The electromagnetic vibration of the rotor rotation frequency ((1-s)f0P) and the rotating magnetic field synchronization frequency (f0P) may occur simultaneously; the electromagnetic vibration vibrates at the beat of the cycle with a period of 1 (2sf0). Therefore, when the motor load increases greatly, s is increasing, and the vibration tempo is also increasing (the period value is decreased); the motor itself tends to generate electromagnetic noise consistent with the pulsating beat. When the electromagnetic vibration of the rotor winding abnormality is broken, the rotor circuit of the wound asynchronous motor is unbalanced, and an unbalanced electromagnetic force is generated, which is an unbalanced force image. The dynamic air gap in the section changes as the rotor rotates, and the pulsating waveform of the beat is induced to vibrate. Features: (1) The electromagnetic vibration and the electromagnetic vibration generated by the dynamic eccentricity of the rotor are similar and similar in image shape, and are difficult to distinguish. However, when the cage is broken, there is often a burnt stink that causes the insulating paint to coke due to high temperature. (2) When the load increases, it also increases, and the beat period slows down. When the load exceeds 50%, the law is more significant; (3) the vibration disappears after the power is off; (4) For the spectrum analysis of the stator current waveform and the vibration waveform, the side frequency of 2sf0 appears on both sides of the fundamental frequency. After the rotational speed of the structural resonant fan is determined, the rotational frequency of the rotating component has become a fixed value. When the natural frequency of the fan itself or nearby objects is the same or close to the fan rotation frequency, resonance or vibration is formed. For example: (1) After the modified fan, the impeller is too heavy, so that the critical speed of the fan shaft system drops to near the working speed of the fan, and the bending resonance occurs when the critical speed is formed. (2) The basic stiffness is insufficient, the weight is not enough, and its natural frequency is close. Rotation frequency; (3) The air cooler on the motor has insufficient support stiffness, or the connection between the motor and the motor is not good, and excessive forced vibration is formed; (4) other objects, pipes, structures around the fan Resonance. (5) Adjust the resonance of the door actuator transmission rod.
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