A Review of Novel Brushless Dc Motor and Different Methods of Control

This paper is about a novel sensorless control of a Brushless DC motor, which is proposed for implementation of IC for different modes. The economical applications o Brushless DC (BLDC) motors have a wide speed range. There are two known techniques or driving the BLDC. They are Pulse Width Modulation (PWM) technique with a constant DC voltage or Pulse Amplitude Modulation (PAM) with an adjustable DC link voltage. The PAM technique is preferred over the PWM technique while controlling at high speed because of decreasing the commutation delay and high frequency harmonic waves. The measurement of the rise time of the dc link current is taken instead of its peak current in order to achieve the smooth startup operation. The requirement of the Hall Effect position is eliminated by the use of sensor less control of BLDC motors. The fixed power supply for driving a BLDC motor is incorporated with photovoltaic (PV) arrays, fuel cell stacks and a battery. The Hybrid Distributed Generation System (HDGS) structure is divided into five switching periods that includes five duty ratios. This allows the regulation of PV, fuel cells and battery powers. Hence, a fixed electrical power is achieved for BLDC motor. The fixed power capability will let the motor to run at its nominal power.