| 摘要 |
An electric motor for operation at very high speeds comprises a ferromagnetic stator (11), a ferromagnetic rotor (13) having a rotor core (16) with a plurality of reluctance poles (17) spaced from the stator by an air gap (G), and a rotor shaft (14) supporting the rotor core for rotation in the stator, and a winding (12) on the stator for producing a multipolar magnetic field continuously travelling along the air gap and linking the stator with the reluctance poles of the rotor. At least a part of the outer portion of each reluctance pole (17) of the rotor core (16) forms a saturable surface layer having a saturation flux density which is lower than the flux density in the air gap (G) that saturates the teeth (11A) of the stator (11). The rotor core (16), including the reluctance poles (17), and the rotor shaft (14) are formed from a single solid piece of ferromagnetic material. Preferably, the surface saturable layer includes a multiplicity of thin fins (18) separated by deep and narrow circumferentially extending grooves (19).
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