Construction of electrical machines
AssigneeNational Research Development Corporation
InventorStephen Williamson
Life of this patent
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Abstract
A polyphase cylindrical electrical machine including a non-salient stator, a rotor and an air-gap therebetween, together with a winding energisable to apply alternating current to exert two magnetic fields to rotate about the machine axis to produce a non-rotating force in a selected direction radially of the machine axis, the fields rotating in the same direction and having pole numbers differing by two, the fields being exerted by said current at one frequency to act on the machine rotor with said non-rotating force.
Claims13
A polyphase cylindrical electrical machine including a non-salient stator, a rotor and an air-gap therebetween, together with a winding energisable to apply alternating current to exert at least two magnetic fields to rotate about the machine axis to provide a non-rotating force in a selected direction radially of the machine axis, the fields rotating in the same direction and having pole numbers differing by two, the fields being exerted by said current at one frequency to act directly and radially on the machine rotor with said non-rotating force.
A method of operating an electrical machine including providing in a stator-rotor air-gap in operation magnetic fields of
- B.sub.1 cos (wt+p.sub.1 .theta.) and B.sub.2 cos (wt+p.sub.2 .theta.)
- in which p.sub.1 -p.sub.2 =.+-.1 and a steady force is exerted on the rotor in the radial direction.
Dependencies are inferred from the claim text.