Magnetic bearing

• US 20080073993A1
• Filed: 09/22/2006
• Published: 03/27/2008
• Est. Priority Date: 09/22/2006
• Status: Active Grant

• Current Assignee: Johnson Controls Tyco IP Holdings LLP (Johnson Controls International plc)
• Original Assignee: Christopher K. Sortore, Kirk Treubert, Robert Jett Field, Victor Iannello
• Inventors: Iannello, Victor, Treubert, Kirk, Sortore, Christopher K., Field, Robert Jett
• Granted Patent: US 7,471,022 B2
• Time in Patent Office: Days
• US Class Current: 310/90.5
• CPC Class Codes: F16C 32/0459 Details of the magnetic circuit
• CPC Class Codes: F16C 32/047 Details of housings; Mounting of active magnetic bearings
• CPC Class Codes: F16C 32/0489 with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing
• CPC Class Codes: F16C 35/00 Rigid support of bearing units; Housings, e.g. caps, covers F16C23/00 takes precedence

Abstract

Certain exemplary embodiments comprise a system, which can comprise a radial magnetic bearing static portion. The radial magnetic bearing static portion can comprise a plurality of electromagnets. The radial magnetic bearing static portion can comprise a plurality of pulse width modulated amplifiers, each of which can be adapted to provide electrical energy to a corresponding electromagnet of the plurality of electromagnets.

Claims

1. A system comprising:

a rotor comprising;

a radial magnetic bearing rotating portion comprising;

a hub;

a plurality of laminations;

a sensor target ring;

a first touchdown journal; and

a second touchdown journal; and

a stator comprising;

a radial magnetic bearing static portion comprising;

three or more electromagnets, each electromagnet comprised by an electromagnet sector;

a first support plate adapted to support said electromagnet sectors;

a second support plate adapted to support said electromagnet sectors;

three or more pulse width modulated amplifiers, each adapted to provide electrical energy to a corresponding electromagnet of said three or more electromagnets, each of said three or more pulse width modulated amplifiers comprised by a corresponding wedge volume, each wedge volume radially disposed between a pair of said three or more electromagnets;

a first annular circuit board adapted to accept a communicative connection from a network;

a second annular circuit board adapted to provide control signaling to said three or more pulse width modulated amplifiers;

a plurality of position sensors adapted to detect a radial position of said rotor, each of said plurality of position sensors located between a pair of three or more electromagnets;

a touchdown ring adapted to separate said rotor from said stator when no electrical energy is applied to said radial magnetic bearing; and

a thrust magnetic bearing static portion comprising;

two or more electromagnets;

two or more pulse width modulated amplifiers, each adapted to provide electrical energy to a corresponding electromagnet of said two or more electromagnets, each of said two or more pulse width modulated amplifiers comprised by a corresponding wedge volume, each wedge volume radially disposed between a corresponding pair of said two or more electromagnets;

a first annular circuit board adapted to accept a communicative connection from a network; and

a second annular circuit board adapted to provide control signaling to said two or more pulse width modulated amplifiers.

2. A system comprising:

a stator comprising;

a first radial magnetic bearing static portion comprising;

three or more electromagnets, each electromagnet comprised by a modular electromagnet sector; and

three or more pulse width modulated amplifiers, each adapted to provide electrical energy to a corresponding electromagnet of said three or more electromagnets, each of said three or more pulse width modulated amplifiers comprised by a corresponding wedge volume, each wedge volume radially disposed between a pair of said three or more electromagnets.

3. The system of claim 2, further comprising:

a junction box adapted to electrically couple said first radial magnetic bearing static portion to an energy source.

4. The system of claim 2, further comprising:

a second radial magnetic bearing static portion.

5. The system of claim 2, further comprising:

a first radial magnetic bearing rotating portion adapted to be magnetically coupled to said first radial magnetic bearing static portion.

6. The system of claim 2, further comprising:

a first radial magnetic bearing rotating portion adapted to be magnetically coupled to said first radial magnetic bearing static portion, said first radial magnetic bearing rotating portion comprising;

a hub;

a plurality of laminations;

a sensor target ring;

a first touchdown journal; and

a second touchdown journal.

7. The system of claim 2, further comprising:

a support plate adapted to support said three or more electromagnets.

8. The system of claim 2, further comprising:

a first support plate adapted to support said three or more electromagnets; and

a second support plate adapted to support said three or more electromagnets.

9. The system of claim 2, further comprising:

an annular circuit board adapted to accept a communicative connection from a network.

10. The system of claim 2, further comprising:

an annular circuit board adapted to provide control signaling to said three or more pulse width modulated amplifiers.

11. The system of claim 2, further comprising:

a first annular circuit board adapted to accept a communicative connection from a network; and

a second annular circuit board adapted to provide control signaling to said three or more pulse width modulated amplifiers.

12. The system of claim 2, further comprising:

an annular circuit board adapted to accept a communicative connection from a network, said annular circuit board comprising a communications port.

13. The system of claim 2, further comprising:

a plurality of position sensors adapted to detect a radial position of a rotor associated with said stator, each of said plurality of sensors located between a corresponding pair of said three or more electromagnets.

14. The system of claim 2, further comprising:

a plurality of position sensors adapted to detect a radial position of a rotor associated with said stator, each of said plurality of sensors located between a corresponding pair of said three or more electromagnets, wherein said plurality of sensors comprises eight sensors, each offset by approximately 45 degrees.

15. The system of claim 2, further comprising:

a touchdown ring adapted to separate a rotor from said stator when no power is applied to said first radial magnetic bearing.

16. The system of claim 2, further comprising:

a thrust magnetic bearing static portion comprising two or more electromagnets.

17. The system of claim 2, wherein an air gap between a rotating portion of a magnetic bearing comprising said magnetic bearing static portion and said magnetic bearing static portion is less than approximately 0.020 inches.

18. The method of claim 2, wherein a gap defined between a first touchdown ring of a magnetic bearing comprising said magnetic bearing static portion and a rotating portion of said magnetic bearing is less than approximately 0.010 inches.

19. A system comprising:

a stator comprising;

a radial magnetic bearing static portion comprising;

three or more electromagnets, each electromagnet comprised by a modular electromagnet sector; and

an annular circuit board adapted to accept a communicative connection from a network, said annular circuit board adapted to communicate information regarding said radial magnetic bearing static portion via said network.

20. A system comprising:

a stator comprising;

a thrust magnetic bearing static portion comprising;

two or more electromagnets, each electromagnet comprised by a modular electromagnet sector; and

two or more pulse width modulated amplifiers, each adapted to provide electrical energy to a corresponding electromagnet of said two or more electromagnets, each of said two or more pulse width modulated amplifiers comprised by a corresponding wedge volume, each wedge volume radially disposed between a corresponding pair of said two or more electromagnets.

21. A system comprising:

a stator comprising;

a support plate adapted to transfer greater than fifty percent of heat provided from an axial face of said stator, said heat generated by components comprising;

three or more electromagnets comprised by a radial magnetic bearing static portion, each electromagnet comprised by a modular electromagnet sector; and

three or more pulse width modulated amplifiers, each adapted to provide electrical energy to a corresponding electromagnet of said two or more electromagnets, each of said two or more pulse width modulated amplifiers comprised by a corresponding wedge volume, each wedge volume radially disposed between a corresponding pair of said two or more electromagnets.