Abstract :
Samuel Noodleman (Delco Products, Dayton, Ohio): The author has presented a very interesting attack on the problem of magnetic noise in single-phase motors. The theory is unique in that it develops a method of calculating the actual harmonic forces which act on the stator. There are, however, conditions which do not seem to agree with the results of this paper. For example, from the assumption of a uniform air gap and constant permeance it would be assumed that the magnetic noise of motors with tunnel-slot rotors would check very nicely with this theory. Actually the magnetic frequency spectra of motors with open-slot rotors agree much closer with the results of this paper than do those having closed rotor slots.
