Torqueing similarity/differences between PMSM, FOC BLDC motors and SEDC/PMDC motors

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ECE 4/5630 Electric & Hybrid Drive Systems Prof Ka C Cheok

Torqueing similarity/differences between PMSM, FOC BLDC motors and SEDC/PMDC motors (15 pts)

The torque generated by a PMSM by, is the (positive) magnitude of . If we control the angle such that , hence , then the PMSM becomes a Field Oriented Control BLDC motor generating the torque as . On the other hand, the torque generated by a separately excited dc motor can be expressed by (refer to lecture notes). For permanent magnet DC motor, .

BLDC vs SEDC