| 摘要 |
A magnetic base including a rotary magnetic element, two symmetrical magnetic plate assemblies covered around the rotary magnetic element, and two non-magnetic blocks connected between the magnetic plate assemblies at different elevations; in which, each magnetic plate assembly consists of a stack of iron plates, each iron plate having two notches at one side near two opposite ends, and a flange at each notch; each non non-magnetic block has two opposite projecting portions respectively fitted into the respective notches of the iron plates and engaged with the respective flanges.
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