جستجوی مقالات مرتبط با کلیدواژه « موتورهای مغناطیس دائم شار محور » در نشریات گروه « برق »

Multi-phase motors are increasingly used in electrical systems due to their benefits such as decreased current without decreasing voltage, decrease of DC link current and improved reliability. Major applications of such motors are naval systems, electric vehicles, spacecrafts and etc. besides, permanent magnet motors has gained researchers’ attention due to their simple design, high efficiency and power density, low volume and weight and minimum loss and noise.However, electrical motors companies are under pressure and they have to present devices with minimum financial charges. The first and the most important aspect in electrical machines design is to decrease the volume and weight and consequently improve their power density and efficiency. In other word, improvement is done by optimizing machines’ dimensions.This thesis presents design optimization of five-phase permanent magnet synchronous motors to use in underwater vehicles. For this purpose, motor is optimized using optimization Bees algorithm (BA) to have less volume and weight and best operational characteristics. Then, motor is simulated using Ansoft Maxwell which is based on finite element analysis. This software gives required information about performance of the motor. Finite element analysis is an accurate and valid method which is used extensively in analyzing such problems.

Today, the permanent magnet motors are widely used in various industries especially military applications due to such characteristics as high efficiency, low weight and high energy density. Torque ripple is an inherent characteristic of this type of motors. Time and space harmonics produced by the motor drive and the motor structure itself give rise to torque ripples in these motors. Geometric structure of the magnets and stator slots lead to cogging torque (one of the causes of torque ripple) in these motors. This unwanted torque component causes noise, vibration and motor starting issues. It also creates bubbles in the application of these motors as the submarine's propulsion. It should be noted that bubbles could lead to submarine detection which is undesirable in military application. This paper provides analytical formulations and validation by threedimensional finite element analysis to reduce this unwanted torque. This is an important step in achieving the goals of the country's marine industries organization.