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Advanced Control Strategies for Brushless Drives with PWM Modulation and Vector Control

This document discusses advanced control strategies for AC brushless drives utilizing Pulse Width Modulation (PWM) and a SinCos encoder for speed and acceleration management. It highlights the significance of regenerative braking, sinusoidal waveforms synchronized with line voltage, and amplitude modulation techniques. Emphasis is placed on Feed-Forward and PID control mechanisms to achieve high dynamic performance by minimizing integral action. Additionally, the document explores Vector Control (VC) methods, particularly through Clarke and Park transforms, for effective current management in motor control applications.

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Advanced Control Strategies for Brushless Drives with PWM Modulation and Vector Control

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  1. Drives(Azionamenti )

  2. PWMModulation(Pulse Width Modulation)

  3. Sincos encoder o [velocita’] [accelerazione] oscillatore AC brushless drive

  4. Regenerative Breaking(Recupero in rete) Sinusoid in phase with line voltage and amplitude-modulated with DC-bus voltage error [vel] [acc] PI [vel] Tensione DC bus letta PI f0 = 256 frete 50 o 60Hz 1 sinusoid cover 256 memory locations

  5. Control Strategies Feed Forward and PID • The Feed-Forward (open loop) is used to provide position, velocity, current profiles, to be followed by the PID (closed loop), • …so to avoid to load the integral action, • …so that I can keep it low and have high dynamics

  6. position velocity acceleration Higher bandwidths Feed Forward and PID Control Strategies (cont’d)

  7. Control Strategies (cont’d) Vector Control (VC) (Controllo ad Orientamento di Campo o Vettoriale)

  8. Control Strategies (cont’d) Vector Control (VC)

  9. w Iq Id Ia Ib Ic Control Strategies (con’d) Experimentally we would see… :

  10. …and indeed we actually see:

  11. and:

  12. Clark & Park Transform • It’s the matrix T that transformsfrom 3 to 2*vectors • and from fixed to rotary reference system. • * Actually 3 currents id, iqand i0, remains, where i0is the neutral wire (neutro) current (if there’s one).

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