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2 pole vs 4 pole with same winding

2 pole vs 4 pole with same winding

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Old 10-11-2018, 06:20 PM
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Default 2 pole vs 4 pole with same winding

Heya. Iím trying to figure out how many winds my Castle Slate Series 4 pole, 2850kv motor has.

i can guess that a 2850kv motor in 2 pole would be ďaroundĒ 15-17 turns. How many winds would one guess exist in a 4 pole motor running about the same speed?

i e asked Castle directly, but theyíre a bit cagey on the matter.
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Old 10-12-2018, 06:27 AM
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pretty cool lesson here explaining how you can do it yourself:
https://sciencing.com/how-8785428-ca...ht-length.html
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Old 10-12-2018, 10:02 AM
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Thanks for the link. Very interesting.
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Old 10-12-2018, 10:33 AM
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I'm not 100% sure, but I think the Slate motors are either 2 or 2.5T. It's really hard to compare a standard 2 pole motor to one of our motors because the design of the motor is vastly different. Our green motors are mostly 1T motors with various lengths of stator to change the KV. If everything else was equal, going to a 4 pole from a 2 pole would half the KV of the motor, but stator and magnet design will change between the pole counts and will affect the KV quite a bit.
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Old 10-12-2018, 01:56 PM
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2.5t?! Wow. Iím breaking the hell out of our short course rules. Weíre supposed to be limited to 13.5 or higher. Whoops!

i think Iíll have a peek in there. Could be educational.
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Old 10-12-2018, 02:21 PM
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If you want the fastest 13.5T spec motor that's currently on the market, then get the Punisher, it's not ROAR approved, but just as fast (if not faster) than any $150 team motor on the market. The owner at our track is allowing the Punisher to help keep costs down and eliminate motor wars in the 13.5T class:
Trinity - Punisher 13.5t World's Fastest Spec Class Sensored Brushless - PUN1001 - Active Powersports

These motors have tons of torque so you can gear them up higher than traditional spec motors. They like to have the timing set around 47į too.
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Old 10-12-2018, 02:36 PM
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Jeez, that looks like a little monster. If I find the Castle is super low turn, ill throw my R1 17.5 or 13.5 back into it.

i have to admit, I LOVE the torque and speed this Castle motor provides.
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Old 10-12-2018, 04:51 PM
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Originally Posted by monkeyracing View Post
2.5t?! Wow. Iím breaking the hell out of our short course rules. Weíre supposed to be limited to 13.5 or higher. Whoops!

i think Iíll have a peek in there. Could be educational.
Yeah for any sort of spec racing, it's going to be hard to convince a race director to let one of our motors compete just because they are very different to standard ROAR spec design that everyone else makes. For some club racing you might be able to make a case to keep running it based on lap times if you can prove that you have competitive lap times to everyone else in the class and that you arn't blowing them away with your speed.

For comparison of how different our motors are think about the fact that our 4600kv motor is a 1 turn motor but a 3.5T 2 pole motor would be ~10500KV.
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Old 10-12-2018, 05:26 PM
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That is a bit, okay, a lot, weird. I figured my 2850kv would be a much higher wind count. No one at the club cares much. Iím not a great driver. Pulls like hell in the straight though.

If if you do find specs, please fill me in.
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Old 10-12-2018, 08:09 PM
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Something to consider is that one reason why spec racing is more popular is because "slower is faster" meaning that having too much motor can be a bad thing, causing you to blow corners and spend too much time on the brake where a slower spec motor allows more smooth throttle control and less likely to break traction... it's not uncommon for 13.5T spec motors to beat guys running open mod... yeah a mod driver can turn a faster hot lap, but what wins races is consistency and it's a lot easier to get better consistency with a spec motor

A seasoned pro driver on the other hand can handle a hot motor and knows how to tune their radio properly for a given track condition.
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Old 10-12-2018, 08:21 PM
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Absolutely correct. Our local onroad club is seeing stock/mod TC times within a tenth per lap. I do find a bit more fun driving and less crashing with a slower motor. Think I’ll get one more race day with the overkill solution before I swap it out again.
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Old 10-13-2018, 03:30 AM
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You simply can't compare motors like this. turn count in itself is nothing.
A Neu 1515 2 Why does 1100Kv while a 1515 2 Delta does 2050Kv, same turn count, wildly different KV.
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