间接矢量控制系统中磁场电流的优化选择

Optimal Field Current Selection in the Indirect Vector Control System

对感应电机弱磁过程中磁场电流的选择进行了优化,同时考虑高速区铁耗的影响,对其进行线性化补偿。磁场电流大小的选择在间接矢量控制系统中具有非常重要的意义,尤其在弱磁过程中,磁场电流的不合理选择会降低电流的利用率,使系统输出转矩减小,带载能力减弱,在弱磁区的恒功率运行范围缩短,对升速的快速性也有影响。根据电流、电压利用最大化的原则,对磁场电流进行优化选择,同时,对铁耗在高速区的影响进行了分析,并且提出了线性化的补偿方法。最后,通过基于DSP的全数字主轴驱动器进行了物理试验,试验证明磁场电流的优化和对铁耗的补偿是可行的,而且对主轴驱动系统性能的提高是非常显著的。

An optimization for field current existing in field-weakening control was made, meanwhile taking the effect exerted by iron losses a linearized compensation for it was made, too. The selection of field current is very important for indirect vector control especially in the field-weakening region. Unreasonable selection can- not gain the greatest torque which in turn yields effect on on-load capability, hence to shorten the constant-pow- er interval and to have an influence on rapidity of raising speed. An optimization for field current was made ac- cording to the principle of maximized utilization of current and voltage,meanwhile an analysis of effect exerted by iron losses in high-speed interval on which linearized compensation method was proposed. The experiment results show the optimization for magnetic-field current and the compensation for iron losses are feasible, and which are necessary for high-performance spindle control.