Synchronous reluctance electrical motor having a low torque-ripp

Details Synchronous reluctance electrical motor having a low torque-ripp Synchronous reluctance electrical motor having a low torque-ripp

1996-06-28

1998-10-06

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310152, 310163, 310211, 310261, H02K 1926, H02K 2100, H02K 2302

Patent

active

058181407

ABSTRACT:
A synchronous reluctance electrical motor, including a stator having an even number of slots per pair of poles equal to n.sub.s, a rotor of the transverse lamination type having an even number n.sub.r of equivalent slots per pair of poles, and an air gap separating the stator from the rotor, wherein, in order to minimize the torque ripple, between the number n.sub.s of the stator slots and the number n.sub.r of the rotor equivalent slots the following relationships are satisfied: n.sub.s -n.sub.r .noteq.0, +2, -2; n.sub.r >6; n.sub.s .noteq.m.multidot.n.sub.r, m being an integer, and preferably also the following relationship: n.sub.s -n.sub.r =.+-.4 . The rotor of this motor may have insulating layers open to the air gap and/or insulating layers closed towards the air gap by iron ribs suitable for being magnetically saturated; other iron ribs may traverse some insulating layers in intermediate positions thereof. Preferably the rotor layers are designed with constant permeance, in order to avoid producing harmonics capable of interacting with harmonics produced by the stator windings.

REFERENCES:
patent: 3671789 (1972-06-01), Menzies
patent: 3678436 (1972-07-01), Herdrich et al.
patent: 3679924 (1972-07-01), Menzies
patent: 3758800 (1973-09-01), McLaughlin
patent: 4358697 (1982-11-01), Liu et al.
patent: 4663551 (1987-05-01), Weh et al.
patent: 4888513 (1989-12-01), Fratta
patent: 4924130 (1990-05-01), Fratta
Vagati, A., "The Synchronous Reluctance Solution: A New Alternative in A.C. Drives", Proceedings of the IECON '94, 1994, pp. 1-11.

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