Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Electronics/batteries/voltage question for the experts.

 Reply to topic
Bike Chat Forums Index -> Dear Auntie BCF...
View previous topic : View next topic  
Author Message

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 14:03 - 25 Aug 2017    Post subject: Electronics/batteries/voltage question for the experts. Reply with quote
I've googled, can't find anything that doesn't blather endlessly about everything but the bit I want to know, so...

x4 AA batteries = 6 volts.

Rheostat, 1.8v to 15v capability.

x2 6v motors.

If I wire both motors to the rheostat will the motors get 6v each or only 3v each?

TIA tech dudes. Smile
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"
 Back to top
View user's profile Send private message You must be logged in to rate posts

Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
Karma :
PostPosted: 16:07 - 25 Aug 2017    Post subject: Re: Electronics/batteries/voltage question for the experts. Reply with quote
Hetzer wrote:
I've googled, can't find anything that doesn't blather endlessly about everything but the bit I want to know, so...

x4 AA batteries = 6 volts.

Rheostat, 1.8v to 15v capability.

x2 6v motors.

If I wire both motors to the rheostat will the motors get 6v each or only 3v each?

TIA tech dudes. Smile


Depends on whether you wire them in series or parallel. In parallel, both motors will get the same power (assuming both motors are exactly the same*), in series the first will drain what it needs and the second will get what's left.

* No two motors are exactly the same, there will be differences but I believe the relevant factor will be resistance
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050
 Back to top
View user's profile Send private message You must be logged in to rate posts

Islander
World Chat Champion



Joined: 05 Aug 2012
Karma :
PostPosted: 22:47 - 25 Aug 2017    Post subject: Re: Electronics/batteries/voltage question for the experts. Reply with quote
Nobby the Bastard wrote:


Depends on whether you wire them in series or parallel. In parallel, both motors will get the same power (assuming both motors are exactly the same*), in series the first will drain what it needs and the second will get what's left.

* No two motors are exactly the same, there will be differences but I believe the relevant factor will be resistance


It'll largely be governed by Ohm's law. In parallel, each motor has the same voltage across it (governed by the rheostat) and depending on the resistance across the motor will draw a current determined by the voltage across it and the resistance of the load (motor).

So, current = voltage / resistance basically.

If you wire them in series then the supply voltage (governed by the rheostat) is applied across both motors and each will have half the supply voltage (assuming that they're the same) across it. The current drawn by each motor will be the same as it will be determined by the overall load resistance (remember, they're in series so there's only one current path). Differences in the motors will be reflected in the voltage across each with the chain acting as a potential divider.

Running them in series is daft, to be honest.
 Back to top
View user's profile Send private message You must be logged in to rate posts

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 13:33 - 26 Aug 2017    Post subject: Reply with quote
Thanks guys. The idea to run them in series was to match the power to the motors re voltage. I'm assuming a 6v motor will run on 1.5v but at a much reduced speed.
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"

Last edited by Hetzer on 14:02 - 26 Aug 2017; edited 1 time in total
 Back to top
View user's profile Send private message You must be logged in to rate posts

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 13:40 - 26 Aug 2017    Post subject: Reply with quote
If I used a higher-voltage battery, would the rheostat act to govern the amount of voltage reaching the motors? I assumed that's how it worked anyway but it would be very handy if I could use a higher-voltage battery, namely a 7.4v Lipo.

One-cell 6v batteries are either way too small or way too big (the build is for two very small fans in a helmet to de-fog the lenses).

https://www.youtube.com/watch?v=FxEBSFPw8nI&feature=youtu.be
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"

Last edited by Hetzer on 14:00 - 26 Aug 2017; edited 1 time in total
 Back to top
View user's profile Send private message You must be logged in to rate posts

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 14:20 - 26 Aug 2017    Post subject: Reply with quote
Nuts, the motors I ordered are rated 3.7v to 4.2v, so I guess the rheostat's work would be cut out for it trying to govern 7.4v so that the motors wouldn't burn out.
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"
 Back to top
View user's profile Send private message You must be logged in to rate posts

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 14:22 - 26 Aug 2017    Post subject: Reply with quote
Lol. Just found a bunch of re-chargeable 3.7 AA batteries in a drawer. Perfect. Smile
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"
 Back to top
View user's profile Send private message You must be logged in to rate posts

duhawkz
World Chat Champion



Joined: 03 Dec 2006
Karma :
PostPosted: 15:17 - 26 Aug 2017    Post subject: Reply with quote
Hetzer wrote:
If I used a higher-voltage battery, would the rheostat act to govern the amount of voltage reaching the motors? I assumed that's how it worked anyway but it would be very handy if I could use a higher-voltage battery, namely a 7.4v Lipo.

One-cell 6v batteries are either way too small or way too big (the build is for two very small fans in a helmet to de-fog the lenses).

https://www.youtube.com/watch?v=FxEBSFPw8nI&feature=youtu.be


Fogpal™
____________________
"The guy is a worthless cunt and I honestly believe I would be a slightly happier person if he died." - Chris-Red
 Back to top
View user's profile Send private message You must be logged in to rate posts

Hetzer
Super Spammer



Joined: 19 Feb 2007
Karma :
PostPosted: 17:52 - 26 Aug 2017    Post subject: Reply with quote
duhawkz wrote:
Hetzer wrote:
If I used a higher-voltage battery, would the rheostat act to govern the amount of voltage reaching the motors? I assumed that's how it worked anyway but it would be very handy if I could use a higher-voltage battery, namely a 7.4v Lipo.

One-cell 6v batteries are either way too small or way too big (the build is for two very small fans in a helmet to de-fog the lenses).

https://www.youtube.com/watch?v=FxEBSFPw8nI&feature=youtu.be


Fogpal™


No o dat shit wok fo me.
____________________
"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"
 Back to top
View user's profile Send private message You must be logged in to rate posts

ScaredyCat
World Chat Champion



Joined: 19 May 2012
Karma :
PostPosted: 20:36 - 26 Aug 2017    Post subject: Reply with quote
https://www.youtube.com/watch?v=RpOOD66kX70
____________________
Honda CBF125 ➝ NC700X
Honda CBF125 ↳ Speed Triple
 Back to top
View user's profile Send private message You must be logged in to rate posts
Old Thread Alert!

The last post was made 6 years, 243 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> Dear Auntie BCF... All times are GMT + 1 Hour
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 
Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.07 Sec - Server Load: 0.64 - MySQL Queries: 17 - Page Size: 70.27 Kb