Kein Folientitel

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Control of PMSM drives for traction applications
Speaker Magyari Györgyi-Karola
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Contents

• PMSM drives classification
• brushless a.c. drive controls
• control loops with PID-type controllers
• rules for the controllers settings
• conclusions

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PMSM drive classification

• with respect to current waveform
• voltage-frequency correlation
• motion sensor presence

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PMSM drive classification

• From the point of view of the current waveform
• rectangular current control brushless d.c.
  motor dive
• sinusoidal current control brushless a.c.
  motor drive

Rectangular and sinusoidal current control
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PMSM drive classification

• Brushless d.c drives
• q1
• concentrated coil stator windings
• surface magnets

• Brushless a.c drives
• q1
• distributed coil stator windings
• surface and interior magnets

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Brushless a.c. drive control

• scalar control (V/f) a damper cage on the rotor
  is required, there are no motion sensors low
  dynamics applications
• vector control (current or current and voltage)
  faster dynamics applications
• direct torque and flux control

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Brushless a.c. drive control
Basic vector control of PMSM 1 - with motion
sensor 2 - sensorless
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Control loops

• to control currents, speed, position in PMSM
  drive
• heavily affects the performances of the drive
  system
• to optimize the time domain step response of the
  system or the
  performances in the frequency
  domain

PI-type controller
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Rules for the control settings

• symmetrical optimum (SO)
• a PI controller is designed to control a system
  with an I-element
• absolute value optimum (AVO)
• a PI controller operates in a control system
  with one long delay time and a sum total of
  smaller delay times

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Control settings
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Control settings
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Conclusions

• each control loop can be adjusted efficiently and
  independently
• multiple delay times can be reduced or canceled
  for the higher level controller with compensation
  in a lower level
• disturbance variables will be corrected in lower
  level control loops
• internal control variables can be limited through
  the command variable
• each additional control loop introduces delay
  time to the higher level, so the changes in the
  command variables need more time to be corrected

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Thank you for your attention!!!