Modular system for suspending and rotating a rotary shaft

• US 20040189126A1
• Filed: 03/05/2004
• Published: 09/30/2004
• Est. Priority Date: 09/06/2001
• Status: Abandoned Application

• Current Assignee: Societe De Mecanique Magnetique Co.
• Original Assignee: Societe De Mecanique Magnetique Co.
• Inventors: Brunet, Maurice, Lapierre, Armand
• Application Number:
  US10/488,819
• Publication Number:
  US 20040189126A1
• Time in Patent Office: Days
• US Class Current: 310/90.5
• CPC Class Codes: F16C 2360/42 Pumps with cylinders or pistons in general F04B
• CPC Class Codes: F16C 32/0468 of moving parts of the magnetic circuit, e.g. of the rotor
• 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: H02K 1/28 Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
• CPC Class Codes: H02K 7/003 Couplings; Details of shafts means for mounting rotors on shafts H02K1/28
• CPC Class Codes: H02K 7/09 with magnetic bearings

Abstract

The system for suspending and rotating a rotary shaft comprises a motor module (100) comprising a central rotary shaft (110) having at each end a front annular bearing surface (120) defining a conical region (130), a first magnetic bearing module (200) that comprises a rotary shaft (210) having at one end a front annular bearing surface (220) defining a conical region (230) and is adapted to cooperate with one of the front annular bearing surfaces (120) of the motor module (100), and a second magnetic bearing module (300) that comprises a rotary shaft (310) having at one end a front annular bearing surface (320) defining a conical region (330) and is adapted to cooperate with the other front annular bearing surface (120) of the motor module (100). The motor module (100) and the first and second magnetic bearing modules (200, 300) are centered with respect to each other by co-operation between the conical regions (130, 230, 330) and are assembled firmly with a contact pressure by means of a tie-rod (400).

Claims

1. A system for suspending and rotating a rotary shaft and characterized in that it comprises:

a motor module (100) comprising a central rotary shaft (110) having at each end a first front annular bearing surface (120) defining a first conical region (130),

a first magnetic bearing module (200) comprising a first rotary shaft (210) that has at one end a second front annular bearing surface (220) defining a second conical region (230) and is adapted to co-operate with one of said first annual front bearing surfaces (120) of the motor module (100), and

a second magnetic bearing module (300) comprising a second rotary shaft (310) that has at one end a third front annular bearing surface (320) defining a third conical region (330) and is adapted to co-operate with the other of the first front annular bearing surfaces (120) of the motor module (100), and in that the motor module (100) and the first and second magnetic bearing modules (200, 300) are centered with respect to each other by co-operation of the first conical regions (130) with the second and third conical regions (230, 330) and are firmly assembled with a contact pressure between, firstly, the first front annular bearing surfaces (120) and, secondly, the second and third front annular bearing surfaces (220, 320) applied by means of a tie-rod (400) with threaded ends (410) screwed into the first and second magnetic bearing modules (200, 300) and passing through axially aligned first, second and third bores (140, 240, 340) in the motor module (100) and the first and second magnetic bearing modules (200, 300), respectively.

2. A suspension system according to claim 1, characterized in that the first, second and third front annular bearing surfaces (120, 220, 320) of the motor module (100) and the first and second magnetic bearing modules (200, 300) are perpendicular to a rotation axis of the central rotary shaft (110).

3. A suspension system according to either claim 1 or claim 2, characterized in that the first conical regions (130) are concave and clampingly interengage with the second and third conical regions (230, 330), which are convex.

4. A suspension system according to either claim 1 or claim 2, characterized in that at least one first conical region is convex and clampingly interengages with a second or third conical region that is concave.

5. A suspension system according to any one of claims 1 to 4, characterized in that the first conical region (130) and/or the second conical region (230) and/or the third conical region (330) is a standard solid cone.

6. A suspension system according to any one of claims 1 to 4, characterized in that the first conical region (130) and/or the second conical region (230) and/or the third conical region (330) is a standard split cone.

7. A suspension system according to any one of claims 1 to 6, characterized in that the first, second, and third conical regions (130, 230, 330) have a cone angle from approximately 5°

to approximately 20°

.

8. A suspension system according to any one of claims 1 to 7, characterized in that a portion of the second bore (240) at one end (210) of the first rotary shaft of the first magnetic bearing module (200) is tapped to receive the tie-rod (400) and the other end (260) of the first rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel.

9. A suspension system according to any one of claims 1 to 7, characterized in that a portion of the third bore (340) at one end of the second rotary shaft (310) of the second magnetic bearing module (300) is tapped to receive the tie-rod (400) and the other end (360) of the second rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel.

10. A suspension system according to any one of claims 1 to 9, characterized in that, at at least one end, the central rotary shaft (110) of the motor module (100) has a circumferential groove (150) for locating a tool (500) for assembling the motor module (100) and the first and second magnetic bearing modules (200, 300).

11. A suspension system according to any one of claims 1 to 10, characterized in that the tie-rod (400) has at each end a thread (420) adapted to receive a tool (500) for assembling the motor module (100) and the first and second magnetic bearing modules (200, 300).

14. A method of assembling a system according to claim 1 for suspending and rotating a rotary shaft, which method is characterized in that it comprises the steps of:

a) centering a motor module (100) through which passes a tie-rod (400) with respect to first and second magnetic bearing modules (200;

300) with the aid of complementary conical regions (130;

230;

330) at the ends of the motor module (100) and at one end of each of the first and second magnetic bearing modules (200, 300),

b) immobilizing the motor module (100) and exerting on a first end of the tie-rod (400) an external traction force in the direction of the axis OO′

of the motor module (100) so as to bring about conical clamping and to bring into contact annular bearing surfaces (120, 220) at one end of the motor module (100) and at one end of the first magnetic bearing module that co-operates with the other end of the tie-rod (400),

c) maintaining the external traction force and screwing the second, non-clamped magnetic bearing module (300) onto the first end of the tie-rod (400) to bring into contact a conical region (330) of said second module and a conical region (130) of the motor module (100), and

d) eliminating the external traction force so that the motor module (100) and the first and second magnetic bearing modules (200, 300) are assembled firmly with a contact pressure between the annular bearing surfaces (120, 220, 320) applied by an axial tension exerted by the tie-rod (400).

15. A suspension system according to claim 2, characterized in that the first conical regions are concave and clampingly interengage with the second and third conical regions, which are convex.

16. A suspension system according to claim 2, characterized in that at least one first conical region is convex and clampingly interengages with a second or third conical region that is concave.

17. A suspension system according to claim 15, characterized in that:

the first conical region and/or the second conical region and/or the third conical region is a standard solid cone;

the first, second, and third conical regions have a cone angle from approximately 5°

to approximately 20°

;

a portion of the second bore at one end of the first rotary shaft of the first magnetic bearing module is tapped to receive the tie-rod and the other end of the first rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

a portion of the third bore at one end of the second rotary shaft of the second magnetic bearing module is tapped to receive the tie-rod and the other end of the second rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

at at least one end, the central rotary shaft of the motor module has a circumferential groove for locating a tool for assembling the motor module and the first and second magnetic bearing modules;

the tie-rod has at each end a thread adapted to receive a tool for assembling the motor module and the first and second magnetic bearing modules.

18. A suspension system according to claim 16, characterized in that:

the first conical region and/or the second conical region and/or the third conical region is a standard solid cone;

the first, second, and third conical regions have a cone angle from approximately 5°

to approximately 20°

;

a portion of the second bore at one end of the first rotary shaft of the first magnetic bearing module is tapped to receive the tie-rod and the other end of the first rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

a portion of the third bore at one end of the second rotary shaft of the second magnetic bearing module is tapped to receive the tie-rod and the other end of the second rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

at at least one end, the central rotary shaft of the motor module has a circumferential groove for locating a tool for assembling the motor module and the first and second magnetic bearing modules;

the tie-rod has at each end a thread adapted to receive a tool for assembling the motor module and the first and second magnetic bearing modules.

19. A suspension system according to claim 15, characterized in that:

the first conical region and/or the second conical region and/or the third conical region is a standard split cone;

the first, second, and third conical regions have a cone angle from approximately 5°

to approximately 20°

;

a portion of the second bore at one end of the first rotary shaft of the first magnetic bearing module is tapped to receive the tie-rod and the other end of the first rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

a portion of the third bore at one end of the second rotary shaft of the second magnetic bearing module is tapped to receive the tie-rod and the other end of the second rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

at at least one end, the central rotary shaft of the motor module has a circumferential groove for locating a tool for assembling the motor module and the first and second magnetic bearing modules;

the tie-rod has at each end a thread adapted to receive a tool for assembling the motor module and the first and second magnetic bearing modules.

20. A suspension system according to claim 16, characterized in that:

the first conical region and/or the second conical region and/or the third conical region is a standard split cone;

the first, second, and third conical regions have a cone angle from approximately 5°

to approximately 20°

;

a portion of the second bore at one end of the first rotary shaft of the first magnetic bearing module is tapped to receive the tie-rod and the other end of the first rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

a portion of the third bore at one end of the second rotary shaft of the second magnetic bearing module is tapped to receive the tie-rod and the other end of the second rotary shaft is a free end adapted to accommodate means for fixing a functional member such as a wheel;

at at least one end, the central rotary shaft of the motor module has a circumferential groove for locating a tool for assembling the motor module and the first and second magnetic bearing modules;

the tie-rod has at each end a thread adapted to receive a tool for assembling the motor module and the first and second magnetic bearing modules.

12. A magnetic bearing module (200, 300) for a suspension and rotation system and characterized in that it comprises a rotary shaft (210;

310) having an axial bore (240;

340) and, at one end at least, a front annular bearing surface (220;

320) defining a conical region (230;

330) and adapted to be assembled firmly with a complementary end of another rotary shaft (110) by means of a tie-rod (400) screwed into the bore (240;

340) of the rotary shaft (210;

310) of the magnetic bearing module (200;

300).

13. A motor module (100) for a suspension and rotation system and characterized in that it comprises a rotary shaft (110) having an axial bore (140), a front annular bearing surface (120) at each end defining a conical region (130) of the axial bore, and a circumferential groove (150) at one end at least of the rotary shaft (110).