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Difference between Sensored and Sensorless BL Motors????

Discussion in 'Batteries - ESCs - Motors Section' started by LeeSc10, Jul 1, 2012.

  1. LeeSc10

    LeeSc10 Well-Known Member

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    Yeah so i'm stuck trying to figure out what the differences are between sensored and sensorless BL (brushless) motors. Which one puts out more power. Also what's a good KV rating higher kv or lower (i.e. 4200kv better than 3300kv?)
     
    Tim Charles likes this.
  2. tmail61

    tmail61 Well-Known Member Factory Member

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    4200 rpm per volt input is better than 3300 rpm per volt input
     
  3. Martijn

    Martijn Well-Known Member

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    A sensored motor is a motor with a sensorcable. The sensors will detect where the sensor is, and this will make the motor smoother at low rmp/speed
    A sensorless motor is obvious a motor without a sensorcalbe. This motor will shake your car a bit more at low speeds. (There is an other word or this but I can't remember it :) )
    Correct me if I'm wrong there :p

    Like tmail said, Kv = rpm per volt
    So if you ran a 7.4 lipo the motor will spin: 4200 x 7.4 = 31,080
    And a 3300 will spin: 3300 x 7.4 = 24,420
     
  4. tmail61

    tmail61 Well-Known Member Factory Member

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    cog
     
  5. Martijn

    Martijn Well-Known Member

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    Yes that's the word :D
    Thanks
     
  6. AERacer

    AERacer Administrator Staff Member Moderator Factory Member

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    If this is for racing, I would say first to check your track classes and rules.

    Too much KV will just make your truck hard to control. Depending how much KV you use, you'll need to play with gearing. In your manual, there is a section about gearing. Some companies like Reedy still use the old T (referencing to the number of turns of brushed motors in the old days) method to rate their motors.

    I run a Reedy 7.5T (5132 kv) in my B4.1 and this is crazy fast, too fast for our tracks condition. I rarely nail the throttle more than 1/4.
     
  7. LeeSc10

    LeeSc10 Well-Known Member

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    Not for racing. Just some info I was wondering. I have a castle 5700kv in my sc10 with the stock spur gear and a 15 tooth pinon.
     
  8. RCJUNKY

    RCJUNKY Well-Known Member

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  9. RCevolution100

    RCevolution100 Well-Known Member

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    If you are just bashing that will probably be a lot to handle in 2wd for bashing I run a 3800kv castle creations system works great
     

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