silvercan capasitors

silvercan capasitors
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car General Discussions >> silvercan capasitors

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silvercan capasitors - 5/13/2008 1:08:12 AM

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From: markham, ON, CANADA
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i have a couple 50v 470uF and i was wondering if it was possible to mount it on the standard tamiya silver cans and can i run it through a duratrax 16T esc and have any effect on speed

if i could get consiterable speed out of it please tell how to put it on and if you can add a diagram that would be great (first time putting one on)

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RE: silvercan capasitors - 5/13/2008 1:46:07 AM

Access

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You want to mount them on the battery end, not the motor end; and it won't increase your top speed at full throttle, it might however make the mid-throttle range a little smoother and more efficient, easier on your batteries. But 470uF is not really that much, especially if they are not the low ESR / high ripple current type.

(in reply to DriftingDragon)

RE: silvercan capasitors - 5/13/2008 2:49:22 AM

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so that wouldnt blow my esc??

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(in reply to Access)

RE: silvercan capasitors - 5/13/2008 3:03:28 AM

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quote:

You want to mount them on the battery end

I'm not sure I understand why you say that. If you mean on the ESC side of the motor-ESC connection then its same as on the motor side obviously, and you don't get any sort of benefit from running a cap in parallel with the battery.

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(in reply to DriftingDragon)

RE: silvercan capasitors - 5/13/2008 3:15:55 AM

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Joined: 7/26/2006
From: markham, ON, CANADA
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so would i connect it to the motor directly

i have seen capasitors on the motors directly conneted to the motor wires and the motor i can post a pic tommarrow

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(in reply to sheograth)

RE: silvercan capasitors - 5/13/2008 3:59:34 AM

Access

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quote:

ORIGINAL: sheograth

quote:

You want to mount them on the battery end

I'm not sure I understand why you say that. If you mean on the ESC side of the motor-ESC connection then its same as on the motor side obviously, and you don't get any sort of benefit from running a cap in parallel with the battery.

You do, that's why ESCs have capacitors on them to begin with.

The ESC is using PWM to control the power to the motor in the mid-throttle. So a capacitor in parallel with the battery is charged in the PWM off-cycle and discharged in the PWM on-cycle, lessening the stress on the battery.

One way to illustrate this is to consider say a 100A ESC hooked to a motor that will actually draw 100A at full running voltage. If you hold the throttle at the 10% mark, the ESC is NOT drawing a constant 10A. Every 1/8000th of a second or so, it draws 100A for (a short time) T, and then 0A for 9T. Normally the ESC has some capacitors in parallel with the battery to even out this strain somewhat, but adding extra capacitors there can help. Now mind you in a real system you have the impedence of the motor, so it's not a straight square wave either, but you get the idea.

At full throttle, the ESC is no longer switching, it is a closed circuit all the time. Any advantage given by a capacitor quickly disappears.

(in reply to sheograth)

RE: silvercan capasitors - 5/13/2008 4:10:44 AM

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From: markham, ON, CANADA
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i want raw speed so should i put it on the motor directly?

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(in reply to Access)

RE: silvercan capasitors - 5/13/2008 4:20:47 AM

Access

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No, not going to do you any good for raw speed, it's just extra weight.

(in reply to DriftingDragon)

RE: silvercan capasitors - 5/13/2008 6:08:55 AM

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DriftingDragon, the capacitors that you have seen on motors are .01 uf capacitors.

Capacitors are for use on electric motors when used in conjunction with electronic speed controls. The capacitors help filter out the 'electronic' noise.

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(in reply to Access)

RE: silvercan capasitors - 5/13/2008 7:02:05 AM

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From: Berkeley, CA, USA
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quote:

The ESC is using PWM to control the power to the motor in the mid-throttle. So a capacitor in parallel with the battery is charged in the PWM off-cycle and discharged in the PWM on-cycle, lessening the stress on the battery.

Ah I got it.

I forgot about the ESC pulling current in pulses from the battery, I just thought of the noise at the output end.

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(in reply to Longhair)

RE: silvercan capasitors - 5/13/2008 12:31:19 PM

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quote:

ORIGINAL: Longhair

DriftingDragon, the capacitors that you have seen on motors are .01 uf capacitors.

Capacitors are for use on electric motors when used in conjunction with electronic speed controls. The capacitors help filter out the 'electronic' noise.

RF emissions that might otherwise interfere with radios (the receiver) and the like.
Those are also ceramic, not electrolytic, like the type he cited in his initial post "50v 470uF". If you put an electrolytic there instead of a ceramic, it would be rather ineffective as a filter, relative to something like a 0.1uF ceramic. When you are designing real electronics, its common to put a 0.1uF ceramic near any part that requires Vcc on the Vcc line. And if the part is a major noise source, you might put 2 or 3 caps of different values like a 10uF low ESR electrolytic, a 0.1uF ceramic and a 0.005uF ceramic to try to cover all the different frequencies of noise.

(in reply to Longhair)

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