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Electronics/batteries/voltage question for the experts.

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Hetzer
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Joined: 19 Feb 2007
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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
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Nobby the Bastard
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Joined: 16 Aug 2013
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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
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Islander
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Joined: 05 Aug 2012
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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.
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Hetzer
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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.
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Last edited by Hetzer on 14:02 - 26 Aug 2017; edited 1 time in total
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Hetzer
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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
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Last edited by Hetzer on 14:00 - 26 Aug 2017; edited 1 time in total
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Hetzer
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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.
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Hetzer
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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
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duhawkz
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Joined: 03 Dec 2006
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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


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Hetzer
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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.
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ScaredyCat
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PostPosted: 20:36 - 26 Aug 2017    Post subject: Reply with quote
https://www.youtube.com/watch?v=RpOOD66kX70
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