关键词: 高速电机, 电流环稳定性, 低载波比, 离散化建模, 数字控制延迟补偿

Abstract: In the case of high fundamental frequency operation and low carrier ratio of high speed permanent magnet motors, the control delay can seriously affect the stability of the drive system and cause the current loop control instability. The mechanism of control delay generation was introduced, the current loop model considering the control delay was reconstructed, the influence of cross-coupling and time delay effects introduced by delay under low carrier ratio on the stability of the current loop was systematically analyzed, and a strategy for offline compensation of the control delay angle was proposed by calculating the delay time to be compensated for the stable operation of the motor at the rated speed. Based on a 1. 5 kW, 18 000 r / min experimental prototype, discretization modeling was used to each part of the vector control system of permanent magnet synchronous motor, and the simulation and experimental waveforms before and after the control delay compensation were fully compared and analyzed, which proved the effectiveness and feasibility of the strategy and achieved the goal of stable operation of the motor at the rated speed.