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Re: (ET) more off topic power wheels jeep help...

This is extremely important.
The only braking on the PW is via the regen/plug braking. If you don't have that, then the thing will be like an E-20 after you bounce in the seat. Think "runaway". Now think "4 year old"
If you break the gearbox, consider it the final end of a "safety fuse". Once you start getting up to serious speeds, things like the complete lack of suspension and stuff like the very stamped metal steering assembly could lead to failures. With kids on board this is going to hurt.
As for myself: I replaced the wimpy Fisher Price batteries with a single 26ah Hawker Genesis in the rear and a 13ah one in the front. The 13ah battery gives some ballast to the front end, and together they go for a nice long range. The voltage also does not sag, which keeps current levels down. 

Chris


Dave Reuter wrote:


One think to watch out for. The braking on the Power Wheels is by shorting
the motor leads together so when the "Acel" pedal is in the off position
any generated voltage from the motor is feed back into itself causing the
motor to electromagnetically lock up. If the vehicle can not skid the
wheels this will also bust up the gear box. The faster you get it going the
harder this braking application will work.

Dave Reuter


----- Forwarded by Dave Reuter/IAVINC/IAV on 04/05/2004 12:23 PM -----
Chris Zach <czach@computer.o rg> To Sent by: "Chapin, Tim" <tchapin umich edu> elec-trak-bounces cc @cosmos.phy.tufts elec-trak cosmos phy tufts edu .edu Subject [RMX:##] Re: (ET) more off topic power wheels jeep help... 04/05/2004 12:04 PM 



Look at your Elec-Trak. It has the same logic; that's what all of those
relays and contactors and resistors are for.

If you slam an E20 into full power the resistors absorb the jolt.

As for the transfer cases, they will break really soon now. On the EV
list we have been working on this, and they apparently have the main
gear's axle snap at around 18-24 volts. Weight of kids makes a
difference too; if it can't wheelie it will snap.

Are you running the motors in series or parallel?

Chris


Chapin, Tim wrote:


Thanks for all the answers on the 12 volt battery..  The Barbie rat jeep


is


now cooking on 18 volts (combo of 12 and 6 volt batteries). High speed up
from 5 mph to around 8 mph Starting to wire a TURBO switch for short


burst


of 24 volts.. shooting for over 10 mph (wife hates the idea but hay....


more


power)..
At 18 volts I am starting to worry about the plastic gear box holding up.
The kids are doing rev. slams to get it to pull wheelies.  The power


wheels


idea of a controller is an on/off switch.  Is there a easy/cheap way to
build a board that would ramp up the volts when the power is sent to the
motors...  Something that might start at 1/3 voltage then jump to 2/3
voltage then full power..  Just something that would ram up the power a
little instead of complete tork at once..  I said easy because I have


little


electrically experience so I need the kis approach. (keep it simple)

At this point the e12m won't keep up...  Maybe...  No...   Still need the
old girl to mow the lawn....

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