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I need to find out how calculate magnetic forces appearing in AC induction motor rotor when it is not magnetically centered inside the stator.
I don't understand what that means. Can you make a picture and upload it here using the UPLOAD button?when it is not magnetically centered inside the stator
The magnetic centering force is a function of the magnetizing current of the motor (basically the no load amperage of the motor), air gap flux density, air gap radial distance, number of aligned rotor and stator segments (ends of rotor, and stator and radial air ducts), voltage, air gap axial length and axial misalignment between the rotor and stator. [22, 23] The magnetic centering force increases from zero when the motor is operating on its magnetic center (magnetic equilibrium), while the rotor is displaced axially relative to the stator. See Figure 15. Typically, at a 0.125” axial displacement, non-ducted rotors may develop 50 to 150 pounds of axial centering force, whereas rotors with 12 radial ventilating ducts aligned with stator duct may develop up to several hundred pounds. At start-up, these motors will develop axial forces up to three times these steady state values.
Well, EXcuuuusse Me!I ask for advise to somebody with experience and not somebody advising me to "to expand my vocabulary and then phrase a well stated question" An expert in the matter (if there is one in this group) will understand my problem and would offer directions. The website jim hardy posted is vague and not very conclusive. OK for a begginer.
It takes a lot of nerve to call Jim Hardy a beginner!!OK for a begginer.
You should have read the paper that Jim Hardy linked. There is a bibliography at the end. Reference #22 has the title AXIAL MAGNETIC FORCES ON INDUCTION MACHINE ROTORS.Probably you never have to calculate it because you did not have to design the thrust bearing for a gear increaser coupled to a 1600 kw AV induction motor.
I ask for advise to somebody with experience and not somebody advising me to "to expand my vocabulary and then phrase a well stated question" An expert in the matter (if there is one in this group) will understand my problem and would offer directions. The website jim hardy posted is vague and not very conclusive. OK for a begginer.
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