Go Back   oOple.com Forums > General > Electrics

Reply
 
Thread Tools Display Modes
  #1  
Old 24-04-2019
Ross's Avatar
Ross Ross is offline
Mad Member
 
Join Date: May 2009
Location: Dunstable
Posts: 1,614
Default PWM Frequency

How do I find out the PWM frequency of a motor. It's a brushed Mardave G2.

Thanks
__________________
I live with fear everyday....sometimes she lets me race!!!!

Schumacher F1..The original KF.
TLR 5.0 AC .. FORSALE
Reply With Quote
  #2  
Old 25-04-2019
pugs's Avatar
pugs pugs is offline
Senior Member
 
Join Date: Jan 2007
Location: durham
Posts: 767
Default

The motor has no frequency as such really, its just dc voltage to drive it, any frequency would be generated by the speed control I would have thought, like at low speeds
__________________
trader feedback here: http://www.oople.com/forums/showthread.php?t=39759

Last edited by pugs; 25-04-2019 at 10:17 AM.
Reply With Quote
  #3  
Old 25-04-2019
Ross's Avatar
Ross Ross is offline
Mad Member
 
Join Date: May 2009
Location: Dunstable
Posts: 1,614
Default

Quote:
Originally Posted by pugs View Post
The motor has no frequency as such really, its just dc voltage to drive it, any frequency would be generated by the speed control I would have thought, like at low speeds
Ohh, I thought it had something todo with the motor

I can change it in the speed controller setting, but i need to know the frequency.
__________________
I live with fear everyday....sometimes she lets me race!!!!

Schumacher F1..The original KF.
TLR 5.0 AC .. FORSALE
Reply With Quote
  #4  
Old 25-04-2019
steveproracing steveproracing is offline
Senior Member
 
Join Date: Aug 2007
Posts: 493
Default

Simply speaking, Esc frequency is to do with the amount of steps in the throttle range. Think of the old wiper speedos, they only had three steps, or three speeds if you like. New escs have hundreds of steps in the throttle range, but the amount of steps is adjustable. the lower the frequency, the less steps (thus a bigger jump in speed between these steps), the higher the frequency, the more steps (thus a smoother feeling throttle).

The other thing to be aware of is, the higher the frequency, the hotter the esc will run.
hope this helps
__________________
proracing
Moss Models
Associated
Reedy
DJ KIRKY
Reply With Quote
  #5  
Old 26-04-2019
Ross's Avatar
Ross Ross is offline
Mad Member
 
Join Date: May 2009
Location: Dunstable
Posts: 1,614
Thumbs up

Quote:
Originally Posted by steveproracing View Post
Simply speaking, Esc frequency is to do with the amount of steps in the throttle range. Think of the old wiper speedos, they only had three steps, or three speeds if you like. New escs have hundreds of steps in the throttle range, but the amount of steps is adjustable. the lower the frequency, the less steps (thus a bigger jump in speed between these steps), the higher the frequency, the more steps (thus a smoother feeling throttle).

The other thing to be aware of is, the higher the frequency, the hotter the esc will run.
hope this helps
Oh, that makes sense.

Thanks for explaining
__________________
I live with fear everyday....sometimes she lets me race!!!!

Schumacher F1..The original KF.
TLR 5.0 AC .. FORSALE
Reply With Quote
  #6  
Old 11-05-2019
bassman7755 bassman7755 is offline
New Member
 
Join Date: Feb 2019
Posts: 11
Default

Quote:
Originally Posted by steveproracing View Post
Simply speaking, Esc frequency is to do with the amount of steps in the throttle range. Think of the old wiper speedos, they only had three steps, or three speeds if you like.
I don't really want to get into a full blown explanation of Pulse Width Modulation but very briefly the granularity of duty cycle (number of speed gradations) is a separate parameter to the modulation frequency. https://en.wikipedia.org/wiki/Pulse-width_modulation.

Increasing the frequency will not give you more control "steps" but it will make the motor run more smoothly and respond to input faster up to a point but the flip side is that you loose power transmission efficiency (generate more heat) as you increase it so its a trade off.
Reply With Quote
  #7  
Old 12-05-2019
dodgydiy's Avatar
dodgydiy dodgydiy is offline
Senior Member
 
Join Date: Sep 2008
Location: west wales
Posts: 744
Default

you are not really likely to notice much of a difference, maybe a little smoother. only ever used the frequency setting once other than when experimenting, and that was sorting out an interference problem
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:11 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
oOple.com