Analysis of axial force on motors
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During operation, bearings are subject to both radial and axial forces. Why is that? For example, during the no-load operation of a motor, the radial force is something that is easy to understand. When the motor is running without a load, a certain axial force is generated. In my opinion, theoretically there should be no axial force; the reason why centrifugal pumps generate axial force is due to the pressure difference between the front and back of the fluid. So how does this axial force arise when the motor is running without a load? What is its force-applying element?
The axial force of the motor is not very large; generally, deep groove ball bearings are used at both ends of the motor. In my opinion, the axial force on motor bearings arises from the axial movement during rotor rotation.
Is it caused by the range of movement of the bearing balls within the track?
Axial force can also arise from the fact that the geometric center line of the rotor does not coincide with the magnetic center line.
The axial force in a motor is primarily electromagnetic in nature. Axial force can be generated if the stator and rotor are eccentric, or if there is damage to either the rotor or the stator. People often think that motors are simple and that their maintenance is easy as well; however, maintaining other types of motors also requires specific technical skills. It is necessary to measure certain components before reinstalling them to ensure that the motor remains in good condition.
The 4th floor option is the correct one. In the case of asynchronous motors, the magnetic field changes as the voltage fluctuates, but these changes remain within certain limits. Regarding the use of deep groove ball bearings, the axial force is absorbed internally; thus, no axial force is exerted at the output end.