Is Slotless Motor Slower Than Shinkansen Motor?

[changkh]

Have been inactive for some time.

 

Due to Doctor Yellow being retired in Japan, am thinking of purchasing one and it happens that Kato will re-releasing in June. I noticed something new mentioned in the poster - slotless motor installed.

 

As I have no idea what this was, I tried to find some videos about this motor. One particular video which I embedded, mentioned that this motor is meant for normal trains and if replaced on a shinkasen train, the speed will be slower.

 

Since this is a 3 year old video, not sure if it's still valid anymore. My current trains are already running slower after changing to the latest power packs so if this motor makes it slower, I might get one of the older models without slotless motor instead.

 

https://www.youtube.com/watch?t=125

[nscalestation]

I had not heard the term "slotless motor" before so I looked it up.  It refers to how the windings are done and is supposed to provide smoother and quieter operation.  Don't know if it will be any different speed than previous motors used on Kato products.

[chadbag]

Is this different than “coreless”?  A lot of manufacturers have started using careless motors.  The ones I have have not been slower than the same manufacturers older traditional motors though if you are using DCC sometimes there are some settings recommendations by the decoder makers for coreless motors.  

[cteno4]

Well I was curious about that a while back and looked it up and just had to go back to refresh the neuron pathways.

 

They are slightly different. A coreless motor is slotless, but cordless don’t have an iron stator, but slotless motors still have an iron stator core. Coreless motors have their windings done in a thin walled cylinder, not around an iron core. This cylinder surrounds a magnet core (coreless referees to no iron stator core). The designs are similar just slightly different flux path to work. But i saw some diagrams of slotless motors that looked like other diagrams of coreless motors…

 

But I think maybe in model trains there maybe some just misuse of the names as a cordless motor is by definition a slotless motor, so maybe why some are using the slotless term when it’s even more specific of being coreless with the motor designs used in our trains.

 

clear as mud? My brian hurts.

 

Jeff

[brill27mcb]

The slotless motor is different somehow from the coreless motor and the traditional "core" motor designs, because Kato was able to get a patent on it. It is somehow wound without having the usual slots in the core to wrap armature wires around to create poles.

 

Rich K.

[cteno4]

There are a lot of slotless motor designs out there. A coreless motors is slotless, this is where it gets really nitty on top of the over all motor design. Maybe the Kato is a slotless still with iron stators and not technically coreless.

 

Most specific ref i ran across

 

https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/iet-epa.2015.0188

 

jeff