Design of an RLC Compensator for a Synchronous Motor: Torque Ripple Improvement

Abstract

AC-drive systems based Permanent Magnet Synchronous Motor (PMSM) are widely utilized in industrial applications due to many advantages including excellent efficiency, best reliability, and low-effective cost compared with DC-drive systems. Design and implementation of an RLC compensator for a PMSM-drive system is demonstrated in this paper. The main aims of using an RLC compensator are decreasing of Total-Harmonics-Distortion (THD) of the input line current and Ripple Factor (RF) of the electromagnetic torque over a wide range variation in rotor speed and load. The entire transfer function of the proposed system is derived for stability verification under the change of rotor speeds. The proposed PMSM-drive system is implemented with and without RLC compensator for two cases; which are at a fixed load and a step-change in load. Good performance is achieved using the proposed RLC compensator; in terms of THD and RF are 0.77% and 3.13%, respectively.

High-resolution rotor-position detection for green vehicle drives at halt condition with statistical view

“…Gradually, environmentally-friendly electric cars, based on permanent magnet synchronous machines (PMSM), have proceeded to substitute vehicle engines which considered as a source of such pollution [1][2][3]. PMSMs have an essential role in the wide range of green industrial applications, due to their promising features such as low consumption of fuel, significant reduction in carbon dioxide (CO2) emissions, more reliable, better power-to-size ratio and more rapid speed reaction [4][5][6][7][8][9]. However, some drawbacks are also companying the use of PMSM such as it cannot be directly derived from the alternating voltage source.…”