Are the new censored motors stronger then the old ones?
 

I feel like if im gonnna run sensorless i should use the old motors. My tiny head thinks the old ones would be stronger because the sensors arent taking up any room. Just wondering power wise for speed runs what would be better?

Once a sensored motor gets moving fast the sensors aren't doing anything. I think your hunch is right unless the can is longer

I think a quality 2 pole motor is ideal for speed runs(Lehner, for instance). Sensors are nice for startup - not a factor for top speed.

Yeah i was thinking more along the lines of if the new castle 2200 would be stronger then the old one. Maybe better materiels or something like that. I know sensors dont matter at speed but that seems to be their new flagship motor

IIRC, they are going to replace the sensorless with the sensored versions.

Iirc castle motors are 4 poles which have more power than 2 poles but 2 poles have higher rpm limits making them potentially faster. No?

More Poles results in more low-rpm torque, not more power. IMO, 2 poles are better for top speed aspirations, as they hold power higher into the rpms vs the higher pole motors, and have a broad efficiency range. Higher pole motors tend to have more low end power and narrower efficiency range. 4 pole motors are pretty ideal for most RC applications and work well for top speed, though I would give the edge to a 2 pole motor(for top speed).

You could always gear up a 4 pole more to compensate for lack of max power at max rpm, within reason of course. Typically top speeds are only attained for a relatively short time compared to the rest of a run, so efficiency at max rpm is not really a big concern.

Efficiency is low on the list of concerns - its all about rpms and power to get deep into the 100s(130-150mph).

Honestly everyone is running 4 pole motors for speed runs now.

There aren't a lot of 2 pole motors out there to choose from really - 4 pole motors are pretty ideal for RC and are far more available....lots of Neu motor equivalents or knockoffs out there to choose from. Setup is more important than pole count in reality - the power is the easy part once you get deep into the 100mph range.

But aren't i correct that 2 poles have higher rpm limits?

Less switching so assume that would help esc

I would have to disagree with the whole "2-pole is faster" thing.

The two pole motors on the market are three slot stators. That means they need a lot of turns per pole to make significant torque.

A lot of turns per pole means high inductance.

High inductance means power at high RPM is significantly reduced.

Most four pole motors on the market (and our designs also) are 12 slot designs. This means very few turns per pole (often only 1 turn.)

This means they have low inductance, and can make significant power at very high RPMs.

Look at the speed records. All set by four pole, 12 slot motors.