The invention relates to a stator, a motor and a wind power generator set. The stator comprises a stator support with a first supporting component and a second supporting component; the stator further comprises at least one rigidity adjustment device; the first end of the rigidity adjustment device is connected with the first supporting component; the second end of the rigidity adjustment device is fixedly connected with the supporting component; and the rigidity adjustment device is used for applying adjustable forces onto the first supporting component and the second supporting component respectively, so that the rigidity of the stator can change. The axial natural frequency of the rotor can be adjusted through the rigidity adjustment device, and thus, axial resonance can be avoided. The stator of the invention is applicable to a generator or a motor.