Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-09-30
1994-02-22
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 45, 310112, 310156, 310162, 310179, 310254, H02K 122
Patent
active
052890724
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an electrical machine, specifically a rectifier-energized synchronous machine on the transversal flow principle. A machine designed according to this operating principle is known from DE-PS 37 05 089.
The so-called transversal flow concept is based on exciting the stator field not in the longitudinal direction of the machine--i.e., parallel to the axis of rotation of the rotor--but in peripheral direction, that is, along the direction of movement as the rotor rotates. To that end, the rotor has at least a pole structure of two side-by-side rows of permanent magnets alternately magnetized in peripheral direction and soft iron elements, the two rows being separated by an intermediate layer of magnetically and electrically nonconductive material. In principle, this pole structure is of drum shape.
The stator consists essentially of two parts, namely an outer stator arranged radially outside the pole structure and an inside stator arranged radially within the pole structure. Each stator part features soft iron armature elements which essentially are fashioned U-shaped and whose open shanks are opposed in magnets of the rotors, from radially inside or radially outside, across an air gap. The prior machine features for excitation, for each stator part, an annular winding extending in peripheral direction.
With this arrangement characterized by a simple winding structure and with a direction of magnetic flux extending transverse to the direction of movement, high power densities can be achieved, especially when selecting small pole pitches. The electrical lead to the two annular windings of the stator halves must be passed through the armature elements. For removal of the heat accuring in the windings there are as well only the spaces between the armature elements available. On the inside stator, however, the spaces between the armature elements are at identical pole number and smaller radius considerably smaller than on the outside stator. Thus, the space conditions are especially unfavorable for the inside stator, entailing problems in the feed line design, winding structure and assembly of the inside stator.
SUMMARY OF THE INVENTION
The problem underlying the invention consists in improving the winding structure and the excitation of an electrical machine of the initially named category to the effect that the line routing, heat removal and assembly will be facilitated.
This problem is solved in that the excitation of the stator is concentrated in a sole annular winding extending in peripheral direction and in that this sole annular winding is accommodated only in one of the two stator halves. The other stator half thus remains void of an annular winding and, thus, magnetically inactive. This stator half forms thus a magnetic back circuit between the two permanent magnet rows on the pole structure of the rotor. This measure entails a significant simplification of the winding structure on the motor and a considerably simplified assembly, in conjunction with elevated operational safety, specifically as regards the insulation resistance in view of the heat load to be expected.
In one embodiment of the invention, the sole annular winding is disposed in the outside stator, allowing the inside stator to remain void of a winding. The armature elements of the no-winding stator part may be fashioned as laminated back circuit elements, specifically as C-cores, and arranged in the peripheral direction at a spacing corresponding to twice the pole pitch on the pole structure of the rotor. The armature elements of the stator part accommodating the annular winding may be fashioned as well as C-cores which embrace the annular winding in U-shaped fashion on three sides. The rotor may feature two pole structures which are arranged symmetrically on both sides of the central plate, with the two pertaining stators having a structure such that the sole annular windings are always arranged in the same stator part, i.e., on the inside stator or preferably on the outside stator. Th
REFERENCES:
patent: 2427584 (1947-09-01), Welch
patent: 4433260 (1984-02-01), Weisboard
patent: 4757220 (1988-06-01), Pouillange
patent: 4758756 (1988-07-01), Pouillange
patent: 4973868 (1990-11-01), Wust
patent: 5051641 (1991-09-01), Weh
J. M. Voith GmbH
Skudy R.
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