摘要:介绍了ABB-ACS800交流变频器DTC的原理和特点。计算和实例表明,转矩取决于转速差n1-n2,且与n1或f1有关;比较SPWM和SVPWM,指出ABB采用SVPWM:优化组合空间电压矢量,插入零电压矢量或反向电压矢量并调整其作用时间,生成按n1旋转的六边形或近乎圆形的磁链,获得给定转矩,实现调速。实例表明DTC具有快速响应和控制简洁的特点。同时具有广阔的发展前景,但仍有很多问题亟待解决。
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