Speed ripple and vibration reduction in unbalanced loaded permanent magnet synchronous motor

With the development of technology, the need for electrical energy has increased. Electric motors, which have a large share in electrical energy consumption, are therefore required to be highly efficient. Due to its advantages such as high torque, high power density, high acceleration, small volume, low noise and efficiency, the interest in Permanent Magnet Synchronous Motors (PMSM) is increasing rapidly. One of the most important disadvantages of PMSM is its high price, which is expected to decrease with the development of magnet and semiconductor technologies and the widespread use of these motors. One of the problems encountered during the operation of electric motors is the speed ripple and vibrations caused by eccentricity or unbalanced loads. This causes permanent damage to the motors, especially at high speeds. Detection and elimination of these ripple caused by different reasons is very important for a reliable study. In this study, unbalanced load conditions are analyzed in unbalanced loaded PMSM and speed fluctuations that occur in case of unbalanced load are tried to be reduced by the proposed Adaptive Harmonic Injection method. Field Oriented Control of PMSM has been simulated and the validity of the proposed method has been demonstrated by simulation studies for different load and speed conditions and successful results have been obtained.