hello, I have 2 question:
1. is it possible to make (from available Stellaris components) custom BLDC controller for higher rates, eg: 36V and 900W ?
2. Would it be possible to measure realtime current characteristic with such controller ?
I wish to have elektro-bike controller application where I wish to change engine power based on biker's pedaling power contribution.
if my legs power is aprox 250W, motor runs on 100W (with max 900W limit), when I start pedaling, running motor should feel some XX% current decrease repeatelly on 50-70 RPM ( x 2 in fact) pedaling frequency. Bigger decrease = harder pedaling = put more power to motor until maximum.When stop pedaling (no repeated current decrease) = engine power decrease in steps to some minimal rate.
is it possible to to make such application with Stellaris ?
Suppose if one were to "sacrifice" brand new Prius to gain access to Toyota's "very own" power FETs/IGBTs - still could not support 900A. You did mean 900W - did you not? (hey - just a slight detail) Suspect that 900A conductor would be the size of racing bike's down-tube... Toyota has regularly increased the voltage of their BLDC motors - surely to lessen the conductive losses - naturally associated with high currents...
Can report that - using BLDC-RDK as first order, "model" our group has designed/produced working BLDC Controller able to reach to 70V at peak currents of 40-50A. The BLDC design may be "scaled" - but larger currents & voltages will require redesign of most all of the original, power handling portion of the kit. Kit is fine for its purpose - which does not extend to the region you seek - yet is an extraordinarily sound BLDC learning laboratory...
opps,... sorry for 900A, it is for sure 900W ;-), I'll try to edit my post.
ok,... I can ofcourse stay on 500W (24V),... 900W is rather for my ultimate comfort,....
So what then ? Can I make such application with Stellaris or not ?
RDK-BLDC is excellent teaching tool - Stellaris MCUs have proved capable of managing the critical points of such design.
Toyota - 4-5 years back - published an excellent review of their efforts in the Prius development. Recall that they felt the stress was so great upon commercial FETs/IGBTs that they developed their own! (no little feat) I mention that article as I believe it would be excellent for advising you in multiple aspects of your proposed task...
This idea for 1000 watts is way out there:
To bad no one has ever tried to run tandem RDK controllers in synchronous parallel using phase locked system clocks or a shared single clock source.
Humm - wonder how 3 phase synchronous stereo PWM would look like or if it would even work.
Need more watts just add individual power blocks on the stack -- hehe :)
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