Permanent magnet motor

Details Permanent magnet motor Permanent magnet motor

1994-05-25

1996-04-23

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2112

Patent

active

055106625

ABSTRACT:
In a permanent magnet motor, a stator includes an annular stator core and a plurality of stator windings wound on the stator core so that a plurality of phases are composed. A rotor is rotatably mounted with a predetermined air gap between it and an inner peripheral face of the stator core. The rotor includes a rotor core having a plurality of slots and a plurality of permanent magnets embedded in the slots respectively. Each permanent magnet having a generally arc-shaped cross section is embedded in the slot so that its convex portion is directed toward a rotor axis. Each permanent magnet is magnetized so that directions of easy magnetization are concentrated on a point C at a side of center of curvature thereof. The relation between a distance L between the point C and a center line passing the center of each permanent magnet in the direction of the thickness thereof and a mean radius of curvature R of the permanent magnets is shown by the expression, 1.0.times.R.ltoreq.L.ltoreq.7.5.times.R.

REFERENCES:
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patent: 4725750 (1988-02-01), Welch
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patent: 4924130 (1990-05-01), Fratta
patent: 5191256 (1993-03-01), Reiter, Jr. et al.
IEEE Transactions on Power Apparatus and System, vol. PAS-101, No. 4 Apr. 1982, V. B. Honsinger, "The Field And Parameters Of Interior Type AC Permanent Magnet Machines".
Siemens Review XLIII (1976). No. 6 Wolfgang Volkrodt "Machines Of Medium-High Rating With A Ferrite-Magnet Field".

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