| 摘要 |
In order to detect the angular position of a permanent magnet rotor (13) of a brushless motor, measuring means are connected to the windings of the stator in such a way as to form an oscillatory circuit and the variations in the frequency of resonance as a function of the position of rotor are measured. In order to augment these variations, the rotor has a non-magnetic structure (26) around the magnet (14) with zones of different thicknesses or of different permeabilities. This structure can be formed by a metal sleeve, of brass for example, having openings or recesses (44) which can be filled with a dielectric material.
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