MTPA With Pseudo-FOC Strategy–Based BLDC for Minimization of Copper Loss and Torque Ripple

Abstract

Brushless DC (BLDC) motor drives are extensively preferred in the automotive industry for their high torque-to-weight ratio. In conventional BLDC drives, the torque ripples are high due to 120° conduction mode operation and nonideal back EMF. To minimize the torque ripple in BLDC drives, a flux trajectory is employed based on the extension Park transformation d-q axis frame. This article introduces a control scheme for BLDC drives that integrate maximum torque per ampere (MTPA) with pseudo–field-oriented control (FOC). This approach gets an optimal reference d-axis current (Ids∗) that optimize the current magnitude Is2) and minimize copper loss. Furthermore, the 180o conduction mode is used to minimize the torque ripple and provide high dynamic performance of drives. The efficacy of the proposed MTPA-based pseudo-FOC strategy is experimentally validated by employing a 0.75-kW BLDC motor drive using real-time interface controller dSPACE 1202 and Danfoss VLT 302 converter.