Kinetic/Ballistic Systems

[NovakTwo]

Tough crowd here.......

[lutach]

Originally Posted by NovakTwo

Tough crowd here.......

Not being tough at all NovakTwo. Just like to be realistic and since Novak wants to be considered the leader in the Hobby, Novak should start setting some examples. This ratings game is over. This ESC probably has 18 FETs total correct? If so my calculation should be correct if you guys use the best ST Micro MOSFET or maybe you guys use some other PolarPAK style MOSFET from Vishay? The Vishay SiE874DF which is a 20V MOSFET has a TA rating of 52A at 25C degrees and if I use my calculation that should be a 156A rating, but we all know this little devices will never be able to dissipate so much heat if one actually sees 100A+ average. I would like to see some real world specs you know.

How do you guys come up with your ratings? Do you multiply 18 MOSFETs with 30A? If that's the way, I'm sorry to say it, but it's wrong. If you like to go with a 30A MOSFET then the max cont. burst should only be limited to 90A, but for a very short instant one can actually see a higher number depending on the voltage, motor, gearing, vehicle weight, rolling resistance, traction, tire size, aerodynamics and .....(Did I miss anything).

[NovakTwo]

C & P from the press release:

540 Amps @ 25°C trans. temp. (brushless),

1,620 Amps @ 25°C trans. temp. (brushed)

Transistor's rating at 25 C junction temp for brushless escs, specification is per each phase of brushless motor (3)

[lutach]

Originally Posted by NovakTwo

C & P from the press release:

540 Amps @ 25°C trans. temp. (brushless),

1,620 Amps @ 25°C trans. temp. (brushed)

Transistor's rating at 25 C junction temp for brushless escs, specification is per each phase of brushless motor (3)

NovakTwo,

This is just absurd information my friend. I posted the continuous AMP rating of the FET at 25°C temp. and I posted the correct way of rating the ESC. The way Novak seems to be rating the ESC is multiplying the amount of FETs by the AMP rating (18 x 30 = 540), but that's wrong. Give me your thoughts on current lipo rating? It's great that you can finally use something other than the one touch set up to fine tune the ESC, but drop the over rating please, a lot of people will respect the brand even more.

If Novak still wants to use such rating, please offer some proof to back it up.

[NovakTwo]

We have never claimed that this current rating applied to the speed control, itself.

This transistor info, (that we have been posting for decades in our BL esc spec chart,) is the transistor rating taken from the technical info sheets provided by the MOSFET manufacturers.

We have never claimed it to be anything other than that. But, I will forward these comments to Bob and Adnan.

[lutach]

Originally Posted by NovakTwo

We have never claimed that this current rating applied to the speed control, itself.

This transistor info, (that we have been posting for decades in our BL esc spec chart,) is the transistor rating taken from the technical info sheets provided by the MOSFET manufacturers.

We have never claimed it to be anything other than that. But, I will forward these comments to Bob and Adnan.

Ok, I have attached 2 datasheets that shows the 2 most powerful PolarPAK MOSFETs that I know of and the Vishay shows a 52A rating at 25°C. So lets try going with 6 FETs per phase, that's only 312A (But divide that by 2 since it's a H bridge config). Now here is the thing, if you go by the datasheet it clearly says the package is only limited to 60A, so lets go with that and multiply it by 6 and still only 360A. Now the silicon is limited to 258A, but that really doesn't mean anything if the package is only limited to 60A. Novak still uses the PolarPAK style MOSFET correct? Please have Mr. Novak and Adnan provide some input on why use such a rating if it doesn't apply to the ESC itself. At the moment, I think the Futaba brushless ESC has the most ridiculous rating of all brushless ESCs.

[NovakTwo]

The historical, ridiculous current ratings were why Adnan decided to only publish the objective transistor ratings and not make any claims about the controller itself.