BALANCING ECCENRTIC ROTOR OF SYNCHRONOUS MOTOR

The relevance of the study is due to the widespread use of turbomechanisms (pumps, fans, compressors) in various industries. For electric drives of these mechanisms, the urgent task is to increase the speed of rotation of the motors. This task is associated with an increase in the productivity of turbomechanisms, which affects the increase in the volume of production of products. However, commercially available AC electric motors at network frequency of 50 Hz have rotational speeds of no more than 3000 rpm. In order to obtain twice the rotation speed, a synchronous motor with a six-phase stator winding and a jet rotor was designed. When powered by a general industrial three-phase network of 50 Hz, it has a rotational speed of 6000 rpm. However, due to the eccentric design of the rotor, the motor shaft has significant beats caused by the pendulum moment. These runouts can lead to the destruction of the bearing and premature failure of the synchronous motor. The purpose of the study is to analyze the ways of balancing the eccentric rotor of a high-speed synchronous motor. Materials and methods. Analytical methods of theoretical mechanics and the theory of electromechanical energy conversion were used in the work. The mechanical calculation was performed using the Compass 3D program. The main results of the study are a picture of the moments arising from the eccentricity of the rotor, and the analysis of ways to compensate for the moment of imbalance of the rotor. It is established that the dependence of the moment of imbalance on the angle of rotation of the rotor is a harmonic function. Therefore, in order to compensate for the imbalance, it is necessary to create a moment that varies in antiphase to the moment of imbalance of the rotor. It is shown that the most rational ways to compensate for rotor runouts are balancing with eccentrics and compensation with an additional electromagnetic moment created with the help of a magnetic field. Based on the comparative analysis of the effectiveness of these methods, their advantages and disadvantages are shown. The principle of compensating for the moment of imbalance of the rotor with the help of an additional electromagnetic moment created by the stator winding is considered. Findings. The effectiveness and expediency of balancing the rotor by means of exposure to a magnetic field are shown.