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US 4,954,736 AGranted
Permanent magnet rotor with magnets secured by synthetic resin
AssigneeMatsushita Electric Works, Ltd.
InventorsTetsuo Kawamoto, Ryo Motohashi, Toshihiro Sakamoto, Yasuo Suzuki, Hideaki Abe
Life of this patent
Estimating the term…
Abstract
A permanent magnet rotor has a plurality of holding projections radially outward projected from a yoke secured to outer periphery of a rotor shaft, the projections being extended in axial direction of the shaft and yoke while expanded at tip end portions in circumferential directions, and a plurality of permanent magnet segments respectively disposed between adjacent ones of the holding projections to have gaps remained at least partly in the periphery of the segments, the gaps being filled with a thermosetting resin so that constant positioning of the segments with respect to the yoke can be attained with the resin filled.
Claims9
A permanent magnet rotor comprising:
- a rotor shaft;
- a yoke which is coaxially secured to said rotor shaft, said yoke having a central portion and a plurality of magnet-holding projections which project radially outward from the central portion of said yoke and extend in the axial direction of said yoke, each magnet-holding projection having a radially inner end which is secured to the central portion of said yoke and a radially outer end which has a greater width than the radially inner end;
- a plurality of permanent magnet segments which extend in the circumferential direction of said yoke between adjacent magnet-holding projections, each of said magnet segments having end portions cooperating with the radially outer ends of said magnet-holding projections in the circumferential direction of said yoke to prevent the segment from moving radially outward, each segment being separated from said yoke by a gap along at least a portion of its periphery, the end portions being separated from said magnet-holding projections by gaps;
- thermosetting synthetic resin filling the gaps between said magnet segments and said yoke and between the end portions of said segments and said magnet-holding projection and maintains the positions of said permanent magnet segments constant with respect to said yoke;
- and
- said yoke having a recess which is formed on the outer periphery of the central portion of said yoke in the gap between the central portion and said permanent magnet segments, which extends in the axial direction of said yoke, and which is filled with said synthetic resin.
3 more elements
A permanent magnet rotor comprising:
- a rotor shaft;
- a yoke which is coaxially secured to said rotor shaft, said yoke having a central portion and a plurality of magnet-holding projections which project radially outward from the central portion of said yoke and extend in the axial direction of said yoke, each magnet-holding projection having a radially inner end which is secured to the central portion of said yoke and a radially outer end which has a greater width than the radially inner end;
- a plurality of permanent magnet segments which extend in the circumferential direction of said yoke between adjacent magnet-holding projections, each of said magnet segments having end portions cooperating with the radially outer ends of said magnet-holding projections in the circumferential direction of said yoke to prevent the segment from moving radially outward, each segment being separated from said yoke by a gap along at least a portion of its periphery, the end portions being separated from said magnet-holding projections by gaps;
- thermosetting synthetic resin which fills the gaps between said magnet segments and said yoke and between the end portions of said segments and said magnet-holding projections and maintains the positions of said permanent magnet segments constant with respect to said yoke;
- and
- each radially outer end of each of said magnet-holding projections overlapping the end portions of a pair of said permanent magnet segments and being separated therefrom by gaps which are filled by said synthetic resin.
3 more elements
A permanent magnet rotor comprising:
- a rotor shaft;
- a yoke which is coaxially secured to said rotor shaft, said yoke having a central portion and a plurality of magnet-holding projections which project radially outward from the central portion of said yoke and extend in the axial direction of said yoke, each magnet-holding projection having a radially inner end which is secured to the central portion of said yoke and a radially outer end which has a greater width than the radially inner end;
- a plurality of permanent magnet segments which extend in the circumferential direction of said yoke between adjacent magnet-holding projections, each of said magnet segments having end portions cooperating with the radially outer ends of said magnet-holding projections in the circumferential direction of said yoke to prevent the segment from moving radially outward, each segment being separated from said yoke by a gap along at least a portion of its periphery, the end portions being separated from said magnet-holding projections by gaps;
- thermosetting synthetic resin which fills the gaps between said magnet segments and said yoke and between the end portions of said segments and said magnet-holding projections and maintains the positions of said permanent magnet segments constant with respect to said yoke;
- and
- said rotor having axial ends which are covered by said synthetic resin.
3 more elements
Dependencies are inferred from the claim text.