Team Thrifty /Fifty Build Diary for Bitza

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

*NOOB QUESTION ALERT!*

Got some nice drill motors for Bitza 2.0 but I think maybe I'm kidding myself that the 15a Electronize's will handle them.

Here's the spec sheet;

http://www.mabuchi-motor.co.jp/cgi-bin/ ... rs_775vcwc

We've got the 9013 but we're running at 22.2v, not 18v.

20.9a draw at maximum efficiency, the Electronize's can handle that in bursts but thought I'd offer it up to everyone else?

Could always reduce the output on the ESC.

[typhoon_driver]

Re: Team Thrifty /Fifty Build Diary for Bitza

What size wheels are you running them off?

The other thing to keep in mind is that chances are the wheels will lose traction and slip before they stall so the speedo won't ever see the full stall current from the motors. The electronize should have 15amp fuses in line with them (I usually up these to 20amps) which will blow before the speedos are screwed over.

Stalling a drill motor in boner during the champs when the left thread came loose, the fuses blew saving the electronize. So do some experimentation!

The other option is to remove the relay that the controller comes with and replace it with 2 30amp automotive relays.

[Danjr1]

Re: Team Thrifty /Fifty Build Diary for Bitza

im running 4 of those motors, each on a electronize 30a at 24v
worked it out at being around the 3.5hp overall

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

The wheels are 170mm, but they are geared after the drill motor gear box. Don't know the size of the cogs off the top of my head.

The Electonize's have 40a burst ratings, so I'm assuming a 20a fuse will have the same sort of life time as the burst.

I think you mentioned changing the relay before. One of them is sticking so it'll be worth changing them anyway.

Do I need to change anything else on the ESC other than the relay? I'm assuming it's just a 'straight' swap.

[billy breach]

Re: Team Thrifty /Fifty Build Diary for Bitza

where do you fit the inline 20amp fuse? before the speed contoller or before the motor?

[typhoon_driver]

Re: Team Thrifty /Fifty Build Diary for Bitza

You fit a fuse on the positive battery power lead to the electronize.

Yeah, it's just a straight swap. You have to desolder the relay which can be a pain then solder wires the holes left over, these lead out to the two relays that you are best mounting onto the plastic housing outside.

A featherweight would never be able to put 3.5hp into the ground unless it has magnets and even then, the motors will likely burn out before any meaningful time has passed.

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

540 for example........

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

Cheers Gary, I'll give it a bash and see how it goes!

[Mouldy]

Re: Team Thrifty /Fifty Build Diary for Bitza

oi

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

haha

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

Anyone know of a neat solution to get around the stupid half-travel when using the built in mixing of a Spektrum DX5E?

[PJ-27]

Re: Team Thrifty /Fifty Build Diary for Bitza

No one?

I other news! I've found the Como motors people are finding popular in Beetle's to really struggle on torque. To the point whereby my Beetle can't actually turn, because the friction from the tyres is too great. So I'm now in the rather odd situation of reducing the grip of the wheels....

What have other people's experiences of these motors been?

[Danjr1]

Re: Team Thrifty /Fifty Build Diary for Bitza

From what I've read, there isn't a fix for the half servo throws on the dx5i? I do recall somewhere on the net someone actually altering the insides of theirs but I could be wrong.

[harry hills]

Re: Team Thrifty /Fifty Build Diary for Bitza

ive spilled coke inside my dx5e and it didn't seem to help

[josh]

Re: Team Thrifty /Fifty Build Diary for Bitza

Use a mixer in line with your drive channels on board the robot and keep the dx5 mixing off. most dual motor controllers have a mixing function built in