Control coil arrangement for a rotating machine rotor

• US 6,268,673 B1
• Filed: 05/05/1999
• Issued: 07/31/2001
• Est. Priority Date: 05/05/1999
• Status: Expired due to Fees

• Current Assignee: United States Department of Energy (Government of the United States of America)
• Original Assignee: United States Department of Energy (Government of the United States of America)
• Inventors: Lewandowski, Chad R., Shah, Manoj R.
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Perez, Guillermo
• Application Number:
  US09/305,376
• Time in Patent Office: 818 Days
• Field of Search: 310/90.5, 310/181, 310/216, 310/261, 310/166, 310/157, 310/82, 310/254, 310/263, 310/90, 310/68.B, 310/67.R
• US Class Current: 310/90.5
• CPC Class Codes: F16C 32/0459 Details of the magnetic circuit
• CPC Class Codes: F16C 32/0465 with permanent magnets provided in the magnetic circuit of the electromagnets
• CPC Class Codes: F16C 32/0476 with active support of one degree of freedom, e.g. axial magnetic bearings
• CPC Class Codes: F16C 32/0493 integrated in an electrodynamic machine, e.g. self-bearing motor
• CPC Class Codes: H02K 7/09 with magnetic bearings

Abstract

A rotating machine (e.g., a turbine, motor or generator) is provided wherein a fixed solenoid or other coil configuration is disposed adjacent to one or both ends of the active portion of the machine rotor for producing an axially directed flux in the active portion so as to provide planar axial control at single or multiple locations for rotor balance, levitation, centering, torque and thrust action. Permanent magnets can be used to produce an axial bias magnetic field. The rotor can include magnetic disks disposed in opposed, facing relation to the coil configuration.

Claims

1. A rotating machine comprising:

a stator;

a rotor adapted for rotation relative to the stator and including an active portion;

a thrust bearing comprising first and second coils mounted on a stationery member and disposed adjacent to at least one end of the active portion of the rotor for producing an axially directed flux in said active portion so as to provide rotor balance, levitation, centering, torque and thrust control, and wherein the stationery member comprises first and second sets of axially projecting portions, said first set forming a first discontinuous annulus of a first diameter and said first coil comprising a first plurality of windings individually wound on respective protecting portions of the first set, and said second set forming a second discontinuous annulus with a second diameter being nested within said first annulus, and said second coil comprising a second plurality of windings individually wound on the projecting portions of said second set; and

a permanent magnet supported with said coils on the stationery member.

2. A machine as claimed in claim 1, wherein said coils comprise at least one C-core solenoid coil supported by said stationery member.

3. A machine as claimed in claim 1, wherein said coils comprise at least one E-core solenoid coil supported by said stationary member.

4. A machine as claimed in claim 3, wherein said at least one E-core solenoid coil comprises coils carrying opposite currents.

5. A machine as claimed in claim 1, wherein said thrust bearing is applied directly to said active portion of said rotor.

6. A machine as claimed in claim 1, wherein said permanent magnet comprises a permanent magnetic disk supported on said active portion of said rotor in spaced, opposed relation to said coils.

7. A machine as claimed in claim 1, wherein said permanent magnet is mounted on said stationery member in a radial plane extending between said first and second coils.

8. A machine as claimed in claim 1, wherein said axially projecting portions of said first and second sets each include a radially projected arcuate base portion at an end thereof remote from said rotor and said permanent magnet includes a plurality of arcuate segments forming a discontinuous annulus, each of said arcuate segments being supported between respective pairs of opposed arcuate base portions of the axially projecting portions of said first and second sets.

9. A machine as claimed in claim 1, wherein said active portion includes a magnetic disk at said at least one end thereof.

10. A machine as claimed in claim 9, wherein said active portion includes a non-magnetic barrier disposed at said at least one end for supporting said magnetic disk on said rotor.

11. A machine as claimed in claim 1, wherein said active portion includes a magnetic disk at both ends.