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60V AC input to get a stable DC[<100V]

Hi,

My customer is designing an  BLDC sensorless solution  The  supply input is 60V AC, asking for a solution to output a stable DC which is not higher than 100V to supply a 200W BLDC motor.  Motor speed need to reach 20000 PPM, so a stable DC bus is very important. would you please recommend a solution to meet this requirement? thanks.