End iron axial flux damper system

• US 4,152,615 A
• Filed: 06/14/1977
• Issued: 05/01/1979
• Est. Priority Date: 06/14/1977
• Status: Expired due to Term

• Current Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Calfo, Raymond M., Vanek, Larry D.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/806,403
• Time in Patent Office: 686 Days
• Field of Search: 310/256, 310/260, 310/52, 310/54, 310/58, 310/59, 310/60, 310/65, 310/64, 336/84, 336/84 M
• US Class Current: 310/256
• CPC Class Codes: H02K 3/42 Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding
• CPC Class Codes: Y10S 174/19 in a dynamo-electric machine
• CPC Class Codes: Y10S 174/32 having means for cooling

Abstract

Disclosed is an alternating current dynamoelectric machine which has damper plates of low resistivity material over the ends of the stator'"'"'s tooth region to prevent axial flux from entering the stator'"'"'s core. This invention also provides for cooling of the damper plates by the inclusion of cooling ducts within the damper plates. The flow of cooling fluid through the ducts cools the damper plates and also the end region of the dynamoelectric machine.

Claims

1. A dynamoelectric machine with a generally tubular shaped stator, said stator comprising:

a generally tubular-shaped core section which includes a plurality of laminated segments with a plurality of slots alternating with a plurality of teeth around said core'"'"'s inner periphery;

on each end of said laminated segments is a finger plate with a plurality of slots alternating with a plurality of teeth around said plate'"'"'s inner periphery and said finger plate'"'"'s teeth being positioned over and in alignment with said core section'"'"'s teeth;

located over the outer face of each finger plate is an end plate assembly which comprises of an annular end plate that covers the outer annular portion of said finger plate and a plurality of low resistivity damper plates, the bases of said damper plates being clamped between said end plate and said finger plate and extending radially inward beyond the inner circumference of said annular end plate toward the center of said stator, each damper plate being sized such that it fits flush over and in alignment with said finger plate'"'"'s teeth; and

located within each of said damper plates are cooling ducts for the passage of cooling fluid, said cooling ducts are connected in series around the circumference of said stator'"'"'s core;

said series being broken at one point and connected to a cooling input manifold by an input duct and the other point of said series being connected to output manifold by an output duct facilitating the flow of cooling fluid through said damper plates'"'"' ducts.

2. A dynamoelectric machine with a generally tubular shaped stator with a rotor mounted within said stator and comprising:

a generally tubular-shaped core section which includes a plurality of laminated segments with a plurality of slots alternating with a plurality of teeth around said core'"'"'s inner periphery;

on each end of said segments is a finger plate with a plurality of slots alternating with a plurality of teeth around said plate'"'"'s inner periphery and said finger plate'"'"'s teeth being positioned over and in alignment with said core section'"'"'s teeth;

located over the outer face of each finger plate is an end plate assembly which comprises of an annular end plate that covers the outer circumference of said finger plate, a plurality of low resistivity damper plates of a trapezpoidal-shaped sections, the base of which fits between said annular end plate and said finger plate, and extends radially inwards beyond the inner circumference of said annular end plate towards the center of said stator, each damper plate being sized such that it fits flush over and in alignment with said finger plate'"'"'s teeth; and

located within each of said damper plates are cooling ducts for the passage of cooling fluid, said cooling ducts being connected in series around the circumference of said stator'"'"'s core;

said series being broken at one point and connected to a cooling input manifold by an input duct and the other point being connected to output manifold by an output duct facilitating the flow of cooling fluid through said damper plates'"'"' ducts.