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

["Dave Reuter" <david reuter iavinc com>]

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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