With the recent development of motor control technology, the maximum operating speed of the motor has increased, and accordingly, it is possible to remove the accelerator transmission in a system requiring high speed operation. As a result, the system has been made lighter and smaller, and the energy conversion efficiency of the system has also been increased. High speed motors are used in many industrial fields such as high-speed machine tools, turbo molecular pumps, micro gas turbines, turbo compressors, and high-speed centrifugal separators. The application field of the existing high-speed motor has been mainly used in special industrial fields, and has been developed focusing on small varieties and small production.
When the motor is driven using the SVPWM control method, losses and torque ripple are increased due to harmonic components included in the current. So, this dissertation deals with the electromagnetic design and dynamic characteristics analysis considering SVPWM of a high-speed permanent magnet synchronous motor for centrifugal pump.
Based on the electromagnetic theory, the electromagnetic characteristic equation and performance analysis of a high-speed permanent magnet motor were performed based on an analytical method. Through this, analysis results such as magnetic flux density distribution, flux linkage, electromotive force, inductance, and electromagnetic force could be derived. Basic electromagnetic design was performed, and detailed design of a motor that satisfies the requirements and constraints was performed using a finite element analysis program. In addition, stability during high-speed rotation was confirmed through stress analysis and risk analysis of the designed rotor, and structural stability was confirmed by confirming the resonant frequency through the mode analysis of the stator.
The motor and the SVPWM inverter were modeled, and the environment for the co-simulation analysis of the controller and the motor was established. The designed motor was manufactured and the motor performance was evaluated. Based on the results presented in this dissertation, it is judged that it will be able to contribute to the related industries by designing, developing and evaluating the performance of a motor that can be used for industrial 12,500rpm, 100 horsepower class centrifugal pumps. In addition, the design process and the co-simulation analysis method used in this dissertation are considered to be useful in the design of high-speed motors that can be applied to various industrial applications.