Magnetic bearing, rotary apparatus comprising such a magnetic bearing and method for manufacturing such a magnetic bearing

Patent metadata

Field	Value
Publication number	US-10030702-B2
Application number	US-201514945599-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Nov 27, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A magnetic bearing, adapted to equip a rotary apparatus. The magnetic bearing comprises: an actuator sub-assembly provided with a magnetic base and at least three actuator bobbins mounted on the magnetic base, and a sensor sub-assembly provided with at least three magnetic sensors associated with the actuator bobbins. At least one sub-assembly amidst the actuator sub-assembly and the sensor sub-assembly comprises at least three sectors mounted together. Each sector includes at least one actuator bobbin when the sector belongs to the actuator sub-assembly, or at least one magnetic sensor when the sector belongs to the sensor sub-assembly. The invention also concerns a rotary apparatus comprising such a magnetic bearing and a method for manufacturing such a magnetic bearing.

First claim

What is claimed is:

1. A magnetic bearing, adapted to equip a rotary apparatus, the magnetic bearing comprising:
an actuator sub-assembly provided with a magnetic base and at least three actuator bobbins mounted on the magnetic base, each actuator bobbin of the at least three actuator bobbins comprising a coil circumscribing a hollow central part, the hollow central part having a recess passing therethrough;
the actuator sub-assembly comprises at least three sectors mounted together, each sector comprising at least one actuator horn, and
a sensor sub-assembly provided with at least three magnetic sensors associated with the actuator bobbins,
wherein each actuator bobbin of the at least three actuator bobbins is mounted on the magnetic base by passing the respective actuator horn through the respective recess of the hollow central part,
wherein at least one sub-assembly amidst the actuator sub-assembly and the sensor sub-assembly comprises at least three sectors mounted together,
wherein each sector includes one of:
at least one actuator bobbin when the sector belongs to the actuator sub-assembly, or
at least one magnetic sensor when the sector belongs to the sensor sub-assembly.

2. The magnetic bearing according to claim 1 , wherein the actuator sub-assembly comprises four sectors mounted together,
each sector extending over an angle of 90 degrees around a central axis of the magnetic bearing.

3. The magnetic bearing according to claim 1 , wherein each sector of the actuator sub-assembly comprises two actuator horns made together of a single part and two actuator bobbins mounted on the actuator horns.

4. The magnetic bearing according to claim 1 , wherein each magnetic sensor is positioned at a junction between two sectors of the actuator sub-assembly.

5. The magnetic bearing according to claim 1 , the sensor sub-assembly further comprising at least three sectors mounted together and each comprising at least one magnetic sensor.

6. The magnetic bearing according to claim 1 , the sensor sub-assembly further comprising a base and an intermediate magnetic support which is provided with sensor horns and is fastened between the base and each magnetic sensor received on one of the sensor horns.

7. The magnetic bearing according to claim 6 , the intermediate support further comprising a main portion and two sensor horns forming a fork.

8. The magnetic bearing according to claim 1 , further comprising two sensor sub-assemblies arranged on either side of the actuator sub-assembly.

9. The magnetic bearing according to claim 1 , wherein at least one magnetic system amidst the actuator bobbins and the sensor bobbins comprises together:
a coil holder;
a coil wound up around the coil holder; and
a connector device integrated to the coil holder and designed for plugging at least one wire.

10. The magnetic bearing according to claim 9 , wherein the coil holder supports a single coil.

11. The magnetic bearing according to claim 9 , the coil holder further comprising two lateral portions, each supporting one coil.

12. The magnetic bearing according to claim 9 , wherein the connector device is an insulator displacement connector designed for receiving and automatically restraining at least one wire.

13. The magnetic bearing according to claim 1 , wherein the magnetic bearing is integrated into a rotary apparatus.

14. The magnetic bearing according to claim 13 , wherein the rotary apparatus is one of:
a flywheel, a turbo molecular pump, a turbo expander, a turbo compressor, an air blower, a spindle or a chiller.

15. A method for manufacturing a magnetic bearing, the magnetic bearing comprising:
an actuator sub-assembly provided with a magnetic base and at least three actuator bobbins mounted on the magnetic base, each actuator bobbin of the at least three actuator bobbins comprising a coil circumscribing a hollow central part, the hollow central part having a recess passing therethrough;
the actuator sub-assembly comprises at least three sectors mounted together, each sector comprising at least one actuator horn, and
a sensor sub-assembly provided with at least three magnetic sensors associated with the actuator bobbins,
wherein each actuator bobbin of the at least three actuator bobbins is mounted on the magnetic base by passing the respective actuator horn through the respective recess of the hollow central part,
wherein at least one sub-assembly amidst the actuator sub-assembly and the sensor sub-assembly comprises at least three sectors mounted together,
wherein each sector includes one of:
at least one actuator bobbin when the sector belongs to the actuator sub-assembly, or
at least one magnetic sensor when the sector belongs to the sensor sub-assembly,

the method comprising steps of:
a) manufacturing the actuator sub-assembly, including a step of sliding each actuator bobbin onto the magnetic base by passing the respective actuator horn through the respective recess of the hollow central part;
b) manufacturing the sensor sub-assembly; and
c) assembling the actuator sub-assembly and the sensor sub-assembly to form the magnetic bearing;

wherein at least one of during step a) and during step b), at least three sectors are provided to form the actuator sub-assembly or the sensor sub-assembly, each sector including one of:
at least one magnetic actuator bobbin when the sector belongs to the actuator sub-assembly, or
at least one magnetic sensor bobbin when the sector belongs to the sensor sub-assembly.

Assignees

• Bauce Yvon
• Bienaime Francis
• Carrasco Eduardo
• Skf Magnetic Mechatronics

Inventors

• Baucé Yvon
• Bienaime Francis
• Carrasco Eduardo

Classifications

• H01F7/06

  Electromagnets; Actuators including electromagnets {(electric coils H01F5/00; devices for holding workpieces using electric force B23Q3/15; load-engaging elements for lifting articles electromagnetically B66C1/06; electromagnetic couplings F16D27/00; magnetic brakes F16D63/002; electromagnetically operated valves F16K11/24, F16K31/00; analysing materials by magnetic means G01N27/72, G01N27/80; electromagnets for winding mechanical clocks G04C1/02; electromagnetic relays H01H51/00; windings for salient poles of dynamo-electric machines H02K3/18; electromagnets for telegraphic communication H04L; for arc lamps H05B31/28)} · CPC title

• F16C32/0446

  Determination of the actual position of the moving member, e.g. details of sensors · CPC title

• F16C32/0461

  of stationary parts of the magnetic circuit · CPC title

• F16C2360/45

  Turbo-molecular pumps · CPC title

• F16C32/048 Primary

  with active support of two degrees of freedom, e.g. radial magnetic bearings · CPC title