| The Indian appliance industry witnessed the arrival of BLDC fans in the year 2012, but is India truly ready for this technological revolution? Let’s dive in and find out!
As a tropical country, India represents a massive fan market, with ~60 million units sold annually. By transitioning to Brushless Direct-Current motor (BLDC) fans, the country has the potential to achieve substantial energy and cost savings, thereby significantly reducing its carbon footprint. Traditional ceiling fans relied on energy-hungry induction motors for years. However, a new era has dawned with the rise of BLDC technology, offering energy-efficient fans without compromising on-air delivery. BLDC fans can slash power consumption up to 69% due to their advantages over induction motors: lower electricity usage, lesser noise and enhanced lifespan. The Indian appliance industr witnessed the arrival of BLDC fans in the year 2012. Let’s dive in to see our progress so far…
Energy savings and sustainability
Firstly, BLDC Motor Fans offer remarkable energy efficiency, setting them apart from traditional AC Motor Fans. The energy consumption of AC Motor Fans remains high even at lower speeds. In contrast, BLDC Motor Fans are designed to operate efficiently at variable speeds,
consuming significantly less energy as the speed decreases. BLDC Motor Fans can consume up to 70% less energy than their AC counterparts. This impressive energy efficiency helps reduce overall energy consumption and contributes to a reduced carbon footprint. Given the significant contribution of 400 million fans in India to greenhouse gas emissions, adopting BLDC Motor Fans presents a valuable
opportunity for households and commercial establishments. This will help the country’s initiative in creating a greener and more sustainable future. India has pledged to decrease its emissions intensity from the 2005 levels by 35% by 2030. To promote energy efficiency, the Energy Efficiency Services Limited (EESL) has planned the deployment of 10 million energy-efficient fans (both 3-star and 5-star rated) across India starting September 2023 to reduce energy consumption, contributing to sustainable energy management. Secondly, DC fans boast a longer lifespan than traditional AC motor fans. AC fans tend to wear out over time, decreasing performance and efficiency. In contrast, BLDC Motor Fans do not have carbon brushes, resulting in a significantly longer lifespan, reducing the replacement frequency and minimising discarded fans’ waste. Moreover, BLDC motor fans have a significant advantage as they last much longer on battery backup and inverters. With their
low energy consumption, they can operate up to thrice longer on inverter backup, making them especially beneficial in regions like rural areas in India where uninterrupted electricity supply is a challenge. In addition to cost savings, BLDC motor fans offer environmental
benefits by reducing electricity consumption, lowering carbon emissions and supporting sustainability efforts. This is crucial in a country like India.
BLDC v/s AC induction motor
A BLDC motor comprises a rotor made up of permanent magnets and a stator with windings. Unlike an AC induction motor, where the magnetic field is generated in the stato and induces a current in the rotor, in a BLDC motor, the permanent magnets generate the magnetic field in the rotor and the stator contains the windings. The current to a BLDC motor is a constant direct current, while the motor requires a varying current to move. The electronic controller provides this varying current with a microcontroller. This controller switches the current in the stator windings on and off in a sequence. This switching sequence (or communication) creates a rotating magnetic field in the
stator that interacts with the magnetic field from the permanent magnets in the rotor. This interaction generates torque, causing the rotor to spin and drive the fan blades. The electronic controller can precisely control the switching sequence, allowing for precise speed control. This contrasts with the slip-in AC induction motor, which makes precise speed challenging. Furthermore, a BLDC motor uses permanent magnets
rather than inducing a current in the rotor, generating less heat, thus leading to less energy wastage and a longer lifespan in principle. In contrast to ACIM, BLDC motors can achieve a near-unity power factor. This is because the electronic controller in a BLDC motor can adjust the current to align with the voltage, minimising phase differences. When the current and voltage waveforms are in phase (i.e. they reach their peak values simultaneously), the power factor is 1.0, and there is no wasted power. This improves efficiency and reduces the power supply load, leading to potential cost savings for the electricity grid.
BLDC manufacturing and supply chain
The manufacturing process of BLDC fans is markedly different from that of conventional fans with AC induction motors, both in terms of motor manufacturing and the supply chain.
Dr Mayur Sundararajan, Business Head, Superfan, Versa Drives
• Motor manufacturing:
Manufacturing a BLDC motor involves the assembly of permanent magnets on the rotor and windings on the stator. The stator winding process is similar to AC induction motors and includes permanent magnets in the rotor. These magnets need to be correctly aligned and securely attached.
• Electronics manufacturing:
The electronic controller requires some specialised manufacturing techniques. The manufacturing of BLDC fans requires the assembly of varied electronic components, such as semiconductors, capacitors and resistors, onto a printed circuit board.
• Firmware embedding:
The firmware for the electronic controller is another critical aspect of a BLDC fan, as it requires programming the microcontroller. The
embedded firmware is then tested to ensure that it operates correctly and provides the desired operation.
• Supply chain:
The supply chain for BLDC fans is different: the permanent magnets in the rotor are sourced from specialised suppliers. Similarly, the electronic components for the controller require a supply chain that can provide high-quality electronic parts.
Conclusion
Notably, India’s fan industry has witnessed substantial export growth in recent years, showcasing the industry’s standards and progress as recorded in India. This also aligns with India’s pursuit of net-zero carbon emissions by 2070, supported by several astute initiatives. In the era of evolving consumer preferences, government policies promoting sustainability and a growing awareness of eco-friendly lifestyles, adopting BLDC fans is poised for remarkable growth. The revolutionary impact of BLDC fans is set to reshape the fan industry, introducing a wave of highly efficient, environment-friendly solutions.
