How Does Battery Configuration Affect DC Motor Speed?

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Discussion Overview

The discussion revolves around how battery configuration affects the speed of a DC motor, particularly in the context of a science fair project. Participants explore the implications of using batteries in series versus parallel, considering voltage requirements and motor specifications.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • A participant hypothesizes that a DC motor will run faster with batteries in parallel compared to series and seeks an equation to explain this.
  • Another participant notes that the effectiveness of battery configuration depends on the voltage required by the motor and the voltage of the batteries, emphasizing the need for basic electrical knowledge.
  • A participant acknowledges that while a parallel setup does not increase voltage, a series configuration does, suggesting a potential shift in project focus to increasing voltage.
  • Concerns are raised about the risks of applying too much voltage, which could damage the motor or batteries, highlighting the need for a balance between series and parallel configurations to achieve the right voltage and current.
  • It is suggested that understanding the specifications of both the motor and the batteries is crucial for successful experimentation.

Areas of Agreement / Disagreement

Participants express varying views on the implications of battery configurations, with no consensus reached on the best approach for the project. There is acknowledgment of the importance of voltage and current balance, but differing opinions on how to achieve this.

Contextual Notes

Participants mention the need for knowledge about motor and battery specifications, indicating that assumptions about voltage and current capabilities may not be fully addressed.

Brandon02
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Homework Statement


Hello, I am a 6th grade student trying to build a DC motor for the science fair. My hypothesis is that the dc motor will run faster if I place batteries in parallel versus batteries in a series. Is there an equation i can look at to explain what is happening? the mootr will be like the one found on youtube built by howtolou. thank you.

Homework Equations




The Attempt at a Solution


voltage constant = (V-IR)/rpm?
 
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It will depend on the voltage required to drive the motor and the voltage of the batteries. For example, if it takes 20 volts to drive a particular motor, you can put a million 1.5 volt batteries in parallel and they will not run the motor. Sounds like you should study a bit of basic electricity before going any further.

It's a good project but without knowing a bit more of the basics you might find it overly frustrating.
 
Thank you Phinds
I understand a parallel set up will not increase the volts but a series will. Maybe my project should be about increasing voltage only. But if I make a dc motor like the one on Internet, why can't I just add enough battery to make it run and then experiment with more batteries added in a series?
Brandon
 
Brandon02 said:
Thank you Phinds
I understand a parallel set up will not increase the volts but a series will. Maybe my project should be about increasing voltage only. But if I make a dc motor like the one on Internet, why can't I just add enough battery to make it run and then experiment with more batteries added in a series?
Brandon

Too MUCH voltage is worse than too little. Too little just means it won't run. Too much means it will burn out (or the batteries will). The right voltage and not enough current won't work either. You need a happy balance of series AND parallel to get the right voltage with sufficient current capability. If the batteries are big enough (enough current capability) for the motor in the first place then series will do. You need to know what the motor specs are and what the battery specs are.
 

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