Higher Harmonics and its effect on the stability of the Induction Machine’s work

This paper presents an important idea about the higher harmonics (both temporal and spatial) and the reason of their appearance and negative effects they cause on the electrical power consumers. Generated rotating torques from upper harmonics is then calculated, and their effect on the mechanical characteristics of the induction motor, and how to mitigate this effect depending on motor design. Higher harmonics produce additional electrical and magnetic losses in induction motors which increase the motor’s heat and decrease its energy yield and power coefficient. This research shows how to decrease these losses to improve the mechanical characteristics of the induction motor and enhance the performance.

The Effect of Heavy Oil Temperature on the Hydrodynamical Status of Its Movement Through Tranmission Pipeline

This paper presents a study to reduction of heavy crude oil viscosity by heating, where we select the best of temperature for all types instead of constant temperature, whatever composition and viscosity of crude oil.