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Technical Lecture

AC, DC, BLDC Motor Drives

T16.1 - PMSM Motor Drive with Current Direct Digital Control and Near 1st-Order Speed Control

Wednesday, March 19, 2025
8:30 AM – 8:50 AM ET
Location: Level Three, A314
This article presents a permanent-magnet-synchronous-motor (PMSM) drive with the three-phase three-wire inverter current direct digital control (DDC). The DDC achieves high accuracy and fast response, and expresses duty ratios as analytical functions. It can handle the motor torque and speed control effectively. Thus, this article also derives the simple speed-control law based on deadbeat and disturbance-observer-based control, achieving near 1st-order response. Besides, the low-speed cogging torque issue is addressed with the virtual cogging torque (VCT) control. Experimental results confirm the accurate and fast current/torque tracking, near 1st-order speed response, and stable low-speed VCT control.