Implementation of a high-power-factor interior permanent magnet synchronous motor drive system with a small film DC-link capacitor

Abstract

This study investigates a small film DC-link capacitor inverter for a permanent magnet synchronous motor drive system. Two control methods, including a d–q-axis current control and a positive torque region current control, are originally proposed to improve the torque dynamics of the drive system. In addition, a damping compensation method is used to improve the input power factor and reduce the input current harmonics. A current-loop predictive controller and a speed-loop predictive controller are first proposed to improve the dynamic responses of the interior permanent magnet synchronous motor drive system. To implement the drive system, a digital signal processor, TMS 320LF2808, is used as a control centre to execute the control algorithms. Experimental results can validate the correctness and feasibility of the proposed methods.

Keywords

• permanent magnet motors
• machine windings
• invertors
• machine control
• electric current control
• power factor
• predictive control
• synchronous motor drives
• angular velocity control
• power capacitors
• digital signal processing chips
• electric machine analysis computing
• control engineering computing
• torque control
• power conversion harmonics
• damping compensation method
• input power factor
• input current harmonics
• current-loop predictive controller
• speed-loop predictive controller
• control centre
• control algorithms
• high-power-factor interior permanent magnet synchronous motor drive system
• film dc-link capacitor inverter
• control methods
• positive torque region current control
• torque dynamics