Carbon-sleeved Rotors

[Kitchenchem]

Here’s an interesting article that can give light to the carbon-sleeved rotors on the Model S Tri motor.

https://www.drivesystemdesign.com/wp-content/uploads/2020/03/Research-Review-Composite-Rotor-Sleeve.pdf

 

[Kitchenchem]

Tesla web sight.

 

[sillydriver]

Very interesting find.

 

[Darmie]

... and more here.

https://www.calnetix.com/sites/default/files/2020-04/Rotor%20Retention%20and%20Loss%20Reduction%20for%20High-speed%20PM%20Motor%20Generators.pdf

 

[rooter]

Actually Tesla winds carbon-fiber filaments around the rotor with very high tension, rather than pressing on a carbon sleeve. This holds the permanent magnet rotor together at very high speeds, even given the very different coefficients of expansion for ferrous materials vs carbon-fiber.

 

[Kitchenchem]

Yes, I think Tesla has taken it further. Do you think Plaid is capable of 30,000 RPM?

 

[gearchruncher]

Do you think Plaid is capable of 30,000 RPM?

No, it's not.

Rear axle is a ratio of 7.5:1. With 26.5" diameter tires, this is 19,000 RPM even at 200 MPH.

30,000 RPM would be 2.5X more force on the rotor (it's square vs RPM).

 

[ronsetera]

Yes, I think Tesla has taken it further. Do you think Plaid is capable of 30,000 RPM?

In one to two years...

 

[slainla]

I can't find any wear information so hopefully the carbon sleeve won't fail prematurely or catastrophically.

And if it does, Tesla better not come out saying it is normal wear and tear.

 

[gearchruncher]

I can't find any wear information so hopefully the carbon sleeve won't fail prematurely or catastrophically.

How would you expect to find any information on "wear" on a part that has been out for about 2 weeks?
This sleeve doesn't touch anything, so "wear" is not the general term that will be used. Fatigue would be the issue here. Thankfully, composites tend to be very good in fatigue.

And if it does, Tesla better not come out saying it is normal wear and tear.

If the sleeve fails at 20,000 RPM, you're going to be very lucky to be around to have a discussion with Tesla about your warranty status

 

[slainla]

How would you expect to find any information on "wear" on a part that has been out for about 2 weeks?
This sleeve doesn't touch anything, so "wear" is not the general term that will be used. Fatigue would be the issue here. Thankfully, composites tend to be very good in fatigue.


If the sleeve fails at 20,000 RPM, you're going to be very lucky to be around to have a discussion with Tesla about your warranty status

I wasn't referring to the production vehicle but rather tests Tesla or others have performed. I don't know all the technical terms but since the process seems so scientifically advanced, I wanted to find information on potential life cycle and whether heat or other stresses would affect the motor.