stress
 
  • #4
Neither of the answers have any relevance to the question in that capacitor controlled generators do not have brushes or commutators
 
  • #5
OddBod said:
Neither of the answers have any relevance to the question in that capacitor controlled generators do not have brushes or commutators
If only the world was that simple.
“Capacitor controlled generator” is an insufficient description.
I'm sorry but my mind reading is still not fully functional.

Is it an induction generator that uses capacitors to excite and set the output frequency?
Is it a brushless marine generator that has two armatures, normally with diodes between the armatures?
Does it generate AC or DC?
Please give us a link to the type of generator you ask about.
 
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Likes anorlunda and hutchphd
  • #6
OddBod said:
Neither of the answers have any relevance to the question in that capacitor controlled generators do not have brushes or commutators
Never heard of "capacitor controlled generators"... Do they grow in the woods?
Anyway, if you're just interested in application of DC TVS and AC TVS , the basics are explained here
Have a nice day.
 

1. What are Transorbs in a generator rotor?

Transorbs are devices used in generator rotors to protect them from overvoltages and voltage spikes. They are designed to absorb and dissipate the excess energy, preventing damage to the rotor and other components.

2. How do Transorbs work in a generator rotor?

Transorbs are made of a material called metal oxide varistor (MOV) which has a high resistance at normal voltage levels. However, when a voltage spike occurs, the resistance decreases, allowing the excess energy to be diverted through the Transorb and away from the rotor.

3. Why are Transorbs important in a generator rotor?

Generator rotors are expensive and critical components in power generation systems. Transorbs provide protection against voltage spikes that can cause damage to the rotor windings, resulting in costly repairs and downtime.

4. How are Transorbs installed in a generator rotor?

Transorbs are typically connected in parallel with the rotor windings. They can be installed during the manufacturing process or retrofitted into existing generators.

5. Do Transorbs have a lifespan in a generator rotor?

Yes, Transorbs have a limited lifespan and will need to be replaced periodically. The lifespan can vary depending on the operating conditions and the number of voltage spikes the generator experiences.

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