초록 ▼

An electrical machine has a rotor shaft (12) which carries a plurality of rotor discs (14) for rotation therewith. Each rotor disc (14) has pairs of rotor rims (16) secured thereto. Each rotor rim (16) consists of a single row of alternate magnets (20) and laminated pole pieces (18) and is opposed b

An electrical machine has a rotor shaft (12) which carries a plurality of rotor discs (14) for rotation therewith. Each rotor disc (14) has pairs of rotor rims (16) secured thereto. Each rotor rim (16) consists of a single row of alternate magnets (20) and laminated pole pieces (18) and is opposed by a series of stator cores (22) which straddle the rotor rim (16). Armature windings (24) are disposed within the stator cores (22) for operably exciting said stator. The phase relationship between the currents through the armature windings (24) and the orientation of the stator cores (22) or the magnets (20) in opposing rims (16) are such that the effects of electromagnetic coupling, long path fluxes and torque ripple is reduced.

대표청구항 ▼

[ I claim:] [1.] An electrical machine comprising a rotor including a rotor shaft for rotation about an axis and at least one disc extending from the rotor shaft for rotation therewith, the rotor disc having at least one pair of circumferential rotor rims secured to the rotor disc, the rims in each

[ I claim:] [1.] An electrical machine comprising a rotor including a rotor shaft for rotation about an axis and at least one disc extending from the rotor shaft for rotation therewith, the rotor disc having at least one pair of circumferential rotor rims secured to the rotor disc, the rims in each pair being secure at the same radial location on opposite sides of the rotor disc, each rotor rim comprising alternate magnets and pole pieces and being opposed by a stator assembly comprising stator cores which are disposed adjacent and facing the rotor rim, armature windings being disposed within the stator cores for operably exciting said stator assembly, the armature windings for a pair of rotor rims at a particular radial location on the disc being excited by electrical currents which are in antiphase, said stator cores providing with said magnets flux paths having either a long or a short length as said rotor moves said rims relative to said stator assembly and where said long flux path is equal and opposite in each rim located on opposite sides of said disc at said same radial location.