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05-06-2011, 05:09 AM
| #1 |
| Newbie Join Date: Apr 2011 Location: NZ
Posts: 9
|  Old brushed motor capacitor question
Hi everyone, I am new to R/C and trying to have some fun with some old R/C equipment. I am wanting to use some old brushed motors with an old Apex Twin Motor ESC. I am a little confused with the type of capacitors to put on the motors. A friend has a Novak ESC and the manual says use 0.1uF capacitors, unfortunately the Apex ESC manual doesn't say what type of capacitor to use. The motor's currently have 0.22uF capacitors on them. Should I replace them with 0.1uF capacitors instead? I don't know much about electronics so don't know if this would harm the motor's, ESC, or if it would make no difference at all. Any help appreciated, Thanks. |
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05-06-2011, 07:38 AM
| #2 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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What motors? Typically, high turn motors dont really need caps.
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05-06-2011, 04:01 PM
| #3 |
| Newbie Join Date: Apr 2011 Location: NZ
Posts: 9
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They are 19turn motors and I am planning to be running 14.4v What is the different between using 0.1uF and 0.22uF capacitors as I have no idea? ~~~~ Edit: I found a comment on capacitors online stating;"The general rule of thumb is the larger the value the lower the frequency that's shunt to ground." I assume this means that the 0.22uF capacitors will be removing more 'noise' than the 0.1uF capacitors. The 'noise' is what can interfere/damage ESC,etc... So two questions still are to be answered. 1) What impact will the capacitors mounted on brushed motors have on the 'performance' of the motors,ESC,recievers,servos, or batteries? (will they interfere with the strength of electrical signal and effect any of the mentioned electrical components in either heat, stress, or power/performance?) 2) Are 0.1uF capacitors 'the' only size that are used on R/C brushed motors? Maybe someone has installed 0.22uF capacitors on these motors in error? Maybe 0.22uF is overkill and not needed over 0.1uF or detremental/damaging in some way or not? Whatever capacitors are best to use is fine by me, I just need someone that has the knowledge to tell me which to use. I have some 0.1uF capacitors on hand that I was going to attach to some standard silver can motors. I can easily change the 0.22uF capacitors on the 19turn motors to 0.1uF if need be. Thanks. Last edited by jclampy; 05-06-2011 at 04:38 PM. |
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05-06-2011, 04:21 PM
| #4 |
| Rock Crawler Join Date: May 2009 Location: Queensland, Australia
Posts: 610
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Capacitors are cheap insurance for glitching... Jclampy: The difference between the two is minimal. The numbers are the microfarad rating & the way i understand it is the higher values filter the RF noise more. Just run what you have mate...it wont do any damage that i'm aware of having a higher value capacitor on the motors. |
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05-06-2011, 04:29 PM
| #5 |
| owner, Holmes Hobbies LLC   Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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And if you are running a 2.4ghz radio the caps do nothing to help.
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05-06-2011, 05:30 PM
| #6 |
| Newbie Join Date: Apr 2011 Location: NZ
Posts: 9
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Thankyou for your answers. Unfortunately not 2.4ghz, currently using AM. I said was 'old' R/C equipment.  Just wanting to try out two different setups, one for bashing and one for crawling and see how much enjoyment/use I get out of them. Cheers. Last edited by jclampy; 05-06-2011 at 05:47 PM. |
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05-06-2011, 07:41 PM
| #7 |
| I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Either cap will work fine.... Later EddieO |
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05-06-2011, 10:39 PM
| #8 |
| Newbie Join Date: Apr 2011 Location: NZ
Posts: 9
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Cheers EddieO, Just need to wire up the second battery so won't be too far away now. |
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