Influence of nonlinearity of servo system electrical characteristics on motion smoothness of precision CNC machine tools

Disturbance-Observer-Based Second-Order Sliding-Mode Position Control for Permanent-Magnet Synchronous Motors: A Continuous Twisting Algorithm-Based Approach

“…Energies 2024, 17,2974 where α = 3n p λ m /2J, β = B m /J, and γ = 1/J. Considering T f and T L as external disturbances, in addition to mechanical and electrical parametric variations, the rotor position dynamics of the SMPMSM servo system can be formulated as…”

“…The permanent-magnet synchronous motor (PMSM) has become a key technology in modern electromechanical systems, distinguished by its superior features compared to other AC motor counterparts, including its high efficiency, high power factor, and high torque density [1,2]. Although PM materials have a relatively high cost, the aforementioned advantages have led to the PMSM's widespread application in areas where cost sensitivity is not a primary concern, including electric and hybrid vehicles [3][4][5], wind energy conversion systems [6][7][8], energy storage systems [9][10][11], advanced robots [12][13][14], and high-precision machine tools [15][16][17]. Moreover, increasingly, more fields such as the high-speed electric multiple unit are exploring the use of PMSMs to replace the dominant AC motors in their respective domains [18][19][20].…”