noob question

[Jirimar]

why do you need to solder caps on the leads of a motor?
does this prevent something?

[retoabcr]

suppresion of noise of motor so the system doesnt absorb that headache! Also use a S. Diode for spikes which connect to + and - post. The gray end is pos.

[Jirimar]

suppresion of noise of motor so the system doesnt absorb that headache! Also use a S. Diode for spikes which connect to + and - post. The gray end is pos.


thanks.

what noise? are we talking sound, vibration, or frequency? system absorb what?

[RGinCanada]

Jirimar:

The "noise" is RF (radio frequency) interference generated by the motor. My electrical engineering courses are years behind me, but if I recall correctly they are caused by small current surges induced in the wire as the motor turns through the magnetic field.

These are fed back out of the motor, and capacitors will level these out so that your radio control reciever isn't affected.

Hope this helps!

[Jirimar]

Jirimar:

The "noise" is RF (radio frequency) interference generated by the motor. My electrical engineering courses are years behind me, but if I recall correctly they are caused by small current surges induced in the wire as the motor turns through the magnetic field.

These are fed back out of the motor, and capacitors will level these out so that your radio control reciever isn't affected.

Hope this helps!

absolutely helps. thanks

and that explaines a problem i had with my Yamato. the revolving turrets would suddenly twitch alot a certian distance from the transmitter.

i'm one of those people with a mechanical mind, if i can't see it or touch it, i don't understand it. :D

[Olscuzbut]

The biggest contributor of noise from your motor is the arcing between the brushes and the armature. The capacitors are about the only way you can limit the amount of interfering RF noise to your boat receiver.

[bigford]

is this still a problem with the 2.4 gig set ups??

[Umi_Ryuzuki]

is this still a problem with the 2.4 gig set ups??

It is not supposed to be an issue with the 2.4g sets, but
the capacitors are so cheap, and I have been adding them for so long, it's
now just a habit... and I figure why not be on the safe side.
Also, if there is an older radio on the pond maybe it helps them.. :o

[bigford]

umi

you think my noise would bother somebody else's radio?

[Umi_Ryuzuki]

umi

you think my noise would bother somebody else's radio?

It's hard to imagine that it would.
Most frequency issues come down to cheap toys with poorly tuned radios.

;)

[boat_builder]

suppresion of noise of motor so the system doesnt absorb that headache! Also use a S. Diode for spikes which connect to + and - post. The gray end is pos.

I always used Schkotty (?spelling?) Diodes on my cars that ran only in forward (like one that uses a forward only racing ESC). If you use them with an ESC that has reverse the diode will pop as soon as reverse is applied. We always used the diode because it helped to prevent brake fade during long races. I wouldn't think one would be needed for a boat or at least I've never heard of them being used for any other purpose but I could be wrong. What do you mean by "spikes"? Do you mean voltage spikes? I'm willing to learn something new. :)

[Olscuzbut]

The newer digital Tx/Rx systems can still be affected by some really noisy motors. Since it works with 1's and 0's, high voltage spikes from the brushes arcing may be picked up by the Rx (receiver) as a 1 instead of a 0, giving eroneous control commands. Not having read the down to earth nitty gritty specs on some of the high end units, its likely they have built in integrity circuits to keep the noise spikes out. Just some food for thought, and as umi says, the capacitors are cheap.

[retoabcr]

I find alot of problems in brushed motors where brush alignment is not correct and brushes burn and arch. Where you see discolored brush indicates poor alignment and to little advance or to much advance of timing. Correct the alignment and then make sure the whole face of brush is touching the comm, if correct this. Also take a small file and file the brush edges to try and eliminate the arching, it helps. When doing this procedure, take your time and do it right. The thing is BL has taken over the market and brush workmanship has become a lost art. I don't race cause of the expense of equipment to win and price of vehicle fuel and lodging in summertime will put you in debt, deep! Quality of brushes is also a big factor and believe it or not, just solder brush leads next to brushes is your best bet. Those leads you can buy for brushed motors, DON'T BUY, not worth a plug nickel. I like to go fast too, but alot of the so called cheap boat weren't designed to go over 18-20 mph. Get a Lazer kit and a decent motor, machine or handwound and a 45amp esc and a 632 prop with .130 cable or wire drive and use surface drive. Make your own hardware and look around at different boats that resemble yours and go from there. Enjoy rc boating, they're alot of fun. I didn't know how to spell it either till now Schottky Diode,LOL! I just ordered 10 for $5.00!

[boat_builder]

I find alot of problems in brushed motors where brush alignment is not correct and brushes burn and arch. Where you see discolored brush indicates poor alignment and to little advance or to much advance of timing. Correct the alignment and then make sure the whole face of brush is touching the comm, if correct this. Also take a small file and file the brush edges to try and eliminate the arching, it helps. When doing this procedure, take your time and do it right. The thing is BL has taken over the market and brush workmanship has become a lost art. I don't race cause of the expense of equipment to win and price of vehicle fuel and lodging in summertime will put you in debt, deep! Quality of brushes is also a big factor and believe it or not, just solder brush leads next to brushes is your best bet. Those leads you can buy for brushed motors, DON'T BUY, not worth a plug nickel. I like to go fast too, but alot of the so called cheap boat weren't designed to go over 18-20 mph. Get a Lazer kit and a decent motor, machine or handwound and a 45amp esc and a 632 prop with .130 cable or wire drive and use surface drive. Make your own hardware and look around at different boats that resemble yours and go from there. Enjoy rc boating, they're alot of fun. I didn't know how to spell it either till now Schottky Diode,LOL! I just ordered 10 for $5.00!

Wow you got a deal then. Last I remembered they were about $4-5 apiece.