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Why Is There kV ratings and T ratings for BL Motors?

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Why Is There kV ratings and T ratings for BL Motors?

Old 01-15-2010, 03:48 PM
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alexchen86
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Default Why Is There kV ratings and T ratings for BL Motors?

I am sort of confused and a total noob to the BLworld.

Basics of brushed motors of course are more turns = less top end but more torque essential for rock crawling.

BLmotors have kV ratings and some have T ratings (I assume short for turns).

When a BL motor is says 5600kV as in my Sprint 2 Flux how many turns is that?

Also does the less T in a BL motor also equate the same way with brushed motors?

i.e. less T = more top end and less torque? And more T = more torque and less top end?

Thank You!!


Old 01-15-2010, 05:43 PM
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pythonfan
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

I'm not so sure on T, but the lower kv in bl means more torque. higher kv more rpm and top end.


A good example would be, 1/8th mt or truggy/buggie would be a 2200kv motor or around there, a 1/10th st truck buggy would be around 4600-5700 and higher, and for 1/12th or mini's 10,000 kv.

I'm sure someone else will chime in for more info, tho from my basic bl knowledge i think i hit that pretty close to the head.
Old 01-15-2010, 10:23 PM
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Willystylz
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

plus another thing is that a lower kv motor can generally handle more voltage. If you have a 5700k or higher motor, usually running a 3S lipo or higher is too much for it.

Most companies list the kv ratings of their brushless motors, and some list the # of turns as well. Essentially the # to look at when comparing motors is the kv rating.

Brushless motors generally as a rule have less turns than a comparable brushed motor. But the principle stays the same, lower turns = higher rpm on both.

Hope this helps!
Old 01-16-2010, 09:07 AM
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alexchen86
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

WillyStylz my man here to save the day...haven't heard from ya in a while bud. Thanks!
Old 01-16-2010, 10:45 AM
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Willystylz
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

No prob! Been on a vacation from RCU the last few months
Old 03-05-2010, 10:54 PM
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Hyper7driver
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

KV rating is describing how many RPM's the motor is going to try and turn per volt at free load. T is the amount of windings the motor has just like the old brushed motors. KV and turns will vary between motor types, manufactures, etc. due to different designs. So a 3300 KV motor will not always be a 17.5 turn or whatever.
Old 03-06-2010, 12:10 PM
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OvalRacer99
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Default RE: Why Is There kV ratings and T ratings for BL Motors?

An observationI have made, and I could be wrong, seems to me that most if not all sensored motors are rated by turns and unsensored motors are KV rated.
Old 03-06-2010, 12:44 PM
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MonkeyFist
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Default RE: Why Is There kV ratings and T ratings for BL Motors?


ORIGINAL: OvalRacer99

An observationI have made, and I could be wrong, seems to me that most if not all sensored motors are rated by turns and unsensored motors are KV rated.

That is usually the case. I have noticed that as well.

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