e-vektor wrote: ↑
Oct 11, 2018 2:58 pm
sanfox wrote: ↑
Oct 09, 2018 1:55 pm
ME1304 has 8 magnets (4 poles). It's possible to try to rise up headroom factor to 95%.
The field wekeneeng must begine to work when headroom factor reach up set value. You can get 10% plus power if you encrease headroom factor.
ok, I'll try next Monday. Today I expent almost all day charging the batteries with the "Lipro" chargers (12 x 6S x 16Ah), and tomorrow is a holliday here. But I think it should give some extra power.
Finally I did the "last" test, 100V just charged and cool morning (and motor):
I increased the mod. index to 95%, and it gave 39.9 HP at brake, and about 42.5 HP at motor (estimated). I is about 2.5 HP more than the last test, but the torque and HP graphs changed a lot. Actually TQ has the same pattern (first fast decay, then slow), but at least it happens a bit latter (higher rpm). Probably this could be patched at F.W. settings, but by now I am not going to continue as my target for race setup is 28-30 HP. This is only for demo mode.
Note: the motor can reach more than 5000 RPM, but with a "fixed brake" test it starts to be too slow, although I prefer the "fixed brake" for this motor because the resulting graphs are much smoother than with the PID control
Regarding the efficiency, it is important that in the karting race track the gear allows the motor to be always over 1000 or 1500 RPM to have at least 60% efficiency (full torque: 550A, with less torque eff. is better, see the thin graph for 100A)
So the best results would happen when the kart is running between 1500 and 4000 RPM in the corners area, and then it can reach 5000 RPM or more in the finish line (with less torque at the end)
There still are things that could be improved: in all tests battery voltage decreases up to 89V at full power (green graph), so with better batteries and wiring maybe it can have 5V more and have more power. Also the coefficients could be adjusted a little, but I think 41 HP is a good value for a "demo" setup, while for racing setup I probably limit power to 28-30 HP, but with a flat response to keep battery consumption "low"
(Iq is pink: max 550 A)