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US 5,642,009 AGranted
Quasi square-wave back-EMF permanent magnet AC machines with five or more phases
AssigneeElectric Power Research Institute, Inc.
InventorsPatrick J. McCleer, J. Milton Bailey, Jack S. Lawler
Life of this patent
Estimating the term…
Abstract
A new class of higher phase-order (five or more) quasi square-wave back emf permanent magnet machines including radial, axial and linear embodiments which employ a greater number of active phase windings during continuous operation, thereby utilizing more of the machine copper and magnet material.
Claims6
A permanent magnet axial air gap synchronous machine comprising:
- a rotor, said rotor further comprising,
- a rotor core including a plurality of pie-shaped solid permanent magnet wedges arranged at equal angular intervals around a central axis to define a disk, each two adjacent of said permanent magnets being of opposite polarity, and a pitch of each of said permanent magnets defining one rotor pole;
- and
- a stator for exciting said rotor to move, said stator further comprising,
- a pair of stator disks, each concentrically facing a respective one of two opposite sides of said rotor disk, each stator disk being a solid disk, and
- a plurality of stator windings wound around each stator disk to form N stator phases, N being an odd number .gtoreq.5, and said stator windings being wound around each stator disk to define stator poles having a pitch substantially equal to a pitch of said rotor permanent magnets.
3 more elements
Dependencies are inferred from the claim text.