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US 5,952,755 AGranted
Permanent magnet motor rotor
AssigneeElectric Boat Corporation
InventorMichael J. Lubas
Life of this patent
Estimating the term…
Abstract
A permanent magnet motor rotor arrangement including a rotor core having radial and angular positioning surfaces provides for inexpensive and precise positional control of rotor components.
Claims12
A permanent magnet motor rotor including a rotor core assembly comprising:
- a plurality of angularly distributed solid pole pieces;
- a rotor hub having at least two surfaces which engage the pole pieces and position the pole piece radially and in the angular direction, wherein the rotor hub surfaces for positioning the pole pieces in the angular direction include a plurality of flat surfaces and wherein each flat surface is parallel to a radial plane which passes both through the axis of the rotor and through the centerline of a pole piece;
- a plurality of permanent magnets disposed between the pole pieces;
- and
- a plurality of tapered key means for securing the pole pieces to the rotor hub, the key means being disposed between the pole pieces and the rotor hub.
2 more elements
A method of securely positioning pole pieces and permanent magnets in a permanent magnet motor rotor comprising:
- providing a plurality of angularly distributed solid pole pieces,
- providing a rotor hub having at least two surfaces which engage the pole pieces to position the pole pieces radially and in the angular direction, wherein the rotor hub surfaces for positioning the pole piece in the angular direction include a plurality of flat surfaces and wherein each flat surface is parallel to a radial plane which passes both through the axis of the rotor and through the centerline of the pole piece;
- providing a plurality of permanent magnets disposed between the pole pieces, and
- providing a plurality of tapered key means for securing the pole pieces to the rotor hub, the key means being disposed between the pole pieces and the rotor hub.
1 more element
Dependencies are inferred from the claim text.