Re: Motors: Past and Future
 

Wow, that's a nice gokart. Really simple design too.

Re: Motors: Past and Future
 

Sorry, I missed this.

In the RC community the word cogging is used, and it's a misnomer. It refers to a non-sensored motor being able to start due to the static load being too high. These ESCs generally chase through the phases and assume the motor starts then measure back EMF to com mutate after. If the motor was sensored and properly communicated through this time it'd be capable of starting.

The actually definition of cogging is the torque ripple from the specific arrangement of the magnets.

Re: Motors: Past and Future
 

Thanks!
If you want more information check out: http://www.instructables.com/id/Chib...iature-Electr/

Re: Motors: Past and Future
 

Going back into my mental archive, CIMs were first in the 2004 KOP. The 2003 KOP was the first "KITBOT" chassis with the large aluminum tubes and still had the drill motors because of the funky injection molded black plastic drill motor mount.

Re: Motors: Past and Future
 

CIMs were definitely in the 2003 KOP just not a part of the kit chassis design. We custom built a gearbox for the CIMs for our rear wheels and used the drill motors and the weird plastic right angle helical gearboxes for the front wheels.

I'm not sure about before 2003 since I wasn't on the team before then and they weren't on the previous year's robots my team had built.

Re: Motors: Past and Future
 

CIMs were on the 2003 KOP checklist but not the 2002 checklist

• 2002
• 2003

Re: Motors: Past and Future
 

Isn't the "Chiaphua motor" the CIM by a different name? I seem to recall seeing CIMs referred to by this name in a lot of older documents, like Dr. Joe's "Nothing but Dewalts" paper, for example.

Re: Motors: Past and Future
 

Yes, if I'm not mistaken CIM stands for Chiaphua Industrial Motor or something along those lines.

Here is the debate from 2003.

http://www.chiefdelphi.com/forums/sh...ad.php?t=21339

Anyone still calling them Atwood motors?

Re: Motors: Past and Future
 

I'd forgotten about that.
Here's the 2001 KOP checklist. Please check it, but I don't see the Chip listed.
2001

Re: Motors: Past and Future
 

Back in the day we called them "Chalupas". Please remember that these are designed as intermittent duty motors for lifting trailer tongues onto hitches. They are sealed to provide some weather proofing. The drill motors were discontinued because they were replaced with another design.
Magnets, Rich is a motor guy by day and my motor reference person. when he speaks, listen. I am thinking we ran two CIM and two FP motors on that drive system. They were obviously geared differently. At that time, both the drill and FP motors suffered from low RPM, high current designs. What complicated things, as the temperature began to rise, the fan actually fell off the shaft or simply melted. Then it was a simple matter of thermal runaway. For some reason, drill motors also had a nasty habit of emitting flame when they failed.

Re: Motors: Past and Future
 

So...flame is what makes motors work, right? Somewhat like how electronics work on magic smoke?

Re: Motors: Past and Future
 

Since they've been brought up, how well do brushless motors work at stall torques and low RPMs?

Re: Motors: Past and Future
 

RC brushless motors essentially won't work in this condition. Due to how they are commutated from a standstill their stall torque is very low.

Sensored industrial brushless motors work great.

Re: Motors: Past and Future
 

They do.

And there have been instances of lower cost, higher production quantity brushless permanent magnet motors -- their application in automobile power steering systems is a good example. That application first went to serial production more than fifteen years ago, and is now made by several of the world's most capable suppliers.

For many years I have thought that the FRC kit of parts is one of the best showcases for introducing new components with good potential to displace legacy technologies. Low cost brushless motors and their associated controllers have that potential.

----

@Michael: motors are electromechanical devices. Their proper operation requires containment of BOTH smoke and noise -- if either of these escapes the motor, bad things happen. ;)

Re: Motors: Past and Future
 

Have any of you used the snowblower motor this year? I saw that it was added, but I hadn't heard much about it.