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Why Blower Motor Is Easy To Break Shaft Failure?
May 16, 2018


The customer seldom complains about the failure of the broken shaft. The reasons are: 1) the operating period exceeds the warranty period; 2) the additional impact load under the equipment fault condition. Today we only discuss the problem of the breaking of the blower motor.

High risk factor for broken shaft of blower motor

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When the blower motor is running, the dust generated by the impeller generates exciting force, and surge under fault conditions generates additional impact load.

Large factors cause the blower motor to easily break the shaft.

Impeller dust problem

The vibration of the bearing at the beginning of the operation of the fan is very small, but with the increase of the operation time, the dust in the fan will be uneven

Evenly attached to the impeller gradually destroys the dynamic balance of the fan and gradually increases the vibration of the bearing. Once the vibration reaches the fan

The maximum allowed, the fan must be shut down for repair.

Surge problem

The fan has periodic outflow and backflow, and the flow repeats periodically, causing the fan itself to generate severe vibration. At the same time

Work noise plus. Serious surges may cause damage to the equipment and bearings and cause accidents.

The motor breaks due to coordination problems

If the assembly between the drive motor and the high pressure blower is relatively good, the output shaft of the drive motor will only be subjected to rotational force (torque), and the operation will be smooth and free from pulsation.

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At the same time, the output shaft of the drive motor is also subjected to radial forces from the input of the high-pressure blower. The effect of this radial force will force the output shaft of the drive motor to bend, and the direction of bending will change as the output shaft rotates.

If the error of concentricity is large, the radial force will increase the local temperature of the output shaft of the motor, and the metal structure will be continuously destroyed, eventually resulting in the output shaft of the drive motor being broken due to local fatigue. The greater the error in the concentricity between the two, the shorter the time that the output shaft of the drive motor breaks.

At the same time as the output shaft of the drive motor is broken, the high pressure blower input also receives radial forces from the output shaft of the drive motor. If this radial force exceeds the maximum radial load that the input of the high pressure blower can withstand, The result will also cause deformation or even fracture at the input of the high pressure blower or damage to the input end support bearing.