Comparison between BLDC versus Induction motor

aarohi manager Jul 14, 2021 BLDC Motor Efficiency versus induction motor 0 Comment

In today’s technological era without an electric motor, we can never utilize electrical energy efficiently. The motor is a very important part of the electrical field. electrical motors are used in different industries for various equipment control and applications. Design engineers have many choices of electric motors are available in the market while designing applications.

There are mainly two basic types of electric motors: AC motors and DC Motors. The table below shows the difference between a BLDC versus an induction motor.

Comparison between BLDC versus Induction motor

Sr. No	Particular	BLDC Motor	AC induction Motor
1	Speed/torque Characteristic	The speed/ torque characteristic is flat in nature. it enables operations at all speeds with rated load	The speed/torque characteristic is non linear in nature. It enables lower torque at lower speeds.
2	Rotor Magnet	BLDC motor replaces the windings on the rotor with a series of permanent magnets	Induction Motor rotor does not have any magnets
3	Output Power/frame	Higher	Output power frame size is moderate. because both stator and rotor have winding , output power to power frame size is lower than BLDC.
4	Rotor Inertia	The rotor inertia is lower. It enables dynamics characteristic	The rotor inertia is higher. This enables poor dynamics characteristics
5	Starting current	The starting current is rated. it does not require special starter circuit.	The starting current is approximately up to 7 times of rated therfore stator circuit should be carefully selected. it normally uses star delta starter.
6	Controller	A Controller always required to keep the motor running. it will also used for the variable speed control of motor	No controller is required for fixed speed operation. the controller is required only for variable speed desired.
7	Slip	No Slip is experienced between stator and rotor frequencies	The rotor runs at lower frequency than the stator by slip frequency with load in the motor.
8	Efficiency	Higher efficiency	Lower compared to BLDC
9	Cost of motor	Higher due to permanent magnet	Lower Compared to BLDC
10	Size	The BLDC motor is smaller in size	Bigger in size compared to BLDC
11	Application	BLDC Motor can be used in Computer hard drives,DVD/CD players, Electric vehicles, hybrid vehicles, electric bicycles. Industrial robots, CNC machine tools, Washing machines, compressors and dryers, and simple belt driven systems etc.	AC induction motor can be used in Lifts,Cranes, Hoists, Large capacity exhaust fans, Driving lathe machines and Crushers etc.