RaserTech, brushless power from induction... - Page 4 - RC-Monster Forums

Serum · 12.10.2006, 03:36 PM

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;

coolhandcountry · 12.10.2006, 06:48 PM

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?

zeropointbug · 12.11.2006, 02:10 AM

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?

BrianG · 12.11.2006, 02:44 AM

Quote:

Originally Posted by zeropointbug

...Are you saying that the delta has 1.73 times more power at the same voltage?

According to LMT's data it does.

Serum · 12.11.2006, 01:49 PM

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)

Procharged5.0 · 12.11.2006, 02:11 PM

Quote:

Originally Posted by Serum

Cool.

I made a magnet-less speakers, using a speaker that didn't used a magnet, made two windings, working in opposite phase to make the voicecoil move.

I find it hard to believe though that it's about the same efficiency than a parmanent magnet type, because the magnets nowadays are unbelievable strong and this is 'free energy' I'll dig into it a bit deeper when i get back from work. If it is the case; nice piece of engineering.

They won't have got as much torque in a little can such as an RC motor with a permanent magnet though.

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

Serum · 02:17 PM

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.

Procharged5.0 · 12.11.2006, 02:30 PM

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.

Serum · 12.11.2006, 02:32 PM

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

Procharged5.0 · 12.11.2006, 02:34 PM

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

Serum · 12.11.2006, 02:42 PM

Don't feel obliged! Please don't.

Procharged5.0 · 12.11.2006, 02:54 PM

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

Mikey · 12.11.2006, 07:00 PM

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.

zeropointbug · 12.12.2006, 12:30 AM

Quote:

Originally Posted by Mikey

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?