Team BKool CycleChat

[gbrown]

Aside from that, Bkool was in a very generous mood today and come to think of it, the last time that happened was also in the living room. So maybe it's the temperature that makes the difference, or it's something with the particular BSim installation on my living room media center.

The resistance will definitely be temperature related, as temperature is a factor in eddy current braking. Without following all the physics, it seems there is also a temperature coefficient of resistance, meaning the rotor will have a different resistance at different temperatures.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-12/temperature-coefficient-resistance/

Only understood about one word in ten, but it is clear that temperature will definitely effect magnetic braking.

Also, I would think that in a cold ambient temperature the resistance would reach greater levels, as heat dissipation would be greater, in a warmer environment I would expect the resistance to max out sooner.

Geoff

 

[LBHIFI]

IT doesnt matter any more. Pep just took 39 sec off my time

39 seconds?
Looks like pep did a shoot load of sessions today, but isn't his best result in WC7 beating you with only 4 seconds?

 

[bobinski]

The resistance will definitely be temperature related, as temperature is a factor in eddy current braking. Without following all the physics, it seems there is also a temperature coefficient of resistance, meaning the rotor will have a different resistance at different temperatures.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-12/temperature-coefficient-resistance/

Only understood about one word in ten, but it is clear that temperature will definitely effect magnetic braking.

Also, I would think that in a cold ambient temperature the resistance would reach greater levels, as heat dissipation would be greater, in a warmer environment I would expect the resistance to max out sooner.

Geoff

Have I told you how frigging cold my loft is?

 

[kipster]

Have I told you how frigging cold my loft is?

I've heard it's so cold it can hurt knees

 

[LBHIFI]

The resistance will definitely be temperature related, as temperature is a factor in eddy current braking. Without following all the physics, it seems there is also a temperature coefficient of resistance, meaning the rotor will have a different resistance at different temperatures.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-12/temperature-coefficient-resistance/

Only understood about one word in ten, but it is clear that temperature will definitely effect magnetic braking.

Also, I would think that in a cold ambient temperature the resistance would reach greater levels, as heat dissipation would be greater, in a warmer environment I would expect the resistance to max out sooner.

Geoff

Looks like a 30 C difference could make a difference.

 

[bobinski]

update on my cold - in 24 hrs it has turned to full scale man flu and i fear i have the beginnings of bubonic plague - at this rate i fear that not only am i going to miss the handicap this week i may well be dead by thurs
if this is the case being of reasonably sound mind i leave fellow cyclechatters my bkool to harvest for parts and also i leave Bob my right knee - bear in mind though i am only 5'7 so you may find yourself walking round in circles by accident
have fun

I'll take it! Anything is better than the one I have now. You are white European Caucasian?!?

Sorry to hear about the plague

 

[AAAC 76C]

Could be this one with a threaded shaft added.
This was about £7.

My original Classic came with a Portescap stepper Pt No 42L048D2B.
There are customisation options and the specs can be found in the below link.
The bronze threaded shaft is held on by a small Allen key grub screw and so could be fitted to a replacement motor:
http://www.portescap.com/products/can-stack-motors/42l048d-can-stack-stepper-mini-motor.

The one off of my hybrid was of Asian origin however Portescap do manufacture in 'the East'.
The Pt No is 42BY48LD010-02
I can't seem to find anything on that Pt No.

 

[Daddy Pig]

The resistance will definitely be temperature related, as temperature is a factor in eddy current braking. Without following all the physics, it seems there is also a temperature coefficient of resistance, meaning the rotor will have a different resistance at different temperatures.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-12/temperature-coefficient-resistance/

Only understood about one word in ten, but it is clear that temperature will definitely effect magnetic braking.

Also, I would think that in a cold ambient temperature the resistance would reach greater levels, as heat dissipation would be greater, in a warmer environment I would expect the resistance to max out sooner.

Geoff

So in that case I'll stick my fan heater on full whack aimed at the turbo and have a cooling fan for myself.
Not sure how much a small rise in temperature would have, but at least we know why @AAAC 76C does so well... it must be all that hot air

 

[bobinski]

I've heard it's so cold it can hurt knees

You mean I could lose the left one too?!? "Gulp"...

Berty, can you ask your next of kin to hold onto the left one too? Cheers mate

 

[LBHIFI]

My original Classic came with a Portescap stepper Pt No 42L048D2B.
There are customisation options and the specs can be found in the below link.
The bronze threaded shaft is held on by a small Allen key grub screw and so could be fitted to a replacement motor:
http://www.portescap.com/products/can-stack-motors/42l048d-can-stack-stepper-mini-motor.

The one off of my hybrid was of Asian origin however Portescap do manufacture in 'the East'.
The Pt No is 42BY48LD010-02
I can't seem to find anything on that Pt No.

Same in mine.
FYM has some that looks similar. They state that "We can develop customer design version", so it's probably a Bkool version.
http://www.fym-motor.com/mm-pm-stepper-motor-20.html

 

[AAAC 76C]

My original Classic came with a Portescap stepper Pt No 42L048D2B.
There are customisation options and the specs can be found in the below link.
The bronze threaded shaft is held on by a small Allen key grub screw and so could be fitted to a replacement motor:
http://www.portescap.com/products/can-stack-motors/42l048d-can-stack-stepper-mini-motor.

The one off of my hybrid was of Asian origin however Portescap do manufacture in 'the East'.
The Pt No is 42BY48LD010-02
I can't seem to find anything on that Pt No.

I think the later one comes from:
http://www.baolai-cn.com/en/product...=195&pid=182&gclid=CNK9o4bgjdICFW4R0wodMvkLUw

 

[LBHIFI]

39 seconds?
Looks like pep did a shoot load of sessions today, but isn't his best result in WC7 beating you with only 4 seconds?

Ha, i wrote "s*h*i*t load" without the stars but it automatically got changed to "shoot load"

 

[LBHIFI]

I think the later one comes from:
http://www.baolai-cn.com/en/product...=195&pid=182&gclid=CNK9o4bgjdICFW4R0wodMvkLUw

Looks very much like the one.

 

[<Tommy>]

The resistance will definitely be temperature related, as temperature is a factor in eddy current braking. Without following all the physics, it seems there is also a temperature coefficient of resistance, meaning the rotor will have a different resistance at different temperatures.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-12/temperature-coefficient-resistance/

Only understood about one word in ten, but it is clear that temperature will definitely effect magnetic braking.

Also, I would think that in a cold ambient temperature the resistance would reach greater levels, as heat dissipation would be greater, in a warmer environment I would expect the resistance to max out sooner.

Geoff

So for optimal performance we should ride with the trainer in the oven while simultaneously sticking our heads in the fridge. Got it!

 

[LBHIFI]

Have I told you how frigging cold my loft is?

Bob, if you haven't already got fake teeth, a hard earned advice from here is to put your protein bar in the back pocket as to warm it up.