4 April 2019

Comparison Between BLDC Motor And Conventional DC Motor

The Comparison between BLDC Motor and Conventional DC Motor is summarized as below.

Features
Conventional DC Motor

BLDC Motor
Supply
Single Phase
It is available in Single Phase, Two Phase or Three Phase. The Three phase BLDC is popular famous in the industries.

Construction
Stator – Permanent magnet
Rotor – Winding

Stator – Winding
Rotor – Permanent Magnet
Inertia of rotor
More

Less
Speed range
Low due to presence of brushes
Higher range of speed due to absence of brushes and commutator

Commutation
Brush commutation
Electronic commutation from position of Hall Sensor

Torque / Speed Characteristic

Moderately flat
Flat
Efficiency
Moderate

High
Electromagnetic interference ( EMI ) generation
EMI generates in the nearby equipments due to sparking in the brushes

Low EMI generate
Cost
Less
High cost due to permanent magnet rotor and electromagnetic commutation

Control
Complicated and costly

 -
Speed control
Controller is necessary for variable speed control

Controller is necessary in order to run BLDC motor
Position of rotor
Automatic by brush position

Through hall sensor or optical sensor
Direction of rotor
Either by changing field winding connection or armature winding connection

Depends upon logic sequence
Maintenance
Requires continuously
Less maintenance due to absence of brushes and commutator

Heat dissipation
Heat dissipates in the air gap as the armature lies on the rotor
As the winding embedded in the stator, heat dissipation is better as compared to DC Motor.


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