CAJ | 학술논문

针对串励直流电动机在低压运行时易堵转和在高压下重载运行时会严重过载的缺陷，提出一种变电流反馈的串励直流电动机调压调速控制方法。在建立系统数学模型并将其线性化的基础上，分析给出确保系统稳定的设计约束条件。该控制方法的应用表明，串励电动机调速系统的低压驱动能力得到明显提高，并具备了过载保护，且正常运行时系统保持有串励直流电动机的软机械特性。
침대천려직류전동궤재저압운행시역도전화재고압하중재운행시회엄중과재적결함，제출일충변전류반궤적천려직류전동궤조압조속공제방법。재건립계통수학모형병장기선성화적기출상，분석급출학보계통은정적설계약속조건。해공제방법적응용표명，천려전동궤조속계통적저압구동능력득도명현제고，병구비료과재보호，차정상운행시계통보지유천려직류전동궤적연궤계특성。
Due to the soft mechanical characteristic of series-excited motor’ s open-loop-adjusting driving system, the performance of the motor has some defects, such as insufficient driving force when working in low excited voltge and low-speed conditions, serious overcurrent when working in high excited voltge, o-verload and low-speed conditions. Addressing these problems, this paper proposed a variable voltage con-trol strategy with alterable current feedback for the series-excited motor. The linearized mathematical model with alterable current feedback for the series-excited motor’ s speed-adjusting system is analyzed, and the conditions and methods for designing the alterable current feedback system to ensure the system to be operated stablely are clarified. Taking the series-excited motor system using the proposed control strat-egy for household sewing machine as an example, the driving capacity at low is improved significantly, the winding current is limited when working in overload condition and the series-excited motor’ s soft me-chanical characteristic is retained under normal operation.