[Arlo]

Yeh at those rpms there is a fair bit of eddy current losses and then you have hysterious losses and bearing losses and colossus has a 80x100x10 mm skirt bearing (the new version is smaller). So 700watts at those rpm with all the air moving is no big deal!

[circuit]

Originally Posted by frodus

That's not 700W of loss, that's 700W going to the controller. Just because it's not loaded doesn't mean it's not doing work. The motor is still moving and using energy.

A 5W fan is doing more work than spinning colossus. Think about it.

[Coulomb]

Originally Posted by Arlo

And the Tritium wave sculpture but the pages can not be found???

I don't know what pages you mean; if the AEVA pages, yes the server is rather unreliable.

In the Honda Civic Conversion, they added 3 400 A 50 uH inductors in series with the ironless motor.

[Arlo]

Originally Posted by circuit

A 5W fan is doing more work than spinning colossus. Think about it.

I would put money on colossus unloaded lol. Its moving a lot of air and more then a 5w fan would be. But at ~7000 rpm is has big eddy current losses. If I lowered it to ~ 4000 rpm then the unloaded current draw is less.
OH and one big thing we forgot colossus is NOT using the whole 700watts the controller has its losses too!

[Arlo]

Originally Posted by Coulomb

I don't know what pages you mean; if the AEVA pages, yes the server is rather unreliable.

In the Honda Civic Conversion, they added 3 400 A 50 uH inductors in series with the ironless motor.

Yes its working now. http://www.tritium.com.au/products/TRI50/index.html