Transmission/Gear setup with constant output and variable input?

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Discussion Overview

The discussion revolves around the concept of a device that can maintain a constant output speed while accepting a variable input speed, with a focus on potential applications and examples of such devices. The inquiry includes both speed and torque considerations, with an interest in smaller-scale implementations.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the existence of a device that maintains constant output speed with variable input speed.
  • Another participant seeks clarification on what is meant by "constant" and "variable," specifically asking if it refers to speed or torque.
  • A participant specifies that speed is the primary concern but also expresses interest in torque-related devices.
  • A later reply identifies a Constant Speed Drive (CSD) as an existing solution used in jet engines, explaining its function in maintaining generator speed despite variable engine speeds.
  • The same participant mentions Integrated Drive Generators (IDG) as a newer version that combines the generator and CSD into one unit.
  • One participant clarifies their definition of "small size," indicating a preference for a device comparable to a shoebox rather than a large engine, while noting that high torque is not a requirement.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and interest in the topic, with some agreeing on the existence of devices like CSDs while others seek further clarification on size and application. The discussion does not reach a consensus on specific small-scale solutions.

Contextual Notes

Participants have not fully defined the parameters of "small size" or the specific torque requirements, which may affect the applicability of suggested devices. The discussion remains open-ended regarding the exploration of smaller-scale implementations.

infamous_Q
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is there such a thing as what's mentioned in the subject heading? Preferably a small device would be wanted...

Thanx!
 
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What's meant by constant and variable? Speed? Torque?
 
well speed primarily, but information on a device that has the constant/variable setup with torque would be useful also.
 
Yes there is. It is called a CSD, or Constant Speed Drive. They are used on jet engines. The main aircraft generators are driven off of the engines accessory gear drive. When the engine changes speeds due to operating requirements (i.e. takeoff vs cruise speed) the generator must maintain the same speed. That is where the CSD comes in. There are newer versions also called IDG for Integrated Drive Generator which is the same thing essentially excapet the generator and CSD are combined into one single unit. You can look these up for information on their principles of operation to give you ideas.

What do you mean when you say "small size?"
 
thanks for the help!

and by small size i mean definitely not a jet engine lol, and more along the lines of a shoe box perhaps. but it would not be for an huge amount of torque.
 

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