Segmented stator with improved handling and winding characteristics

• US 7,471,025 B2
• Filed: 02/12/2008
• Issued: 12/30/2008
• Est. Priority Date: 10/31/2002
• Status: Expired due to Term

• Current Assignee: Nidec Motor Corporation (Nidec Corporation)
• Original Assignee: Emerson Electric Company
• Inventors: Sheeran, Kent A., Rassoolkhani, Payman, Michaels, Paul G.
• Primary Examiner(s): Le; Dang D
• Application Number:
  US12/029,998
• Publication Number:
  US 20080129142A1
• Time in Patent Office: 322 Days
• Field of Search: 310216-218
• US Class Current: 310/216.009
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 15/095 by laying conductors around salient poles
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2203/12 Machines characterised by the bobbins for supporting the windings
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49078 Laminated
• CPC Class Codes: Y10T 29/53143 Motor or generator
• CPC Class Codes: Y10T 29/53196 Means to apply magnetic force directly to position or hold work part

Abstract

A stator assembly has discrete stacks of laminations. A plurality of nonmagnetic containment structures define pockets. The stacks are at least partially received in the pockets and coupled to one another by the containment structure. The containment structures are moveable between a first configuration in which the stacks are separate from one another and a second configuration in which yokes of adjacent stacks are in physical contact with one another. In a method of making a stator assembly, a plurality of stator segments are positioned so each is received in one of a plurality of pockets in a containment structure. Coils are wound around each stator segment while the containment structure prevents the stator segment from having direct physical contact with another stator segment. The containment structure is reconfigured to bring the wound stator segments into contact with one another, thereby forming a closed magnetic circuit.

Claims

1. A stator assembly comprising:

a plurality of discrete stacks of laminations, each of the stacks having a yoke and a tooth extending away from the yoke; and

a plurality of nonmagnetic containment structures defining pockets, the stacks being at least partially received in the pockets, the containment structures coupling the stacks to one another, the containment structures being moveable between a first configuration in which the stacks are separate from one another and a second configuration in which the yokes of adjacent stacks are in physical contact with one another to form a magnetic circuit.

2. A stator assembly as set forth in claim 1 wherein the second configuration comprises an annular configuration.

3. A stator assembly as set forth in claim 1 wherein each containment structure comprises a hinge for facilitating pivoting movement of the containment structure between the first and second configurations.

4. A stator assembly as set forth in claim 1 wherein the containment structures are further movable between a straight configuration in which the teeth of each stack are evenly spaced and arranged in a line and an open configuration in which the yokes of at least some adjacent stacks are arranged in an accurate configuration such that the spacing between the respective teeth is increased relative to the spacing of the straight configuration.

5. A stator assembly as set forth in claim 1 further comprising a continuous first wire, a continuous second wire, and a continuous third wire, each of the first, second, and third wires being coiled around at least one of said stacks.

6. A stator assembly as set forth in claim 5 wherein each of the first, second, and third wires is coiled around multiple stacks.

7. A stator assembly as set forth in claim 1 wherein each of the stacks includes two opposite ends and a middle extending between said ends and the containment structures include a first containment structure positioned to cap one of said ends of two or more of the stacks and a second containment structure positioned to cap another of said ends of said two or more stacks.

8. A stator assembly as set forth in claim 7 wherein the first and second containment structures contact one another adjacent the middles of the stacks.