Model Boat Mayhem - Forum

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: motor suppression capacitor  (Read 550 times)

ollychap85

  • Shipmate
  • *
  • Offline Offline
  • Posts: 22
  • Location: suffolk uk
motor suppression capacitor
« on: July 21, 2019, 01:21:41 PM »

Can anyone tell me what capacitors I need for a 540 brushed motor .


if anyone can provide an eBay link where I can buy some that would be most helpful



Logged

DaveM

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 367
  • Why on earth do I do this?
  • Location: Nottingham
Re: motor suppression capacitor
« Reply #1 on: July 21, 2019, 01:35:51 PM »

Fit one 0.1uF - 0.47uF across the motor terminals. Ceramic disc types are cheapest, but don't use an electrolytic type because they are polarity-sensitive. You can also fit a 0.01uF capacitor between each motor terminal and the motor case. A suitable kit is here https://www.componentshop.co.uk/small-rfi-kit.html
DaveM
Logged

roycv

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,338
  • Location: S.W. Herts
Re: motor suppression capacitor
« Reply #2 on: July 21, 2019, 02:41:51 PM »

Hi, sometimes marked 104 for value, you need 50 volt working or greater, most are 50volt+.  They are incredibly cheap if you have a component shop nearby, I used to buy in units of 100 and they were 2p each cap.
Some of the more expensive 540's have internal suppression capacitors already fitted.  I have found that if it all works at 30 odd feet but then there is stuttering at further distances then fitting the caps from motor terminal to motor body will sort this out.
As far as I know you do not have to worry for 2.4 Ghtz, but you might cause problems for someone closeby who isn't.

I have also come across a Graupner 540 size motor with the speed controller built in so there is a servo lead coming from the motor as well.
regards
 Roy
Logged

ollychap85

  • Shipmate
  • *
  • Offline Offline
  • Posts: 22
  • Location: suffolk uk
Re: motor suppression capacitor
« Reply #3 on: July 21, 2019, 04:32:34 PM »

its just a cheep 540 from hobbyking so dont think it has the capacitors fitted inside I cant see any .


just to be clear would these do the job ? https://www.ebay.co.uk/itm/50-x-10nF-Ceramic-Disc-Capacitor-103-50V-UK-1st-CLASS-POST/300695073517?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649


thanks everyone for you help


oliver
Logged

coch y bonddu

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 233
  • Model Boat Mayhem is Great!
  • Location: Bethesda
Re: motor suppression capacitor
« Reply #4 on: July 21, 2019, 04:54:25 PM »

yes they will do




Dave
Logged

ollychap85

  • Shipmate
  • *
  • Offline Offline
  • Posts: 22
  • Location: suffolk uk
Re: motor suppression capacitor
« Reply #5 on: July 21, 2019, 06:14:02 PM »

Thanks 👍
Logged

roycv

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,338
  • Location: S.W. Herts
Re: motor suppression capacitor
« Reply #6 on: July 21, 2019, 07:21:18 PM »

Hi I agree but it is a lot of money to pay for a cheap capacitor!
Just checked my spares boxes.  I have more than enough for me.  Cap, 0,01 micro farad 50 volt working.
If you send me a self addressed envelope I will send you half a dozen, no charge. 

If this OK  I will PM my address to you.  Anyway today is my birthday!
all the best

Roy
Logged

ollychap85

  • Shipmate
  • *
  • Offline Offline
  • Posts: 22
  • Location: suffolk uk
Re: motor suppression capacitor
« Reply #7 on: July 21, 2019, 10:36:31 PM »

Thanks very much for your kind offer but I have already bought the ones from eBay

I will give a lot of them away next time I go to the boat club if anyone wants any

Hope you had a great birthday

Thanks
Oliver
Logged

canabus

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 763
  • Boats a hole in the water you pour money into!!!
  • Location: Tasmania,Australia
Re: motor suppression capacitor
« Reply #8 on: July 22, 2019, 06:36:30 AM »

Hi All
The HPI rock crawler motor have them built in.
Canabus
Logged
Pages: [1]   Go Up