The high-frequency signal injection for sensorless method for determining the angular rotor rotor of the synchronous motors

Konstantin Litsin, Sergey Baskov

Abstract


The method of sensorless control the angular position of the rotor synchronous motors was viewed in this paper. The pros and cons of the use of such systems to replace systems using rotor position sensor were presented. The advantages of sensorless motor control systems: improve the reliability of the electric system, reduce the cost of the drive, improve the weight and size. Application field of sensorless drives was given. The analysis of possible ways to control the angular size of rotor was made. Advantages and disadvantages were presented. There are a number of methods of sensorless determination of the angular position of the rotor, but each of them has one significant drawback according to which the angular position of the rotor cannot be determined at low and zero motor speeds. The high-frequency injection, allowing the expense of imposing an additional signal to eliminate the identified problem was considered. The main idea of this method is to initiated a voltage or current, which contain information about the position of the rotor, by high frequency injection. he main advantage of this approach is that it allows to evaluate the position of the rotor at zero and low speed, it was not possible in earlier approaches. A mathematical model of the heterodyning for acquiring the specialized frequency content of the signal was introduced. 


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References


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DOI: http://dx.doi.org/10.24892/RIJIE/20130104

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