基于载波电流的无轴承电机无位移传感器研究

Performances of bearingless and sensorless motor drive based on carrier injection

针对位移传感器的使用限制了悬浮传动系统微型化的发展,提出一种无需位移传感器的转子位移估算方案.高频载波电压加在电机电枢绕组上,载波电流随转子位置的变化而改变,通过对载波地电流信号的检测,确定转子位置.整个系统不需位置传感器,有效缩短电机的轴向长度,降低成本.分析了载波电流对电机运行的影响,综合各方面的影响,选取载波频率,并建立转子位置的数学模型.结果表明:基于载波电流的转子位置无传感测量能够有效检测转子位置.

A self-sensing non-bearing motor is considered as an effective solution to reduce cost and shorten a shaft length.A novel estimation method of a rotor displacement is proposed.Based on the detection of currents induced by mutual inductances,a high-frequency carrier voltage is superimposed on a motor main terminal voltage.The induced carrier-frequency current component is distinguished from the suspension-winding current.The carrier signal is selected.It is shown that a successful magnetic suspension is realized with the proposed method.