hacker and lehner motor question

[pinkpanda3310]

Originally Posted by What's_nitro?

To elaborate a bit-

Slotted motors have the stator coils wrapped through steel laminations (similar to a brushed motor) and the magnets on the rotor get caught at precise points where the poles of the rotor magnets align with the poles of the steel laminations (determined by the # of poles on each).

Slotless motors do not have the steel laminations in the stator coils so there is nowhere for the rotor magnet's poles to get caught on as it turns and so it rotates smoothly by hand.

Does that mean on a 4 pole the '4 poles' will align with the stator at once and the 2 pole will only align 1 at a time?

OR a slotted motor just has more magnetic pull when not in use?

[zeropointbug]

Like 'What's Nitro' post, a slotless does NOT use iron in there stator (windings), instead relies on on the greater amount of 'turns' (think 7xl ,or 8xl...) to produce a certain level of impedence/inductance, hence Kv.

A slotted motor like the Neu's use iron(laminated) in the stator to produce impedance/inductance, and also need fewer 'turns' of the windings to produce a given Kv.

[pinkpanda3310]

Originally Posted by zeropointbug

Like 'What's Nitro' post, a slotless does NOT use iron in there stator (windings), instead relies on on the greater amount of 'turns' (think 7xl ,or 8xl...) to produce a certain level of impedence/inductance, hence Kv.

A slotted motor like the Neu's use iron(laminated) in the stator to produce impedance/inductance, and also need fewer 'turns' of the windings to produce a given Kv.

So it's only wire thats makes up the stator in a slotless, hence no magnetic pull in any direction ( no notchy feel )

[zeropointbug]

Yes, wire and some dividers(structure) I believe. IIRC, the coils are overlapped slightly differently as well, but don't quote me on that.

[BrianG]

Originally Posted by zeropointbug

Yes, wire and some dividers(structure) I believe. IIRC, the coils are overlapped slightly differently as well, but don't quote me on that.

There is a "core" in a slotless stator as well, but it's a long toroid against the motor can, kinda in the shape of a long donut. You can kinda see what I'm talking about in the pic I took of a Feigao I cut in half:

[What's_nitro?]

Originally Posted by pinkpanda3310

So it's only wire thats makes up the stator in a slotless, hence no magnetic pull in any direction ( no notchy feel )

Yes. There is no steel in the stator of a slotless motor so there is nowhere for the rotor poles to "latch on".

[What's_nitro?]

Originally Posted by pinkpanda3310

Does that mean on a 4 pole the '4 poles' will align with the stator at once and the 2 pole will only align 1 at a time?

Not necessarily. Like I said, the number of "notches" you feel in a slotted motor is determined by the number of rotor poles and the number of stator slots.

In the case of a Neu motor (15 series), it has a 12 slot stator and a 4 pole rotor. This motor has 12 notches that you can feel when you turn it. Since the # of poles can divide into the # of slots resulting in a whole number, the number of notches is equal to the number of slots. This works every time. IF you have a motor with say 6 poles and a 12 slot stator you will still feel 12 notches. If you have 4 poles and a 24 slot stator you would feel 24 notches.

AS far as 2 pole slotted motors (Novak, LRP, all the ROAR BL motors) they use a 2 pole rotor and a 3 slot stator. In this case the motor has 6 notches because only one rotor pole can align at a time- 2 poles * 3 slots = 6 notches. I'm not sure if this multiplication method works for any other type of motor. It is just my observation.