Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-02-04
1982-12-14
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, 310258, H02K 100
Patent
active
043639879
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to electrical engineering, and more particularly to stators of direct current electrical machines.
BACKGROUND ART
Modern technological advances call for the availability of fast response drives incorporating direct current electrical machines capable of providing variations in the rate of the armature current in excess of 30 nominal values per second, as well as featuring high reliability and high specific characteristics in combination with minimal overall size and weight. Accordingly, this dictates higher structural requirements to the stators of direct current electrical machines, viz. laminated magnetic circuits and optimal utilization of the interior at preset overall dimensions.
Known in the art is a direct current machine stator (cf. British Pat. No. 1,432,700; Cl. H 02 K 1/18; published 1976) comprising a stator support having beams arranged around the center line of the stator, a magnetic circuit incorporating a laminated stator ring or yoke adapted to receive the stator support beams, and pole pieces attached to the yoke. The yoke of the magnetic circuit is assembled bz means of pins from separate L-shaped steel segments or plates disposed lingitudinally of the center line of the stator, whereas the stator support further comprises cross beams welded to the longitudinal beams, the yoke being positioned essentially inside the stator support structure.
However, a disadvantage of this stator construction resides in that large amounts of costly material, such as magnetic steel, are required for the manufacture of the yoke due to irrationally arranged pattern or tailoring thereof.
Also, manual stacking the L-shaped plates into a yoke is a labour consuming operation preventing a mechanized manufacture of the stator, which results in an inferior quality and reduced production efficiency.
DISCLOSURE OF THE INVENTION
The present invention is directed towards the provision of a direct current machine stator incorporating such a structural arrangement of a yoke as to permit an increase in the overall power of the machine, improve the reliability of the stator, raise the production efficiency, reduce the amount of materials consumed in the manufacture and ensure high rates of current variations in the armature.
This is attained by that in a direct current machine stator comprising a support structure having beams disposed around the longitudinal center line of the stator, a magnetic circuit incorporating a yoke adapted to cooperate with support beams, and pole pieces affixed to the yoke, according to the invention, the yoke is in the form of a continuous band coiled into a cylindrical roll or spiral with each turn of the spiral embracing by a wider side thereof all the support beams, the support structure further comprising a pair of frame members positioned at the bases of the cylindrical spiral and having the support beam ends secured thereto.
Preferably, at least one support frame is provided with at least one aperture.
The present invention affords to have the stator manufacture mechanized and automated.
Also, the invention permits to obtain the optimum configuration of the stator thereby enabling an increase in the overall power of the machine at preset size and weight requirements.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in greater detail with reference to a specific embodiment thereof taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a stepped longitudinal section of a direct current machine stator according to the invention;
FIG. 2 shows a cross-section on the line II--II in FIG. 1;
FIG. 3 is a general view of a frame member of the stator according to the invention;
FIG. 4 is a partial view of a support structure according to the invention, a partially cut-away representation;
FIG. 5 shows a section on the line V--V in FIG. 4;
FIG. 6 illustrates a fastening assembly of the starting portion of a band material of the stator according to the invention; and
FIG. 7 shows a section on the line VII--
REFERENCES:
patent: 3200275 (1968-08-01), Lindgren
patent: 3320451 (1967-05-01), Wiley
patent: 3809938 (1974-05-01), Sjoberg et al.
patent: 4102040 (1978-07-01), Rich
patent: 4255684 (1981-03-01), Mischler
Florinsky Eduard A.
Semenkov Leonid I.
Sysoev Valentin S.
Vorotyntseva Ljudmila A.
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