Low RPM motor propelling a highway vehicle

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Discussion Overview

The discussion revolves around the engineering considerations of using a low RPM, high torque motor to propel a highway vehicle, specifically the implications of gearing up to achieve a higher RPM for final drive. The scope includes theoretical engineering analysis and practical application in vehicle design.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that gearing up a 100 RPM motor to achieve 1000 RPM is feasible but may present challenges.
  • One participant notes that operating at low RPM would necessitate a complex gearing system to provide a reasonable speed range.
  • Another participant mentions that while diesel engines are commonly used in trucks due to their low RPM torque characteristics, there are concerns about frictional power loss and engine life that influence the suitability of such configurations.
  • Bill clarifies that sufficient torque is assumed to allow for a standing start without the need for downshifting, similar to steam engines or electric motors.

Areas of Agreement / Disagreement

Participants express differing views on the practicality and engineering implications of using a low RPM motor for vehicle propulsion, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants have not fully explored the assumptions regarding torque availability and the specific engineering constraints that may arise from using such a motor configuration.

wmingin
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Good Morning All!

Is it considered poor engineering to gear up a 100 RPM high torque motor
to achieve a 1000 RPM medium torque final drive?

What would be the major drawbacks?

Thanks!

Bill
 
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Could be done no problem.

Would be a pain to drive as you don't have much rpm to play with and would therefore require lots and lots of gears to get a decent range of speed.

I's like an ultra extreme version of a truck engine, huge torque low power low rpm. therefore requires tons of gears.
 
No problem. The other way is not preferred though.
That's why diesel engines are used in passenger cars as well as in trucks while petrol engines aren't used for trucks though by gear reduction you could produce enough torque.. Frictional power loss and engine life are two dominant factors which decide the suitability here, i think.
This reason is also linked to the one why people advise you not to ride in low gear very often.
 
Hi Folks,

Sorry, I should have been more precise...

Assume enough torque is available to allow standing start without downshifting, as with a steam engine or electric motor.

Cheers!

Bill
 

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