Fan

Abstract

A fan includes a first motor, a second motor, a rotating shaft and a fan blade. The first motor includes a first coil. A first current flows through the first coil when the fan is electrified. The second motor includes a second coil. A second current flows through the second coil when the fan is electrified. The fan blade is affixed to the rotating shaft. The first motor and the second motor drive the rotating shaft to rotate the fan blade when the fan is electrified.

What is claimed is: 
     
         1 . A fan, comprising:
 a first motor comprising a first coil through which a first current flows when the fan is electrified;   a second motor comprising a second coil through which a second current flows when the fan is electrified;   a rotating shaft; and   a fan blade affixed to the rotating shaft;   wherein the first motor and the second motor drive the rotating shaft to rotate the fan blade when the fan is electrified.   
     
     
         2 . The fan according to  claim 1 , further comprising a shell, both the first motor and the second motor being disposed inside the shell, and the rotating shaft pivoting on the shell. 
     
     
         3 . The fan according to  claim 1 , wherein a ratio of a current value of the second current to a current value of the first current is between 0% and 80%. 
     
     
         4 . The fan according to  claim 1 , wherein the fan blade is a blower fan blade or an axial fan blade. 
     
     
         5 . A fan, comprising:
 a first motor comprising a first coil;   a second motor comprising a second coil;   a control circuit for periodically switching a current value of a current flowing through the first coil and a current value of a current flowing through the second coil, and the current value of the current flowing through the first coil being different from the current value of the current flowing through the second coil;   a rotating shaft; and   a fan blade affixed to the rotating shaft;   wherein the first motor and the second motor drive the rotating shaft to rotate the fan blade when the fan is electrified.   
     
     
         6 . The fan according to  claim 5 , further comprising a shell, both the first motor and the second motor being disposed inside the shell, and the rotating shaft pivoting on the shell. 
     
     
         7 . The fan according to  claim 5 , wherein the control circuit is for transmitting a first current to the first coil and a second current to the second coil during a first time period, and the control circuit is for transmitting the first current to the second coil and the second current to the first coil during a second time period after the first time period. 
     
     
         8 . The fan according to  claim 7 , wherein a span of the first time period is a time period when the fan blade rotates from 0 to 100000 revolutions. 
     
     
         9 . The fan according to  claim 7 , wherein a ratio of a current value of the second current to a current value of the first current is between 0% and 80%. 
     
     
         10 . The fan according to  claim 5 , wherein the fan blade is a blower fan blade or an axial fan blade.