A monitoring method for power condition of AC motors via graphic recognition

作者：Gu Lichen^*; Liu Peijin

来源：Proceedings of the CSEE, 2012, 32(9): 100-108.

• Active power
• Apparent power
• Driving systems
• Figure recognition
• Functional relationship
• Graphic recognition
• Lissajous
• Lissajous figures
• Mathematical analysis
• Monitoring methods
• Motor driving system
• Motor power
• On-line recognition
• Phase sequence
• Power conditions
• Power drives
• Power matching
• Power Optimization
• Power-circle
• Running conditions
• Swing angle
• Three-phase currents

In order to realize on-line recognition and power optimization control of the AC motor driving system, amplitude, phase, and phase sequence of three phase current and voltage were synthesized into Lissajous figure by Lissajous method. Functional relationships between motor power and the graphic features (including Lissajous figure area, boundary rectangle, swing angle) were deduced by mathematical analysis. The power circle graph which can express motor power various state was obtained by calculating graphic feature quantities of Lissajous figure. Figure recognition technology of motor power state and running condition of driving system was realized. The experimental results show that, Lissajous figure and power circle graph can on-line illustrate power matching procedure of load and motor, and dynamic procedure of motor active power, reactive power, and apparent power. From Lissajous figure swing angle, the typical running conditions recognition of AC motor, such as loading, unloading, impacting, overloading protection, and power drive and power generation can be accomplished.

• 出版日期2012