Hey Lee, I'm always fair. I'm picturing an S10 with a 11" motor. Your foot in it, shift it a couple times and get out and sweep up the pieces of u-joint on the ground. You can choose an action and nature's law will choose the consequence. With an ICE, you have the cushion of the clutch or torque converter, but with an electric motor hooked up direct to the wheels and full torque at zero rpm something has to give.
--- On Thu, 4/11/13, Lee Hart <[email protected]> wrote: From: Lee Hart <[email protected]> Subject: Re: [EVDL] Reversing Contactors Yet Again To: "Electric Vehicle Discussion List" <[email protected]> Date: Thursday, April 11, 2013, 11:59 PM On 4/11/2013 11:02 PM, Dwain Swick wrote: > I always built my conversions with a solenoid connecting power from the > controller to the motor and the throttle controlling the solenoid. When the > throttle was off the power was off. If you reversed with your foot in the > throttle, then you deserved what you get. Where is common sense and safety? To be fair, there are sometimes reasons to switch rapidly between forward and reverse. When you're stuck in snow for example, you may need to "rock" the car forward and backward every second or so to it unstuck. Warning: a quirk of series DC motors is that you do not want it rotating slowly in the wrong direction when you apply power. When rotated backwards from the direction it wants to run as a motor, it becomes a series generator. Unless your controller is set up for regen, it can't control the generated current. The motor can generate a huge current, to murder the freewheel diodes in the controller, or break something in the drive train. -- The principal defect in a storage battery is its modesty. It does not spark, creak, groan, nor slow down under overload. It does not rotate. It works where it is, and will silently work up to the point of destruction without making any audible or visible signs of distress. -- Electrical Review, 1902 -- Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130411/a8ce7b1d/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
