| Author |
Message |
Mike9876
Unregistered guest
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| Posted on Thursday, July 2, 2009 - 3:14 pm: |
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I'm planning on building a self-balancing 2 wheel robot. I've built some robots before and so have a few contraints as I salvage stuff from previous builds.
I need advice on a motor/gearing and what products you sell that'll do the job.
As I said, two wheels about 10"/250mm dia. Top speed about 5/6 MPH. Total weight currently 12Kg + whatever you suggest as motors/gearing. Must be 12V. Width between wheels approx 10"/250mm. C of G will be above the axle, I've not decided how high yet, I think I'm going to have to experiment with that aspect.
My concerns are with switching the motors forward/reverse and the current that's going to be consumed as the thing just tries to balance, as well at the clattering any gearbox/drive system gets as the robot trembles.
What motor/gearing/drive system do you recommend ? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1075
Registered: 10-2004
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| Posted on Friday, July 3, 2009 - 8:36 am: |
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We do not have any experience of building a self balancing motor so I shall do the best I can in advising.
The rpm of the final drive will need to be about 200 rpm. 12kg sounds quite low considering you are using 250mm wheels but on the basis of 12kg, we do not have any geared motors that meet your requirements. This means using a motor and building your own gearbox. You could consider using windscreen wiper motors although they are quite heavy and use a worm drive.
The motor controller will need to be a full solid state 'H' bridge type with quick acceleration / deceleration ramps, our Dimension Engineering range would suit. The controller would need sizing based on the stall current as that is what it is likely to see as the bot balances.
200 rpm is a large reduction do gear backlash will generate noise although a worm drive should be the quietest as it's only a single stage reduction.
Not sure if this has been of any help but feel free to ask further questions if necessary. |
Zeljko Kezic (Zak)
Member
Username: Zak
Post Number: 1
Registered: 7-2009
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| Posted on Saturday, July 25, 2009 - 6:13 am: |
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Hi
looking for small DC motor 12V, 0.6A, 14W out, speed 3700rpm (esential).
This information is from motor's label.
Please help.
Regards,
Zak |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1093
Registered: 10-2004
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| Posted on Sunday, July 26, 2009 - 12:39 pm: |
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Zak,
There is something wrong with your figures, you have 7.2W in and 14W out which is clearly wrong. Please double check your figures. All the motors w supply are listed on our website along with the data so it is worth a look through those. However, your rpm is very low for a small model motor without gearing. |
Dave Linsell
Unregistered guest
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| Posted on Friday, October 23, 2009 - 10:14 am: |
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Please can you provide details as follows: I need to drive a 2cm diameter shaft at approx 4-5 rpm from a 12volt dc motor. I can measure the torque required, but need advice on the selection of gearing and motor drive from you please. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1141
Registered: 10-2004
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| Posted on Wednesday, November 4, 2009 - 8:49 am: |
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Without knowing what torque you require, we cannot recommend a geared motor. Driving a shaft at 4-5 rpm is easy enough but the motor size depends on how much work you need it to do. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1142
Registered: 10-2004
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| Posted on Wednesday, November 4, 2009 - 8:50 am: |
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Paul - thanks for the reply. I measured the torque required - its around 10 lb-ft (=14Newton Metres?) |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1143
Registered: 10-2004
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| Posted on Wednesday, November 4, 2009 - 8:50 am: |
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Hi Dave,
That is a very high torque, we have a motor 1450-056 that gives 45Nm at 12V at 5rpm so in theory it should do the job. Being a model motor, you will need to ensure there are no shock loads on your load. |
andrewclouston
Unregistered guest
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| Posted on Tuesday, November 3, 2009 - 2:40 pm: |
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I am looking for a small motor to power a rotating lantern fixture which we are making. The lantern is to be a caketin shape, 350mm dia. I belive I need a DC geared motor, we would require the fitting to rotate 2-4 times a minute. I am also wondering if these could be used with flexable gear racks, which we would wrap arouind the inside of the lantern. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1146
Registered: 10-2004
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| Posted on Wednesday, November 4, 2009 - 9:07 am: |
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Andrew, we have a number of MFA geared motors that would be suitable for driving the lantern from a central fixing point. Is there a particular reason why you would want an orbital type drive using a gear rack around the circumference? We do not supply flexible racks but if it is a standard MOD rack, we will be able to match a drive pinion and motor to suit. |
Chas Krueger
Unregistered guest
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| Posted on Wednesday, November 11, 2009 - 12:27 pm: |
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Hi guys
I need to get the output from an RE540/1, 13360rpm 12v 21w out to a 5mm shaft at about 2500rpm. What bits would you advise I buy. With a 3.175mm spindle I don't seem to find any product (gear wise, plastic or steel) that will fit in order to get a reducion.
TIA
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Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1152
Registered: 10-2004
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| Posted on Wednesday, November 11, 2009 - 9:37 pm: |
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Chas,
We would recommend purchasing one of our geared motors 1450-051 that will give 2633 rpm at 12V and uses a 540/1 motor. These geared motors have a 6mm shaft so adapt to 5mm with our coupling 4604-007. |
Brian Barden
Unregistered guest
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| Posted on Thursday, November 19, 2009 - 12:13 pm: |
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I am building a sternwheel paddle boat and since i am very restricted for space i am considering using the RE 280/1 part number 1450-043 x 2
My question is (Without any obligation on your part)do you think these motors and gearboxes will do the job?
The boat is 1200 long and i will be using 9.6 volt supply since i already have the equipment from my other boats.Appreciate your help on this matter.Kind regards Brian Barden |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1155
Registered: 10-2004
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| Posted on Thursday, November 19, 2009 - 8:32 pm: |
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Firstly, we know very little about boats so our opinion could be quite wrong. A boat 1.2m long is big and must be quite heavy yet you have chosen motors of only 1.6W. Do you have any idea of the torque required to turn the paddles and at what RPM?
We have customers with prop driven boats using 80W motors.
Regards
Paul |
Rob-o
Unregistered guest
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| Posted on Tuesday, December 8, 2009 - 2:57 pm: |
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Hi Paul
Shjould I buy the MFA385 or the MFA540 11:1 gearbox / motor for my robot? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1175
Registered: 10-2004
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| Posted on Thursday, December 10, 2009 - 5:59 pm: |
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Rob, sorry but how can we possibly know? You have not advised the robot weight, speed, wheel diameter, robot application. Let us know and we will try and help. We are also unable to reply to you personally as you did not leave an Email address. |
James Chapman
Unregistered guest
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| Posted on Friday, December 18, 2009 - 2:17 pm: |
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I am motorising a Peco plastic turntable (oo gauge model raiways) Basic requirements are
1/ spindle size, into bottom of turntable= force fit meccano axle or no. 8 gauge wire
2/ 12 volt dc motor
3/ very slow revolutions either achieved through motor or gears/pulleys
4/ probable weight for motor to turn 350 gm Perhaps you could let me know a price Jim |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1180
Registered: 10-2004
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| Posted on Tuesday, December 22, 2009 - 7:39 am: |
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James,
All of our motors on the website. They tend to have standard size shafts, what diameter do you need?
You say very slow but you really need to quote the rpm, from that we can select the closest to it. If you need slower, then you will need further reduction which we assume complicates matters for you. How would you attach say a pulley to the turntable and is the turntable already on bearings? |
Lord_asriel (Lord_asriel)
Member
Username: Lord_asriel
Post Number: 1
Registered: 1-2010
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| Posted on Tuesday, January 12, 2010 - 11:50 pm: |
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Hello! I would like assistance on what combination of items I should buy. I am making no robot; rather, a Sailor Moon Star Locket. If you care to find out the details, you can watch http://www.youtube.com/watch?v=fFuihwWgZLI ; the point is, that I need a motor/gear combination that is the smallest possible, will be able to operate on 1.5V (so that the battery can be small too), and have a final rpm of 0.1-0.3. Economy would be nice, but is secondary to small size and low rpm. So...what should I get?
After some searching I found that the solarbotics GM2 offset motor may be a good idea along with the no 4600-036 mini
worm drive set, right? That would make a nice 0.2 rpm at 1.5V...am I thinking right? If so, what else would I need? This motor's shaft is 4.7mm?? What kind of converter would I need to get the 2mm needed for the worm? Would I also need a coupler and additional shaft so that the gear of the worm does not touch the
rest of the motor case? What else might I need that my lack of experience does not reveal me?
Any help is very welcome! |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1187
Registered: 10-2004
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| Posted on Saturday, January 16, 2010 - 11:17 am: |
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Hi,
Sorry but I must be missing something here, your link is to a locket that is small enough to sit in the palm of your hand, motor GM2 is probably bigger than the whole locket. Also, its rpm is in the hundreds, not under 1.
Are you intending to conceal the motor drive within the locket? If so, you need to be thinking miniaturisation. Do you have any idea of what torque you need from the motor?
You are unlikely to find a geared motor that offers the reduction ratio you need in such a small size. You will need to further gear it down to get the final rpm you need. Have you looked at 1451-007 (GM10) to see if that might be suitable with further gearing? |
Alec Smith
Unregistered guest
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| Posted on Monday, January 25, 2010 - 9:40 pm: |
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Can you recommend a 12V dc motor that would fit a childs ride on jeep? Part number I have is XH-RS550(5152E)-50W.
Any equivalent would do! Its about 65mm long and 35m diameter.
Thanks!
Alec |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1192
Registered: 10-2004
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| Posted on Wednesday, February 3, 2010 - 6:37 pm: |
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Alec,
All of the motors we stock are shown on our website. 50W seems really small even for a childs ride on, does the motor have an integral gearbox, what rpm do you need?
Regards
Paul |
BARRY GOLDSWORTHY (Barrygoldsworthy)
Member
Username: Barrygoldsworthy
Post Number: 1
Registered: 2-2010
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| Posted on Wednesday, March 3, 2010 - 1:39 pm: |
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Hi;
I am trying to lift a 3 k.g. load using a 2mm pitch screwthread
(as found on scissor jacks ).
I need to use as low a voltage as possible as I need to keep the battery pack as small as possible.
Can you recommend a small gear motor that could do this.
I calculate I need about 200 to 250 rpm to achieve the ideal speed of lift.
Small is key word here.
Please see attached drawing.
Thank you very much in advance.
Barry.
 |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1217
Registered: 10-2004
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| Posted on Thursday, March 4, 2010 - 8:35 am: |
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Barry,
The battery size is generally determined by the voltage, running time and to a lesser extent the motor size.
The motor size will also depend on the screw jack efficiency which can be improved using a quality ball screw rather than a simple machine screw threaded bar.
You will need to calculate the torque required (use Google) for a screw lift. I found one website that for a given 25% efficiency came up with 377g/cm. If this was correct, our motor 1450-103 would be plently large enough. This is really a calcualtion that you need to do yourself as part of your design process. If you come back with a confirmed torque figure, we will try and match a motor to it. |
Dave Mills
Unregistered guest
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| Posted on Tuesday, April 27, 2010 - 8:02 am: |
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Im looking for the smallest motor for a tiny model loco. Are there any reduction gears available for your 4mm pager motor please? Ideally a worm reduction or possibly an epicyclic gear or roller drive as I don't want a large gearbox. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1245
Registered: 10-2004
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| Posted on Friday, April 30, 2010 - 9:29 am: |
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Dave,
Have you seen our geared pager motor 1451-014 or 1451-007 to see if these would be suitable. |
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