What gears to use to reduce fan speed from fast moving motor

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SUMMARY

The discussion focuses on reducing fan blade speed using a gear system and belt mechanism. Participants emphasize the need for specific parameters such as required fan RPM, motor RPM, and blade length to determine the appropriate gear ratios. The conversation highlights the unusual requirement of having a slow-moving fan blade, prompting questions about the design and purpose of the fan. Key considerations include the type of motor, specifically whether it is an AC induction motor.

PREREQUISITES
  • Understanding of gear ratios and their impact on rotational speed
  • Familiarity with AC induction motors and their specifications
  • Knowledge of fan blade design and aerodynamics
  • Basic principles of mechanical systems involving belts and pulleys
NEXT STEPS
  • Research gear ratio calculations for fan speed reduction
  • Explore AC induction motor characteristics and performance
  • Investigate fan blade design principles for optimal airflow
  • Learn about belt and pulley systems in mechanical engineering
USEFUL FOR

Mechanical engineers, hobbyists designing custom fans, and anyone interested in optimizing fan performance through gear systems.

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hey, I am building a fan, but I need the fan blade to move relatively slow, slow enough to see each panel on the blade. I am expecting to use a gear system with a belt. What gears should I use to active this?
 
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Welcome to PF.
First we need some actual numbers.
What fan RPM do you require ?
How long are the fan blades ?

What is the RPM of the motor ?
Is the motor an AC induction motor ?
 
Slow enough to see each panel of a blade is a very unusual spec. Why have you assumed your blade will be made of multiple panels rather than single pieces? And why do you need to see each one?
 

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