[piotrsko]

[quote=algea07;235396]i read on the Soliton manual that kostov motors were neutrally timed, where the warps are advanced timed, which meant that the kostov couldn't take as much amperage.[quote=algea07;235396]

UH, no, it means it can't take the extreme extra voltage, which is not true either so much because of the interpoles. Look also at the duty cycle: 250 amps continuous (60 min per hour) at either 196v or 250 v.

[DavidDymaxion]

The Kostov has interpoles. These are electromagnets between the main poles that help keep the fields aligned under high current and high rpm. The other way to do this is to advance the timing to the rotated state. The interpoles do alignment dynamically, so in theory are better at it. The flip side is the interpoles take up room, so the main field poles are smaller.

My old Kostov 11 inch is lighter than a Warp 11 (about 70 lbs lighter), the commutator is smaller, the brushes are smaller, and the brush leads are smaller. I would believe these are the bottlenecks for high currents, not the timing. BTW Kostov says the interpoles help the brushes lead an easier life, so they can handle more current.

Originally Posted by algea07

i read on the Soliton manual that kostov motors were neutrally timed, where the warps are advanced timed, which meant that the kostov couldn't take as much amperage.

i was planning a dual nine conversion can a nine inch kostov take 1000amps and what about 1400amps.

i'd like to be able to max out the soliton if i can, if i my car can handle it. drag racing isn't my primary concern but i'd like to go fast if i need to.

[Anman]

So not a lot of builds use kostov motor's although they seem nice. Is there something I am mssing?

[Jozzer]

I've got an 11" 250v in my MX-5, it's absolutely fantastic. I've only done a few hundred miles so far, so cannot yet comment on it's durability, but it seems to be taking it well so far. I've abused it as often as possible with up to 1000A @ 220v, and will be pushing upwards to 300v shortly when time permits.
The power of this combination motor/controller is nothing short of breathtaking..

I can manage 200wh/m round town if I try REAL hard, 250 with short spells of 50mph "freeway" mixed in.
400+ wh/m happens easily when your naughty.

Vehicle weight < 1100KG.

[DavidDymaxion]

That seems to be right. There were several notable failures (John Wayland tortured his to death), and others had some problems under heavy use. Recently I melted some brush gear on mine, but that's racing. These were all with the older motors. My understanding is the newer ones are better.

The Kostovs seem to like more voltage and less current, which is the opposite of most DC conversions that tend to go for less voltage but more current.

Originally Posted by Anman

So not a lot of builds use kostov motor's although they seem nice. Is there something I am mssing?