brushless motor kv difference..
12-05-2010, 08:23 PM
#1
brushless motor kv difference..
what is the difference (in normal people talk 
) between say a 9200kv motor and a 6800kv motor.. ?
) between say a 9200kv motor and a 6800kv motor.. ?
12-06-2010, 03:38 AM
#2
Most simply, the 9200kv is a faster motor than the 6800kv.
The numbers are the Revolutions Per Minute per volt of input. Put 5 volts on each, they will try to run at 46,000 and 34,000 RPM respectively.
But speed comes at a price, the 9200kv will:
Run hotter.
Need lower gearing (smaller pinion, has less torque despite the RPM & power increase).
Will run the battery down quicker (less run time per charge).
Be less tolerant of high drag running surfaces (grass for example).
And is less capable of using higher voltage batteries (like a 3S lipo, there is a physical limit to motor RPM, at some point they simply fly apart from centrifugal force).
The numbers are the Revolutions Per Minute per volt of input. Put 5 volts on each, they will try to run at 46,000 and 34,000 RPM respectively.
But speed comes at a price, the 9200kv will:
Run hotter.
Need lower gearing (smaller pinion, has less torque despite the RPM & power increase).
Will run the battery down quicker (less run time per charge).
Be less tolerant of high drag running surfaces (grass for example).
And is less capable of using higher voltage batteries (like a 3S lipo, there is a physical limit to motor RPM, at some point they simply fly apart from centrifugal force).
12-06-2010, 07:35 AM
#3
the higher kv motors also have less torque than the lower kv motors
06-13-2011, 08:34 PM
#4
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