Affordable or DIY 3-phase AC Induction?

[danielDK]

The setup i have right now is using 3x 0,75 kw 6 pole high torque (no gear) induction motors with 3x ge vat200 vector drives. The system can lift a small truck but the reaction time (fast transitions) is not great.. so i'm converting to dc motors with pwm control...

Ac motors are propably fine for a flight simulator though...

/Daniel

[vicpopo]

Ac motors are propably fine for a flight simulator though...

/Daniel

Hi,

Not only for flight simulators look at this link : http://www.x-sim.de/forum/viewtopic.php?f=37&t=293&start=40#p6234
You would be surprised with the dynamics and the fast response...

[Riton]

+1 !!

[danielDK]

Hi Guys,

That looks pretty much like what i'm seeing with my setup - fastest transition/oscillation is around 1hz. The force is there - but reaction time is too slow for my liking.
I know it is a case of preference, but i would like to feel the rumble strips in the corners and have a nice crisp definition of the road surface. My vector drives have a minimum of 0.1 of ramping up/down during accleration and braking with dc injection. That gives me a 5hz maximum if we ignore physics and and assume the motors will accelerate instantly..
I also dislike gear motors which often have quite a bit of slack, wormdrive motors i have found to be quiet and precise though.

Ps: Are your vfd's different in that regard, i would ofcourse like it best if i didn't have to throw away three brand new motors and vfd's...

/Daniel

[vicpopo]

Hi Daniel,

It's difficult to share the feeling of our simulators (like the one from Riton).But believe me you are wrong when saying that the time response is too slow.
First you can't evaluate it when showing ... It's too fast for watching something.The rumble strips and the rocks on the road for Riton with dirt3 are not a dream but a reality.
The point we didn't yet discuss , we have both an amc developped by Tronicgr.For Riton is an amc644usb ( transfert rate 115kbauds ) and for me an amc1.6 ( refresh rate 7 khz , transfert rate 125 kbauds).
My inverters are from sew eurodrive movitracB and I use the vector flow control with ramp up and down to 0.
Riton has Hitachi with the U/f law and his ramp up and down are setup to 0 also like me.

And for gearbox you are not also in the right because I have helical gear and no problem , stable , high torque , no slack.

We don't need synchronous motors which are the logical choice for simulators but much more expensive than AC motors and wihout 3 phases at home impossible to connect.

Greetings

Edit: we have inverters with input monopahse home net (220volts) and which supplies ac motors with three phases.I would like to,say that it's difficult to find an inverter with the same feature as I decribe and which can drive synchronous motors.

[danielDK]

Hi Vicpopo

yes it is difficult to gauge the performance of the simulators from a youtube video..

good to hear the sew eurodrive gearboxes are of good quality!

Looking through the manual for the movitracB (page 65) - i see the minimum ramp-up/down is 0.1 for - not zero?

i'm using "GE vat 200" VFDs - also vector based and with single phase input and dc braking.. i'll see if i can capture a video of the maximum oscillation frequency... so you can see what my concerns are..

/daniel

[vicpopo]

Hi ,

I setup the ramp up and down to 0 and it works without VFD errors.
The max speed motor is setup to 400 rounds/min that means with the gear ratio 12 rpm on output gearbox shaft.
I increased the time for overload current from 1 second to 4 seconds.
Could you teill me how did you drive your inverter , with which board?
Best Regards.

[Riton]

it is easy to evaluate the performance with minimal experience, I do some video on the details of operation, vibrations ....
Look in HD