Is it okay to increase DC motor RPM by using higher voltage

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Discussion Overview

The discussion revolves around the feasibility of increasing the RPM of a DC motor by applying a higher voltage, specifically in the context of a project involving cutting carbon arrows. Participants explore various motor options and alternatives to achieve the desired RPM of at least 8000.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether increasing the voltage can effectively raise the motor's RPM from 1650 to 8000, expressing concerns about potential damage and safety risks.
  • Another suggests that exceeding the motor's specifications slightly (up to 2000 RPM) might be possible, but doubts the feasibility of reaching 8000 RPM without consequences.
  • Several participants propose alternative motor sources, such as junked treadmills, vacuum cleaner motors, blenders, and die grinders, which may inherently operate at higher RPMs.
  • There is a suggestion to avoid using gears at high speeds and instead consider direct drive or air motors for better performance.

Areas of Agreement / Disagreement

Participants express differing opinions on the safety and feasibility of increasing the motor's RPM through higher voltage, with no consensus on the best approach to achieve the desired RPM.

Contextual Notes

Participants mention various motor types and their characteristics, but there are unresolved assumptions regarding the implications of exceeding voltage specifications and the suitability of different motor types for the intended application.

Who May Find This Useful

Individuals interested in DIY projects involving motors, particularly those looking for high RPM solutions for cutting or similar applications.

Pysiek
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Hello guys
I'm looking for a motor for my arrow saw project. I would like to use it to cut carbon arrows. Found one motor in the shop that is pretty small and will work perfectly with my jig. But it's rpm's are only 1650 and I need at least 8000 RPM. Is it possible to increase the motor RPM's by increasing voltage? Motor specs:
Voltage - 74 DC
RPM - 1650
Amps - .4
Hp - 1/75
 
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I would expect that you can exceed the specs a bit (like 2000 instead of 1650), but I really doubt that you can get 8000 RPM directly from the motor - I will probably ruin the motor, and it can be dangerous for you as well. There is a good reason why the specifications do not quote a larger value.
Gears might work.
 
That's what I thought. Looks like I need to go out shopping :-)
 
Look for junked treadmills. I gave got several 6,000 RPM 90 volt DC motors out of them. They ran okay on full wave rectified housepower with no filter capacitor, which would be ~120 VDC unfiltered so probably puts the motor in your speed range . An ordinary lamp dimmer gave me speed control.

Another thought - Vacuum cleaner motors run in the 10,000 rpm range but are noisy. You'd have to put an enclosure around it.
 
Another possibility is a blender ( I broke my 1000W Ninja blender under warranty and got the motor out of it...) or look for a damaged drill or dremmel type tool.
 
Blender sounds good. I might even have one :-)
 
It is best to avoid gears at those speeds and use direct drive, or an air motor.
High RPM motors are long and thin. Slow speed motors are short and fat.
A die grinder might be a good solution. Also a small router.
 

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