3DOF power simulator

[thecure]

The SDA and SDL works ? .tks

[tronicgr]

I don't have any I2C devices at the moment that I need to interface through the I2C port, so for now you don't need to connect anything on that port.

I reserved that port for some I2C 9DOF sensors that exist (accelerometers or gyroscopes) but I don't have any in my hands to experiment and add the code for them. If done well they can replace entirely potentiometers for motor position feedback.

Thanos

[thecure]

take this card http://www.pololu.com/catalog/product/759 ...........My question is : "where I marked in yellow is it a real electric brake?



another question about thanos circuit ...........by modifying the firmware, is it possible to have a 5 volt on P1D2 and P2D2 when pwm starts to rise ?..tks

[speedy]

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 (118.91 KiB) Viewed 4575 times

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

VFD 2.jpg (115.61 KiB) Viewed 4575 times

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

[thecure]

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

[tronicgr]

take this card http://www.pololu.com/catalog/product/759 ...........My question is : "where I marked in yellow is it a real electric brake?



another question about thanos circuit ...........by modifying the firmware, is it possible to have a 5 volt on P1D2 and P2D2 when pwm starts to rise ?..tks

Yes, when the PWM signal is L (logical 0) outputs are shorted together to the ground to short the motor's leads and have it brake.

Why would you need both P1D2 and P2D2 on 5v? like enable thing? These are extra direction pins for other h-bridges that need 2 direction controls. For the Pololu motor driver (on the link you gave above) you need only one direction control.

Thanos

[thecure]

another question .....if we use this DC motor for example http://www.zappautomation.co.uk/sy85sth ... h=9_159_44 and the driver http://www.zappautomation.co.uk/uim2400 ... =9_3_4..... because with them we would not need the brake....right? tks

[tronicgr]

I don't think you want to use stepper motors... They are too weak for use in motion simulator and they cannot rotate too fast and they are not dynamic at all. They are used in applications that constant speed is needed and precision in positioning (like positioning tables for mills or 3D printers etc...)

Before I introduced DC motors solution (years ago), when x-sim version was still 1.6, there was a try to make such stepper motor systems unsuccessfully... The only stepper actuator I know, that was ever used successfully in motion simulators, is the SCN5/6 (they still have limitations like 10kgf max or 20kgf max etc)

DC motors or AC motors are the best solution for now that provides full dynamic motion from soft curves to vibrations level.

Thanos

[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

[speedy]

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