Figure 2. Typical trapezoidal back EMF and sinusoidal current waveforms of 3-phase PMBLDC motor

From

A New Approach to Enhance the Torque Handling Capacity of a PMBLDC Motor Drive

Protik Chandra Biswas, Bashudeb Chandra Ghosh

American Journal of Electrical and Electronic Engineering. 2016, 4(6), 164-176 doi:10.12691/ajeee-4-6-3