|Oct 14, 2011, 05:33 PM|
What is Switching Frequency?
I have the Turnigy 55Amp Delx Esc.
It has 8kHz & 16kHz.
What one should I use? 8 or 16?
Here is the ESC Link if you need it:
|Oct 14, 2011, 09:18 PM|
Words of wisdom from Ron:
PWM = Pulse Width Modulation
Unless your ESC is at full power, the ESC pulses (or chops up) the voltage to the motor. The wider the pulse, the more power it gets, 100% pulse width is 100% power. The frequency of these pulses can be 8kHz, 16kHz or 32kHz. Although the voltage to the motor is pulsed, the current to/in the motor is not pulsed. The 'smoothess' of the current depends in the motors inductance (the more inductance, the smoother) and the PWM frequency (the higher the frequency, the smoother). High inductance (e.g. outrunners) motors can do with 8kHz, low inductance motors (eg. slotless or ironless motors, Kontronik Tango) need 32kHz. Driving a high inductance motor with 32kHz won't hurt, but controller losses will be higher. So in your outrunner case, use 8kHz.
Vriendelijke groeten Ron
|Oct 15, 2011, 07:41 AM|
Some suggestions to start with:
Outrunner motors: most likely 8 khz (unless you are turning high rpms in edf or heli)
8 pole inrunner (neu 1900, big astro brushless)- 8khz or 12 khz
6 or 4 pole inrunner (mega, neu, astro, aveox): 12 khz (or 8 if your esc won't do 12)
2 pole inrunner (slotless, hacker, kontronic, etc) 16 khz
kontronic tango: 32 khz
|Oct 15, 2011, 07:43 AM|
If using helis, there is a formula I've seen in the castle creations forum on how to calculate needed frequency, and it uses motor poles, gear ratio, head speed, etc to come up with an estimate.
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Discussion||What is the lowest frequency that can be used for FPV?||GJH||FPV Talk||10||Sep 29, 2011 01:59 AM|
|Gallery||Brushed controller switching frequency||BigR||DIY Electronics||24||Jul 27, 2011 05:32 AM|
|Best switching frequency (FUN 600-18 + Futura 18.48K)||ThomasJoehnk||Power Systems||6||Jul 12, 2003 03:59 PM|
|Switching Frequency Discussion||Sloper Mario||Power Systems||21||Nov 13, 2002 04:04 PM|
|ESC switching frequency... high or low?||paulaac||Power Systems||22||Feb 27, 2002 11:14 AM|