Well.. 400rpm at the wheel with a 7:1 means 2800 rpm on the actual motor. With the 32 magnets the e-rpms is 2800 * 16, which comes down to 750 Hz.neptronix wrote:There are 8 magnetic sections here... even if it's a 7:1 reduction, consider that a 16 pole 5:1 MAC motor will spin up to 560rpm at the wheel, at least, on an EB3 infineon-like controller. That's a pretty insane eRPM..Lebowski wrote:pitty I don't have a second controller lying around (like I put on the recumbent, 100 to 120V, about 30 to 40A rms)
the 1000uH is really crazy, how much erpm does it do for 400rpm wheel speed ?
How do i know? i hit 45mph on a MAC 8T on 72v.
So I don't think that eRPM is a limiting factor here..
At 750 Hz the impedance of a 1000uH inductor is 4.7 Ohm. So with 15A the voltage drop across the inductor is 70V.... hardly any room left for backemf.
The erpms are not the problem, the large inductance is.