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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