Electrical and Electronics Engineering Machines Quiz

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Questions and Answers

What is the major difference between a BLDC motor and a DC motor?

BLDC motor has a physical commutator, while a DC motor has an electronically commutated system
BLDC motor does not require torque, while a DC motor relies on torque for operation
BLDC motor does not have brushes, while a DC motor uses brushes for commutation (correct)
BLDC motor uses brushes for commutation, while a DC motor does not have brushes

What powers the permanent magnet of a BLDC motor?

Mechanical force through a physical commutator
Magnetic field generated by the motor's movement
Electrical current through an electronically commutated system (correct)
Frictional force from the motor's rotation

What is the function of a physical commutator in a DC motor?

Controls the speed of the motor
Regulates the temperature of the motor
Changes the motor phase at the appropriate times for torque production (correct)
Generates electrical current to power the motor

How does a BLDC motor differ from a synchronous generator?

<p>BLDC motor is electronically commutated, while a synchronous generator uses a physical commutator (C)</p> Signup and view all the answers

What characteristic does a BLDC motor share with a DC motor?

<p>Torque and speed performance (D)</p> Signup and view all the answers

Flashcards

BLDC motor commutation

BLDC motors use electronically controlled switches instead of physical brushes to change the direction of current in the windings, resulting in smoother operation and longer lifespan.

BLDC motor magnet power source

In a BLDC motor, the permanent magnet's magnetic field is created by an electrical current flowing through its windings. This current is controlled electronically, allowing for precise regulation of the motor's speed and torque.

DC motor commutator function

A physical commutator is a mechanical device that switches the direction of current in a DC motor's windings, ensuring continuous torque production. It consists of a set of copper segments that are connected to the windings and make contact with brushes.

BLDC vs. Synchronous generator

A BLDC motor uses electronic commutation, while a synchronous generator uses a physical commutator. This means that the BLDC motor has no moving parts for current direction change, resulting in higher efficiency and reduced wear.

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BLDC and DC motor similarity

Both DC motors and BLDC motors produce torque and achieve speed control through the interaction of magnetic fields. However, BLDC motors offer advantages like higher efficiency, longer lifespan, and quieter operation due to their electronic commutation.

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