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Current flow was measured with a digital clamp meter (AC amp meter) at around 5A of course it doesn't show the LRA nor a graph of dI/dT....good luck finding resistors rated for 5A@400VAC. :o

The...

I used 600V triacs because it was the only option available, but after the fail the local supplier had a new stock of 800V devices so, I now have 800V triacs but a little investigation about the...

Thanks for the reply Al, I'm happy you showed up :)

I've gone through too many application notes but missed that one, and I have to say that I'm lost :drowning: at least the one you pointed shows...

It's not even a controller, so, no phase control. it's supposed to be a very basic soft starter to cut down on LRA current spikes...

Hi,

if you think about it, the PWM signal doesn't need to be 3 phase related, it's just like a stupid dimmer/chopper turning on&off to linearly increase the current & try to suppress the 80A...

Hi KOC62, sorry for the very late reply.

I'm not sure it's the snubber, but it might be the cause, because a bad snubber can create very high dI/dT current rise rates that will fry the triacs...

Up !

Hi all,

I have built a 400Vac 3ph solid-state relay using BTA41-600 triacs as shown in the attached schematic, to drive a 6.6KW motor which has a LRA of 80Amp, but draws around 5Amps while...

Hi Mihai, congrats for your awsome project !

As for the scope, I have no idea about the features you require but, did you take a look at this DIY - USB OSCILLOSCOPE IN A MATCHBOX

Anyone ported...

Sorry for the late reply guys, and thanks for replying !

Al,
I already checked everything on my settings page, I even disabled and re-enabled receiving PMs...but same result, must have been...

Thanks for the reply Al and sorry for the inconvenience.

Aha, so, I guess it is a permissions problem, who should I contact to lift the ban on receiving PM's ?

Well, about my question, I just...

Motor length is ~130mm without encoder and ~148mm from mounting plate to the rear of the shaft behind the encoder. The model number is scratched as you can see on the previous pics but it looks like...

Hi Al,

Here are the pics, the motor is ~57mm in diameter. Do you have an idea about what are the red and green dots meant to be used for ? (for a stroboscope maybe ? but why ? the red and green...

Hi ShadowCoil & welcome to the Zone !

Thanks for posting those specs, please go ahead and post what everything you've got, it might come in handy to someone someday ;)
Do you have max current...

Mike, I apologize if I sounded like you were fishing after me, I was just trying to be polite :) it isn't like if you were one of those marketing sharks... You've helped me before and I always...

230V AC RMS ? I thought it was 98V/krpm * 3 = 294V @ 3000RPM ... after looking around the net, Vrms is 294/sqrt(2)=207.9V ....Nice I thought I'd be messing with the three phase and stuff and you put...

Hi Mike, thanks for the reply !

Are you serious ? even if my motor has three wires going to the windings and a fourth going to the housing as GND ? I guess you mean a three phase VFD, right ?
...

From Granite manual "Hall or commutation sensors are not required but are supported for AC/BLDC motors" ...is that what you meant ?

Note: 200 VAC AC servo motors would reach about 40-60% of their...

No encoder type is mentioned on the motor's nameplate, the motor code says it had an "4096 ppr (pulses per revolution)- 6 pole; Incremental Encoder" , it came without encoder, but the manual talks...

Al,

The motor's manual says you're right about commutation tracks...etc. Here's what it says on page 50:




OK, now, Any cheap encoders with commutation tracks ? I guess they are required...

Thanks for the reply Al,

I already looked at Granite drives but from what I understood it will not use the motor to its full potential.

Larken ? you mean viper servo drives ? isn't that an HP...

Hi Al, thanks for the reply, I've sent you a PM last week but no reply ?

commutation tracks ? commutation angle ? AC sinusoidal ? Can you please, advise a good read to introduce me to these motors...

Hi guys !

I've found a brushless AC servomotor at the scrap yard, I don't know if it's any good, it came without the encoder and I have no way to test it.

Please, advise about testing...

Hi dinko !

Your problem requires linear encoders (glass scales...etc.) which are VERY expensive ! in your situation you'd need two linear encoders on X axis =>VERY VERY expensive :)

A cheap...

Got a quote from a shop who is supposed to have all the required tools, collet chucks cnc's ...etc.

He was simply trying to avoid the job and then, said it'd be expensive to bore 10mm it's...

I don't know and I don't think so (rubber belts), but having accurately machined pulleys will at least allow me to rule them out while troubleshooting issues, and the belts are intended to be...

That would be the case with NASA, in my case the belts are already here...I told you I am way ahead of them ;) :D

Thanks !
cnc2.

Hi guys !

After we found out that machining soft jaws for the CNC lathe(school machine shop) would be too expensive for such a small job, the operator directed me to a well equipped machine shop,...

That's what makes CNCzone such a great place, thanks for sharing !




I get the picture, my main problem is in finding a honest/reliable machinist, the one with the hydraulic lathe and collet...

Is that a Troll on your avatar ? ;)