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what does the PI output of controlSUITE mean?

byunghun moon
Intellectual 360 points

Other Parts Discussed in Thread: CONTROLSUITE, MOTORWARE

Hi I have some question.

Through the previous post, I know that controlSUITE and motorware are different.

I use controlSUITE , Vdcbus 300V,SVPWM,TMDSHVMTRPFCKIT.

.

1. what does the PI output of controlSUITE mean?

For example, what does  _IQ(0.5) of pi output(=Vd,Vq) mean? 

I want to know exactly about this.

.

2. if _IQ(0.5) is only a scaled value from DC bus voltage, _IQ(0.5) of pi output(=Vd,Vq) means the half of Vdcbus/sqrt(3)? 

.

Please give detailed explanation.
  • 0
    TI__Genius 17370 points
    Hello,
    I am writing to let you know that a C2000 team member has been assigned to this post and should be answering shortly.

    Regards
    Baskaran
  • 0 in reply to Baskaran Chidambaram
    TI__Guru** 117210 points
    1. The output of the current PI regulator is Vd or Vq, which are voltage vector on rotating frame that will be sent to the motor stator, the voltage vector is not a real voltage, it like the percentage of (nominal voltage/dc bus voltage). Often, we set the maximum output of current PI regulator is _IQ(1.0), so _IQ(0.5) is half or 50% of (nominal voltage/dc bus voltage). The motorWare is similar as controlSUITE, but the maximum output is _IQ(0.5) for current PI which means 100% of (nominal voltage/dc bus voltage).
    In controlSUITE, the scale voltage for FOC is the maximum measurable DC Bus/sqrt(3), so the real voltage for _IQ(0.5) of Vd/Vq from PI output is equal to 0.5*Real DC bus voltage.
    2. For FOC using close loop control of speed and current on fixed point, the system uses scale method, to change pwm duty to implement voltage vector output on motor stator. As item 1, _IQ(0.5) means half of maximum voltage vector on d/q-axis of rotating frame.