Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-11-13 Thread Chris Tromley via EV
On Thu, Nov 13, 2014 at 4:26 PM, Adam Chasen wrote: > Chris, > You are correct! I was able to confirm just by setting the PWM low enough > to see that the motor wouldn't continue to spin past a certain speed. > Looks like I am still running the 100% original Presolite 4001 MTA. I do > get it pre

Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-11-13 Thread Adam Chasen via EV
I was able to find a transformer in an old datacenter UPS which was very large. I also had some leftover 7 lamination flexible copper bus bar from the Chevy Volt battery teardown. I purchased some replacement shrinkwrap and wound it around 4.5 times. As the transformer I used had alternating E/I la

Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-08-12 Thread EVDL Administrator via EV
> On 08/11/2014 08:37 PM, Chris Tromley via EV wrote: > Also, I've never heard of anyone with an electric motor with a > manual transmission or direct drive that chooses to use the clutch. > That's generally considered an awkward work-around for a problem > that should be fixed. On 12 Aug 2014 at

Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-08-12 Thread Jay Summet via EV
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 08/11/2014 08:37 PM, Chris Tromley via EV wrote: > Also, I've never heard of anyone with an electric motor with a > manual transmission or direct drive that chooses to use the clutch. > That's generally considered an awkward work-around for a prob

Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-08-11 Thread Cor van de Water via EV
ic Vehicle Discussion List Subject: Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors On Mon, Aug 11, 2014 at 5:15 PM, Adam Chasen via EV wrote: > One solution is to use the clutch in the Leopard to ensure there is no > starting load on the motor. I still measured inrus

Re: [EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-08-11 Thread Chris Tromley via EV
On Mon, Aug 11, 2014 at 5:15 PM, Adam Chasen via EV wrote: > One solution is to use the clutch in the Leopard to ensure there is no > starting load on the motor. I still measured inrushes of >300A with no > load! That will not work for my directly coupled 1989 BMW. I am curious if > Lee Hart (wit

[EVDL] Protecting DC PWM Controller from low inductance/resistance motors

2014-08-11 Thread Adam Chasen via EV
I recently purchased a 1980 Lectric Leopard (Renault 5 “Le Car” http://www.evalbum.com/190) with the following specifications: * original Presolite 6.7”(?) series wound DC motor (presumably advanced for higher voltages) * 16kWh LiPo NMC packs in 24s4p arrangement for 90V nominal with 150A semicon