Supporting structure for slow speed large diameter electrical machines
First Claim
1. An arrangement for mounting the stator and rotor of a rotary electrical machine of the vertical axis type having a form which is generally rotationally symmetrical, said arrangement comprising an outer ring rigid and fixedly secured and two axially spaced inner rings, said outer ring supporting the machine stator and said two axially spaced inner rings arranged concentrically within said outer ring and supporting the machine rotor, means for interconnecting said outer ring with each of said two axially spaced inner rings, said means for interconnecting including a plurality of rigid rectilinear arms which remain inflexible throughout their entire length when subjected to load, all of said rigid rectilinear connecting arms associated with one of said axially spaced inner rings forming identical acute angles both with respect to radial lines directed from the center of said one of said two axially spaced inner rings through respective junction points with said one of said two axially spaced inner rings and with respect to lines tangent to a circle at the respective junction points, said arms being inclined in the same rotational sense.
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Abstract
A supporting structural component such as a bearing for the rotor of a slow speed large diameter electrical machine the rotor of which rotates about a vertical axis comprises concentric inner and outer rings joined by rigid rectilinear spoke-like connecting elements spaced uniformly around THE circumference. The arrangement of these connecting elements is such that they are tangent to the surface of an imagined coaxial cylinder the diameter of which is smaller than that of the inner ring, and the axes of two neighboring connecting elements when imagined as extended in a straight line over both rings intersect only within the inner ring. The connecting elements are inflexible over their whole effective length in the longitudinal direction corresponding to the applied load. Also, the respective axes of all of the spoke-like connecting elements lie at identical acute angles and in the same sense to radii of the inner and outer rings.
59 Citations
17 Claims
- 1. An arrangement for mounting the stator and rotor of a rotary electrical machine of the vertical axis type having a form which is generally rotationally symmetrical, said arrangement comprising an outer ring rigid and fixedly secured and two axially spaced inner rings, said outer ring supporting the machine stator and said two axially spaced inner rings arranged concentrically within said outer ring and supporting the machine rotor, means for interconnecting said outer ring with each of said two axially spaced inner rings, said means for interconnecting including a plurality of rigid rectilinear arms which remain inflexible throughout their entire length when subjected to load, all of said rigid rectilinear connecting arms associated with one of said axially spaced inner rings forming identical acute angles both with respect to radial lines directed from the center of said one of said two axially spaced inner rings through respective junction points with said one of said two axially spaced inner rings and with respect to lines tangent to a circle at the respective junction points, said arms being inclined in the same rotational sense.
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7. An arrangement for mounting a generally rotationally symmetrical component of a rotary electrical machine of the vertical axis type, comprising:
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an outer ring, said outer ring being rigid and fixedly secured; a first inner ring arranged concentrically within the outer ring, said first inner ring supporting a rotor of said rotary electrical machine; means for interconnecting said outer ring with said first inner ring including a plurality of rigid arms, each of the plurality of rigid arms having a first and a second end, the first end of each of the plurality of rigid arms being connected at a first respective junction point to the outer ring and the second end of each of the plurality of rigid arms being connected at a second respective junction point to the first inner ring, each of said plurality of the rigid arms defining a first acute angle with the first inner ring which first acute angle is greater than a second acute angle formed by a line tangent to the first inner ring at the second respective junction point, with all of the rigid arms being oriented similarly in the same rotational sense. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An arrangement for mounting a generally rotationally symmetrical component of a rotary electrical machine of the vertical axis type, comprising:
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an outer ring, said outer ring being rigid and fixedly secured; a first inner ring arranged concentrically within the outer ring, said first inner ring supporting a rotor of said rotary electrical machine; means for interconnecting said outer ring with said first inner ring including a plurality of rigid arms, each of the plurality of rigid arms having a first and a second end, the first end of each of the plurality of rigid arms being connected at a first respective junction point to the outer ring and the second end of each of the plurality of rigid arms being connected at a second respective junction point to the first inner ring, each of said plurality of the rigid arms defining a first acute angle with the first inner ring, which first acute angle is greater than a second acute angle formed by a line tangent to the first inner ring at the second respective junction point, with all of the rigid arms being oriented similarly in the same rotational sense; and a plurality of tie bars, each of said tie bars joining together a pair of adjacent rigid arms at a pair of adjacent first respective junction points on the outer ring. - View Dependent Claims (15, 16)
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17. An electrical machine of vertical construction comprising:
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a stator; a rotor; an outer ring foundation structure surrounding the stator; upper guide bearing means for supporting the rotor; lower thrust bearing means for further supporting the rotor; both bearing means together include central bodies forming a concentric inner ring structure and a plurality of circumferentially extending and uniformly distributed spoke-like arms, the spoke-like arms being located intermediate said inner ring structure and said outer ring foundation structure; means for joining opposite ends of said arms to said inner and outer ring structures with respective axes of said arms forming identical acute angles with radial lines extending respectively from the common center of said inner ring structure and said outer ring foundation structure through corresponding joints which join outer ends of said arms with said outer ring foundation structure; the axes of said arms also forming identical acute angles with lines tangent to a circle at corresponding joints with the inner ring structure; said arms being inflexible over their whole effective length in the longitudinal direction corresponding to the applied load; and all of said arms being inclined in the same rotational sense so as to accomodate torsional stresses imposed upon said inner ring structure caused by thermally induced expansion thereof.
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Specification