Gear Ratio and Induced Speed Range of Magnetic Gearbox with Speed and Load Conditions

Magnetic Gears are a type of non-contact transmission constructed using polar magnets. Their primary advantages include non-contact operation and the elimination of lubrication requirements, rendering them highly suitable for applications where maintenance and contamination are critical concerns. However, the substantial magnetic forces required for their operation may present disadvantages for certain applications, such as those involving sensitive electronics. This paper aims to study the gear ratio mapping the input and output speeds of the gearbox, and the range of magnetic induction speed under different speed and load conditions. The prototype of the gearbox consisting of the lower-speed outer rotor, the high-speed inner rotor, and the stationary flux modulator, was designed and built. The experiments were conducted to observe the rotational speeds of the inner and the outer rotors. The gear ratio of the magnetic gearbox is constant against the speed and the load. However, the range of induced speed is affected by the load. The maximum input speed to generate the rotation of the output rotor decreases with the increasing of the load. The findings of this study offer valuable insights and serve as a reference for the potential applications of magnetic gears in diverse fields, including robotics, renewable energy systems, automotive, and aerospace engineering.