Brushless motors are used worldwide for their basic benefit of optimizing performance per package size which no other technology can match it. In addition, brushless brings tremendous advantages to many applications, combining the best features and benefits of past successful designs while incorporating unique advantages.
BLDC motors offer several advantages over brushed DC motors, including higher efficiency and reliability, reduced noise, longer lifetime (no brush and commutator erosion), elimination of ionizing sparks from the commutator, more power, and overall reduction of electromagnetic interference (EMI). In general, BLDC motors are more efficient at converting electricity into mechanical power than brushed DC motors. This improvement is largely due to the absence of electrical and friction losses in the brushes.
WHY BLDC FOR CEILING FANS?
Today the typical ceiling fan is based on AC motors which are power hungry. Along with this, the typical AC motor based fans have the RPM control through the capacitor or resistor based regulators and is not efficient as there is loss in the regulator itself to some extent. In addition the RPM control is by controlling the voltage and the voltage fluctuations of the Mains make it very challenging to have constant RPM based on the AC mains supply. Further, existing AC motor solution, results in power factor (PF) degradation with no improvement for PF and there are other ill effects like harmonics injection to the AC mains, etc.
The total amount of air flow or displacement is based on the blade size & RPM and does not change due to any other factor. The proposed solution is to keep the same air flow or displacement with less of energy usage along with improving the PF using the BLDC motor based ceiling fans.
Typical BLDC motor based ceiling fan has much better efficiency and excellent constant RPM control as it operates out of fixed DC Voltage.