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Post by billo2404 on Nov 14, 2016 0:43:34 GMT
Hi guys. . . I have received a request for a bit 'special: The realization of a 6DOF type my but able to work with at least 1000 kg load, which is a lighter machine of the superfluous 2 more people. The car should weigh about 800 kg and I considered 100kg per person Does anyone know help me calculate the power for each engine to use? I would not want to spend money to a friend for a project that is likely to not work so before starting this new adventure I have to be sure that the power is sufficient. You know you help me?
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Post by tronicgr on Nov 14, 2016 13:53:05 GMT
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Post by billo2404 on Nov 15, 2016 2:11:51 GMT
thanos thanks, very good sprint but he uses 1.5 HP motors and gearboxes 1:180 seen that this is a flight simulator. I in my old project I used 1:60 gears but I have to say I do not ever use the maximum speed, arriving at most to 60% on AMC. I groped with engines of 3.0 HP (2.2 kW), but in your opinion what is the maximum reduction applicable to a driving simulator in order to make the max the engine torque? 1:100 would be fine?
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Post by tronicgr on Nov 17, 2016 18:40:19 GMT
thanos thanks, very good sprint but he uses 1.5 HP motors and gearboxes 1:180 seen that this is a flight simulator. I in my old project I used 1:60 gears but I have to say I do not ever use the maximum speed, arriving at most to 60% on AMC. I groped with engines of 3.0 HP (2.2 kW), but in your opinion what is the maximum reduction applicable to a driving simulator in order to make the max the engine torque? 1:100 would be fine? Yes you can split the difference for more speed if you use bigger ac motors! 100:1 gearbox sounds perfect. Just make sure it can handle the torque and have as small backlash is possible. Backlash can break the gears with such loads and speeds. Thanks Thanos
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Post by billo2404 on Nov 18, 2016 0:29:22 GMT
Thanks thanos. . . Meanwhile update: reducing as much as possible the weight of 'car we got to 500 kg and considering 2 people on board and arrive add 250 kg to 750 kg max. At this point, trying to keep as low as possible the sim consumption'm thinking of using 1.5 kw (2 HP) 1400 rpm motors with gearbox 1: 100. According to 'engineer engine company but would benefit from using 2800 rpm engine and gearbox 1: 200 or higher torque for the same power. Having never seen anyone use engines from 2800 rpm I wonder if there's a reason why nobody uses them or is it simply a case. One more question: Since you calculate exactly the required torque for a given weight to handle involves calculations that my skills do not allow me I wanted to know if there is a link that with time has been verified between engine torque and weight to handle for example: for 200 kg are enough motors from 0.30 kW (it seems vicpopo uses these powers). . . . for 300 kg motors XXX Kw etcetera. . .
Grazie thanos... intanto aggiorno: riducendo il più possibile il peso dell' auto siamo arrivati a 500 kg e considerando 2 persone a bordo aggiungiamo 250 kg ed arriviamo a 750 Kg max. A questo punto cercando di tenere il più basso possibile il consumo del sim sto pensando di utilizzare motori da 1,5 kw da 1400 rpm con riduttore 1:100. Secondo l' ingegnere della ditta dei motori pero avrei un vantaggio utilizzando motori da 2800 giri e riduttore 1:200, ovvero maggior coppia a parità di potenza. Non avendo mai visto utilizzare nessuno motori da 2800 rpm mi chiedo se c'è un motivo per cui nessuno li utilizza o è semplicemente un caso. Un altra domanda: Visto che calcolare con esattezza la coppia necessaria per un dterminato peso da gestire comporta dei calcoli che le mie compoetenze non mi permettono volevo sapere se è esiste un legame che con il tempo è stato verificato tra coppia dei motori e peso da gestire: ad esempio: per 200 kg sono sufficenti motori da 0,30 kW (mi sembra vicpopo usi queste potenze)....per 300 kg motori da XXX Kw eccetera...
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Post by vicpopo on Nov 18, 2016 5:32:20 GMT
To lift about 150/170 kg I use 6x0,25 kW AC motors standard 4 poles means 1400 rpm and ratio 105:1. My torque is about 193Nm at 1400 rpm each and my crank arm is 110 mm length( tangential speed near 142 mm/s) and the circle around the gravity center measures around 550/600 mm ( where the arms level are attached) if you want more tangential speed ( 300 mm/s ) putting longer cranck arm you have to oversize the motors a little bit.You can increase the motor speed above 1400 rpm but keep the gear ratio at 100:1 it's a good thing . Don't forget that gearboxes convert speed to torque ;-) !
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Post by tronicgr on Nov 18, 2016 14:07:57 GMT
Perhaps someone could make a spreadsheet for the calculations. They are not so complicate. Then just enter the motor specs and gearbox specs and have quickly the results for each combination.
I'll try to make one as soon is possible.
Thanks Thanos
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Post by billo2404 on Nov 18, 2016 16:19:35 GMT
To lift about 150/170 kg I use 6x0,25 kW AC motors standard 4 poles means 1400 rpm and ratio 105:1. My torque is about 193Nm at 1400 rpm each and my crank arm is 110 mm length( tangential speed near 142 mm/s) and the circle around the gravity center measures around 550/600 mm ( where the arms level are attached) if you want more tangential speed ( 300 mm/s ) putting longer cranck arm you have to oversize the motors a little bit.You can increase the motor speed above 1400 rpm but keep the gear ratio at 100:1 it's a good thing . Don't forget that gearboxes convert speed to torque ;-) ! Great this confirms to me that with engines from 1400 rpm and gear from about 100: 1 the sim speed is fine even with levers rather short. For the levers levers could make myself not too long since the 'end use does not require exaggerated angles but a nice system for beginners or those who have never tried the simulation. The thing that I could not influence the system is the circle around the center of gravity measurements. Being a system to predict a car circumferences larger than normal. How can this affect belonging decreasing the 'maximum inclination, positively or negatively to the power required? Ottimo questo mi conferma che con motori da 1400 giri e riduttore da circa 100:1 la velocità del sim va benissimo anche con leve piuttosto corte. Per le leve potrei fare anch'io leve non troppo lunghe visto che l' utilizzo finale non richiede angolazioni esagerate ma un sistema gradevole anche per i principianti o chi non ha mai provato la simulazione. La cosa che non sapevo influire sul sistema è il cerchio attorno alle misure centro di gravità. Essendo un sistema per un auto prevedo delle circonferenze più grandi del normale. Come può influire questo apparte il diminuire l' inclinazione massima, positivamente o negativamente per la potenza necessaria?
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Post by billo2404 on Nov 18, 2016 16:21:11 GMT
Perhaps someone could make a spreadsheet for the calculations. They are not so complicate. Then just enter the motor specs and gearbox specs and have quickly the results for each combination. I'll try to make one as soon is possible. Thanks Thanos fantastic idea. . . It would be a very useful system for all those who come to the realization of a 6DOF fantastica idea...sarebbe un sistema utilissimo per tutti coloro che si avvicinano alla realizzazione di un 6dof
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