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

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

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

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

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

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

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

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

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

Control settings

Control settings

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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