Wiring a DC motor to two 9 volt batteries

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Discussion Overview

The discussion revolves around wiring a 9-volt DC motor to two 9-volt batteries, specifically focusing on the configuration of the batteries (parallel vs. series) and the implications for voltage and performance in a project involving a propeller. Participants seek clarity on the wiring process and voltage management for the motor.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant requests guidance on wiring a DC motor to two 9V batteries in parallel to power a propeller.
  • Another participant suggests connecting the positive terminals of the batteries together and the negative terminals together to the motor.
  • A participant expresses gratitude for the wiring advice and inquires about changing the voltage for a specific motor, noting the maximum voltage requirement for their project.
  • One participant asserts that the motor will operate at 9V when wired in parallel, inviting corrections regarding the physics involved.
  • Another participant proposes wiring the batteries in series to achieve 18V, which would increase the motor's speed but also drain the batteries faster, suggesting a configuration with four batteries as a potential solution.

Areas of Agreement / Disagreement

Participants present multiple views regarding the wiring configurations and voltage implications, with no consensus reached on the best approach for the motor's operation.

Contextual Notes

There are unresolved assumptions regarding the specific requirements of the motor and the implications of different wiring configurations on performance and battery life.

bcheero
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Hey everyone. I'm a beginner when it comes to making stuff with motors and batteries. Could anyone give me a link or a very good explanation on how to wire a 9 volt DC motor to 2 9V batteries (that are supposed to be wired in parallel) to power a propeller? I have the motors and the batteries, but I need the necessary wiring and knowledge to construct it.

Thanks for the help.
 
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9VMotor.jpg


You connect the positive terminals of the batteries together and to one lead of the motor, then the negative terminals together and to the other lead on the motor.

Fish
 
Wow, thank you very much. I really appreciate the help!

Also, can you tell me how to change the voltage on this DC motor? http://www.radioshack.com/product/index.jsp?productId=2102827

The device that I'm using to power should have a maximum of 12 V, but this motor can go to 18 V. I can't let this compromise my entire project on the day of competition.
 
There is nothing to "change", just use the diagram above and all will be fine.

Fish
 
Excuse me for my lack of knowledge regarding this, so you're saying that it'll stay at 9V.

AH I see now. When wiring something in parallel, the total voltage stays the same. So in effect, the motor will still be running at 9 V. Feel free to correct me if I'm wrong with the physics behind this.
 
Since you have a 18VDC motor you could wire the 2 9V batteries in series. That is connect the batteries + to - with the remaining + and - terminals to your motor. This will give you 18V and the highest speed. It will also drain your batteries faster. To resolve that you could use 4 batteries, 2 pair of series batteries connected in parallel as in post #3.
 

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