Rotary Coupling Magnetic Field Characteristics of a Two-Degree-of-Freedom Direct Drive Induction Motor

摘要

A two-degree-of-freedom direct drive induction motor is investigated in this study. Owing to its special structure and motion forms, coupling magnetic fields are generated inside the motor, which links with the main magnetic field and results in low speeds and high fluctuations. In this paper, a three-dimensional finite element model of the two-degree-of-freedom direct drive induction motor is developed to determine the rotary coupling magnetic field and its effect on the motor. The distribution of the rotary coupling magnetic field is calculated qualitatively based on a simplified model, and its variation law is investigated based on the changes of the induced voltages in a special coupling model. Moreover, the relationship between the rotary coupling magnetic field and the motor speed is determined by the rotary coupling coefficient. A test platform is applied to verify the coupling model and its results.