Electricity: motive power systems – Synchronous motor systems – Antihunting or damping
Patent
1998-04-17
1999-08-24
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Antihunting or damping
310156, 310261, 310269, H02K 114, H02K 127
Patent
active
059428732
ABSTRACT:
In a synchronous machine, an armature structure has n (n being a positive integer) salient poles provided at predetermined circumferential distances around a rotary shaft and coils wound on the salient poles respectively, and a field system is constituted by (n-1) permanent magnet pieces arranged like a ring as a whole around the rotary shaft closely to radially outer ends of the salient poles of the armature structure, the respective permanent magnet pieces being magnetized radially so that north and south poles are alternately arranged respectively on inner circumferential surfaces of the permanent magnet pieces, and each of boundary lines between adjacent ones of the permanent magnet pieces is inclined at a predetermined angle relative to a direction parallel to the rotary shaft in such a manner that when the radially outer ends of the salient poles opposite to the inner circumferential surfaces of the permanent magnet pieces are circumferentially developed and projected onto a development where the inner circumferential surfaces of the permanent magnet pieces are circumferentially developed and when a certain one of the boundary lines comes between two of the salient poles adjacent to each other, the one boundary line passes at the same time two diagonally opposite apexes of projected rectangles corresponding to the radially outer ends of the two salient poles adjacent to each other.
REFERENCES:
patent: 3950663 (1976-04-01), Mead
patent: 4933584 (1990-06-01), Harms et al.
patent: 5266859 (1993-11-01), Stanley
patent: 5315198 (1994-05-01), Torok
patent: 5751089 (1998-05-01), Stridsberg
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