Motors for a featherwight battlebot

[leorcc]

Motors for a featherwight battlebot

he already has.

[Guest]

Motors for a featherwight battlebot

now im gonna juse 2 gold motors to power my 4 weels. 1 or 2 HTI motors to power my spinning disk. and SANYO 3600 nimh accus. and make one blok of accu (14.4 volt to power my motors.

is this ok?

[dragonmaster_1]

Motors for a featherwight battlebot

I would use 2 HTI motors for the Disc

[Guest]

Motors for a featherwight battlebot

ok... but do i have enough on one accu, if i power al my motors whit one accupack... (i wanne use an accupack whit SANYO 3600 nimh on 14.4 volts)

[leorcc]

Motors for a featherwight battlebot

I think it will do, if you get the gearing right. The lower the rpms your motor due to a too a poor chosen gear ratio, the more amps you will draw. And with four wheel drive which tends to draw more current to make corners anyway it is very important to keep a good gear ratio.

I dont know the specs for the HTIs exactly but they seemed like high power drillmotors to me. As long as they get the disk quickly up to speed, the current draw should drop quite quickly.

All in all it will be close, but I think 12 cells should do it. Specially since those Sanyos are great cells, they do pack a punch.

[leorcc]

Motors for a featherwight battlebot

While on the subject of motors. I just bought a second hand Astro cobalt 940. I saw on the Astroflight website they are discontinued, anyone know a place where i might find a replacement in case of an emergency?

[craig_anto]

Motors for a featherwight battlebot

try team whyachi

[dragonmaster_1]

Motors for a featherwight battlebot

we use a 5 to 1 ratio on the HTI for the Disc 6 to 1 would probaly be better they get up to speed very fast about 2 seconds.

[geoff]

Motors for a featherwight battlebot

According to the Astroflight site the 940 is still listed. http://www.astroflight.com/e/env/store/store-Industrial.html?sid=0001a0PRDdPofIgqdM7S401&link=/store/store-type-tem.html&item=products:af-940http://www.astroflight.com/e/env/sto...001a0PRDdPofIg qdM7S401&link=/store/store-type-tem.html&item=products:af-940

They have changed the design slightly but it is still the same specs.

[Guest]

Motors for a featherwight battlebot

but my voltage to the HTI motors is 14.4 volts, and kishar juses 24 volts...will 14.4 volts be enough? (my disk is gonna weight +/- 2 kilos)

and sould i juse beld or chain from my motors to my disk. (i planned to juse 2)

[leorcc]

Motors for a featherwight battlebot

More volts is better in your case, but it is still possible. How much weight do you have left? Belt drive is better for the disk motors.

[Guest]

Motors for a featherwight battlebot

im still disining the robot on paper (its my first one im desining by myself) i have not calculated the weigh jet, but im gonna do it soon...

and from the gold motors to my weels also beld or is it better to juse chain then?

[dragonmaster_1]

Motors for a featherwight battlebot

Stats for HTI
Power 0.35 hp @12v 1.43 hp @24v
Torque 0.47 lbf*ft @12v 0.97 lbf*ft @24v
Efficiency 70% @12v 76% @24v
Speed 1260 RPM / Volt
Voltage 12 volts or 24 volts*
Weight 11 oz.
Output Shaft 5mm dia x .75 long
Diameter 1.7
Length 2.8 (from face)
Face Mount 2 M4 holes 1.14 apart

[leorcc]

Motors for a featherwight battlebot

I would stay away from chain drive. Specially in a feather, since chain is heavier then belt, and the motors tend to get less of a beating.

Now I know there are several robots out there with chain drive and perform very well and yadayadayada, but it is still better to have belt drive.

[Guest]

Motors for a featherwight battlebot

ok so its beter to juse belt drive everywhere...
i will take a look how the HTI motors will preform on 14.4 vols, and if it prefomes bad ill take 24 volts...