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Most of my drives are shaft drives.

Iron

Viewing from archive

Iron

Thank you for pointing that out 78RPM. We'll get that fixed.

Thanks everyone. See you tomorrow.

 

Blogger

I think, this is it for today!

Good night for me, have a nice day to you all

Urs

Blogger

Thanks Urs, I'll keep that in mind when watching your excellent broadcast, tomorrow.

Honestly, I don't think it makes sense. You will see tomorrow that many motors can be overloaded quite a bit => the high torque for starting is not a problem.

Blogger

JUST CONCEPTUALLY:  a load driven by clutchs or belts with slipage.  Two motors have individual belts/clutches to connect in parallel to the load.  One motor may provide startup torque while the other provides higher torque at higher steady state speeds.

@ purchasemail

What do you mean by combining?

Blogger

Urs, does it ever make sense to combine 2 types of drives or motors in a way the each compensates for the other's pros and cons?  For instance initial high torque from one source and steady state torque from another?

I'm looking forward to tomorrow's session, but I gotta get back to work now.  Thanks again, Dr. Kafader!

Iron

Stepper Motor:

When selecting stepper motors, it is important not to look at the motor alone but also at the capabilities of the driver (current).

Essentially the selection steps for stepper or any other motor are the same. Particularly, analyse in detail the acceleration process and the mass inertias. That's where steppers might come to a limit, unless you select a more powerful one (overload capacities of steppers is limited)

Blogger

you're welcome, and thank you all. . . Choos

Iron

Thanks to 78RPM and jzap74 for great suggestions, and to Urs for the guidelines.  All very helpful.

Belt drives cover many applications and I have had to design various appliocations such as for coolig fans, moving materials in agricultural applications and finally now moving a load carrying platform for selecting and moving materials.

Each has its own challanges.

Don't forget to look at the Educational Resources in the column to the right of this chat.

Gold

efunda.com is a good source for drive design

Iron

Guidlines for the use of belt drives:

- maximum load of belt. Select width accordingly. Check manufacturer's specs

- pulley diameter should be larger than minimum curvature of specified beld

- belt tension and radial bearing load

- play and elastic response in dynamic applications

- electrostatic charging

Blogger

Does anyone know of an on-line resource that discusses and analyzes different drives like those shown in slide 16?

Thanks URS , Very good lecture, but if you go to scienc news researchers have found a way to networh 16 processers , which they say gives them the same computing power as our brains. this may have applications for robotics.

Iron

@Urs great presentation and a Like your notes at bottom of each slide. It helps a lot due to some audio problems.

Iron

Thank You Urs & Rob!

Iron

Danke viel mal Urs!

Iron

Thank you Urs. This presentation will exactly fit what I am looking for in mentoring FIRST robotics students in their projects.

 

Urs can you tell me how to select a Stepper Motor ?

What are the  various features and parameters I need to look into for a particular Electromechanical Project ?

Thanks, very useful

 

Iron

It was a pleasure.

I liked all your responses to the belt question. There is a lot to consider, indeed.

But note that often toothed belts are used for small drive systems.

 

Blogger

Thank you for your time Urs and Rob.

Thank you Urs & Rob

Iron

Thank you Dr. Kafader, Design News, and Digi-Key

Gold

Thank you Urs and Rob!

Iron

Thanks Urs, Rob, and Digi-key.

Iron

what are the guidlilnles to use conveyor belts

 

Iron

Thanks, this has been a good overview/reminder. Looking forward to the next two sessions.  I've enjoyed the images of the applications.

Iron

We're now on slide 27.

Blogger

response lag can be an issue

We're now on slide 25.

Blogger

Precise movement requires timing belt or similar - otherwise, there could be slippage that affects actual versus desired movement.

Iron

friction, and belt elasticity.

Iron

Since they can slip when overloaded, belts may be a nice safety feature

Iron

vending machines are loud!

Iron

limited experience with belt drives

We're now on slide 24.

Blogger

Belt and conveyor drive systems allow flexibility in positioning between drive components.

Iron

resilience and robust response to the load

 

Iron

Belt drives....  sometimes not precise....

Iron

belt drive on vending machine application

Iron

On belt drives, there is sidways pull on the shaft. Belts can stretch.

Gold

belt tension in respect to slippage

 

Iron

We're now on slide 23.

Blogger

Friction seems to be higher with belts

 

Iron

load and friction

 

Iron

Questions from Urs:

Please post your experiences with belt drives or conveyor belt applications. They have some features that might be interesting for everybody.

Blogger

We're now on slide 22.

Blogger

We're now on slide 21.

Blogger

We're now on slide 20.

Blogger

@fred45...  Thanks for that info!

Iron

We're now on slide 18.

Blogger

We're now on slide 17.

Blogger

We're now on slide 16.

Blogger

Note that Urs has a lot writing notes in the bottom window, for all of you who have audio problem.

Iron

We're now on slide 15.

Blogger

We're now on slide 14.

Blogger

hi Urs. good afternoon from boston. Sorry I am late,

sources and characteristics of available power vs. those needed by the drive system

 

Iron

for electrical power - response when voltage drops too low for normal processing

Iron

Reduce power losses through-out the overall system to insure max power at the load

 

Iron

Heat and efficiency.

Iron

Consistent power, as load changes...

Iron

for power flow, consider whether PCB foil is adequate to handle current and how long the foil paths can be.

Gold

We're now on slide 13.

Blogger

Question from Urs:

What do you think are important aspects concerning power and power flow?

Blogger

ok, i got it now

i logged in again

Iron

FWIW, the audio comes from cinchcast.com, so if you have blockers, you need to enable that URL

Gold

We're now on slide 12.

Blogger

I heard it today on both IE and Chrome.

Iron

@Vijee

Check that java, flash and other aren´t blocked (or installed)

Iron

Audio is via Adobe Flash Player, so that must work on your system to hear audio.

 

Iron

I had to switch to Firefox to get the audio

Iron

I can see it and hear it.

Iron

what's the issue, y we are not able to see the audio bar

 

Iron

I can download the slide deck, but cannot see the audio bar or hear the audio. Please send me the archived link to watch it live after the live session is complete. 

@dschwobe - The class will be archived on this page immediately following the class. You will just need to hit the play button on teh audio bar after the class ends.

We're now on slide 11.

Blogger

@dschwobe

You can follow the recording of season, just when it end.

Iron

We're. now on slide 10.

Blogger

  torques, inertias

Iron

Can we recieve the archieved version after the presentation as I am not hearing it nor am I seeing the audio bar ?

 

Iron

We're now on slide 9.

Blogger

sense when a motor has stalled from lack of torque

Gold

We're now on slide 8.

Blogger

to get as close as posible to real time response.

Iron

We're now on slide 7.

Blogger

Precise movement/stopping.

Iron

motor speeds, torque, loading

Iron

I can't understand what he is saying

Iron

that's what we do here at RedZone Robotics!

Iron

Question from Urs:

What do you think are typical challenges for motors and drive systems in such applications?

Blogger

We're now on slide 5.

Blogger

Rob - can you please ask Urs to hold the microphone closer, or something?

Iron

We're now on slide 4.

Blogger

 If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

audio is live - but muffled....

 

Iron

I do not see the audio bar.

Iron

We're now on slide 2.

Blogger

Urs is calling in from Switzerland so you may need to turn the volume on your computer all the way up to get the best sound quality.

Do others see the audio yet?

Gold

We're now on slide 1.

Blogger

Hello from Albuquerque.

Hi Urs. How is the weather in Zwit.?

Iron

Hello from Montana

Gold

Hello from Albuquerque, NM.

Iron

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Hello from Danvers, Massachusetts!

Iron

Hello from Cape Cod!

Kurt

Iron
3 minutes until the class starts! Make sure to download the slide deck from the link that says "today's slide deck" above.

 

Blogger

Hi from Switherland

 

Blogger

Hello from Albuquerque.

Iron

Hello from the Steel City, Go Pens!!

Iron

Hi from "The Land of the midnight sun".

Iron

-The streaming audio player will appear at the top of this web page when the show starts at 2 PM Eastern time today. If the audio doesn't start automatically, click on the play button to start it. Note however, that some companies block live audio streams. If when the show starts, the audio bar doesn't appear or you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. Also, make sure your flash player is updated with the current version. If that doesn't work, your company is likely blocking the live stream. The class will be archived immediately following our live taping and you will be able to listen to it then. You shouldn't experience any problems with the audio when listening on-demand.

Blogger

Hello, from Manizales - Colombia.

Hi from snow in Montana
Iron

Hello everyone - Urs is calling in from Switzerland so you may need to turn the volume on your computer all the way up to get the best sound quality.

Blogger

Hello from Santa Monica, CA

Hello from Chicago

Iron

Greetings from Atlanta, Georgia

Iron

Greetings from Toronto, Ontario.

@ucschmidt - We're working on replacing the PPTX with a PPT file. I'll let you know when the PPT version it live.

good afternoon from Detroit, Michigan

Hello from Pearland, TX... see you at 1:00 CDT

Iron

Howfro Tomball, TEXAS!

Iron

Is there any chance of getting the slides in ppt instead of pptx format.... not everyone can justify a new MsOffice every year. Especially since 2003 has a better user interface.

Iron

I didnt mean like THE objetive of the courses, more like the main theme. Robotics? Drivers? Software? electronics? Sensors and actuators? Well but thanks anyway!

@FerTrujillo - The objective is to learn! :)

of course Guadalajara Mexico.

The tequila city haha

@FerTrujillo

Guadalajara, MX?

Iron

Good afternoon from Valladolid, Spain.

The sun come back.

Iron

hi there from Guadalajara!

Whats the objective of this courses? Still taking them nontheless the answer, just so I prepare myself for whats coming!

@chetan.chavhan@igate.com - To register for the course, you need to click on the "View the Full Curriculum Calendar" link above and then click on the "sign me up" links that are next to the class descriptions on that page. You need to sign up for all 3 class days to attend them all.

 

-Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

Chetan, it looks like you have joined. The program begins at 2:00 Eastern today.

Blogger

Hello from Albuquerque, New Mexico.

 

Blogger


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