Difference Between Ac And Dc Motor Ceiling Fans
The principle difference between DC and AC ceiling fans is a matter of electrical current and the motor itself.
AC means alternating current while DC means direct current. So the primary difference between AC and DC motors is very plain as the names suggest – while AC motors convert electrical energy to mechanical energy using alternating current while DC motors use direct current for the same.
Alternating current comes from an external power source through a wall outlet. Contrary to this, direct current comes from power sources such as batteries and fuel cells. The power source and motor difference have a considerable bearing on the performance and efficiency of a ceiling fan.
AC Ceiling Fans vs. DC Ceiling Fans
In a ceiling fan having DC motor, the current passes through a series of magnets with opposite polarity. The resistance between the magnets creates a torque which powers the rotor. The resultant effect is – higher torque, better speed control, and quiet operation. Owing to these benefits, a DC ceiling fan is more durable and energy efficient than an AC ceiling fan.
Furthermore, while AC ceiling fans have can be powered with a wall switch and a reliable external power source, DC ceiling fans have to controlled by a remote.
What Is A Dc Motor?
A DC motor is one that converts the direct current electrical energy into mechanical energy. Most common types of DC motors rely on magnetic fields and the forces they produce. A simple DC motor usually has set of magnets fixed in the stator along with an armature having one or more windings of insulated wire wrapped around a soft iron core for the purpose of concentrating the magnetic field. The ends of the winding wires are connected to a ‘commutator’ that powers up each armature while connecting the winding coils to the external power supply through ‘brushes’.
When the direct current passes through a magnetic field, it creates a torque which causes the machine to move. This movement is called as motoring action. The direction and magnitude of the magnetic field created by the coil can be altered by changing the direction and magnitude of the current flowing through it
What’s Inside Your Ceiling Fan Motor?
In conventional ceiling fans, single phase induction motor is used. These motors consume minimum power and hence, are also known as fractional kilowatt motors. A single phase induction motor requires only one power phase for operating. It converts the electrical energy from the power input into mechanical energy.
The motor has several components within. Let us break it down to get an in-depth knowledge.
Wires- These are the conductors that carry the electrical current to a set of winding copper coils.
Windings- The copper coils called ‘windings’ are wrapped around steel bars or laminations.
Stator- As the polarity fluctuates, it creates a rotating magnetic field. This magnetic field induces a current within the laminations in the rotor, causing it to spin around the stationary stator.
Rotor- The rotor is positioned at an angle from the stator. The distance between these two and the geometry of slots carved into each set of laminations together give rise to two out-of-phase magnetic fields. Since the rotor repels the rotating magnetic field induced by the stator, it starts spinning.
Housing- This is the outer covering that envelops the rotor as it revolves on bearings around the stator.
Ceiling Fan Motor Quality
Ceiling fans are designed keeping in mind the price, style, and performance. And different kinds of motors are utilized according to these requirements. While small and inexpensive motors cause the fans to become wobbly and noisy with time, fans equipped with large and high-performance motors are much more durable and efficient. Here is a classification of motors used in ceiling fans according to their size and their corresponding features:
153 mm: This is an average motor that provides less air movement and may become noisy and wobbly with time and constant usage.
172 mm: This motor is slightly better than the previous one and gives better air movement. It is a good option for small and less used spaces.
188 mm: This motor is great and provides excellent air movement. You won’t face any stability or noise issues with fans having this motor.
212 mm: Like the one above, this too is an excellent motor that is very durable and sturdy.
K55: A slightly expensive motor, its performance is outstanding. Needless to say that it is extremely durable.
DC: DC motor is presently the most technologically advanced and energy efficient motors available in the market. They are known to consume up to 75% less energy while generating high power.
How Does A Ceiling Fan Work?
The ceiling fan has a motor that converts electrical energy into mechanical energy. First, the capacitor of the ceiling fan torques up the electric motor, thereby causing it to start and run. As the electrical current reaches the motor, it enters coils of wire that are wrapped around a metal base. When this current passes through the wire, it creates a magnetic field which further exerts force in a clockwise motion. In this way, the electric energy is converted into mechanical energy and causes the motor coils to spin. The blades attached to the motor also start gaining motion with the spinning of the coils.