Why do we use BLDC motors?

Why BLDC motor is so popular?

The brushless DC motor is becoming increasingly popular in the industrial and HVAC sectors as it negates the mechanical commutator used in traditional motors. The brushless DC motor (BLDC) replaces the mechanical commutator with an electronic device which improves the reliability and durability of the unit.

Why BLDC motors are more efficient?

A BLDC motor can generate full torque at zero speed. The motors are usually smaller for any given power level, and the rotor with permanent magnets is lighter than a corresponding induction rotor. Both of these traits allow a BLDC motor to respond much faster to changing load condition.

What is BLDC motor advantages and disadvantages?

They are also compact in size and provides high torque with better speed control and efficiency. On the other hand, it also has a few disadvantages like higher cost, resonance issue, and complex wiring setup due to the involvement of electronic control.

What are the disadvantages of BLDC motor?

Disadvantages of brushless DC motors:

  • Cost: Rare-earth permanent magnets are much more expensive than other permanent magnets, which leads to an increase in motor costs.
  • Limited constant power range: A large constant power range is critical to achieving high vehicle efficiency.
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What is disadvantage of BLDC fan?

Disadvantages: Less efficient as compared to BLDC motors on an average. Lower power factor and can at best give power factor of 85% (or 0.85). Motion generates heat that can reduce efficiency of the motor.

Which is better BLDC or induction motor?

The DC brushless drive can also operate at unity power factor, whereas the best power factor for the induction drive is about 85 percent. This means that the peak point energy efficiency for a DC brushless drive will typically be a few percentage points higher than for an induction drive.

Is BLDC fan better than induction motor?

Compared to regular induction fan, a BLDC fan can save upto Rs 1000-1500/ Year/fan. And because there is no heating of the motor, the life of a BLDC fan is also expected to be much higher than ordinary fans.

Is BLDC a DC or AC motor?

The BLDC unit is designed to operate from DC which is switched as required by the motor. AC motors tend to be large, steady state, single speed style of motors powered by mains electricity. BLDCs are a lot better at handling different speeds (in very general terms). An AC motor is defined from the AC supply.

What are the types of BLDC motor?

BLDC motors are available in three configurations: single-phase, two-phase, and three-phase.

What is the difference between BLDC motor and DC motor?

Like a brushed motor, a brushless motor works by alternating the polarity of windings inside the motor. It is essentially an inside out brushed motor, which eliminates the need for brushes. In a brushless DC motor, the permanent magnets are fitted to the rotor, with the electromagnets on the stator.

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What are the basic features of BLDC motor?


Details Characteristics Advantages
Permanent magnet brushless DC motordesign Essentially linear torque/speed curve (neglecting iron losses), with torque proportional to current and speed proportional to voltage Ease of speed and position control

What is the disadvantage of the BLDC sensorless control?

There is one major disadvantage to sensorless BLDC motor control; when the motor is stationary, no back EMF is generated, depriving the MCU of information about the stator and rotor position. The solution is to start the motor in an open loop configuration by energizing the coils in a pre-determined sequence.

Is BLDC Fan good?

Most of the BLDC ceiling fans are 5-star rated consuming 25-40 watts of energy, which is about 40-70% less than the regular old fans. Also, BLDC fans do not require installation of an additional regulator which saves 200-500 rupees upfront.