无轴承永磁同步电机控制系统存在由多因素引起的转矩脉动，且空载或轻载运行时电流跟踪性能差。基于旋转编码器，给出转子位置角可靠检测方法及转速优化计算公式。通过分析永磁同步电机数学模型，同时考虑无轴承电机负载效应，提出增磁控制与电压调节相结合对电机转速进行控制的策略，并给出其优化实现方法。实验结果表明，采用该控制策略，无轴承永磁同步电机的电机绕组电流脉动程度得到减弱，转速稳定性好、控制精度高，同时可改善其悬浮性能，是一种简捷、有效的无轴承永磁同步电机转速控制策略。

The bearingless permanent magnet synchronous motor (BPMSM) has torque ripples induced by multiple factors, and the current tracking performance is bad as it runs with no load or light load. Based on the use of rotary encoder, the method of reliably detecting rotor position and the optimal speed calculation formula are given. With the analysis of PMSM mathematics model and the consideration of load effect in bearingless motor, a strategy of controlling BPMSM speed by means of combining flux enhancing control with voltage regulation is proposed, and its optimal realization method is also given. The experiment results indicate that, after adopting the strategy, the motor windings current ripples in BPMSM are weaken, the speed is stable with high control accuracy, and the suspending performance can also be improved. The strategy is simple and effective for BPMSM speed control.

国家863高技术基金项目(2007AA04Z213)。