Research on the low speed performance of speed sensor-less vector control system

Compared with speed sensor vector control, traditional speed sensor-less vector control has many advantages, such as lower cost, higher reliability. But it also has many shortcomings at low speed, such as a lowly accurate speed, weak load capability. The above shortcomings partly block the large-scale application of speed sensor-less vector control. The fundamental reason is that most of traditional flux observation methods depend on the voltage model and EMF. In this paper, the traditional arithmetic of speed sensor-less vector control is improved. It abandons the voltage model to improve low speed performance, so it can be used in different working conditions.