Thread: Discussion ESC Response Testing
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Old Dec 01, 2010, 08:14 AM
superek4 is offline
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Quote:
Originally Posted by kapteinkuk View Post
I have tested a few different ESC's for throttle response time, that is, the time from full throttle given to the ESC gives full motor power.

Note that the test starts a low throttle (running motor), not zero, so the start up delay is not included.




This scope screenshot shows a turnigy plush 30a ESC's response to a instaneous increase in throttle from low to full. (1.1 to 2 mS at 50Hz PPM)

Red trace: motor current.
Yellow trace: PPM signal


100Hz.

A doubling in PPM frequency halves the ESC's response time, thus makes it possible to use higher gain, and therefore making the quad more stable.

This ESC and most other I have tested uses a finite response low pass filter based on the PPM frequency, on the throttle.

The filter has 7 steps at the biggest difference in the throttle, less at smaller differences.


200Hz.


400Hz.

Tested ESCs response time at 50Hz:

Unknown #1 (99% sure it is a Jeti Advance 8A, according to the owner): 80mS
Notes: very good

Turnigy Plush 30A: 137mS

Turnigy Plush 10A: 137mS

Turnigy Plush 6A: 137mS

TowerPro H40A:: 137mS

HK-HW30A: 137mS

Turnigy K-Force 40A: 175mS

Waypoint 15A: 200mS

Turnigy Super Slow Brain 20A: 200mS
Notes: Response time is constant regardless of PPM frequency. Uses a constant time base for the filter, not the PPM frequency.

Otter BS 40A: 390mS
Notes: Also filters high to low throttle

Hyperion 10A: 490mS


I will update the list as I get my hands on more ESC's
the higher the ms the better?
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