Explanation:
Main principle of operation of brushless DC motor
Definition: A brushless DC motor (BLDC motor) is a type of electric motor that does not use brushes and slip rings. Instead, this motor operates using electronic controllers that control the position and speed of the motor.
Working principle: The main working principle of a brushless DC motor is that it has electronic controllers that flow electric current in the stator windings at the right time. These controllers receive feedback from Hall sensors or other types of sensors that measure the position of the motor. Based on this feedback, the controllers control the position and speed of the motor.
Analysis of the correct option:
The correct option is:
Option 4: Feedback from Hall sensors or encoders for accurate electronic commutation
This option correctly describes the main principle of operation of a brushless DC motor. In a brushless DC motor, Hall sensors or other types of sensors are used to measure the position and speed of the motor. This feedback is sent to electronic controllers that apply electric current at the right time to the stator windings, thereby controlling the position and speed of the motor.
Important Points
Analysis of other brushless DC motor options:
Option 1: Application of slip rings and carbon brushes for commutation
This option is incorrect because brushes and slip rings are not used in a brushless DC motor. Instead, electronic controllers are used that control the position and speed of the motor.
Option 2: Application of magnetic induction in the stator windings for rotation
This option is partially correct because there is application of magnetic induction in the stator windings, but it is not the main principle of operation of a brushless DC motor. The main principle is based on the feedback received from a Hall sensor or other type of sensor.
Option 3: Change the frequency of the power supplied to control the motor speed
This option is incorrect because in a brushless DC motor, the frequency of the power supplied is not changed to control the motor speed. Instead, electronic controllers are used that control the position and speed of the motor.
It is important to understand the working of a brushless DC motor and identify its main principle. This motor works by using electronic controllers, which control the position and speed of the motor based on the feedback received from a Hall sensor or other type of sensor. Thus, a brushless DC motor does not require brushes and slip rings, making it more reliable and efficient.
