【 Heat exchange fan 】 Relaxed and it's as simple as that

The cooling fan is used in substation with ac power supply: only one winding single-phase ac motor, the rotor's cage.
when single-phase sinusoidal current through the stator winding, the motor can produce an alternating magnetic field, the magnetic field strength and direction of interplanting sine law of change at any time, but on the spatial orientation is fixed, so the magnetic field is also called alternation pulse magnetic field. This alternation pulse magnetic field can be decomposed into two at the same speed and direction of rotation are instead of a rotating magnetic field, when the rotor static, the two rotating magnetic field generated in the rotor torque of two equal and opposite, making synthetic torque is zero, so the motor can't rotate.
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link: automobile cooling fans, http:///products- 细节。 asp吗? Cpid = 121
link: supply auto cooling fan at http:///products- 细节。 asp吗? cpid = 122