With the increasing demand for energy-efficient products, the use of DC motors in ceiling fans and other household appliances also increased. DC motors and DC converters/drives are alive and well in industry, driven by many applications in which they are the best option. There are reasons why DC motors trump AC motors:
High Torque At Low Speed
Unlike an AC motor, a DC motor delivers constant torque across its entire speed range. Ceiling fans with DC motors create a higher torque, meaning greater initial power and less energy consumptions. DC motors consume 70% less energy than conventional ceiling fan motors. DC motors develop full torque at low speed and across the full operating range from zero to base speed.
Greater Control
DC motors control six speeds settings and reverse function. Generally, these motors are easier to start, stop, and accelerate.
Less electronics and rectification are required to build a DC-converter drive when compared to building an AC-inverter drive. DC motors can be directly fed from different power sources, even batteries.
Central Circuitry
Fans with DC motors have all the electrical components conveninently located in one place atop of the motor assembly, so there's no need for a canopy or switch cup. This makes wiring your ceiling fan during the installation process a lot easier.
Light Weight
DC motors generally weigh less than conventional fan motors, resulting in a lighter product that is easier to installed.
Quiet Operation
DC motors virtually silent, ensuring a quiet operation.
Applications
DC motors are suitable for many applications – including conveyors, turntables and others for which adjustable speed and constant or low-speed torque are required. They also work well in dynamic braking and reversing applications, which are common in many industrial machines.
