The problem of axial turbulence during motor operation is always more or less present and is difficult to avoid. When the amount of turbulence reaches a certain level, the supporting equipment or the motor may be seriously damaged. Today, Dalan Motor Xiaobian analyzes the yaw axis problem of the Y2 aluminum shell three-phase asynchronous motor to minimize the probability of occurrence.
Generally, the motor is axially fixed at one end and the other end is a floating end. The small size is only supported by the bearing assembly, especially the motor using the sealing bearing, and the bearing cap is not installed. Therefore, it often happens that the fixed end is not completely fixed, the supporting equipment is subjected to unintended axial sway; the coupling of the small-sized motor shaft and the bearing is too loose, and the bearing axially pulsates under the action of the vibration force.
Analysis of the causes of axial turbulence:
(1) When the clearance between the shaft and the rotor is too large, the relative movement of the rotor and the shaft causes the stator core to be in a misaligned state, thereby aggravating the axial movement of the rotor and the shaft relative to the stator.
(2) Wave spring washers will be installed on both ends of the motor bearing. If it is not installed or the quality of the spring washer is not enough, it will cause this problem.
(3) The axial force generated by the fan as the motor runs, that is, the axial force of the wind on the fan blade. This effect will be less for low speed motors, but for motors with relatively fast speeds and relatively loose radial fits.
(4) The axial force due to the change of the electromagnetic field when the axial alignment of the stator is not good. This problem will exist for every motor, because it is difficult for any motor manufacturer to fully align the two. In the process of motor production and processing, the horseshoe, the spring opening, the bottom of the cast aluminum rotor, and the radial air circulation are all caused by different degrees of misalignment.
(5) For the sliding bearing motor, the magnetic center line misalignment causes the shaft to sway.
(6) The bearing and the shaft, the bearing and the bearing housing of the end cover have a large clearance caused by the gap, and this situation also has the problem of the running circle of the bearing.
For the axial turbulence problem, the large-size motor adopts the one end positioning of the bearing cover to solve the problem. It can be adjusted by adding a wave washer between the bearing end face and the axial direction of the end cap. For the motor without the bearing inner cover, Add a retaining ring groove in the end cap bearing chamber and install the bearing retaining ring during assembly.
For horizontally mounted motors, the ideal solution to this problem is to ensure the alignment of the stator and rotor, but for the vertical installation of the motor, the effect of the rotor's own weight on the turbulence should also be considered.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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