Perfect field oriented brushless DC motor

The field oriented controlled brushless DC (BLDC) motor resembles the dynamic characteristics of a fully compensated DC motor. The torque developed from such drives is directly proportional to the armature current and hence a super dynamic performance is achieved. This paper presents a new and simple technique of field orientation in BLDC motor drives. This technique relies upon adding an extra control loop to the ordinary voltage source inverter fed BLDC drives and allows the drive to develop maximum torque per ampere at any loading condition. The implementation of this control loop is quite simple and does not complicate the overall drive circuitry.