BRUSHLESS DC MOTOR

Biplab Nayak

Regd. No.- 0901321003

Branch-EEE, 7th semester

Bhubaneswar Institute of Technology

WHAT IS BRUSHLESS DC MOTOR ?

Brushless DC motors are synchronous motors which are powered by a DC electric source via an integrated inverter, which produces an AC electric signal to drive the motor.

HISTORY OF BRUSHLESS DC MOTOR British scientist Michael Faraday first

experimented with the idea of the electromagnetic induction motor in the early 1800’s.

During that time, DC Motors did not contain permanent magnets. Instead, they operated similar to Brush DC Motors today, in that they had current flowing through the windings of the motor. In 1837 Americans Thomas and Emily Davenport transformed Faraday’s DC Motor into one that could be used for commercial use. These DC Motors became popular in printing presses and powered machine tools.

EQUIVALENT BLOCK DIAGRAM OF BRUSHLESS DC MOTOR

K

G

A

K

G

A

K

G

A

K

G

A

K

G

A

K

G

A

DC

SUPPLY

+

-

TRIGGERCIRCUIT

SHAFT-POSITIONSENSING SYSTEM

+

-

DCFIELD

EQUIVALENT BLOCK DIAGRAM OF BRUSHLESS DC MOTORTo remove this watermark, please purchase SmartDrawat www.smartdraw.com or call 1-800-768-3729

ADVANTAGES OF BRUSHLESS DC MOTOR

No maintenance.

Much longer operating life.

No risk of explosion or possibility of RF radiation due to arcing, higher efficiency, rapid response etc.

DISASSEMBLED VIEW OF BRUSHLESS DC MOTOR

CONSTRUCTION OF BRUSHLESS DC MOTOR

Brushless motors can be constructed in several different physical configurations.

 In the 'conventional' configuration, the permanent magnets are part of the rotor.

COMPARISON OF CONVENTIONAL AND BRUSHLESS DC MOTOR

BRUSHLESS DC MOTOR MAY BE CONTROLLED BY

Voltage-Fed Inverter

Current-Fed Inverter

BLOCK DIAGRAM OF VOLTAGE-FED CONTROL

BLOCK DIAGRAM OF CURRENT-FED CONTROL

IF THE BRUSHLESS DC MOTOR RUNS IN IMPROPER WAY OR STOPS RUNNING, THEN HOW CAN THIS PROBLEM BE SOLVED?

BRUSHLESS DC MOTORS

APPLICATIONS OF BRUSHLESS DC MOTOR

Instrumentation

Medical

Appliances

Automotive

Factory Automation Equipment

Aerospace

Military

CONCLUSION Although Brushless DC Motors are more

expensive of the same kW rating than conventional DC Motor but there are many advantages.

Brushless DC Motors can run when submerged in fluids.

Brushless DC Motor does not produce brush or commutator particles or gases as by-products of operation.

REFERENCE

J.B. Gupta 2011. Theory & Performance of Electrical Machines. 14th Ed. Katson Books

Dr. P.S. Bimbhra 2011. Power Electronics. 4th Ed. Khanna Publishers

http://www.anaheimautomation.com

THANK YOU