Why Use Transorbs Instead of Diodes in a Generator Rotor Circuit?

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Discussion Overview

The discussion revolves around the use of transorbs versus diodes in the rotor circuit of capacitor-controlled generators. Participants explore the reasons for choosing one component over the other, considering the implications for circuit reliability and performance.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions the rationale behind using transorbs instead of diodes in the rotor circuit, suggesting that diodes are typically expected in this application.
  • Another participant explains that transorbs can limit high voltage spikes generated by commutator or brush noise, thereby enhancing reliability, and notes that the voltage rating of the transorb should exceed the rotor voltage.
  • A different participant comments on the maintenance challenges associated with older commutator and brush systems, mentioning that while high voltage spikes occur, insulation breakdowns are rare.
  • Several participants assert that previous responses are irrelevant, clarifying that capacitor-controlled generators do not utilize brushes or commutators, and express confusion about the specific type of generator being discussed.
  • One participant requests further clarification on the nature of the generator, asking whether it is an induction generator or a brushless marine generator, and whether it generates AC or DC.
  • Another participant expresses skepticism about the existence of "capacitor controlled generators" and suggests that if the focus is on the application of DC and AC TVS, basic explanations are available elsewhere.

Areas of Agreement / Disagreement

Participants generally disagree on the relevance of previous answers and the specifics of capacitor-controlled generators, indicating a lack of consensus on the topic.

Contextual Notes

There are unresolved questions regarding the specific type of generator being referenced, as well as the assumptions underlying the use of transorbs versus diodes in this context.

OddBod
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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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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.
 
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
 
Neither of the answers have any relevance to the question in that capacitor controlled generators do not have brushes or commutators
 
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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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.
 

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