Asked
— Edited

For my upcoming project(no hints, but cardboard is a material) I need **2 12v dc motors** to be run off the h-bridge in the store, which means the **max motor amperage is 2.5Amps.**

Size isn't big but the robot will be mid-sized. ** 5 pounds or so of torque per motor if possible.**

If it could have a wheel that would be awesome!

Anyone who can link me to some motors will be put on the credits list for the future bot.

Thanks guys!

#3Troy, I like the site but I priced the stuff needed and it's almost $100.

Any other sources are appreciated.

#4www.ebay.ca/itm/Roomba-Discovery-Primary-Drive-Wheel-Assembly-/380235547224?pt=LH_DefaultDomain_0&hash=item5887ce0258

Or this?

www.ebay.ca/itm/Roomba-500-Series-Left-Wheel-and-Motor-510-530-540-/200754973319?pt=LH_DefaultDomain_0&hash=item2ebdedca87

#5www.ebay.ca/itm/300rpm-Playmobile-Assembled-Tire-Driving-W-37GARH-DC12V-Electric-Speed-Motor-/161096782513?pt=LH_DefaultDomain_0&hash=item25821dd2b1

Will it work? I plan to pwm it down if I get 2. Has enough torque. 2 motors =9 pounds of torque. Plenty!

#6#7www.ebay.ca/itm/12V-200r-min-Playmobile-Assembling-Tire-Drive-With-37GARH-DC-Electromotor-/161096790486?pt=LH_DefaultDomain_0&hash=item25821df1d6

#8#9www.goldmine-elec-products.com/products.asp?dept=1300

You might look at this one.

www.goldmine-elec-products.com/prodinfo.asp?number=G17949

#10What does everyone think of this motor and wheel?

www.ebay.ca/itm/12V-200r-min-Playmobile-Assembling-Tire-Drive-With-37GARH-DC-Electromotor-/161096790486?pt=LH_DefaultDomain_0&hash=item25821df1d6

#11(edit our last two messages crossed)

#12This one might be in your speed range.

#13#14#15The circumference is the distance traveled per revolution.

Divide your revolutions per minute by 60 to get turns per second.

Say for instance you have a 3" wheel and a geared motor going 120 rpm.

120/60 is 2. The circumference is 9.42. So 2 revolutions of 9.42 is 18.82" per second. Kinda zippy.

Granted that the rpm rating is when not under load but you can get a better picture of how fast it may go.

#16#17Just my opinion.

Edit. I just looked at the link you had. I didnt realize the speed was already in there with the wheel size. Unless Im missing something Im coming up with over 32K mm per second.

68mm tire size X 3.14 X 152 rpm = 32455mm per sec or 1277.7559 inches per sec or 106.48 feet per sec. Im a bit tired it seems.

EDIT: I slipped up and didnt realize I forgot the answer was per minute not per sec.

#18#19Got my ping sensors from china last night and inspected them. Some for roli mega, the others for my next bot.(trying hard not to spoil the surprise!)

#20Product Name: Mini DC Tyre Motor Assembly; Motor Model: 37GARH; Voltage:12VDC; Rated current: 1.1A;

Motor No load speed: 200r/min; Motor rated speed: 152r/min; Motor rated torque: 2.8kg.cm; Tyre: 68*27mm(D*T);

Shaft:Dia 37mm Long; Motor Speed: 65*3.14*152mm/s; driving force: 2.8÷3.25kg

Total Size: 65*104mm(D*H); Material: Metal, rubber; Color: As picture shows;

Weight: g; Package Content: 1 X DC Gear Motor + 1 X coupling + 1 X stand + 1X tire;"

www.ebay.ca/itm/12V-200r-min-Playmobile-Assembling-Tire-Drive-With-37GARH-DC-Electromotor-/161096790486?pt=LH_DefaultDomain_0&hash=item25821df1d6

#21#22