Asynchronous Motor Efficiency On-Line Detection And Efficiency Optimization Technology Study

Motor is widely used in industrial ,agricultural and any other fields as an important drive equipment,and occupies important position.In China,about two thirds of power is consumed by the motors on various devices,and three quarters of these motors are induction motors.With the development of power electronic techniques,operating efficiency of motor can be improved by a variety of ways.As a major method in them,energy-saving control can greatly improved the motor efficiency.Therefore,the research on efficiency testing and efficiency optimization of induction motor have an important practical significance.In this paper, the stator surface and core of the alveolar can produce harmonic in Air-gap magnetic field, directly testing and analysis on the stator current, and detect the rotor which is proportional the tooth harmonic frequency in order to achieve the purpose of speed identification. It can get the key parameters which is used to detect rotor speed, shaft torque and so the efficiency of computing. Then the paper shows the various parts of the asynchronous motor loss and analyzes the feasibility of various loss which can reduce. And deeply study the optimization problem when the induction motor in light load and steady state. After the Clarke and Park vector coordinate transform, using golden-point method to control the optimal efficiency of induction motor, by changing the motor excitation current and torque current, through reducing controllable losses of the system, it can improve the efficiency of the motor.On the basis of hardware, the motor efficiency line detection and vector control efficiency optimization system based on TMS320F2812 is completed. Some hardware circuits such as power supply, current and voltage measuring, intelligent power module IMP and system procedure flow chart are given. Some key subprograms are introduced in detail and a great deal of experiment results are getted. The results indicate induction motor of vector control has heavy energy-conserving space while it operates in light load and verify the correctness of the theoretical analysis.