Design of Robust Controller and Force Observer for PM Linear Synchronous Motors

The advantages of permanent magnet linear synchronous motors （PMLSM） include high speed and good motion precision compared with rotary motors. However, PMLSM are sensitive to uncertainties such as the parameter perturbations and end effect etc. A new nonlinear robust scheme of PMLSM is proposed to overcome this trouble. First, a quasi-linearized and deeoupled model with uncertainties is derived from the mathematical model of PMLSM by using the conception of feedback linearization. Then a fixed-boundary-layer sliding mode controller using the m sat function is designed to guarantee the robustness. Design of a force observer is given to estimate the load force unknown in the new model. Finally, the validity of the proposed strategy compared with the conventional PID control scheme is proved by the DSpobased experimental results.

ZephyrosZ72风力机的设计

ZephyrosZ72是无齿轮的变转速风力机，具有直接驱动的PM同步发电机，风轮直径为70m。文章介绍了设计过程、试验和样机，重点是发电机，它是到目前为止风力机市场上最大可用的PM发电机。 试验和交付使用后的风力机有超过8000电网连接小时的记录，及多于4700MWh的产出。评述了试验和运行经验，并给出了结果。进行了诸如功率曲线（功率相对于平均风速的关系）、噪声和热运转（heatmn）的测量，显示了良好的结果，并重新结合到设计计算中。 风力机已在2002年4月安装，并完成了设计评估鉴定和测量。