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for traction applications

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

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

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

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

6 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

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 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

10 Control settings

11 Control settings

12 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

13 Thank you for your attention!!!

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