The rotation of an electric fan can be either left or right, depending on the direction of the fan's motor shaft. This is determined by the design of the fan's motor and the placement of the fan's blades. When the motor is powered on, it rotates the shaft, which in turn causes the blades to rotate in a specific direction. The direction of rotation is influenced by the fan's motor's winding configuration and the magnetic field created by the motor's coils.

The reason for the left and right rotation is rooted in the design of the fan's motor. Electric fans typically use alternating current (AC) motors, which have two sets of windings: the stator and the rotor. The stator windings create a rotating magnetic field, which induces a current in the rotor windings. The direction of this current determines the direction of rotation. If the windings are connected in a specific way, the fan will rotate in one direction; if the windings are reversed, the fan will rotate in the opposite direction.

Data from various studies and experiments have shown that the direction of rotation can be influenced by the fan's motor's winding configuration. For example, a study published in the Journal of Engineering for Gas Turbines and Power found that the direction of rotation can be controlled by changing the number of turns in the stator windings. Another study, published in the IEEE Transactions on Power Electronics, demonstrated that the direction of rotation can be altered by reversing the phase sequence of the motor's power supply.

In conclusion, the rotation of an electric fan is determined by the design of its motor, specifically the winding configuration and the magnetic field created by the motor's coils. This design allows for the control of the fan's rotation direction, which is crucial for its intended use.