Abstract
Magnetic gear trains transmit torque through noncontact magnetic couplings rather than conjugate gear teeth; they have the unique advantages of reduced maintenance and improved reliability, inherent overload protection, high efficiency, precise peak torque transmission, and tolerance for misalignment. Smooth and steadily transmitted torque is an important characteristic for a magnetic gear train. It is necessary for the reduction of possible mechanical vibration, position inaccuracy, and acoustic noise. This paper investigates the transmitted torque characteristics, especially torque ripple reduction, of an external-meshed magnetic gear train using finite-element analysis (FEA). The topological structure and working principles of a simple magnetic gear train with parallel axes are introduced. With the aid of a commercial FEA package, the transmitted torque waveform of a magnetic gear train is numerically calculated. The effects of geometrical parameters on the maximum transmitted torque and torque ripple are further discussed in terms of obtaining a magnetic gear train with high transmitted torque or low torque ripple. This examination offers insights beneficial to future magnetic gear mechanism design.
Highlights
A traditional gear is a mechanical component with a conjugate tooth profile
Based on the above discussions, the effective strategy for designing an external-meshed magnetic gear train with high transmitted torque is to decrease the number of pole pairs as well as the length of the air gap for the sector-shaped magnets, to select permanent magnets with sector-shaped and parallel magnetization, and to prevent magnetic saturation within the iron yoke
To construct an external-meshed magnetic gear train with low torque ripple, it is necessary to increase the number of pole pairs as well as the length of the air gap of the sector-shaped magnets, to select permanent magnets with a rectangular shape, and to prevent magnetic saturation within the iron yoke
Summary
A traditional gear is a mechanical component with a conjugate tooth profile. It is commonly used in the transmission systems of industrial machines. These advantages include reduced maintenance and improved reliability, inherent overload protection, high efficiency, precise peak torque transmission, tolerance for misalignment, and physical isolation between the input and output shafts. Due to these features, magnetic gear mechanisms have been attracting increasing attention from commercial organizations and academic institutions. Because the driving magnetic gear rotates at a constant angular speed, the driven magnetic gear continuously accelerates and decelerates This may result in undesirable cyclic stress, mechanical vibration, position inaccuracy, acoustic noise, and other problems [7]. The suppression of torque ripple has become
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