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Author Topic: can I run a 6v motor on 7.2v  (Read 503 times)

sybercottage

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can I run a 6v motor on 7.2v
« on: October 11, 2019, 09:51:36 PM »

Hi all

Can I run a MFA 280/5  3-6 volt motor with a 7.2volt battery attached to a Mtronics viper 10 esc?

Thanks
Alan

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Stan

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Re: can I run a 6v motor on 7.2v
« Reply #1 on: October 11, 2019, 10:24:17 PM »

The motor is rated at 6 volts  would suspect running at 7.2  it may get very warm or even hot. I have enclosed the link  to  M F A web. site https://www.mfacomodrills.com/pdfs/RE280-and-280-1-and%20280-5.pdf  Contact number for M F A is 01394 612132 give them a call  ask for technical
Stan.
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sybercottage

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Re: can I run a 6v motor on 7.2v
« Reply #2 on: October 11, 2019, 10:31:11 PM »

Hi Stan

Thanks for the reply. Not that well up on this, but would the power from the battery going through the Mtronics speed controller not reduce the 7.2 volt down to 6 volt. As I say I have know idea on electrics.

Thanks for the rely Stan.

Best wishes

Alan
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Stan

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Re: can I run a 6v motor on 7.2v
« Reply #3 on: October 11, 2019, 10:41:27 PM »

HI a fully charged 7.2 volt battery can be well over 8 volts. Modern speed controllers have very little voltage drop so you could find the motor is getting way over the constant 6 volts. The only way is  to check the output voltage from your speed controller with a fully charged battery. If space is not a problem then look at the 360 motor check the M F A web site for full details.

Stan {:-{ {:-{ {:-{ {:-{ {:-{ {:-{
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sybercottage

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Re: can I run a 6v motor on 7.2v
« Reply #4 on: October 11, 2019, 10:47:49 PM »

Hi Stan


Yes I see what you are saying. I will buy a 6volt battery. I have a 7.2volt battery and I thought I might be able to use that, but I think it will be easier to just buy a 6volt.

Thanks for the help Stan it is much appreciated.  :-))


Best wishes
Alan
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malcolmfrary

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Re: can I run a 6v motor on 7.2v
« Reply #5 on: October 12, 2019, 11:50:14 AM »

A 6 volt motor on 7.2 will want to spin faster.  To do this without cooking itself implies a smaller than normal prop to keep the loading down.
On the other hand, not running on permanent flat out leaves the motor "thinking" it is running on a lower voltage.  The question then becomes one of wondering if the motor will stand up to the extra RPM.
The 20% voltage increase is probably within design limits anyway, bearing in mind the loading previously mentioned.
If a programmable transmitter is used, restricting the throttle to about 80% might help, but only if done after setting the ESC to a "normal" 100% signal.

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Stan

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Re: can I run a 6v motor on 7.2v
« Reply #6 on: October 12, 2019, 01:11:01 PM »

Hi  surely would it not make sense to run the motor on 6 volts something it was designed to  be happy with. If space allows use a 360 motor this will handle 7.2 volts with no problem. After all the last thing you want is burnt out motor

Stan. {:-{ {:-{ {:-{ {:-{ {:-{right motor/battery. :-)) :-)) :-)) :-)) :-)).

https://www.mfacomodrills.com/pdfs/RE360-and-360-1.pdf
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sybercottage

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Re: can I run a 6v motor on 7.2v
« Reply #7 on: October 12, 2019, 03:44:36 PM »

Thanks Malcolm and Stan for your replays.

 
I only asked about the 7.2 volt battery as I had a spare, but did not have a 6volt. It's for an old kit i started years ago but never finished. All my other boats use 7.2 so just trying to be a cheap skate %) [size=78%]. Should have just dug into my pockets for a new battery.[/size]


Thanks again for taking the time to reply. :-))


Best wishes


Alan
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