BLDC MOTOR

Brushless DC motor

INDEX

Presented by Manzano, Turelli and Pallotta

INDEX

What's a BLDC?

Working principles

How to control the direction

Hall effect sensor

Speed control

01

WHAT'S A BLDC?

BRUSHLESS DC MOTOR

A brushless DC motor (BLDC) is an electric motor that uses permanent magnets on the rotor and electromagnetic coils on the stator to generate rotational motion.

What's a BLDC

What's a BLDC

pros and cons:

BLDC+ Higher efficiency + Less noise + Reliable - Expensive - Complicated control

BDC+ Cheap + Simple control - Mechanical noise - Less reliable - Sparks

02

WORKING PRINCIPLES

BRUSHLESS DC MOTOR

STATORMade by coils that generate a rotating magnetic field.

Working principles

ROTORIt's a permanent magnet that rotates following the rotating magnetic field.

HOW DOES IT WORK?

Working principles

Working principles

"Happy state"

Working principles

Working principles

Undefined sense of rotation by reversing the current

03

HOW TO CONTROL THE DIRECTION

BRUSHLESS DC MOTOR

By adding 2 more set of coils to the stator with 120 degrees between them.

Working principles

PROCESS OF COMMUTATING

This process consists in taking the current out from one coil and putting it in another coil.

How to control the direction

HOW TO CONTROL THE DIRECTION?

This process isn't efficient in terms of torque because it energize one coil at a time.

To increase the torque we need to energize two coils at a time.

04

HALL EFFECT SENSOR

BRUSHLESS DC MOTOR

A Hall effect sensor is a transducer that detects changes in magnetic field and creat a voltage as the output

05

HOW TO CONTROL THE SPEED

BRUSHLESS DC MOTOR

SPEED

+ SPEED

- SPEED

THANK YOU!