| 摘要 |
In the present motor, the annular magnetized portion (5) of the rotor is secured to a portion (9) of a roller bearing via a planar annular disk (7) of which the planar annular surfaces are in contact with respective planar annular surfaces of said rotor portion (5) and of said portion of the roller bearing (9). The invention may be particularly applied to two stage motors of the above-mentioned type. It enables, with a simple and economical structure, to achieve a very high precision in the definition of the position of the magnetized portion of the rotor with respect to the stator.
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