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Sorry I'm so late getting back to this.

Iron

It is known that FETs can be used as resistors... Is it efficient with motor control...?

Never used power resistors

No kinetic energy control design

Thanks. Paul, for an excellent program. And thanks everyone for attending. See you tomorrow.

Blogger

OK for today.  Come back tomorrow for

Making Them Do Cool Things.....

Regards, and good bye for now. Paul.

 

Blogger

lol in current terms

Iron

Chuckle chuckle from us sitting here.....

Blogger

"Think about it like this:

You would not slam your car into reverse while travelling

down the highway.  (Or would you??  Could be entertaining)"

 

I've known people who've done that. Dropped the transmission out of the car right there. Or dropped the drvieline.

Iron

Someone asked about 'just reversing the H-bridge to stop'

KABOOM.  Maybe, but it would be much better to stop, then

reverse than to try direct reverse.  Think about it like this:

You would not slam your car into reverse while travelling

down the highway.  (Or would you??  Could be entertaining)

 

Blogger

Someone asked about using a Zener diode to absorb

the kinetic energy.  In general, this will not work, as a

we would need a REALLY LARGE ZENER!!  A *cheap* alternative

is to use an MOV.  We have done so before.  The difficulty is

that MOV's are not typically intended for constant use, and will

fail if not seriously de-rated.

Blogger

Thanks Paul and Rob for a valuable presentation.

Iron

Thanks Paul, hear you tomorrow. TGIF

Automotive braking technology:  We've not done work

like that here yet, however, I doubt that simple brush

DC motors are used.  So like I said during the talk,

I believe induction motors are used and more sophisticated

regenerative techniques employed.  This is a topic for another

day.

Blogger

We get to Q1 either by turning it on, on purpose (no body diode)

or by going Q1 going off with Q2 off and Q4 on, energy will be

forced into the power supply. 

Blogger

What is the path by which power gets from the decelerating motor to Vcc, Q1 body diode and Q4 during the modulation of the braking? What if Q4 is turned off during modulation of the braking?

I had an application where an H-bridged motor required a dead stop without resistive limiting. It was destructive and entertaining. The armature would break away from the shaft about once a month...being a motor manufacturer made it rarther inconsequential. My question is breaking with PWM. Would that possibly cause some serious vibration system wide?

 

Iron

Would you please explaine the terms Fusing Energy and Current to Fuse?

Iron

VCC30V0 is intended to be our motor power rail, yes.

Blogger

Good session, very helpful. Thank You Paul. (original post dropped, again...)

Iron

Slide 9, no they are not turning on simultaneously,

that would be shoot through, they are pulsing in a

complementary manner.  Good point.

Blogger

I used a network of high energy wire wound resistors in an ad-hoc test to reduce brushed DC motor voltage (speed) where teh supply V was a fixed DC voltage.

Thank you Paul.   Very interesting talk.  Where do you hook the VCC_30V0 on slide 12 to?  The power rail? 

Iron

Wire wound resistors do have an inductive

component, and one should take that into

account.  YES, yes, yes.

Blogger

Can you speak to automotive electrical breaking technology? 

Iron

?? On slide 9, are Q1 and Q2 turning on simultaneously or are they opposite in status?

Gold

Thank Paul and Rob. I learn more from this letcure. I never used brak resistor before. I will try. Thanks a lot.

Iron

Very Interresting..Thank you very much

 

I have used the "bottom" of the H-bridge to stop/brake. The cautions about the supply rail increase should be headed. Also, using hte body diodes to handle the reverse current into the rail is dangerous. (Speaking from experience!)

Iron

What about using a zener diode to absorb the elevated voltage peak? Seems like that would work for small energy situations, though not for high power applications.

 

Thank you once again, Paul.

Iron

Thanks Paul and everyone!

Thank you Rob and Paul

Iron

Very useful. Didn't know that breaking topology.

Iron

Very useful. Didn't know that breaking topology.

Iron

thanks Rob and Paul, see all tomorrow.

Iron

Very good lecture. Thank you.

Gold

Alot of good information! Thanks Paul!

Iron

dropped post, have used similar circutis, first engineering project was to design a load/unload circuit to load disc on an optical disc system (bigger than a desk) back in the days.

 

Iron

Thank you Paul, another execellent lecture.

Iron

Paul, thank you for today's lecture

Iron

Yes I just use h-bridge to stop motor.

Iron

a super capacitor is used to store regenrated energy with dynamic braking, it has superior performance to storing in batteries

Iron

I would imagine super caps are a neccessity for regenerative braking

 

Has anyone just reversed the H bridge drive to stop the motor?

Iron

Slide 13 has a resistor that can take high heat, but the capacitors next to it are typically only rated 85°C.

Iron

We're now on slide 14.

Blogger

Does a wire wound resistor have significant inductance that would resist a current pulse?

dropped post... have used this type of crowbar circuit to protect systems from power supply regulator failure. It works well with a current limiter or fuse.

Iron

Have not implemented a circuit as in slide 11. (original post dropped)

Iron

Dsrajpal, try refreshing your browser. Or try firefox or Chrome.

Blogger

Have not done this, but I will look at this.

Iron

Hi every one sorry I'm late.

 

Iron

I haven't used this type of "clamps".

Iron

No active breaking implemented.

 

Iron

I have not implemented a back EMF circuit like this.

Iron

I had to implement a linear responce shunt, not a crowbar

 

We're now on slide 12.

Blogger

Never implemented circuit

Iron

 

Paul's question:

 

Has anyone listening implemented a circuit like that shown on slide 11?  Did it work?

 

Blogger

Sorry, Voice is breaking a lot, most uncomfortable. Everytime we need to click on play.

Iron

We're now on slide 11.

Blogger

My motor works on the optic lens it is low load.

Iron

Hello from Milwaukee!

Iron

We're now on slide 10.

Blogger

Never used power resistors. (original post dropped)

Iron

No braking resistors, only current  measuring resistors.

Iron

Never used power rsistor

Iron

no this power res till now.

Iron

We're now on page nine.

Blogger

Paul's question:

What power resistors have you selected for your application? Have you observed any unexpected failure modes?

Blogger

I was involved with designin Elevator controller

Iron

We're now on slide eight.

Blogger

Slide 5: So the motor acts as a generator in this case?

We're now on slide seven.

Blogger

No KE design constraints here but I can think of application where resistive braking is used - locamotives.

I've never had to manage kinetic energy in any design. (lost original post)

Iron

I had to deal with it with mechanical springs and dampers

Iron

We're now on slide six.

Blogger

We're now on slide five.

Blogger

I was involved in the design of a controller for an electric lawn mower. Safety requirements dictated the blade had to be stopped very quickly.

Iron

Aircraft landing gear

 

Hello from south central PA.

Paul's question:

 

Who listening has to manage significant kinetic energy in your designs?

Blogger

We're now on slide four.

Blogger

Greetings from Colorado Springs.

Iron

Good afternoon fom Mobile, AL

We're now on slide three.

Blogger

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.

Audio is live! Lets get to it!

Iron

Hi from Imagineering

Iron

good morning everyone

Iron

Hello from Seattle.  It's finally raining again but only for a day or so...

Iron

Hi from Andover, MN.

 

Iron

Good morning from California

Iron

Good Morning from Valdez

Greetings from Southeast Michigan.

We'll be starting in about 10 minutes.

Blogger

-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

why aren't my messages showing

Iron

Hello from SW Michigan

Iron

hello all from Edmonton, Alberta.

Iron

Hello from Huntsville, Al

Iron

How are you Rob? How's your day going?

Iron

Good morning from California!

Iron

Hello from Summerville, South Carolina

Iron

Hello from Gold River.

Iron

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

Blogger

Goodafter noon everybody

Platinum

Morning from North Pole, Alaska near Fairbanks

Iron

Greetings from the garden spot of the universe: Minneapolis Minnesota.

Hello from Beaverton, Oregon.

Iron

Good day from Valladolid, Spain

 

Iron

Good Morning from Colorado

Iron

Hi everyone goog morning.

Iron

Hi from Panama City, FL

Iron

Good morning from sunny Edmonton, AB

Iron

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

Blogger

Good morning from NY.

Great series with good information.

Iron

-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

Morning from Portland Oregon

Iron

I believe it is going to be a good one today.

Iron

if time permits, i will attend

Platinum

Now, they're here. Web browser tempermental ? Computers, can't live with them, can't live without them, much.



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