3DOF power simulator

[basthard]

allow me to ask ... if you are going to use the 2HP 3phase AC motor or the M1020 500W 24V motor ? ...



from my side of view ... The 3phase AC motor + inverter is the best choice ever ... check these pages on ABB article .
and why 2HP ? ...a 1/2HP with it's inverter is very good ... you're using a scroll ball axes and it is doing all the lifting you need ... specially when using a small pulley on the motor axes and a larger one on the scroll ball axes ... it will double the torque maybe treble it ... and control the speed by the frequency ...

VFD 1.jpg

sorry I couldn't upload the pdf file as it is a 8MB in size

VFD 2.jpg

And ... If you are going to choose the 500W 24V motor (Direct-on-line) as above ... then you have to choose far stronger motor controller than this pololu card ... and a strong DC power supply 1.5 times this 500W motor to work at leas 10 minutes without heating up .

regards
speedy

thanks for the advice but:
Here in Italy the three-phase current not to give in a private house not worth it.
then we prefer to move the entire system with batteries, then the amperage does not scare us he eh eh eh eh
in our transmission system should have aof force required for the rotation of about 0.9 - 1.1Nm at pulley,
that for an engine 24v is about 360W, 500W us we would have one .... oversized ...
I think enough.
for cotroller we verificto and Pololu we had indicated it was wrong ...
was just an example for the pin.
we have seen that Pololu High-Power Motor Driver 24v23 CS heatsinks supports up to 37 amps continuous, which we will never (I think)
the engine in question (500W 24V) requires 25.7A max i found in a datasheet somewhere...

still continue with the support that we need it thank you, thank you very much
basthard

[basthard]

we will use dc motors 24v 500w 30 amp ... would you tell me where to find a card which has a brake as the Pololu card? tks

you will come back to this post again and again ...
Me ... using the advantage of the "warm gear " super high torque in low RPM ... PLUS ... the high output speed that could be taken instantly from a 3phase Ac motor (.05sec from zero to the max.)... PLUS ... simple programming profiles and technology advances in inverters now are amazing (operating from single line to give a 3phse )... PLUS ... power efficiency and a continuous single line AC power source with out investing more money into any more power supply 12 or 24 V or Acid batteries ... PLUS ... the running coast of the simulator and the electricity bill every month ... PLUS ... a 50Kg is a normal load for these motors ... If you count these a 1/2HP - AC - 3PH will be your favorite connected to your scroll ball axes ...

careful it will blow you up in the sky in a second ... that's why they call it Industrial AC motor or thecure .


pay a visit to one of the AC motor stores and ask the guys to start a small 1/4HP - 3ph motor with inverter in low speed in front of your eyes ... and see for your self

regards
speedy

hello, but then you do not understand:
from us electronically cnc coast maybe a little too much for a product
unprofessional ... not worth it, just to give you an example:
a driver for 3-phase asynchronous motors costs as a whole kit
of contoller and DC motors ...
so do not know how much it's worth.
basthard

[tronicgr]

then we get it.
but now I want to know if it is possible to have an output
of 5v as requested thecure. we would like to check this out
an additional external brake (maybe optional) to be evaluated at the time of construction. we have no idea if it will or not.
so if it is possibie you we would be grateful.
basthard

Hi,

I'll keep in mind to add your request for an emergency stop input then (probably on one of the ADC channel inputs), that sets PWM channels to 0v (logical low) and Direction outputs to 0v (logical low) that is the default setting for brake for almost all motor drivers.

Along with that I want to add soft-start of the motors until they reach initial target during power up. That would be tricky as I need to keep track of the speed of the motor based on the potentiometer feedback measurements.

Maybe tomorrow or Friday I'll have a new firmware about all this, given I get some free time for the modification...

Thanos

[thecure]

tks !!!

[motiondave]

http://onexia.com/Parker_ADD_ETH_Cylinder.html
These actuators may be the go, very fast moving, but I guess expensive.

[thecure]

out of curiosity I sent an email on prices

[basthard]

then we get it.
but now I want to know if it is possible to have an output
of 5v as requested thecure. we would like to check this out
an additional external brake (maybe optional) to be evaluated at the time of construction. we have no idea if it will or not.
so if it is possibie you we would be grateful.
basthard

Hi,

I'll keep in mind to add your request for an emergency stop input then (probably on one of the ADC channel inputs), that sets PWM channels to 0v (logical low) and Direction outputs to 0v (logical low) that is the default setting for brake for almost all motor drivers.

Along with that I want to add soft-start of the motors until they reach initial target during power up. That would be tricky as I need to keep track of the speed of the motor based on the potentiometer feedback measurements.

Maybe tomorrow or Friday I'll have a new firmware about all this, given I get some free time for the modification...

Thanos

Hi Tanos,

perhaps I have badly explained:
the input that will be suitable for any E-Stop is fabulous view of the magnitude of the forces in play, but I meant, if possible, one other thing:
from the 2 pin P1D2 and P2D2 have 5V when you have any corresponding PWM output, and when it stops, the signal goes low, 0V ...
So that we could control an external circuit with a control relay to an electro-mechanical brake.
Thanks for your patience ..
Basthard

[tronicgr]

Hi,

I don't want to alter the function of P1D2 and P2D2 as its used by other h-bridges that need two direction controls.

What you can do is to use an OR function chip like the 74HC32 to achieve what you want to do with the external relay cutoff. This way the brakes will engage when both direction controls are logic low (0).

See this article for more details:
http://www.hardwaresecrets.com/article/Introduction-to-Logic-Gates/237/5


Apart from that, I compiled a new firmware that turns OFF all PWM and directions when the "A1" pin (from the encoders header) is grounded. You can use this with multiple limit switches around your cockpit or just a big red emergency switch to stop everything. The AMC keeps receiving data so when you are ready you just flip that switch back on, to continue the motion. The firmware (1.1g) will be posted promptly in the AMC1.6 project thread.

Thanos

[thecure]

thank you very much...............

[thecure]

I saw that turning the potentiometer 10k multiturn (10 laps), I have the values ​​from 0mV to 5v in a single lap.the other laps are useless.but... Is it the right value 10k?