Setting RPMs on motors

[bhsrobotics1671]

Originally Posted by Ether

Have you successfully done this?

We have!

[Ether]

Originally Posted by bhsrobotics1671

We have!

With a drivetrain too? Or just a free-spinning wheel?

[pfreivald]

Our plan is to use the kit encoders direct-mounted to our flywheel shafts. Does anyone know if the manufacturer claim of up to 10,000 rpm is accurate? We'd rather not add the weight, complexity, and inefficiency of having to gear down an idler for the encoder to take rates.

[hsekhon27]

Just the wheel

[carrillo694]

Originally Posted by Ether

Have you successfully done this?

Define "success." We did it on our drivetrain last year, with each wheel being controlled separately, and tuned the values using BDC-COMM. Were we able to control the speed of the wheels comfortably? Yes. But we faced typical Jaguar reliability issues that led us to replace them with Victors + homebrewed speed control code.

[Ether]

Originally Posted by carrillo694

Define "success."

In this context, I guess I meant:

- did you measure the actual steady-state output speed and confirm that it was indeed equal to the speed you were commanding?

- was it stable?

- was the dynamic response "good"? (I know, define "good". How about a rough estimate of step response compared to voltage mode or %Vbus mode)

- for a given speed command, did the controller hold the same output speed under different loads?

The reason I ask is that if you were successful, the folks at this thread would like to hear about it:
http://www.chiefdelphi.com/forums/sh...d.php?t=100135

[davidthefat]

You can use a PID Controller and use RPM as the unit.

[Ether]

Originally Posted by davidthefat

You can use a PID Controller and use RPM as the unit.

Your post is shown in the "threaded display mode" as being a response to my post#14. Was that intentional or inadvertent?

[davidthefat]

Originally Posted by Ether

Your post is shown in the "threaded display mode" as being a response to my post#14. Was that intentional or inadvertent?

Unintentional; I just use the "quick reply" button, so I just click the closest one.

[Ether]

Originally Posted by davidthefat

I just use the "quick reply" button, so I just click the closest one.

Friendly suggestion: You might want to rethink that habit. Without any context in your post, the only clue regarding what you are responding to is the hierarchy in the threaded display mode.

[RyanN]

Heck, with CAN now fully going and err... reliable?... you can use the Jaguar's Speed interface to control RPM.

It's legal this year, and it takes some of the overhead out of the programming, as well as making it respond better.

Just an idea.

I think Team Fusion is going this route.

[Ether]

Originally Posted by RyanN

you can use the Jaguar's Speed interface to control RPM.

http://www.chiefdelphi.com/forums/sh...84&postcount=5