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  1. #1
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    High turn vs Low turn brushed motor

    Can someone explain the difference between a higher turn and a lower turn brushed motor.
    Not the motors physical difference but the diffference in acceleration, run time, and top end speed.
    Thanks.

  2. #2
    Marshal Dadx2mj's Avatar
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    Lower turn motors will have higher top speed but less torque or bottom end punch and shorter run times. Higher tun motors will have longer run time, more torque, but less top speed.
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  3. #3
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    What he said. Plus, the lower turn motors are often more expensive and wear out faster (brushes + lots of heat)
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  4. #4
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    Not to complicate things, but it's worth noting that this is a rule of thumb that applys to motors identical in every other way. A generic rule as such.

    You can get some 27turn motors for example that will out perform some 19 turn motors in both acceleration and top speed
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  5. #5
    RC Turnbuckle Jr. Emaxx2.0's Avatar
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    Quote Originally Posted by Hardcoretam
    Not to complicate things, but it's worth noting that this is a rule of thumb that applys to motors identical in every other way. A generic rule as such.

    You can get some 27turn motors for example that will out perform some 19 turn motors in both acceleration and top speed
    This is correct. Gearing is more important on a brush motor then a brushless. A correctly geared 27t will out proform a incorrectly geared mod.
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  6. #6
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    what is the real difference in high kv motors vs low kv motors?
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  7. #7
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    Quote Originally Posted by akrimmel
    what is the real difference in high kv motors vs low kv motors?
    kv represents rpm per volt in Brushless motors.

    a 1000kv motor, will mean the motor will attempt to reach an RPM of 1000 every 1 volt it gets.

    7.2volt battery and a traxxas vxl motor (approx 3400kv) = 7.2 x 3400 = 24480rpm


    if both motors are equal in size and equal power source for each, then as a general rule it would be

    Low kv
    more torque, less speed, cooler running and longer battery times.

    High kv
    High speeds, more power, less torque, hotter running and shorter battery times
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  8. #8
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    so same as high turn vs low turn motors then?
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  9. #9
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    Quote Originally Posted by akrimmel
    so same as high turn vs low turn motors then?
    pretty much, except the opposite way around

    Low kv brushless = high turn brushed
    High kv brushless = low turn brushed
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  10. #10
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    Quote Originally Posted by Hardcoretam
    Low kv
    more torque, less speed, cooler running and longer battery times.

    High kv
    High speeds, more power, less torque, hotter running and shorter battery times
    not completely true. high and low kv motors can produce as the same torque, but the higher kv motor will make more RPM's, draw more current and run hotter than a low kv motor GEARED THE SAME. if you gear the low kv motor higher you can go the same speed as a higher kv motor geared lower. so its not the same thing as brushed motors. you can always gear a low kv motor to have similar speed, temperature, and draw similar amounts of current. vice versa.
    this is confusing but i hope it helps.

  11. #11
    RC Turnbuckle Jr. Emaxx2.0's Avatar
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    Quote Originally Posted by brushlessbandit
    not completely true. high and low kv motors can produce as the same torque, but the higher kv motor will make more RPM's, draw more current and run hotter than a low kv motor GEARED THE SAME. if you gear the low kv motor higher you can go the same speed as a higher kv motor geared lower. so its not the same thing as brushed motors. you can always gear a low kv motor to have similar speed, temperature, and draw similar amounts of current. vice versa.
    this is confusing but i hope it helps.
    When applied to sensorless motors. Sensored base motors behave more like brush motors. Noticed crawlers use 21.5t or 17.5t sensored motors for torque (of course lower rpm).
    Last edited by Emaxx2.0; 08-10-2009 at 03:40 PM.
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  12. #12
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    Quote Originally Posted by brushlessbandit
    not completely true. high and low kv motors can produce as the same torque, but the higher kv motor will make more RPM's, draw more current and run hotter than a low kv motor GEARED THE SAME. if you gear the low kv motor higher you can go the same speed as a higher kv motor geared lower. so its not the same thing as brushed motors. you can always gear a low kv motor to have similar speed, temperature, and draw similar amounts of current. vice versa.
    this is confusing but i hope it helps.
    on the same battery, that is not corrent.
    I have a 540 1000kv crawling motor. If i gear it too high it cogs like crazy and won't move. it can't be geared to run anymore than about 10mph in my Axial
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  13. #13
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    Quote Originally Posted by Hardcoretam
    on the same battery, that is not corrent.
    I have a 540 1000kv crawling motor. If i gear it too high it cogs like crazy and won't move. it can't be geared to run anymore than about 10mph in my Axial
    i thought you meant sensorless
    Quote Originally Posted by Emaxx2.0
    Sensored base motors behave more like brush motors.
    Last edited by brushlessbandit; 08-10-2009 at 06:26 PM.

  14. #14
    RC Turnbuckle Jr. Emaxx2.0's Avatar
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    Quote Originally Posted by brushlessbandit
    like emax2.0 said sensored motors are used in rock crawlers i thought you meant sensorless
    No, I was describing how lower kv=more torque ,higher kv= less torque mostly applies to sensored base motors, not sensorless. A crawlers' motor would be a 21.5t or a 17.5t for the amount of low end torque(plus it's alot more controllable and of course low rpms).
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  15. #15
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    Quote Originally Posted by brushlessbandit
    i thought you meant sensorless
    Unfortunatily my 1000kv motor is sensorless
    It really goes suck in my crawler. It cogs under very big load even when geared down for about 3mph top end
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