Brush-Less Direct Current (BLDC) motor is a new technology that manipultes DC current using microcontrollers and MOSFET to create pwm signals in DC current thus modifying input signal of the coils in the motor. The pulse width modulation of the input signal is altered to increase and reduce the speed of the fan. BLDC technology uses permanent magnets to create a permanent magnet field for the fan. A conventional fan uses a simple capacitor and AC current to drive the motor of the fan. There are no permanent magnet or Printed Circuit board inside the fan. However the rotor of the fan is non magnetic and the magnet is induced in it when AC current is being run through the fan.
In a BLDC motor, we use printed circuit board (PCB) and permanent magnets. The board has two parts the first part convert AC current at 220 VAC 50 Hz to DC current. The second part uses microcontroller couple with MOSFETS to create customise signals in DC current instead of AC current at a very short distance is far more efficient as compared to AC current. Usually the DC current directly at the product supply reduces power losses. However, in case of AC power supply, AC power is best for transmission over long distances but they can be used to operate appliances as well. we require a capacitor to crudely modulate the ac signal for the motor, but through this inefficient process the losses are to high as compared to bidc technology.
First of all, there is nothing to worry about regarding this jerk. In the bldc motor, we use segments of permanent magnets with opposing poles when the power is turned on these poles have to align with the poles on the stator this alignment of poles causes the fan to take realignment jerk before the fan Starts.
There are many advantages of bldc technology over conventional motor. The most important one’s are as follows:
- The bldc technology is far more efficient as compared to conventional motor.
- The bldc technology, consequently, is far more energy conservative and environmentally friendly as compared to old conventional technology.
- The speed regulation of a conventional fan is far more difficult as compared to the speed regulation of a bldc fan. The speed dimmer coupled with the uninterrupted power supply (UPS) may cause humming noises on conventional fan. The bldc fans available in the market have remote controlled speeds. (Do not use fan dimmer or speed regulators for bldc technology).
- Conventional fan requires the voltage to be stable at 220VAC for it to work on optimum conditions however in case of bldc technology the switch mode power supply (SMPS) regulates a consistent output of power even if the input power is variable up to variation of +100V.
No, the Difference in cost no way indicates that the two technologies are any way similar. Yes, if you wish to upgrade your fan from conventional fan to bldc fan we can buy your old fan back at a depreciated cost and the amount we owe you can be adjusted in the purchase of newer fan. This opportunity is for the existing customer of our brand only.
Yes. The advanced microcontroller inside the printed circuit board of the fan has programming that identifies whether the WAPDA power supply is available or not. In case the WAPDA power is lost, the PCB switches to other power supply of DC source automatically.
For a good and optimum air throw, the minimum height required for a fan to work properly its blades need to be 3 m / 10 ft from the ground. It is also advise that the blades of the ceiling fan should be at 0.5m / 1.5 ft from the ceiling and 1.5m // 5 ft from the side walls, for better air flow.
The key component or the group of components inside the bldc printed circuit board is the switch mode power supply (SMPS). SMPS is being used in all the new technology is currently around the world it exists in our televisions (LCD/LED), inverter air conditioners, LED lights, mobile chargers, laptop chargers and so on. Wonderful thing about SMPS is that it works on a wide range of input voltage often ranging between 180VAC upto 240VAC input supply. In Pakistan, the greatest threat to SMPS supply is mainly the following:
- Unregulated frequency in the power supply which often is originated from low quality generators/gensets, with bad or no AVR function that controls the frequency.
- Wapda supply from your nearest transformer where the transformer is not currently connected to any earth cable or there has been no earth cable connected to the supply in your household. This causes the voltage and the phaseshift frequency to be unstable causing all the SMPS and also sometimes the AC based induction appliances to also burnout.
- The sub standard uninterrupted power supplies (UPS) locally manufactured and untested available.
- Although SMPS has a wide range of input power supply, it does have its limits. Any voltage that is higher than 270 VAC whether its for even a milli-second will cause one of the safety functions in the PCB to blow out. At extremely low voltage is the PCB will automatically shut down without any damage.
