how many volts will the 21.5T handle?

[Semi Pro]

so im building a new truck and i was wondering how many volts the redline 21.5t can really handle.

its 1650kv so 22.2v only puts the rpm at 36k but is that going to last?

[crazyjr]

I am intrested as well, i asked Novak in an Email, but got no response yet

[BrianG]

There are two factors that determine how much voltage a motor can take.

1) Electrically, the dialectric strength of the coil wire insulation, which is usually some type of varnish substance. As long as the voltage isn't high enough to "jump through" the insulation, which usually takes into the hundreds of volts, the coil is fine. However, a voltage that is too high can cause overheating, which could melt this insulation shorting the coils. This would appear to be caused by overvoltage, but only indirectly as the real culprit is the current.

2) Mechanically, the rpm limit. As long as the kv * v doesn't exceed the max rpm limit of the motor, it's fine.

[Semi Pro]

Originally Posted by BrianG

There are two factors that determine how much voltage a motor can take.

1) Electrically, the dialectric strength of the coil wire insulation, which is usually some type of varnish substance. As long as the voltage isn't high enough to "jump through" the insulation, which usually takes into the hundreds of volts, the coil is fine. However, a voltage that is too high can cause overheating, which could melt this insulation shorting the coils. This would appear to be caused by overvoltage, but only indirectly as the real culprit is the current.

2) Mechanically, the rpm limit. As long as the kv * v doesn't exceed the max rpm limit of the motor, it's fine.

so based on your statements as long as the motor does not overheat it will be fine.

[BrianG]

Pretty much.

[Semi Pro]

Originally Posted by BrianG

Pretty much.

did i ever tell you your my brushless hero?

[BrianG]

Hero eh? I don't know about that as I'm not even wearing a cape.

BTW: The explanation I gave above are the only things I can think of. Maybe a Tekin engineer may have other thoughts. However, in electronics in general, voltage limits are defined by the non-conductive properties of insulators, and the extra current a higher voltage can produce.

[TekinTeamMgr]

What is the application you're using this in?

[snellemin]

I ran 6s1p(a123) with my 21.5T motor(different brand). I did have a 14mm rotor in there though and it was fine.

[crazyjr]

Originally Posted by TekinTeamMgr

What is the application you're using this in?

My plan is to run one on a mmpro or a possible smaller 6s tekin esc, not sure if you are designing one yet. I have been running a lehner basic xl 1200 in a rc10GT conversion, while i got the efficiency i wanted (nearly 30 minutes on a 2500 mah lipo in 5s setup) the raw torque is spreading the diff plates at the dogbones. My aim is to use the 21.5 or 25.5 on 5 or 6s lipo and maintain the efficiency, while lowering the torque with a smaller motor setup.

I do not run this setup yet, i am trying to find out if the motor will handle the voltage. I will be gearing for mid 30's for starters

[Semi Pro]

Originally Posted by TekinTeamMgr

What is the application you're using this in?

a 4lb scx based scale truck with some balls

mmp esc
rc 4wd 1.55 stamped steal wheels and dirt grabber tires
hyperion 1600mah 35c 6s pack

top speed will be based on how much bottom end torque i need and motor temps, but im hopeing for 25-30mph

if i dont use the 21.5 i will end up useing an outrunner

[TekinTeamMgr]

I'm just not sure a 21.5 is the answer for this application. I would be using a 13.5 or something with more power from the get go.

[crazyjr]

Originally Posted by TekinTeamMgr

I'm just not sure a 21.5 is the answer for this application. I would be using a 13.5 or something with more power from the get go.

Was this directed at me or semipro? Mine will be used in a stadium truck, not an SC. Weight should be around 4.5 to 5 pounds, or whatever a standard ST weighs

[TekinTeamMgr]

If we're talking short course again there should be no need for a 3s. However if that's what you insist on running use something like a 13.5 or 17.5. Your gearing will become the problem as the KV x Lipo cell count will create a super high rpm setup.