As the core power equipment, the air gap uniformity between the stator and rotor of large electric motors in thermal power plants, as well as the component neutrality, directly affect the operational stability, energy consumption, and service life. During the disassembly and maintenance process, the screw jack, with its advantages of precise controllability, strong load-bearing capacity, and convenient operation, has become a key tool for air gap adjustment and alignment correction, effectively ensuring that the maintenance quality meets the standards.

During the disassembly and maintenance of an electric motor, the stator and rotor are prone to displacement due to disassembly and transportation, resulting in uneven air gap and unilateral magnetic pulling force, exacerbating component wear and vibration. At this point, it is necessary to use a screw jack in conjunction with a feeler gauge for measurement. The jack should be arranged reasonably at the symmetrical part of the stator shell, and the lifting height should be slowly adjusted. The clearance at different positions should be checked point by point to ensure that the deviation of the clearance at each point does not exceed ± 5% of the design value, until the clearance is uniform and consistent, eliminating the hidden danger of magnetic pulling force.

In the alignment adjustment link, whether it is the concentricity correction of rotor and stator, or the axis alignment of motor and load equipment, the screw jack can accurately generate force. By fine-tuning the stroke of the jack at the motor base or end cover, and monitoring the deviation with a dial gauge, the displacement is gradually corrected to align the rotor axis with the stator axis, meeting the radial and axial alignment standards, and avoiding problems such as coupling wear and bearing overheating during operation.

During operation, it is necessary to strictly follow the maintenance regulations. The support points of the jack should be firm and reliable, and the adjustment should be slow and uniform to avoid damage to the motor components caused by impact loads. With the precise adjustment capability of the screw jack, the maintenance efficiency can be greatly improved, ensuring that the air gap and alignment accuracy of large electric motors after maintenance meet the specifications, and providing strong guarantees for the safe, stable, and efficient operation of thermal power plants.