Electric motors are a key component in many mechatronic systems to provide necessary driving forces. They are employed in households, industry, transportation, national defense and medical care. There are various types of electric motors, such as induction, DC, permanent magnet and reluctance motors. The development of permanent magnet motors has become increasingly demanding thanks to the well development of electronics technology, magnetic materials and manufacturing capacity. This course focuses on permanent magnet brushless motors, for which the fundamental principles, magnetic circuit analysis and windings design will be explicated systematically. Students will learn the fundamental knowledge in design of such an electric motor.