Induction motor inverter power supply of the energy saving control technology research

As the fan and pump load speed regulation and energy saving as well as the development of production technology, the induction motor variable frequency speed regulation also made certain progress, induction motor variable frequency control method is widely used in projects. This paper mainly on the development of induction motor energy saving control technology are analyzed, and the status quo of the application of induction motor speed controller design and energy saving operation control are discussed in this paper and the research, in order to solve the problem of induction motor light load inefficient operation.

At present, the power of reasonable utilization rate is low, especially used in motor, drive technology of poorly that electrical energy consumption is too high in our country, to relieve the tense and pollution control of our energy is very bad, this problem has caused the attention of domestic academe and engineering, the study of induction motor energy conservation has its important practical significance and application of induction motor energy-saving control technology, also has its necessity.

1 induction motor energy saving control technology development and application status of 1) the current status of application of the induction motor speed control technology.

Induction motor speed control technology is mainly divided into meet the general performance of the scalar control and meet the high dynamic performance of vector control and torque control. Scalar control, including the slip frequency control and constant voltage and frequency control two kinds of schemes, the latter is the variable frequency speed regulation technology is simple and practical, this way of scalar control don't have to rely on too much of the motor parameters, control algorithm is simpler, the controller hardware is not too high requirements, but because of the dynamic and static performance is poor, is only applicable to general performance of speed adjustment, and high dynamic performance of servo system such as nc machine tools, electric locomotive is depends on the vector control technology, the vector control technology based on direct torque control and vector transform from complex calculations, easier to realize digital. In recent years, with the continuous development of vector control technology, and has no speed sensor control, intelligent control of the motor, such as technology, application of these techniques in gradually blend together.

2) the development trend of induction motor energy saving control operation.

In the backdrop of the global energy shortage highlight, the study of induction motor energy conservation has important social and economic benefits, induction motor in the actual operation often is in light load condition, in view of the current mature control methods of focusing on dynamic method is simple and motor speed control features and ignore the energy saving problem, the running efficiency of induction motor is low. With the expanding the scope of application of variable frequency device, optimize system efficiency becomes more and more important, it also became the important subject of attention. At present, the further research of the energy saving control of induction motor running still exist many problems to be solved, such as improve the efficiency of light load frequency control of motor speed system steady, leads to a dynamic torque response; The motor load torque is hard to measure online, in most cases still need to rely on artificial to complete, and so on, can see from the existing problem, induction motor energy saving control technology in the future development will inevitably into the present three trends: search control model with the minimum loss control joint, the development of energy-saving control technology related to the engineering practice, and the comprehensive application of various kinds of efficiency optimization method.

2 speed controller design and control of induction motor energy saving operation 1) speed controller design.

Improve and optimize the speed controller, better able to solve the actual problems in the energy saving control, speed controller can be designed from the following three aspects.

One is to improve the classic speed regulator, the proportion of classic speed regulator link although has the regulating rapidity, even so, it has defects of static speed deviation, although can through effective in integrating static speed deviation will solve this problem, but the resulting control lag defects are becoming the new problems, to achieve at the same time to eliminate static speed deviation and adjust the quickness of, must be on the improvement, improvement measures are as follows: when the motor control system for a wide range of speed regulation, people can take proportion link adjust way of speed governor of transition process speeds up, and then make the speed deviation problem solved; When the motor control system for small scale speed or speed control system interference, PI adjustment, can be used to effectively solve the problem of rotation speed deviation, meanwhile, make speed control precision is higher.