No, not starting caps, but caps to cancel the negative phase angle of current vs voltage due to the inductive reactance. Really, power factor correction. Before this thought went any further, I did some reading and found that you definitely should not use caps when the motor is being driven with a veriable speed controller, which our BL motors are. I guess that ESC designers, knowing this, probably take this into consideration somehow when designing the circuits, or maybe simply don't care.

I'm sure there is all kinds of technology out there just waiting for application in our BL world, but there must be reasons why it hasn't been done yet. Cost, complexity, comparatively low market penetration of BL equipment, etc.

I've also wondered at the Neu motor codes, but simply don't know. The 15xx and 19xx series motors are 15.6mm and 19.6mm in diameter, respectively. That seems to be a pattern until you get to the 22 series, then it falls apart since those cans are 2.5" in diameter. The last two numbers in the model seem to be related to can length. No conversion per se, but 1512's are 2.4" long, 1515's are 2.7" long, etc. But then the same last two digits mean different lengths for other series motors. I assume the "D" and "Y" stand for Delta and Wye, which is simply the coil configuration. But the number is puzzling but it seems to relate to the number of turns, but not the actual amount of turns. The lower the number the lower the turns/higher the KV.

It would be near impossible to use square wires in a motor. The routing would be a PITA, especialy thru corners. also; square wire is more sensitive for damage than round wires (on the angles the isolation will be thinner, and these angles make the windings easely shorted when pressed together.

With speakers it's fair easy to use square wire; the voicecoil is round, routing the wire straight is easy.

Yes Brian, Y stands for Wye and D for Delta winded.

What is the difference in the wye and delta winds?

A 'Wye' (Y) connection motor is the motor phases connected at one point... imagine the ends of three coils started a single point, and all connected, and then the other end of all three 'phase winds' are the input power leads.

A 'Delta' (D) configuration motor i the most used, imagine three pencils, now connect the lead of one pencil to the eraser of the next, do so in a triangle, now imagine the coils instead, and think that each connection between lead and eraser end is an input phase lead on the motor. Each input phase splits off in two, half going trough one 'phase coil' and the other half going trough the next 'phase coil'.

Do you understand now?

You can change Lehner motors config... between delta and wye i believe

In which the star (as lehner calls it) is Wye and they come standard as a Delta winded.

Leroy;

A delta gives sqrt 3 (1.73) times more power than star, and the RPM is sqrt 3 times higher. Lehner calls it; buying two motors for the price of one.. :p

I borrowed a few pics that perfectly explain what the differences in windings are;

It is for an outrunner, but the principle stays the same;

OK. I was wondering for the lehner motor difference. They come in delta
and can be changed to wye or star. It adds 1.73 to the turn. I took a
10t to a 17t. Which is the plan for project. That would be considered a 6 pole motor rene?

I thought Lehner calls it two motors for the price of because for the coil config. changeable. Are you saying that the delta has 1.73 times more power at the same voltage?

According to LMT's data it does.

Leroy; no, that is not considered a 6 pole; the poles of the brushless motors are the number of north and southpoles facing the stator in a brushless motor. a 2 pole stays a 2 pole, unless you change the rotor (which would result in other issues, because of the layout of the stator)

A bit off-topic but are you familiar with "servo-drive" speakers?

YES! of course!

the mother of all subwoofers! By coincidence; I talked about it with my nephews yesterday, they had some questions about the way a sinus is built up..

I was thinking about making some. when i was about 16 years old. it's fair easy, you can take a DC motor and loose the brushes, and connect the wires directly onto the collector.

They are (or at least were) located about 20 minutes from my house. They were (and may still be) a research facility for the Military/Government. The two most interesting "research tanks" were the 14' Laser that could cut thru 8" of solid plate steel and the low-frequency lab. I'll elaborate on that one at some point.

Yes, please do! you got my email! abuse it.. :p

First chance I get...........

Don't feel obliged! Please don't.

No problem......No pressure! LOL

unless he was feathering it that x1 didn't look like it had any low end torque. he startedf the race while moving and when he was spinning out he got backwards and didn't keep going. like i said maybe he was feathering it. impressive none the less.

Did i miss something?