Reduction of cogging torque of radial flux permanent magnet brushless DC motor by magnet shifting technique

• Дата: 2022
• Автори: Panchal, T. H., Patel, A. N., Patel, R. M.
• Формат: Стаття
• Мова: English
• Опубліковано: National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” 2022
• Теми: крутний момент зубчатої передачі; аналіз методом скінчених елементів; зсув магніту; безщітковий двигун постійного струму з постійними магнітами; cogging torque; finite element analysis; magnet shifting; permanent magnet brushless DC motor
• Онлайн доступ: http://eie.khpi.edu.ua/article/view/251932
• Назва журналу: Electrical Engineering & Electromechanics

  Introduction. In spite of many advantages of radial flux permanent magnet brushless DC motors it suffers from the distinct disadvantage of high cogging torque. The designer must emphasize to reduce the cogging torque during the design stage. This paper introduces magnet shifting technique to mitigate cogging torque of surface mounted radial flux brushless DC motor. Methodology. Initially 200 W, 1000 rpm surface mounted radial flux permanent magnet brushless DC motor is designed with symmetrical placement of permanent magnets with respect to each other on rotor core. Cogging torque profile of this initial motor is obtained by performing finite element modelling and analysis. Originality. This design has been improved by shifting the position of permanent magnets with respect to adjacent permanent magnets. The effect of magnet shifting on cogging torque has been analyzed by performing finite element analysis. Results. It has been examined that the peak to peak cogging torque is decreased from 1.1 N×m to 0.6 N×m with shifting of permanent magnets respectively.