Selecting Motor for Load: Min Torque Req'd?

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Discussion Overview

The discussion revolves around selecting an appropriate motor for a specific load, focusing on determining the minimum torque required for rotation. Participants explore the implications of motor characteristics, gear configurations, and additional parameters affecting torque calculations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks to understand the minimum torque required for their load, referencing the equation T=rFsin(theta) but expressing uncertainty about its application.
  • Another participant notes that insufficient information has been provided to calculate torque or other necessary parameters for motor selection.
  • A different participant questions the arrangement of the load, suggesting that the distribution of mass along the axis will affect the starting torque required.
  • The original poster acknowledges vagueness in their description and mentions that speed is a variable factor due to the use of a PWM signal and microstepping for smoother operation.
  • The original poster clarifies that there will not be additional components like pulleys, as the vertical shaft will directly hold the satellite receiver.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are multiple competing views regarding the necessary parameters and calculations for determining the minimum torque required.

Contextual Notes

The discussion highlights limitations in the information provided, such as the need for specific details about the load arrangement and the effects of speed and mass distribution on torque requirements.

vengeful
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Here's my problem, I want to choose a motor to drive my load but I'm not sure about those choices as motor characteristics are given in torque. I want to know what is the MINIMUM Torque required to be able to rotate my load. I thought about T=rFsin(theta), but not sure how it would apply to my system. The gear configuration should also provide me with some extra torque, so all I want to know what would the minimum be??
 

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You have not given enough information to calculate torque or any other parameter necessary for motor selection.
 
What is your arrangement? This figure shows that you are only going to rotate a shaft. Aren't there pulley's and other stuff? Because more the mass is distributed along the axis more will be the starting torque required. So you should be a little specific.
 
I admit reading it again, maybe I was a little vague. The extra parameters you would be talking about would be the speed that I would wan to move at? If so, that would be hard to say as I would be sending a variable PWM signal, the actual term is called Microstepping- where I simulate as close as possible to a sine wave curve, this would give me a smoother operation so the theory says. Anyway if there are other parameters, please point me in the direction, so I could get them and do any necessary calculations.

I don't think that there will be any pulleys or anything else, the vertical shaft is what will be holding my satellite receiver, and to me it seems the simplest solution to just attach the receiver dish via a bracket of some sort to the shaft that rotates.
 

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