slots? Lehner? Plettenberg?

I was surfing the Lehner site for some info on how many slots their motors have, but I couldn't find anything. So, I was wondering, how many slots do Lehners, Plettenbergs and Hacker's have?

[snellemin]

Lehner and Hackers are 2 pole slotless motors. I don't have a plettenberg at hand to count the slots.

[lincpimp]

The pletts vary, 4 6 and 8 slots depending on model. Hacker and Lehner are 2 pole slotless as Snell said.

Some motors claim a 50% boost rate in power with 4 poles as opposed to 2.

Also, where are the slots and poles located? Got any info on hand where I can read up on the meaning of poles and slots?

[George16]

The number and size of slots depend uponmotor requirements. The slot has to be large enough to hold the correct number of conductors but at the same time, the tooth has to be large enough to pass the necessary magnetic flux. Normally, in a simple winding, there are as many coils as there are slots. This means that each slot contains two coil sides, one side of each coil being at the top of a slot and the other at the bottom of a slot. Each coil may consist of one or more turns depending on the applied or generated voltage of the unit.

[simplechamp]

Originally Posted by Dj_Sparky

Some motors claim a 50% boost rate in power with 4 poles as opposed to 2.

There was a post in the Castle section by Pdelcast where he was explaining 2-pole vs. 4-pole. What I got from it was 2-pole are good at winding up real quick and very high RPM, but lacking in torque. 4-pole are a little slower to spin up and lower RPM but have much more torque. He said 2-pole is fine for some applications, but for 1/8 or 1/5 scale a 4-pole is more suitable as it can provide the torque needed to move a heavier vehicle.

[BrianG]

I believe that discussion was geared more for slotted vs slotless...

Ah, ok, thank you all! :)

Now, what are poles?

[suicideneil]

Magnets on the shaft essentially.

A 2 pole motor typically has a cylindrical magnet with one north & one south pole on opposite sides.
A 4 pole motor tends to have 4 separate magnets glued to the shaft, going N-S-N-S around the shaft. Same deal really with 6 & 8 pole rotors, just more magnets.

http://www.stefanv.com/rcstuff/qf200212.html How motors work


2pole


4 pole ( kinda hard to see the magnets as the rotor is wrapped in kevlar, but you can just make out the face of each magnet, and you can also see the slots inside the can )