Starter moter

[maddox]

If youre strapped for cash, and still want to build a robot, then startermotors arent realy the way to go.
For the same amount of money you can get some wipermotors. With 4 or 6 you can get a heavyweight moving, giving more controle and upgrade possibilities in the future.It wont be fast, but you can use smaller cheaper batteries and due the low speed On/off relay control can be used.
And speedcontroling startermotors was a disaster, as my first robot used a startermotor, so I speak from experience.It isnt cheaper.

[jamesb]

my new (well, havent actaully started it yet but got the bits sitting on the table) featherweight uses a starter motor.

wont say any more than its name.....

Trauma.

[mute]

Or you could call it Fireball

I can almost smell the Nicads burning already.

[jamesb]

who said it had NiCads????

yeah ok, it does :sad:

go away..... snot fair.... blub.

(being serious though, Im not daft, Id thought of the current requirements.)

[big_nipper]

Starter Motor 4kG, battereis to run it for 5 min 2kG, over half the weight gone, doesnt leave much left for anything else.

When we got the Litton Motors they were £35 each. Pitty the CIM2s are more but they are better built. Starter Motors can work but are very unreliable and this is probably why hardly any are used. To use them you really need a current limit.

[leorcc]

In all fairness, i do not recommend starter moters in a robot, not for drive at least. Not because they are unreliable because the ones ive used in 2 robots were very reliable and powerfull, but simply because there too hungry for amps, and speedcontrol is virtually out of the question.

We had a 40Ah SLA battery on board, 2 startermotors for drive, and we could barely make it last the 5 mins in a fight. We had heaps of power though, and loads of torque.

--
Leo

[leorcc]

mine drew well over 180 amps during acceleration, and about 100 during driving.