The cause and elimination of noise in small motors

Much of the noise present in electrical motors is due to poor manufacture. Careless or inaccurate manufacturing methods often show up in some manner as uneven air gaps, loose bearings, brush noise, or loose rotor bars.

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[2]  E. E. Dreese.  Synchronous Motor Effects in Induction Machines , 1930, Transactions of the American Institute of Electrical Engineers.

[3]  Gabriel Kron,et al.  Induction Motor Slot Combinations Rules to Predetermine Crawling, Vibration, Noise and Hooks in the Speed-Torque Curve , 1931, Transactions of the American Institute of Electrical Engineers.

[4]  T. Spooner,et al.  Study of Noises in Electrical Apparatus , 1929, Transactions of the American Institute of Electrical Engineers.