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The feasibility of zero-power control in flux-path control magnetic suspension is discussed. In the flux-path control magnetic suspension system, ferromagnetic control plates are inserted between a permanent magnet (magnetic source) and a floator and moved to vary the flux from the magnetic source to the floator. The zero-power control has been applied in active magnetic suspension with a DC electromagnet...
This paper proposes a new configuration for rotating gyros using magnetic suspension. A rotating gyro based on an active magnetic bearing (AMB-based gyro) has been proposed. However, the miniaturization of the AMB-based gyro is technically difficult because of the limitations on its design and structures. In contrast, the new configuration suits miniaturization because of the simplicity of rotor design...
The zero-power magnetic suspension system behaves as if it has negative stiffness. Suspension with a similar characteristic can be realized by using a linear actuator such as a voice coil motor. The controllers realizing negative stiffness with a linear actuator are compared with zero-power controllers analytically. The analyses show that they have similar structures. It is pointed out that a control...
This paper studies a noble magnetic suspension whose suspension force is controlled with a variable mutual inductance mechanism. The suspension system has a transformer whose primary coil is energized by an AC power supply. The secondary coil is connected to the coil of an electromagnet for producing suspension force. The variable mutual inductance mechanism changes the coupling factor between the...
This paper presents the development of an active 3-degree-of-freedom (DoF) vibration isolation system using zero-power magnetic suspension. The developed system is capable to suppress direct disturbances and isolate ground vibrations of the 3-DoF motions, associated with vertical translational and rotational modes. Two categories of control strategy for the actuators are proposed, i.e., local control...
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