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Method for servicing the dryer oven motor
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Publication time:
2018-05-16
The motors used in drying ovens also belong to a specific type of motor, so their maintenance process is similar. The maintenance process for drying oven motors includes: cleaning the stator and rotor—replacing carbon brushes or other components—vacuum impregnation with Class F paint under pressure—drying—and adjusting dynamic balancing.
1. The operating environment should always be kept dry; the surface of the high-temperature motor in the drying oven must remain clean, and the air inlet opening must not be blocked by dust, fibers, or other contaminants.
2. When the engine’s thermal protection trips continuously, it is necessary to determine whether the fault is caused by an engine overload or by a protective device setting that is too low. After the fault has been rectified, the engine can be restarted and put back into operation.
3. Ensure reliable lubrication of the motor during operation. Conventional motors should have their lubricating grease supplemented or replaced after approximately 5,000 hours of operation. If overheating of the bearings or a deterioration in lubricant quality is detected during operation, the hydraulic pressure should be used to promptly replace the lubricating grease. When replacing the lubricating grease, the old lubricating oil must be removed, and the bearing oil grooves and bearing cover must be cleaned with gasoline. Then, fill the space between the inner and outer rings of the bearing with lithium-based grease ZL-3 to 1/2 full (for 2-pole motors) or to 2/3 full (for 4-, 6-, and 8-pole motors).
4. When the bearing’s service life comes to an end, vibration and noise during engine operation significantly increase. When the radial clearance of the bearing reaches the following values, the bearing should be replaced.
5. When disassembling the motor, the rotor can be removed either from the end equipped with the shaft extension or from the opposite end that does not have an extension. If there is no need to remove the fan, it is still more convenient to extract the rotor from the end that does not have the shaft extension. When removing the rotor from the stator, care must be taken to prevent damage to the stator windings or insulation.
6. When replacing the winding, it is necessary to record the shape, dimensions, number of turns, and wire cross-section of the original winding. If this information has been lost, it should be obtained from the manufacturer. Arbitrary modifications to the original winding design often degrade one or more performance characteristics of high-temperature motors for drying ovens, to the point where they become unsuitable for operation.
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