[ \beginbmatrix f_d \ f_q \ f_0 \endbmatrix = \frac23 \beginbmatrix \cos\theta & \cos(\theta-120^\circ) & \cos(\theta+120^\circ) \ -\sin\theta & -\sin(\theta-120^\circ) & -\sin(\theta+120^\circ) \ \frac12 & \frac12 & \frac12 \endbmatrix \beginbmatrix f_a \ f_b \ f_c \endbmatrix ]
| Feature | PMSM | BLDC | |---------|------|------| | Back-EMF | Sinusoidal | Trapezoidal (flat top 120°) | | Current waveform | Sinusoidal, in phase with BEMF | Rectangular, 120° conduction | | Torque ripple | Low | High at commutation | | Control | FOC or ( i_d=0 ) | Hall sensors + six-step | Electric Motor Drives Modelling And Analysis Krishnan
Pair with “Control of Electric Machine Drive Systems” by Sul (Wiley, 2011) for modern digital control and sensorless methods. 8. Conclusion R. Krishnan’s “Electric Motor Drives: Modeling, Analysis, and Control” is a classic, rigorous, and highly teachable text. Its core strength lies in a systematic, step-by-step derivation of dynamic models and control loops, making it excellent for graduate students and practicing engineers transitioning into drives. [ \beginbmatrix f_d \ f_q \ f_0 \endbmatrix
Use MATLAB/Simulink with the “Specialized Power Systems” library to replicate Krishnan’s examples. Report compiled based on the first edition (2001). For latest updates, check if Pearson released a revised edition (as of 2025, no second edition exists, but the book remains in print). Report compiled based on the first edition (2001)