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Abstruct-Slotless Permanent magnet Brushless DC Motor(S1oiless PM BLDC motor) with the characteristics of high speed and high power density has been more widely used in industrial and automatic machine, Generally, beeause the position sensor represents the important factor in PM BLDC motor drives, Slotless PM BLDC moter i s necessary that the three Hall-ICs evenly be distributed around the stator circumference in case of the 3 phase motor. The Hall-ICs are set up in lhis motor to detect the main flux from the rotor. So the output signal from Hall-ICs is used to drive a power transistor to conlrol the stator winding current. However, instead of using three Hall-ICs, though we used two Hall-ICs or one Hall-IC, we estimate information of the others phase in sequence through a revokving rotor. This paper compared the charactedstics and performance by using three, two Hall-ICs and one Hall-IC for the 3 phase PM BLDC whose six stator and two rotor designed.