|
Post by Trip Rodriguez on Sept 1, 2014 19:52:43 GMT
This post is mostly to ask how to choose between AC, DC, and servo type motors. What are the benefits of each and what is the typical difference in cost?
I've tried lots of searching around online but it is very difficult to figure out what good options I have for motors. This is especially true being in the US with shipping costs so high.
I'd like to spend $1,000 US dollars (or less) for three motors with controllers and power supplies etc., whatever is needed to run them. I'm hoping to upgrade to 4DOF but that isn't critical currently. Maybe some day 6DOF =) The electronics suggested here look pretty inexpensive which is good! What motor options do I have that will keep me in that price range (including US shipping) and what do I need to power them? I tried searching on ebay and google for servomotors but I don't know what I'm looking for. I need either some specific options or enough info for me to go shopping and try to find something that works.
Thanks for any help, and thanks for creating this forum!
Trip
|
|
|
Post by vicpopo on Sept 1, 2014 20:25:58 GMT
Hi ,
For me from the less to the most expensive is DC , AC , Servo.And Servo is about twice or three times more expensive as Servo. For the simplicity to use and to setup,I would say AC , Servo , DC or AC , Servo , DC.
For DC Motors it's not easy to find a suitable H-bridge or other controller ( Kangaroo ) and you have to find the right PSU ( big current for powerfull DC Motor).
In my opinion AC Motors with gear box are the best compromise to build a good simulator.
|
|
|
Post by Trip Rodriguez on Sept 1, 2014 21:00:26 GMT
Thanks Vic! Also, Thanos had linked me this video www.youtube.com/watch?v=9CMIPu3t7d0 and I think I tracked down what this servomotor he showed is: www.teknic.com/Those look great and depending on the model maybe affordable. Thanos what is the least expensive model of theirs that would be suitable for our use? My motion platform will weigh about 45kg and I weigh about 76kg. My rig is for both flying and racing, with space flight taking highest priority followed by racing. It's going to be 3DOF but I'd like to add yaw for racing. Vicpopo it really sounds like you think AC motors are the way to go, can you give me enough info so I can go shopping online for motors? What do I need to power them? Thanks!
|
|
|
Post by vicpopo on Sept 1, 2014 22:23:30 GMT
For my 6 dof I choosen AC motors with gearbox. Motors 0,27 kW with gear box with gear ratio about 100. that means 12 tr/min output shaft . The torque is 190 Nm for 1400 rpm motor. To be sure because I'm facing sometimes some motor overload i think a motor with 0,37 kW, or 0,55kW for a 3dof should be enough. You can keep the same gear ratio. Inverter with Vector Flow Control driving mode , Torque driving mode are the best choice.It can hold the load at 0 rpm and this inverter is suitable for dynamic application. Tronicgr advices worm gear gear box.Personaly I've got helical gear unit and I'm happy with.This unit has got a better efficiency and more torque for the same power as worm gear.
|
|
|
Post by Trip Rodriguez on Sept 2, 2014 4:35:29 GMT
Thanks again Vic.
It looks like I need something with about 500W and an output RPM (after gearbox) in the teens. I don't know what to look for as far as inverters either. 220V input is inconvenient for me as well, but manageable.
The AC motors option sounds great but it's the one I find the least information on and find the most confusing. I have no idea where to start, how to shop for AC motors or what other parts I need to make them work. I'm gravitating to the Teknic servo motors because that seems easier but I shouldn't spend that much especially if I can get the same performance for much less money.
Thanks!
|
|
|
Post by vicpopo on Sept 2, 2014 4:52:17 GMT
Hi ,
For sure servo motors are the best choice but not the cheapest price.And you need gearbox also.to increase the torque.Inverter is also a cost and often most expensive regarding those used for driving AC motors . Normally AC motors (asynchronus motor) is the most simple motor to produce .You should find locally manufacturers !
|
|
|
Post by Trip Rodriguez on Sept 2, 2014 4:55:16 GMT
Oh thanks, I was editing my post to clarify but you saw it before hand!
How do I learn what kind of motors and inverters to buy? What other parts will I need and where is a guide on how to get it wired and working? I can look for a local supplier but I was thinking ebay, I just don't know what search terms to use =(
|
|
|
Post by riton39 on Sept 4, 2014 6:08:00 GMT
0.55kw for a 3 DOF may be insufficient if the speed is different. my engines are just 0.55kw 31 tr.
I'll have to spend a larger 1.1 kw can be to be on, with the inertia
|
|
tino
Junior Member
Posts: 71
|
Post by tino on Sept 8, 2014 0:28:43 GMT
For my 6 dof I choosen AC motors with gearbox. Motors 0,27 kW with gear box with gear ratio about 100. that means 12 tr/min output shaft . The torque is 190 Nm for 1400 rpm motor. To be sure because I'm facing sometimes some motor overload i think a motor with 0,37 kW, or 0,55kW for a 3dof should be enough. You can keep the same gear ratio. Inverter with Vector Flow Control driving mode , Torque driving mode are the best choice.It can hold the load at 0 rpm and this inverter is suitable for dynamic application. Tronicgr advices worm gear gear box.Personaly I've got helical gear unit and I'm happy with.This unit has got a better efficiency and more torque for the same power as worm gear. Hi vicpopo, 12 RPM seems a bit slow for a racing motion sim? What is 12RPM on your simulator approximately in mm/s?
|
|
tino
Junior Member
Posts: 71
|
Post by tino on Sept 8, 2014 0:58:19 GMT
Hi , For me from the less to the most expensive is DC , AC , Servo.And Servo is about twice or three times more expensive as Servo. For the simplicity to use and to setup,I would say AC , Servo , DC or AC , Servo , DC. For DC Motors it's not easy to find a suitable H-bridge or other controller ( Kangaroo ) and you have to find the right PSU ( big current for powerfull DC Motor). In my opinion AC Motors with gear box are the best compromise to build a good simulator. Hi Vicpopo, I don't want to use AC motors. I think 12V DC motors are safer and suit my budget better. Speaking of DC controllers, do you know if these work OK with Thanos board? www.technobotsonline.com/kangaroo-x2-motion-controller-for-sabertooth-syren.htmlwww.superdroidrobots.com/shop/item.aspx?itemid=822How about these? www.pololu.com/product/1455or www.pololu.com/product/1499/ (2x60A!) Big current PSU should also be easy to find as used server PSU are quite cheap (164A @12v for $25 Litecoin folks have been using them for a while (loads tutorials on the net) www.ebay.com/itm/Delta-IBM-DPS-2000BB-74P4453-2000W-BladeCenter-Hot-Plug-Server-Power-Supply-/390925563027?pt=LH_DefaultDomain_0&hash=item5b04fab493
|
|
|
Post by vicpopo on Sept 8, 2014 16:40:20 GMT
Hi , 12rpm with 80 mm arm that means 100 mm/s. No for me it's fast enough with big torque. I don't know if controllers work for DC motors.Didn't want no more to use dc motors except for testing a G-Seat. You can ask for dc motors in the thread conecerning a motion sim with these motors
|
|
tino
Junior Member
Posts: 71
|
Post by tino on Sept 8, 2014 16:57:47 GMT
|
|
|
Post by vicpopo on Sept 8, 2014 17:17:46 GMT
In my opinion if you want this speed (300 , 400 mm/s )keep scn5 for a 3 dof .With a 6 dof at this speed it won't be a motion simulator but a big and dangerous shaker !
|
|
tino
Junior Member
Posts: 71
|
Post by tino on Sept 8, 2014 21:27:24 GMT
Hm, personally I'd like my simulator to be as realistic as possible, so I'm OK with shaking in a rally car. If the simulator is shaking a lot in F1 game, then something is not configured properly. This simulator is very expensive very fast and very powerful. I know this is exaggerated example, but one we should be aiming for. www.youtube.com/watch?v=IVlLX7qMPBQ#t=151You can get a feeling from the video that it works extremely smooth, no shaking, just bump when you hit something. I'd like to have the option to slow down the motors if I really have to, that's why I like faster simulators. P.S. And here is the real thing www.youtube.com/watch?v=EGUZJVY-sHo#t=161
|
|
|
Post by riton39 on Sept 9, 2014 6:13:48 GMT
480 mm / s, that's what I'll get. I chose motors 30 tr. I think we should increase the range of effects values to get a good setting, a range of detailed effects and powerful shocks. error is to saturate the effect which makes the simulator too violent
|
|