Abstract
A novel flux control magnetic suspension system that places control plates beside the magnetic source (permanent magnet) is proposed. In a conventional flux-path control magnetic suspension system, the control plates were inserted between the magnetic source and the suspended object (floator). In contrast, the control plates were placed beside the magnetic source in the proposed system. In such a configuration, the effective gap becomes larger than in the conventional system. Basic characteristics of the proposed magnetic suspension system were studied both numerically and experimentally. The numerical analyses show that the attractive force acting on the floator increases as the position of the lateral ring-shape control plate increases. The variation of the attractive force is sufficient for the stabilization of the suspension system. It is also shown that lateral force can be generated by dividing the plates into halves and moving them differentially. The predicted characteristics are confirmed experimentally in a fabricated apparatus with a three-axis force sensor and a gap adjustment mechanism.
Highlights
Magnetic suspension is a technology of suspending an object using magnetic force without any contact
In the flux-path control magnetic suspension system, the attractive force of the permanent magnet is controlled by varying the amount of flux that reaches the suspended object
When the control plates are placed at the highest position, where the top of the control plates is aligned with that of the permanent magnet, the attractive force becomes larger because the control plates work as yoke
Summary
Magnetic suspension is a technology of suspending an object using magnetic force without any contact. In the original variable flux-path mechanism, ferromagnetic control plates are inserted into the gap between the magnetic source (permanent magnet) and the floator (ferromagnetic body). This is referred to as the flux-interrupted type. One of the reasons is that the flux flowing into the control plates and the leakage flux are rather large and resultantly the flux reaching the floator is small To overcome this problem, another type has been proposed in which ferromagnetic control plates are replaced by plates made of permanent magnet. A new configuration of variable flux-path control mechanism, which is characterized by placing control plates beside a magnetic source, is proposed This configuration is referred to as a laterally controlled type
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