Breaking/Coasting and Jaguar and Talons.

[mgerber]

Originally Posted by eMorr

2) In addition to my searches on the Talon. My team used until now the Jaguars motor controllers. Is there more pros in Talon than the Jaguars? What are they?

In terms of linearity and motor control, the Jaguar is sliiightly better than the talon, but both are superb compared to the old 884s. Jaguars allow you to use CAN and all the cool features along with it. However, Jags are often seen as less robust.

Talons are brand new this year, and I'm not too sure how they'll hold up over the course of the season. However, they do have very nice linearity and also have the benefit of being completely debris proof. Because of the smaller robot body size this year, Talons are going to be much easier to find space for.

Motor Controller Profiles

[Ether]

Originally Posted by mgerber

In terms of linearity and motor control, the Jaguar is sliiightly better than the talon

Would you please explain what you mean by this?

[mgerber]

Originally Posted by Ether

Would you please explain what you mean by this?

According to the experiment performed by Team 2928, Jaguar top speed and Jaguar reverse speed are identical. Talon top speed and Talon revese speed are not. In addition, the Talon motor profile shows much more noise towards relative minimum and maximum points than the Jag does.
I assumed that more percise speed control would make for better driving, especially while turning. Did I miss something in making this assumption?

[Ether]

Originally Posted by mgerber

According to the experiment performed by Team 2928...

Those tests are interesting, but they were run with essentially no load (except windage and vibration) so they really can't be used as a motor control metric for loaded applications.

Also, most of the things you noted are likely just due to sensor noise and decoding. If you look at the Victor graph, you can clearly see the quantization in the sensor readings.

Look at the time and RPM scale on the graphs and you can get a ballpark idea of the amplitude and frequency of the noise. Compare that to the physical system under test.

Under load, Talons and Jaguars are both quite linear.

[mgerber]

Originally Posted by Ether

Those tests are interesting, but they were run with essentially no load (except windage and vibration) so they really can't be used as a motor control metric for loaded applications.

Also, most of the things you noted are likely just due to sensor noise and decoding. If you look at the Victor graph, you can clearly see the quantization in the sensor readings.

Thanks for pointing that out, I hadn't knoticed that before. I'll be sure to make sure I know what I'm talking about next time I go around dispencing advice.