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Control of PMSM drives for traction applications

Control of PMSM drives for traction applications. Speaker : Magyari Györgyi-Karola. PMSM drives classification brushless a.c. drive controls control loops with PID-type controllers rules for the controllers settings conclusions. Contents. with respect to current waveform

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Control of PMSM drives for traction applications

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  1. Control of PMSM drives for traction applications Speaker : Magyari Györgyi-Karola

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

  3. with respect to current waveform voltage-frequency correlation motion sensor presence PMSM drive classification

  4. 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

  5. Brushless d.c drives: q=1 concentrated coil stator windings surface magnets PMSM drive classification Brushless a.c drives: • q≥1 • distributed coil stator windings • surface and interior magnets

  6. scalar control (V/f): a damper cage on the rotor is required, there are no motion sensorslow dynamics applications vector control (current or current and voltage): faster dynamics applications direct torque and flux control Brushless a.c. drive control

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

  8. 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

  9. 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 Rules for the control settings

  10. Control settings

  11. Control settings

  12. 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 Conclusions

  13. Thank you for your attention!!!

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