초록 ▼

Potentially very high power ratings can be achieved from rotary electrical generators in which permanent magnet rotor stages using modern high intensity magnetic materials, for example cobalt samarium or neodymium boron iron. The machine described comprises a plurality of axial field rotor stages ea

Potentially very high power ratings can be achieved from rotary electrical generators in which permanent magnet rotor stages using modern high intensity magnetic materials, for example cobalt samarium or neodymium boron iron. The machine described comprises a plurality of axial field rotor stages each comprising a plurality of magnet segments arranged around a driven hub in a pre-stressed assembly in which encompassing hoop means exerts sufficient compressive stress on the magnets and hub assembly to counter centripetal forces generated by speeds of up to 100,000 rpm. Alternative methods of stressing the hoop means is described.

대표청구항 ▼

An axial field electrical generator capable of operating at very high rotational speeds comprising: at least one permanent magnet disc rotor having a plurality of permanent magnet segments equiangularly spaced apart around a hub, said hub containing notches or pockets to engage said permanent magnet

An axial field electrical generator capable of operating at very high rotational speeds comprising: at least one permanent magnet disc rotor having a plurality of permanent magnet segments equiangularly spaced apart around a hub, said hub containing notches or pockets to engage said permanent magnets and with which engagement is maintained during operation by means of pre-stressed hoop means encompassing the hub and magnets, said pre-stressed hoop means being formed initially as a push fit and stressed during assembly with the hub and magnets by expansion of the hub by forcedly fitting into a central bore of the hub a relatively tapered boss; and a stator winding spaced a short axial distance from a face of the disc rotor.