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Laminated stator core

  • US 4,085,347 A
  • Filed: 01/16/1976
  • Issued: 04/18/1978
  • Est. Priority Date: 01/16/1976
  • Status: Expired due to Term
First Claim
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1. A laminated magnetic core comprising a plurality of magnetic laminations arranged in abutting relation in a stack having opposite end surfaces, a circumferential side surface, and an axial bore adapted to receive a rotor member, said lamination defining interlaminar regions, each lamination having at least two spaced apart pressure points for receiving axially directed compressive forces applied to said end surfaces of said stack, said laminations being secured together in a unitary structure by partial saturation and penetration of said stack with a minute, predetermined amount of adhesive material disposed within a portion of said interlaminar regions, said portion constituting interlaminar bonding regions situated intermediate of and isolated with respect to each other and another portion of said interlaminar regions, said another portion constituting interlaminar regions of axial pressure concentration which surround said pressure points, said interlaminar bonding regions and said interlaminar regions of axial pressure concentration constituting only part of said interlaminar regions, said axial pressure concentration regions and said interlaminar regions other than said interlaminar bonding regions being completely free of said adhesive material, said regions free of adhesive including interlaminar regions between said axial pressure concentration regions and said bore, said adhesive material being applied to preselected side surface areas of said core, said adhesive material entering between adjacent laminations and migrating therein by capillary action, the areas of application being circumferentially intermediate of said pressure concentration regions and extending axially along the length of said core, the amount of adhesive material being limited to the quantity required to sustain capillary migration only within said isolated interlaminar bonding regions, said amount being insufficient to sustain further capillary migration from said isolated interlaminar bonding regions into said interlaminar regions other than said interlaminar bonding regions.

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