Permanent magnet electrical machine with low reluctance torque

Details Permanent magnet electrical machine with low reluctance torque Permanent magnet electrical machine with low reluctance torque

1994-04-28

1996-06-04

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310152, 310254, H02K 2112

Patent

active

055236375

ABSTRACT:
A permanent magnet synchronous motor includes a permanent magnet rotor and a stator having wound teeth facing the rotor. The stator teeth each include notches having equal width and having a spacing also equal to the notch width. Further, each adjoining two teeth are separated by a gap having a width equal to the width of the notches on the teeth.
The permanent magnet synchronous motor thus configured provides substantial reductions in reluctance torque, or "cogging torque" over prior art permanent magnet synchronous motors. Further, the frequency of the reluctance torque is increased, a desirable condition, with respect to prior art permanent magnet synchronous motors.

REFERENCES:
patent: 3482156 (1969-12-01), Porath
patent: 3696260 (1972-10-01), Lace
patent: 4672253 (1987-06-01), Tajima et al.
patent: 4678954 (1987-07-01), Takeda et al.
patent: 4823038 (1989-04-01), Mizutani et al.
patent: 4890024 (1989-12-01), Hashimoto et al.
patent: 4972112 (1990-11-01), Kim
patent: 5028073 (1991-07-01), Harms et al.
patent: 5148090 (1992-09-01), Oku et al.
patent: 5220228 (1993-06-01), Sibata
patent: 5250867 (1993-10-01), Gizaw
patent: 5254892 (1993-10-01), Bosman et al.
"Effect of Groove of Teeth on Cogging Torque of Three-Phase Permanent Magnet Motor", by Hazumi et al, pp. 927-932.
"Brushless DC Motors Using Unsymmetrical Field Magnetization", by Kusko et al; IEEE Transactions On Industry Applications, vol. IA-23, No. 2, Mar./Apr. 1987; pp. 319-326.

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