Brushless DC Motor Control System

1. Introduction

Electric motor drive is an electromechanical contrivance that takes electrical energy from the supply and then transforms it into mechanical-energy by the avail of a motor to achieve a desired output. Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to engender force. There are many types of DC motor drive and they differ from each other in terms of their utilization. Among the variants of DC motor drives, the Brushless DC motor drive and its fundamental control system will be the one that will be discussed in this library assignment.

1. Aim

In this library assignment, we will be discussing about the Brushless DC motor drive and its rudimental control system by providing

Most BLDC motors have three stator windings connected in a star configuration. Each of these windings is constructed with numerous coils interconnected to compose a winding.

There are two types of stator windings variables: trapezoidal and sinusoidal motors. This differentiation is made on the substratum of the interconnection of coils of the stator windings to give the variants of back Electromotive Force (EMF). The trapezoidal motor gives a back EMF in trapezoidal fashion and the sinusoidal motor’s back EMF is sinusoidal

Rotor

The rotor (moving part) of a BLCD consists of a permanent magnet (equipollent to a bar magnet) is magnetized by the energized stator phase. By utilizing the opportune sequence to supply the stator phases, a rotating field of the stator is engendered and maintained. This action of the rotor - chasing after the electromagnet poles on the stator - is the fundamental action utilized in synchronous permanent magnet motors. The lead between the rotor and the rotating field must be controlled to engender torque and this synchronization implies knowledge of the rotor

Current trends of the BLDC motor drive

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1. Future trends of the BLDC motor drive

Many Asian countries such as Japan, which has been under pressure from high energy prices, have implemented the variable speed PM motor drives for energy preserving applications such as air conditioners and refrigerators since the past two decades].

On the other hand, the US has kept on utilizing frugal induction motor drives, which have around 10% lower efficiency than adjustable PM motor drives for energy preserving applications.

Therefore, recently, the pain of energy prices for customers has spurred higher ordinant dictations of variable speed PM motor drives. Additionally, the recent rapid proliferation of motor drives into the automobile industry, predicated on the hybrid synergy drives, engenders an earnest demand for high efficiency PM motor drives. Predicated on all these driving factors, sundry Sensorless drive schemes for BLDC motors will open the way for full perforation of the BLDC motor drive into sundry military and commercial