SURVEY ON SPEED CONTROLLERS FOR A PERMANENT MAGNET BRUSHLESS DC MOTOR
The permanent magnet brushless DC motors are utilized more in automotive, industrial and household product due to its high torque density, compactness, high efficiency, low maintenance and simple control. BLDC motor is meant to utilize the trapezoidal back emf voltages with square wave currents to come up with constant torque. BLDC motor is electronically controlled and needs rotor position data for correct commutation of the currents even at fixed-speed application. On the other hand it's very
... important to lower the producing value of the BLDC motor drive for several applications. This survey presents analysis of many algorithms planned by many authors to deal with the speed control of BLDC motor effectively. The several algorithms are analyzed completely to spot their benefits and limitations. The performance analysis of the algorithms is applied to see the simplest approach. Finally the fuzzy and neural techniques are found to have superior quality for speed control of drives. INTRODUCTION The utilization of magnet in electrical machines have and benefits than magnetic force excitation machines which ends up in high efficiency, easy construction, low cost, less maintenance and high torque or high output power per unit volume. In early nineteenth century, magnet excitation system was used for first time in electrical machines. The performance of this machine wasn't satisfactory; owing to poor quality of exhausting magnetic material create this less usable. Once the invention of alloy rested the employment of magnet excitation system will increase. Lanthanoid permanent magnets improve the ability density and dynamic performance of the machine. Induction motors are preferred machine within the twentieth century due to its easy construction, less price, dependability and low maintenance. Because of little air gap, lower efficiency and low power issue than synchronous machine it create synchronous machine to be a part in industrial applications. The schematic arrangement of permanent magnet synchronous machine is shown in Figure-1. Due to high power to weight quantitative relation, high torque, smart dynamic control for variable speed applications, absence of brushes and electric switch create Brushless dc (BLDC) motor , most suitable option for prime performance applications. Also absence of brushes and electric switch, there's no drawback of mechanical wear of the moving elements [2-3]. As well, higher temperature reduction property and skill to control at high speeds [4-5] build them superior to the conventional dc machine. However, the BLDC motor constitutes a tougher drawback than its brushed counterpart in terms of modeling and system structure to its multi-input nature and paired nonlinear dynamics. Permanent-magnet brushless dc motors are additionally accepted which are utilized in superior applications. In several of those applications, the assembly of ripple-free force is of primary concern.