... Chapter 12. Brushless DC MotorsTopics to cover:1. Structures and Drive Circuits2. Equivalent ... maintenance-freemotors were realised. These motors are now known as brushless dc motors.In this chapter, the basic structures, drive circuits, fundamental principles, steady statecharacteristics, ... sensors.Fig.1 Disassembled view of a brushless dc motor (from Ref.[1] p58 Fig.4.1)48531 EMS – Chapter 12. Brushless DC MotorsPage 12-10Laser printerIn a laser printer, a polygon mirror is...