| 简介 |
PROBLEM TO BE SOLVED : To provide a magnetic circuit including a permanent magnet and an excitation coil capable of energizing the excitation coil so as to change over a magnetic action surface between an excitation state and a non-excitation state with less power consumption, without breaking a permanent magnet even when a ferrite magnet or a rare earth magnet is used as the permanent magnet, which is excellent in magnetic characteristic but friable in terms of material.
SOLUTION : The permanent magnet or a permanent magnet assembly is rotatably arranged in a columnar hole enclosed by first and second yokes. When instant energization is performed to the excitation coil so as to rotate the permanent magnet or the permanent magnet assembly, magnetic connection is changed over. Accordingly, the collision of the magnetic polar surface of the permanent magnet or the permanent magnet assembly with the connection surface of the first and second yokes is eliminated so as to prevent the permanent magnet from being broken. Thus, change-over is performed between the excitation state to allow a magnetic flux from the permanent magnet to pass the magnetic action surface and the non-excitation state to allow the magnetic flux not to pass.
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