Signal-Injection-Based Efficient Direct-Determination of Controller Gains and Nonlinear Friction Compensation Values in SPMSM Drives

This letter proposes an efficient direct-determination method for controller gains and nonlinear friction compensation values of surface-mounted permanent magnet synchronous motor (SPMSM) drive systems, enabling fast deployment and reliable control. Firstly, by leveraging open-loop speed response characteristics of the high-speed region resulting from sequential signal injection, the inertia-to-flux ratio (i.e., the quotient of total inertia to rotor flux linkage) is directly obtained for gain tuning. Secondly, with aiding from an equivalent nonlinear friction model, friction compensation values are directly extracted from the natural-decay speed response data triggered by zero-value signal injection. Departing from conventional approaches, the proposed method circumvents the need for complex model identification and cumbersome procedures, as well as for laborious internal parameter design. Experiments conducted on a 1.2-kW SPMSM drive system confirm the effectiveness of the proposed method.