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Motor using permanent magnet rotor
| Details |
Inventors: Lai, Ching-Feng; Chang, Yu-Choung; Hsiao, Tse-Liang; Yang, Chun-Chung; Liang, Kun-I; Huang, Ann;
Assignee: Industrial Technology Research Institute (Hsinchu, TW)
Primary Examiner: Nguyen; Tran
Assistant Examiner:
Attorney, Agent or Firm: Troxell Law Office PLLC
The present invention relates to a permanent magnet rotor comprising a rotary iron core formed by stacking a plurality of round steel plates, and a plurality of arc-shaped permanent magnets, wherein said individual arc-shaped permanent magnets of alternation poles are provided in the corresponding openings. In particular, the present invention discloses round-cornered permanent magnets by providing round instead of sharp comers at outer perimeter of two adjacent permanent magnets so as to form triangle-shaped regions. Moreover, to prevent said open areas from being filled up, portions of steel plates or holes through steel plates opposite said open areas are removed or created, respectively, so that magnetic flux leakage is minimized and motor performance is elevated. |
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DETAILED DESCRIPTION An object of the present invention is to provide a permanent magnet rotor structure using plug-in type arc-shaped permanent magnets, capable of reducing magnetic flux leakage and elevating overall motor performance.
To that end, the present invention reveals a permanent magnet rotor, comprising a rotary iron core formed by stacking a plurality of round steel plates, and a plurality of arc-shaped permanent magnets.
Each round steel plate has, on its circumference, a plurality of individual arc-shaped openings separated from one another.
A permanent magnet of suitable size and shape is provided in an arc-shaped opening.
Said permanent magnets of alternating poles are so arranged that each permanent magnet be provided in a corresponding opening.
The characteristics of the present invention include round-cornered design by removing sharp cornered areas in outer perimeter corners of two adjacent permanent magnets 13 so as to help form open triangle-shaped regions not fully occupied by solid steel plates, said open triangle-shaped regions being formed by removing portions of or creating holes in said steel plates.
The magnetic flux is thus reduced and the motor efficiency elevated.
In one aspect of the present invention, said steel plates having portions removed are provided by creating v-shaped grooves on the outer wall of steel plates so that the tip of v-shaped grooves points the round-cornered areas.
In another aspect of the present invention, said steel plates having holes created are provided by generating triangle-shaped channels on the portions of steel plates opposite round-cornered areas.
In yet another aspect of the present invention, coordination of orientation for steel plates is achieved by marking the same depression on the same location of individual steel plates, each plate having a depression on one side and a corresponding elevation on the opposite side thereof, and stacking a plurality of said steel plates so that the depressions of individual steel plates fit one upon another
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Generators or Motors 
