9546Re: [solectria_ev] RE: surging/vibration
- Dec 6, 2013Worn spot on the throttle pot... Are those pretty generic? Are they expensive? Does it need to be something special since the regen is tied into it? Would it be worth getting one to swap it just to see if anything changes? Half of my daily drive is at 55 and there is a sensitive spot in the pedal at that speed, barely moving it causes a big change in touque. Come to think of it, steady at 55 may be the same throttle position as accelerating from a stop.
No, now that I think about it the vibration is across a wider range of accelerator travel. But if the price of a new throttle pot isn't too scary it might be worth a try.
From: Wolf <wolf@...>;
Subject: Re: [solectria_ev] RE: surging/vibration
Sent: Fri, Dec 6, 2013 8:13:27 PM
Not quite sure I buy that, sounds like Tesla needs to adjust their field weakening model...
The jerking when moving at speed in Solectria vehicles is more likely to be a worn spot on the throttle pot, which tends to happen around typical cruise speeds.
Giving more or less throttle moves you out of the worn spot.On Dec 6, 2013 10:12 AM, <joeboxbaytown@...> wrote:
I read where some Tesla owners had questioned surging/vibration at a certain speed. their tech support said it was normal with induction motors. it was something about magnet motor poles jerking on the rotor as the controller fires them off. Slanting the rotor bars in the induction motor design buffers this but is less effective at certain rpm because of some geometric anomilie between rotor and controllers rotating magnetic field . The motor moving in step can jerk wheel back and forth such as it pulls one way aceleration and other engine brake.
Tritium ws 200 manual says having wrong weight in programing can cause oscelation with control loop. dont know if it applys not familiar with your setup
hope this helps
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