Abstract: A motor rotor includes a rotor core and a plurality of reluctance parts. The rotor core includes a plurality of metal parts and an inner hole for the motor rotor, the inner hole of the motor rotor passes through the rotor core, and the areas of the metal parts form a rotor metal total area ?Ametal. The plurality of reluctance parts are disposed surrounding the inner hole of the motor rotor, each of the reluctance parts comprising a plurality of flux barriers penetrating through the rotor core. The areas of the flux barriers in all the reluctance parts form a flux barrier total area ?Aair. The sum of ?Aair and ?Ametal is a rotor effective total area, and the ratio of ?Aair to the rotor effective total area is a flux barrier ratio KA, which is expressed as K A = ? A air ? A air + ? A metal , and satisfies 0.25?KA?0.5.

Abstract: Disclosed are a Saussurea involucrate extract, pharmaceutical composition and use thereof for anti-fatigue and anti-aging. In the embodiments of the present invention, a low dose of ethyl acetate fraction of Saussurea involucrate (preferably 30 mg/kg) and Rutin (preferably 30 mg/kg) can inhibit MDA expression level and increase GPx activity. Additionally, both decrease the expression of COX-2, PARP and caspase-3, via downregulation of NF-kappaB, resulting in neuroprotection. Further, syringe feeding of Saussurea involucrate extract is also performed in aging mouse model. In the future, Saussurea involucrate extract of the present invention can be used in neuroprotection, particularly in treatment or prevention of cerebral diseases, nerve diseases, neurodegenerative diseases, chronic neurodegenerative diseases, aging, and fatigue, caused by oxidative injury.