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Are BLDC motors AC or DC?

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 Are BLDC Motors AC or DC | Brushless DC Motor Working, Difference Between Brushed and Brushless DC Motor, Advantages and Applications

Are BLDC motors AC or DC? Learn about brushless DC motor working, differences, advantages, and uses of BLDC, AC, and DC motors.

Are BLDC motors AC or DC?

A BLDC motor runs on DC voltage. We also find BLDC motors in Ceiling fans and washing machines that run on AC, but in that case, AC is first converted to DC by an SMPS or switch-mode Power Supply. 

Why BLDC Motor run exclusively on DC? 

The BLDC motor brain is called an 'Electronic commutator', which is nothing but an electronic switching circuit that only runs on DC voltage.  Nowadays, we find BLDC motors in Electric Vehicles that run on a DC battery pack. 

Difference between Brushed v/s Brushless DC Motor: 

A BLDC motor is very similar to the DC motor, but there are some basic differences in the construction. Let's understand that. 

Conventional brushed DC motor:

Animation shows Conventional brushed DC Motor


In the conventional DC motor, a mechanical commutator is used to reverse current through the windings to generate alternating magnetic poles that interact with the stator permanent magnet to create mechanical rotating motion.

BLDC motor:

Animation shows working of BLDC motor


The BLDC motor differs from the conventional DC motor in two aspects: 

Key differences: 

  1. Rotor does not have winding like a conventional DC motor; instead, it is a permanent magnet.
  2. The stator has winding, unlike a conventional DC motor that uses a permanent magnet as a stator.

BLDC motor uses an ‘Electronic Commutator’ that generates a sequence of pulses to create a rotating magnetic field across the stator that pulls/pushes the rotor to generate rotating motion.

A Video on BLDC Motor:




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FAQ Pack: 

Q1. Are BLDC motors AC or DC?

BLDC motors are DC motors in operation, but use an AC current that is converted to DC and electronically commutated through controllers.

Q2. Why are BLDC motors called Brushless DC motors?

They’re called Brushless DC motors because they run on DC input without brushes—electronic commutation replaces mechanical brushes.

Q3. How do BLDC motors differ from AC motors?

BLDC motors use permanent magnets and electronic control, while AC motors rely on alternating supply and induction principles.

Q4. What are the main advantages of BLDC motors?

They offer high efficiency, long life, low maintenance, and better speed control compared to brushed or AC motors.

Q5. Where are BLDC motors commonly used?

They’re widely used in electric vehicles, drones, cooling fans, washing machines, and industrial automation.


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