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I guess you'd begin with determining the motor output voltage
(RPM and constant) and the boost ratio to get 600V + delta
(diode drop, series resistance, braking current) which with
an assumption about converter operating mode (conduction)
ought to get you a duty cycle from boost converter basic
equations.
Treat the motor as a voltage source and it's pretty much
a straightforward boost converter (about any given operating
point; the range and transitions are where it looks to get
interesting).
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