How Slow can you Go? ... Bit of Fun.

[Colin_McLeod]

Do you do box opening videos? 

 

 

Just joking atom3624

[boxbrownie]

What controller are you using Atom?

[The Johnster]

18 hours ago, atom3624 said:

with 'super slow' operation that there's a distant 'buzzing - whether it's a Dapol 68, Bachmann 25 or 47, Hornby 56, 60 or 'Kettle'.

This is probably further evidence of 'cogging'; the motor stops temporarily while it builds sufficient electro-magnetic force (EMF) to overcome friction. and vibrates, causing the hum.  Heat builds up during this period.  Once sufficient EMF to move the motor has built, the commutator moves one segment at a time and then stops as the next segment aligns with the magnet, and the process repeats itself.  The reason it doesn't happen at higher motor speeds is the inertial weight of the commutator, sometimes helped by a flywheel.  You probably won't do your motor much harm with this practice, but you certainly won't do it any good!

 

Cogging is an indicator of good pick up and efficient transmission, but is not true smooth realistic controlled slow running.

[atom3624]

Totally agreed.

 

Very obvious in the higher performance R/C car/truck motors when raising the gearing to get higher speeds.

If 'cogging' is obvious, you drop the gearing down until it's smoother.

 

That's why I've regularly mentioned 'feeling for heat' with intention to abort - it's obviously not good practice.

 

Al.