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This is great - I'm glad I got back to it!

Iron

Good lecture wish I was here live.

Iron

Have use pwm but not in a motor application.

Iron

Have used something similar to QEI for control of linear motor in a disk drive application.

Iron

Have used resistive and optical, if I remember right ...256 counts per.

 

Iron

Congratulations very well explained and useful course. Thanks a lot.

Iron

Thanks a lot! Nice experience!

Iron

No use / make of QEI block

Paul,  Very informative.

Thank You!

Iron

Thanks a lot for this excellent class!

It is very slow with small step. I will use your way to testing if I need the braking res. Anyway i leart this from your lecture. Thanks a lot.

Iron

Thank You Paul, this course was very useful.

Iron

Thanks Paul, excellent week

Iron

Thanks a lot Pauln and MTait. The lens we order from outside lans manufacture. We control focus and zoom in or out.

 

Iron

TGIF everyone, Thanks for listening.

Hope to be back soon with another course.

Paul.

 

Blogger

Sherlock:  If you look at your total wattage produced during the brake of such a small power & inertia.  Then compare it to the total wattage of 2 of your H birdge transistors, the motor (which will take half the power by definition, and the wiring ... you are more than likely way in the green.  IMHO

 

Iron

How much mass is the lens?  What velocity

will it be travelling?  How rapidly do you wish

to decelerate it?  That's what we need to know

to answer your specific question.

Blogger

I thank lens moving is very slow so inertia very low. No need this bracking resistor, I am right?

Iron

The typical voltages to supply encoders varies.

5V, 12V, take a look at the spec sheets.  They

will produce some digital, CMOS, differential output.

If your sensor lines are long, and you want to run them

near the motor, then go differential.

Blogger

Lens just take 200ma at 12 volts. Need the braking resistor? I used H-bridge.

Iron

Question from rclipat:

 

What is the typical voltage supply used in encoder?

 

 

Blogger

thanks Paul and MTait. Just putting things away in my problem solving tool box for later. Time to go for now.

Iron

Back to the 5% comment:  Some time is

consumed in the dead time system, but as I said,

the primary reason we show 95% is the driver reason.

Blogger

Thanks Paul, good job picking up the key points.

Question from Markr:

 

Which NXP device are the datasheets taken from?

 

 

Blogger

Braking resistor.  If your mass (inertia) is low,

then you do NOT need it.  How many watts?

Unless you're moving a lens like that on KECK

you are probably ok.

Blogger

great lecture series

Iron

danlafleur:  It might be possible but keep in mind a motor is linear.  A pure magnetic solenoid happens on a "Q^4" th attraction.  It would take a fast system with a LOT of resolution to have a chance.  IMHO  Be safe

Iron

Oh yes, the principles of motor control can be

applied to power supply design and solenoid control.

Blogger

Question from MarEng:

95%, are you assuming that the last 5% is consumed by switching time and dead time?

 

 

Blogger

Have used PWM, but not for motor control, as in Slide 13.

Iron

I have a small question about braking resistor onlast lecture. what situation we need it? My one project is control a optical lens. It work on lower power and lens move slow. do I need it?

Iron

We have taken the block diagrams from

our favorite NXP LPC176x class and LPC175x

class Cortex M3 processors.

Blogger

No, have not used QEI block as in Slide 10.

Iron

Thank you Paul, Design News, and Digi-Key

Iron

thanks Rob and Paul for the interesting week.

@Paul, it appears that the brush DC motor control could also be used to control solenoid operation? open/close rate and responce to varying  pressure on a valve?

Iron

No, have not used position encoding.

Iron

We assume a maximum PWM Percentage of 95%

because many of the switch-mode-style FET drivers

cannot operate unless they are switching, thus 100%

duty cycle is NOT possible.  There are some drivers

that CAN do 100%, but again, most can't.

 

Blogger

Rob, Design news and DIGI-KEY thank you

Iron

Thank you very much for  the good lectures

 

Back from my meeeting, catching up.

Iron

Thank you Paul, Rob, Design News, Digi-Key and everybody!  :)  Fun week!

Thanks Paul.

Any recomended references for brushless DC control?

Francisco

 

Iron

Paul thank you for the lectures.

 

Iron

Good set of classes, Thanks Paul & Rob.

Iron

Paul, great review, thanks

Iron

thank you paul.  this was a great set of lessons

Iron

Thank you Rob and Paul for the great leacture.

Iron

Thank you so much Paul an Rob.

Iron

Thanks Paul.  Good info!

Iron

This was a very valuable session for me.  The details on QEI and PI in an ARM controller are interesting.  The older literature I have (including school back in the dark ages) does not have that information.

Well worth the 5 minutes over.  Thanks.

Future course?  Brushless DC would be helpful.

Iron

Thanks again Paul. Very informative.

Iron

Thank you Paul, Rob, and Digi-Key

Gold

Thank you for the presentation.

Iron

THanks  enjoyed very much

Iron

We're now on slide 22.

Blogger

We're now on slide 21.

Blogger

We're now on slide 20.

Blogger

We're now on slide 19.

Blogger

No, but I have used PWM to control motor speed.

Iron

We're now on slide 18.

Blogger

95%, are you assuming that the last 5% is consumed by switching time and dead time?

 

Iron

We're now on slide 16.

Blogger

We're now on slide 15.

Blogger

Yes I listen but never used it.

Iron

We have not used a QEI block (yet).  We have used PWM blocks.

Iron

Haven't used the PWM block yet, but I am aware of them.

Iron

We're now on slide 14.

Blogger

no PWM block used like on slide 13.

Iron

Paul's question:

Has anyone listening made use of a PWM block such as the one shown on slide 13.

Blogger

I used PWM, but not with an H bridge.

Iron

We're now on slide 13.

Blogger

? Which NXP device are the datasheets taken from?

Iron

Correction, Have nver used QEI block.

Iron

We're now on slide 12.

Blogger

No I have used a QEI block.

Iron

no QEI block here, still using "legacy" techniques.

Iron

We're now on slide 11.

Blogger

I had to do my own. It was simpler than this.

Iron

 Paul's question:

Has anyone listening made use of a QEI block such as the one shown on slide 10.

Blogger

No, Have not used the QEI Block

Iron

no never used a QEI block

Iron

No, have not used QEI

Gold

We're now on slide 10.

Blogger

Slide 8 looks like the encoder stopped and reversed.  2 leads 1 on the right of it and 1 leads 2 on the left.

Iron

We're now on slide nine.

Blogger

We're now on slide eight.

Blogger

Incremental encoder, with  4096 resolution per sycle

 

Iron

Yes, very different types:

Low Resolution - 32 Positions per Turn,

Incremental Encoder wit 1024 or 2048 Positions per Turn,

Absolut Encoder, Single Turn and Multi-Turn with up to 4096 Positions,

SinCos, Hiperface, ENDAT, BiSS, CANopen, ...

Iron

We're now on slide seven.

Blogger

we use quadrature encoder, 1cm resolution for large strorage tank gauging.

have also used it to determine cable length out or in on a winch.

Iron

Yes, Renishaw incremental encoder

Iron

I'm not a full-fledged designer, yet.

Iron

We use encoders to determine travel and direction of a conveyor belt.

Iron

32 position for a rotary switch, not on motor control

Iron

I have used a quadrature position encoder but I don't remember the resolution other than it was far more than I needed 

Iron

Yes, long time ago it is a optic electronic encoder dish.

Iron

VRS sensor with "teeth" every 10 degrees.

I have not used an encoder.

Iron

4 axis CNC millling machines

yes, 1000/rev quadrature

Iron

We're now on slide six.

Blogger

not used any position encoders outside of stepper valve actuators

Iron

I have, but I cannot recall the resolution.

Iron

have not used position encodeers

 

Iron

Paul's question:

 

Have you used position encoding in your applications? If so, what type of encoder and what resolution?

Blogger

You can prototype a quadrature encoder cheaply by ripping apart an old computer mouse or trackball.

Iron

What is the typical voltage supply used in encoder?

Iron

good morning, everyone

Iron

We're now on slide five.

Blogger

We're now on slide four.

Blogger

We're now on slide three.

Blogger

We're now on slide two.

Blogger

on time for the first time in a while

Hello from Monrovia.

 

Iron

hello from sunny albany ny

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, 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.

I need a 20A, 24V PWM H-Bridge in the $10 range.  (Fast/Good/Cheap)   :)

aloha from Kona HI

Iron

Hi from Andover, MN.

 

Iron

Good Morn from Florida

Iron

Good morning from SoCal

Iron

Hi, Lt.Dan, How's Gump?

Gold

We'll start in 10 minutes.

 

Blogger

Happy Friday Everyone!

Iron

Hello from Summerville, South Carolina

Iron

hello all from Edmonton, Alberta

Iron

Crikey! Another meeting coincident with our class.
I'll catch up as soon as possibe.
Have a good session everyone!

Iron

Good Morning from Valdez

Hello, the last day......

Iron

-The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts 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. If that doesn't work, the class will be archived immediately following our live taping.

Blogger

Good morning Ventura Ca

Iron

Greetings from Colorado Springs!

Iron

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

Blogger

Morning from Albuquerque

Iron

Morning from North Pole, AK near Fairbanks

Iron

Good Morning from Beaverton, Oregon.

Iron

Good morning from Chicago!

Iron

-Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

-Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using the hashtag #CEC.

Blogger

Good morning from Albuquerque, New Mexico.

Blogger

Maybe the motors will warm the day!

Iron

Hello from Sunny SE Lake Simcoe, Ontario Canada -- another cold summer day though.

Iron

Good morning from Baldwin Park California!

Iron

hello from Mishawaka

Iron

Hi from rainy Panama City, FL.

Iron

Hello from Sinaloa, Mexico

 

Hi from Chihuahua, Mexico

Iron

Good morning everyone from Vancouver.

Iron

Good morning from Mobile, AL

Morning from Portland Oregon

Iron

Hello from upstate NY.

Iron

Hi morning from Vancouver.

Iron

sruiz = The audio works best when using FF or Chrome as your browser. Also, make sure your flash player is updated with the current version.

I always have audio problems when trying to attend these courses.  Any idea how to fix that?

 

Iron


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