Sine wave BLDC MotorSine wave BLDC MotorSine wave BLDC MotorSine wave BLDC MotorTorque and EMF EquationTorque and EMF Equation

Ideal case Practical casePractical case

Torque –speed Characteristics Ph DiPhasor DiagramCircle Diagram

SineSine--wave Brushless DC motorwave Brushless DC motor

BLDCM (Square wave BLDC motor)Rectangular distribution of magnet flux in

the air-gapRectangular current waveformsConcentrated stator windings

PMSM (Si BLDCM)PMSM (Sine wave BLDCM)Sinusoidal or quasi-sinusoidal

distribution of magnet flux in the air-gapSi id l i i id l tSinusoidal or quasi-sinusoidal currentwaveformsQuasi-sinusoidal distribution of statorconductorsconductors

2/25/2013 2K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

Distribution of magnetic flux in the air gap

2/25/2013 3K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 4K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 5K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 6K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 7K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 8K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

S h tS h tSynchronous reactance Synchronous reactance (X(Xss))

2/25/2013 9K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 10K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 11K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 12K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 13K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 14K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 15K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

Phasor Analysis Of Surface Magnet Sine Wave BLDC Motor

2/25/2013 16K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 17K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 18K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 19K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 20K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 21K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 22K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 23K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University

2/25/2013 K. Subramanian ; Power Electronics Division, School of Electrical Engineering, VIT University 24