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Current readout circuit problem!

Question asked by cheung.jacky.001 on Aug 17, 2014
Latest reply on Aug 18, 2014 by cheung.jacky.001

Gigi or Dino:
       I met a strange question, motor parameter in STM3210E+ MB495 successfully entered the closed loop control. Now I redesign custom board,

      The open loop mode debugging hardware correctly, when the switch into the normal mode, the motor open-loop liters of normal speed, but has the obvious noise, finally can not enter the closed loop mode, display the start-up Error.

     The design of current sampling circuit, whether a rule? I oscilloscope display, amplifying the input 410mv 590mv circuit output amplification ratio 1.46, excuse me whether my T-noise with T-rise did not cause a good?